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| Number | Title | Issue Date |
| 7988796 | Sheave member for belt-type continuously variable transmission and method of manufacturing the same A method of manufacturing a sheave member for a belt-type continuously variable transmission includes a forming step wherein an intermediate product having a sheave surface is formed by forging a steel material; a carburization step wherein the intermediate product ... | 08/02/2011 |
| 7815750 | Method of production of steel soft nitrided machine part The present invention provides a method of production of a steel soft nitrided machine part comprising: preparing a steel material containing, by mass %, C: 0.15-0.30%, Si: 0.03-1.00%, Mn: 0.20-1.5%, S: 0.04-0.06%, Cr: 0.01-0.5%, Mo: 0.40-1.5%, Nb: 0.005-0.05%, Ti: ... | 10/19/2010 |
| 7255758 | Steel wire and method of manufacturing the same A steel wire of pearlite structure containing 0.8-1.0 mass % of C and 0.8-1.5 mass % of Si is disclosed. In the cross section of the steel wire the difference in average hardness between a region up to 100 μm from the surface thereof and a deeper region is within 5... | 08/14/2007 |
| 7204005 | Manufacturing method of endless metal belt and manufacturing apparatus of endless metal belt A manufacturing method of an endless metal belt having metal rings built up and differing in circumference, includes the following steps of: a first circumference correction step of expanding each of the metal rings; and a second circumference correction step of exp... | 04/17/2007 |
| 7108756 | Method for heat-treating work pieces made of temperature-resistant steels A method of producing a workpiece of a heat-resistant steel, such as hot forming tool steel, where the workpiece may be hardened and depassivated after mechanical machining and electrochemical treatment. The hardening including a reduction step, so that no depassiva... | 09/19/2006 |
| 7074282 | Steel wire rod for hard drawn spring, drawn wire rod for hard drawn spring and hard drawn spring, and method for producing hard drawn spring Disclosed is a steel wire rod for hard-drawn springs capable of exhibiting fatigue strength and sag resistance equivalent to or higher than springs made of an oil-tempered wire. The steel wire rod contains carbon in a range from 0.5 to less than 0.7 mass %, silicon ... | 07/11/2006 |
| 7055244 | Method of manufacturing flat wire coil springs to improve fatigue life and avoid blue brittleness The present invention relates to a method of forming a coil of spring wire by winding a wire into a coil spring formed of a plurality of rings of the wire wherein each of the rings has a substantially constant strain rate. The forming speed of the wire being wound i... | 06/06/2006 |
| 7037383 | Process for producing a component from metal A process for producing a component of metal includes a) carrying out a heat treatment to harden the component, which ends with a heating process, especially with a tempering or microstructural transformation process, at a given temperature (TE); b) carry... | 05/02/2006 |
| 7018209 | Apparatus and methods for a shape memory spring actuator and display Various apparatus and methods for an actuator and display using one or more shape memory springs. A shape memory spring is heated and urges a pin to a first or extended position. The pin may be supported in the first position by a supporting mechanism. The shape mem... | 03/28/2006 |
| 7000320 | Process for manufacturing miniature ball bearings A process for manufacturing miniature ball bearings that reduces material loss to improve manufacturing efficiency. The process consists of obtaining an inner and outer ring blank by cutting a first blank, forging the first blank to obtain a final blank, and separat... | 02/21/2006 |
| 6978594 | Process for the manufacture of a disintegrating roll of an open-end spinning apparatus as well as a disintegrating roll made by such a process A sawtooth wire to be laid in a groove of a shredding-element-carrier of a disintegrating roll of an open-end spinning apparatus is brought into a shape, which essentially represents that shape, which the sawtooth wire is to assume on the shredding-element carrier. ... | 12/27/2005 |
| 6910948 | Needle bearing and method for grinding bearing parts thereof It is an object of the invention to provide a needle bearing which can prevent occurrence of flake and seizure in the bearing parts even under such severe lubricating condition as provided by a compressor for a car air conditioner or a planetary unit for an automati... | 06/28/2005 |
| 6902631 | Air-hardening, low to medium carbon steel for improved heat treatment A steel to be air-hardened as part of heat treatments such as hardening-and-tempering, induction hardening, carburizing, carbonitriding or nitriding comprising, in weight %: | 06/07/2005 |
