Detailed introduction





Some information of barrel screw?

  barrel screwThe development prospect of this industry is very good, because it brings more benefits to the enterprise when it is used, so it is favored by customers. In order to make everyone more familiar with it, understand its daily use, and better The benefits brought to the enterprise, next we will talk about the small knowledge points related to the barrel screw, hoping to help more people, let it bring more benefits.



The mixing section of the barrel screw is an inwardly grooved structure arranged at the end of the homogenizing section of the ordinary screw, and its outer diameter is equal to the outer diameter of the screw. The grooves are divided into groups, each group being a confluence zone of the material. The material is shunted through the groove, converged in the confluence area, and then the shunted confluence. The principle is similar to the pin type. The characteristic of the separation screw is that in addition to the original thread (called the main thread) in the melting section, there is an additional thread (called additional thread) with an outer diameter slightly smaller than the outer diameter. The main thread of the barrel screw, the main and auxiliary threads have different leads. The auxiliary threads start from the end of the feed section (where they are connected to the feed section), and after several threads, gradually intersect with the main thread of the homogenizer. The screw groove depth and pitch of this screw are gradually changed from the beginning of the feed section to the end of the homogenization, that is, the pitch gradually narrows from the width, and the groove depth gradually shallower from the depth, which can compress the material to a greater extent.

China's commonly used barrel screw materials are 45 steel, 40Cr, ammoniated steel, 38CrMOAl, high temperature alloy and so on. 1) No. 45 steel is cheap and has good processing performance, but it has poor wear resistance and corrosion resistance. Heat treatment: quenching and tempering HB220-270. High-frequency quenching HRC45--48.2)40Cr has better performance than 45 steel, but it is often plated with a layer of chromium to improve its corrosion resistance and wear resistance. However, the requirements for chromium plating are relatively high. The coating of the barrel screw is too thin and easy to wear, and too thick and easy to peel off. After peeling will accelerate corrosion, has been rarely used. Heat treatment: quenching and tempering HB220-270. Hard chromium plating HRC>553) nitrided steel, 38CrMoAl has excellent comprehensive performance and is widely used. Generally, the nitrided layer reaches 0.4-0.6mm. However, this material has low resistance to corrosion of related things and is relatively expensive.barrel screwThe high-temperature alloy material is better than other materials. This material does not require a coating,barrel screwThe halogen-free screw is mainly used in injection molding machines. The material has high oxidation and corrosion resistance.

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