Sumitomo Metal Industries, Inc.

Nippon Steel Sumitomo Metal Corporation

Sumitomo Special Metals Co., Ltd.

Sumitomo Precision Products Co., Ltd.

Sumitomo Kinzoku Kogyo Kabushiki Kaisha

Sumitomo Kinzoku Kogyo Kabushiki Gaisha

Sumikin Precision Forge Inc.

Chihiro Hayashi

Kazuyuki Nakasuji

Masayasu Kojima

Kouichi Kuroda

Yoshiaki Kusaba

Masahito Tasaka

Toshio Aihara

Kazuhiro Shimoda

Tomio Yamakawa

Takashi Tsukamoto

Kenji Aihara

Tetsuo Abiko

Keiji Miki

Hyoji Hagita

Yasuhiro Asai

Fumio Ohtake

Yoshiyuki Suzushima

Masami Hamada

Nobuhiro Murai

Takeshi Kikuchi

Kiyokazu Tanaka

Kimihiko Ohminato

Youichi Imamura

A solid billet is piercing-rolled using a 4 roll-type inclined rolling mill including larger-diameter cone-type main rolls arranged horizontally or vertically to face each other across a pass line and smaller-diameter auxiliary rolls arranged vertically or horizontally to face each other similarly across the pass line between the facing main rolls, while maintaining a feed angle &#x3b2; and cross angle &#x3b3; of the main rolls and a feed angle &#x3b2;' and cross angle &#x3b3;&#x2032; of the auxiliary rolls to be within the ranges: 5&#xb0;&#x2264;'&#x3b2;, &#x3b2;&#x2032;'&#x2264;25&#xb0;; 3&#xb0;&#x2264;'&#x3b3;, &#x3b3;&#x2032;'&#x2264;35&#xb0;; and 10&#xb0;&#x2264;&#x201c;&#x3b2;+&#x3b3;, &#x3b2;&#x2032;+&#x3b3;&#x2032;&#x201d;&#x2264;55&#xb0;.

Method for producing seamless metal pipe

A method for producing an ultrathin-wall seamless metal tube, which employs a cold pilger mill of mechatronics drive type including a mechanism to give a feed and a turn angle to a tube material, utilizes a roll having a tapered groove whose diameter gradually increases or gradually decreases from an engaging entry side to a finishing exit side of a pair of rolls, and a tapered mandrel whose diameter similarly gradually increases from the engaging entry side to the finishing exit side to elongate the tube material by reducing a wall thickness while expanding a mid-wall diameter of the tube material. By giving amounts of a turn angle and/or a feed equivalent or nearly equivalent to the forward stroke to the tube material immediately before the start of a backward stroke, it is possible to achieve a further increase in the reduction-rate of rolling, a further reduction of wall thickness, and improvement of dimensional accuracy of the product.

Method for producing ultrathin-wall seamless metal tube by cold rolling method

A method for manufacturing a seamless pipe, capable of preventing the carburization phenomenon that occurs in a manufacturing process of pipe and simplifying an elongation rolling process, is provided. In this method, after piercing in the piercing rolling process, rolling is performed without using an inside regulating tool in the elongation rolling process, or without performing the elongation rolling followed by reducing rolling in a reducing rolling process, andthickeningreducing the wall thicknessis then performed by use of a cold mill or cold draw bench in a cold rolling process. According to this method, the trap of graphite fine particles in the inner and outer surfaces of the pipe that took place in the conventional elongation rolling process can be minimized to prevent the carburization of the pipe. The method of the present invention is effective, particularly as a measure for preventing the carburization of an ultra-low carbon stainless steel or high alloy steel.

Method for manufacturing seamless pipes or tubes

A method of producing an ultrathin-wall metal tube by a cold drawing method includes a diameter-expanding drawing method, in which an entry solid die, the diameter of which increases, remains constant or decreases from the engaging entry side toward the finishing exit side, and a delivery solid die, the diameter of which decreases at least in the vicinity of the engaging entry, are arranged in series and in an abutting relation on the same pass line. A tapered plug, the diameter of which increases from the engaging entry side toward the finishing exit side, floats along the pass line, whereby in the entry solid die region, the wall thickness is reduced while the mid-wall diameter of a hollow shell is being expanded between the solid die and the plug, and in the delivery solid die region, the tapered plug floats by performing reduction working of the outside diameter.

Method of producing ultrathin-wall seamless metal tube using floating plug

An exemplary embodiment of the invention provides a method for producing an ultra thin wall metallic tube by cold working method with significant wall thickness reduction. In a method for producing the metallic tube with a cold pilger mill according to the invention, cold rolling is performed while tube diameters are being expanded using rolls having tapered groove dies whose calibers increase from an engaging entry side toward a finishing exit side. In a method for producing the metallic tube with a drawing machine according to the invention, cold drawing is performed while the tube diameters are being expanded using a solid die whose calibers increase from an engaging entry side toward a finishing exit side and a plug of a tapered mandrel bar whose diameters increase from an entry side of the die toward an exit side. In the metallic tube producing method, a maximum diameter of the plug or tapered mandrel bar may be larger than an outside diameter of the mother tube.

