Insufficient preforming pressure

Excessively low blank density leads to large shrinkage and insufficient strength after sintering. 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) Pressure parameter aspect: Insufficient press tonnage or the set pressure is relatively low, causing the material to fail to fully fill or to be insufficiently densified, and the product density and bonding strength decrease. (2) Pressure parameter aspect: Incorrect mold area calculation causes insufficient unit pressure, causing the material to fail to fully fill or to be insufficiently densified, and the product density and bonding strength decrease. (3) Raw material characteristic aspect: Insufficient powder filling height; the physical characteristics of the powder directly affect the preforming and sintering quality.

(1) Implementation measure: Confirm the required preforming pressure (PTFE usually 20-40MPa), formulate specific operation plans in combination with actual production conditions, and verify the implementation effect. (2) Implementation measure: Calculate the mold area to match the press capacity, formulate specific operation plans in combination with actual production conditions, and verify the implementation effect. (3) Implementation measure: Ensure that the powder filling amount is sufficient., 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.