For casting stamps in the workshop, you should have two melting baths: one for zinc, the other for lead.
In non -working hours, the baths should be covered with lids in order to avoid the hit of foreign objects and moisture and pollution. It is especially necessary to ensure that a zinc with lead does not mix, since when casting the matrix, lead, due to a large specific grade, will settle on its front side, which when stamping leads to the formation of dents on the matrix.
Zinc is poured into a mold at a temperature of about 500 °. This temperature provides sufficient density and fine -grained matrix structure. The shrinkage of the reference plane when pouring, then filled with zinc until the smooth surface necessary for installing the matrix on the hammer table. The matrix after cooling and removal from the form is cleaned and brought in various circles using pneumatic machines.
Poinson casts from a lead alloy with a teds, which is previously surrounded by wooden or cast -iron gravity as it is done when casting a gypsum model. The welding of a liquid lead to the zinc matrix is eliminated by lubrication of the mirror by the latter graphite or its soot coating with a burner.
Since the weight of medium and large stamps is significant, and the lead is soft material, it is impractical to drill holes in the punch and cut the threads for fasteners for fasteners. To keep the poanson on the woman, you need to close the bolts in it. After pouring the shape of a lead into liquid metal, the bolts are inserted down with the heads, which are placed using the template so that their axes coincide with the fasteners in the hammer of the hammer.
After cooling the punch, the outskirts are disassembled and at the same time on the punch and on the matrix, transverse risks are made, which, when installing the stamp on the hammer, facilitate the centering of one half of the stamp for the other. After branding, the punch and the matrix are distinguished and cleaned by the mirrors with their pneumatic hand machine.