US3648995A - Apparatus for inductively heating an elongated workpiece - Google Patents

Apparatus for inductively heating an elongated workpiece Download PDF

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Publication number
US3648995A
US3648995A US884492A US3648995DA US3648995A US 3648995 A US3648995 A US 3648995A US 884492 A US884492 A US 884492A US 3648995D A US3648995D A US 3648995DA US 3648995 A US3648995 A US 3648995A
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workpiece
quenching
heating
inductor
generally
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US884492A
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English (en)
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Richard F Seyfried
Norbert R Balzer
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Park Ohio Holdings Inc
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Park Ohio Industries Inc
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching

Definitions

  • the invention relates to the art of induction heating and more particularly to an apparatus for inductively heating an elongated workpiece preparatory to quench hardening.
  • This invention is particularly applicable for inductively heating and then quench hardening axle shafts having a flange at one end, and it will be described with particular reference thereto; however, it should be appreciated that the invention has much broader applications and may be used for other elongated workpieces, such as axle shafts without flanges.
  • the heating cycle is determined by the length of time necessary for the inductor and quench body to progress the total length of the portion of the axle shaft being hardened. This can be a substantial time according to the length of the axle shaft and the rate at which the inductor is moved.
  • the present invention is directed toward an apparatus for heating and quench hardening an elongated workpiece, such as an axle shaft, which overcomes the disadvantages experienced when employing the previous, most common axle shaft hardening apparatus by substantially increasing the production rate of the apparatus.
  • an apparatus for inductively heating and quench hardening an elongated workpiece having spaced ends and an elongated generally cylindrical body with a longitudinally extending axis comprises conveyor means for conveying the workpiece along a path generally transverse to the axis; means for stopping movement of the workpiece when it reaches a selected position in the path and heating means at this selected position for inductively heating the cylindrical body.
  • This heating means comprises an inductor having a single turn conductor with two generally parallel side legs extending generally parallel to the axis and spaced slightly from the elongated body when the workpiece is at the selected position and end legs electrically connecting the side legs. The side legs extend generally the complete length of the cylindrical body to be heated.
  • the inductor has a first heating position with the side legs closely adjacent the body and extending into the path of movement of the workpiece and a second retracted position with the side legs spaced from the path of movement of the workpiece; means for shifting the inductor into the retracted position as the conveyor means causes the workpiece to approach and depart from the selected position; means for shifting the inductor into the heating position when the workpiece is located in the selected position by the stopping means; and, means for quenching the workpiece after it is inductively heated by the heating means.
  • the heating and quenching apparatus By constructing the heating and quenching apparatus in the above-defined manner, the heating and quenching can be accomplished on a conveyor means wherein the loading and unloading takes place at the same time as the heating and quenching operations. In this manner, a succession of workpieces, such as axle shafts, can be heated and quench hardened without necessitating a time delay for loading and unloading workpieces from the apparatus.
  • the primary object of the present invention is the provision of an apparatus for inductively heating and quench hardening a succession of elongated workpieces, which apparatus reduces the total cycle time for each workpiece.
  • Another object of the present invention is the provision of an apparatus for inductively heating and quench hardening a succession of elongated workpieces, which apparatus uses a single turn inductor extending the length of the workpiece and shiftable from the workpiece, as the workpiece is moved to and from the inductor along a given path of movement.
  • Yet another object of the present invention is the provision of an apparatus for inductively heating and quench hardening a succession of elongated workpieces, which apparatus has a production rate dependent upon only the longest of successive operations, instead of the total of the time for these successive operations.
  • Still a further object of the present invention is the provision of an apparatus for inductively heating and quench hardening a succession of elongated workpieces, which apparatus moves the workpieces in a path from a loading position, to a heating position, to a quenching position, and then to an unloading position on a single mechanism without releasing the workpieces therefrom.
  • FIG. 1 is a top view illustrating, somewhat schematically, the preferred embodiment of the present invention
  • FIG. 2 is an enlarged cross-sectional view taken generally along line 2-2 of FIG. 1;
  • FIG. 3 is a cross-sectional view illustrating the clamping device utilized in connection with the preferred embodiment of the present invention
  • FIG. 4 is an enlarged partial view showing, schematically, the workpiece and inductor contemplated by the present invention.
