US3460239A - Method and apparatus for locating a casting preparatory to machining thereof - Google Patents

Method and apparatus for locating a casting preparatory to machining thereof Download PDF

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Publication number
US3460239A
US3460239A US472761A US3460239DA US3460239A US 3460239 A US3460239 A US 3460239A US 472761 A US472761 A US 472761A US 3460239D A US3460239D A US 3460239DA US 3460239 A US3460239 A US 3460239A
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United States
Prior art keywords
casting
piston
locating
fixture
radial
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Expired - Lifetime
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US472761A
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English (en)
Inventor
Maurice George Nix
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Associated Engineering Ltd
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Associated Engineering Ltd
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
    • B23B31/19—Chucks with simultaneously-acting jaws, whether or not also individually adjustable moving parallel to the axis of the chuck
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/18—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for positioning only
    • 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
    • Y10T279/00—Chucks or sockets
    • Y10T279/34—Accessory or component
    • Y10T279/3487—Tool or work stop or locator
    • 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
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49249—Piston making
    • Y10T29/49256—Piston making with assembly or composite article making
    • Y10T29/49261—Piston making with assembly or composite article making by composite casting or molding
    • 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
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49998—Work holding

Definitions

  • the present invention relates to a method of locating hollow or tubular castings, more particularly the castings of pistons for internal combustion engines, compressors or the like, to enable a machining operation to be carried out thereon, and also to a fixture for locating or holding such castings during these operations.
  • the invention also relates to castings adapted for carrying out the method.
  • the object of the invention is to provide a method of and means for accurately fixturing or locating a hollow or tubular casting from its cast internal shape or surface to enable machining operations concentric with the internal shape to be carried out on its external surfaces, and which makes allowances for variations in castings produced by different dies or cores, or due to wear of the die cores which takes place during the continuous casting.
  • the invention consists in the method of locating a piston casting for machining purposes, comprising locating the casting by means of radial locating supports which engage the internal surface of the casting at a plurality of points, divided into two groups, circumferentially spaced and radially fixed in two axialy spaced annular zones of the interior of the side wall of the casting to provide transverse centralising location, and centralising the casting by urging the two groups of radial locating supports axially with respect to the casting and to each other to cause said points to come into wedging engagement with parts of the interior of the casting in said spaced zones.
  • the invention also consists in a casting, more particularly a piston casting, provided with two internal axially spaced circumferentially extending generally frustoconical surface zones diverging towards the open end of the piston skirt, one zone being disposed between the underside of the piston crown and the gudgeon pin bosses, and the other zone being disposed adjacent the open end of the piston skirt.
  • FIGURE 1 is a diagrammatic longitudinal section of a piston casting according to the invention, and showing the seven points by which it is located, according to this invention, during a machining or like operation;
  • FIGURE 2 is a side view of a fixture according to one embodiment of this invention for locating a piston casting at seven points, a piston casting being indicated in section in its position of location on the fixture;
  • FIGURE 3 is a partial axial section of the fixture shown in FIGURE 2;
  • FIGURE 4 is a partial longitudinal section of a fixture according to a second embodiment of the invention.
  • FIGURE 5 is a longitudinal section of an embodiment of a piston according to the invention.
  • FIGURE 8 is a longitudinal section of a piston casting showing diagrammatically a modified form of longitudinal location support.
  • FIGURE 9 is a diagrammatic plan view indicating the positions of the core pieces and longitudinal location supports of the casting shown in FIGURE 8.
  • the parts of the internal surface which they contact are constituted by two frusto-conical zones, centred about the longitudinal axis of the piston, which diverge towards the open end of the piston skirt With a taper, conveniently of about with respect to the longitudinal axis of the piston.
  • FIGURE 1 diagrammatically shows a piston casting for example an aluminium alloy die-cast piston casting, having a crown 1, a skirt 2, and formed internally, according to the invention, with a pair of axially-spaced circumferentially extending frusto-conical internal bands or zones 3 and 4 which diverge towards the open end of the skirt 2.
