Mold is the necessary process equipment for plastic molding production. In the past, mold design mainly depended on the experience of technicians. The mold processing and manufacturing relies heavily on the operating skills of workers. Therefore, the mold design level is low, the processing quality is poor, the production cycle is long, the service life is short, and the replacement of new products will be disturbed by mold problems.

The difference between precision molds and ordinary molds is mainly reflected in the accuracy. The key dimensions of many precision molds are not allowed to have inclination, but the tolerance zone is generally used to add a small inclination when making molds, such as gear mounting posts.

Mold processing generally has three methods: casting, cutting and special processing. (1) Casting processing and casting processing methods, mainly including zinc alloy casting (applicable to cold stamping dies, plastic molds, rubber molds), low melting point alloys (applicable to cold stamping dies, plastic molds), Shore casting methods, beryllium copper alloy casting (plastic molds) Zinc alloy molds, low melting point alloys and synthetic resin casting molds cast by methods such as molds) and synthetic resin casting (suitable for cold stamping dies), and are used for the preparation of upper and lower templates for cold stamping dies, large drawing dies and blanks for frame parts piece preparation.

For the mold processing plant management system, the success or failure of product development depends on the experience of the engineering and technical personnel of the precision mold factory and the technical exchanges between users in the mold industry.

Processing Features: (1) Any hard, brittle, tough, soft, high-melting conductive materials can be processed, and under certain conditions, semiconductor materials and non-conductive materials can also be processed.

Precision parts machining Not all materials can be precision machined. Some materials have too much hardness and exceed the hardness of the machined parts, which may break the parts. Therefore, these materials are not suitable for precision machining unless they are special Parts made of material, or laser cutting. The materials for precision parts processing are divided into two categories, metal materials and non-metal materials.

General rules for precision mold design: 1. Use the FUTABA standard mold base structure to form the mold base. 2. Use positive steel or standard mold parts and accessories of the same specification. 3. All guide pins (GUIDE PIN) and bushings (BUSHING) must have a convex shape at the end.

Gear hobbing is the principle of generative method to process gears. Using a hob to process a pair of wheels is equivalent to a pair of staggered helical wheel meshing. Hobbing gears belong to the generation method, which can be regarded as gear and rack transmission without meshing clearance. When the hobbing gear rotates once, it is equivalent to the rack moving one tooth in the normal direction, and the continuous transmission of the hob is like an infinitely long rack moving continuously. When the hob and the hobbing blank are in strict accordance with the transmission ratio of the gear to the rack, the envelope of the hob teeth at a series of positions forms the involute tooth shape of the workpiece. With the vertical feed of the hob, the desired involute profile can be hobbed.

1. Digest the drawings of plastic parts, understand the use of the parts, and analyze the technical requirements such as the craftsmanship 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, inclination, inserts, etc. of plastic parts are reasonable, the degree of acceptance of welding marks, shrinkage holes and other forming defects, whether there is coating Assembly, electroplating, gluing, drilling and other post-processing. Select the scale with the highest dimensional accuracy of plastic parts for analysis, and see if the estimated molding tolerance is lower than that of the plastic parts, and whether the plastic parts that meet the requirements can be molded. In addition, it is necessary to understand the plasticization and molding process parameters of plastics.