Method of cold drawing sheet metal

Claim 1

IN THE COLD DEEP DRAWING OF STEL SHEETS BY MEANS OF DIES, THE STEPS OF PROVIDING A THIN CHEMICALLY ADHERENT COATING OF ZINC PHOSPHATE ON A QUANTITY OF SAID SHEETS, APPLYING TO SAID QUANTITY OF SHEETS, A NON-PIGMENTED LUBRICANT CONTAINING A HIGH FATTY ACID RADICAL WHICH CHEMICALLY REACTS WITH SAID COATING, COLD DEEP DRAWING SAID QUANTITY OF SHEETS BY THE USE OF DIES WHEREBY THERE IS TRANSFERRED FROM SAID SHEETS TO SAID DIES AS THE DEEP DRAWING IS EFFECTED MATERIAL WHICH INCLUDES AT LEAST SOME OF THE PHOSPHATE COATING MATERIAL AND SOME OF THE PRODUCT OF SAID REACTION, APPLYING TO A SMALLER QUANTITY OF UNCOATED STEEL SHEETS A NON-PIGMENTED LUBRICANT OF THE SAME TYPE AS APPLIED TO THE COATED SHEETS, AND COLD DEEP DRAWING SAID SECOND SMALLER QUANTITY OF SHEETS BY THE USE OF THE SAME DIES, THE LUBRICANTS BEING SELECTED FROM THE GROUP CONSISTING OF APPROXIMATELY ONE PER CENT SODIUM SOAPNINETY-NINE PER CENT WATER; APPROXIMATELY TWO PER CENT SULPHONATED TALLOW-NINETY-EIGHT PER CENT WATER, THE PH OF THE LUBRICANT BEING APPROXIMATELY 8; APPROXIMATELY ONE PER CENT CHLORINATED PARAFFIN, FORMING AN EMULSION WITH APPROXIMATELY TWO PER CENT SODIUM SOAP USING APPROXIMATELY NINETY-SEVEN PER CENT WATER.