Explanation

The blank without sintering obtained by pressing powder during powder forming. The properties of billet include density, strength, etc. density depends on such factors as forming method, pressing pressure, powder performance, lubricant, die structure and surface finish. The strength of the billet mainly depends on the mechanical meshing between powder particles and the bonding force between surface metal atoms. In addition to the impact of density and strength on the performance of the finished product, various defects will also greatly reduce the performance of the finished product, or even make it a waste product. Common pressing waste products include delamination, crack, edge drop, scratch, coaxiality deviation, etc. Qualified finished products can be obtained only if the shape, size, density and strength of qualified green billets meet the requirements and there are no above defects

Classification