  • the angle of taper may be the same for both zones 3 and 4, and may for example be of the order of 5 with respect to the longitudinal axis of the casting.
  • FIGURES 2 and 3 One embodiment of the fixture or device according to this invention for supporting and locating the casting is shown in FIGURES 2 and 3.
  • This fixture comprises a longitudinal location support member in the form of a stepped pillar or post 8, rigidly mounted on, or integral with, a base 9, and formed with a rounded upper end 8a which is adapted to engage the undeside of the piston crown 1 and constitutes the support point 5 in FIGURE 1.
  • two radial location support members namely upper and lower members and 11 respectively, each comprising a body part 10:: and 11a and three radially extending arms 10b and 11b respectively, the radially outer ends of which are adapted to engage the conical zones 3 and 4 (FIGURE 3) respectively, and constitute, respectively, the radial support points 6 and 7 shown in FIGURE 1.
  • the arms 10b and 11b although they may be integral with the body parts 10a and 11a, are in this embodiment, secured thereto by counter sunk screws 20.
  • the arms 11b and one of the arms 10b are radially disposed and are individually secured to their respective body part.
  • the two remaining arms 1% comprise opposite ends of the cross piece of a T- shaped element 21 secured by its vertical limb to the member 10.
  • the upper member 10 is prevented from sliding off the upper end of the post 8, when the piston casting is removed, by means of a circlip 26 located in an annular groove in the upper end of the post 8, and engageable with the bottom of a transverse slot or recess 10c in the upper end of the member.
  • the member 10 is provided with a recess 10c Within which is located the upper end of a helical compression spring 12 surrounding the post 8.
  • the lower end of the spring 12 bears on a shoulder 8b of the post 8, and normally resiliently urges the upper member 10 towards the upper end 8a of the post.
  • the member 11 and a shoulder 8d on the base 9 are provided with pairs of aligned recesses 11g and 8e respectively, and a helical compression spring 13 is trapped in each pair of recesses.
  • the springs 13 normally urge the lower member 11 in the same axial direction as the member 10.
  • the members 10 and 11 are so arranged that they are axially but not rotationally movable relative to each other and the post 8.
  • the member 10 is of rectangular cross-section and is keyed to the lower member 11, by its lower end 10d, which is lecated in a transverse slot 11d in the upper end of the lower member 11. The interengagement of the end 10d and slot 11d thereby prevent rotation between the members 10, 11 whilst accom modating axial movement therebetween.
  • the lower member 11 is provided with a pair of downwardly extending arms 11e having flat parallel and vertical inwardly facing surfaces 11] which engage correspondingly disposed flat side surfaces 8c of a rectangular shoulder 8d at the lower end of the post 8.
  • the outer rectangular surface of the body part 10a of the upper member 10 is so dimensioned that it provides a clearance, but a reasonably close fit, between the inner faces of the piston pin bosses 16 of the piston casting.
  • the casting is prevented from rotating during machining relative to the members 10 and 11, and therefore relative to the fixture.
  • the groups of three arms 10b and 11b of the fixtures previously described are ideally angularly spaced apart by in each transverse plane, and the arms 10]: are ideally angularly displaced from the arms 1111 by
  • the piston design itself determines the positions of the arms in each plane and their relationship to the arms in the other plane, and this relationship will vary from piston design to piston design.
  • the positions of the arms is dependent upon the size and position of the piston pin bosses 16 and any internal projections or recesses within the piston body or skirt.
  • the fixture is either rigidly secured by its base 9 to a machine table if the fixture is to be maintained stationary during the machining operation, or is fixed to the spindle nose of the machine if the fixture is to be rotated during machining.
  • the piston casting is placed over the device and pressed towards the base 9 (downwardly in FIG- URE 2) whilst orientating the casting so that the arms 1% do not foul the piston pin bosses 16. This pressure brings the radially outer ends of the arms 10b into engagement with the conical zone 3 beneath the piston crown centralising the piston casting about its core adjacent the orown.
  • the casting is pressed further towards the base 9, causing the member 10 to slide along the post 8 towards the member 11, against the action of the spring 12, until the radially outer ends of the arms 11b of the member 11 engage with the conical zone 4- adjacent the open end of the piston skirt 2.
  • the piston casting is now accurately located centrally about its longitudinally axi at both locating planes, the fixture allowing for permitted variations in internal diameters of different castings, due to ear of the casting die core within casting tolerances, by the axial movement of the members 10 and 11 in relation to one another along the piston axis.
  • the casting is then pressed further towards the base 9, simultaneously axially displacing both members 10 and 11 against the action of their respective springs 12 and 13, until the outermost end 8a of the post abuts against the underside of the piston crown, thereby longitudinally locating the casting with respect to the fixture.
