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Patent Searching and Data


Matches 201 - 250 out of 1,579

Document Document Title
JP6015270B2  
JP5976227B2
The invention relates to a method for producing a tube (2) or tubular pre-product from a solid billet in a rolling mill, comprising at least one roll (5a, 5b) acting from the outside on the solid billet or tubular pre-product and a mandr...  
JP5962197B2  
JP5883950B2
The rolling stand comprises four support columns (2), two conical rolling rolls with skewed rolling axes which are oblique to each other and are fixed to two roll cradles (6, 7), four jacks (24, 26) below the lower roll cradle (7) for ex...  
JP5858206B1
Between the large-diameter cone-shaped main rolls (1, 1') that are opposed to each other on the left, right, or top and bottom across the pass line (XX), and the main rolls that are opposed to each other, and above or below or above and ...  
JP5845894B2  
JP5816136B2  
JP5807509B2  
JP5779709B2
A rolling plant (R) for rolling tubes having a multi-stand rolling mill (5) with two or more rolls, in order to implement a controlled speed mandrel rolling process, comprises a hooking and releasing device (61) which is arranged in the ...  
JP5765191B2  
JP5709984B2
The invention relates to a method for producing seamless pipes of heated massive metal blocks, by means of a mandrel (4), which is fastened on a rolling rod (5), in the case of which a coating material is applied onto the inner side of t...  
JP5691937B2  
JP5648626B2  
JP5591311B2  
JP5565533B1
A powder lubricant composition according to the present invention includes 65 parts by mass to 95 parts by mass of sodium borate, and 5 parts by mass to 35 parts by mass of cryolite. A method for manufacturing a seamless steel pipe accor...  
JP5504831B2  
JP5482976B1
A plug for hot pipe making includes a plurality of plug pieces which is attachable to and detachable from one another, and a connection member which connects the plug pieces by a magnetic force. One of the plug pieces connected to each o...  
JP5482975B1
An inner surface regulation tool includes a mandrel, a plug which is detachably connected to the mandrel, and a connection member which connects the plug and the mandrel by a magnetic force. One of the plug and the mandrel includes a col...  
JP5464300B1
To increase the life of a plug used in a piercing machine for piercing-rolling a billet. The plug (10) is used in a piercing machine (30) that piercing-rolls a billet (36). The plug (10) includes a plug body (12), a build-up layer (14), ...  
JP5459347B2
Provided is a round billet capable of reducing damage on a piercing plug in a method of producing a seamless metal tube with a Mannesmann process. The round billet (5), for use in a seamless metal tube, to be produced into a seamless met...  
JP5440741B1
It is an objective to provide a plug capable of enhancing a usage count of the plug, which is for use in a piercing machine for piercing-rolling a billet, and a regenerating method of the plug. The plug (10) is for use in a piercing mach...  
JP5365724B2
Provided is an equipment system for producing a piercing-rolling plug to be used for producing a seamless steel tube/pipe, which includes a shotblasting device for applying shotblasting on a surface of the plug, and an arc-spraying devic...  
JP5365723B2
A method for producing a plug for use in a piercing rolling mill for producing a seamless steel tube/pipe includes an arc-spraying step of melting iron wires, and spraying molten material thereof onto a surface of a base metal of a plug ...  
JP5339016B1
The plug manufacturing method used in the drilling and rolling mill used to manufacture seamless steel pipes is a shot blasting process in which the surface of the plug is shot blasted and a sprayed wire sprayed on the surface of the bas...  
JP5334325B2
To provide a device for forming a deep hole of a hollow component allowing processing at a high load by preventing deformation due to self-weight of a heated workpiece, and excelling in its work efficiency and a product yield. The device...  
JP5277908B2
To provide a piercing rolling method for a billet by which the occurrence of scratches on the inner surface at a distal end part of a seamless steel tube is prevented advantageously. In the piercing rolling method for a billet performing...  
JP5277907B2
To provide a piercing rolling method for a billet by which the occurrence of scratches on the inner surface at a distal end part of a seamless steel tube is prevented advantageously. In the piercing rolling method for a billet performing...  
JP5273231B2
Provided is a seamless-metal-pipe manufacturing method whereby cracking of the inner surface of the pipe is inhibited. The seamless-metal-pipe manufacturing method in this embodiment is provided with the following steps: a step (S2) in w...  
