US3650143A - Apparatus for forging crankshafts and the like - Google Patents

Apparatus for forging crankshafts and the like Download PDF

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Publication number
US3650143A
US3650143A US841272A US3650143DA US3650143A US 3650143 A US3650143 A US 3650143A US 841272 A US841272 A US 841272A US 3650143D A US3650143D A US 3650143DA US 3650143 A US3650143 A US 3650143A
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United States
Prior art keywords
die
forging
crankpin
upsetting
cross member
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Expired - Lifetime
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US841272A
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English (en)
Inventor
Gabriel Ruget
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Compagnie des Ateliers et Forges de la Loire SA
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Compagnie des Ateliers et Forges de la Loire SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/06—Making machine elements axles or shafts
    • B21K1/08—Making machine elements axles or shafts crankshafts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/17—Crankshaft making apparatus

Definitions

  • the pressure [58] Field of Search ..29/6; 72/412, 471, 472 developed in said ram is adjustable by means of a discharge valve set according to the dimensions of the workpiece to be [5 1 Rflefences Cited forged, said valve permitting of performing the forging operation in two, steps, i.e., firstly upsetting the metal while off- UNITED STATES PATENTS setting the crankpin, then forging the crankshaft webs at the 2,827,685 3/1958 Cleghorn ..29/6 end of the upsetting step. 2,790,227 4/1957 Fine "29/6 3 Claims, 13 Drawing Figures mammal 1972 3,650,143
  • this result is obtained by using an apparatus of the type shown diagrammatically in FIG. I of the attached drawing, this apparatus comprising essentially a lower bed plate 1 supported by the fixed cross member 2 of a conventional forging press;
  • the initial blank comprises as a rule enlargements or swellings separated by constrictions.
  • the enlargements generally are to constitute the webs or flanges of the forged crankshaft, i.e., the portions of which the shape is altered, and the constrictions are to constitute the necks of the forging, whether eccentric or not.
  • the upper cross member 5 When following the press action the upper cross member 5 is lowered it causes via the inclined slideways 7, 7' the cradles 3 and 3' to move towards each other. This movement induces the upsetting of the metal on each side of the intermediate portion between the two end dies closed by the pressure of rams 9 and 9 enclosed in the upper cross member 5.
  • FIG. 1 there is shown in dash and dot lines, between the two cradles 3 and 3', the lower crankpin die 11 and the upper crankpin die 10, a throw formed at the end of the forging operation.
  • crankshafts from plain bars, i.e., without alternate swellings and constrictions, by using the arrangement described and illustrated in the British Pat. No. 628,519.
  • the cross member 5 engages firstly the cradles 3 and 3 via slideways 7 and 7, thus producing a first upsetting of the blank metal; then this cross member 5 moves downward the upper crankpin die and the actual forging operation as described hereinabove begins at that time.
  • This preliminary upsetting permits, from an initial plain bar, of disposing of a quantity of metal sufficient for giving to each web the necessary volume and this arrangement is particularly advantageous in the forging of crankshafts having relatively large webs in proportion to the journal diameter.
  • crankshafts To reduce the total cost of crankshafts while increasing the efficiency of these forming apparatus, reduced and regular machining allowances must be obtained in the resulting blank. Under these conditions, the metal flow must be reduced by causing upper and lower crankpin dies and cradles to form together, at the end of the forging stroke, a closed volume similar to a die which the metal is forced to fill up. This improvement makes known apparatuses capable of utilizing these dies by exploiting more completely the tonnage of the press.
  • the metal flows freely and the upsetting force is proportional to the surface area of the meridian plane of the web and also to the creep strength of the metal.
  • This creep strength increases as the e/D ratio decreases. Therefore, two causes act simultaneously to increase the upsetting force at the end of the stroke.
  • the upsetting force to be used when forging metal is about six time that necessary when the metal is allowed to flow freely, and increases very considerably during the last portion of the stroke.
  • This first object is obtained by eliminating the hitherto customary rigid coupling between the movable cross member and the upper crankpin die so that the synchronization between the offsetting and upsetting movements ceases when the offsetting movement is ended but a short upsetting stroke is still available.
  • This invention is characterized in that the upper crankpin die is rendered independent of the upper cross member by mounting said upper crankpin die on a piston movable in relation to said cross member, said piston being controlled by a hydraulic ram having the pressure in its cylinder regulated by a discharge valve preset as a function ofthe dimensions of the piece to be forged, said valve permitting of performing the forging operation in two phases: firstly, upsetting the metal while offsetting the crankpin, then forging the webs during a last upsetting phase.
