News Center

News Center

Zhejiang Guangming Plastics Machinery Co., Ltd.

19

2021-03

Influencing factors of service life of barrel screw

When the barrel screw operates in a relatively harsh environment, the temperature is generally above 200°C. The barrel screw should not only accept high pressure, but also accept the abrasive effect of the melt and the frequent load starting during pre-molding, and also accept great pressure and torque during the operation. The planning, material selection, exterior metal plating such as Cr, Ni, nitriding, spraying or spray welding hardening alloy, as well as materials (such as plastic particle size, masterbatch function) and operation (speed, back pressure, etc.) will affect the service life of the barrel screw. It can be seen that the service life of the barrel screw is mainly related to the raw material of the screw, especially the various appearance processing technologies.

2021-03-19

04

2021-03

Introduction to the method of reducing wear of the barrel screw

The wear of the barrel screw caused by calcium carbonate is mainly abrasive wear. In order to reduce the production cost of profiles and aggregates, more and more calcium carbonate is used in the formula, especially when the amount of additives is large, the content and quality of calcium carbonate have a great influence on the wear degree of the barrel screw. Unreasonable amount of lubricant in the formulation (excessive external lubricant, such as organic wax or stearic acid) will slow down the plasticization process and accelerate the wear process. Care should be taken to minimize damage to the equipment.

2021-03-04

24

2021-02

Processing technology requirements of screw barrel

It is necessary for the screw barrel to meet the following requirements: high temperature resistance, no deformation at high temperature; wear resistance, long life; corrosion resistance, corrosive materials; high strength, acceptable large torque, high speed; good cutting processing Function; small residual stress after heat treatment, small thermal deformation, etc. The screw barrel shall be made of corrosion-resistant and wear-resistant alloy steel. The roughness Ra value of the thread part of the screw barrel is not more than 1.6um on both sides of the thread, and not more than 0.8/um on the bottom groove surface and outer circle of the thread.

2021-02-24

20

2021-02

What are the application advantages of alloy screw?

Alloy screw is a very important means to increase the service life of mechanical parts, it uses ordinary metal materials as the matrix, and the working surface of the mechanical parts uses high-speed ion spray welding double alloy process, combined with another layer of special alloy, to improve the wear resistance, corrosion resistance and other properties of the parts, increase the service life of the parts.

2021-02-20

02

2021-02

Matters needing attention in the processing of alloy screw

Alloy screw, also known as bimetallic screw, its main material is composed of two different metals, the advantage is to use economic processing, to achieve high economic benefits. Alloy screw temperature can not exceed 400 ℃ (including thread). Otherwise, it will reduce the hardness and wear resistance of the screw; clean the alloy screw with a wire brush, and polish the surface of the screw with emery cloth (sand grade 240~280); burn the residual material on the internal thread with flame (left-handed thread), and then carefully clean the thread with a wire brush.

2021-02-02

15

2021-01

Brief Introduction of Cooling Process in the Process of Alloy Screw

The homogenization section of the alloy screw is cooled because the melt in this section generates more heat and the temperature rises faster due to the large extrusion, friction and shear effects. In order to prevent the material from decomposing, it needs to be cooled. When extruding materials, it is necessary to cool the alloy screw, mainly to ensure the smooth production and prevent the material from decomposing due to the high plasticizing temperature.

2021-01-15

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