Hammer and Rod Mills

Hammer and rod mills are used in the P/M industry to mill large quantities of sinter cakes, which are intermediate products in the production of metal powders by reduction of their oxides. If such powders are to be used in conventional P/M parts processing, it is essential that they possess good green strength and compressibility characteristics. For these reasons, the sinter cakes must be ground into powder, typically -80 mesh, while introducing minimal cold work and densification. Hammer and rod mills with built-in screens or other separation devices are best suited to achieve these properties. Figure 29 shows the blocky particle shape of a copper powder produced by hammer milling of a porous sinter cake.

Fig. 29 Particles (+8 mesh) of copper powder hammer milled from oxide-reduced sinter cake. Courtesy of SCM Metal Products

0 0

Post a comment