  • the pressure in said hydraulic cylinder is adjustable by means of a pair of discharge valves to permit in succession a preliminary upsetting, continuing this upsetting in conjunction with the crankpin offsetting,,and finally forging the web during a last upsetting phase.
  • FIG. 4 illustrates the forging apparatus in longitudinal vertiby inclined slideways formed on the upper cross member of.
  • dies disposed: either on the lower and upper lateral holding blocks or die holders; either on the upper and lower crankpin dies;
  • crankpin die or on the lower crankpin die and on the upper lateral holding blocks or die holders.
  • FIG. 1 is a schematic view illustrating a forging apparatus as used in the prior art.
  • F IG. 2 is a schematic view illustrating a metal blank where the metal flows freely.”
  • FIG. 3 is a similar view showing how the metal flow is limited by the configuration given to the upper crankpin die and the lower crankpin die.
  • the upper crankpin die carried by the upper cross member is rigid with a piston movable in relation to said cross member in the cylinder provided in said cross member, whereby the off setting movement is completed when a short final upsetting stroke is still available;
  • impressions are formed in said upper crankpin die and on the lower crankpin die constituting, with the forging faces of the lateral holding blocks or die holders, the web dies.
  • the same parts are designated by the same reference numerals as in FIG. 1;
  • FIG. 5 is a detail sectional view showing a die member arrangement
  • FIG. 6 is an elevational view showing a crankshaft obtainable by using the die members illustrated in FIG. 5;
  • FIGS. 7 and 8 are detail sectional views showing two other die member arrangements
  • FIG. 9 is a diagram showing the action exerted by an inclined slideway of the upper cross member on an inclined slideway of the corresponding cradle;
  • FIGS. 10 and 11 are longitudinal sectional views showing the forging machine incorporating features already illustrated in FIG. 4 as well as other features to be described hereinafter.
  • FIG. 12 is a diagram illustrating the hydraulic circuit according to the feature of this invention whereby the pressure developing inthe upper crankpin die ram is adjusted by a calibrated discharge valve;
  • FIG. 13 is a hydraulic circuit diagram according to the modified form of embodiment whereby the pressure in the ram is adjusted by means of two differently calibrated valves.
  • the cradles 3 and 3 carry holding blocks 14 and l5, l6 and 17 adapted to hold the blank in position during the forging operation.
  • the faces of these holding blocks which register with the forging zone are flat and the upper crankpin die 10 and the lower crankpin die 11 have formed therein the impressions 20 and 22, 19 and 21.
  • the holding blocks are stopped by against the fiat side faces of theupper and lower crankpin dies so that on either side of these two members a pair of closed dies are formed for shaping the blank metal to the desired configuration.
  • the dies may be hollowed out of the lateral'holding blocks.
  • dies 31 and 33 are formed in the lateral blocks 15 and 17 for the pair of upper impressions
  • other dies 30 and 32 are formed in the lateral blocks 14 and 16 for the pair of lower impressions.
  • FIG. 7 illustrates impressions 20 and 22 formed in the upper crankpin die 10, and other impressions 30 and 32 formed in the lower lateral blocks 14 and 16, respectively;
  • FIG. 8 shows impressions l9 and 21 formed in the lower crankpin die 11, and other impressions 31 and 33 formed in the upper lateral holding blocks 15 and 17, respectively.
  • crankshaft webs According to the geometrical arrangement of the crankshaft webs, and also the length and diameter of the crankpins and journals, one or the other of these solutions may be adopted.
  • the upper crankpin die 10 is carried by a piston 13a slidably mounted in the cylinder 13 of a hydraulic ram.
  • the latter may be supplied with fluid under pressure when the cross member 5 is in its uppermost position, and when this member 5 moves downwards the cylinder may be connected to a fluid reservoir (not shown) via a valve adjusted to open under a predetermined pressure adjustable however as a function of the dimensions of the crankshaft to be forged.
  • FIG. 12 The diagram of the hydraulic device connected to the ram 13 is illustrated in FIG. 12.
  • This device comprises a calibrated discharge valve 70 connected to the ram 13, and a distributor 71 receiving the pressure fluid, the return taking place to the reservoir 72.
  • the lower crankpin die 11 is carried by a piston 12a movable in a cylinder 12 of a hydraulic ram supplied with fluid under pressure when the movable cross member is in its uppermost position, just before the forging operation begins, said cylinder being connected to the reservoir via an adjustable valve when the cross member 5 is moving downwards.
  • the blank 8 of which the portion to be shaped into a throw has just been heated to the proper forging temperature, is laid with the proper orientation upon the holding blocks 14 and 16 integral with the cradles 3 and 3
  • the lower assembly of the apparatus should be shifted laterally so that it lies outside the press during the handling operation.
