Maintenance method and matters needing attention of plastic
TIME: 2019-06-19
Plastic extruder barrel wear is the primary performance in the use of the process of wear, resulting in an increase in the inner diameter of the barrel diameter, because the outer surface of the barrel hardness is higher than the screw, the damage of the barrel than the screw to late. The following matters should be paid attention to in the maintenance method and repair process of machine barrel:
1, the barrel due to wear add diameter, if there is a certain nitriding layer, can be the barrel inner hole directly bore grinding, get a new diameter scale, and then according to the new diameter to make a new screw.
2. After machining, the inner diameter of the cylinder is modified and cast the alloy again, and the thickness is controlled within 1~2mm, and then the alloy is refined to the necessary new scale.
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3, under normal circumstances, the uniform section of the machine cylinder wears faster than other locations, can be homogenized section boring dressing, with a nitriding alloy steel liner, the diameter of the inner hole refers to the screw diameter, stay in the normal fit gap, for processing and manufacturing.
4, screw and barrel manufacturing data
At present, the commonly used materials of screw and barrel manufacturing in China include 45, 40Cr and 38CrMoAlA, while the commonly used alloy steel materials of screw and barrel manufacturing in imported extruders include 34CrAINi7 and CrMoV9, whose yield strength is about 900MPa. After nitriding treatment, not only wear resistance, but also excellent corrosion resistance, hardness above 1000HV.