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JP3369320B2 |
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JP3369297B2 |
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JP3367332B2 |
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JP3361375B2 |
Pre-reduction equipment for guiding a pipe blank and reducing its end before it enters an "Assel" rolling mill, which is disposed immediately downstream from the pre-reduction equipment and consists of several freely rotatable rollers, w...
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JP2002361304A |
To provide a method for manufacturing a seamless steel tube using a round billet capable of suppressing inner face flaws that occur at the time of piercing a RCC stock with a skew rolling. 1. The round billet as continuously cast, especi...
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JP3348664B2 |
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JP2002331301A |
To provide an inclined drilling rolling method capable of manufacturing a seamless steel tube having less deflective wall thickness and no internal flaw at high rolling efficiency.In the inclined drilling rolling method using two or more...
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JP2002327234A |
To provide a round billet for a seamless steel tube which can be drilled in a continuously as-cast state, and a drilled seamless steel tube thereof.The round billet for the seamless steel tube includes, by mass%, 0.05-0.55% C, 0.1-0.4% S...
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JP2002316201A |
To provide a planetary skew rolling method by which its various problems are eliminated by at least partially preventing temperature rising to the recrystallization temperature when performing deformation process.In the method for manufa...
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JP2002301504A |
To provide a manufacturing method of a seamless metallic tube by which the defective biting of a billet in a piercer is suppressed.When a mill scale material is used as a round billet, the major axis (a) and the minor axis (b) in a regio...
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JP2002282908A |
To achieve an improvement in the uniformity of pipe wall thickness in a piercer mill to be utilized in the first process for manufacturing a seamless steel pipe.A piercer mill guide comprises a guide shoe provided with an opening for mak...
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JP2002282907A |
To achieve an improvement in the uniformity of pipe wall thickness in a piercer mill to be utilized in the first process for manufacturing a seamless steel pipe.A piercer mill guide is configured and that a guiding unit, comprising a gui...
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JP2002282906A |
To achieve an improvement in the uniformity of pipe wall thickness and stabilization of piercing rolling in a piercer mill to be utilized in the first process for manufacturing a seamless steel pipe.A method comprises a process in which ...
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JP3319428B2 |
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JP2002239613A |
To provide a method for manufacturing a seamless tube made of high-alloy steel being a heavy-load material at a low cost with a manufacturing line for seamless tubes using an inclined piercing mill.After a base stock is machined into the...
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JP2002224712A |
To provide multiple-hump rolls for Asser mills solving problems about a reduction in rolling efficiency, a variation in wall thickness, etc., due to an insufficient bulge of shells after rolling and difficulty for pulling out mandrels at...
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JP2002210508A |
To provide a radius shape in the body part of a plug for reducing flaws on the inside surface of a steel tube when manufacturing a seamless steel tube by Mannesmann process and a manufacturing method for the seamless steel tube using the...
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JP2002210507A |
To provide a piercing method for a seamless steel tube.In a method for piercing the seamless steel tube, in this piercing method of the seamless steel tube, by working the tip part of a billet into a taper shape and working the shape of ...
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JP3309807B2 |
To provide a size-free rolling method of metallic materials in which the finished cross-sectional shape in the outer peripheral part is approximately complete roundness, the uneven diameter difference is extremely small and the cross-sec...
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JP3307294B2 |
To provide the method and device for manufacturing a seamless steel tube made of an Fe-base alloy whose Cr content is <15 wt.%, which are immediately applicable to existing manufacturing equipment by which a product steel tube reduced in...
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JP3305604B2 |
To prevent generation of inside surface scratch of steel tube and to manufacture seamless tube with excellent inside surface skin by manufacturing a rolling stock for seamless tube of specified shape and then piercing rolling the rolling...
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JP3304963B2 |
The disk roll exchanging apparatus of the present invention includes a pair of disk frames 6 which support disk rolls 3 and which are capable of swinging open, a disk roll lifting device 12 for mounting the disk roll to and demounting it...
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JP3297994B2 |
To obtain a rolling mill to cope with the production of small quantities in many kinds of seamless steel tubes sized from a small diameter to a large diameter by providing a means of turning a cannon holder and making it travel along a p...
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JP3287045B2 |
PURPOSE: To reduce the thermal load of a rolling roll by effectively heating the ring material which is rolled between upper and lower rolling rolls. CONSTITUTION: A guide roll 9 which is brought into contact with a ring material 3 to be...
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JP3282797B2 |
To automatically remove iron pieces stuck after burning to the outer peripheral surface of a roll without dismounting inclined rolls from the main body of the mill in the inclined roll mill provided with the inclined rolls which are arra...
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JP2002113507A |
To provide a plug for piercing a seamless steel tube which has a long life even in rolling of high-allow steel such as stainless steel and a Ni-base alloy and with which a tube excellent in the properties of the inside surface because of...
