The document outlines 15 steps for mold design and focuses on design considerations. It discusses analyzing product drawings, determining the injection machine type and number of cavities, selecting the parting surface, designing the gating system, ejection system, cooling system, and other elements. Key points include choosing an appropriate parting surface, layout of the flow channel and gate, ejection device, water distribution, exhaust, draft angles, and simplifying the mold structure as much as possible.
WHAT IS PLASTIC?
A synthetic material made from a wide range of organic polymers such as polyethylene, PVC, nylon, etc., that can be molded into shape while soft, and then set into a rigid or slightly elastic form.
WHAT IS PLASTIC?
A synthetic material made from a wide range of organic polymers such as polyethylene, PVC, nylon, etc., that can be molded into shape while soft, and then set into a rigid or slightly elastic form.
This presentation includes basics of mold design, important aspects of molds and mold design that will be useful for understanding design, material aspects, and theoretical aspects of mold making and mold engineering. ProE mold design module known as Pro/MOLDESIGN is also briefly explained in the slide.
Production Technology Lecture Notes as per GGSIPU SYLLABUS FOR UNIT 1.
Casting is a process in which molten metal is allowed to solidify in a predefined mould cavity. After the solidification by breaking the mould the component is taken out. This is known as CASTING.
Pattern is a replica of a object to be made with some modifications.
Pattern Materials
Difference between Pattern and Casting
Types of Patterns
Pattern Design Considerations
Pattern Allowances
Pattern Making
Pattern Layout
Properties of moulding sand
Testing of Moulding Sand
Special casting process
Case study of injection molding defects-Automotive Molding. Pls visit www.gudmould.com or www.gudmould.wordpress.com for more. Mail us to jackie@gudmould.com.
DESIGN OF MOULD TOOL & COOLING CHANNEL OPTIMIZATION OF REMOTE CONTROL TOP PANELIjripublishers Ijri
A plastic material is any of a wide range of synthetic or semi-synthetic organic solids that are moldable. Plastics are
typically organic polymers of high molecular mass, but they often contain other substances. They are usually synthetic,
most commonly derived from petrochemicals, but many are partially natural.
Molding is the process of manufacturing by shaping liquid or pliable raw material using a rigid frame called a mold or
matrix. This itself may have been made using a pattern or model of the final object.
Cooling channels are used in mold tool to reduce the temperature of the object to help molten material to solidify quickly
before the ejection. It is quite useful to increase the production rate.
DESIGN OF MOULD TOOL & COOLING CHANNEL OPTIMIZATION OF REMOTE CONTROL TOP PANELIjripublishers Ijri
A plastic material is any of a wide range of synthetic or semi-synthetic organic solids that are moldable. Plastics are
typically organic polymers of high molecular mass, but they often contain other substances. They are usually synthetic,
most commonly derived from petrochemicals, but many are partially natural.
Molding is the process of manufacturing by shaping liquid or pliable raw material using a rigid frame called a mold or
matrix. This itself may have been made using a pattern or model of the final object.
Cooling channels are used in mold tool to reduce the temperature of the object to help molten material to solidify quickly
before the ejection. It is quite useful to increase the production rate.
The aim of this project work is to design mold structure and optimize cooling channel system to reduce effect of warpage
of remote control top panel.
This presentation includes basics of mold design, important aspects of molds and mold design that will be useful for understanding design, material aspects, and theoretical aspects of mold making and mold engineering. ProE mold design module known as Pro/MOLDESIGN is also briefly explained in the slide.
Production Technology Lecture Notes as per GGSIPU SYLLABUS FOR UNIT 1.
Casting is a process in which molten metal is allowed to solidify in a predefined mould cavity. After the solidification by breaking the mould the component is taken out. This is known as CASTING.
Pattern is a replica of a object to be made with some modifications.
Pattern Materials
Difference between Pattern and Casting
Types of Patterns
Pattern Design Considerations
Pattern Allowances
Pattern Making
Pattern Layout
Properties of moulding sand
Testing of Moulding Sand
Special casting process
Case study of injection molding defects-Automotive Molding. Pls visit www.gudmould.com or www.gudmould.wordpress.com for more. Mail us to jackie@gudmould.com.