  • This operation comprises two steps: firstly lowering the blank with a crane by a vertical movement of translation upon the holding blocks, then introducing this complete lower assembly into the press by a movement of translation parallel to the blank axis and under the control of the sliding table normally equipping the forging press.
  • the upper crosshead 6 When the press is actuated, the upper crosshead 6 is lowered as well as the upper cross member 5, whereby its inclined slideways 7 and 7' engage the registering slideways formed on the sliding cradles. At the same time the upper tool members engage the lower tool members, thus causing each one of the two blank portions clamped between the blocks 14 and 15 or 16 and 17 to become integral with the sliding cradle 3 or 3' in which it lies. As the cross member 5 continues its downward stroke, the forging operation proper begins.
  • the press ram 6 is raised and carries along the cross member 5 and the upper tool members, and when these members have reached their uppermost level, the lower assembly of the forging apparatus can be removed from the working table or bed of the press.
  • the blank is subsequently removed from the holding blocks, and the sliding cradles 3 and 3' are restored to their initial position; then the rams 13 and 12 are supplied with pressure fluid to similarly restore the upper and lower crankpin dies to their initial positions, and a new cycle can be resumed by introducing a fresh blank with a vertical movement of translation.
  • this blank may be introduced into the apparatus without removing the lower portion of this apparatus from under the press crosshead; in this case a vertical movement of translation directed at right angles to the blank axis must be combined with a successive horizontal movement of translation parallel to this axis. Thus, time can be saved for forging throws at the ends of the bars.
  • a modified form of embodiment consists in communicating the cylinder 13 with the reservoir via two discharge valves.
  • FIG. 13 The diagram of the hydraulic device according to this modified form of embodiment is illustrated in FIG. 13. It comprises a high-pressure calibrated discharge valve 73 and a lowpressure calibrated discharge valve 74, and a pair of distributors 75, 76.
  • the first valve is directed to exert a vertical downward force upon the upper crankpin die 10, this force being veryslight ly inferior to Fr (the crankpin clamping force).
  • This first valve is closed by the downward movement of the upper cross member and under these conditions the ram 13 can be discharged through the other valve setting a pressure value corresponding to the force F2.
  • the crank forging process takes place in three successive steps. During the first step the upper crankpin die cannot overcome the lower crankpin die force and the metal is simply upset until the first discharge valve is closed; the second and third steps follow as described hereinabove.
  • Another arrangement according to this invention affording a better utilization of the press tonnage, whether this arrangement is used separately or in combination with the preceding one, consists in eliminating the hydraulic ram 9 provided for clamping the lateral holding blocks 14 and 15, and also the hydraulic ram 9' for clamping the lateral holding blocks 16 and 17 illustrated in FIG. 4.
  • the inclined slideways 7 and 7' engage, during their downward movement, the registering inclined slideways of the sliding cradles 3 and 3', thus producing a horizontal translation of these cradles towards each other and therefore the upsetting of the crankshaft webs.
  • This ram reacts against the lower face of the upper cross member 5 of the apparatus, which transmits the reaction of the operating thrust directly to the upper crosshead 6 of the press, thus tending to counteract its downward stroke.
  • the rams for clamping the lateral holding blocks are dispensed with and their action is replaced by the vertical component of the force transmitted via the inclined slideways of the upper cross member to slideways registering therewith, these registering slideways being however integral with upper holding blocks in lieu of the sliding cradles.
  • This device is illustrated in FIG. 10 showing the forging apparatus in its open position (prior to the forging operation) and also in FIG. 11 showing the same apparatus in its closed position (end of forging operation).
  • This apparatus comprises a lower frame structure 41 supported by the bed or worktable 42 of a conventional forging press; a pair of sliding cradles 43 and 43 carried by slideways 44 and 44' provided on said blocks, thus causing the symmetric movement of these holding blocks towards each other and therefore the upsetting or shaping of the web metal.
  • Adjustable limit stops (not shown) are provided for limiting the relation to the upper cross member the lowermost position of each upper lateral die-holding block and consequently their initial relative distance.
  • the rarns 64 and 64' are provided for pressing these upper lateral die-holding blocks against said stop at the beginning of the forging operation.
  • the cradles 43 and 43' are also moved apart from their closed position by the same distances as the upper lateral dieholding blocks and are urged against limit stops (not shown) carried by the lower frame structure 41.
  • Upper portion of the apparatus refers to the assembly A including all the component elements secured to or associated with the upper crossmember 45;
