Challenges in PU rubber machining

There are challenges in machining of PU materials：

- Material Adhesion:
PU Rubber has high elasticity and a low melting point. During cutting, it tends to soften due to frictional heat, adhering to the tool edge or workpiece surface. This causes rough machining surfaces and dimensional deviations.

- Workpiece Deformation and Vibration:
With low hardness (mainly Shore A 50-95), the material is prone to deformation under clamping force. High-speed cutting may also trigger elastic rebound and vibration, affecting flatness and cylindricity.

- Burrs/Tearing on Machined Surfaces:
Excessively high cutting speed or dull tool edges fail to cut the material smoothly, leading to tearing and burrs. This issue is more noticeable on end faces and steps.

- Difficulty to Controll Dimensional Accuracy:
PU Rubber exhibits slight shrinkage or rebound after machining. Combined with unstable cutting depth caused by tool adhesion, key dimensions such as diameter and length are likely to exceed tolerances.

- Rapid Tool Wear:
The material contains fillers of certain hardness, and its viscosity increases cutting resistance. This results in rapid blunting of the tool edge, further exacerbating adhesion and surface quality issues.