DESIGN OF MOULD TOOL & COOLING CHANNEL OPTIMIZATION OF REMOTE CONTROL TOP PANELIjripublishers Ijri
A plastic material is any of a wide range of synthetic or semi-synthetic organic solids that are moldable. Plastics are
typically organic polymers of high molecular mass, but they often contain other substances. They are usually synthetic,
most commonly derived from petrochemicals, but many are partially natural.
Molding is the process of manufacturing by shaping liquid or pliable raw material using a rigid frame called a mold or
matrix. This itself may have been made using a pattern or model of the final object.
Cooling channels are used in mold tool to reduce the temperature of the object to help molten material to solidify quickly
before the ejection. It is quite useful to increase the production rate.
DESIGN OF MOULD TOOL & COOLING CHANNEL OPTIMIZATION OF REMOTE CONTROL TOP PANELIjripublishers Ijri
A plastic material is any of a wide range of synthetic or semi-synthetic organic solids that are moldable. Plastics are
typically organic polymers of high molecular mass, but they often contain other substances. They are usually synthetic,
most commonly derived from petrochemicals, but many are partially natural.
Molding is the process of manufacturing by shaping liquid or pliable raw material using a rigid frame called a mold or
matrix. This itself may have been made using a pattern or model of the final object.
Cooling channels are used in mold tool to reduce the temperature of the object to help molten material to solidify quickly
before the ejection. It is quite useful to increase the production rate.
The aim of this project work is to design mold structure and optimize cooling channel system to reduce effect of warpage
of remote control top panel.
Conceptual design of injection mold tool for the chair hand rest componenteSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
Reasonable product design and mold design are key technologies that affect the success of injection molding. This article introduces some basic principles of injection molded product design and mold design.
1. The basic conditions of plastic product design
1.1. Record the product usage conditions as detailed as possible.
These conditions are:
A. Use environment
Outdoor conditions (sunlight, rain, ice, snow, dust), sunlight (ultraviolet rays, radiation, etc.), contact with gas (corrosive gas, water vapor), contact with liquid (water, detergent, oil, medicine, etc.), other (plasticizers), copper);
B. Use intensity
Common temperature, maximum temperature, minimum temperature (usually, special circumstances, outdoor, warehouse, window, car, etc.), repeated cold and hot
C. Use load
Common load, maximum load (normal, special circumstances. Static, dynamic, repeated, continuous, impact, drop, etc.).
A Design and Analysis of Two Plate Injection Mould Tool For Wi-Fi RouterTherm...EditorJST
This A Wi-Fi router is a device that performs the function of a wireless access point, it is used to provide
access to the internet or a private computer. It is the hardware device that provide basic infrastructure for a home
or small office network.Proposed to make a single impression semi-automatic family mould to design top and
bottom cover for Wi-Fi router to make it more aesthetic, to reduce material cost, better heat dissipation, and to
reduce the tooling cost, to make the product more competitive in the market.It is proposed select the suitable plastic
material, to modify the existing plastic product design and to develop a suitable two plate family mould of one
impression each using SIEMENS NX software. It is also proposed to make detailing of mould parts and its assembly
for manufacturing using SIEMENS NX software. The analysis was done in AUTODESK MOLDFLOW. The mould
cost, raw material cost and processing cost per component are to be estimated to find the cost per component and to
compare it with the existing component part.
In machining fixtures, minimizing workpiece deformation due to clamping and cutting forces is essential
to maintain the machining accuracy. The various methodology used for clamping operation used in different application
by various authors are reviewed in this paper. Fixture is required in various industries according to their application. This can be
achieved by selecting the optimal location of fixturing elements such as locators and clamps. The fixture set up for component is done
manually. For that more cycle time required for loading and unloading the material. So, there is need to develop system which can
help in improving productivity and time. Fixtures reduce operation time and increases productivity and high quality of operation is
possible.
