| 发明名称 | Hot upset forging method | ||
| 摘要 | Provided is a hot upset forging method enabling high shape precision to be obtained. The hot upset forging method includes inserting a workpiece (1), with a bottom face diameter d and a height h satisfying h/d>3, into an insertion hole provided passing through a mold (2) of a height H disposed on an anvil (4), and increasing the diameter of the workpiece (1) while decreasing the height of the workpiece (1) to form a forged material. The mold satisfies the following relationships (1) to (3). (1) A shape of the insertion hole and the cross-sectional shape of the workpiece are substantially similar shapes. (2) The height h of the workpiece (1)≦the height H of the mold (2). (3) A largest diameter dl of the workpiece 1, and the maximum inner diameter D of the insertion hole, in the height range of the workpiece (1), satisfy dl<D≦dl×1.5. | ||
| 申请公布号 | US9427793(B2) | 申请公布日期 | 2016.08.30 |
| 申请号 | US201314372753 | 申请日期 | 2013.01.23 |
| 申请人 | HITACHI METALS, LTD. | 发明人 | Toga Takashi;Matsumoto Hideki;Shigihara Yusuke |
| 分类号 | B21J5/08;B21J5/02;B21J13/02;B21J1/04;B21J9/06 | 主分类号 | B21J5/08 |
| 代理机构 | SOLARIS Intellectual Property Group, PLLC | 代理人 | SOLARIS Intellectual Property Group, PLLC |
| 主权项 | 1. A hot upset forging method comprising: inserting a workpiece consisting of an alloy, with a bottom face diameter d and a height h satisfying h/d>3, into an insertion hole provided passing through a mold of a height H disposed on an anvil; and increasing a diameter of the workpiece while decreasing the height of the workpiece to form a forged material, wherein the mold satisfies the following relationships (1) to (3): (1) a shape of the insertion hole and a cross-sectional shape of the workpiece are substantially similar shapes; (2) the height h of the workpiece≦the height H of the mold; and (3) a largest diameter dl of the workpiece, and a maximum inner diameter D of the insertion hole, in a height range of the workpiece, satisfy dl<D≦dl×1.5, and wherein a chamfered portion is formed at from 5 mm to 30 mm from an end portion of the bottom face of the workpiece, and wherein a tapered portion, having an increasing diameter in a height direction such that an angle of the tapered portion is 3° or less from vertical, is formed at the insertion hole provided at the mold. | ||
| 地址 | Tokyo JP | ||