In order to improve the efficiency of the mold, we can rationally select the mold material, improve the working conditions、 the quality and life of the mold, so as to better use the mold. Below, regarding the mold material, it is necessary to pay attention to two major points when selecting.
1. Selection of mold materials
When selecting mold materials, we should select according to different production batches, process methods and processing objects. In mass production, long-life mold materials, such as hard alloys, high-strength, high-wearing mold steels (such as YG15, YG20) should be used. For small batches or new products, zinc alloys, bismuth-tin alloys, etc. can be used for trial production. Mold material; for general molds that are easy to deform and break easily, high-strength, high-toughness materials (T10A) are required; hot forging dies are required to have good toughness, strength, mold resistance and resistance to cold and heat fatigue. Materials (such as 5CrM-nMo); die-casting molds should use alloy steel with high thermal fatigue resistance and high temperature strength (such as 3Cr2W8V); plastic molds should be made of materials that are easy to cut, dense, and polished. In addition, when designing the punch and the die, it is preferable to match the molds of different hardness or different materials, such as: tool steel for punch (such as T10A), high carbon and high chromium steel for die (such as Cr12, Cr12MoV), The mold life can be increased by 5 to 6 times.
2, Reasonable mold structure
The principle of mold design is to ensure sufficient strength, stiffness, concentricity, neutrality and reasonable blanking clearance, and reduce stress concentration to ensure that the parts produced by the mold meet the design requirements. Therefore, the main work of the mold is zero (such as the convex and concave die of the die, the movement of the injection mold, the fixed die, the upper and lower die of the die forging die, etc.), which requires high guiding precision, concentricity and neutrality, and punching. The gap is reasonable.
When designing a mold, the important considerations are:
1 Care must be taken when designing the punch to guide the support and centering. In particular, the design of the small hole punch uses its own guiding structure to extend the life of the mold.
2 For weak parts such as angles and narrow grooves, in order to reduce stress concentration, a circular arc transition is required, and the radius R of the arc may be 3 to 5 mm.
3 For the complex structure of the die, the inlay structure can also reduce the stress concentration.
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