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JP2546254Y2 |
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JP2646396B2 |
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JP2636689B2 |
PURPOSE: To attain stable shell shape and thickness distribution even in the case that the coefficient of friction of a bar is varied. CONSTITUTION: In the manufacturing method of a seamless tube by a mandrel mill method, the film thickn...
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JP2636683B2 |
PURPOSE: To eliminate a hot saw and to improve the yield of tube manufacturing by pressing down fins, over fillings which are generated by elongating with a mandrel mill and crushing allowance at the time of bar stripping by providing a ...
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JP2636690B2 |
PURPOSE: To restrain deterioration in quality and yield by discriminating rolling in the state of no mandrel bar at the time of mandrel mill rolling and controlling the projecting length of the mandrel bar. CONSTITUTION: A shell 2 is rol...
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JPH09182906A |
To reduce inner face angularness of a product by rotating a roll stand in the plane orthogonal crossing to a rolling pass line at a specified angle. A housing 1 is fixed on a rotatable cradle 2. A moving cradle 2 is fixed on a fixed crad...
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JPH09155414A |
To provide a tube stock of excellent dimensional accuracy by keeping a taper plug in the full-float condition with one pair of four-roll stands as large diameter roll and with the other pair as small diameter rolls to dispense with the p...
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JPH09108711A |
To eliminate uneven thickness produced in base stock, forming and bead grinding, to allow on-line tube making of a steel tube having a satisfactory dimensional precision comparable to a conventional drawn tube, and to obtain a technology...
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JPH09103821A |
To prevent such a case that the top end part or rear end part of a square steel tube, which is hot formed in a square tube forming machine, is not perfectly formed and taken out and deformed over considerable length in a producing method...
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JPH0999324A |
To produce a square tube having prescribed dimensions while being sufficiently form from a top end part to a rear end part by forming a plate stock into a polygonal hollow steel tube by a press forming machine, then heating and subjectin...
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JP2593123B2 |
PURPOSE: To provide a method by which the holding number of a mandrel bar and the frequency of handling are reduced and that is suitable to production of small lot/many kinds. CONSTITUTION: A mandrel bar cradle 1 is provided in the mandr...
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JP2530262Y2 |
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JP2591234B2 |
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JP2587350B2 |
PURPOSE: To manufacture a seamless steel tube with an equipment which is more inexpensive and more compact as compared with a mandrel mill rolling a steel tube by continuously using a mandrel bar. CONSTITUTION: In mandrel mills 35-38, a ...
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JP2587348B2 |
PURPOSE: To manufacture a seamless steel tube having an excellent inside properties and a uniform wall thickness by a mandrel mill composed of a row of four rolling mills. CONSTITUTION: In the method for manufacturing the seamless steel ...
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JPH0957307A |
To obtain a manufacturing method for a metallic tube having high elongation property and small variation by controlling atmosphere temp. and temp. of lubricating oil at the time of drawing a tube in the drawing method of a metallic tube....
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JPH0957306A |
To reduce manufacturing cost by respectively mounting a stretch reducer and a seam annealing device on other trucks and making them selectively exchangeable in an equipment train for manufacturing steel tubes. In a quick changing device ...
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JPH0952104A |
To provide a manufacturing method of seamless steel tubes variation in length of which is reduced and manufactured with a mandrel mill. The temp. of a mandrel bar before being inserted into a tube stock and temps. of rolls of the mandrel...
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JP2581907B2 |
PURPOSE: To prevent a flaw on the outside surface and the occurrence of the seizure of a tube stock, and to improve the quality of a product by controlling the transfer paths of the tube stock between respective stands, and arranging a p...
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JP2582705B2 |
PURPOSE: To form proper gap between a mandrel bar and a tubing even at both end parts of tube. CONSTITUTION: In a mandrel mill for rolling a tube which has plural groove 1 roll stands and which the mandrel bar 2 is arranged in an array o...
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JPH0938711A |
To obtain a pipe stock for finish-rolling having the objective reduced thickness pattern without any thickness deviation in a circu ferential direction at the time of performing a thinning rolling at the both pipe end parts by a final ro...
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JPH0924409A |
To execute thinning rolling by a thinning pattern free from thickness deviation in the circumferential direction at the tip and rear end of a tube by controlling the timing to start screw-down control of roll and roll opening/ closing sp...
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JP2564826B2 |
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JP2560412B2 |
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JP2555894B2 |
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JPH08300021A |
PURPOSE: To detect at high precision the timing of biting and slipping at the tube end of a tube stock to a stretch reducer. CONSTITUTION: A torsional torque is detected with a distortion gauge 13 in the driving shaft 12 of each stand of...
