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JP2004323912A |
To provide a coil spring (a high strength coil spring) of excellent set-in resistance and durability which is suitably applied to a valve spring for an automobile sustained under progressively high stress level in recent years.A wire of ...
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JP3583031B2 |
To prevent such damage as stress corrosion cracking by providing a structure where the jet containing cavitation bubbles from a nozzle is collided against a flat collision surface of a baffle body to change the direction of the jet and h...
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JP3582257B2 |
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JP3567691B2 |
A full enclosed die forging method utilizes a forging material which comprises crystal grains of different phases and whose recrystallization temperature is T1 and whose melting point is T2. And, while the forging material is enclosed in...
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JP3567717B2 |
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JP3561918B2 |
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JP2004525768A |
A method of making high carbon content steel engine components is disclosed. The method includes pre-processing a supply wire of high strength steel having a spheroidized carbide microstructure and high-strength mechanical properties, ap...
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JP3554505B2 |
The present invention provides a hot rolled steel wire rod or bar for machine structural use having, in the as-hot-rolled condition, cold workability equal to that of the conventional wire rods or bars softened through annealing after ho...
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JP3547050B2 |
To improve the fatigue strength of a carbon steel material over the whole material by a relatively easy means by applying the tension to the carbon steel material having a bainite structure of a specified mean hardness HRC, and giving th...
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JP3541419B2 |
PURPOSE: To produce the grain oriented magnetic steel sheet having low iron loss by forming linear groove in the direction intersecting to rolling direction on the surface of grain oriented magnetic steel sheet of finish annealed and int...
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JP2004190108A |
To provide a method for imparting a residual compressive stress by which the residual compressive stress can easily and surely be imparted even to the outer surface and the inner surface of a work having curved part of a prescribed thick...
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JP2004183101A |
To provide a method of producing a steel forging which can withstand fatigue stress on a high level.The production method is provided with: a stage where a steel comprising, by weight, 0.06 to 0.35% C, 0.5 to 2% Mn, a trace amount to 2% ...
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JP2004169103A |
To provide a method for producing a high strength wire rod which modifies the surface by performing an ultrasonic shock treating-working on the surface of the wire rod, steel wire, etc.In the method for producing the wire rod, the surfac...
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JP2004167519A |
To provide a method for preventing the delayed fracture of a steel structure by which the delayed fracture occurring in the stress concentrated part of a steel structure can be prevented, and to provide a method for producing a steel str...
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JP3537530B2 |
PURPOSE: To suppress edge cracks which are generated at the time of hot-rolling and to obtain hot-rolled stainless steel sheet at high yield. CONSTITUTION: The constituents of stainless steel to be hot-rolled is adjusted so that the cont...
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JP2004148414A |
To provide abrasive which prevents a deterioration in quality of the abrasive itself and polishes a workpiece into the one with high quality in a high yield in a short period of time, and enables an improvement in blast effects and produ...
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JP3524229B2 |
To provide machine parts made of high toughness case hardening steel, excellent in wear resistance, fatigue characteristic, and impact resistance, at a low cost by applying carburizing and quenching to steel parts containing specific amo...
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JP2004130314A |
To provide a stress corrosion cracking suppressing method for preventing or suppressing stress corrosion cracking of a plate for a pipe and a vessel.A heat treatment condition to improve the material quality of a treated face side and to...
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JP2004130321A |
To provide a cold-worked steel product with which even in the case of giving a load exceeding elastic range during use, the development of brittle fracture can be avoided.In the cold-worked steel product which receives the large plastic ...
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JP2004124227A |
To provide a method for hardening the surface of a metal product by which the formation of hardened structure on the surface part of the metal product is performed not by martensitic transformation but by nanocrystallizing crystal grain ...
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JP2004116754A |
To provide a dynamic pressure bearing with high rotating accuracy and high reliability.The dynamic pressure bearing of a small-sized motor is formed of a specific non-magnetic steel material having excellent workability, wear resistance,...
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JP3512720B2 |
To enhance abrasion resistance, surface-roughness holding properties and dendrite resistance with little change of surface roughness before and after the modification of a roll surface, by modifying the roll surface with a high- speed co...
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JP3512463B2 |
PURPOSE: To obtain a high strength steel for machine structural use, excellent in delayed fracture resistance and hydrogen infiltration resistance by specifying the chemical composition and tempering temp. of a steel and further applying...
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JP3506267B2 |
PURPOSE: To provide a steel core aluminum stranded wire in which both the corrosion-proof property and the loosening property are satisfied concurrently. CONSTITUTION: The tension member 16 of a steel core aluminum stranded wire 11 is co...
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JP3506088B2 |
To provide a martensitic stainless steel excellent in corrosion resistance after fatigue and usable as a coiled tubing for a pipeline for the production/transportation of petroleum/natural gas. The stainless steel has a composition conta...
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JP3502744B2 |
To provide shaft-shaped parts for machine structural use, having a hole perpendicular to axial direction and excellent in fatigue characteristic. The shaft-shaped parts for machine structural use are manufactured by using a steel for ind...