| 6878218 | High strength gear and method of producing the same A high strength gear is provided which comprises a base metal of an iron-base alloy, the base metal being carburized or carbonitrided and having a tooth surface, and a coating containing Fe nitride and/or Fe carbonitride, formed on the tooth surface. A method of for... | 04/12/2005 |
| 6800144 | Process for producing retainer for constant velocity joint possessing improved machinability and flexural strength Disclosed is a process for producing a retainer for a constant velocity joint for automobiles or the like, which has improved flexural strength properties without sacrificing the machinability, using a steel corresponding to SCr 415 (JIS) or SCM 415 (JIS). This prod... | 10/05/2004 |
| 6790295 | Method of improving sliding surfaces in anti-seizure property A method of improving wear-resistance and anti-seizing properties of slide surface of machineries, such as outer slide surfaces of piston pins of vehicle engines, wherein slide surfaces of iron or steel base materials of machineries are first processed carburizing, ... | 09/14/2004 |
| 6723175 | Formed member made of steel sheet and method for producing same A method for producing a formed member made of a steel sheet according to the present invention is characterized by preparing a steel sheet material having tensile strength of 500 MPa or less and containing a nitriding element; forming a formed member having a prede... | 04/20/2004 |
| 6695930 | Process for case hardened dies in improving die life Steel alloys susceptible to case and core hardening comprise 0.05 to 0.24 wt % carbon; 15 to 28 wt % cobalt and 1.5 to 9.5 wt % in nickel, small percentages of one or more additives: chromium, molybdenum, and vanadium; and the balance iron. Carburized rol... | 02/24/2004 |
| 6627005 | High fatigue-strength steel wire and spring, and processes for producing these A steel wire of pearlite structure containing 0.8-1.0 mass % of C and 0.8-1.5 mass % of Si is disclosed. In the cross section of the steel wire the average hardness in a region up to 100 μm from the surface thereof is at least 50 higher that that in a de... | 09/30/2003 |
| 6620262 | Method of manufacturing inner and outer races of deep groove ball bearing in continuous annealing furnace The continuous annealing furnace has two or more treatment chambers sequentially connected with each other and respectively filled with a gas atmosphere differing in carburizing property, which includes a carburizing chamber wherein roller members to be t... | 09/16/2003 |
| 6589363 | Method for making heat treated stainless hydraulic components A stainless steel hydraulic component and method for making same hard turns a pre-heat treated stainless steel material, preferably a 400 series stainless steel material, provided in bar stock form in a single machining loading. Stainless steel hydraulic ... | 07/08/2003 |
| 6379473 | Method of manufacturing laminated ring using molten salt composition A laminated ring for use as a belt in transmitting power in a continuously variable transmission is produced by welding opposite ends of a sheet of maraging steel to produce a plurality of rings, and rolling said rings to a predetermined length. The rings... | 04/30/2002 |
| 6325867 | Rolling bearing and heat treatment method therefor A rolling bearing contains no more than 0.3 wt % of nitrogen in a grinding allowance portion after carbonitriding and hardening heat treatments, contains from 0.9 wt % (inclusive) up to 1.6 wt % (inclusive) of carbon and from 0.05 wt % (inclusive) up to 0... | 12/04/2001 |
| 6312529 | Steel compositions and methods of processing for producing cold-formed and carburized components with fine-grained microstructures Steel compositions and processes are described that provide optimum resistance to austenite grain coarsening in cold-formed and carburized components for automotive and machine structural applications. The steel compositions include, in weight percent, 0.... | 11/06/2001 |
| 6309475 | Rolling element and producing method For easily producing a toothed material for high-strength gears etc. with a plastic working technique, deformation resistance occurring in plastic working is reduced and stable high precision plastic working is enabled at lower temperatures. One or more t... | 10/30/2001 |
| 6294029 | Method of treating and smoothing sliding surface A surface treating and smoothing method of surface-treating and smoothing a sliding member including steps of finishing the sliding member by pressurized particle containing fluid blasting to a sliding surface with surface roughness ranging approximately ... | 09/25/2001 |
