What is the standard injection mold development process?

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What is the standard injection mold development process?
First, draw the mold map
Before drawing the final assembly drawing of the mold, the process drawing should be drawn up,
and it should meet the requirements of the workpiece drawing and process data. The size
guaranteed by the next process shall be marked with the words "process size" on the drawing. If,
after molding, no other machining is performed except for repairing burrs, the process drawing is
exactly the same as the workpiece drawing.
It is best to mark the part number, name, material, material shrinkage, drawing ratio, etc. under
the process diagram. Usually, the process drawing is on the mold assembly drawing.
Draw the final assembly drawing as much as possible using the 1: 1 ratio. The cavity is drawn first,
and the main view and other views are drawn simultaneously.
The die assembly drawing should include the following:
Mold forming part structure
Structure of the pouring system and exhaust system.
Parting surface and parting method.
Shape structure and all connecting parts, positioning and guide parts.

Mark the height of the cavity (not required, as required) and the overall size of the mold.
Auxiliary tools (tools for removing parts and molds, calibration tools, etc.).
Compile all part numbers in sequence and fill in the detailed list.
Mark the technical requirements and instructions for use.
Technical requirements of the assembly drawing of the mold:
For the performance requirements of certain systems of the mold. For example, assembly
requirements for the ejection system and slider core pulling structure.
Requirements for the mold assembly process. For example, after the mold is assembled, the
bonding gap of the bonding surface of the parting surface should not be greater than the
parallelism requirements of 0.05 mm above and below the mold, and the size determined by the
assembly and the requirements for this size are pointed out.
The use of mold, assembly and disassembly method.
Anti-oxidation treatment, mold number, lettering, marking, oil seal, storage and other
requirements.
Relevant requirements for trial testing and inspection.
The order of disassembling and drawing the part drawing from the assembly drawing of the mold
should be: first inside and then outside, first complicated and then simple, first forming parts,
then structural parts.
Requirements are as follows:
Graphics requirements
Be sure to draw to scale, allowing zoom in or out. The view selection is reasonable, the projection
is correct, and the layout is proper. In order to make the processing patent number easy to
understand and easy to assemble, the graphics should be as consistent as possible with the
general assembly drawing, and the graphics should be clear.
The dimensioning requirements are uniform, centralized, orderly and complete
The order of dimensions is the first to mark the dimensions of the main parts and the draft angle,
then mark the matching dimensions and then mark all the dimensions. Mark the matching
dimensions on the non-main part drawing first, and then mark all the dimensions.
Surface roughness
Mark one of the most applied roughnesses in the upper right corner of the drawing, such as
"Remaining 3.2." Other roughness symbols are marked on each surface of the part.
Other content
For example, the part name, mold drawing number, material grade, heat treatment, and
hardness requirements, surface treatment, graphics ratio, free-size processing accuracy, technical
description, etc. must be filled incorrectly.
2. Proofreading and drawing review
The relationship between mold and parts and plastic parts drawings
Whether the material, hardness, dimensional accuracy and structure of the mold and mold parts
meet the requirements of the plastic parts drawings.
Plastic parts