  • Lower portion of the apparatus refers to the assembly B including all the component elements secured to or associated with the lower frame structure 41,
  • Closed position of the apparatus means the position assumed not only by the apparatus but by all or any of its component elements at the end of the forging operation;
  • Open position of the apparatus means the position assumed not only by the apparatus but by all or any of its com- "ponent elements before the forging operation, with the press crosshead 46 in its uppermost position.
  • FIGS. 10 and 11 The Open" and Closed" positions of the apparatus are illustrated in FIGS. 10 and 11 respectively.
  • the apparatus Before beginning the forging operation, of course, the apparatus is in its open position.
  • the upper lateral die-holding blocks 63 and 63' are each moved away from their closed position by a distance equal to the web upsetting stroke.
  • this symmetric diverging movement implies, for both die-holding blocks, a downward movement in relation to the cross member 45. It is this relative downward movement of the upper lateral die-holding blocks (which takes place under these conditions) that permits during the forging operation proper the relative downward movement ofthe upper cross member in relation to the upper lateral die-holding the upper die members 55 and 57 thereof engage the lower die members 54 and 56, thus clamping the blank 48 therebetween.
  • the upper lateral die-holding blocks 63 and 63 engage at the same time the sliding cradles 43 and 43', the upper crankpin die 50 engaging on the other hand the lower crankpin die 51.
  • Key means prevent any relative horizontal movement between the cradles 43 and 43', on the one hand, and the die-holding blocks 63 and 63', respectively.
  • the thrust exerted by the hydraulic rams 64 and 64' against the die-holding blocks 63 and 63 is amply sufficient to prevent the upperv die members 55 and 57 from being lifted in relation to the lower lateral die members 54 and 56 respectively.
  • the movable crosshead 46 of the press is raised and thus caused to carry along during its upwards stroke the upper portion of the apparatus; the upper die-holding blocks 63 and 63' are thus disengaged from the cradles 43'and 43 and the lower die members 55 and 57 as well as theupper crankpin die 50 are disengaged from the blank 48. Then, it is only necessary to remove the blank 48 from the apparatuswhich, after the movement of the die members away from each other, is ready to initiate another forging cycle.
  • the lifting height necessary for extracting the lower portion B of the apparatus from the press table by means of the pull means usually associatedtherewith is definitely inferior to that required for performing the same operation in the case of known apparatus such as described in the British Pat. No. 622,938.
  • This feature permits of constructing for a same press an apparatus capable of forging webs of greater dimensions than those permitted by the use of a conventional forging apparatus.
  • crankshaft blanks and similar workpieces having considerably reduced machining allowances and also a continuous grain flow structure which improves very considerably the fatigue strength, or wear and tear resistance, of the parts thus forged.
  • An apparatus for forging crankshafts and like workpieces to be fitted to a forging press having a movable crosshead comprising a pair of cradles mounted to slide horizontally in relation to said press in opposite directions, a cam face on each cradle, a slideway for each cradle, an -upper cross member having a slideway registering with said cradle cam face mounted for engagement by said movable crosshead, each cradle comprising a lateral die member to hold the blank to be forged during the forging operation proper and to upset the blank metal as a consequence of the movement of said cradles towards each other, a lower crankpin die, an upper crankpin die coacting with said lower crankpin die, said dies during the forging operation clamping the blank and offsetting the upset metal both transversely and downwardly, a piston movable in relation to said upper cross member on which said upper crankpin die is mounted, a hydraulic ram having its cylinder body carried by said cross member controlling said piston, a calibrated
  • Apparatus as set forth in claim 1 comprising lateral upper dies, upper blocks integral with said lateral upper dies and lower lateral dies located in said sliding cradles, the locking of said upper dies upon said corresponding lower dies being obtained by means of the vertical component of the force exercised by said upper cross member upon the corresponding upper block through the intermediary of two inclined guideways assuring the support of said upper cross member upon said die holding block, said locking maintaining the blank metal to be forged upon its pouring between said dies and preventing narrow openings of the latter during said operation, said upper die holding blocks resting upon said sliding cradles and urging them symmetrically towards one another in order to produce said pressing back of the blank metal to be forged, additional hydraulic rams for holding said upper die holding blocks against abutments at the beginning of the forging operation, means for rendering said rams inoperative when the forging operation begins and drawing then against said upper die and blockingit there to the end of the forging in order'to permit the opening of the apparatus and removal of the forged piece.

