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JP2003515671A |
A method of making high-strength steel structural members is disclosed by providing a flat-rolled blank of high-strength steel having a ferrite-pearlite microstructure and high-strength mechanical properties and cold forming the blank by...
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JP3403913B2 |
To provide a stock steel for a valve spring having high strength of 210 to 240kgf/mm2 tensile strength after oil tempering at a low cost. This steel is the one having a compsn. contg., by weight, 0.65 to 0.85% C, 1.90 to 2.40% Si, 0.50 t...
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JP3404067B2 |
PURPOSE: To easily manufacture a synchronous joint having a long service life by combining a core for the synchronous joint executing the surface- hardening with a core inserting member and slidingly processing while rotating in the same...
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JP2003514990A |
A composition and method for the manufacture of products of a precipitation hardenable martensitic stainless steel, the composition of which comprises at least 0.5% by weight of Cr and at least 0.5% by weight of Mo wherein the sum of Cr,...
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JP3398174B2 |
PURPOSE: To provide an extra fine steel wire with a specified wire diameter excellent in fatigue properties by recrystallizing a part of ferrite in a pearlitic structure subjected to wire drawing and to provide its producing method. CONS...
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JP3398552B2 |
Toprovide a stainless steel plate for flapper valve, combining excellent strength, fatigue characteristic, and corrosion resistance, which are required of a flapper valve for a high efficiency compressor, etc. This steel plate has a comp...
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JP3399838B2 |
To provide a method for manufacturing a hot-rolled product without surface defects from continuously cast piece. In this method for manufacturing an alloy material by hot- rolling, the surface of a CC cast piece made through continuous c...
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JP2003113418A |
To provide a new method for improving the fatigue life of metal materials, which solves problems in the conventional fatigue-improving methods for metal materials like reducing stress concentration and introducing compressive stress, as ...
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JP2003105498A |
To provide a steel wire for a high strength spring which can combinedly have high strength and satisfactory cold spring formability.The high strength spring has a composition containing, by mass, 0.55 to 0.65% C, 1.2 to 2.5% Si, 0.3 to 0...
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JP2003103310A |
To provide a machine structural member and its manufacturing method that can balance strength and working properties without requiring complicated processes even when the outside diameter or the wall thickness demanded varies greatly.An ...
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JP2003097671A |
To execute surface treatment of a worm at further lower cost while securing improvement of reverse rotation resistance and stability of a motor output performance.The small-sized motor with a worm reduction gear outputs drive torque from...
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JP3386931B2 |
PURPOSE: To prevent cold cracks of a cladding layer and to improve fatigue strength, in a hydraulic turbine member with a layer of cladding by welding, by affording a specific weld layer to a residual tensile stress of the last weld laye...
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JP3383179B2 |
To provide a method for improving the fatigue strength of a metallic member, and also to provide a metallic member improved in fatigue strength. A metallic material, causing volume expansion by transformation, is used, and this metallic ...
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JP2003055711A |
To provide a surface treatment method for a steel member by which fine and stable austenitic grains can be secured and the fatigue strength can be improved by performing a shot-peening on the steel member in a pre-stage of a step of rapi...
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JP2003055785A |
To suppress the generation of pitting corrosion, or the like, by reforming a surface of a metal mother die for electroforming when manufacturing the metal mother die by using stainless steel such as SUS304. In a cylindrical metal mother ...
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JP3379824B2 |
When a shot (26) having a hardness equal to or higher than a ferrous or nonferrous metal shot material (29) is blasted against the surface of the metal shot material (29) at the blasting speed of 80 m/s or above, the collision causes hea...
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JP2003039325A |
To provide a surface roughness adjusting method capable of efficiently imparting objective surface roughness to the surface of a metal body. Air having a pressure of ≤2 kg/cm2 is supplied from a floor 1 through an air supply pipe 2. Th...
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JP3374667B2 |
The present invention provides an outer ring for a high strength constant velocity joint which has an excellent torsional strength and torsional fatigue strength and can provide an improved processability, and a process for producing the...
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JP3373938B2 |
PURPOSE:To change residual stress of a welding part in a nuclear reactor pressure vessel in the compressive direction from the tensile direction, and prevent the occurrence of stress corrosion cracking by providing a cavitation nozzle ha...
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JP3373638B2 |
PURPOSE: To execute stress condition change of the metal surface not requiring reaction force compensation so as to increase working efficiency and improve reliability. CONSTITUTION: The surface of a work 2 is irradiated with a laser bea...
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JP3371490B2 |
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JP3363628B2 |
PURPOSE: To provide a stainless steel for fuel cells excellent in corrosion resistance to molten carbonate and hot workability even as the content of Cr and Ni is reduced at low cost. CONSTITUTION: This stainless steel contains ≤0.1wt....
