What are the quality standards for choosing the screw of a woven bag pellet machine? How to choose a high-quality screw?
The requirements and manufacturing standards of the woven bag pellet machine are different for different materials. In addition to the aspect ratio, the material used, the processing accuracy, the quenching treatment, the error of the drive shaft and the working shaft surface, etc., are all determined In view of the various performance indicators and service life of the plastic pellet machine, how to choose a high-quality screw? The editor here has sorted out some of the quality consideration standards for the plastic pellet machine screw, and I hope to help you a little bit.
Woven bag granulator
The screw of the plastic pellet machine needs to be made of alloy steel with small thermal deformation, wear resistance and corrosion resistance. Commonly used materials are 38CrMoAIA alloy steel or 40Cr steel, and repair parts can also be made of 45# steel.
The screw material blank should be formed by forging method.
After the screw is mechanically processed, the outer circle accuracy should reach the 8-level precision quality requirement.
The concentricity error between the working shaft surface of the screw rod and the connecting part of the drive shaft and the screw thread outer circle should not be greater than 0.01mm.
The working surface roughness Ra value of the thread part of the screw: the two sides of the thread should not be greater than 1.6 microns, and the bottom and outer circle of the thread should not be greater than 0.8 microns.
If the screw is made of low-carbon alloy steel, in order to improve the hardness and corrosion resistance of the threaded working surface, the thread surface should be nitrided, the depth of the nitrided layer is 0.3-0.6mm, and the surface hardness is 700-840HV. The brittleness is not more than level 2.
The connection of the screw inner hole shall be subjected to a 0.3Mpa water pressure test, and no water leakage is allowed for 5 minutes. Through the comprehensive measurement of the above seven aspects, I believe you will be able to purchase the high-quality woven bag pellet machine screw suitable for you.