Demystifying Designing for ‘X’ by ProTek Medical ProtekMedical
http://www.protek.ie/
Annette Carty-Mole B.Eng (Hons)
Design Engineer, ProTek Medical
When a company is given the task of designing a
new product or redesigning an existing product, it
is important to keep in mind the three main goals
of cost, quality and speed. These goals can be
further split into more quantitative criteria which
are relevant throughout the product’s life cycle.
Designing for manufacture and assembly are typical
examples of two criteria which will have a large
impact on the cost, quality and speed at which the
product is developed. The methodology of design
that meets an all-encompassing range of criteria is
known as designing for ‘X’.
6 points about ejector pins help your injection molding work increase 50%!JasmineHL
What is the function of the ejector pin?
Ejector pins help safely remove parts from molds after they have been made. Here are some tips on how to properly locate and use those pins. Ejector pins are the “bouncers” of the injection molding world. They let technicians apply a force to eject a part from the mold, and, in some cases, can leave marks.
Engineering Guidelines to Designing Plastic Parts for Injection MoldingJaycon Systems
At Jaycon Systems, we have chosen to use injection molding as the main manufacturing process to bring plastic products to life.
However, injection molding is not simple. Engaging in such process requires an extensive knowledge about its machinery and process.
In this presentation, we will show you some of the aspects we take into consideration when designing plastic parts for injection molding so we can save our customers time and money in the long run.
A Review on Design of a Fixture for Rear Coverijsrd.com
In fixtures which are used for machining process, minimizing work piece deformation due to clamping and cutting forces is necessary due to which machining accuracy can be maintained. The different methodologies used for clamping operation in different application by various authors are discussed in this paper. Fixtures are required in different industries according to specific application. Rear Cover is important part in agriculture tractor. The fixture set up for Rear Cover is done manually, which leads to machining defects, poor quality, increase in rejection rate, more cycle time and more hectic to operator. So, there is need to develop system which can help in achieve quality, increase productivity, elimination of human error, reduction in cycle time.
Complex structure of molded plastic part needs to design a special demoulding mechanism. Requirements of these demoulding mechanisms are to not only make molded plastic part demould smoothly, but also make demoulding action reliable, and mold structure should be simplified as much as possible. When determining parting surface of a molded plastic part, parting surface that can simplify mold structure and allow plastic part to be demolded should be selected first. For tube position structure of three different demoulding directions on breast shield shown in Figure 1, one of them is an internal thread cap, bottom of internal thread cap has a round tube and a small hole, and its demoulding structure complex. In order to simplify mold structure for forming plastic part, selected main parting surface is located in the middle of three pipe positions on plastic part, and all three pipe positions are demoulded by side core pulling mechanism.
Plastic parts are structural designs based on industrial modeling. First, check whether there are similar products for reference, then perform a detailed functional decomposition of products and parts to determine splitting, wall thickness, demoulding slope, and gap between parts. Main process issues such as transition treatment, connection treatment, and strength treatment of parts.
Figure 1 shows interior trim panel of left front door of a certain model. This door panel adopts an integrated structure. Trim panel and horn grille are integrated on door panel interior panel, and horn grille is honeycomb-shaped. Door panel interior panel material is PP-T20, the overall dimensions are 885mm*718mm*122mm, main body wall thickness is 2.2mm, and weight is 1780g.
Molten thermoplastics exhibit viscoelastic behavior, a combination of flow properties of viscous fluids and elastic solids. When a viscous fluid flows, part of driving energy is converted into viscous heat and disappears; however, when an elastic solid deforms, energy that drives deformation is stored. In daily life, flow of water is a typical viscous fluid, and deformation of rubber is an elastic body.
In addition to these two material flow behaviors, there are also two flow deformations, shear and extension, as shown in Figure 4-1 (a) and (b). In filling stage of injection molding, flow of thermoplastic melt is dominated by shear flow, as shown in Figure 4-1(c), and there is relative sliding between elements of each layer of material. In addition, when melt flows through a region of sudden size change, as shown in Figure 4-1(d), extensional flow becomes much more important.