Whether the flow of plastic material flow, shrinkage holes, welding marks, cracks, and release
angle affect the requirements of the performance, dimensional accuracy and surface quality of
plastic parts. Are there any deficiencies in the design of the pattern, whether the processing is
simple, and whether the shrinkage of the molding material is selected correctly.
Molding equipment
The injection volume, injection pressure, and clamping force are not enough. Are there any
problems with the installation of the mold, the south core of the plastic parts, and the demolding?
Is the nozzle of the injection machine properly contacting the nozzle sleeve?
Mold structure
Whether the location of the parting surface and the precision of the finishing meet the needs,
will there be flashing, and whether the plastic parts can be left on the side of the mold with the
ejector after the mold is opened.
Whether the demoulding method is correct, whether the size, position, and quantity of the
extension rod and push tube are appropriate, will the push plate be stuck by the core, and will it
cause scratches to the molded parts.
Mold temperature adjustment. The power and number of heaters; whether the position, size,
and a number of cooling medium flow lines are appropriate.
The method for dealing with undercuts made of plastic parts is whether the mechanism for
removing the undercuts is appropriate, for example, whether the slider and the push rod in the
inclined guide column core pulling mechanism interfere with each other.
Whether the location and size of the pouring and exhaust system are appropriate.
Design drawings
Whether the placement of each mold part on the assembly drawing is appropriate, whether it is
clearly shown, and whether there are any omissions;
Part number, name, production quantity, internal or outsourcing parts, standard parts or
non-standard parts on parts drawing Whether the materials, heat treatment, surface treatment,
and surface finishing degree are marked and stated clearly.
Working dimensions and matching dimensions of main parts and molded parts. The size figures
should be correct and do not allow the producer to convert.
Check the view positions of all parts drawings and assembly drawings, whether the projection is
correct, whether the drawing method conforms to the drafting national standard, and whether
there is any missing size.
Check processing performance
Whether the geometry structure, view drawing method, size scales, etc. of all parts are conducive
to processing
The main working size of the auxiliary tool for recalculation
Professional proofreading is in principle carried out according to the designer ’s self-checking
project; however, it should focus on structural principles, process performance, and operational
safety. When drawing, we must first digest the graphics, draw according to the requirements of
the national standard, and fill in all the dimensions and technical requirements. Self-check and

sign after tracing.
It is customary for the designer to proofread and sign the drawn base map. It is customary for the
technicians in the tool manufacturing unit to review, sign, and check the manufacturability before
sending them to the sun.
Write manufacturing process cards
The technical personnel of the tool manufacturing unit compiles the manufacturing process card
and prepares for processing and manufacturing.
In the manufacturing process of mold parts, inspection should be strengthened, and the focus of
inspection should be on dimensional accuracy. After the mold assembly is completed, the
inspector will check according to the mold inspection table. The main thing is to check whether
the performance of the mold parts is good. Only in this way can the quality of the mold be
guaranteed.
3. Trial and repair
Although the mold design is carried out under the expected process conditions when selecting
the molding material and molding equipment, people's understanding is often imperfect, so it is
necessary to conduct a trial test after the mold processing is completed to see the molded parts
How about the quality. After discovering that it is always afterward, carry out repairs to eliminate
errors.
There are many types of undesirable phenomena in plastic parts, the reasons are also very
complicated, there are mold reasons and process conditions, and the two are often only together.
Before repairing the mold, detailed analysis and research should be carried out according to the
actual situation of the bad phenomenon of the plastic parts, and the remedy should be proposed
after finding the cause of the defects of the plastic parts. Because the molding conditions are
easy to change, the general approach is to change the molding conditions first and only consider
repairing the mold when changing the molding conditions does not solve the problem.
It is more prudent to repair the mold, and you can't act rashly without being very sure. The
reason is that once the mold conditions are changed, it cannot be remodeled and restored to its
original state.
Whether the performance of the parts is good or not, only in this way can the manufacturing
quality of the slang mold be said.
Fourth, organize the data for archiving
After the mold is tested, if it is not used for a while, it should be completely wiped off the mold
residue, dust, oil stains, etc., coated with butter or other anti-rust oil or anti-rust agent, and
closed to the storage place for storage.
From the beginning of the design of the mold to the successful processing of the mold and the
passing of the inspection, the technical information generated during this period, such as the task
book, part drawing, technical manual, mold assembly drawing, mold part drawing, base drawing,
mold design manual, inspection record Forms, mold trial and repair records, etc. shall be
systematically organized, bound, and numbered for filing in accordance with regulations. This
seems to be troublesome, but it is very useful for repairing molds and designing new ones in the

future.

What is the standard injection mold development process?

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