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What is the standard injection mold development process?
Original: Original | Author: DGMF Mold Clamps | Publish Time: 2020-04-21 | 14876 Views | Share:
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.

What is the standard injection mold development process?- DGMF Mold Clamps Co., Ltd

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.