  • FIG. 5 is an enlarged cross-sectional view taken generally along line 5-5 of FIG. 4;
  • FIG. 6 is an enlarged partial view illustrating, schematically, another aspect of the preferred embodiment of the present invention.
  • FIG. 7 is an enlarged partial cross-sectional view illustrating, schematically, still another feature of the preferred embodiment of the present invention.
  • FIG. 8 is an enlarged partial view illustrating, schematically, a slight modification of the structure illustrated in FIG. 4;
  • FIGS. 9-11 are schematic views showing other embodiments of the present invention.
  • FIGS. I and 2 show an induction heating and quench hardening apparatus A for hardening the outer cylindrical surface of a workpiece, illustrated as a flanged axle shaft B.
  • a conveying and workpiece engaging mechanism in the form of a turret It, for moving successive workpieces B between circumferentially spaced positions, identified as I, II, III, and IV in FIG. 2.
  • turret It a conveying and workpiece engaging mechanism
  • a loading device 12 for loading a workpiece B onto the turret 10.
  • this workpiece is advanced to position II where there is provided an induction heating device I4 which forms an essential aspect of the present invention and will be described in detail later.
  • Turret 10 then moves the workpiece B to position III where there is provided a quenching device I6 which forms another aspect of the present invention and will be described in more detail later.
  • the turret I0 is again indexed, the workpiece B is moved to position IV where there is provided an unloading device 18 and an auxiliary quenching device 20.
  • a quench tank 22 receives the workpieces from the unloading device and an inclined conveyor 24 in this tank removes the workpieces from the apparatus A.
  • the workpiece B takes the form as shown in FIG. 4 and includes spaced ends 30, 32 connected by a generally cylindrical body 34. At end 30 there is a commonly used splined portion 36, and at end 32 there is a somewhat commonly used flanged 38. It is appreciated that this workpiece may take a variety of forms other than the illustrated form shown in FIG. 4.
  • a workpiece B is loaded onto turret I at position I by the loading device I2. Thereafter, the turret is indexed to bring the workpiece into position I] where it is inductively heated, while being rotated in a manner to be described. At the same time, another workpiece is being loaded onto the turret 10 by device I2. Turret I0 is again indexed, approximately 90, which brings the first-mentioned workpiece B into position III wherein the quenching device I6 quench hardens the heated workpiece to provide the proper hardness on the surface of the workpiece. At this time, another workpiece B is loaded onto the turret III at position I.
  • turret 10 is again indexed, approximately 90, and the first-mentioned workpiece is moved to the position IV.
  • auxiliary quenching device further quenches the surface of the workpiece.
  • the unloading device 18 removes the workpiece from the turret and moves it into the quench tank 22 for reducing the temperature of the workpiece.
  • the unloading device I8 places the workpiece B onto the inclined conveyor 24 where it is conveyed from the tank 22 to an appropriate repository.
  • another workpiece B is loaded onto the turret 10 by the device I2.
  • a workpiece is loaded and unloaded from the turret.
  • the conveying and workpiece engaging mechanism 10 which is basically in the form of a turret, includes central drive shaft 41 having an enlarged center portion and rotatably mounted in spaced journal blocks 42, 44.
  • an indexing mechanism 45 which may take a variety of structural forms; however, in accordance with the illustrated embodiment of the present invention, this indexing means includes a motor 46 connected to a gear box, clutch and brake mechanism 48 by a chain 50.
  • Hydraulic coupling 52 provides a swivel connection for introducing the necessary hydraulic lines into the mechanism 48 for causing the mechanism to index, as previously described, by engaging clutches and brakes or similar devices within the mechanism.
  • the details of mechanism 48 may take a variety of forms and for simplicity these well known devices have been omitted.
