This document summarizes design for assembly (DFA) principles presented in a lecture. It discusses DFA and design for manufacturing (DFM), key DFA rules like minimizing part count and using self-locating features, guidelines for part handling, insertion, and fastening. Effects of part characteristics like size, symmetry and accessibility on assembly time are described. The document also discusses analyzing assembly efficiency and identifying opportunities to reduce secondary operations. Different manual assembly methods for small, modular and large assemblies are covered.
A major cost factor in the production of and component or assembly is its assembly. This section looks at some commonly used techniques which a designer can employ to ensure that assembly is cost effective and efficient. This is then linked to the use of jigs and fixtures for this purpose.
Fixture is a work holding and support device used in the manufacturing industry.
In this slide all the details of Fixture is given and one problem statement is also given to manufacture a Fixture.
This ppt describes Profile & Runout CONTROLS in GD&T. It also showcase the differences & similarities between the two controls. Kindly suggest your comments as required. Thank you + Regards.
Computer – Aided process planning (CAPP),What is process planning ,Difficulties in traditional process planning, approaches to CAPP ,Machinability data systems, Database systems, Benefits of CAPP.
Thread fastener, Computer Aided Machine Drawing (CAMD) of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.
Basic types of screw fasteners, Bolts of uniform
strength, I.S.O. Metric screw threads, Bolts under
tension, eccentrically loaded bolted joint in shear,
Eccentric load perpendicular and parallel to axis of
bolt, Eccentric load on circular base, design of Turn
Buckle.
A major cost factor in the production of and component or assembly is its assembly. This section looks at some commonly used techniques which a designer can employ to ensure that assembly is cost effective and efficient. This is then linked to the use of jigs and fixtures for this purpose.
Fixture is a work holding and support device used in the manufacturing industry.
In this slide all the details of Fixture is given and one problem statement is also given to manufacture a Fixture.
This ppt describes Profile & Runout CONTROLS in GD&T. It also showcase the differences & similarities between the two controls. Kindly suggest your comments as required. Thank you + Regards.
Computer – Aided process planning (CAPP),What is process planning ,Difficulties in traditional process planning, approaches to CAPP ,Machinability data systems, Database systems, Benefits of CAPP.
Thread fastener, Computer Aided Machine Drawing (CAMD) of VTU Syllabus prepared by Hareesha N Gowda, Asst. Prof, Dayananda Sagar College of Engg, Blore. Please write to hareeshang@gmail.com for suggestions and criticisms.
Basic types of screw fasteners, Bolts of uniform
strength, I.S.O. Metric screw threads, Bolts under
tension, eccentrically loaded bolted joint in shear,
Eccentric load perpendicular and parallel to axis of
bolt, Eccentric load on circular base, design of Turn
Buckle.
Design for x : Design for Manufacturing,Design for Assembly Naseel Ibnu Azeez
Concurrent engineering is a contemporary approach to DFSS. DFX techniques are part of detail design and are ideal approaches to improve life-cycle cost, quality, increased design flexibility, and increased efficiency and productivity using the concurrent design concepts (Maskell 1991). Benefits are usually pinned as competitiveness measures, improved decision-making, and enhanced operational efficiency. The letter “X” in DFX is made up of two parts: life-cycle processes x and performance measure
DESIGN FOR MANUFACTURING AND ASSEMBLY.A really good insight of DFA and DFM. Also includes a very precise and appealing caste study on aimplemention of DFMA on a motor drive assembly.
Purpose Statement:
To provide an overview of Design for Manufacturing and Assembly (DFMA) techniques, which are used to minimize product cost through design and process improvements.
Addis Ababa City Administration Technical, Vocational, Education And Training...Haileyesus Wondwossen
Addis Ababa City Administration
Technical, Vocational, Education, And Training Agency
Bole Manufacturing College
Efficient Plant Layout Design Project For A Small Scale Garment Workshop
One of the most common industrial problems is proper use of man, material, and machines properly. Some organizations are thriving to solve this problem even educational institutes. The key idea of this project is proper to use or efficient use of resources with available area. So this project begins with analyzing the total area used by a college and I have found that the college has 31,719.685 m2 area, from this much amount of space building of 8562 m2, a road 5149 m2, a green area of 5900 m2 is used, so by rough calculation the collage will have 12,108.685m2 space but the collage need much more space than this because students need a playground for football, there is no entertainment center even tv room, there is no lab workshop building area for maximizing college aim finally there is 2 building this to be planted with this area. This calculation will give us the college must maximize its efficiency with minimum requirements and available resources. So, I begin to solve this illusion by reduction of three garment workshops into two workshops and freeing the remaining workshop. In the methodology part there is a calculation based on every machinery manual and ISO standard specification, some of the data also counts from the literature. But finally using the requirements I found that the plant needs to place one workshop for garments only so other departments can use the remaining. This is a great opportunity for the college to increase its efficiency. Also, from my sample point yearly graduating class is very minimum like 24.6% only in garments this tells us the college must change its policy by adding more departments depending on customer needs. Finally, I will recommend deeply analyzing every system for future better work and to fulfill the components or materials need to build the facility.
Addis Ababa City Administration, Bole Manufacturing College, Haileyesus Wondwossen
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
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1. A presentation
0n
Design for assembly
Under the guidance of
Dr. R. Prabhu Sekhar
By
ARUN KUMAR
2018PD15
M.TECH(PDD)
MNNIT ALLAHABAD
2. INTRODUCTION
DFA is the method of design of the product for ease
of assembly.