Foreign engineering plastics industry started earlier. In 1931, DuPont Company of United States synthesized PA66 for the first time in laboratory. In 1939, PA66 realized industrialization and was the first industrialized engineering plastic. From 1950 to 1980, it was a period of rapid development of global engineering plastics industry. Bayer of Germany, DuPont of United States, and Qiqi of United States successively developed engineering plastics such as polycarbonate (PC), polyoxymethylene (POM), and polyimide (PI).
Abstract A 2-cavity two-plate mold was designed for injection molding of plastic parts of 135° elbow pipe of injection molding machine. Mold uses 4 types of demolding mechanisms for demolding of molded plastic parts, including bend pipe, straight pipe, retractable, push rod ejection and other demoulding mechanisms. Elbow core pulling mechanism uses a rack to drive sector gear, then arc slider is driven to perform rotary core pulling; straight tube core pulling mechanism uses a hydraulic cylinder to drive inner and outer wall cores to perform 2 core pulling; inner core pulling mechanism uses T-slots locking block to drive inner retractable core pulling; plastic part is finally pushed out by push rod.
Presentation of Gud Mould Industry Limited- Plastic Injection Mould and Die Casting Mould Manufacturer in China. Know more, please visit www.gudmould.com.
Gating system is one of five major systems in the design of plastic molds. Its design will affect product ranking, number of mold cavities, form of mold structure, choice of injection moulding machine size, level of injection molding costs, level of mold manufacturing costs, difficulty of mold manufacturing, pressure, post-processing methods and costs during manufacturing. Slight effects will cause product to appear burrs, shrinkage, deformation, air lines, pinching, trapped air, easy to crack, difficult to cut, difficult to repair, difficult to take, difficult to take, etc .; serious effects will make product unable to produce, unfilling injection, obvious and severe clamping, product burnt, damage to appearance, bending of mold core, dragging product to scrap, unable to perform post-processing, unable to package, unable to distinguish left and right, etc.
Hot runner nozzle is one of important components of hot runner system. It is very important to control temperature of hot runner nozzle in injection mold. If temperature at the gate is too high, melt will stick to valve needle when mold is opened. If temperature at the gate is too low, melt at the gate will be too cold, which will make valve needle difficult to close.
ABS (acrylonitrile-butadiene-styrene copolymer)
ABS
1. Select appropriate sprue and gate according to fluidity.
2. Select appropriate fusion state for gate location.
3. Due to high pressure forming, retraction inclination must be above 2°.
4. Shrinkage in plastic injection molding must be around 0.5%.
5. Commonly used for gold-plated products, following matters are as follows:
In order for metal workpiece to have required working properties, a heat treatment process is often necessary. Heat treatment process generally includes three processes of heating, heat preservation and cooling. It is divided into quenching, tempering, normalizing, annealing, etc. depending on process. Can you distinguish it?
Compared with ordinary flow channel molds, hot runner mould have significant advantages such as saving time and materials, high efficiency, and stable quality. However, its wide application has been affected by their failure in use. With technological advancement of mold industry, hot runner mould has made great progress in flow channel melt temperature control, structural reliability, hot runner component design and manufacture, which makes hot runner technology regain people’s attention and favor.
36 common plastic raw materials molding temperature that you must know 1. Select appropriate sprue and gate according to fluidity. 2. Select appropriate fusion state for gate location. 3. Due to high pressure forming, retraction inclination must be above 2°. 4. Shrinkage in plastic injection molding must be around 0.5%. 5. Commonly used for gold-plated products, following matters are as follows:
Gas mark is a quality defect that is easy to produce and difficult to eliminate. Gas mark not only affects appearance of product, but also affects strength of product. Relevant domestic technical data does not involve much of mechanism of generating gas mark. When operator encounters specific problems, he cannot quickly find cause of problem. He do not know what process measures to take, problem cannot be solved in time, resulting in a large amount of waste of resources which will cause huge losses to enterprise.
