Needle punch、Double section thimble、Mould Manager、Die pin、Flat thimble supplier

The stamping life of the die punch is closely related to the processing technology, as long as the design and manufacture of the die meet the characteristics of the product parts. The service life of the die punch is determined by the following reasons.

① : material selection, the same brand, and the different manufacturers, the quality of the needle is different. For example, the Chinese mainland produces less than 50 brands of SKH-51.. The quality and value of each enterprise are different, and the quality of the die steel is different. In order to seize the market, some manufacturers only pursue profits, but do not pay attention to quality. In order to seize the market, they do whatever they can to reduce production costs, fight a price war, and seize the market opportunity with low prices. Similarly, the manufacturers of die punching needle also follow this method to participate in peer competition.

② : roughing process and allowance of punching needle; roughing turning of punching needle is also one of the important links that can not be ignored, and too much allowance can not be left in roughing process of punching needle. As long as the allowance is too much in the range of heat treatment variant, it is difficult to grind in finishing, the grinding speed is too fast, and it is easy to anneal, the characteristics, toughness and wear resistance of punching needle will be reduced. The grinding speed is slow, which reduces the production benefit and increases the production cost.

③ Heat treatment: heat treatment is the key factor to determine the service life of the punching needle. Good quality die steel also needs good heat treatment equipment and technology. Otherwise, all previous achievements will be wasted.
④ Finish machining: finish machining is the last process of punching needle. In the grinding process, the feed rate should be small, the feed rate of punching needle should not be greater than 0.5mm, and the feed rate greater than 0.5mm must be equipped with cooling system, coolant and other flushing equipment. During the grinding process, there should be no scorch and yellow burning. If there is scorch and yellow burning, it is equivalent to the secondary heat treatment, and it will be annealed, which will damage the chemical composition and organic structure of the material.

What are the requirements of precision mould needle insertion

Pin insertion is one of the indispensable parts of precision die parts. The quality will directly affect the product quality and size appearance. Therefore, the material selection and processing requirements are relatively higher than the general punch.

Performance one: dimensional accuracy

The dimension accuracy of rod diameter is usually within 0.01mm, and that of individual special requirements is within 0.005mm, even within 0.002mm. The accuracy of punch length is 0.02mm or 0.01mm, and the height of hanging table is 0.02mm or 0.01mm.

Performance 2: strength, toughness and high temperature resistance

In the production process of inserting needle, it often works under high temperature, so it must have the performance of high temperature resistance. At the same time, it often has to bear huge impact force, which leads to the phenomenon of easy fracture and broken needle. In order to prevent the die pin from breaking suddenly, it must have high strength and toughness. The toughness of die insert mainly depends on the carbon content, grain size and microstructure of the material. Therefore, material selection is very important.

Performance 3: wear resistance, high hardness

During the plastic deformation of the insert needle in the mold cavity, it continuously slides along the cavity surface, resulting in huge friction between the cavity surface and the insert needle, which is very easy to wear. Therefore, the material selection should be high-speed tool steel with high tungsten content and strong wear resistance. The material must be vacuum heat treated and then ultra cryogenic treatment, and the hardness after ultra cryogenic treatment is relatively uniform. At the same time, its toughness and wear resistance are enhanced. This is one of the most basic and crucial factors. Generally speaking, the higher the hardness, the smaller the wear, the better the wear resistance.