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Patent Searching and Data


Matches 851 - 900 out of 2,176

Document Document Title
JPH07275912A
PURPOSE: To prevent the generation of bad biting, bad running-out and the rupture of hollow by satisfying a specified relation by the wall thickness on the inlet side of a hollow tube stock of a material to be rolled, wall thickness of t...  
JPH07275908A
PURPOSE: To correct the thickness deviation of a tube stock after rolling by making the outside surface on the backside of a plug into a reeling part which is composed of a concave hyperboloid of revolution and making the distribution in...  
JPH07265910A
PURPOSE: To suppress generation of spiral uneven thickness as well as shear deformation by reversing a rotating direction of the stock to be rolled of one or more skew rolling processes against a rotating direction of the stock to be rol...  
JPH07256328A
PURPOSE: To suppress generation of the shoe marks occurring caused by seizure of guide shoes in piercing in seamless pipe production. CONSTITUTION: This method for lubricating outside surfaces in seamless pipe production comprises pierci...  
JPH0787961B2  
JPH0787930B2  
JPH0787929B2  
JPH07246403A
PURPOSE: To change the outside diameter of tube into an arbitrary size in a manufacturing line without generating the torsion and bend on the metallic tube. CONSTITUTION: Planetary type stretch reducers 3a, 3b, 3c in which plural rolling...  
JPH0785804B2  
JPH07241608A
PURPOSE: To suppress the variation in the longitudinal direction of the outside diameter of tube after rolling by making the rotational speed of rolling rolls during rolling the tip of a material to be rolled faster than the rotational s...  
JPH07241609A
PURPOSE: To suppress the variation in the longitudinal direction of the outside diameter of a tube after rolling by making the rotational speed of disk guide shoes during rolling the tip of a material to be rolled faster than the rotatio...  
JPH07241607A
PURPOSE: To improve the accuracy of external size of tube by setting the temp. of a tube stock on the inlet side of an expansion mill, also determining the actual temp. of the tube stock on the inlet side of this expansion mill, changing...  
JPH07241606A
PURPOSE: To suppress the variation of the outside diameter of tube in the longitu dinal direction after rolling by making the lead angles of rolling rolls during rolling the tip part of a material to be rolled smaller than the lead angle...  
JPH07227604A
PURPOSE: To manufacture a high Cr seamless steel pipe of high quality by supplying a ferrous oxide setting an iron oxide as a main component on a plug surface for punch from a billet side. CONSTITUTION: A hollow base stock is adjusted by...  
JPH0735603Y2  
JPH0775726B2  
JPH0775727B2  
JPH0735604Y2  
JPH07214114A
PURPOSE: To improve the dimensional accuracy of tube at the time of rolling a thin large-diameter tube having small wall-thickness to outside diameter ratio and to avoid the fin flowing due to the flaring of a stock tube. CONSTITUTION: I...  
JPH07214110A
PURPOSE: To stably execute the stripping of a mandrel bar from a base pipe. CONSTITUTION: In a retractable mandrel mill whose mandrel mill 1 and sizer 4 are arranged in tandem at a distance shorter than the length of the drawn base pipe,...  
JPH07214113A
PURPOSE: To prevent formation of burrs at the rear end of a base pipe in production of the base pipe for production of a steel pipe by piercing of a pipe material billet by a piercing plug and piercer roll. CONSTITUTION: The rear end fac...  
JPH07214112A
PURPOSE: To prevent formation of annular or fin-like burrs at the rear end of a base pipe in production of the base pipe for production of a steel pipe by piercing of a pipe material billet by a piercing plug and piercer roll. CONSTITUTI...  
JPH07214115A
PURPOSE: To execute high expansion rolling of tube by avoiding that a material to be rolled is fin flowed and broken from the clearance between a rolling roll and a guide shoe by the generation of flaring, and continuation of rolling is ...  
JPH07204711A
PURPOSE: To reduce frequency of exchanging a piercer bar cap, manpower and cost by preventing wear of the abutting surface of core metal of a piercer bar cap of an assel mill. CONSTITUTION: In the piercer bar cap 1 provided with a column...  
JPH0767590B2  
JPH07185607A
PURPOSE: To produce product pipes of a wide range of outside diameters from a continuously cast hollow pipe stock at low cost. CONSTITUTION: This rolling equipment train for seamless pipes is provided with an expansion rolling line for f...  
JPH07185609A
