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Patent Searching and Data


Matches 651 - 700 out of 2,058

Document Document Title
JP2591386B2
PURPOSE: To prevent carburization, which tends to be a problem when graphite lubricant is used, and to prevent the dents on the inside of a pipe due to oxide scale. CONSTITUTION: A mixture of a calcium compound and graphite is used as th...  
JPH08332504A
PURPOSE: To manufacture a seamless tube consisting of high alloy steel or the like at high efficiency of rolling. CONSTITUTION: A billet 1 consists of an allay steel contg. at least ≥5wt.% Cr or Ni, or an alloy consisting essentially o...  
JP2586772B2
PURPOSE: To reduce the uneven wall thickness and produce less inner surface flaws during the inclined drawing and rolling operation. CONSTITUTION: The length Lt of the part where a plug is brought into contact with the material is set 6...  
JP2586280B2
PURPOSE: To enable high degree lubrication by rolling after the uniformizing treatment of a lubricant which is applied to a material to be rolled and leaving it for a specified time. CONSTITUTION: The material 1 to be rolled is piercing ...  
JP2586246B2
PURPOSE: To restrain indentation flaws by inside scales of a hot seamless tube manufactured by piercing and strech-rolling. CONSTITUTION: The inside temperature of the material which is being elongated by rolling is restrained below the ...  
JP2586274B2
PURPOSE: To prevent fouling and stripe-like flaws that are generated at the time of manufacturing a seamless steel tube from a stainless steel by making the thickness of a scale layer which is stuck to the outer surface of a solid billet...  
JP2560412B2  
JPH08309408A
PURPOSE: To manufacture a seamless pipe made of a high alloyed steel, etc., with high rolling efficiency. CONSTITUTION: A billet made of an alloyed steel containing Cr or Ni with at least 5wt.% or over or an alloy whose main components a...  
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...  
JP2554703B2  
JPH08294712A
PURPOSE: To provide a piercing rolling mill which can execute piercing rolling of a tube stock having large thickness/outside diameter ratio without incurring generation of tail shrink, erosion of plug tip part and deformation of a mandr...  
JP2580098B2
PURPOSE: To manufacture a high-accuracy bar by executing the skew rolling of a rolled stock by revolving rolls in accordance with a ring having tapered parts on the inside peripheral surface. CONSTITUTION: A rolling device for a bar and ...  
JPH08281311A
PURPOSE: To extend the change range of the outlet-side diameter without deteriorate thickness deviation by arranging fixed type guide shoes facing to each other across the pass line by dividing them on the inlet side and the outlet side ...  
JP2572188B2
PURPOSE: To provide a piercing rolling method for a seamless steel tube by which even hard-to-work material can be efficiently piercing rolled at a low cost. CONSTITUTION: In a method by which the seamless steel tube is piercing rolled u...  
JPH08257609A
To provide a device for executing skew rolling of tube-shaped or bar-shaped rolling stock. In order to feed a rolling stock, a roll 2, whose roll axis 4 is, seen in the direction of longitudinal axis 3 of the rolling stock, inclined to t...  
JPH08257610A
To improve safety and productivity and to make constitution of device compact by closing four directions of rotors of assel mill type rolling device for executing skew rolling of tube- and bar-shaped rolling stock and supporting rotors f...  
JP2540183B2  
JP2561404B2
PURPOSE: To provide a skew rolling mill for a shafting with which stable rolling can be executed even when elongating rolls are worn, the adjustment of rolling reduction can be easily executed, the difference between circumferential spee...  
JPH08232018A
PURPOSE: To obtain rolling conditions capable of preventing the occurrence of cracks and flaws by specifying strain at the time of forming a high Cr ferritic steel of specific composition into a stock for seamless steel tube under specif...  
JPH08229606A
PURPOSE: To provide a method for rolling a seamless steel tube of a high Cr ferritic steel pipe containing Mo, W and having high creep strength. CONSTITUTION: In rolling of a seamless steel tube made of high Cr ferritic steel contg. Mo, ...  
JPH08215715A
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...  
JPH08215716A
PURPOSE: To provide a plug material excellent in erosion resistance and crack resistance for obtaining stably and efficiently the excellent quality of a product pipe in the manufacture of a high alloy seamless steel pipe, and to provide ...  
JPH08215714A
PURPOSE: To prevent the generation of flaws on the outside of a shell due to miss roll and burning, to improve production efficiency and to extend performable range even when the thin-walled hollow shell is rolled at high expansion ratio...  
JP2525961B2  
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...  
JPH08209245A