  • the casting is held in this position, against the actions of the springs 12 and 13, by means of a clamping bar or member 17 which is urged against the external face of the piston crown 1 to clamp the latter against the post 8.
  • This bar 17 may be separate from and operated independently of the fixture, for example it may form part of a machine on which the fixture is mounted. In this case the bar 17 may be located on an axis coincident with the axis of the post 8 or piston casting, or the axis of the machine spindle.
  • the casting rotates slightly due to forces imposed by the cutting tool until the flat external surfaces of the body part 10a engage the inner faces of the piston pin bosses 16 as shown, and thereby prevent further rotation of the casting relative to the fixture during the machining operation, and provide for a driving torque therebetween.
  • the machining operation is then carried out. If the fixture is used in conjunction with a tool holder carrying two tools at 180 apart or three tools at 120 apart, or more than three tools equally radially spaced, the cutting action further presses or steadies the piston symmetrically on the locating points.
  • the fixture itself since the members 10 and 11 and therefore the two sets of three radial supports are movable along the piston axis, not only accommodates variations in diameter within the casting tolerances on the two locating zones 3 and 4, but also, by reason of the three point support, always makes contact with the three points in each transverse plane (in the manner by which a three legged stool sits evenly on a rough floor) and averages out out-of-roundness within the casting itself, and the diameters of the piston turned at the same time will be concentric with the two locating zone diameters on any one casting.
  • any piston design can be consistently both concentrically and longitudinally located.
  • the fixture will also accommodate a certain amount of reduction in size on the core of the die due to wear on the core during use in the casting operation. In allowing for this wear, the casting will always locate on the three points in each of the two planes, but at different axial positions in each zone. For example a variation of .010" on the internal radius of piston castings can be accommodated by an axial movement of the members 10 and 11 within a range of 0.111" if the zones 3 and 4 have a taper of 5.
  • zones 3, 4 have an axial length of bout 0.25".
  • the final positioning of the inside of the crown at the seventh support point will determine in every case the thickness of the crown during the machining operation, since this point is a fixed dimension from the datum of the lathe or machine on which the crown is being turned, and is used for positioning the facing tool.
  • FIGURE 4 illustrates a modified fixture which may be used to locate a piston casting from which the frustoconical zones 3 and 4 have been omitted.
  • these zones are assimilated by modifying the ends of the arms 10!] and 11b so that the said ends are inclined at an angle, approximating to 5'.
  • These inclined ends cooperate with suitable diameters, shoulders or the like on the internal surface of the piston.
  • the fiixture shown in FIGURE 4 also differs in that the arms 10b and 11b are integral with the body parts 10a and 11a. Moreover, the two members 10 and 11 are located against rotation relative to the post 8, independently of one another, by keys 81 secured to the post 8, and slidable in axial slots 1011 and 11/1 in the members 10 and 11.
  • the springs 12 and 13 shown in FIGURES 2 and 3 are replaced by equivalent resilient means in the form of O-rings 12a, 13a made from a resilient material, for example natural or synthetic rubber, and enclosed in metal housing 12b and 13b.
  • FIGURE 4 The fixture shown in FIGURE 4 is operated in the same manner as described with reference to FIGURES 2 and 3.
  • FIGURES 6 and 7 One practical form of piston design having an internal shape for location by a fixture as shown in FIGURES 2 and 3 is illustrated in FIGURES 6 and 7.
  • the radially outer ends of the arms 10b and 1111 are shown diagrammatically in FIGURE 7 by the arrow heads.
  • the angular relationship of the arms 10b is such that the piston casting may he slid axially onto the device until the arms 10b engage the zone 3 (see FIGURES 2 and 6) without fouling the piston pin bosses 16.
  • the angle between the two arms 1% on the same side of the piston axis is of the order of In practice, however, the device has been found to work very satisfactorily when these two arms are only spaced apart by 40, and the other remaining arm is spaced by an angle of 160 from the other two arms. Since the arms 11b do not have to pass any internal projections on the casting, by virtue of the fact that the zone 4 is disposed at the open end of the piston skirt 2, these arms may be usually disposed at approximately with respect to each other.
  • the outer end 8:: of the post is shown diagrammatically as an arrow head and is located on a rib 18 cast integrally with the piston casting, which serves to reinforce the piston crown 1.
  • FIGURE 8 shows a construction in which the lower zone 4 is spaced from the lower end of the piston skirt to accommodate cut-away portions 19 which provide crankshaft clearance.