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JP2004050362A |
To provide a method capable of adjusting a load-displacement characteristic of a disc spring to a desired characteristic.In the manufacturing step of a diaphragm spring 73, a slit 73c and an oval hole 73d are punched on a disc-like plate...
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JP3493722B2 |
PURPOSE: To provide a method for producing a ferritic stainless steel strip having excellent r-value and ridging resistance and small in intra-plane anisotropy and, particularily, excellent in buldging formability. CONSTITUTION: In the m...
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JP2004502028A |
A method for densification of the surface layer of an optionally sintered powder metal component comprising the steps of decarburizing the surface layer for softening the surface layer of the component, and densifying the surface layer o...
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JP3486753B2 |
PURPOSE: To obtain bearing parts excellent in toughness and having superior indentation resistance and wear resistance at the surface and high resistance to the propagation of cracks and, as a result, capable of improving the service lif...
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JP3478381B2 |
To provide a method for producing a non-refining forged article excellent in machinability and fatigue strength after compressive working such as roll working. Steel contg., by weight, 0.15 to 0.45% C, 0.10 to 0.80% Si, 0.50 to 1.50% Mn,...
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JP2003533592A |
Martensitic stainless steel with high resistance to corrosion, consisting of the following ingredients: Mn from 0.1 % to 0.3 %, P
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JP3464682B2 |
PURPOSE: To improve the surface stress condition of an under-water structure by setting a cover surrounding a cavitation jet to a nozzle to open toward the surface of a steel material to be a processing object. CONSTITUTION: Inside a cov...
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JP3465112B2 |
PURPOSE: To provide a method and an apparatus, in which the wear resistance is improved by highly hardening the surface and the dimension of the treated product is made to high accuracy and further the fatigue strength is improved. CONST...
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JP3460891B2 |
PURPOSE: To make improvements in the fatigue strength of a rolling surface and the bending fatigue strength of a nonrolling surface by forming a rolling element with mechanical structural steel, processing it through prasma high content ...
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JP2003290971A |
To provide long-term usability and to prevent the occurrence of stress corrosion cracking by additionally improving the resistance to stress corrosion cracking.Heat-affected zones 4 of a weld zone 3 formed by welding austenitic stainless...
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JP2003290970A |
To stably obtain a welded joint for steel structure with improved fatigue resistance by applying an AC magnetic field so that a magneto-striction at the molding part is made to resonate.The fatigue resistance at the welded part is improv...
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JP3456995B2 |
A method for work-hardening a component to be loaded along a loading axis includes rolling in a notch extending approximately at right angles to the loading axis. The notch has a minimum radius of curvature to be determined in a cross-se...
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JP2003528272A |
A method for finishing the surface of a rolling contact component, such as a bearing roller element, a bearing ring or a traction drive rolling element, comprises the steps of: carrying out a cutting operation on the surface, subsequentl...
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JP2003230927A |
To provide a manufacturing method for a rough shape material for a bearing ring which solves the problem of a long machining time required for a grinding process to remove the quenching strain of a ring material which is cold-rolled and ...
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JP2003211360A |
To provide a method and a device for surface treatment such as descaling or surface roughening of a steel plate and shape steel with excellent surface finish in a small treatment place without requiring special skill.In this method and d...
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JP2003211357A |
To provide a method for improving the life of a gear and driving force transmission parts that can provide sufficient residual compressive stress by a simpler method for the improvement of life even to gear and driving force transmission...
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JP3431066B2 |
To improve the fatigue fracture resistance of a spring by projecting hard metal particles, having hardness not lower than a specific Hv value and equal to or lower than the outermost-layer hardness of a spring, onto the surface of a spri...
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JP2003522026A |
A method for cold working metal structures. A compound indenter is used to produce deformation in a workpiece, to provide a selected beneficial residual stress profile, to provide improved fatigue life structures with minimal manufacturi...
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JP2003183808A |
To provide a cheap mechanical structural part excellent in face pressure resistance and bending fatigue strength.A microcarbide-dispersed carburized layer 2 with a thickness of 0.2 mm is formed by gas carburization and is strengthened by...
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JP2003183730A |
To solve such a problem that it has been difficult to inexpensively manufacture a metallic material having ultrafine grains of 5 μm or less on the surface, though ultra-refining of crystal grains of the metallic material is effective on...
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JP2003183729A |
To provide stainless steel which can be cold-worked and has superior outgas characteristics and machinability.The stainless steel comprised, by mass%, 0.1% or less C, 0.05-2.00% Si, 0.5% or less Mn, 16-25% Cr, 0.01-0.3% Te, and 0.005-0.0...
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JP3420326B2 |
PURPOSE: To provide a producing technique of a steel parts having excellent cold-forgeability, machinability, mechanical property and fatigue strength. CONSTITUTION: The steel blank containing 0.15-1.5wt.% C as graphite is formed by work...
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JP3420568B2 |
To provide a surface-treated alloy having a low thermal expansion coefficient in which the occurrence of a stress corrosion cracking can be prevented. The surface of a first base material 6 is coated with a first cathodic protective coat...
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JP2003170353A |
To provide a manufacturing method of a valve spring capable of restraining surface roughness low and giving high compression residual stress to the neighborhood of a surface and the valve spring.Shot-peening is carried out by using amorp...
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