| 6153030 | Method for the manufacture of hollow shafts A method for the production of hollow shafts from welded or seamlessly produced steel tubes having a maximum carbon content of 0.35% includes (1) carburizing a tube to a carbon content greater than 0.5%; (2) slowly cooling the carburized steel tube down f... | 11/28/2000 |
| 6126897 | Carburizing steel and steel products manufactured making use of the carburizing steel A carburizing steel having the following chemical composition: C: 0.1 to 0.25%, Si: 0.2 to 0.4%, Mn: 0.3 to 0.9%, P: 0.02% or less, S: 0.001 to 0.15%, Cr: 0.5 to 0.9%, Mo: 0.15 to 1%, Al: 0.01 to 0.1%, B: 0.0005 to 0.009%, N: less than 0.006%, and the balance of Fe and ... | 10/03/2000 |
| 6117249 | Treating metallic machine parts A method of treating a metallic machine part to increase wear life and to change surface appearance comprising the steps of roughening the surface, thereafter changing its color by case hardening and, subsequently, increasing the lubricity of the case har... | 09/12/2000 |
| 6110296 | Thin strip casting of carbon steels A substantially carbon free (e.g. 50-80 ppm carbon max.) iron base melt is strip cast to provide a cast strip having a low strength, high ductility, essentially ferrite matrix substantially free of hardening acicular ferrite, bainite and martensite phases... | 08/29/2000 |
| 6053988 | Method for making piston rings A method and apparatus for making a piston ring in which a metal strip having a first coefficient of expansion is coiled about a special mandrel having a second greater coefficient of expansion and a threaded form that has a zero helix angle along most of... | 04/25/2000 |
| 6051080 | Rolling element used for toroidal-type continuously variable transmission and method for producing same The invention relates to a power roller used for a toroidal-type continuously variable transmission. This power roller has on its first side a groove for receiving a bearing, and the surface of the groove (bearing surface) has a carbon concentration which... | 04/18/2000 |
| 6027577 | Manufacturing method of valve spring superior in durability In a manufacturing method of a valve spring, a coiled valve spring made of an oil-tempered wire is applied with nitriding treatment and is supported to be rotated about its center axis. During a shot peening process of the coiled valve spring, cut wires o... | 02/22/2000 |
| 6024346 | Coil spring resistant to permanent set and fatigue By controlling the thickness of the nitrization layer formed on the surface, the coil spring made of spring steel may be made highly resistant to permanent set and fatigue. By carbonitriding the material of the coil spring to a depth of 20 to 50 μm from ... | 02/15/2000 |
| 5985044 | Forged, non-heat treated, nitrided steel parts and process of making Forged, nitrided steel parts having a high fatigue limit and bending toughness are produced without heat treatment for refining between the forging and nitriding. The steel has a composition consisting essentially, on a weight basis, of: 0.30-0.60% of C, ... | 11/16/1999 |
| 5916383 | Method of shot peening a hardened metal product with shot having high hardness A method for shot peening a hard metal product that has a hardened surface. The method includes projecting shot on the hardened surface of the hard metal product. The ratio of the Vickers hardness of the shot to that of the hardened surface is 0.8-1.6, an... | 06/29/1999 |
| 5868871 | Method and apparatus for carburizing, quenching and tempering Method and apparatus for carburizing, quenching and tempering workpieces, by which the step of carburizing can be incorporated into a machining and manufacturing process to be performed by an on-line machining and manufacturing system as one stage thereof... | 02/09/1999 |
| 5772795 | High strength deep drawing steel developed by reaction with ammonia A method of producing high strength steel sheet and formed articles fabricated from the sheet and containing about 0.01-0.3 free and uncombined atomic percent Ti, Nb or V as strengthening element, by hot rolling or hot rolling plus cold rolling the sheet ... | 06/30/1998 |
| 5759293 | Decarburization-annealed steel strip as an intermediate material for grain-oriented electrical steel strip A decarburization-annealed steel strip as an intermediate material for grain-oriented electrical steel strip having good secondary recrystallization and excellent electrical properties is provided by causing a steel strip to possess a micro-structure in w... | 06/02/1998 |
| 5718774 | Method of producing bevel gear A method of producing a bevel gear is provided. The method comprises the steps of forging, from a case hardened and heated blank, a rough shaped bevel gear intermediate product having a toothed portion, outer burrs at a larger diameter end thereof and bet... | 02/17/1998 |
