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JPS6116527B2 |
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JPS6116529B2 |
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JPS6115761B2 |
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JPS6174712A |
PURPOSE: To obtains a pipe stock, used for a cylinder liner, of high quality, in high yield and high productivity, by rolling a stock of Cr-steel slab of specific composition, etc. into a round billet and forming it into a long-sized hol...
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JPS6174711A |
PURPOSE: To prevent the rear end of a metallic pipe from causing poor piercing and malformation by restricting the rear end by the front end of a succeeding pipe without leaving it free. CONSTITUTION: A preceding metallic pipe P1 is conv...
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JPS6174714A |
PURPOSE: To obtain a seamless steel pipe excellent in inner surface properties as well as to lengthen the service life of a plug and to improve operating efficiency by directly cooling and/or lubricating the contacting surface of the inn...
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JPS6171111A |
PURPOSE: To reduce the surface torsion deformation and shear deformation and to produce a hollow pipe stock without any flaw on the inner and outer faces by rolling the stock with giving the tensile stress in the axial direction of less ...
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JPS6167511A |
PURPOSE: To elevate the dimensional accuracy of a product and pipe making efficiency by making the number of rolling reduction times for diameter shrinkage within the specified range in the rolling stage equipping a thickness deviation c...
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JPS6111688B2 |
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JPS6111122B2 |
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JPS6111129B2 |
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JPS6111128B2 |
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JPS6110205B2 |
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JPS6110204B2 |
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JPS6156709A |
PURPOSE: To detect every wall-thickness deviation by providing plural wall-thickness measuring instruments to the circumferential direction and changing the signal of measured wall-thickness at prescribed intervals of time to put it in s...
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JPS619085B2 |
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JPS6141403U |
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JPS617122B2 |
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JPS616961Y2 |
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JPS6142404A |
PURPOSE: To prevent the generation of cracking in a piercing stage and to improve yield by a simple method in the stage of producing a titled steel pipe by a cross helical roll piercing pipe making method by filling preliminarily a mater...
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JPS6142403A |
PURPOSE: To obtain a seamless metallic pipe at a low cost from an alloy metallic ingot of a hardly workable material at the smaller man-hour without being limited by the size thereof by specifying the solidified structure of the ingot ob...
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JPS615803B2 |
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JPS6130207A |
PURPOSE: To reduce the generation of the wall-thickness deviation of a pipe and to improve its quality and yield by detecting the rolling load of each skew roll for a pipe material and moving guide members in their opposite direction so ...
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JPS6122207U |
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JPS6127108A |
PURPOSE: To set quickly a guide disk to an optimum position in accordance with a change of a rolling state by providing a means for moving automatically a position of the guide disk in the axial length direction of a material to be rolle...
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JPS613861B2 |
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JPS612445B2 |
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JPS612446B2 |
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JPS612447B2 |
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JPS612448B2 |
The present invention relates to the manufacture of seamless metal tubes by a cross-roll helical rolling process such as Mannesmann mandrel mill process or by a press piercing process such as Ugine Sejournet process. Shells being worked ...
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JPS612442B2 |
In an apparatus for changing the rolling mill rolls and/or disk shoes of a steel pipe rolling mill, the top and bottom rolls vertically movably mounted in the housing are individually placed on a supporting bed positioned below the botto...
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JPS612443B2 |
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JPS612444B2 |
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JPS61955B2 |
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JPS613608A |
PURPOSE: To provide lessened manpowder, etc. by correcting and storing the control conditions in the previous using stage of the tools to be cyclically used and presetting a rolling mill according to the stored control conditions in the ...
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JPS613601A |
PURPOSE: To improve size control by turning a rotary housing by a prescribed angle in a positive or negative direction when the shortest distance between each roll surface and a pass line increases or decreases then rolling a material. C...
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JPS60261607A |
PURPOSE: To make an immediate countermeasure to prevent thickness deviation and to decrease the generation of a defective seamless pipe by monitoring the generating condition of the thickness deviation in accordance with the moment force...
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JPS6059049B2 |
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JPS6059042B2 |
The invention relates to a method of rotary piercing in seamless tube manufacturing under a rotary piercing process, such as Mannesmann mandrel mill process. Rotary piercing operation is carried out by employing a rotary piercing mill ha...
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JPS60190402U |
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JPS60255927A |
PURPOSE: To increase the efficiency of heating and rolling lines to maximum limit in manufacturing a seamless steel pipe from a round steel slab by controlling the extraction pitch of the round steel slab from a heating furnace on the ba...
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JPS60255205A |
PURPOSE: To reduce the deflection in a roll shaft and to elevate the accuracy in the finishing diameter of the material to be rolled by constituting the rolling load applied on a cantilever roll to be held by a backing-up ring. CONSTITUT...
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JPS60244412A |
PURPOSE: To prevent generation of a shoe mark by deviating the axial center of a rolling plug always to a specified extent in the direction of any one guide shoe side. CONSTITUTION: The rotating speed of at least either one of driving mo...
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JPS60240316A |
PURPOSE: To improve the smoothness on the surface of a circular conical roll by improving the shape of the rolling area of said roll so as to decrease the quantity of the material to be rolled as far as possible thereby smoothing the str...
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JPS60171602U |
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JPS6049048B2 |
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JPS60206514A |
PURPOSE: To improve the quality and yield of a product by obtaining the degree of wall-thickness deviation of a pipe after rolling and adjusting the angular difference between the opposite faces of a skew roll and a plug based on the rel...
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JPS6045962B2 |
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JPS6045963B2 |
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JPS60196214A |
PURPOSE: To improve productivity and quality with a cross helical rolling mill for producing a seamless steel pipe by measuring the eccentric motion of a blank pipe during rolling, detecting the rate and position of end bending and decre...
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