Method for producing ultra thin wall metallic tube with cold working process

An aspect of the present invention provides a method for producing an ultra thin wall metallic tube by a cold rolling method with significant wall thickness reduction. In a method for producing the metallic tube with a cold pilger mill, a wall thickness is reduced to perform elongation while a wall thickness center diameter is expanded using a pair of rolls, which has a tapered groove die whose diameter is gradually expanded or reduced from an engaging inlet side of the roll toward a finishing outlet side thereof, and a tapered mandrel bar, whose diameter is gradually expanded from an engaging inlet side of the tapered mandrel bar toward a finishing outlet side thereof.

Method for producing ultra thin wall metallic tube by cold rolling method

In a method of producing an ultra thin wall metallic tube by a cold drawing process in which a drawing machine is used, a wall thickness of the metallic tube is reduced to perform drawing while a tube-wall centerline diameter of a tube material is expanded, using a solid die which gradually increases in diameter from its engaging inlet side toward its work-ending outlet side and a plug or a tapered mandrel bar which gradually increases in diameter over a corresponding distance from the engaging inlet side of the solid die toward the work-ending outlet side of the solid die, whereby the wall thickness can dramatically be reduced.

Method of producing ultra thin wall metallic tube by cold drawing process

A method for manufacturing a seamless pipe, capable of preventing the carburization phenomenon that occurs in a manufacturing process of pipe and simplifying an elongation rolling process, is provided. In this method, after piercing in the piercing rolling process, rolling is performed without using an inside regulating tool in the elongation rolling process, or without performing the elongation rolling followed by reducing rolling in a reducing rolling process, and thickening is then performed by use of a cold mill or cold draw bench in a cold rolling process. According to this method, the trap of graphite fine particles in the inner and outer surfaces of the pipe that took place in the conventional elongation rolling process can be minimized to prevent the carburization of the pipe. The method of the present invention is effective, particularly as a measure for preventing the carburization of an ultra-low carbon stainless steel or high alloy steel.

A piercing method for manufacturing a seamless pipe capable of suppressing the rotary forging effects and suppressing the redundant shear strain without excessive narrowing of the roll diameter is provided. This method is characterized by holding a feed angle &#x3b2; and a cross angle &#x3b3; of main rolls in a range satisfying the following expressions (1) to (3), setting the relationship between outer diameter 'd' of the solid billet and the outer diameter 'd' and thickness &#x201c;t&#x201d; of a hollow piece after piercing so as to satisfy the following expression (4), and further setting the relationship between inlet diameter Dand outlet diameter Dof the main roll with the above-mentioned &#x201c;d&#x201d;, &#x201c;d&#x201d; and &#x3b3; so as to satisfy the following expression (5)8&#xb0;&#x2266;&#x3b2;&#x2266;20&#xb0;&#x2003;&#x2003;(1)5&#xb0;&#x2266;&#x3b3;&#x2266;35&#xb0;&#x2003;&#x2003;(2)15&#xb0;&#x2266;&#x3b2;+&#x3b3;&#x2266;50&#xb0;&#x2003;&#x2003;(3)1.5&#x2266;&#x2212;&#x3c8;/&#x3c8;&#x2266;4.5&#x2003;&#x2003;(4)()/(0.75+0.025&#x3b3;)&#x2266;&#x2003;&#x2003;(5)In the expression (4), &#x3c8;=1n(2t/d) and &#x3c8;=1n{2(d&#x2212;t)/d}.

Piercing method for manufacturing of seamless pipe

A heat sink comprising a bottom plate and a plurality of fin groups on the bottom plate is disclosed, the plurality of the groups being spaced from one another, and aligned in a matrix form or arranged in a staggered pattern, and each of the group comprising a plurality of plane parallel plates or pins that are integral with the bottom plate.

Process for producing heat sink having good heat dissipating

Heat sink having good heat dissipating characteristics

A method for manufacturing seamless steel tubes by the Mannnesmann tube making process wherein a billet is passed through a piercer and the center of the billet is pierced through to obtain a hollow shell. A pair of disk rolls are disposed to incline by a skew angle .delta. with respect to a pass line toward cone-type main roll located at the entry side, where a material to be rolled enters into the disk roll sliding face, thereby to become unparallel with the outlet face angle of the main roll, while the skew angle .delta. is set to satisfy the following conditions related to the skew angle .delta., the inlet face angle .theta.1 and the outlet face angle .theta.2 of the main roll, thereby to obtain expansion ratio of outer diameter of 1.15 or higher value.

Piercing-rolling method and piercing/rolling apparatus for seamless

A heat sink fin assembly of the corrugated type for cooling an LSI package comprises a flat base plate and a heat dissipating member made of a thin metal sheet having convex and concave portions which are comprised of a repeated series of side wall portions, top portions, and bottom portions. The base plate and the heat dissipating member are integrated with each other by bonding.

Heat sink fin assembly for cooling an LSI package

According to the rolling method and the apparatus to be used for its execution of the invention, by rolling a tube to be rolled by using four rolls possessing roll grooves for forming a caliber in a shape of having a relief portion, cold reducing or cold stretch reducing is done continuously without causing wall thickness deviation, and by sizing the rolled tube material by a die disposed at the exit side, the dimensional precision and yield of rolled tubes may be enhanced by a small number of stands.

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Sendai, Japan

Chihiro Hayashi