First, the basic idea of design:

 　　According to the basic requirements of the plastic parts and plastic process performance, carefully analyse the plastic parts of the process, correctly determine the moulding method and moulding process, select the appropriate plastic injection moulding machine, and then carry out the plastic mould design.

Second, the design of the required attention:

 　　1, consider the relationship between plastic injection moulding machine process characteristics and mould design;.

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

 　　3, the correctness of the structure shape and size, manufacturing process feasibility, material and heat treatment requirements and correctness, view expression, size standards, shape and position error and surface roughness and other technical requirements to comply with international standards or national standards.

       　4, the design should be taken into account to facilitate processing and maintenance and repair, safety and reliability and other factors.

 　　5, combined with the actual conditions of production to consider the design of the mould is easy to process, low cost.

 　　6, for complex moulds, consider the use of machining methods or special processing methods, how to assemble after processing, after the trial mould with sufficient margin for mould repair and other issues.

Third, plastic mould design process:

 　　1, accept the mission statement:

 　　There are generally the following three cases:

 　　A: the customer to give a validation of the plastic parts drawing and its technical requirements (two-dimensional electronic files, such as AUTOCAD, WORD, etc.). At this time you need to build a three-dimensional model (product design work), and then out of the two-dimensional engineering drawings.

 　　B: The customer gives a validated drawing of the plastic part and its technical requirements (3D electronic drawing files, such as PROE, UG, SOLIDWORKS, etc.). Just produce 2D drawings. (Commonly used)

 　　C: Customers are given samples of moulded parts, hand boards, and objects. At this time the requirements of mapping plastic parts copy processing, and then build a three-dimensional model, and then out of two-dimensional engineering drawings.

 　　2、Collect, analyse and digest the original data:

 　　A: analysis of plastic parts

 　　a: Define the design requirements of the plastic parts, through the drawings to understand the material used in the plastic parts, design requirements, complex shapes and high precision requirements of the plastic parts of the use of occasions, assembly and appearance requirements.

 　　b:Analyse the possibility and economy of the moulding process of the plastic parts.

 　　c:Define the production batch of plastic parts (production cycle, production efficiency) generally indicated in the customer's order.

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

 　　The above analysis is mainly for the selection of injection equipment, improve equipment utilization, determine the number of mould cavities and mould filling cavity size.

 　　B: Analyse the plastic moulding process: moulding method, moulding equipment, material type, mould category, etc..

 　　3、Master the actual production situation of the manufacturer:

 　　A: the technical level of the manufacturer's operating workers

 　　B: manufacturers of existing equipment technology

 　　C: the technical specifications of the moulding equipment the diameter of the positioning ring of the injection machine, the radius of the sphere at the front of the nozzle and the size of the aperture, the maximum injection volume, the injection pressure, the injection speed, the clamping force, the maximum and the minimum opening distance between the fixed side and the movable side, the size of the projected area of the fixed plate and the movable plate and the installation of the screw holes and their sizes, the adjustable length of the injection machine adjusting nut, the maximum opening stroke, the spacing of the injection machine drawbars, the diameter and the position of the ejector rod, the ejector stroke and so on. Diameter and position of ejector rod, ejector stroke, etc.

 　　D: manufacturers of commonly used manufacturers of mould materials and accessories to order and processing methods (preferably in the factory processing)

 　　4、Determine the structure of the mould:

 　　General ideal mould structure:

 　　A: technical requirements: geometry, dimensional tolerances, surface roughness, etc. in line with international standards.

 　　B: production and economic requirements: low cost, high productivity, long service life of the mould, easy processing and manufacturing.

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