PURPOSE: To obtain a seamless steel pipe excellent in cold workability at a low cost by reheating a pipe stock constituted of an austenitic stainless steel in which the content of C is regulated, subjecting the same to hot rolling at a s...  
JPH08206711A
PURPOSE: To change a plug at the stage when the life of the plug is expired without monitoring the damaged state by measuring the surface temp. at the tip of the plug after rolling and before cooling and changing the plug at the point of...  
JPH08206710A
PURPOSE: To more effectively prolong the life of a plug by optimizing the coating quantity of a lubricant on the surface of the plug in accordance with rolling conditions. CONSTITUTION: As for the coating quantity of the lubricant on the...  
JPH08197114A
PURPOSE: To secure a state lubricated with fluid so that the scale on the surface of a plug can be protected on the surface of the plug and to prolong the life of the plug by applying a lubricant consisting of a water-glass base water so...  
JPH08197113A
PURPOSE: To prolong the life of a plug by applying a water-glass base lubricant whose viscosity is specified at a specified temp. on the surface of the plug. CONSTITUTION: When the plug 12 is situated in front of lubricant applying heade...  
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 ...  
JPH08174013A
PURPOSE: To obtain a hollow tube stock minimized in eccentric spiral thickness deviation by specifying the relationship between the diameter of a hollow billet and the interval between inclined rolls at the time of obtaining the hollow t...  
JPH08174051A
PURPOSE: To greatly decrease the voids from a joint boundary by cold drawing a blank in the state of coupling the mouth drawing part of an outside pipe and the mouth drawing part of an inside pipe, then sufficiently soaking and heating t...  
JP2508862B2  
JPH08155505A
PURPOSE: To avoid the increase in the working degree in the two roll stand rows, and to reduce the bar changing work and the cost by changing the wall thickness as large as the wall thickness change of a finished tube on the stock tube s...  
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...  
JPH08117819A
PURPOSE: To enable the secure improvement of the life of a plug by applying lubricant made from water glass solution after a water film on the surface of the plug vaporized. CONSTITUTION: In an inclined rolling mill, rolling rolls are ar...  
JPH08117817A
PURPOSE: To easily prolong the life of a tool for a hot working, such as a plug for rolling a seamless steel pipe to be used under a severe condition like the rolling of a high alloy steel. CONSTITUTION: In the inclined rolling method fo...  
JPH08117818A
PURPOSE: To improve the life of a plug by applying lubricant on the whole surface of a plug before a rolling stock is rolled. CONSTITUTION: In an inclined rolling mill 10, piercing is performed with upper and lower rolling rolls 11 arran...  
JPH08117814A
PURPOSE: To provide a manufacturing method of a seamless steel pipe of excellent performance at high productivity with inexpensive equipment and manufacturing equipment train therefor. CONSTITUTION: A round billet is directly manufacture...  
JPH08117815A
PURPOSE: To improve the durability of a piercing plug in manufacture of a seamless steel pipe and to prolong its life. CONSTITUTION: A hollow base stock is made by hot piercing a billet consisting of alloy steel with the piercing plug an...  
JPH08103808A
PURPOSE: To provide the easy, safe and precise aligning method. CONSTITUTION: In the aligning method of rolling mill which executes measurement from the reference face of a housing 1 by use of a jig 14, while the jig 14 is placed between...  
JPH0890258A
PURPOSE: To prevent the cracking of the outer shell and the generation of the defective joining by heating an outer tube immediately before achieving the incline rolling so as to be higher in temperature compared with an inner tube by an...  
JPH0890013A
PURPOSE: To simplify a roll elevating/lowering mechanism and to contrive the space-saving and improved rigidity of the main body of a forming-roll supporting machine by rotating forming rolls having high cross angles in the converging di...  
JPH0824942B2  
JPH0824941B2  
JPH0824934B2  
JPH0866703A
To reduce an outer diameter or a wall thickness by rolling a cylindrical hollow body, which is fed into an Assel mill from a front part, by approaching a prereducer roll to the hollow body at a specified adjusting speed to be slowly and ...  
JPH0866704A
To provide a method for diagonal piercing rolling which is capable of averting the incorrect rolling and working hindrance of thick or thin tube stocks of an about middle extent and a diagonal piecing roll stand for this purpose. This ma...  
JPH0857533A
PURPOSE: To provide a clad bar, which has a proper thin diffusion layer in its joined part, and a manufacture thereof. CONSTITUTION: First, descaling is performed on the inner surface of a titan pipe and the outer surface of a copper rou...  

Matches 651 - 700 out of 2,058