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JP4471719B2 |
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JP4468879B2 |
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JP4454440B2 |
To improve the dimensional accuracy of a cross section by straightening the cross section of a bar having a special shaped cross section which is slit into a prescribed width and has parts having different thicknesses at least in one or ...
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JP4454441B2 |
To improve the dimensional accuracy of the cross section of a strip having a special shaped cross section after heat-treating the strip having the special shaped cross section which is roll-formed by using rolls on which grooves and proj...
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JP4453657B2 |
Cold finished seamless steel tubes according to the present invention are made such that the residual stress F to be generated at the stage of the correction process after cold working is controlled to be 30 MPa or more and the scatterin...
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JP4446530B2 |
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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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JP4430049B2 |
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JP4427303B2 |
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JP4419224B2 |
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JP2010017722A |
To provide a rotational straightening method for a steel pipe by which the bend of the steel pipe is straightened economically while visually observable concave strain figures are prevented from occurring on the inner surface of the stee...
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JP4404905B2 |
In a process to modify the characteristics of a steel pipe (1) subsequently used for a gas pipeline, the pipe is subjected to a water pressure test in which it is simultaneously subject to limited flexing action. During the test, an addi...
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JP4400280B2 |
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JP4390029B2 |
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JP4392311B2 |
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JP4390291B1 |
Forming of a valve head portion (1) of a hollow engine valve (V) comprising a material particularly satisfactory in heat resistance is performed by cold forging. On this occasion, the material with excellent heat resistance is worked to ...
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JP2009297760A |
To provide a bend straightening mechanism for a shaft, which can straighten bend at high precision, and also can improve its strength.Regarding the bend straightening mechanism for a shaft 1 comprising: a cylindrical main shaft 11 made o...
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JP4382512B2 |
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JP4383067B2 |
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JP2009285710A |
To solve a problem that a conventional technique has difficulty to obtain an electric resistance welded tube excellent both in out-of-roundness and buckling resistance.In the manufacturing method of the electric resistance welded tube, r...
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JP2009285684A |
To provide a slip detection method for a roller straightener by which the surface of a material can be prevented from being changed in quality by a slip between straightening rollers and the material during straightening materials of rou...
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JP2009285711A |
To solve a problem that a conventional technique has difficulty to obtain an electric resistance welded tube excellent both in out-of-roundness and buckling resistance.In the manufacturing method of an electric resistance welded tube, ro...
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JP2009285705A |
To provide a manufacturing method of an electric resistance welded tube excellent in buckling resistance property which hardly causes buckling due to earthquake or frozen soil after being laid as a line pipe.In the manufacturing method o...
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JP2009285708A |
To solve a problem of not sufficiently improving buckling resistance property of an electric resistance welded tube by conventional technology.In the manufacturing method of the electric resistance welded tube, a steel strip is roll form...
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JP4378808B2 |
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JP4382385B2 |
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JP4376602B2 |
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JP4376542B2 |
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JP4370114B2 |
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JP4370628B2 |
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JP4360721B2 |
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JP4349710B2 |
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JP4344347B2 |
A roll straightener which is capable of being switched between a zigzag type and an opposed type is disclosed. The roll straightener has an odd-number of pairs of upper and lower rolls. A group of the lower rolls including the second low...
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JP4318986B2 |
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JP2009154191A |
To provide a method for solving the problem that the shaft part which is a thrust part in the shaft end part of a roller is damaged because the roller metal is worn out and the center position which is the axial center of the roller is s...
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JP2009154190A |
To provide a device for protecting a polishing plate holder of a polishing plate having a dovetail groove even when overload is applied to the polishing plate for restraining a material to be straightened during straightening work in a r...
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JP4297354B2 |
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JP2009142877A |
To provide a tube end correcting tool with which a tube end is corrected into a complete circle by smaller force than that of a conventional tool, and the chips are prevented from intruding into piping when performing chamfering at the s...
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JP2009107023A |
To provide a straightening apparatus with which accurate straightening can be performed by raising the rigidity of the main body of a straightening machine.A conveying truck 70 is arranged freely movably in a direction crossing the pass ...
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JP2009101409A |
To provide a method of manufacturing a cylindrically extruded material by which the cylindrically extruded material excellent in the accuracy of an inside diameter is manufactured at high productivity.This manufacturing method is provide...
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JPWO2007052361A1 |
The straightening roll can be easily adjusted, and the setup time and cycle time can be shortened. The fixed side straightening roll 11 and the movable side straightening roll 13 are arranged in parallel on the apparatus main body 10. Th...
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JP2009090373A |
To provide a straightening machine which can achieve high-precision straightening by improving rigidity of the machine without requiring enlargement in size thereof.Main body 11 of the straightening machine 10 comprises a pair of frame m...
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JP2009079495A |
To achieve deformation correction with sufficient precision, and to reduce the occurrence of a defect which can happen during correction of the deformation.A deformation correcting tool 3 includes a cone part 4 and a cylindrical part 5. ...
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JP4255545B2 |
The roll correction machine, to correct rolled stock (1), has a run-in for the rolled stock and several bending rolls. It has at least one adjustable running-out roll (5), controlled by a setting element (13), to guide the rolled stock. ...
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JP4251896B2 |
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JP2009513352A |
The invention relates to a method for leveling profiles ( 5 ). When the hot-rolled profiles are cooled off, they deform considerably. Therefore, the profiles are not leveled while they are hot but are first cooled off. The inventive meth...
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JP4236960B2 |
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JP4223140B2 |
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JP4217649B2 |
To provide equipment for producing continuously cast rods of aluminum alloy with which continuously cast rods of aluminum alloy excellent in quality are produced by efficiently peeling skin portions. The equipment is provided with a melt...
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JP4191922B2 |
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