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  • Mechanical Engineering (AREA)
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US841272A 1968-07-19 1969-07-14 Apparatus for forging crankshafts and the like Expired - Lifetime US3650143A (en)

Applications Claiming Priority (2)

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FR159915 1968-07-19
FR6904677A FR2033429A6 (en) 1969-02-24 1969-02-24 Forging crankshafts and similar elements

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US (1) US3650143A (enrdf_load_stackoverflow)
JP (1) JPS4924337B1 (enrdf_load_stackoverflow)
CS (1) CS184303B2 (enrdf_load_stackoverflow)
DE (1) DE1936012C2 (enrdf_load_stackoverflow)
DK (1) DK146499C (enrdf_load_stackoverflow)
GB (1) GB1229539A (enrdf_load_stackoverflow)
NL (1) NL159301B (enrdf_load_stackoverflow)
SE (1) SE371589B (enrdf_load_stackoverflow)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867832A (en) * 1971-07-31 1975-02-25 Tadeusz Rut Method of forging of various shaped elements on elongated bars and a device for the use of this method
US4041755A (en) * 1975-03-15 1977-08-16 Instytut Obrobki Plastycznej Method and devices for forging single crank throws of semi-built up crankshafts
US4531391A (en) * 1981-04-01 1985-07-30 Ab Thorns Mekaniska Verkstad Adaptive method and apparatus for correcting deviations in the shape of objects
US4646551A (en) * 1983-12-13 1987-03-03 Instytut Obrobki Plastycznej Apparatus for forging of crankshafts in presses
CN102172758A (zh) * 2011-01-26 2011-09-07 上海海隆石油管材研究所 垂直分模水平夹紧多模腔成形卧式钻杆加厚液压机
US20140230206A1 (en) * 2013-02-21 2014-08-21 Dusan Milicevic Method of Eliminating the Heat Affected Zone in a Welded Crankshaft
US20150231689A1 (en) * 2012-09-07 2015-08-20 Nippon Steel & Sumitomo Metal Corporation Apparatus for forming a blank for finish forging for a forged crankshaft
US20150314365A1 (en) * 2012-12-12 2015-11-05 Nippon Steel & Sumitomo Metal Corporation Apparatus for forming a blank for finish forging for a forged crankshaft for a three-cylinder engine and method for manufacturing a forged crankshaft for a three-cylinder engine using the same
US9283614B2 (en) 2010-12-16 2016-03-15 Viktor Andriiovych Lazorkin Four-die forging device for forging presses
US20160250679A1 (en) * 2013-11-21 2016-09-01 Nippon Steel & Sumitomo Metal Corporation Method for producing a forged crankshaft
US20160256917A1 (en) * 2013-11-21 2016-09-08 Nippon Steel & Sumitomo Metal Corporation Method for producing a forged crankshaft
CN106311955A (zh) * 2016-08-29 2017-01-11 武汉重工铸锻有限责任公司 具有预镦粗功能的快速镦锻曲轴装置及用其镦锻的方法
US9803685B2 (en) 2016-02-17 2017-10-31 Ford Global Technologies, Llc Crankshaft
US11045864B2 (en) * 2015-12-25 2021-06-29 Nippon Steel Corporation Method for producing forged crankshaft
US11433493B2 (en) * 2015-12-01 2022-09-06 Bharat Forge Limited Fluid end and method of manufacturing it

