The Small Details Of The Plastic Mold In The Design Process

Collect and organize relevant parts design, molding process, molding equipment, mechanical processing and special processing materials for use when designing molds.

1. Digest the drawings of plastic parts, understand the purpose of the parts, and analyze the technical requirements such as the manufacturability and dimensional accuracy of the plastic parts. For example, what are the requirements of 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 welding marks, shrinkage and other molding defects, and whether there is coating or not. Post-processing such as assembly, electroplating, bonding, drilling, etc. Select the size of the plastic part with high dimensional accuracy or analysis, and see if the estimated molding tolerance is lower than the tolerance of the plastic part, and whether the plastic part that meets the requirements can be molded. In addition, it is necessary to understand the plasticization and molding process parameters of plastics.

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

The molding material should meet the strength requirements of plastic parts, and have good fluidity, uniformity, isotropy, and thermal stability. According to the purpose of the plastic part, 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.

3. Determine the molding method

Using direct pressure method, casting pressure method or injection method.

4, select molding equipment

Molds are made according to the type of molding equipment, so 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 large and small thickness of the mold, the stroke of the template, 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.