PURPOSE: To reform an existing mandrel mill line at low cost and to produce product pipes of larger outside diameters by composing rolling equipment for seamless pipes of a Mannesmann inclined piercer, a mandrel mill, a reheating furnace...  
JPH07185606A
PURPOSE: To provide guide shoes with guidability equal to the guidability of stationary type guide shoes and to permit rapid replacement of guide shoes by fixing respectively one piece among the plural guide shoes on a pair of base bodie...  
JPH07185610A
PURPOSE: To reform an existing mandrel mill line at low cost and to produce product pipes of larger outside diameters by composing rolling equipment for seamless pipes of a Mannesmann inclined piercer, a mandrel mill, a incline type expa...  
JPH07171606A
PURPOSE: To evade the defective biting, defective running-out of a material to be rolled and the breakage of a hollow by flaring, to increase the degree of freedom in rolling setting and to enable highly expanding/rolling a tube without ...  
JPH07164023A
PURPOSE: To attain a forming condition free from the generation of a roll mark by finding the generation limit line of the roll mark according to the ovalities of three roll stands, and limiting the ovalities of two roll stands and a dra...  
JPH07164020A
PURPOSE: To manufacture a seamless steel pipe by preventing the generation of a flaw on the inner surface of the pipe when piercing and rolling a cast billet cast continuously, using as a billet, and when piercing and rolling a cast bill...  
JPH07164022A
PURPOSE: To prevent an increase in a gap caused by the deformation and the shifting of a disk roll during rolling. CONSTITUTION: Disk rolls 2U and 2D are arranged opposite to each other in the vertical direction on both sides of a pass c...  
JPH07164021A
PURPOSE: To improve a peeling limit, and to reduce the generation factor of a guide shoe mark by that the projection of a piercing shell between a main roll and a guide shoe, becomes less. CONSTITUTION: When piercing a seamless steel pip...  
JPH07155806A
PURPOSE: To prevent generation of the torsion in a material to be rolled and additive shearing strain in a section even at the time of rolling high-alloy steel such as stainless steel and to prevent generation of failure of biting, defec...  
JPH07155805A
PURPOSE: To apply a lubricant without being affected by ejector effect caused by jetting high pressure water by mounting a lubricant jetting nozzle provided with guide nozzles which are isolated from a high pressure water jetting nozzle ...  
JPH07155808A
PURPOSE: To prevent generation of torsion in a material to be rolled and additive shearing strain in a section even at the time of rolling high alloy steel such as stainless steel and to prevent generation of failure of biting, defective...  
JPH07155807A
PURPOSE: To prevent the generation of failure of biting, to increase the degree of freedom in the setting of rolling and to improve yield and productivity in piercing. CONSTITUTION: In a skew rolling method of a seamless tube, face angle...  
JPH07148507A
PURPOSE: To improve the service life of a plug to be used in the piercing process when the seamless alloy steel tube is manufactured, and to improve the basic unit of the tool, the productivity and the quality of the inner surface. CONST...  
JPH07505092A  
JPH07136703A
PURPOSE: To reduce the generation of a flaw generated on an inner surface in the process of seamless rolling, to improve a quality, to improve a yield, and to enable to reduce the need of a flaw repair. CONSTITUTION: This method is a rol...  
JPH07136702A
PURPOSE: To suppress the occurrence of a defect generated on the inner surface of a tube by setting the absolute value of a strain defined by a specific formula within a specific range at the time of piercing a round billet by inclined r...  
JPH07132313A
PURPOSE: To efficiently perform descaling and coating of a lubricant on the inside surface of a tube immediately before an elongating process or reeling process for manufacturing a stainless tube. CONSTITUTION: The inside surface of a tu...  
JPH0745056B2  
JPH0745048B2  
JPH07124612A
PURPOSE: To provide a piercing method of a seamless metallic tube which can carry out piercing of a high tube expanding ratio stably without generating troubles such as choking, outside flaws of a tube, poor engagement and so forth. CONS...  
JPH0741292B2  
JPH0741291B2  
JPH07116709A
PURPOSE: To prevent seizure and to eliminate plunging flaws or the like by rolling a material to be rolled while supplying lubricant which adds solid lubricant into swollen mica base aq. solution between rolling rolls, guide shoes and th...  
JPH0718410Y2  

Matches 851 - 900 out of 2,176