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YU1979A (en) * 1978-01-14 1983-02-28 Inst Obrobki Plastucznej Device for forging in a press
PL121730B1 (en) * 1979-06-09 1982-05-31 Instytut Obrobki Plastycznej Forging apparatus
JPS603404U (ja) * 1983-06-21 1985-01-11 三菱自動車工業株式会社 隙間ゲ−ジ
US5115663A (en) * 1989-11-25 1992-05-26 Honda Giken Kogyo Kabushiki Kaisha Method for forming a crankshaft
RU2254198C1 (ru) * 2003-10-28 2005-06-20 Открытое акционерное общество "КАМАЗ-Металлургия" Способ изготовления поковок коленчатых валов
RU2446906C1 (ru) * 2010-10-18 2012-04-10 Открытое Акционерное Общество "Тяжпрессмаш" Четырехбойковое ковочное устройство
UA100610C2 (ru) * 2011-06-22 2013-01-10 Виктор Андреевич ЛАЗОРКИН Четырехбойковое ковочное устройство для ковочных прессов

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US2534613A (en) * 1944-12-07 1950-12-19 Cie Forges Et Acieries Marine Apparatus for forging parts showing important variations in their cross section
US2747253A (en) * 1951-02-19 1956-05-29 Cie Forges Et Acieries Marine Device for forging parts having large cross-sectional variations
GB757526A (en) * 1953-11-23 1956-09-19 Loire Atel Forges Improvements in or relating to apparatus for forging crank-shafts
US2790227A (en) * 1948-05-06 1957-04-30 Amelia S Fine Process of making crank shafts
US2827685A (en) * 1952-07-24 1958-03-25 English Steel Corp Ltd Apparatus for forging crank-shafts and like work-pieces

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FR994026A (fr) * 1944-12-07 1951-11-09 Cie Des Forges & Acieries De L Appareil pour le forgeage des pièces de forge présentant des variations de section importantes
FR56233E (fr) * 1946-07-05 1952-09-19 Cie Forges Et Acieries Marine Appareil pour le forgeage des pièces de forge présentant des variations de section importantes
FR61415E (fr) * 1951-02-19 1955-05-04 Cie Forges Et Acieries Marine Appareil pour le forgeage des pièces de forge présentant des variations de section importantes
DE1015665B (de) * 1951-02-19 1957-09-12 Cie Forges Et Acieries Marine Schmiedepresse, insbesondere fuer Kurbelwellen

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
US2534613A (en) * 1944-12-07 1950-12-19 Cie Forges Et Acieries Marine Apparatus for forging parts showing important variations in their cross section
US2790227A (en) * 1948-05-06 1957-04-30 Amelia S Fine Process of making crank shafts
US2747253A (en) * 1951-02-19 1956-05-29 Cie Forges Et Acieries Marine Device for forging parts having large cross-sectional variations
US2827685A (en) * 1952-07-24 1958-03-25 English Steel Corp Ltd Apparatus for forging crank-shafts and like work-pieces
GB757526A (en) * 1953-11-23 1956-09-19 Loire Atel Forges Improvements in or relating to apparatus for forging crank-shafts