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JPH08300012A |
PURPOSE: To decrease angles in the peripheral direction of the inside surface of a product and to improve thickness deviation rate by arranging the rolls of roll stands imparting a specified angular displacement on a plane perpendicular ...
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JPH08300028A |
PURPOSE: To reduce occurrence of nonconformity and crop loss concerning the product shape of a steel tube formed by stretch-rolling and draw-rolling. CONSTITUTION: In stretch-rolling a hollow tube stock 24 by a stretch-rolling mill 20, t...
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JPH08300013A |
PURPOSE: To stably operate a mill and to improve yield by stably executing bar stripping of a mandrel mill. CONSTITUTION: The bar retained force in rolling is measured at only the final stand of the mandrel mill 4 and also 3μp(SB--SF)+F...
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JP2553985B2 |
PURPOSE: To roll a seamless steel tube in a mandrel mill which does not generate irregular wear and irregular surface temperature on a mandrel bar in continuous use of the same mandrel bar. CONSTITUTION: In rolling of the seamless steel ...
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JPH08294711A |
PURPOSE: To prolong the life of a mandrel bar by controlling the holding speed of the mandrel bar to respective specific times of inlet rolling speed and outlet rolling speed. CONSTITUTION: The holding speed of a mandrel bar 2 is control...
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JP2545947B2 |
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JP2543283B2 |
PURPOSE: To provide the process for production of the thin electric resistance welded steel pipe having the excellent roundness at the end of a small steel pipe. CONSTITUTION: Rolls are divided by ≥4 and the roll diameters are equaled ...
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JP2541311B2 |
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JPH08260048A |
PURPOSE: To prevent the occurrence of surface dacarburized layer and to increase the efficiency of spheroidizing heat treatment by applying hot stretch reducing to a rolling tube stock while controlling a structure, applying strain of a ...
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JP2540183B2 |
The method of the invention relates to the manufacturing of tubes of a continuously cast or the like billet by means of cold working, wherein the temperature of the material rises to the recrystallization range due to the influence of th...
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JPH08215713A |
PURPOSE: To ensure quality equal to that of products by mandrel rolling and to improve rolling efficiency by constituting a rolling mill train of a 2-roll type and 4-roll type rolling mills as an alternative rolling method of an existing...
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JP2526447B2 |
PURPOSE: To offer a planetary reeler for improving the shape of inside surface and accuracy of thickness of tube which is rolled with a rolling mill of mandrel mill. CONSTITUTION: The planetary reeler A is arranged on the downstream side...
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JPH08206707A |
PURPOSE: To secure the internal quality of products with a mandrel mill by executing one pass of elongating/rolling in a one stand mill consisting of four rolls. CONSTITUTION: This mill consists of a pair of upper and lower rolls 1 and a...
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JPH08197111A |
PURPOSE: To prevent roll slip and to completely eliminate the generation of the collision of a tube between respective stands by executing drooping to the speed of rotation of rolls of a reducer in accordance with the load of an electric...
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JP2514527B2 |
PURPOSE: To prevent the seizure of roll when the tapered part of a tube end is rolled, and to perform stable rolling. CONSTITUTION: Rolling oil coating devices 6, 7 are installed in the neighborhoods of the inlet sides 4a, 4b, 5a, 5b of ...
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JP2515000B2 |
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JP2512984B2 |
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JPH08168802A |
To eliminate the need for manual work changing of mandrels and to decrease thermal shock cracks by arranging a lubricant application station and drying a lubricant by the heat of the mandrels themselves and additively by the effect of ex...
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JPH08117816A |
PURPOSE: To attain a stable operation, and to improve quality by controlling shell tension between stands in a posterior stage according to a deviation between calculated shell tension and target shell tension. CONSTITUTION: The adjuster...
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JPH0890012A |
PURPOSE: To manufacture a seamless steel tube from a billet having a square cross section in one pass by making the shape of a piercing plug into a wedge shape or a pyramid shape in the tip part and into a cylindrical shape in the end pa...
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JPH0890043A |
PURPOSE: To prevent curburizing of tube inner surface by heating while filling the inside of tube with gas containing water vapor at the time of reheating of tube stock after mandrel rolling or at the time of auxiliary heating for soluti...
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JPH0810431Y2 |
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JPH0871616A |
PURPOSE: To realize the improvement of precision of the set gap of a grooved roll in the final stand. CONSTITUTION: Each stand 3 except the final stand 5 is constituted of the stand which consists of a pair of grooved rolls 2. Adjacent s...
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JPH0871612A |
PURPOSE: To reduce burn and seizing flaws that are generated at the time of rolling alloy steel contg. Cr with a mandrel mill. CONSTITUTION: In the mandrel mill in which plural roll stands are provided with a pair of rolls which are face...
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