Plastic mold requirements for materials
Different types of plastic products, different product molding processes, have different requirements on the material, performance and shape of the mold. So what are the plastic mold requirements for materials?
After the mold is applied for a long time, it is necessary to sharpen the cutting edge. After grinding, it is necessary to demagnetize the cutting edge surface, and it is not possible to have magnetic properties, otherwise it is easy to break the material. The mold application company should do detailed records, calculate its application, maintenance (smooth, clean, rust-proof) and damage conditions, according to which components and components can be found damaged, and the degree of wear is fine, in order to supply information for discovering and solving problems. And the molding technical parameters of the mold and the materials used in the product, in order to shorten the test time of the mold and improve the production power. The mold function should be tested under the normal working conditions of the injection molding machine and the mold, and the dimensions of the finished plastic parts should be measured. After the information, the existing condition of the mold can be determined, and the cavity, core, cooling system and points can be found. The damage location of the profile, etc., based on the information supplied by the plastic part, can determine the damage status of the mold and the repair method.
As for the injection mold, the accuracy of the plastic parts is 3 and 3a, the component is 5 grams, the hardening casting system is used, the number of cavities is 4-6; the plastic parts are usually accurate (4-5), forming. The material is some crystalline material, the number of cavities can be 16-20; the component of plastic parts is 12-16g, the number of cavities is 8-12; and the component of 50-100g is plastic parts, the number of cavities is taken 4-8. Regarding amorphous plastic parts, the number of cavities is 24-48, 16-32 and 6-10. When the plastic parts are continuously added, the multi-cavity mold is rarely used. Plastic parts with a precision of 7-9, the number of multi-cavities increased to 50% compared with the indicated accuracy of 4-5 grades.
Excellent mold material, high hardness The main materials of the mold are mostly made of high-quality alloy steel, especially high-life molds, often made of Crl2, CrWMn and other Leysite steel. plastic mold
The side wall of plastic parts with leather grain, sand blasting, etc. should be added with a draft angle of 3°~5°, depending on the specific bite depth. The general sun-printing plate is clearly available for reference. The use of the required mold angle. The deeper the bite flower depth, the larger the draft angle should be. The recommended value is 1°+H/0.0254° (H is the bite depth). For example, the grain stripping slope of 121 is generally 3°, and the pattern of 122 is demolded. The slope is generally 5°.