Cavity layout. The number of cavities and their arrangement are determined based on the geometric structure characteristics of the plastic part, dimensional accuracy requirements, batch size, difficulty in mold manufacturing, mold cost, etc.
2. Determine the parting surface. The position of the parting surface should be conducive to mold processing, exhaust, demoulding and molding operations, as well as the surface quality of plastic parts, etc. mold systems.
3. Determine the pouring system (shape, location, size of main runner, sub-runner and gate) and exhaust system (exhaust method, exhaust slot location, size).
4. Select the ejection method (ejector rod, ejection tube, push plate, combined ejection), and determine the undercut treatment method and core pulling method.
5. Determine the cooling and heating methods, the shape and position of the heating and cooling grooves, and the installation location of the heating element.
6. Based on the mold material, strength calculation or empirical data, determine the thickness and outer dimensions of the mold parts, the outer structure and the positions of all connections, positioning and guide parts.
7. Determine the structural form of the main molded parts and structural parts.
8. Considering the strength of each part of the mold, calculate the working dimensions of the molded parts. If the above problems are solved, the structural form of the mold will naturally be solved. At this time, you should start drawing a sketch of the mold structure to prepare for formal drawing.