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JP4480121B2 |
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JP4468783B2 |
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JP4456489B2 |
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JP2010051971A |
To obtain a bent steel pipe in which rapture on the outside of a bend is prevented and also flattening is suppressed even when a thin wall steel pipe is used as a base stock.In this method of bending a steel pipe to be worked, the steel ...
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JP4427494B2 |
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JP4394377B2 |
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JP4391614B2 |
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JP2009281711A |
To efficiently and inexpensively obtain a double tube of excellent heat exchange performance having a bent part to which accurate bending is performed while allowing a space between an outer tube and an inner tube of the bent part to be ...
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JP4366755B2 |
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JP4360671B2 |
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JP2009241145A |
To suppress differential pressure at the inlet and the outlet of the fluid which flows through the clearance between the internal pipe and the external pipe of a double pipe, in the double pipe which is provided with an internal pipe and...
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JP2009233709A |
To provide an extrusion bending apparatus enabling a pipe material to be extruded and bent into a complicated shape and a weld part to be reduced.In the extrusion bend processing apparatus 1, a straight hole 3 and a bent hole 4 are forme...
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JP4318552B2 |
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JP4318846B2 |
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JP2009183983A |
To provide a method of bending an electric resistance welded steel tube by which the life of a working tool of a rotating and pull-bending apparatus is prolonged in the working of the electric resistance welded steel tube having a stage ...
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JP4313693B2 |
A movable die base ( 2 ) is moved toward a stationary die base ( 1 ). A pressing force is applied by a bending punch ( 21 ) disposed on the movable die base to a bending target portion of a pipe (A) which is placed on a die ( 11 ) provid...
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JP2009172661A |
To provide a core body for a pipe bender capable of suppressing failure in the thickness reduction on the bending outer peripheral side of a pipe.When the pipe 9 having the inner wall surface 92 forming a pipe hole 90 is bent, the core b...
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JP4288321B2 |
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JP2009113098A |
To provide a new mandrel for bending which can prevent the deformation of the inside part in the bent part of the pipe body to be worked.In the mandrel 10 for bending provided with: a shank 20 whose outer face has a columnar shape and wh...
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JP2009072804A |
To provide a method of bending a metallic pipe which is very simple and yet allows the pipe to be bent without deforming the cross-sectional shape of the pipe.One opening of the pipe is stopped with a cap and granulated sugar is poured f...
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JP4232868B2 |
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JP4229766B2 |
A mandrel (10) for bending which inhibits generation of irregularities on the inside of the bend is provided. The mandrel (10) comprises a plurality of plugs (12) in the form of discs and a through-hole (16) is created substantially in t...
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JP2009012036A |
To provide a method of bending of hose coupling metal fittings which improves the durability by suppressing flaws and wrinkles caused on the inside surface of the fittings in a bent part while preventing the collapse of the fittings them...
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JP2009000717A |
To provide a tool for bending pipes in which the ball member of the tool for bending pipes is made freely tiltable to the main body part and a pipe bending device using the tool for bending pipes.The tool for bending pipes is inserted to...
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JP2008307576A |
To improve strength, workability, shape accuracy and surface property in a bent portion while suppressing the cost as low as possible.In the bent part 4 of a pipe, which is made by bending various metallic pipes 40 by various bending wor...
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JP2008183574A |
To provide a method for bending a tubular material, which method can achieve a bent tube having no crack and wrinkle at bent portions, etc.In the method for bending the tubular material, mandrels 5 having quarter spherical projections at...
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JP2008173648A |
To provide an elbow which can cause the small reduction of the thickness on the outer peripheral portion of a bent portion, and can suppress the generation of wrinkles on the inner peripheral side of the bent portion irrespective of the ...
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JP2008168351A |
To provide a mandrel for pipe bending apparatus provided with high-rigidity member.In a mandrel in which an average radius Rm and the axis in the longitudinal direction pass through the axis in the longitudinal direction of a pipe, which...