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JP3354548B2 |
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JP3355294B2 |
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JP2002346677A |
To provide manufacturing methods for parts excellent in delayed fracture resistance and screw parts by easy treatment without using expensive alloy elements or shot peening. After a thread is preformed by applying pre-form rolling 14 to ...
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JP3350737B2 |
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JP3344903B2 |
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JP2002327237A |
To prolong the pitting fatigue life of automotive parts and the like, which are shot peened in order to prolong the dedendum fatigue life, because load surface pressure against a gear is increased along with recent miniaturization, weigh...
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JP3343371B2 |
PURPOSE: To reform the surface stress condition of an under-water metallic material efficiently by providing injection openings to form a straight jet and a rotary jet rotating around the straight jet. CONSTITUTION: At the ambiance of th...
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JP3343774B2 |
To put a forged aluminum wheel for trucks and buses to practical use by applying three kinds of working such as forging and pressing for the part between bolt holes, shot blast for attaching surfaces and burnishing for nut seats in the w...
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JP2002536548A |
A metallic alloy composition is manufactured into products such as press formed or stamped products or rolled products such as sheet, strip, rod, wire or band by one or more cold working steps with intermediate or final flash annealing. ...
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JP3340016B2 |
To produce a soft-nitriding steel for structural purpose having good machinability and excellent fatigue strength and small in heat treating strains. This soft-nitriding steel for structural purpose has a compsn. contg., by weight, 0.20 ...
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JP3333619B2 |
PURPOSE: To provide a method for manufacturing an extremely thick steel plate excellent in internal quality from a continuously cast slab by utilizing a forging press used ordinarily and efficiently pressing down porosities which are pre...
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JP3320105B2 |
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JP3317723B2 |
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JP3319276B2 |
To effectively reduce the initial friction coefficient in the sliding face. The sliding face of a sliding member is subjected to shot peening treatment using shots having 0.6 to 1.0mm grain size. Its friction coefficient can effectively ...
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JP2002235875A |
To provide a steel tube with high dimensional accuracy (for example steel tube for cylinder) which is excellent in manufacturing yield, hardly flawed, excellent in fatigue characteristic, inexpensive in manufacturing costs, and large in ...
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JP2002526271A |
The burnishing method and apparatus (100) for implementing the method of the present invention utilizes a single-point burnishing process to provide deep compression with a minimal amount of cold working an d surface hardening. In partic...
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JP3315153B2 |
PURPOSE: To provide the structure of a cavitation jet nozzle to activate the turbulance of a jet stream much more, and to give an adequate condition to expedite a cavitation. CONSTITUTION: The water fed through a high pressure water feed...
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JP2002525210A |
This method refers to a method by which the physical and mechanical properties intrinsic to a fine-grain structure may be formed in metal billets using pressure treatment. The method is designed to treat rods, bars and other particularly...
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JP3308766B2 |
PURPOSE: To provide a reactor material residual stress improving method that can improve the residual tensile stress of reactor material with simple constitution by making use of thermal shock distortion. CONSTITUTION: A nozzle 14 connec...
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JP3304403B2 |
PURPOSE: To reform the surface of a metallic material where a tensile stress resides so as to generate a contraction stress, by blowing in the air current near the upstream side of an exhaust nozzle to inject an under-water high pressure...
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JP3303030B2 |
To provide a connecting rod having a high fatigue strength and an excellent toughness. A connecting rod is made of iron base sintered alloyal having a composition of 0.2 to 5 wt.% of Cr, 1 to 6 wt.% of Ni 0.1 to 1.0 wt.% of C and the rem...
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JP3301088B2 |
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JP3299857B2 |
PURPOSE: To apply twisting to an extra fine steel wire and to stably produce a high strength extra fine steel wire excellent in fatigue characteristics by specifying the shape of a die used for wiredrawing and also specifying bending con...
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JP3300500B2 |
PURPOSE: To produce a ferrite + bainite type steel for hot forging excellent in fatigue strength, yield strength, and machinability by subjecting a steel material having a specific composition to hot forging and to cooling to form a spec...
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JP2002188702A |
To provide a rolling element for a continuously variable transmission such as a toroidal type continuously variable transmission, with a long rolling fatigue life and low dispersion of rolling fatigue lives and to provide a method for ma...
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JP3292654B2 |
To obtain a high strength gear having sufficient compressive residual stress and smooth surface from face of tooth to root of tooth. An apparatus for highly strengthening the gear is provided with a gear holding mechanism 16 for supporti...
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JP3292655B2 |
To surely improve the roughness of surface and the fatigue strength and to efficiently and surely remove glass bead waste stuck to the surface of a gear. Jet flow 22 of the glass beads 20 and water 18 is sprayed from a nozzle 72 toward t...
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JP2002166366A |
To provide a surface treatment method capable of easily increasing the fatigue strengths (compressive residual stresses) of the bottom and dedendum of a heat treated gear.This bottom and dedendum surface treatment method comprises the st...
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