Selection of press tool materials for tableting machines and a study of their wear behavior

1. The limiting wear at the die hole walls in tableting a citramon preparation of given particle size distribution was equal to 20–25μ. 2. The wear of dies made from grade Kh12M steel was less by a factor of 3 and 2.5 respectively than that of grades 20Kh and KhVG steels. 3. The optimal diametral clearances between the punch caps and the dies for a diameter of 12 mm can be taken as 30–40μ, and between the punch stems and the dies 10–30μ (in order to reduce the spilling of powder). 4. The wear resistence of punches made from the same material as the dies is approximately double that of the dies. 5. The wear of the punch caps depends on the die material, while the wear of the punch stems is independent of the die material.