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JP4883431B1 |
[Problem to be Solved] To provide a mandrel mill including a plurality of roll stands in each of which three grooved rolls are disposed, and which can adequately suppress a phenomenon in which a mandrel bar becomes unable to be pulled ou...
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JP4873012B2 |
A mandrel mill is provided which can perform elongation rolling with a markedly increased working ratio and dimensional accuracy on a material which is inherently difficult to roll such as a hollow shell made of stainless steel or a thin...
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JP4863131B2 |
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JP4853514B2 |
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JP4853515B2 |
A process for stainless-steel pipe production which comprises piercing and rolling a raw material stainless steel containing, by mass, Cr: 10-30%, to give a hollow shell, elongating rolling the hollow shell using a mandrel bar, together ...
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JP4788302B2 |
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JP4782935B2 |
A rolling unit for a rolling mill for rolling or sizing metal pipes, bars or wires has at least three rolls arranged in a star arrangement. Each roll has a separate drive mechanism and is rotatably mounted on bearings on both sides of it...
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JP4754818B2 |
To provide a lubricant for hot rolling a seamless steel pipe which is fed in a hollow raw pipe to be adhered inside thereof at the rolling of the hollow raw pipe, thereby exhibiting effects to improve the inner surface quality of the pro...
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JP4740939B2 |
A changeover system (1) for a metal forming mill, in particular for a tube-forming mill, comprises at least one pair of work modules (10,11), the work modules of which are adapted to be pivoted (P1,P2) into and out of a line of work stat...
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JP4735776B2 |
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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JP4736773B2 |
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JP4737347B2 |
A retract mandrel mill, comprising a mandrel mill and an extractor, the mandrel mill including a mandrel bar and being configured to roll a tube blank into which the mandrel bar is inserted, the extractor being configured to extract the ...
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JP4736240B2 |
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JP4724982B2 |
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JP4720491B2 |
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JP4718701B2 |
A rolling unit for a rolling mill for rolling or sizing metal pipes, bars or wires has at least three rolls arranged in a star arrangement. Each roll has a separate drive mechanism and bearings on both sides of the roll. The rolls are ad...
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JP4716206B2 |
[Problem to be Solved] There is provided a device for adjusting the rolling positions of rolling rolls, which is capable of, for example, restraining poor roll-biting of the front edge part of a pipe material rolled by a three-roll mandr...
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JP4706971B2 |
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JP4705096B2 |
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JP4701874B2 |
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JP4697605B2 |
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JP4687498B2 |
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JP2011073030A |
To provide a rolling method with a retract mandrel mill by which the occurrence of defective drawing is suppressed, stable operation is secured, the quality of products is improved and the remarkable reduction of manufacturing cost is ac...
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JP2011073051A |
To provide a method of controlling the manufacture of a seamless tube by which the occurrence of defective products caused by mandrel mill rolling is prevented and the seamless tube excellent in surface properties is manufactured easily....
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JP4650747B2 |
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JP4647501B2 |
A reducing mill according to the invention includes a plurality of stands disposed along a rolling direction line, in which a tube is rolled through the plurality of stands along the rolling direction line. The stands each include n roll...
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JP4613593B2 |
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JP4613431B2 |
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JP4586313B2 |
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JP4529640B2 |
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JP4507193B2 |
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JPWO2008123121A1 |
Even when the target wall thickness of the pipe is different, a mandrel bar having the same outer diameter can be used, and a seamless pipe manufacturing method capable of effectively suppressing the circumferential uneven thickness of t...
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JP4501116B2 |
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JP2010149190A |
To provide a rolling apparatus of a seamless tube capable of manufacturing a tube of less thickness deviation on the outlet side of a reduction mill or the like for adjusting the outside diameter of the tube without using any inside tool...
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JP2010131602A |
To provide a method of manufacturing seamless pipes by which thermal seizure which is apt to generate on the external surface of a pipe in a stretch rolling stage with a mandrel mill is effectively prevented. This method of manufacturing...
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JP4474744B2 |
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JP4477849B2 |
A roll stand for rolling bar-shaped or tubular stock, having a stand housing, having at least one roll which is arranged on a roll shaft rotatably mounted in the stand housing and is connected in a rotationally fixed manner to the roll s...
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JP4470300B2 |
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JP4453278B2 |
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JP4441912B2 |
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JP4438960B2 |
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 t...
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JP4428418B2 |
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JP2010042450A |
To provide an apparatus for rolling a seamless pipe and a control method for rolling of the seamless pipe by which the tube having small thickness deviation on the outlet side of a reducing mill or the like for adjusting the outside diam...
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JP4417634B2 |
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JP4418617B2 |
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JP4411874B2 |
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JP4389869B2 |
When manufacturing a seamless pipe by carrying out elongation rolling and sizing on a mother tube for forming a seamless pipe, the occurrence of portions of thickness variation in the seamless pipe is suppressed by previously identifying...
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JP4375180B2 |
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JP4370572B2 |
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JP4360148B2 |
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