A tale of scale & speed: How the US Navy is enabling software delivery from l...sonjaschweigert1
Rapid and secure feature delivery is a goal across every application team and every branch of the DoD. The Navy’s DevSecOps platform, Party Barge, has achieved:
- Reduction in onboarding time from 5 weeks to 1 day
- Improved developer experience and productivity through actionable findings and reduction of false positives
- Maintenance of superior security standards and inherent policy enforcement with Authorization to Operate (ATO)
Development teams can ship efficiently and ensure applications are cyber ready for Navy Authorizing Officials (AOs). In this webinar, Sigma Defense and Anchore will give attendees a look behind the scenes and demo secure pipeline automation and security artifacts that speed up application ATO and time to production.
We will cover:
- How to remove silos in DevSecOps
- How to build efficient development pipeline roles and component templates
- How to deliver security artifacts that matter for ATO’s (SBOMs, vulnerability reports, and policy evidence)
- How to streamline operations with automated policy checks on container images
DevOps and Testing slides at DASA ConnectKari Kakkonen
My and Rik Marselis slides at 30.5.2024 DASA Connect conference. We discuss about what is testing, then what is agile testing and finally what is Testing in DevOps. Finally we had lovely workshop with the participants trying to find out different ways to think about quality and testing in different parts of the DevOps infinity loop.
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. What’s changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
Securing your Kubernetes cluster_ a step-by-step guide to success !KatiaHIMEUR1
Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
The Art of the Pitch: WordPress Relationships and SalesLaura Byrne
Clients don’t know what they don’t know. What web solutions are right for them? How does WordPress come into the picture? How do you make sure you understand scope and timeline? What do you do if sometime changes?
All these questions and more will be explored as we talk about matching clients’ needs with what your agency offers without pulling teeth or pulling your hair out. Practical tips, and strategies for successful relationship building that leads to closing the deal.
Encryption in Microsoft 365 - ExpertsLive Netherlands 2024Albert Hoitingh
In this session I delve into the encryption technology used in Microsoft 365 and Microsoft Purview. Including the concepts of Customer Key and Double Key Encryption.
UiPath Test Automation using UiPath Test Suite series, part 3DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 3. In this session, we will cover desktop automation along with UI automation.
Topics covered:
UI automation Introduction,
UI automation Sample
Desktop automation flow
Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
Accelerate your Kubernetes clusters with Varnish Caching
Sixteen steps of mold design and design focus
1. Fifteen steps of molding design and design focus
A mold is an industrial product that shapes a material by a certain structure in a specific structure,
and is also a production tool capable of mass-producing industrial product parts having a certain
shape and size requirement. Large to airplanes, cars, small cups, nails, almost all industrial
products must rely on molding. High precision, high consistency, and high productivity of parts
produced by mold are unmatched by any other processing method. Molds largely determine
quality, efficiency and new product development capabilities of product. Therefore, mold has
honorary title of “Mother of Industry”.
Mold designer refers to personnel who are engaged in digital design of enterprise molds,
including cavity molds and cold stamping molds, and fully applied digital design tools to improve
molding design quality and shorten molding design cycle on the basis of traditional molding
design. Mold designer can be employed in the fields of CNC programming, mold 3D design, and
product development 3D design.
Step 1: Analysis and digestion of 2D/3D drawing of product, content
includes following aspects:
1. Geometry of product.
2, Size, tolerance and design basis of product.
3. Technical requirements of product (ie technical conditions).
4. Name, shrinkage and color of plastic used in product.
5. Surface requirements of product.
2. Step 2: Determination of injection machine type
Specification of injection is mainly determined by size and production volume of plastic product.
When designing injection machine, designer mainly considers plasticizing rate, injection volume,
clamping force, effective area of mounting mold (spacing inside injection rod), modulus, top
ejection form and determined length. If customer has provided type or specification of injectable
use, designer must check parameters and if it does not meet requirements, it must be consulted
with customer.
Step 3: Determination of number and layout of cavities
Determination of number of mold cavity is mainly determined by projected area of product,
geometry (with or without side cores), accuracy of product, batch size, and economic benefits.
Number of mold cavity is determined mainly by following factors:
1. Production batch of products (monthly batch or annual batch).
2. Whether product has side core and its treatment method.
3. Outer dimensions of mold and effective area of injection molding (or spacing inside injection
rod).
4. Weight of product and injection volume of injection machine.
5. Projected area and clamping force of product.
6, Product accuracy.
