| 摘要 |
PROBLEM TO BE SOLVED: To provide the die for Cu hot extrusion, which is excellent in resistance to heat check. SOLUTION: When manufacturing the die 10 for Cu hot extrusion, which is used for the hot extrusion of Cu or Cu alloy extruding base stock, after obtaining an almost columnar base stock 1 made of a sintered compact by the hot isotropic pressure(HIP) of powder base stock, or after obtaining the almost columnar base stock 1 made of an ingot by the solidification of molten metal, the almost columnar base stock 1 is subjected to upsetting forging in the axial direction to make it a board shaped formed base stock 2 on which fiber lines F low in the radial direction. Next, by piercing a hole in the board shaped formed base stock 2, an annular formed base stock 3 having a hollow hole 3a, is made. Further, while holding and pressing the inner peripheral surface and the outer peripheral surface of the annular formed base stock 3 by a pair of forming rolls RA and RB, by rolling the annular formed base stock 3 in the peripheral direction, it is formed to the annular die 10 for Cu hot extrusion, on which the fiber lines F flow in the peripheral direction (that is, the fiber lines F flow in the peripheral direction within a surface crossing orthogonally to the extrusion direction of the Cu or the Cu alloy extruding base stock.) and finish working is performed, if necessary.
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