Material bridging in the mold causes uneven filling

Powder forms arch-shaped bridging during feeding in deep and narrow cavities. 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) Raw material characteristic aspect: Poor powder flowability; the physical characteristics of the powder directly affect the preforming and sintering quality. (2) Raw material characteristic aspect: Large friction between particles; the physical characteristics of the powder directly affect the preforming and sintering quality. (3) Mold aspect: The cavity cross-section changes drastically; the mold structure or state directly affects the flow and molding of the material in the cavity.

(1) Material selection: Use a vibration feeding device to break the bridging, establish material selection evaluation standards, and determine the optimal plan through comparative tests. (2) Design optimization: Optimize the powder particle gradation to improve flowability, combine process simulation analysis or trial mold verification, and continuously iteratively improve the design plan. (3) Implementation measure: Avoid abrupt cross-section changes in cavity design., 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.