1. Basic design ideas:

Based on the basic requirements of plastic parts and the process performance of plastics, carefully analyze the processability of plastic parts, correctly determine the molding method and molding process, select a suitable plastic injection molding machine, and then design the plastic mold.

2. Things to note when designing:

　　1. Consider the relationship between the process characteristics of the plastic injection molding machine and the mold design;

 2. The rationality, economy, applicability and practical feasibility of the mold structure.

​​3. Technical requirements such as the correctness of structural shape and size, feasibility of manufacturing process, material and heat treatment requirements and correctness, visual expression, dimensional standards, shape position error and surface roughness must comply with international standards or national standards.

4. Factors such as ease of processing and maintenance, safety and reliability should be taken into consideration when designing.

5. Consider designing molds based on actual production conditions to make them easy to process and low in cost.

　　6. For complex molds, consider using mechanical processing methods or special processing methods, how to assemble after processing, and having sufficient mold repair margin after mold trial.

3. Plastic mold design process:

　　1. Accept the assignment letter:

　　There are generally three situations:

A: The customer provides the approved plastic part drawing and its technical requirements (two-dimensional electronic drawing files, such as AUTOCAD, WORD, etc.). At this time, a three-dimensional model (product design work content) needs to be constructed, and then a two-dimensional engineering drawing is produced.

B: The customer provides the approved plastic part drawing and its technical requirements (three-dimensional electronic drawing files, such as PROE, UG, SOLIDWORKS, etc.). Just produce a 2D engineering drawing. (for common situations)

C: The customer provides plastic parts samples, prototypes, and actual objects. At this time, it is required to measure and process the plastic parts, then build a three-dimensional model, and then produce a two-dimensional engineering drawing.

 2. Collect, analyze and digest original data:

A: Analyze plastic parts

a: Clarify the design requirements of the plastic parts, and understand the materials used in the plastic parts through the drawings, the design requirements, the usage occasions of plastic parts with complex shapes and high precision requirements, assembly and appearance requirements, etc.

　　b: Analyze the possibility and economy of the molding process of plastic parts

　　c: Clarify the production batch size (production cycle, production efficiency) of plastic parts. Generally, it is indicated in the customer order.

　　d: Calculate the volume and weight of the plastic part.

The above analysis is mainly to select injection equipment, improve equipment utilization, and determine the number of mold cavities and the size of the mold feeding cavity.

B: Analyze the plastic molding process: molding method, molding equipment, material model, mold category, etc.

3. Understand the actual production situation of the manufacturer:

A: Technical level of factory operators

B: The manufacturer’s existing equipment and technology

C: Technical specifications of the molding equipment: diameter of the positioning ring of the injection machine, spherical radius and hole size at the front end of the nozzle, maximum injection volume, injection pressure, injection speed, clamping force, maximum and minimum distance between the fixed side and the movable side , the projected area size of the fixed plate and the movable plate and the position and size of the mounting screw holes, the adjustable length of the injection machine distance-adjusting nut, the maximum mold opening stroke, the spacing of the injection machine tie rods, the diameter and position of the ejector rod, the ejector stroke, etc. .

D: Ordering and processing methods for mold materials and accessories commonly used by manufacturers (preferably processed in our factory)

4. Determine the mold structure:

　General ideal mold structure:

A: Process technology requirements: geometric shape, dimensional tolerance, surface roughness, etc. must comply with international standards.

B: Production economic requirements: low cost, high productivity, long mold service life, and easy processing and manufacturing.

C: Product quality requirements: meet all requirements of customer drawings.