Abstract: To provide a lubricant for metallic material working and a method of press working a metallic material that makes it possible to improve the working accuracy of a press worked product and prolong the life of the die assembly beyond prior levels of life. [Solution] A lubricant for metallic material working comprises a mixture of a sulfur-based extreme pressure agent, an organic zinc compound, a calcium-based additive, and an ester compound, with lubricant base oil. The sulfur-based extreme pressure agent has a sulfur content of 5% by weight or higher based on the total weight of the lubricant. The organic zinc compound has a zinc content of 0.5% by weight or higher based on the total weight of the lubricant. The calcium-based additive has a calcium content of 0.5% by weight or higher based on the total weight of the lubricant. And the ester compound occupies a content of 1.0% by weight or higher based on the total weight of the lubricant.

Abstract: A movable punch punches a plate piece from an original material sheet. The punched plate piece is rotated relative to and laminated onto another plate piece. A plurality of projections are formed on the outer circumference of each plate piece. The movable punch has a plurality of projection forming blades, the number of which is greater than the number of the projections of the plate pieces. Prior to the punching of the plate piece by means of the movable punch, blank holes for nullifying the formation of the projections are formed in the original material sheet at positions that correspond to projection forming blades. Further, as the punching of the plate pieces from the original material sheet progresses, the positions of the blank holes are changed.

Abstract: A movable punch punches a plate piece from an original material sheet. The punched plate piece is rotated relative to and laminated onto another plate piece. A plurality of projections are formed on the outer circumference of each plate piece. The movable punch has a plurality of projection forming blades, the number of which is greater than the number of the projections of the plate pieces. Prior to the punching of the plate piece by means of the movable punch, blank holes for nullifying the formation of the projections are formed in the original material sheet at positions that correspond to projection forming blades. Further, as the punching of the plate pieces from the original material sheet progresses, the positions of the blank holes are changed.

Abstract: [Object] To provide a lubricant for metallic material working and a method of press working a metallic material that makes it possible to improve the working accuracy of a press worked product and prolong the life of the die assembly beyond prior levels of life. [Solution] A lubricant for metallic material working comprises a mixture of a sulfur-based extreme pressure agent, an organic zinc compound, a calcium-based additive, and an ester compound, with lubricant base oil. The sulfur-based extreme pressure agent has a sulfur content of 5% by weight or higher based on the total weight of the lubricant. The organic zinc compound has a zinc content of 0.5% by weight or higher based on the total weight of the lubricant. The calcium-based additive has a calcium content of 0.5% by weight or higher based on the total weight of the lubricant. And the ester compound occupies a content of 1.0% by weight or higher based on the total weight of the lubricant.

Abstract: A programmable controller for controlling line assembly machines includes first and second CPUs for cyclic execution of a user program stored in user memories. Execution cycles of one of the two CPUs are synchronized to those of the other by means of a synchronization signal such that simultaneous accesses to the input/output bus do not take place. After booting, the second CPU is synchronized to the first. When the two CPUs enter into execution cycles of the user program, an abnormally functioning CPU is temporarily halted, and thereafter the execution cycles of such CPU is synchronized to those of the normally functioning CPU.