摘要:
A lubricating composition for use in the isothermal forging or sizing of metal workpieces in a hot die, comprises more than 50%, preferably 85 to 99% by weight of a vitreous component which fuses at a temperature above 500°F and below the temperature of the hot die during forging and less than 50%, preferably 15 to 1%, by weight of a finely divided abrasive component having a melting point above 2000°F, a hardness at room temperature of from 5.5 to 10.0 Mohs, and a particle size of from 1 to 75 microns, the abrasive component being non-reactive with the metal workpiece and the die at forging temperatures. Such a composition is applied to the workpiece prior to forging in the form of a precoat composition.
摘要:
For the purpose of lubricating a cavity, particularly an annular cavity in a tool for forging blanks produced by powder metallurgy, a lubricant spray is directed towards a limited portion of the cavity surface and the nozzle is displaced such that impingement area of the spray against the cavity sweeps over the entire surface of the cavity. The impingement surface of the lubricant spray is adapted to cover the radial extension of the annular cavity, the nozzle being displaced along the periphery of the cavity. An apparatus for carrying out the method includes a carrier (10) with a mounting (11) for a swinging arm (12) carrying a spray nozzle (14). The carrier (10) is adapted for being positioned for mounting of the arm coaxial with the axis of the cavity, the arm (12,13) being arranged for positioning the nozzle (14) over a peripheral portion of the cavity. Means (31) are arranged for causing the nozzle (14) to circulate along the periphery of the cavity.