At present, China commonly used Threaded Rod Din975 mat […]
At present, China commonly used Threaded Rod Din975 materials, including 45 steel, 40Cr, ammoniated steel, 38CrMOAl, high temperature alloys. The following describes the screw material information. 45 steel cheap, good processing performance, but the use of the material of the threaded rod din975 wear resistance of poor corrosion resistance. 40Cr performance is better than 45 steel, but often to be coated with a layer of chromium, in order to improve the corrosion resistance of the screw wear resistance. But the higher requirements of the screw chrome layer, the coating is too thin easy to wear, too thick is easy to peel off, but after the spill corrosion, has been less applied.
Nitrided steel, 38CrMoAI comprehensive performance is relatively good, more widely used. General nitride layer of 0.4-0.6mm. But the use of this material screw resistance to hydrogen chloride corrosion is low, and the screw price is higher. High temperature alloy material is superior to other materials, the material without plating, mainly used for injection molding machine screw, the use of materials, anti-oxidation of the screw corrosion resistance.
Foreign useful titanium carbide coating method to improve the corrosion resistance of the threaded rod din975 surface, but it is reported that its wear resistance is not good enough. Abroad to improve the wear resistance of the screw corrosion resistance has taken a series of measures. One way is to use a highly wear resistant corrosion resistant alloy steel. Such as 34CrAlNi ,, 31CrMo12 and so on. Also take the method of spraying Xaloy alloy on the surface of the screw. This Xaloy alloy has a high wear resistance and corrosion resistance.
Threaded rod din975 is generally due to long-term wear, the screw and the cylinder gap is too large can not be properly squeezed out of retirement, but also due to improper design or operation of the work stress exceeds the strength limit and destruction of the example. Therefore, the screw should also meet certain strength requirements. Screw for plastic molding equipment, such as plastic profiles extruder, injection molding machines. Screws and barrels are the core of plastic molding equipment. Is heated and extruded into plasticized parts. Is the core of plastic machinery.