The wall thickness of this part is too thin and the inner hole has the requirement of roundness. It is necessary to strictly control the tool speed, cutting quantity and reasonable CNC JIG, to effectively release the internal stress of the material by using the tool helix force in the cutting process.

Eliminate the internal stress of several kinds of methods: one is the heat treatment was carried out on the object (for polymer materials such as metal material artifacts) the second is on the natural conditions to eliminate (i.e., natural aging stress relief) three is eliminated by tapping in the form of vibration and four is by ultrasonic impact shock to optimize stress, or change the direction of stress

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