The purpose statement of Design for assembly is to
minimize product cost through design and process
improvements.
3. DFMA Design for Manufacturing and Assembly
Design for Assembly (DFA)
concerned only with reducing product assembly cost
– minimizes number of assembly operations
– individual parts tend to be more complex in design
Design for Manufacturing (DFM)
concerned with reducing overall part production cost
– minimizes complexity of manufacturing operations
– uses common datum features and primary axes
5. Two Phases of Assembly
• Handling
• Insertion
can be done
• Manually
• Automatically
6. Design for assembly rules
Minimize part count
Design parts with self-locating features
Design parts with self-fastening features Minimize
reorientation of parts during assembly
Design parts for retrieval, handling, & insertion
Emphasize ‘Top-Down’ assemblies
Standardize parts…minimum use of fasteners.
Encourage modular design
Design for a base part to locate other components
Design for component symmetry for insertion
8. Can Parts Be Combined?
• Since there is no relative
motion between the parts .
• So these parts can be
made of the same material
9. Theoretical Part Count Efficiency
Theoretical Part Count Efficiency
Theoretical Min. No. Parts
Total Number of Parts
10. Guidelines for part assembly
try to design parts having the maximum
possible symmetry
Provide features that prevent jamming of
parts
Avoid features that allow tangling of parts
when stored in bulk
Avoid parts that stick together or are
slippery, delicate, flexible, very small or very
large, or that are hazardous to the handle
12. Design Guidelines for Insertion
. Design so that there is little or no
resistance to insertion
provide chamfers to guide the insertion of
two mating parts
Use pyramid assembly
Provision of self-locating features to avoid
holding down and alignment.
Design so that a part is located before it is
released.
13.
14.
15. Design Guidelines for fastening
There must be self fastening feature
Minimum use of fasteners
Consider the least expensive fastening
method that meets the requirements
Avoid the need to reposition the
partially completed assembly in the
fixture
20. Effect of Part Thickness and Size on Handling Time
The thickness of a “cylindrical” part is defined as its radius
for non cylindrical parts the thickness is defined as the maximum height of the
part with its smallest dimension extending from a flat surface
Cylindrical parts are defined as parts having cylindrical or other regular cross-
sections with five or more sides.
21. Effects of Obstructed Access and Restricted Vision on
Insertion of Threaded Fasteners of Various Designs.
When the distance from the obstructing surface to the hole center is
greater than 16 mm, the surface has no effect on the manipulations and
the restriction of vision is the only factor
22. Assembly Efficiency
An essential ingredient of the DFA method is the use
of a measure of the DFA index or “assembly efficiency
• Assembly Efficiency
N min= the theoretical minimum number of parts
23. Effect of Part Symmetry on Handling Time
One of the principal geometrical design features that affects the time
required to grasp and orient a part is its symmetry
Hera we can define two kinds of symmetry for a part:
Alpha Symmetry: Symmetry about an axis perpendicular to the axis of
insertion
Beta Symmetry: symmetry about the axis of insertion to repeat its
orientation
Total angle of symmetry = alpha+ beta
24. Parts Requiring Two Hands for Manipulation
A part may require two hands for manipulation when:
• The part is heavy
. • Very precise or careful handling is required.
• The part is large or flexible.
• The part does not possess holding features, thus making
one-hand grasp difficult.
25. Parts may Require Tweezers for Grasping and
Manipulation
A part may require tweezers when
• Its thickness is so small that finger-grasp is
difficult.
• Vision is obscured and prepositioning is difficult
because of its small size.
• Touching it is undesirable, for example, because
of high temperature.
• Fingers cannot access the desired location.
26. Worksheet analysis for the controller assembly
Item
name
Number
of items
Manual
handling
cod
Handling
time per
item, s
Manual
insertion
cod
Insertion
time per
item, s
Total
operation
time, s
Figures
for min.
parts
1
2
3
4
5
6
7
28. Large Assemblies
In the original DFA method, estimates of average handling and
insertion times were established.
DFA method in practice has shown that assembly time estimates are
reasonably accurate for small assemblies in low-volume production
where all the parts are within the easy arm reach of the assembly
worker
Clearly, with large assemblies, the acquisition of the individual parts
from their storage locations in the assembly area involves significant
additional time.
. However, in high-volume production situations, the screws are
often automatically fed, and so the time is reduced
The DFA method was extended to allow these possibilities, and more
accurate estimates of assembly times are obtained.
29. Identify opportunities to reduce secondary
operations
Re-orientation (assemble in Z axis)
Screwing, drilling, twisting, riveting, bending,
crimping.
Welding, soldering, gluing.
Painting, lubricating, applying liquid or gas
Testing, measuring, adjusting
30. Types of Manual Assembly Methods
Bench assembly For small parts placed within an easy reach of the
assembly worker
Multi station assembly handling times are adequate if multi
station assembly is employed.
Modular assembly center several parts that weigh more than
about 5 lb or that are over 12 in and not to easy arm’s reach of the
assembly worker
Custom assembly layout Here, the product is assembled on a
worktable or on the floor and the various storage shelves and
auxiliary equipment are arranged around the periphery of the
assembly area
Flexible assembly layout for large products a more flexible
arrangement can be used; this is called the flexible assembly layout