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| Number | Title | Issue Date |
| 7914630 | Method for producing mat-surfaced austenitic stainless steel strips The subject of the invention is a process for the continuous manufacture of an austenitic stainless steel strip having a dull surface appearance, consisting in subjecting an austenitic stainless steel strip to a heat treatment in a bright annealing furnace inside wh... | 03/29/2011 |
| 7648600 | Heat treating device and heat treating method A heat treatment apparatus 10 comprises a supporting unit 20 for supporting a columnar workpiece 12 turnably, and an induction-heating coil 30 for induction-heating the workpiece 12 supported turnably by the supporting unit 20 | 01/19/2010 |
| 7422643 | Rolling element and method of producing the same There is provided an inexpensive rolling element used under high interface pressure such as induction hardened gears, the rolling element being improved in the seizure resistance of its tooth flanks and having a temper hardness of HRC 50 or more at 300° C. To this ... | 09/09/2008 |
| 7393421 | Method for in-die shaping and quenching of martensitic tubular body A process that combines tubular body pressure induced shaping at elevated temperatures with a controlled rapid quenching operation using a gaseous quenching medium in a common unit. The achievable cooling rate permits the in-die shaping and quenching of tubular stru... | 07/01/2008 |
| 7388177 | Mobile induction brazing and quenching machine An induction brazing and quenching apparatus and related method of coupling components together. ... | 06/17/2008 |
| 7302821 | Techniques for manufacturing a product using electric current during plastic deformation of material A technique for manufacturing a product involves receiving material, providing plastic deformation to the material to at least partially form the product, and applying electric current to the material while providing the plastic deformation to the material. The elec... | 12/04/2007 |
| 6939418 | Process for the thermomechanical treatment of steel A process for thermomechanical treatment of steel for torsionally-strained spring elements, the initial material being heated with a heating rate of at least 50 K/s and austenitized, and then, being formed in at least one forming step with the formed product being q... | 09/06/2005 |
| 6638380 | Method for making a cold rolled steel strip for deep-drawing A method for making a low carbon and low manganese cold rolled steel strip for deep-drawing whereby a steel strip hot rolled in the austenistic region coiled at the end of the high temperature hot rolling process (680° C. | 10/28/2003 |
| 6458226 | Process for the thermomechanical treatment of steel A process for thermomechanical treatment of steel for torsionally-strained spring elements, the initial material being heated with a heating rate of at least 50 K/s and austenitized, and then, being formed in at least one forming step with the formed prod... | 10/01/2002 |
| 6454884 | Method of manufacturing a vehicle structural beam A vehicle structural beam, such as a door intrusion beam, which possesses an elongate tubular beam part which at opposite ends is provided with mounting flanges for securement to a vehicle frame. The elongate tubular beam part and the flanges provided at ... | 09/24/2002 |
| 6402862 | Method of hardening a bushing of a track chain A method of hardening a work piece having (i) an outer surface, (ii) an inner surface which defines a passageway extending through the work piece, and (iii) an end. The method includes the steps of (A) advancing the work piece through a first induction co... | 06/11/2002 |
| 6270595 | Bushing for crawler belt and method of manufacture Crawler belt bushings and heir producing methods, with which productivity and cost performance can be improved over the carburization treatment and the induction hardening treatment. After a workpiece made from steel is heated from its outer circumferenti... | 08/07/2001 |
| 6264768 | Method for strengthening of rolling element bearings by thermal-mechanical net shape finish forming technique A method and apparatus disclosed for cost-effective net shape precision ausform finishing the engagement surfaces of ball and roller bearings, for enhancing the surface strength and durability of bearing inner and outer races. The method consists of induc... | 07/24/2001 |
| 6048417 | Method and apparatus for heat treating a bushing Conventional methods for heat treating cylindrical components such as track bushings involve multiple steps. For example, many such methods consist of carburizing, cooling, induction-hardening, quenching, and tempering. The conventional methods have prove... | 04/11/2000 |
| 6030471 | Method for producing a hardened wheel A specialized induction facility provides localized heating in only the desired wear areas of a crane wheel while leaving the supporting material "as-forged" and ductile. The wear area of a crane wheel is hardened such that flanges extending out from a wo... | 02/29/2000 |
| 5972135 | Stress relieved grinding rod having hard outer shell A grinding rod having a hardened outer shell of tempered martensite is adapted for use in heavy duty grinding environments. The rod is stress relieved to reduce internal compressive stresses in the tempered martensitic shell to less than 60 ksi and greate... | 10/26/1999 |
| 5935352 | Process for production of a steel component A process for production of a steel component having a hard, carbon rich dissolved surface and a tough, low carbon dissolved core, incorporating the following steps: using an alloyed steel with a carbon content of 0.3%-1.2% C and with an alloy element act... | 08/10/1999 |
| 5900081 | Computerized method for forging, quenching and tempering metal A CNC method for forging, quenching and tempering a metal material is composed of an automatic process of feeding a metal material, which is uniformly heated at a temperature of 1000° C. for about one minute by an induction coil and is subsequently forge... | 05/04/1999 |
| 5669992 | Bumper beam making process A bumper beam for vehicles is formed from cold-rolled sheet steel having an initial tensile strength of approximately 70 ksi. The steel sheet is roll formed in a desired cross-section and swept into a curvature corresponding to the vehicle requirements be... | 09/23/1997 |
| 5411612 | Method of scaleless induction heating A method and apparatus for carrying out scaleless inductive heating of ferrous parts comprising (i) using an integrated manifold-inductor quenchant device, and while gradually flowing a diluted combustible gas into the spacing between the inductor and par... | 05/02/1995 |