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JP2002103002A |
To provide a method for producing a cast billet having little porosity without applying rolling reduction to the cast billet after casting, and a method for producing a seamless steel tube having little internal flaw by using the round c...
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JP2002102924A |
To provide a method for detecting a plug dropout which requires no more measures to protect the environment preventing fumes and dust than before without imparting physically bad influences to workers and capable of preventing damage to ...
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JP2002066610A |
To provide a manufacturing device for a seamless metal pipe comprising a main roll having excellent abrasion resistance without loss of slip resistance, and to provide an effective manufacturing method for the seamless metal pipe.The man...
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JP3256162B2 |
To provide a manufacturing method for a welded steel pipe by which yield ratio in the axial direction of the tube that is only raised in the manufacturing process in a conventional method is lowered. In the manufacturing method of the we...
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JP2002028704A |
To improve the capacity of a planetary inclined rolling mill.The supply of a pipe shape 17 to be rolled to a roller nip is continuously performed in the state where its butt surface is abutted on the butt surface of the succeeding pipe s...
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JP3239894B2 |
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JP3239895B2 |
A piercer roll exchanging apparatus for use in a vertical piercing mill, as well as a piercer roll exchange method for use with the apparatus, which can automate the exchange of piercer rolls and which are suitable for flexible manufactu...
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JP3239799B2 |
To provide a manufacturing method of a seamless tube that is excellent in the durability of piercing plug. In this manufacturing method, a billet is arranged on the pass line of roll which are arranged obliquely to the advancing directio...
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JP3239896B2 |
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JP3239819B2 |
To absorb the fluctuation of a rolling load at the time of an abnormal rolling in manufacturing a seamless steel tube, and to simply repair the equipment of the rolling mill. On the rolling down device of this rolling mill, hydraulic cyl...
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JP2001340910A |
To provide a manufacturing method of a seamless steel pipe capable of restraining decrease of wall thickness of a pipe at a back end portion of the pipe more efficient than before, when expanding and reeling the pipe in a skew rolling mi...
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JP3228169B2 |
To obtain a piercing plug for a seamless metallic tube which restricts an adopted fault generating on the inside surface of a product tube and which does not reduce the life of the plug by making the thickness of scale skin film of a ree...
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JP2001300607A |
To provide a plug for improving the service life of the plug and the quality of the inside surface of a material to be rolled in the manufacture of a steel tube. The plug which is used for manufacturing the steel tube is composed of a ce...
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JP3224484B2 |
PURPOSE: To execute skew rolling of a metallic tube stably and at high efficiency. CONSTITUTION: A skew rolling device 13 has an inclined-angle imparting motor 26 for imparting an inclined angle β to forming rolls 20, roll-driving torqu...
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JP2001293506A |
To simplify the structure of a roll forming device, to reduce the manufacturing cost and to maintain the identity of the distance from each forming roller to the center of a work with high accuracy. In the roll forming device 30, the wor...
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JP2001276912A |
To provide a method for piercing rolling a seamless pipe by which an external diameter of a tip of a hollow material pipe can be controlled to enlarge and by which an external diameter deviation between the tip of the hollow material pip...
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JP3214379B2 |
To eliminate the defect of internal quality of a cast billet, to improve the production efficiency of a seamless steel pipe and to reduce the production cost by continuously casting a steel containing a prescribed wt.% or higher of Cr wi...
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JP3214377B2 |
To provide a producing method for a round cast billet which eliminates porosity and solidified structure, improves the internal quality of the cast billet and fully prevents the inner flaw at the time of pipe-making. The producing method...
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JP2001259711A |
To provide the inexpensive and simple manufacturing method of a seamless steel tube by which the damage in the body part of a plug is prevented when performing skew piercing of a billet of high alloy steel or the like.In a Mannesmann ske...
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JP2001259712A |
To provide a method capable of manufacturing a seamless steel tube excellent in quality without lowering productivity from a billet obtained by lengthwise-slitting a wide cast slab.In the method of manufacturing the seamless steel tube b...
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JP2001259710A |
To provide a roller shoe for skew rolling mills with which the slip of a base stock or a tube stock during rolling is suppressed, also tailing off is smoothed and the so called flare (the expansion of the diameter of an end part) and tor...
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JP2001259713A |
To provide an inexpensive and simple manufacturing method of a seamless steel tube by which damage in the body part of a plug is prevented when performing skew piercing of a billet of high alloy steel or the like.In a Mannesmann skew pie...
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JP2001232404A |
To provide a rolling method for a metallic pipe by which biting ability is improved and also the generation of fin flaws is prevented in sizing rolling with a sizing machine such as a sizer.A slip inhibitor in which a granular body is di...
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JP2001219206A |
To obtain compact and inexpensive manufacturing equipment with which seamless steel tubes of from ordinary steel to high alloy steel are manufactured by a manufacturing line for seamless steel tubes using an inclined piercer.In this equi...
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