7, Product color.
8. Economic benefits (production value of each set of molds).
These factors are sometimes mutually constrained, so when designing a design, coordination
must be made to ensure that main conditions are met.
After number of cavities is determined, arrangement of cavities and layout of cavity positions are
performed. Arrangement of cavities involves size of mold, design of gating system, balance of
gating system, design of core (slider) mechanism, design of insert core, and design of hot runner
system. These problems are related to selection of parting surface and gate position, so in
specific design process, necessary adjustments must be made to achieve most perfect design.
3. Step 4: Determination of parting surface
Parting surface has been specified in some foreign product drawings, but in many molding design,
it is determined by mold personnel. Generally speaking, parting surface on the plane is easier to
handle. Sometimes you should pay special attention to three-dimensional parting surface.
Selection of parting surface should follow following principles:
1, Does not affect appearance of product, especially for products with clear requirements on
appearance, should pay attention to impact of shape on the appearance.
2, To ensure accuracy of product.
3, Conducive to molding process, especially processing of cavity.
4. Conducive to design of gating system, exhaust system and cooling system.
5. It is beneficial to demoulding product to ensure that product is left on movable mold side
when mold is opened.
6, Easy to metal inserts.
When designing lateral parting mechanism, it should be ensured that it is safe and reliable, avoid
interference with fixed mechanism as much as possible. Otherwise, a pre-recovery mechanism
should be set on mold.
4. Step 5: Determination of mold base and selection of standard parts
After all above contents are determined, mold base is designed according to specified content.
When designing formwork, use standard formwork as much as possible to determine form,
specifications and thickness of A/B plates of standard formwork. Standard parts include two
types: common standard parts and standard parts for molds. General standard parts such as
fasteners. Standard parts for molds such as positioning ring, sprue bushing, push rod, push tube,
guide post, guide sleeve, mold-specific spring, cooling and heating element, secondary parting
mechanism and standard components for precision positioning.
It should be emphasized that when designing molds, standard mold base and standard parts are
used as much as possible, because a large part of standard parts have been commercialized and
can be purchased at any time, which is extremely advantageous for shortening manufacturing
cycle and reducing manufacturing cost.
After buyer has been sized, necessary strength and rigidity calculations are performed on
mold-related parts to check that selected formwork is appropriate, especially for large molds.
Step 6: Design of gating system
Design of gating system includes selection of main flow path, shape of cross-section of runner,
and determination of dimensions.
If a point gate is used, in order to ensure separation of runner, attention should also be paid to
design of degasser.
In designing gating system, first is to choose location of gate. Appropriate choice of location of
gate will directly affect quality of product and smoothness of injection process. Choice of gate
location should follow following principles:
1. Position of gate should be selected on parting surface as much as possible to facilitate
processing of mold and cleaning of gate.
2. Distance between gate location and various parts of cavity should be as uniform as possible,
and process should be the shortest (it is difficult to do with a large nozzle).
3. Position of gate should ensure that plastic is injected into cavity against spacious and
thick-walled part of cavity to facilitate inflow of plastic.
5. 4. Avoid plastics from penetrating into cavity wall, core or insert when flowing into cavity, so that
plastics can flow into all parts of cavity as soon as possible to avoid deformation of core or insert.
5, Try to avoid production of weld lines. If it is to be produced, make dissolution marks appear in
places where product is not important.
6. Position of gate and direction of plastic injection should be, plastic can flow uniformly along
parallel direction of cavity when injecting into cavity, and it is beneficial to discharge of gas in
cavity.
7. Gate should be designed to be the easiest part to remove on product, while not affecting
appearance of product as much as possible.
Step 7: Design of ejection system
Ejector form of product can be divided into three categories: mechanical ejection, hydraulic
ejection, and pneumatic ejection.
Mechanical ejection is the last link in injection molding process. Quality of ejection will
ultimately determine quality of product. Therefore, product ejection cannot be ignored.
Following principles should be observed when designing an ejector system:
1. In order to prevent product from being deformed due to ejection, thrust point should be as
close as possible to core or part that is difficult to demould. For example, elongated hollow
cylinder on product is mostly pushed out by a push tube. Arrangement of thrust points should be
as balanced as possible.
