发明授权
- 专利标题: Methods and apparatus for manufacturing seamless tube
- 专利标题(中): 无缝管制造方法及装置
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申请号: US137463申请日: 1987-12-23
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公开(公告)号: US4928507A公开(公告)日: 1990-05-29
- 发明人: Karlhans Staat , Hermann Moltner
- 申请人: Karlhans Staat , Hermann Moltner
- 申请人地址: DEX
- 专利权人: Kocks Technik GmbH & Co.
- 当前专利权人: Kocks Technik GmbH & Co.
- 当前专利权人地址: DEX
- 优先权: DEX3432288 19840901
- 主分类号: B21B9/00
- IPC分类号: B21B9/00 ; B21B19/02 ; B21B19/04 ; B21B19/06 ; B21B25/04 ; B21C1/26 ; B21C37/06
摘要:
Ingots hot from rolling are pierced to form a hollow ingot by means of an internal tool of a press or skew-rolling line, and are subsequently elongated to form a tubular bloom by a stretching unit provided with a mandrel rod, and are finally finish-rolled. When inserting or withdrawing the internal tool into or out of the hollow ingot or the mandrel rod into or out of the tubular bloom, inert gas is introduced into the freed interior space in order to prevent scaling of the interior wall of the tubular bloom.
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