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US 5,076,339 AGranted
Solid lubricant for die casting process
OwnerJohn J. Smithinventor
Life of this patent
Estimating the term…
Abstract
The present invention resides in a die casting process using a solid lubricant composition. The lubricant composition preferably comprises (a) about 30% to about 70% by weight of a high melting point synthetic wax having a melting point in the range of about 270.degree. F. to about 310.degree. F. (132.degree.-154.degree. C.); (b) about 10 to about 50% by weight of a wax having a lower melting point in the range of about 150.degree. F. to about 250.degree. F. (65.degree.-121.degree. C.).
Claims9
A die casting method comprising the steps of
- placing a solid plunger lubricant into a chamber of a shot sleeve of a die casting machine, said chamber having a high temperature from prior operation of said machine, said lubricant melting upon contact with the shot sleeve;
- pouring molten metal into the chamber of said shot sleeve, and
- forcing the molten metal and the molten lubricant into a die cavity by movement of a plunger through the chamber of said shot sleeve, said solid plunger lubricant being at least 40% wax having a melting point below the temperature of said chamber.
A die casting method comprising the steps of
- pouring molten metal into a chamber of a shot sleeve of a die casting machine, said chamber having a high temperature from prior operation of said machine;
- forcing the molten metal into a die cavity of the die casting machine by movement of a plunger through the chamber of the shot sleeve;
- exhausitn gases from the die cavity as the molten metal is forced into the die cavity;
- prior to pouring molten metal into the chamber of the shot sleeve placing individual pieces of a solid plunger lubricant in the chamber of the shot sleeve, said solid plunger lubricant being at least 40% wax having a melting point below the temperature of said chamber;
- melting said individual pieces of solid plunger lubricant in the chamber of the shot sleeve to create a lubricant coating on surface portions of the shot sleeve;
- forcing some of the lubricant coating into the die cavity by movement of the plunger in the chamber of the shot sleeve and by movement of the molten metal into the die cavity;
- and
- exhausting gases created in the melting of the solid lubricant from the die cavity.
5 more elements
Dependencies are inferred from the claim text.