  • Forming the remaining basic structural elements of the turret 10 are spaced apart circular support plates 60, 62. Onto these support plates there are attached four equally spaced workpiece engaging mechanisms, each including a tailstock 70 and a flange clamp 72. Since all of these mechanisms are substantially identical in structure and function, only one will be described in detail, and this description will apply equally to the other tailstoclts and flange clamps.
  • This bracket carries a cam plate 96 which coacts with spaced electrical switches I00, 102 for limiting the forward and reverse movement of the center 84 and the spring loaded center 88.
  • the position of the switches may be adjusted to compensate for various sized workpieces.
  • the electrical control circuit into which these switches are incorporated has been omitted for simplicity, since it is not necessary to describe the preferred embodiment of the present invention.
  • the flange clamp 72 employs a mounting plate IIO and a housing I12 secured onto support plate 62 by circumferentially spaced bolts I14.
  • a motor mounting plate [I6 At the outboard end of housing 112 there is provided a motor mounting plate [I6 for a purpose to be hereinafter described.
  • Axially spaced bearings I20, I22 are provided within the housing I12 for rotatably securing a hollow shaft I24 onto which is connected a driven gear by a gear nut 132.
  • the illustrated embodiment of the present invention includes a clamp control mechanism I54 including a hollow shaft I60 extending toward the housing 150, a piston 162, a release cavity I64, a clamping spring I66 and a hydraulic inlet 168.
  • a clamp control mechanism I54 including a hollow shaft I60 extending toward the housing 150, a piston 162, a release cavity I64, a clamping spring I66 and a hydraulic inlet 168.
  • a clamp actuating spider secured onto the extreme end of hollow shaft 160.
  • a plurality of circumferentially spaced arms I72 form the actual clamping element of the flange clamp. Referring more particularly to these arms, as illustrated in the preferred embodiment, they each incorporate a clamping finger 174, a fixed pivot pin 176, a slot 178 and a spider sliding pin 1%.
  • a spring loaded center 192 having sliding bearings I94, I96 and a loading spring I98.
  • the center 192 is biased outward to provide the centering function during the clamping of the flange onto the ring 190.
  • a shift lever 200 pivotally mounted onto a mounting plate 202 surrounding shaft 41.
  • a cylinder 204 secured onto bracket 206 may be actuated to pivot the lever 200 away from plate 62 which, in turn, moves collar 152 to the right, as shown in FIG. 3, for retracting the clamp hous ing 150.
  • the workpiece may be loaded transversely into the turret in a manner to be described later.
  • a switch rod 210 is connected onto the lever 200 to move a switch operator 212 between spaced control switches 214, 216. These switches limit the movement of the lever, and thus the housing 150 by an appropriate electrical circuit, not illustrated.
  • the above description of the flange clamp '72 contains a description of its operation. To summarize this operation, initially the lever 200 is shifted clockwise, as viewed in FIG. 3, which retracts the housing 150. Also, fluid is introduced into cavity 164 which opens the arms 172. Thereafter a workpiece B is located in front of the flange clamp, and a lever 200 is moved counterclockwise. This engages the spring loaded center 192 against the center in the end of the workpiece to locate the workpiece. Thereafter, hydraulic pressure is released from cavity 164 so that spring 166 drives the arms 172 into clamping engagement with flange 38. This clamps the flange 38 against ring 190.
  • rods are also rotatably mounted in blocks 244, 246 so that they cannot move axially. Ends 250 of these rods are adapted for receiving a wrench so that these rods may be rotated to adjust the position of each element 230, 232 on bar 224. In this manner, workpieces of different lengths can be accommodated in this loading device.
  • a cylinder 260 having a reciprocating rod 262 pivots a crank 264 secured onto bar 224.
  • the workpiece is then moved from the phantom line position to the solid line position in FIG. 2.
  • a workpiece is manually placed upon the cradles after the workpiece receiving centers have been retracted and moved into the loading position. Thereafter, the tailstock and flange clamp at position I are actuated to grip the workpiece for subsequent movement by the turret 10.
  • other arrangements could be utilized for loading the workpiece into the position I of the turret 10.
  • INDUCTION HEATING DEVICE Induction heating device 14 includes a single tum inductor 280 for heating the complete length of the workpiece B.
