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News Center

Zhejiang Guangming Plastics Machinery Co., Ltd.

08

2018-08

Screw repair and strengthening process steps

The repair and strengthening of the screw is as follows: 1. Surface cleaning Before the screw spray welding, the plastic attachments remaining on the surface of the screw should be cleaned up. The cleaning method is to install the screw on the spraying machine and rotate it with spray

2018-08-08

02

2018-08

Extruder screw planning considerations

The extruder barrel is filled with plastic and closely matched with the screw. For normal operation, the following important characteristics should be noted. 1. Screw barrel shall be straight. 2. The planning of the screw barrel should be able to enjoy the working pressure of the extruder. These pressures may be as high as 70-140MPa(10000-20000psi), and even higher in injection molding. 3. The inner wall surface of the screw barrel should be more wear-resistant than the extruder screw, because the screw is easier to replace than the screw barrel, and the reprocessing is cheaper than the screw barrel. 4. The support at the rear end of the screw barrel shall be a sliding support, which shall expand when the screw barrel is heated. Rigid support will cause bending of the screw barrel, which may

2018-08-02

01

2018-08

Common materials for screw

At present, China's commonly used 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 its wear resistance and corrosion resistance are poor. Heat treatment: quenching and tempering HB220-270, high frequency quenching HRC45--48. 2) The performance of 40Cr is better than that of 45 steel, but it is often plated with a layer of chromium to improve its corrosion resistance and wear resistance. However, the requirements for the chromium plating layer are high, the coating is too thin and easy to wear, too thick is easy to peel off, but accelerated corrosion after peeling, has been less application. Heat treatment: quenching and tempering HB220-27

2018-08-01

01

2018-08

What are the requirements for the manufacturing quality of the screw

What are the requirements for the manufacturing quality of the screw? ① The screw of the extruder should be made of alloy steel with small thermal deformation, wear resistance and corrosion resistance. Commonly used materials are 38CrMoAlA alloy steel or 40Cr steel, repair parts can also be made of 45 steel

2018-08-01

31

2018-07

Zhoushan screw wear solution

Screw is mostly used in plastic molding equipment, such as plastic profile extruders, injection molding machines, etc. Screw and barrel are the core components of plastic molding equipment, the part of heating extrusion plasticization, and the core of plastic machinery. The protection of the screw became the primary problem.

2018-07-31

31

2018-07

Factors Affecting the Quality of Screw Plasticization

The main factors of rod plasticizing quality are: aspect ratio, compression ratio, back pressure, screw speed, barrel heating temperature, etc. 1. Length-diameter ratio: the ratio of the effective working length of the screw to the diameter of the screw. A, large aspect ratio is easy to eat evenly;

2018-07-31

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