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1. 发明专利

JPS58221624A Necking method of pipe 失效
标题翻译：管接头方法
公开(公告)号：JPS58221624A
公开(公告)日：1983-12-23
申请号：JP10567482
申请日：1982-06-18
申请人： Sumitomo Metal Ind Ltd
发明人： NISHIGUCHI MASARU , FUKUYASU TOMIHIKO , TANI TAKAYUKI , HAMADE HIROYUKI
IPC分类号： B21D41/04 , B21K21/12
CPC分类号： B21D41/04 , B21K21/16
摘要： PURPOSE:To reduce a pipe in diameter while forming a sufficiently thick shoulder part without buckling by performing diameter reduction by rotary casting after increasing the thickness of a pipe end part axially toward an internal diameter side, and then performing axial upsetting work. CONSTITUTION:A tubular material 4 heated up to about 1,250-1,150 deg.C is held by a half die 51 and intruded into a punch 61 from a pipe end, and axial upsetting work is carried out by a half die 52 and a punch 62 to form a thick part 7 on an internal diameter side at a specific distance l' from the pipe end. The blank material 4 is cast by using a tap 11 while rotated to reduce the material from the pipe end to the thick part 7 within a specific range to a specific external diameter. Then, axial upsetting work is performed by a half die 54 and punch 63 and the material 4 of the diameter-reduced parallel part elongated by said rotary casting is moved axially and an underfill part 8 is supplemented to make the shoulder part of the diameter-increased part sufficiently thick; and the reduced part is increased in diameter slightly toward the internal-diameter part slightly.
摘要翻译：目的：通过在将管端部的厚度向轴向向内径侧增加之后，通过旋转铸造进行直径减小而形成足够厚的肩部而没有弯曲，从而减小直径的管，然后进行轴向镦锻。构成：加热到约1,250-1,150℃的管状材料4由半模51保持，并从管端侵入冲头61中，轴向镦锻工作由半模52和冲头62 在内径侧形成距离管端特定距离l'的厚的部分7。坯料4通过使用龙头11进行铸造，同时旋转以在特定范围内将材料从管端减小到特定的外径。然后，通过半模54和冲头63进行轴向镦锻作业，并且通过所述旋转铸造件延长的直径减小的平行部分的材料4轴向移动，并且补充底部填充部分8以使直径 - 增加部分足够厚; 并且减少的部分稍微向内径部分略微增加。

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