  • This inductor includes parallel side legs 282, 284 connected by cross legs 286, 288, at the respective ends.
  • spaced leads 290, 292 which may be tapped into leg 284 at any position along its length.
  • An appropriate supply of high frequency electrical current is used which supply may take a variety of forms, schematically illustrated as generator 294.
  • This power supply is located within a case 296 supported upon a movable plate 300. Below the movable plate is a stationary or fixed plate 302 on which the movable plate may rest when it is lowered.
  • guide pins 304 To guide the vertical movement of case 296 there is provided guide pins 304, only one of which is shown, joumaled within bushing 306.
  • a lower cylinder 308 having a ram 310 is connected onto the movable plate 300 by a clevice 312 and a depending arm 314. As illustrated in FIG. 5, the legs 282, 284 are spaced around the circumference of the workpiece B an angular distance of approximately I20". In this manner, less upward movement is necessary for the inductor by the ram 310 when the workpiece is being moved into and away from the position II.
  • legs 282, 284 are appropriately contoured to provide optimum magnetic coupling between the workpiece and the conductors.
  • U-shaped larninations 320 are positioned over the end leg 288 for directing and concentrating the flux field adjacent the fillet between the cylindrical portion 46 of the workpiece and the flange 38 of the workpiece.
  • Other appropriate changes could be made in the inductor without departing from the intended scope of this invention. For instance, further contouring of the legs 282, 284 could be used and iron laminations could be employed throughout the total length of the conductors forming the inductor to control and direct the flux field being used to heat the outer surface of the workpiece B.
  • the quenching device 16 at position III includes an elongated generally arcuately shaped quench body 330 having an internal quench liquid passage 332, a quenching liquid inlet 334 and quenching fluid outlets or apertures 336 on an elongated arcuate surface.
  • the quench body 330 is secured onto a sup port 340 secured to sliding pins 342, only one of which is shown. These pins are received in bushings 344 mounted upon frame 345.
  • a cylinder 346 actuates a ram 348 to reciprocate the support 340 for moving the quench body into and out of its quenching position.
  • cylinder 346 shifts the quench body 330 into the phantom line position shown in FIG. 2.
  • cylinder 346 is again actuated to lift the quench body 330 into the solid line position shown in FIG. 2.
  • quenching liquid is directed from the apertures onto the cylindrical body portion 34 of workpiece B.
  • motor 136 is actuated to rotate the workpiece for uniform quenching of the previously inductively heated outer surface.
  • the quenching liquid flow is stopped and cylinder 346 shifts the quench body 330 into its retracted position so that the workpiece can be indexed from position III to position IV.
  • the arms 350, 352 are pivoted upwardly to receive the workpiece in cradles 353.
  • appropriate controls are actuated for lifting arms 172 out of contact with flange 38, shifting the tailstock 70 away from the workpiece, and shifting the flange clamp 72 away from the workpiece. This leaves the workpiece supported by the arms 350, 352. Thereafter, the arms are pivoted downwardly to deposit the workpiece onto conveyor 24 for removal. Details of the conveyor will be described later.
  • auxiliary quenching device 20 will be provided at position IV.
  • This quenching device includes an arcuate quench body 370 extending over approximately 90 of the workpiece B. It is on the opposite side of position IV from the workpiece B so that it does not form interference with this workpiece as it is being indexed into position IV. Consequently, the auxiliary quenching device may be fixed on a bracket 37].
  • Within the quench body 370 there is provided internal quench liquid passage 372 and a quench liquid inlet 374.
  • auxiliary quenching In the arcuate shaped surface facing the workpiece B there are provided a number of apertures 376 through which the quench liquid is passed onto the surface of the workpiece B.
  • This provides an auxiliary, or subsequent, quenching to augment the quenching effected at III.
  • auxiliary quenching workpiece B is not unloaded from the turret when the workpiece first moves into position IV. Also, the workpiece is rotated in this position during the quenching operation to provide a uniform auxiliary quench. It is anticipated that this auxiliary quench need not be used if the main quench at position I" is sufficient for proper quench hardening of the workpiece.
