| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method for an extruding dice capable of working a bearing hole, a back run-off part and a fine slitting part highly in precision and efficiency. SOLUTION: This manufacturing method of an extruding dice has a working process to form a bearing surface by a wire electrode travelling in the vertical direction of a front surface of the dice, a working process to form a back run-off part by a wire electrode travelling in a direction inclined by a small angle with the aforementioned vertical direction and a working process to form a fine slitting part at a position equal to bearing length at a part of the back run-off part, and the working process of the fine slitting part is carried out by rough working to form the whole of the fine slitting part and finish working to work a portion in the neighbourhood of the bearing surface of the fine slitting part by a discharge working electrode to rotate around an axis, having a cylindrical surface on an outer periphery and having a flat surface orthogonal with the aforementioned axis on a free end.
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