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Knowledge of Machining Process of Polyurethane

Views: 189 Update date: Aug 12,2019

polyurethane machiningPolyurethane elastomer, also known as PU elastomer or urethane, is a kind of super wear-resistant (commonly known as best of wear-resistance) with good strength, small permanent compression set. A new kind of material between plastic and rubber has the rigidity of plastic and the elasticity of rubber. At present, it is widely used to replace rubber. There are two existing forms of bar and plate. Polyurethane has excellent machinability. The specific processing steps are as follows:


1) The lathe is mainly used for turning rotating work pieces with turning tools. On the lathe, drills, reaming drills, reamers and other tools can also be used for corresponding processing.


2) Use a sharp steel knife, deep groove, large rear angle, grinding into a circular arc, the center of the knife should be higher than the center of the workpiece, prevent climbing knife, do not high speed, dragging chips in processing.


3) Burr 1. Change the knife. Need the blunt knife 2. Speed regulation. If the speed of bakelite products is too fast, they will be heated to produce burr. The ideal speed is F600-1200.


Dimension 1. When the hydraulic head of CNC lathe clamps the polyurethane elastomer product, there will be deformation due to the pin jacking or clamping, especially in the processing, there will be the problem of big and small head, which requires the hydraulic pressure to be reduced. 2. When CNC (vertical milling machine) fixture is tightened, polyurethane elastomer may cause deformation, or the material will be deformed under stress during processing. Suggestion: Consider using ordinary lathe or milling machine to avoid size deviation.

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