  • the inclined conveyor 24 mounted in tank 22 is positioned below the arms 350, 352 and includes, in the illustrated embodiment, spaced sprockets 380, 382 connected by a continuous chain 384.
  • workpiece receiving brackets 386 are spaced along the chain to receive and remove workpieces from the arms 350, 352 when they are pivoted into the solid line position shown in FIG. 2.
  • the motor 390 drives a chain 392 which, in turn, actuates a gear box 394 for rotating the sprockets 382.
  • the high frequency current used in the heating cycle is 3,000 cycles per second.
  • the heating time for a one inch diameter axle shaft is approximately yl2 seconds.
  • Quenching time is approximately 25 seconds, about l2-l3 seconds at position III and about the same at position IV.
  • Auxiliary quenching device 20 is continuous; therefore, quenching is effected as soon as the workpiece approaches position IV. This increases the quench time at position IV. Consequently, the quenching time is controlling on the operating rate.
  • the processing cycle in this instance, would be approximately l3 seconds, plus indexing time of about three seconds.
  • the auxiliary quenching device, in this example is utilized for approximately 12-13 seconds or about the same time as the heating cycle. This is a substantial improvement over the cycle time required for axle shaft hardening machines now commonly used.
  • leg 284 of inductor 280 can be tapped at various positions. This is illustrated in FIG. 8 wherein inductor 400 has parallel legs 402, 404 and connecting legs 406, 408. This inductor is used to heat a workpiece 410 having no end flange. Leg 402 is tapped at one end by two input leads 412, 414 connected across a power source M6.
  • the preferred embodiment of the present invention involves the use of four separate positions for turret 10. However, various other combinations of turret positions can be employed.
  • turret 10' has three positions, i.e., I [1,, and III At position I, a workpiece B is loaded onto the turret. At position II an inductor 420 is moved into the heating position, and the workpiece B is inductively heated. A quench unit 422 is shifted into the illustrated location in position III, for quenching the workpiece. At this same position, the workpiece is unloaded from turret I0.
  • FIG. 10 shows still another embodiment of the invention wherein five positions (1,, II,, III,,, IV, and V are employed.
  • workpiece H" is loaded onto turret 10" at position I
  • the workpiece is heated by an inductor 430 shifted into heating relationship with the workpiece.
  • Positions Ill, and IV are used to quench the workpiece by quench units 432, 434, respectively.
  • An auxiliary quenching device 436 further quenches the workpiece at position V before the workpiece is unloaded at this same position.
  • turret 10" employs six separate positions, l vl At position I workpiece B' is loaded onto the turret. The workpiece is then preheated in position Il by a shiftable inductor 440 and finally heated by shiftable inductor 442 at position III Quenching devices 444, 446 are shifted into quenching relationship with the workpiece at positions W and V for quenching the workpiece. At position VI the workpiece is unloaded.
  • An apparatus for inductively heating and quench hardening an elongated workpiece having spaced ends and an elongated generally cylindrical body with a longitudinally extending axis comprising: a rotary indexing means for moving a workpiece successively in a generally circular path transverse to said axis from a first position, to a second position, to a third position, to a fourth position; loading means at said first position for loading a workpiece onto said indexing means; heating means at said second position for inductively heating said cylindrical body, said heating means comprising an inductor having a single turn conductor with two generally parallel side legs extending generally parallel to said axis and spaced slightly from said elongated body when said inductor is in a heating position and end legs electrically connecting said side legs and extending arcuately around said body, said side legs extending generally the complete length of said cylindrical body, means for rotating said workpiece about said axis, and means for creating a high frequency current to flow through said conductor to heat said body; que
  • An apparatus as defined in claim 1 including a second quenching means at said fourth position for further quenching of said cylindrical body.