| 5264053 | Production method for a vehicular endless track bushing A production method for an endless track bushing wherein high-carbon low-alloy steel is selected as a bushing material, the bushing material is quench-hardened without pre-carburizing the bushing material, and then tempered. In the quench-hardening, the b... | 11/23/1993 |
| 5106431 | Process for creating high strength tubing with isotropic mechanical properties High strength alloy steel cartridge cases characterized by very high isotropic yield strength characteristics are produced from high temperature austenitic conditioned materials by subjecting the materials to a substantial one-pass draw operation and ther... | 04/21/1992 |
| 5104462 | Scanning induction hardening process by using radially moving induction coil A scanning induction hardening process in which a steel workpiece is surface hardened by progressively traversing its length with an inductor coil energized by an alternating electric current and immediately thereafter quenching the heated portion of the ... | 04/14/1992 |
| 4744836 | Method for selectively heating a workpiece subjected to low temperature thermomechanical processing Process and apparatus are provided for selective heating a portion of a workpiece to achieve improved ausforming and isoforming processes when the workpiece is plastically deformed by mechanical working above the Ms temperature. The process and... | 05/17/1988 |
| 4720311 | Camshaft lobe hardening method and apparatus A method and apparatus for making camshafts of steel by hardening the lobes after they have been rough and finish machined and the final contour and finish of the cam surface formed on each lobe while the steel is soft. Each lobe with the finished cam sur... | 01/19/1988 |
| 4715907 | Method for heat treating ferrous parts Ferrous parts are heat treated by preheating the part to an elevated temperature, inductively heating the preheated part to an austenitizing temperature followed by quenching and isothermal transformation in a media maintained at a predetermined isotherma... | 12/29/1987 |
| 4637844 | Method for heat treating ferrous parts Ferrous parts are heat treated by preheating the part to an elevated temperature, inductively heating the preheated part to an austenitizing temperature followed by quenching and isothermal transformation in a media maintained at a predetermined isotherma... | 01/20/1987 |
| 4604510 | Method and apparatus for heat treating camshafts A method and apparatus for heat treating camshafts includes a retractable shield positioned between a previously hardened surface and a surface being heat treated. During the induction heating and quenching cycle, a coolant is delivered to the hardened su... | 08/05/1986 |
| 4394194 | Method for heat treating structural members The present invention relates generally to an improved method and apparatus for induction heat treating and restraint quenching structural members of carbon steel, to a uniform martensitic structure, such that distortion of the member due to rapid quenchi... | 07/19/1983 |
| 4222799 | High-strength spring steel and its manufacturing process The present invention relates to a high-strength spring steel and its manufacturing process. More specifically, it relates to a high-strength spring steel characterized in that it is obtained by heating the surface of the material steel to over the AC | 09/16/1980 |
| 4193824 | Method for manufacturing steel spring leaves The present invention relates to a method and apparatus for manufacturing steel spring leaves. The method comprises the steps of induction heating of each steel spring leaf, its hardening by bending, cooling and, finally, tempering. Cooling its performed ... | 03/18/1980 |
| 4186037 | Thermal treatment of intermediate quenching and quick tempering through eddy currents and a device for applying said treatment to high productivity rolling plants for flat products A method of thermally treating a rolled steel plate comprising receiving the rolled steel plate after it has been rolled to a final thickness, developing a uniformed temperature distribution within the rolled steel plate greater than a critical temperatur... | 01/29/1980 |
| 4168190 | Method for locally solution-treating stainless material A method and apparatus for treating stainless steel material to reduce the carbon precipitation of the grain boundaries of the material as a result of temperature elevation due to welding, mechanical bending, or the like. The treatment includes the rapid ... | 09/18/1979 |
| 4167846 | Steel rotor with hardened fibre collecting groove and method of manufacture thereof Disclosed is a method of manufacture of a rotor for the open end spinning of staple fibres into yarn which is formed of a steel and has hardened surfaces at its fiber contacting and collecting surfaces, wherein the rotor may be fashioned by machining from... | 09/18/1979 |
| 4164435 | Method for heat treatment of link chains A method and an apparatus for heat treatment of link chains wherein the link chain is continuously introduced into a high frequency induction furnace for quenching to heat it in a manner such that the austenitizing temperature at curved portions of a link... | 08/14/1979 |
| 4142923 | Method of induction heat treating, quenching and tempering, of structural members This invention relates to a method of induction heat treating and restraint quenching structural members, particularly those of low carbon alloy steel (lean content), to a uniform martensitic structure, such that distortion of the member due to rapid quen... | 03/06/1979 |
| 4021274 | Method for heat treating by induced current Steel workpieces, such as thread-forming screws and bolts, tapping tools, and the like, are hardened in localized areas to controlled depths of hardening by utilizing loose electromagnetic coupling between the workpiece and the induction coil. The loose c... | 05/03/1977 |
| 3933534 | Continuous heat treating process for low carbon structural steels in bar form An improvement in a process for preparing a structural steel having a maximum carbon content of 0.26 weight percent, the balance comprising iron, wherein the steel is continuously heated with the use of rapid heating, followed by quenching, the improvemen... | 01/20/1976 |
| 3930907 | High strength ductile hot rolled nitrogenized steel Aging hot rolled nitrogenized low carbon steel is treated to produce a material having a level of ductility during forming and a yield strength after forming which is comparable to the 80,000 psi yield strength hot rolled low alloy (HSLA) steels. The meth... | 01/06/1976 |