JP5273230B2
Provided is a seamless-metal-pipe manufacturing method whereby cracking of the pipe when in a molten state is inhibited. The seamless-metal-pipe manufacturing method in this embodiment is provided with the following steps: a step (S2) in...  
JP5273272B1
This method for producing a plug used in a piercing mill used in the production of a seamless steel pipe includes: a shot blasting step for shot blasting the surface of a plug; and an arc spray step for forming a coating film by arc spra...  
JP5277909B2
To provide a piercing rolling method for a billet by which scratches on the inner surface at a distal end part of a material to be rolled hardly occurs in piercing rolling a billet (seamless steel tube base stock) by means of a piercer s...  
JPWO2011148613A1
Using a 3-roll type constant diameter rolling mill, the outer diameter of the (i) th stand is ρiWhen (%) is expressed by the following formula (1), constant diameter rolling is performed under the condition that the outer diameter work ...  
JP5235419B2  
JP5187470B1
There is provided a piercing apparatus in which the occurrence of an inner surface flaw in a hollow shell is suppressed. A piercing apparatus (10) according to an embodiment of the present invention is the piercing apparatus (10) which p...  
JP5177261B2
The present invention provides a controlled rolling method of a seamless steel tube excellent in strength and low-temperature toughness to be applied to a process of making a seamless steel tube, and this controlled rolling method compri...  
JP5169982B2
A plug includes a front edge portion having a convex curvature; a cylindrical portion having a truly or nearly cylindrical shape; a trunk portion having an outer diameter gradually increasing toward a rear edge thereof; a mandrel joint p...  
JP5142232B2
When performing piercing-rolling by use of a plug with a protection film on its surface, applying a lubricant made of an aqueous solution containing a total of 5 to 30% mass% of one or more of boron oxide, boric acid, and amine borate to...  
JP5131702B2
A plug material having a prescribed shape is prepared, the prepared plug material is thermally treated in a heat treatment atmosphere that contains at least 1.0 vol.% oxygen at a heat treatment temperature of at least 950°C and less tha...  
JP5103387B2
The invention relates to an apparatus for making a seamless hollow body (10) from a solid round block (7) of steel with a diameter <95% of the diameter of the solid round block by means of a two-roll cross-rolling mill with a piercing ma...  
JP5098477B2
A pusher device 4 includes a cylinder device 30 and a pusher mandrel 34. The cylinder device 30 includes a cylinder shaft 32. The pusher mandrel 34 is attached to the tip end of the cylinder shaft 32. The tip end of the pusher mandrel 34...  
JP5082509B2  
JP5071476B2
A piercing mill 10 includes a plurality of inclined rolls 1, a plug 2, a pusher 4, and a guide roll 6. The pusher 4 pushes a round billet 20 from the rear end at least until the round billet 20 advances for a prescribed distance after co...  
JP5056990B2
The production method of a round bar for a seamless tube in which a continuously cast slab with a rectangular cross section, and made of high alloy containing Cr of 20 to 30 mass%, Ni of 30 to 50 mass%, and at least one of Mo and W as Mo...  
JP5012992B2
By using a piercing mill that includes a pusher on the entrance side, a plug on the exit side along a pass line, and a plurality of angled rolls as being provided around the plug so as face to each other, in the case where the maximum di...  
JP5003151B2
a billet made of high Cr-high Ni alloy, which contains, by mass percent, 20 to 30 % of Cr, 30 to 50 % of Ni, and at least one element selected from Mo and W with a value "Mo + 0.5 W" of 1.5 % or more is heated under conditions satisfying...  
JP5000805B2
A heat resistant austenitic stainless steel with high strength at elevated temperatures, good steam oxidation resistance, good fire side corrosion resistance, and a sufficient structural stability, suitable for use in boilers operating a...  
JP4958346B2  
JP4952242B2  
JP4947450B2
The object is to provide a method of detecting a fault which ensures high-accuracy detection of a fault in piercing-rolling. A piercing-rolling mill 10 is provided with piercer rolls 1a, 1b, a piercer plug 3, a rolling load sensor 4, a t...  
JP4930002B2
An object of the invention is to provide a technology of manufacturing seamless pipes excellent in quality features with high productivity. Thus is provided a method of manufacturing seamless pipes by carrying out piercing-rolling using ...  

Matches 201 - 250 out of 1,579