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JP2017522192A |
The present invention relates to a plant (10) for rolling seamless pipes. The plant is a rotary drilling machine (20) designed to drill a piece of steel (11) pressed against a plug (22) mounted on a rod to obtain a punched blank (12). It...
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JP6156322B2 |
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JP6130832B2 |
The present invention relates to a roll-holder cartridge for a rolling mill 20. The cartridge 24 comprises two side walls 26, a plurality of roll-lever units 30, two adjusting rings 28 and an adjusting actuator 32. Each side wall of the ...
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JP6094275B2 |
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JP6015269B2 |
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JP6015270B2 |
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JP5958450B2 |
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JP5849895B2 |
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JP5779709B2 |
A rolling plant (R) for rolling tubes having a multi-stand rolling mill (5) with two or more rolls, in order to implement a controlled speed mandrel rolling process, comprises a hooking and releasing device (61) which is arranged in the ...
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JP5765190B2 |
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JP5740974B2 |
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JP5734284B2 |
The present invention relates to a system and method for rolling a seamless tube. The plant comprises a main rolling mill with adjustable rolls for mandrel-rolling a semi-finished tube. The plant also comprises a fixed-roll extracting/re...
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JP5706435B2 |
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JP5689776B2 |
Continuous coil tubing made from shorter lengths of flat metal strip which are spliced end-to-end and formed into tubular form and seam welded and thereafter introduced into a forging or hot reduction process. Finished coil tubing is wit...
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JP5688476B2 |
A tube rolling plant (R) with multi-stand rolling mill having two or more rollers, for implementing a mandrel rolling process with controlled speed has a mandrel (31) which is inserted into the hollow body (39) from the frontal opening t...
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JP5679981B2 |
The invention relates to a method for producing seamless tubes from metal, particularly from steel, wherein a previously produced hot hollow block is stretched by means of a three-roll bar rolling mill on a mandrel to form a parent tube ...
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JP5655737B2 |
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JP2014531323A |
A rolling stand for pipes or rounds with two or more rolls (10, 20, 30) defining the rolling cross section of the rolling stand that is coaxial with the rolling shaft Y of the stand, where each roll is with the rolling shaft. Each has a ...
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JP5615938B2 |
The present invention teaches rolling a seamless tube, typically with a large diameter. The system comprises a furnace for heating billets produced by continuous casting. The system comprises a piercing mill for longitudinally piercing t...
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JP2014166649A |
To provide a method which sufficiently prevents the generation of thickness deviation and scratches in a cross section during seamless steel pipe draw rolling using a plug mill.In a method for manufacturing a seamless steel pipe, a hollo...
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JP2014151366A |
To provide means for improving the quality of pipe-like work pieces, in a rolling mill for the production of the pipe-like work pieces comprising at least two successive consecutive rolling stages.An approach line for the mandrel rod of ...
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JP5565533B1 |
A powder lubricant composition according to the present invention includes 65 parts by mass to 95 parts by mass of sodium borate, and 5 parts by mass to 35 parts by mass of cryolite. A method for manufacturing a seamless steel pipe accor...
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JP5504831B2 |
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JP5503334B2 |
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JP5459457B1 |
A manufacturing method of a seamless metal pipe includes determining whether a preceding-stage stand group is used in outer diameter reduction or in thickness reduction of a hollow shell; and performing elongating on the hollow shell, in...
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JP5459455B1 |
This method for manufacturing a seamless metal tube includes a step of preparing a plurality of mandrel bars having different lengths of work portions that come into contact with the hollow raw tube during stretching and rolling; A step ...
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JP2014042949A |
To enhance precision of polishing on rolls constituting a roll stand by polishing the rolls based upon an actual arrangement of the respective rolls in a housing.Virtual center positions P10', P20' of respective rolls R1 to R3 in a YZ su...
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JP2013544653A |
In a method for producing seamless pipes, a hot hollow block created previously in a piercing mill is stretched by means of a continuous rolling mill on a mandrel bar to form a parent pipe and the parent pipe is fed directly to a stretch...
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JP5343985B2 |
Provided is a multi-roll mandrel mill in which "compacting of roll chock portions" is achieved, a plurality of grooved roll bodies is included as a roll pass which performs the reduction rolling of a shell, and a plurality of roll stands...