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JP4101610B2 |
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JP4080255B2 |
A method for producing a bumper reinforcement having a hollow and a substantially rectangular cross sectional shape formed by the steps of providing a straight tubular member and forming a curved bumper reinforcement, continuously; where...
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JP2008043963A |
To provide an apparatus and a method for bending a tube by which the tube C can be accurately and efficiently bent by preventing flattening and other bending errors in bending the tube C, and further to provide a bent tube and a ball scr...
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JP2008023537A |
To provide a method for easily producing a double tube with a curved part, which has an inner tube and an outer tube, wherein a fluid can be made to flow to a gap between the inner tube and outer tube, and to the hollow of the inner tube...
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JP4041721B2 |
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JP4031827B2 |
A method where an inside mandrel is inserted into the inner pipe of the multi-layered pipe, a tubular outside mandrel is inserted into the annular space between the inner pipe and outer pipe, the multi-layered pipe is clamped to a bendin...
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JP2007331021A |
To provide a bending method by which the base end part of a straight short tube is beforehand fixed to the front end face of the valve main body and the mouth part of a valve is easily and accurately formed by bending this straight short...
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JP2007534490A |
The present invention relates to a method for manufacturing a double wall bent part (10) including an inner pipe (11) and an outer pipe (12), particularly a double pipe. The inner pipe is separated from the outer pipe by a gap (d), and a...
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JP4014824B2 |
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JP2007289973A |
To provide a pipe bender with which each component can be driven highly accurately and delicately without interfering with each other, which is high in reliability and with which the production efficiency and the manufacturing accuracy o...
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JP2007283406A |
To provide a method where, after the bending process for a flat tube, the cross-sectional area and the wall thickness in the reversing arc portion are not reduced. The method for bending a flat tube includes the steps of bending the flat...
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JP2007283359A |
To provide a mandrel for bending work which can supply an appropriate amount of a lubricating oil into a pipe. The mandrel for bending work has a discharge port 56 opened inside the pipe 3 and connected to a supply channel 70 into which ...
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JP2007275929A |
To provide a tubular article bending device capable of consistently performing the bending of a tubular article at a smaller radius of curvature without any defective appearance quality such as cracks and wrinkles. The bending device for...
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JP3995281B2 |
A high-pressure piping metal tube to be exposed to a high-pressure fluid on its inner face and having an increased number of service times, and a process for manufacturing the high-pressure piping metal tube. This high-pressure piping me...
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JP2007526133A |
An apparatus comprises a rotating member having one or more rollers. The one or more rollers have a plurality of protuberances. The rollers may be advanced toward a surface during rotation of the rotating member, such as toward a bore su...
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JP3974439B2 |
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JP2007203367A |
To provide a bending method and a bending device capable of controlling the reduction of the wall thickness of a pipe when bending the pipe without applying any lubricating oil to an inner surface of the pipe. A pipe (P) with a mandrel (...
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JP2007203366A |
To provide a bending method and a bending device capable of controlling the reduction of the wall thickness of a pipe and the buckling of the pipe when bending the pipe without applying any lubricating oil to an inner surface of the pipe...
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JP2007187364A |
To provide a production method for a heat exchanger, for securing performance and improving productivity of the heat exchanger by performing stable bending processing of the heat exchanger wherein fin material or piping material is thinn...
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JP2007518571A |
Disclosed is a method for hot flow forming and bending closed, half-open, and open profiled members. Said method uses a bending machine comprising at least two rollers (17, 18) which are disposed across from each other in the feeding dir...
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JP3943958B2 |
To provide a method and an apparatus capable of bending a hollow double pipe having a narrow space between inner and outer pipes and thin thickness for using an exhaust pipe of an internal combustion engine for automobile and the like. I...
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JP3919354B2 |
To provide a bending method of a double-tube type heat exchanger which can be stably bent without generating uneven-thickness space and clogging phenomenon even when corrugated heat transfer fins are provided on the side of the internal ...
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