Specific operation process of injection mold manufacturing

Update:29 Sep 2020

The specific operation process of mold manufacturing:

First of all, the task book for injection molded plastic parts is usually proposed by the part designer, and the content is as follows:

1. The approved drawings of formal parts, and indicate the grade and transparency of the plastic.
2. Manual or technical requirements for plastic processed parts.
3. Production output.
4. Samples of plastic parts.

Usually the mold design task book is proposed by the plastic parts craftsman based on the task book of the molded plastic part, and the mold designer designs the mold based on the task book of the molded plastic part and the mold design task book. Then, collect, analyze, and digest the original data to collect and sort out relevant part design, molding process, molding equipment, mechanical processing and special processing data for use when designing molds.

A. Digest the drawings of plastic parts, understand the purpose of the parts, 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, color transparency, and performance, whether the geometric structure, slope, and inserts of the plastic parts are reasonable, the allowable degree of forming defects such as weld marks and shrinkage holes, and whether they are coated or not. Post-processing such as assembly, electroplating, bonding and drilling. Select the size with the highest dimensional accuracy of the plastic part for analysis, and see if the estimated molding tolerance is lower than that of the plastic part, and whether the plastic part that meets the requirements can be molded. In addition, we must understand the plasticization and molding process parameters of plastics.

B. Digest the process data, 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. The molding material should meet the strength requirements of plastic parts, have good fluidity, uniformity, isotropy, and thermal stability. According to the purpose of the plastic parts, the molding material should meet the requirements of dyeing, metal plating, decorative properties, necessary elasticity and plasticity, transparency or opposite reflection properties, adhesiveness or weldability.

C. Determine the injection molding method, direct pressure method, casting method or injection method.

D. Choose molding equipment and mold according to the type of molding equipment. Therefore, you must be familiar with the performance, specifications, and characteristics of various molding equipment. For example, for an injection machine, the following should be understood in terms of specifications: injection capacity, clamping pressure, injection pressure, mold installation size, ejection device and size, nozzle hole diameter and nozzle spherical radius, sprue sleeve positioning ring size, The maximum and minimum mold thickness, template stroke, etc., please refer to the relevant parameters for details. It is necessary to preliminarily estimate the size of the mold and determine whether the mold can be installed and used on the selected injection machine.

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