2. Thrust point should be applied to part where product can withstand the most stress and part
with good rigidity, such as rib, flange, wall edge of shell type product, etc.
3, Try to avoid thrust point on thinner surface of product, to prevent product from whitening, top
height, etc., such as shell-shaped products and cylindrical products are mostly pushed out by
push plates.
4, Try to avoid appearance of product, ejection device should be placed on hidden or
non-decorative surface of product. In particular, attention should be paid to choice of position
and ejection form for transparent articles.
5. In order to make product evenly stressed when it is ejected, and avoid deformation of product
6. due to vacuum adsorption, a composite ejection or special form of ejector system, such as push
rod, push plate or push rod, push tube composite, is often used. To eject, or use air intake push
rod, push block, etc. If necessary, an intake valve should also be provided.
Step 8: Design of cooling system
Design of cooling system is a cumbersome task, considering cooling effect, uniformity of cooling
and effect of cooling system on overall structure of mold. Design of cooling system includes
following:
1. Arrangement and specific form of cooling system.
2. Determination of specific location and size of cooling system.
3. Key parts are the cooling of the dynamic model core or insert.
4. Cooling of side slider and side slide core.
5. Design of cooling components and selection of cooling standard components.
6. Design of sealing structure.
7. Layout of Cavity Cooling System
Layout of Core Cooling System
Step 9: Design of guide device
Guides on plastic injection mold have been determined using standard mold base. Under normal
circumstances, designer only needs to select according to mold base specifications. However,
when a precision guide is required according to requirements of product, it must be designed by
designer according to mold structure.
General orientation is divided into: orientation between moving and fixed molds; guiding of push
plate and push rod fixing plate; guiding between pushing plate and moving plate; guiding
between fixed die seat and push pirated version. Generally, guiding device is limited by
processing precision or after a period of use, precision of matching is lowered, which directly
affects precision of product. Therefore, precision positioning component must be separately
designed for product with high precision. Some have been standardized, such as tapered
positioning pins, positioning blocks, etc., but some precision guiding and positioning devices
must be specially designed according to specific structure of module.
Step 10: Selection of mold steel
Selection of materials for mold forming parts (cavities, cores) is mainly determined according to
batch size and plastic type of products. For products with high gloss or transparency, martensitic
corrosion resistant stainless steel or age hardened steel of type 4Cr13 is mainly used.
For plastic products containing glass fiber reinforced, quenched steel with high wear resistance
such as Cr12MoV should be used.
When material of product is PVC, POM or contains a flame retardant, corrosion resistant stainless
steel must be used.
Step 11: Drawing fit chart
After aligning formwork and related content is determined, assembly drawing can be drawn. In
process of assembly drawing, further coordination and improvement of selected gating system,
cooling system, core pulling system, ejector system, to achieve a more perfect design from
structure.
8. Step 12: Drawing of mold main part
When design a cavity or core drawing, necessary molding dimensions, tolerances, and draft
angles are coordinated, and design basis is coordinated with design basis of product. At the same
time, it is also necessary to consider processability of cavity and core during processing,
mechanical properties and reliability during use.
When design a structural part drawing, when a standard formwork is used, most of structural
parts other than standard formwork may not be drawn.
Step 13: Proofreading of design drawings
After mold drawing design is completed, mold designer will submit design drawings and related
original materials to supervisor for proofreading.
Proofreading personnel shall systematically proofread overall structure, working principle and
feasibility of mold according to relevant design basis and requirements provided by customer.
Step 14: Designing drawing
Once mold design drawings are completed, they must be submitted to customer for approval.
Only after customer agrees, mold can be put into production. When a customer has a large
opinion that requires major changes, it must be re-designed and then handed over to customer
for approval until customer is satisfied.
Step 15: Designing exhaust system
Exhaust system plays a vital role in ensuring quality of product. Exhaust methods are as follows:
1. Use exhaust slot. Venting groove is generally located at portion where cavity is finally filled.
Depth of venting groove varies from plastic and is essentially determined by maximum clearance
allowed when plastic does not create a flash.
