Heating rate too fast

Fast heating during sintering causes product defects. 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) Gas removal aspect: Heating too fast causes the surface to shrink first and seal the gas escape channels; gas retention forms internal defects affecting the compactness of the product. (2) Gas removal aspect: Internal gas expands and generates internal pressure; gas retention forms internal defects affecting the compactness of the product. (3) Temperature parameter aspect: Temperature lag causes a large temperature difference between the inside and outside; temperature deviations directly affect the physical and chemical state of the material and the reaction process.

(1) Implementation measure: Adopt a staged heating program, formulate specific operation plans in combination with actual production conditions, and verify the implementation effect. (2) Implementation measure: Slow down the heating rate for thick-walled parts (e.g., <60℃/h), formulate specific operation plans in combination with actual production conditions, and verify the implementation effect. (3) Implementation measure: Slow down the speed at critical temperature sections (e.g., when PTFE is at its melting point of 327℃)., 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.