Uneven density

The density varies greatly among different parts of the product. Density differences are obvious between different parts of the product, affecting the consistency of the overall performance of the product.

(1) Raw material characteristic aspect: Uneven powder filling during preforming; the physical characteristics of the powder directly affect the preforming and sintering quality. (2) Mold aspect: Powder bridging at the deep cavity part of the mold causes insufficient local filling; the mold structure or state directly affects the flow and molding of the material in the cavity. (3) Pressure parameter aspect: Uniaxial pressing causes pressure transmission attenuation; improper pressure control directly affects the compactness and molding quality of the product.

(1) Design optimization: Optimize the feeding method to ensure uniform filling, combine process simulation analysis or trial mold verification, and continuously iteratively improve the design plan. (2) Implementation measure: Adopt bidirectional pressing or isostatic pressing molding, formulate specific operation plans in combination with actual production conditions, and verify the implementation effect. (3) Implementation measure: Use vibration-assisted feeding for complex shapes., formulate specific operation plans in combination with actual production conditions, and verify the implementation effect. (4) Preventive measure: Establish a raw material batch inspection system, regularly sample and test product density and mechanical properties, and establish quality trend analysis.

The essence of uneven density is inconsistent distribution or densification of the material during the '2079851475616104453, and the feeding method and pressure transmission need to be optimized.