发明授权
- 专利标题: Steam generator tubesheet face machining apparatus
- 专利标题(中): 蒸汽发生器管板加工装置
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申请号: US61227申请日: 1979-07-27
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公开(公告)号: US4362447A公开(公告)日: 1982-12-07
- 发明人: Frank M. Pekar , Frank W. Cooper, Jr.
- 申请人: Frank M. Pekar , Frank W. Cooper, Jr.
- 申请人地址: PA Pittsburgh
- 专利权人: Westinghouse Electric Corp.
- 当前专利权人: Westinghouse Electric Corp.
- 当前专利权人地址: PA Pittsburgh
- 主分类号: B23B3/26
- IPC分类号: B23B3/26 ; B23C3/00 ; F22B37/00 ; B23C1/20 ; B23B3/22 ; B23F21/03
摘要:
An adjustable face milling cutter is carried on a turntable rotatable about a central axis that is coaxial with the cylindrical shell of the steam generator in which the tubesheet is located, to machine a circular path on the upper tubesheet surface. For complete circle-by-circle scanning of the tubesheet surface, the radius of the circular machined path is variable by virtue of mounting the milling cutter on the outer periphery of a circular mounting member turnable to different locked rotary positions about an off-center pivot axis on the turntable. The rotary support for the turntable is at its outer periphery, as provided by an encircling support ring which in turn is supported by a ball bearing assembly having an inner race secured to the turntable top and an outer race secured to the support ring top; teeth on the inner race being provided to accommodate a motor-operated drive gear. The support ring is centered in the steam generator shell by jack screws and is supported by such shell via a circular array of support lugs welded to the inner wall of such shell.