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1. Accept the task letter

The task statement for forming plastic parts is usually proposed by the part designer, and its contents are as follows:Plastic mold design process

⑴The drawings of formal parts that have been approved and signed, and indicate the grade and transparency of the plastic used.

⑵Instructions or technical requirements for plastic parts. Plastic mold design process

⑶ production output.

⑷ samples of plastic parts.

Usually the mold design task book is put forward by the plastic parts craftsman according to the task book for forming plastic parts, and the mold designer designs the mold based on the forming plastic part task book and the mold design task book.

2. Collect, analyze and digest raw data

Collect and sort out information about part design, molding process, molding equipment, machining and special processing for use in mold design.

(1) Digest the drawings of plastic parts, understand the use of parts, and analyze the technical requirements of plastic parts such as manufacturability and dimensional accuracy. For example, what are the requirements for plastic parts in terms of appearance shape, color transparency, and performance; whether the geometric structure, slope, and inserts of plastic parts are reasonable; Assembly, electroplating, bonding, drilling and other post-processing.

Select the size with the highest dimensional accuracy of the plastic part for analysis to see if the estimated molding tolerance is lower than the tolerance of the plastic part, and whether a satisfactory plastic part can be formed. In addition, it is necessary to understand the plasticization and molding process parameters of plastics.

⑵ Digest the process data, and analyze whether the molding method, equipment model, material specification, mold structure type and other requirements proposed in the process task book are appropriate and whether they can be implemented.

Molding materials should meet the strength requirements of plastic parts, and have good fluidity, uniformity, isotropy, and thermal stability. According to the use of plastic parts, the molding material should meet the requirements of dyeing, metal plating conditions, decorative properties, necessary elasticity and plasticity, transparency or opposite reflection properties, adhesiveness or weldability.

3. Determine the molding methodInjection molding processing injection moulding products

Use direct pressure method, casting method or injection method.

4. Select molding equipment

Molds are made according to the type of molding equipment, so it is necessary to be familiar with the performance, specifications, and characteristics of various molding equipment.

For example, for an injection machine, the following should be known in terms of specifications: injection capacity, clamping pressure, injection pressure, mold installation size, ejector device and size, nozzle hole diameter and nozzle spherical radius, sprue sleeve positioning ring size, The maximum and minimum thickness of the mold, the stroke of the template, etc., see the relevant parameters for details. It is necessary to preliminarily estimate the dimensions of the mold and judge whether the mold can be installed and used on the selected injection machine.

5. Specific structure plan:

⑴ Determine the mold type

Such as compression mold (open, semi-closed, closed), casting mold, injection mold, etc.

⑵ Determine the main structure of the mold type

Choosing the ideal mold structure is to determine the necessary molding equipment, the ideal number of cavities, and the work of the mold itself can meet the requirements of the process technology and production economy of the plastic part under absolutely reliable conditions. The technical requirements for plastic parts are to ensure the geometric shape, surface finish and dimensional accuracy of plastic parts. The economic requirements of production are to make the cost of plastic parts low, the production efficiency high, the mold can work continuously, the service life is long, and labor is saved.

Plastic mold design process