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公开(公告)号：US4649728A
公开(公告)日：1987-03-17
申请号：US726208
申请日：1985-04-23
摘要： A method of fabricating a tube having enlarged ends and made of material which can be strengthened by cold working comprises fabricating a pre-form having the overall configuration of the tube but with increased outside diameters and a decreased length. The pre-formed tube is cold forged or cold rolled over its entire length to reduce its outside diameter while maintaining its inside diameter substantially fixed. This elongates the tube and reduces its cross-sectional area. Cold working is continued until the final desired dimensions for the tube are reached. This produces a strengthening effect by cold working over the entire length of the tube.
摘要翻译： 制造具有扩大端部并由可通过冷加工加强的材料制成的管的方法包括制造具有管的总体构型但具有增加的外径和减小的长度的预成型件。 预成形管在其整个长度上被冷锻或冷轧以减小其外径，同时保持其内径基本固定。 这使管延长并减小其横截面积。 继续冷加工直到达到管的最终期望尺寸。 这在管的整个长度上通过冷加工产生强化效果。
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公开(公告)号：US4538337A
公开(公告)日：1985-09-03
申请号：US624891
申请日：1984-06-27
申请人： Richard L. Holbrook , Dean L. Mayer
发明人： Richard L. Holbrook , Dean L. Mayer
CPC分类号： F16L9/18 , B21C37/151 , B21C37/154 , E21B17/00 , E21B36/00 , E21B36/003 , Y10T29/49361 , Y10T29/49861 , Y10T29/49863 , Y10T29/49879 , Y10T29/4994
摘要： A method of prestressing a tubular apparatus having coaxial inner and outer metal tubes which are connected to each other at axially spaced locations. After the inner and outer tubes are connected to each other so that the tubular apparatus may be heat-treated or otherwise processed before it is prestressed, the diameter of at least a portion of the inner tube is increased so that it is shortened to thereby establish a prestressed condition between the inner and outer tubes with the inner tube under tension and the outer tube under compression.
摘要翻译： 一种对具有同轴的内部和外部金属管的管状装置进行预应力的方法，它们在轴向间隔开的位置彼此连接。 在内管和外管彼此连接之后，使得管状装置在预应力之前可以被热处理或以其它方式加工，内管的至少一部分的直径增加，从而缩短从而建立 内管和外管之间的预应力条件，内管处于张紧状态，外管处于压缩状态。
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公开(公告)号：US4747431A
公开(公告)日：1988-05-31
申请号：US944477
申请日：1986-12-19
IPC分类号： B21J7/18 , B21B19/10 , B21C37/16 , B21H1/00 , B21J7/00 , B21K1/16 , B21K21/08 , B21K21/16 , F16L9/00
摘要： A method of fabricating a tube having enlarged ends and made of material which can be strengthened by cold working comprises fabricating a pre-form having the overall configuration of the tube but with increased outside diameters and a decreased length. The pre-formed tube is cold forged or cold rolled over its entire length to reduce its outside diameter while maintaining its inside diameter substantially fixed. This elongates the tube and reduces its cross-sectional area. Cold working is continued until the final desired dimensions for the tube are reached. This produces a strengthening effect by cold working over the entire length of the tube.
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公开(公告)号：US4470188A
公开(公告)日：1984-09-11
申请号：US413284
申请日：1982-08-31
申请人： Richard L. Holbrook , Dean L. Mayer
发明人： Richard L. Holbrook , Dean L. Mayer
IPC分类号： B21C37/06 , B21C37/15 , B21D41/04 , B21D51/02 , C21D7/02 , C21D8/06 , E21B17/00 , E21B36/00 , F16L9/18 , F16L58/08 , F16L59/06 , B23P9/00
CPC分类号： E21B17/00 , B21C37/151 , B21C37/154 , E21B36/00 , E21B36/003 , F16L9/18 , Y10T29/49861 , Y10T29/49863 , Y10T29/49879 , Y10T29/49927 , Y10T29/49934
摘要： A method of prestressing a tubular apparatus having coaxial inner and outer tubes which are connected to each other at axially spaced locations comprises, after the inner and outer walls are connected to each other and the tube is heat-treated or otherwise processed, reducing the diameter of the outer wall so that the outer wall is elongated. The elongation of the outer wall establishes a prestressed condition between the inner and outer walls, with the inner wall under tension and the outer wall under compression. The reduction in diameter of the outer wall can be accomplished by using a roll extrusion machine, a tube reducer or a draw bench.
摘要翻译： 对具有同轴的内管和外管的管状装置进行预应力的方法，它们在轴向间隔开的位置处彼此连接，在内壁和外壁相互连接并且管被热处理或以其它方式加工之后，减小直径 的外壁，使得外壁是细长的。 外壁的伸长在内壁和外壁之间建立预应力状态，内壁处于张紧状态，外壁处于压缩状态。 外壁的直径减小可以通过使用辊挤压机，管减速器或拉制台来实现。
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5.发明授权
公开(公告)号：US4854148A
公开(公告)日：1989-08-08
申请号：US64048
申请日：1987-06-19
申请人： Dean L. Mayer
发明人： Dean L. Mayer
CPC分类号： B21C37/207
摘要： Formation of continuous grooves on the internal surface of a tube shell, in a single continuous cold drawing step, in which the tube shell is first sunk in a die over a reduced diameter cylindrical mandrel portion so that the diameter of the inner surface of the tube shell is reduced to a dimension below the base of the grooves of a grooved plug portion of the mandrel thereby retarding longitudinal movement of a portion of the reduced internal surface of the sunk tube shell at a plurality of circumferentially spaced intervals to effect formation of longitudinally continuous shallow grooves. The mandrel is allowed to rotate if it is desirable to facilitate the formation of spiral grooves on the tube inner surface.
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