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3867832A (en) * 1971-07-31 1975-02-25 Tadeusz Rut Method of forging of various shaped elements on elongated bars and a device for the use of this method
US4041755A (en) * 1975-03-15 1977-08-16 Instytut Obrobki Plastycznej Method and devices for forging single crank throws of semi-built up crankshafts
US4531391A (en) * 1981-04-01 1985-07-30 Ab Thorns Mekaniska Verkstad Adaptive method and apparatus for correcting deviations in the shape of objects
US4646551A (en) * 1983-12-13 1987-03-03 Instytut Obrobki Plastycznej Apparatus for forging of crankshafts in presses
US9283614B2 (en) 2010-12-16 2016-03-15 Viktor Andriiovych Lazorkin Four-die forging device for forging presses
CN102172758A (zh) * 2011-01-26 2011-09-07 上海海隆石油管材研究所 垂直分模水平夹紧多模腔成形卧式钻杆加厚液压机
CN102172758B (zh) * 2011-01-26 2013-02-06 上海海隆石油管材研究所 垂直分模水平夹紧多模腔成形卧式钻杆加厚液压机
US9630239B2 (en) * 2012-09-07 2017-04-25 Nippon Steel & Sumitomo Metal Corporation Apparatus for forming a blank for finish forging for a forged crankshaft
US20150231689A1 (en) * 2012-09-07 2015-08-20 Nippon Steel & Sumitomo Metal Corporation Apparatus for forming a blank for finish forging for a forged crankshaft
US20150314365A1 (en) * 2012-12-12 2015-11-05 Nippon Steel & Sumitomo Metal Corporation Apparatus for forming a blank for finish forging for a forged crankshaft for a three-cylinder engine and method for manufacturing a forged crankshaft for a three-cylinder engine using the same
US9707618B2 (en) * 2012-12-12 2017-07-18 Nippon Steel & Sumitomo Metal Corporation Apparatus for forming a blank for finish forging for a forged crankshaft for a three-cylinder engine and method for manufacturing a forged crankshaft for a three-cylinder engine using the same
US9254518B2 (en) 2013-02-21 2016-02-09 Dusan Milicevic Method of eliminating the heat-affected zone in a welded article
US9095891B2 (en) * 2013-02-21 2015-08-04 Dusan Milicevic Method of eliminating the heat affected zone in a welded crankshaft
US20140230206A1 (en) * 2013-02-21 2014-08-21 Dusan Milicevic Method of Eliminating the Heat Affected Zone in a Welded Crankshaft
US20160250679A1 (en) * 2013-11-21 2016-09-01 Nippon Steel & Sumitomo Metal Corporation Method for producing a forged crankshaft
US20160256917A1 (en) * 2013-11-21 2016-09-08 Nippon Steel & Sumitomo Metal Corporation Method for producing a forged crankshaft
US10058912B2 (en) * 2013-11-21 2018-08-28 Nippon Steel & Sumitomo Metal Corporation Method for producing a forged crankshaft
US10124398B2 (en) * 2013-11-21 2018-11-13 Nippon Steel & Sumitomo Metal Corporation Method for producing a forged crankshaft
US11433493B2 (en) * 2015-12-01 2022-09-06 Bharat Forge Limited Fluid end and method of manufacturing it
US11045864B2 (en) * 2015-12-25 2021-06-29 Nippon Steel Corporation Method for producing forged crankshaft
US9803685B2 (en) 2016-02-17 2017-10-31 Ford Global Technologies, Llc Crankshaft
CN106311955A (zh) * 2016-08-29 2017-01-11 武汉重工铸锻有限责任公司 具有预镦粗功能的快速镦锻曲轴装置及用其镦锻的方法

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NL159301B (nl) 1979-02-15
GB1229539A (enrdf_load_stackoverflow) 1971-04-21
NL6911154A (enrdf_load_stackoverflow) 1970-01-21
SE371589B (enrdf_load_stackoverflow) 1974-11-25
DK146499C (da) 1984-04-02
DE1936012A1 (de) 1970-01-29
DK146499B (da) 1983-10-24
CS184303B2 (en) 1978-08-31
JPS4924337B1 (enrdf_load_stackoverflow) 1974-06-21
DE1936012C2 (de) 1984-06-14

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