  • the piston die core which determines the internal dimensions of the piston casting, generally consists of four sections surrounding a rectangular wedge-shaped centrepiece, the function of the latter being to hold the four sections in their correct position ready for casting.
  • these four sections are mounted on the centre-piece which is centred at both ends, and those surfaces shown as diameters in the piston casting are turned in a lathe.
  • all of the outer diameters of the core are concentric with one another.
  • the two frusto-conical zones for producing the zones 3 and 4 on the piston casting are also turned. There is thus obtained an accurate location which can only change within the normal casting tolerances or due to core wear.
  • the piston core comprises four pieces positioned by a rectangular wedge-shaped centre piece.
  • two of the four pieces namely boss cores 23 carrying piston pin boss cores 23a, together constitute approximately 320 of the piston core, and the portion of the piston casting defined by these boss cores 23 constitutes 85% of the total piston casting weight.
  • These boss cores 23 are separated by side cores 24 which constitute the remaining 40 of the piston core.
  • the two boss cores 23 and the two side cores 24 are positioned by the wedge-shaped centre piece 25, which is also shown in FIGURE 9.
  • each zone may be circumferentially continuous, or may comprise partannular segments separated or interrupted, for example by the internal ribs or other parts of the piston body. Further, such segments need not all be on the same radius provided that the arms of a group are of such lengths that the casting will be centralised on the fixture.
  • one or each member 10 and 11 may be in the form of a disc or cone (or segments thereof) which engage the internal surface of the casting continuously therearound, or along axis.
  • the lower member 11 may be replaced by a frusto-conical member, which engages the open end of the piston skirt.
  • Axial or longitudinal location may be effected by means other than the end 8a of the post 8.
  • longitudinal location may be effected externally of the casting, using the open end of the skirt or the upper surface of the crown, or by providing a limit stop for axial movement of one or other of the radial location members.
  • longitudinal location may be omitted.
  • a method of locating a tubular casting for machining purposes comprising locating the casting by means of radial locating supports which engage the interior of the casting at a plurality of circumferentially spaced, radially fixed, points divided into two groups in two axially spaced annular zones of the interior of the casting to provide transverse centralising location, and centralising the casting by urging the points of each group axially with respect to the casting, and to the other group, to cause the points to come ino wedging engagement with the parts of the interior of the casting in said spaced zones.
  • a method as claimed in claim 1 which includes centralising the casting by means of two relatively axially movable radial locating supports, each of which engages the casting at three points.
  • a fixture for locating a tubular casting for machining comprising a longitudinally extending member over which the casting is adapted to be positioned, and two radial support members each having a plurality of circumferentially spaced, radially inextendible, casting-engaging points, at least one of said radial support members being movable longitudinally of the longitudinally extending member towards and away from the other radial support member, and resilient means for normally urging said two radial support members apart.
  • each radial support member is provided with three radial arms, the radially outer end of each of which constitutes a castingengaging point.
  • a fixture as claimed in claim 8 wherein means are provided for preventing rotation of the radial support members relative to the longitudinally extending member.
  • a fixture as claimed in claim 11, wherein said means comprises a longitudinal locating member constituted by the free end of the longitudinally extending member which is capable of engaging the casting internally.
  • the method of locating a piston casting for machining purposes which consists in locating the casting by locating supports which engage the casting at least at seven points on its internal surface, namely at least at one point on the underside of the piston crown to provide longitudinal location, and at six points divided into two groups, each of three, circumferentially spaced in two axially spaced annular zones of the interior of the side wall of the piston to provide transverse centralising location, holding the casting longitudinally against the longitudinal locating support at said one point, and centralising the casting by urging the radial locating supports at said six other points in wedging engagement with parts of the interior of the casting in said spaced zones.
  • a fixture according to claim 16 wherein said resilient means comprise compression springs, disposed between the radial support members and the longitudinal location support.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Gripping On Spindles (AREA)
US472761A 1964-07-22 1965-07-19 Method and apparatus for locating a casting preparatory to machining thereof Expired - Lifetime US3460239A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB29616/64A GB1118561A (en) 1964-07-22 1964-07-22 Method of and fixture for locating hollow castings for machining purposes

