How to understand the characteristics of plastic molds and improve service life?

(1) Requires high precision. A pair of molds generally consists of die, convex mold and mold frame, some of which can be multi-piece die-split. Therefore, the combination of upper and lower molds, the combination of mounting and cavity, and the assembly of modules all put forward high demands on processing accuracy. Precision molds tend to have dimensional accuracy of up to the level of sm.
(2) Shapes and surfaces are complex products, such as car covers, aircraft parts, toys and household appliances, with shaped surfaces consisting of multiple surfaces. Therefore, the surface of the mold cavity is more complex. Some surfaces must be mathematically processed.
(3) Small batch mold production is not mass production. In many cases, only one payment is made.
(4) mold processing multi-process, often the use of milling, boring, drilling, hinging, tapping and other processes.
(5) Repeat the life of the mold. When a pair of molds is used beyond its useful life, a new mold must be replaced, so mold production is often repeated.
(6) There are sometimes no drawings or data in the production of imitation molds, and the imitation process should be carried out in kind. This requires high simulation accuracy and no deformation.
(7) Mold materials are excellent, high hardness molds are mostly high-quality alloy steel, especially high-life molds, commonly used Cry2, CrWMn and other materials. These steels have strict requirements from rough forging and processing to heat treatment. Therefore, the preparation of processing technology can not be ignored, heat treatment deformation is also the processing process needs to be taken seriously.
According to the above characteristics, the selection of machine tools should try to meet the processing requirements. For example, CNC systems must be powerful, and machine tools must have high accuracy, good stiffness, good thermal stability and contouring.
How to improve the service life of the mold
For users, improving the life of the mold can greatly reduce stamping costs. The factors that affect the life of the mold are as follows:
(1) the type and thickness of the material;
(2) whether to choose a reasonable mold clearance;
(3) the structural form of the mold;
(4) whether the material has good lubrication when stamping;
(5) whether the mold has been special surface treatment;
(6) such as titanium plating, titanium carbon nitride;
(7) alignment of the turrets up and down;
(8) reasonable use of adjustment gaskets;
(9) whether the correct use of oblique edge mold;
(10) whether the machine tool frame is worn;
Process scheduling
(1) to ensure that the processing volume of the bottom surface processing;
(2) Casting blank pair, 2D, 3D surface margin check;
(3) 2D, 3D profile roughing, non-mounting surface, non-working surface processing (including safety platform surface, bumper mounting surface, pressure plate surface, side plane);
(4) Before semi-finishing, the alignment of the side plane should ensure accuracy;
(5) Semi-finishing 2D, 3D profiles, finishing all kinds of mounting work surfaces (including block mounting surface and contact surface, block mounting surface and backrest, punch mounting surface, chip knife mounting surface and support back, spring mounting surface and contact surface, various travel restriction work surface, oblique wedge mounting surface and back), various guide surfaces, guide holes, residual reference holes, finishing height reference surface semi-finished products, and data;
(6) the inspection and evaluation of processing accuracy;
(7) fitter mosaic process;
(8) Before finishing, aim at the plane of the technical reference hole and check the remaining amount of the block;
(9) finishing section 2D, 3D, side punch profile and hole position, finishing reference hole and height reference, guide surface and guide hole;