Excessive internal stress

The product has residual internal stress, and cracking and deformation occur during subsequent processing or use. This problem is relatively common in sintering molding production and needs to be comprehensively analyzed and solved from multiple aspects of material, process, and equipment.

(1) Temperature parameter aspect: Excessively fast cooling speed causes an excessively large temperature gradient between the inside and outside of the product, generating thermal stress; temperature deviations directly affect the physical and chemical state of the material and the reaction process. (2) Temperature parameter aspect: Uneven sintering temperature causes crystallinity differences in different parts; temperature deviations directly affect the physical and chemical state of the material and the reaction process. (3) Material aspect: Fluctuations in raw material performance indicators or insufficient pretreatment affect molding quality. (4) Process aspect: Deviations in the control of key process parameters cause the '2079851475616104453 to deviate from optimal conditions. (5) Equipment aspect: Equipment accuracy and maintenance status affect the stable execution of process parameters.

(1) Implementation measure: Adopt a slow and controllable cooling rate (PTFE recommended ≤50℃/h), formulate specific operation plans in combination with actual production conditions, and verify the implementation effect. (2) Post-processing: Anneal by holding above Tg to release stress, formulate a reasonable post-processing temperature curve, eliminate internal stress and stabilize product dimensions. (3) Implementation measure: Avoid sudden cooling., formulate specific operation plans in combination with actual production conditions, and verify the implementation effect. (4) Preventive measure: Establish a sound process control standard and quality inspection system, and regularly review process data for continuous optimization.

This problem needs to be comprehensively analyzed from multiple dimensions of material, process, equipment, and operation, and solved by systematically optimizing process parameters and the quality control system.