Profiles refer to bar, sheet and other profiles of various sections. This is the most commonly used type of blank in mold parts. After blanking, it is sent to the processing workshop for surface processing. The main cutting methods of this kind of material are shearing, sawing, grinding wheel cutting, flame cutting, breaking, etc.
Forging is a kind of blank which can obtain reasonable geometry and size by forging. Forging mainly includes axial upsetting drawing, transverse upsetting drawing and multi-directional upsetting drawing. The purpose of forging is to obtain reasonable geometry and machining allowance, save raw materials and reduce machining amount. The structure of the metal is improved, the porosity and bubbles are improved, and the density is increased. Improve the direction of metal fiber in the blank, make its distribution more reasonable, improve the bearing capacity and performance of parts. Improve the unreasonable distribution of carbide in the material, improve the heat treatment performance, machinability and die service life.
The common casting in plastic mould includes cast steel, cast iron, aluminum casting, etc. The shape and size of castings shall meet the requirements of casting drawings, and their chemical composition and mechanical properties shall meet the requirements. The surface of casting shall be sand cleaned and scabs, flying edges and burr shall be removed, and the residual height shall not be more than 3mm. There should be no porosity, sand hole, crack and other defects in the inner part of casting, especially near the working face, and there should be no serious porosity and large shrinkage hole in the non working face. The castings should be heat treated in time, the steel castings should be annealed completely, and the cast iron should be aging treatment to eliminate the internal stress and improve the processing performance.
4. Mold standard parts
With the development of mold specialization, there are more and more mold base, template and other parts in the form of commodity. After using these mold standard parts, only the molding surface and related parts can be processed, which greatly shortens the mold manufacturing cycle. With the development of mold technology, plastic mold standard parts will be the mainstream direction of mold parts blank.
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