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Notes about producing cemented carbide molds

Time : 2024-03-14 Hits : 3

Carbide mold is a type of cemented carbide with high hardness, corrosion resistance, high temperature resistance and small expansion coefficient. Tungsten cobalt is generally used as raw material. Common carbide molds on the market include: cold heading dies, cold punching dies, wire drawing dies, hexagonal dies, spiral dies, etc. Compared with traditional metal molds, carbide molds have the advantages of high production efficiency, good workpiece quality, and long mold life. We should consider the following matters when producing cemented carbide:


a. Conducive to demoulding: The demoulding mechanism of general molds is in the movable mold, so when selecting the parting surface, the product should be kept in the movable mold as much as possible after the mold is opened. Therefore, for some places where the fixed mold may stick, we often add a fixed mold auxiliary demoulding mechanism.


b. Consider the lateral mold opening distance: Generally, the lateral mechanical mold opening distance is relatively small. Therefore, when selecting the parting surface, the longer direction of the core pulling distance should be selected in the direction of opening and closing of the front and rear molds, and the shorter direction should be used as the lateral parting.



c. Ensure product appearance and quality: Do not choose the parting surface on the smooth outer surface of the product. Generally speaking, pinch lines and other lines that affect the appearance are not allowed to appear on the appearance surface; for some products with concentricity requirements, all parts with concentricity requirements must be placed on the same side, so as to ensure their concentricity.


d. Conducive to exhaust: When the parting surface is used as the main exhaust, the parting surface should be designed at the end of the plastic flow to facilitate exhaust.


e. R parting: For many products in mold design, there is a full circle of R angles on the parting surface. At this time, the parting must take into account the best parting of R, and there must be no sharp edge.


f. Meet the product demoulding requirements: the parting surface is for the product to be taken out of the mold smoothly. Therefore, the position of the parting surface should be selected at the part with the largest cross-section size of the product. This is the most basic principle.


g. Mold parts are easy to process: When selecting the parting surface, the mold should be divided into parts that are easy to process to reduce the difficulty of machining.

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