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JP5273231B2 |
Provided is a seamless-metal-pipe manufacturing method whereby cracking of the inner surface of the pipe is inhibited. The seamless-metal-pipe manufacturing method in this embodiment is provided with the following steps: a step (S2) in w...
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JP5273230B2 |
Provided is a seamless-metal-pipe manufacturing method whereby cracking of the pipe when in a molten state is inhibited. The seamless-metal-pipe manufacturing method in this embodiment is provided with the following steps: a step (S2) in...
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JP5273036B2 |
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JPWO2011148613A1 |
Using a 3-roll type constant diameter rolling mill, the outer diameter of the (i) th stand is ρiWhen (%) is expressed by the following formula (1), constant diameter rolling is performed under the condition that the outer diameter work ...
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JP5212768B2 |
A rolling stand 100 in accordance with the invention is a rolling stand provided with three grooved rolls for rolling a tubular or bar shaped material to be rolled, in which three grooved rolls R21 to R23 are arranged in such a manner th...
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JP5177261B2 |
The present invention provides a controlled rolling method of a seamless steel tube excellent in strength and low-temperature toughness to be applied to a process of making a seamless steel tube, and this controlled rolling method compri...
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JPWO2011039941A1 |
A mandrel mill provided with a plurality of rolling stands, wherein the rolling stand is provided with three hole rolls, the three hole rolls form a hole by a rolling surface, and the diameter of the groove bottom of the hole roll. DR, T...
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JP5139980B2 |
The invention relates to a rolling mill for tubes, in which a series of roll-holder containers (10) is housed in an external structure (2) extended along a rolling axis (L); the containers can slide inside the structure to be extracted t...
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JP5093119B2 |
A pipe in which polygonization is substantially eliminated is manufactured by a reducer with a grooved roll with a groove having a groove bottom zone including the center of the groove in the roll axial direction and flange zones adjoini...
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JP2012223791A |
To provide a manufacturing method by which high dimensional accuracy equal to a cold drawn product is obtained by slight diameter reducing rolling so as to suppress the deterioration of workability as far as possible.By using total one s...
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JP5062522B2 |
The present invention provides a mandrel mill and the like that is capable of not only enhancing the elongation ratio of the pipe or tube, but also suppressing a pinhole defect from occurring. The first means of the present invention pro...
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JP5041304B2 |
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JP5011770B2 |
Martensitic stainless steel tubes are produced by optimizing the chemical composition of steel for billets (C: 0.15-0.22%, Si: 0.1-1.0%, Mn: 0.10-1.00%, Cr: 12.00-14.00%, N: 0.01-0.05%, P: not more than 0.020% and S: not more than 0.010%...
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JP5003833B1 |
There is provided a method for manufacturing a roll for reducing rolling capable of suppressing the occurrence of fin flaws and edge flaws. A roll for reducing rolling that is used on a three-roll type reducing-rolling mill is prepared. ...
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JP2012143775A |
To provide a roll unit that is compact, highly-rigid, and easy to change rolls, and, when in use, mounted on an outer housing of a diameter reduction pipe rolling equipment stand for reducing the diameter of a pipe.The roll unit 1 includ...
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JP4946223B2 |
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JP4935550B2 |
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JP4910693B2 |
In applying a non-graphite-based lubricant composed of, by mass %, 10 to 70% of an oxide-based lamellar compound and 30 to 90% of boric acid onto a mandrel bar, the lubricant film thickness is set from a predetermined master curve for th...
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JP4900385B2 |
A method for surface treating a mandrel bar used for hot rolling of high-alloy seamless steel pipe is provided. The method includes heat treating the mandrel bar to develop a scale, and after heat treatment, rolling ordinary steel compri...
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JP4894855B2 |
It is a problem of the present invention to provide a method of manufacturing the seamless pipes having better mechanical properties, by means of a pipe manufacturing method with large energy-saving effect to continuously carry out proce...
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JP4893858B2 |
In cold rolling of a seamless metallic tube with a cold pilger mill, when a reduction ratio of an outside diameter becomes excessive in comparison to a reduction ratio of a wall thickness, strain in a circumferential direction on flange ...
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