Workpiece deformation during turning of sintered parts

Cutting force during machining causes deformation of PTFE products, affecting accuracy. Deformation usually gradually intensifies after demolding of the product, and is more significant especially in parts with asymmetric structures or large wall thickness differences. This problem causes the product dimensions to exceed the tolerance range, affecting assembly accuracy and product function.

(1) Process factor: The rigidity and hardness of PTFE are very low; this factor affects the '2079851475616104453 and final quality of the product. (2) Process factor: The cutting force easily deforms the workpiece; this factor affects the '2079851475616104453 and final quality of the product. (3) Process aspect: Uneven cooling causes shrinkage differences among regions, generating temperature difference stress. (4) Design aspect: Asymmetric structure or uneven wall thickness distribution causes anisotropic shrinkage. (5) Material aspect: Differences in molecular chain orientation or fiber arrangement direction cause different shrinkage in each direction.

(1) Material selection: Use specially designed flexible fixtures or vacuum adsorption fixtures to fix the workpiece, establish material selection evaluation standards, and determine the optimal plan through comparative tests. (2) Material selection: Use extremely sharp tools to reduce the cutting force, establish material selection evaluation standards, and determine the optimal plan through comparative tests. (3) Implementation measure: Perform rough and finish machining in steps, formulate specific operation plans in combination with actual production conditions, and verify the implementation effect. (4) Implementation measure: Reserve finish machining allowance., formulate specific operation plans in combination with actual production conditions, and verify the implementation effect. (5) Preventive measure: Conduct shrinkage and warpage simulation analysis in the product design stage, and optimize the structure and process plan in advance.

Deformation problems originate from internal stress generated by uneven shrinkage or heating of various parts of the product, and need to be systematically solved from three aspects: structural design, process parameters, and post-processing.