  • An apparatus for inductively heating and quench hardening an elongated workpiece having spaced ends and an elongated generally cylindrical body with a longitudinally extending axis comprising: conveyor means for conveying said workpiece along a path generally transverse to said axis; means for stopping movement of said workpiece when it reaches a selected position in said path; heating means at said selected position for inductively heating said cylindrical body, said heating means comprising an inductor having a single turn conductor with two generally parallel side legs extending generally parallel to said axis and spaced slightly from said elongated body when said workpiece is at said selected position and end legs electrically connecting said side legs, said side legs extending generally the complete length of said cylindrical body, means for rotating said workpiece about said axis while at said selected position, and means for creating a high frequency current to flow through said conductor to heat said body; said inductor having a first fixed heating position with said side legs closely adjacent said body and extending into the path of movement of said workpiece and a second re
  • An apparatus for inductively heating and quench hardening an elongated workpiece having spaced ends and an elongated generally cylindrical body with a longitudinal axis comprising conveying means for conveying a succession of said workpieces between first, second, third and fourth positions along a path generally transverse to the axis of said workpieces, means at said first position for loading workpieces onto said conveyor means; means at said second position for inductively heating the cylindrical bodies of said workpieces, said heating means including a single turn inductor with a generally arcuate side profile, means for locating said side profile adjacent said cylindrical bodies of said work pieces and spaced therefrom, said inductor having a length generally corresponding to the length of said cylindrical bodies and means for rotating said workpieces at said second position, means at said third position for quenching said heated cylindrical bodies, said quenching means including means for directing a quenching liquid against said bodies and means for rotating said workpieces at said third position; second means at said fourth position for quenching said heated cylindrical bodies,

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • General Induction Heating (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
US884492A 1969-12-12 1969-12-12 Apparatus for inductively heating an elongated workpiece Expired - Lifetime US3648995A (en)

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JP (1) JPS5029409B1 (de)
CA (1) CA932143A (de)
DE (1) DE2057005C3 (de)
FR (1) FR2073189A5 (de)
GB (1) GB1311026A (de)
SE (1) SE384036B (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3737610A (en) * 1970-03-05 1973-06-05 Park Ohio Industries Inc Apparatus for inductively heating and quench hardening an elongated workpiece
US3738636A (en) * 1970-05-23 1973-06-12 Aeg Elotherm Gmbh Apparatus for gripping and holding elongated workpieces particularly in induction hardening machines
US3988179A (en) * 1975-01-09 1976-10-26 Park-Ohio Industries, Inc. Method and apparatus for inductively heating elongated workpieces
US4135704A (en) * 1972-11-21 1979-01-23 Prolizenz Ag. Method and apparatus for heat treatment of material to be worked on, especially of aluminum alloys or magnesium alloys
FR2636971A1 (fr) * 1988-09-26 1990-03-30 Aeg Elotherm Gmbh Installation de trempe par induction
US20040031787A1 (en) * 2002-06-28 2004-02-19 Forward Technology A Crest Group Company Method and apparatus for induction hardening
US20080244892A1 (en) * 2004-05-19 2008-10-09 Valeo Equipements Electriques Moteur Method For Producing a Shaft Pertaining to a Starter
US11673378B2 (en) 2020-11-23 2023-06-13 Henry G. Schirmer Crystal clear high barrier thermoformed plastic bottle
US11673309B2 (en) 2020-11-23 2023-06-13 Henry G. Schirmer Crystal clear high barrier packaging film
US11673377B2 (en) 2020-11-23 2023-06-13 Henry G. Schirmer Crystal clear high barrier packaging film

