Abstract: 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.

Abstract: 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.

Abstract: 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 ? and a cross angle ? of main rolls in a range satisfying the following expressions (1) to (3), setting the relationship between outer diameter “d0” of the solid billet and the outer diameter “d” and thickness “t” of a hollow piece after piercing so as to satisfy the following expression (4), and further setting the relationship between inlet diameter D1 and outlet diameter D2 of the main roll with the above-mentioned “d0”, “d” and ? so as to satisfy the following expression (5) 8°???20°??(1) 5°???35°??(2) 15°??+??50°??(3) 1.5???r/???4.5??(4) (d/d0)/(0.75+0.025?)?D2/D1??(5) In the expression (4), ?r=1n(2t/d0) and ??=1n{2(d?t)/d0}.

Abstract: 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 ? and a cross angle ? of main rolls in a range satisfying the following expressions (1) to (3), setting the relationship between outer diameter “d0” of the solid billet and the outer diameter “d” and thickness “t” of a hollow piece after piercing so as to satisfy the following expression (4), and further setting the relationship between inlet diameter D1 and outlet diameter D2 of the main roll with the above-mentioned “d0”, “d” and ? so as to satisfy the following expression (5). 8°???20°??(1) 5°???35°??(2) 15°??+??50°??(3) 1.5???r/???4.5??(4) (d/d0)/(0.75+0.

Abstract: A navigation system has a display screen which can be divided into a plurality of windows for simultaneously displaying different classifications of routes in the same scale, or different routes from a present position or starting point to a destination or return to a route from which a car has deviated.

Abstract: A vehicular navigation system includes: a current position detection unit for detecting the current position of the vehicle; an information storage unit for storing map information for conducting route searching and for providing route guidance; an input unit for inputting a destination and inputting instructions for executing a search of the map information for a route from the current position detected by the current position detection unit to the destination; an output unit for outputting information for route guidance; and a central processing unit for temporarily memorizing a route detected by the route search and for outputting a signal to the output unit to provide route guidance according to the memorized route. The central processing unit judges whether or not one information storage unit has been replaced by another and, when replaced, if the destination has not been reached, conducts another route search from the current position to the destination.

Abstract: 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.

Abstract: 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.

Abstract: 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..theta.2+2.degree.<.delta.<9.degree., .delta.+.theta.1<12.degree.

Abstract: 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.

Abstract: 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.

Abstract: A fin assembly for use as a heat sink and production thereof are disclosed. The fin assembly comprises a plurality of heat dissipating plates formed by means of a multi-wire saw, and the heat dissipating plates each has a thickness of no more than 1 mm and being spaced apart by a gap of no more than 1.5 mm.

Abstract: In a method of elongating a metal tube by means of a mandrel mill, a tapered mandrel bar is inserted into a hollow piece and the feeding speed of the mandrel bar is controlled so as to change the length by which the mandrel bar projects beyond the delivery end of the final stand of the mandrel mill at the point of time when the leading end of the hollow shell is gripped by the rolls in the final stand. As a result, the wall thickness of the hollow shell is altered to permit the rolling of hollow shells of many sizes with different wall thicknesses using a single mandrel bar.

Abstract: A fin assembly for use as a heat sink and production thereof are disclosed. The fin assembly comprises a plurality of heat dissipating plates formed by means of a multi-wire saw, and the heat dissipating plates each has a thickness t of no more than 1 mm and being spaced apart by a gap g of no more than 1.5 mm the heat dissipating plates or pins having a height h, wherein the ratio h/t is not less than 20 and the ratio h/g is not less than 15 in one embodiment and 19 in another embodiment of the invention.

Abstract: Pin-finned heat sink having good heat dissipating characteristics satisfy the following inequality: ##EQU1## where d is the diameter of pins, c is the distance between pins, and h is the height of pins. This heat sink can increase the level of integration of semiconductor devices with which it is used.

Abstract: A method of producing a laminated metal belt with a space corresponding to the thickness of resin between respective ring belts by a step for forming a laminated sheet by bonding the number of metal sheets corresponding to the number of ring belts constituting the laminated metal belts of one unit with resin, a step for forming a seamless cylindrical body having predetermined inside and outside diameters from the laminated sheet, a step for cutting the cylindrical body radially into sections to obtain laminated rings and a step for removing resin from the laminated ring.

Abstract: A method for producing a metallic material having an ultra-fine microstructure, the metallic material exhibiting a phase transformation of a low-temperature phase into a high-temperature phase is disclosed, the method comprising the steps of:preparing a metallic material which comprises at least a low-temperature phase;applying plastic deformation to the metallic material; andincreasing the temperature of the metallic material to a point beyond a transformation point while applying the plastic deformation to effect reverse transformation of the low-temperature phase into a high-temperature phase.

Abstract: Heat-radiating substrate material characterized by a matrix of Ni-Fe alloy or Ni-Co-Fe alloy where a plurality of Cu elements penetrating cross-sectionally and the metals being mutually bonded by diffusion bonding to form multiple-core material.A method of manufacturing multiple-core complex material including process steps of manufacturing clad complex core member with a circular cross section, followed by formation of multiple-core complex billets composed of a plurality of complex core members filled in a metallic tube within the extent that the ratio of the inner diameter (D) of the metallic tube to the outer diameter (d) of the core member D/d is not less than 12, and then, after heating the complex billets, the core members are diffused and bonded together by a hot working at a reduction of area being not less than 20%.

Abstract: The present invention relates to a method of manufacturing a clad bar and is basically characterized in that a columnar core member is fitted in a cylindrical outside layer member and the resulting assembly is heated, and then the heated assembly is rolled by a rotary mill provided with three or more cone type rolls to integrate the core member and the outside layer member by diffusion bending. The method is additionally characterized in that, in order to prevent unnecessary substances, such as oxides, from being formed on an interface between the core member and the outside layer member, the assembly is sealed at both ends thereof under reduced pressure or under vacuum or the assembly is cold drawn, the assembly thus welded or cold drawn is then heated and subsequently rolled by a rotary mill. Thus, an intermetallic compound layer formed between the core member and the outside layer member can be thinned, whereby improving bond strength.

Abstract: A method of manufacturing a metallic tube with a spiral fin for use as a heat transfer tube of a heat exchanger and the like. A solid metallic bar or metallic elementary hollow bar provided with a small hole is supplied to an inclined rolling mill having a plurality of rolls provided with a plurality of annular grooves formed on an outer circumferential surface thereof, and the solid metallic bar or metallic elementary hollow bar is worked into a pierced hollow bar by piercing rolling by means of a piercing plug and at the same time a fin is formed on an outer circumferential surface of the pierced hollow bar to integrate the fin with a body of the tube. Accordingly, the piercing rolling and the formation of the fin on the outer circumferential surface of the tube can be carried out at the same time, so that the manufacturing process can be remarkably shortened and the productivity can be high.