2. Use matching clearance of core, insert, push rod, or special exhaust plug to exhaust.
3, Sometimes in order to prevent vacuum deformation of product in the top, it is necessary to
design exhaust insert.
Conclusion
9. Combine above molding design procedures, some of which can be considered together, and
some content should be considered repeatedly. Because factors are often contradictory, they
must be continuously demonstrated and coordinated in design process to get better treatment.
In particular, content related to mold structure must be taken seriously, and often several
solutions should be considered at the same time. For each structure, list advantages and
disadvantages of each aspect as much as possible, and analyzes them one by one to optimize.
Structural reasons will directly affect manufacture and use of mold, serious consequences will
even cause entire mold to be scrapped. Therefore, molding design is a key step to ensure quality
of mold, and its design process is a systematic project.
Key points in mold design:
1. Reasonable overall layout of mold.
2, Choice of parting surface
3, Layout of flow channel, selection of gate
4, Ejection device
5, Water distribution
6, Choice of exhaust
7. Pay attention to draft angle when mold is divided, extraction of insert, treatment of rubbing
angle, and shrinkage of material.
8, Processing drawing should be detailed, but simple.
How do we simplify mold structure to the greatest extent possible?
On one hand, when reviewing products with customers, it is necessary to highlight problems of
mold release brought by product to mold opening, whether to improve products: on other hand,
whether meeting is held in the company before mold design, soliciting various feasible structural
proposals to determine final plan from perspective of customer requirements.
1. Feasibility analysis of products of designed molds. Taking computer case as an example, firstly,
assembly drawings of each component are analyzed by design software, that is, set of drawings
mentioned in the work to ensure correctness of drawings of each product before molding design.
On other hand, you can familiarize yourself with importance of each component in whole chassis
to determine key size, which is very beneficial in mold design.
2. After product analysis, analyze product using mold structure, carry out process of product,
10. determine content of each process, and use design software to carry out product development.
When product is launched, it generally starts from subsequent project, for example, a product
requires five processes, stamping is completed from product drawing to fourth, third, second,
and first projects, a graphic is copied and then previous project is executed. That is, product of
five projects is completed, and then detailed work is carried out. Note that this step is very
important and needs to be very careful. If this step is completed well, it will save a lot of time in
drawing mold diagram. After stamping content of each project is determined, including in the
forming mold, inner and outer lines of thickness of product material are retained to determine
size of convex and concave molds.
3. Prepare materials. According to product development drawing, determine size of template in
drawings, including fixed plates, unloading plates, convex and concave molds, inserts, etc., pay
attention to preparation directly in product development drawing, which is of great benefit to
drawing of mold drawing. I have seen some mold designer directly calculate product drawing to
prepare material. This method is too inefficient, draw template size directly on the drawing, and
express it in form of a group diagram. In terms of preparation of materials, on other hand, a lot of
work is saved in work of various parts of mold, because in work of drawing each component, it is
only necessary to add positioning, pins, guide posts and screw holes in preparation drawing.
4. After preparation is completed, mold drawing can be fully entered, and a copy can be made in
preparation drawing to draw components, such as adding screw holes, guide post holes,
positioning holes, etc. And in punching die. Hole for each hole needs to be cut by wire. In forming
die, forming gap of upper and lower molds must not be forgotten, so mold drawing of one
product after completion of these work is almost completed 80%, In addition, in process of
designing mold drawing, it is necessary to pay attention to: each process, refers to production,
such as fitter scribing, wire cutting, etc. to different processing steps have a complete production
of layer, which has great benefits for wire cutting and drawing management, such as color
distinction, etc. Dimensional marking is also a very important job, and it is also the most
troublesome job, because it is too time consuming.
5. After above drawings are completed, drawings cannot be issued. It is also necessary to
proofread mold drawings, assemble all accessories, make different layers for each different mold
plate, and use same basis as guide post holes to perform mold. Insert product development
drawings into group diagrams to ensure that hole positions of template are consistent and gap
between upper and lower molds of bending position is correct.