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011105752B4 (de) * 2011-06-03 2012-12-13 Itg Induktionsanlagen Gmbh Vorrichtung zum Halten eines Werkstücks während einer induktiven Erwärmung
EP2957530A1 (de) * 2014-06-17 2015-12-23 Saet S.p.A. Vorrichtung zum Induktionserwärmen von mechanischen Komponenten
DE102017011048B4 (de) * 2017-11-29 2019-07-04 Efd Induction Gmbh Vorrichtung und induktives Härteverfahren zum induktiven Härten von metallischen Werkstücken sowie Verwendung der Vorrichtung

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US2190931A (en) * 1939-01-09 1940-02-20 Campbell Wyant & Cannon Co Camshaft treating machine
US2293534A (en) * 1935-12-14 1942-08-18 Ohio Crankshaft Co Apparatus for hardening shafts and the like
US2343889A (en) * 1938-10-15 1944-03-14 Ohio Crankshaft Co Apparatus for electric heating
US2419619A (en) * 1943-02-13 1947-04-29 Ohio Crankshaft Co Method of heat-treating flanges and the like
US2676242A (en) * 1947-03-25 1954-04-20 Hartford Nat Bank & Trust Co Device for treating workpieces through inductive heating in a high-frequency magnetic field
US2787566A (en) * 1951-10-17 1957-04-02 Deutsche Edelstahlwerke Ag Process and apparatus for the inductive surface hardening of cylindrical workpieces
US3240480A (en) * 1962-12-26 1966-03-15 Int Harvester Co Heat treating apparatus for crankshafts
US3494604A (en) * 1966-03-08 1970-02-10 Aeg Elotherm Gmbh Apparatus for inductively heating parts of cylindrical workpieces

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2293534A (en) * 1935-12-14 1942-08-18 Ohio Crankshaft Co Apparatus for hardening shafts and the like
US2343889A (en) * 1938-10-15 1944-03-14 Ohio Crankshaft Co Apparatus for electric heating
US2190931A (en) * 1939-01-09 1940-02-20 Campbell Wyant & Cannon Co Camshaft treating machine
US2419619A (en) * 1943-02-13 1947-04-29 Ohio Crankshaft Co Method of heat-treating flanges and the like
US2676242A (en) * 1947-03-25 1954-04-20 Hartford Nat Bank & Trust Co Device for treating workpieces through inductive heating in a high-frequency magnetic field
US2787566A (en) * 1951-10-17 1957-04-02 Deutsche Edelstahlwerke Ag Process and apparatus for the inductive surface hardening of cylindrical workpieces
US3240480A (en) * 1962-12-26 1966-03-15 Int Harvester Co Heat treating apparatus for crankshafts
US3494604A (en) * 1966-03-08 1970-02-10 Aeg Elotherm Gmbh Apparatus for inductively heating parts of cylindrical workpieces

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3737610A (en) * 1970-03-05 1973-06-05 Park Ohio Industries Inc Apparatus for inductively heating and quench hardening an elongated workpiece
US3738636A (en) * 1970-05-23 1973-06-12 Aeg Elotherm Gmbh Apparatus for gripping and holding elongated workpieces particularly in induction hardening machines
US4135704A (en) * 1972-11-21 1979-01-23 Prolizenz Ag. Method and apparatus for heat treatment of material to be worked on, especially of aluminum alloys or magnesium alloys
US3988179A (en) * 1975-01-09 1976-10-26 Park-Ohio Industries, Inc. Method and apparatus for inductively heating elongated workpieces
FR2636971A1 (fr) * 1988-09-26 1990-03-30 Aeg Elotherm Gmbh Installation de trempe par induction
US20040031787A1 (en) * 2002-06-28 2004-02-19 Forward Technology A Crest Group Company Method and apparatus for induction hardening
US6903316B2 (en) * 2002-06-28 2005-06-07 Forward Technology Method and apparatus for induction hardening
US20080244892A1 (en) * 2004-05-19 2008-10-09 Valeo Equipements Electriques Moteur Method For Producing a Shaft Pertaining to a Starter
US11673378B2 (en) 2020-11-23 2023-06-13 Henry G. Schirmer Crystal clear high barrier thermoformed plastic bottle
US11673309B2 (en) 2020-11-23 2023-06-13 Henry G. Schirmer Crystal clear high barrier packaging film
US11673377B2 (en) 2020-11-23 2023-06-13 Henry G. Schirmer Crystal clear high barrier packaging film

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Publication number Publication date
DE2057005C3 (de) 1975-09-04
FR2073189A5 (fr) 1971-09-24
GB1311026A (en) 1973-03-21
DE2057005B2 (de) 1972-11-30
JPS5029409B1 (de) 1975-09-23
DE2057005A1 (de) 1971-07-22
SE384036B (sv) 1976-04-12
CA932143A (en) 1973-08-21

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