Injection molding machine screw barrel routine maintenance

For the manufacture of barrels, the commonly used materials in China are 45, 40Cr and 38CrMoAIA. The material used to manufacture the barrel in the imported extruder is commonly used alloy steel 34CrAINi and CrMoV9. The yield strength of this material is about 900MPa. After nitriding treatment, the hardness is above 1000HV, which is both wear-resistant and corrosion-resistant. Tungsten carbide alloy barrel, tungsten carbide alloy + chromium alloy barrel, tungsten carbide alloy + chromium alloy + nickel alloy barrel, use Material high-quality alloy steel as the base material, and cast the above alloy in the inner hole to improve the wear resistance of the barrel. Corrosion resistance.
Barrel daily maintenance
1. When the barrel screw does not reach the preset temperature, do not start the machine.
2. Prevent metal fragments and debris from falling into the hopper. If processing recycled materials, a magnetic hopper must be added to prevent iron filings from entering the barrel.
3. When using the anti-spill, make sure that the plastic in the barrel is completely melted, so as not to damage the transmission system parts when the screw moves back.
4. When using new plastic, the rest of the barrel should be cleaned.
5. When the temperature of the molten plastic is normal but black spots or discoloration of the injection molding product are continuously found, check whether the screw rubber head, rubber ring, and plastic meson are worn. .
6. When the product is injection molded, try to make the material plasticized evenly, so as to reduce the transmission torque on the screw and increase its service life.