Publications (1)

Publication Number Publication Date
US3460239A true US3460239A (en) 1969-08-12

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US472761A Expired - Lifetime US3460239A (en) 1964-07-22 1965-07-19 Method and apparatus for locating a casting preparatory to machining thereof

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US (1) US3460239A (de)
CH (1) CH451655A (de)
DE (1) DE1502681A1 (de)
ES (1) ES315629A1 (de)
GB (1) GB1118561A (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795405A (en) * 1970-12-04 1974-03-05 Renault Clamping of parts by adherence on axial thrust support
US3889356A (en) * 1972-01-15 1975-06-17 Lucas Electrical Co Ltd Method of supporting distributor blank for machining
US3901519A (en) * 1970-12-04 1975-08-26 Renault Clamping of parts by adherence on axial thrust support
US4852437A (en) * 1988-06-29 1989-08-01 The Cross Company Method and apparatus for locating and clamping a workpiece, such as a piston, prior to rotating same in a machining operation
WO2007025532A1 (de) * 2005-09-01 2007-03-08 Mahle International Gmbh Vorrichtung zum haltern eines kolbens in einer anlage zum beschichten von kolben
US20070113734A1 (en) * 2005-11-23 2007-05-24 Andreas Stihl Ag & Co. Kg Piston for a two-stroke engine and a method of making the same
US20100284756A1 (en) * 2009-05-11 2010-11-11 Tung Fu-Hsiang Tool clamping device of tool seat
US20120260882A1 (en) * 2011-04-15 2012-10-18 Airton Martins Piston and method of making a piston
CN104385195A (zh) * 2014-09-17 2015-03-04 宝鸡石油机械有限责任公司 安装钻井泵十字头销的工装夹具及其装夹方法
CN116900640A (zh) * 2023-08-02 2023-10-20 武汉重型机床集团有限公司 一种高精度超长扁平状薄壁板的加工方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2747977C2 (de) * 1977-10-26 1986-06-19 Dynamit Nobel Ag, 5210 Troisdorf Elektrisch auslösbares Kraftelement mit ausstoßendem Kolben
GB8902525D0 (en) * 1989-04-28 1989-04-28 T & N Technology Ltd Workpiece holding device
DE4037912A1 (de) * 1990-11-29 1992-06-04 Bayerische Motoren Werke Ag Aufnahmevorrichtung fuer einen kolben, insbesondere zu messzwecken
CN110125703B (zh) * 2019-05-27 2024-04-09 东实(武汉)实业有限公司 一种自动调整可重复使用的夹具定位销机构

Citations (6)

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Publication number Priority date Publication date Assignee Title
US3170232A (en) * 1961-08-29 1965-02-23 Western Electric Co Apparatus for positioning components
US3212374A (en) * 1962-08-29 1965-10-19 Nat Broach & Mach Expanding arbor
US3233908A (en) * 1963-10-11 1966-02-08 Gildemeister Werkzeugmasch Work holder for machine tools
US3263536A (en) * 1965-04-12 1966-08-02 Nat Broach & Mach Expanding arbors
US3272041A (en) * 1965-06-28 1966-09-13 Nat Broach & Mach Expanding arbors
US3304078A (en) * 1964-04-22 1967-02-14 Westinghouse Air Brake Co Means for alignment of components of a fabricated article

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3170232A (en) * 1961-08-29 1965-02-23 Western Electric Co Apparatus for positioning components
US3212374A (en) * 1962-08-29 1965-10-19 Nat Broach & Mach Expanding arbor
US3233908A (en) * 1963-10-11 1966-02-08 Gildemeister Werkzeugmasch Work holder for machine tools
US3304078A (en) * 1964-04-22 1967-02-14 Westinghouse Air Brake Co Means for alignment of components of a fabricated article
US3263536A (en) * 1965-04-12 1966-08-02 Nat Broach & Mach Expanding arbors
US3272041A (en) * 1965-06-28 1966-09-13 Nat Broach & Mach Expanding arbors

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795405A (en) * 1970-12-04 1974-03-05 Renault Clamping of parts by adherence on axial thrust support
US3901519A (en) * 1970-12-04 1975-08-26 Renault Clamping of parts by adherence on axial thrust support
US3889356A (en) * 1972-01-15 1975-06-17 Lucas Electrical Co Ltd Method of supporting distributor blank for machining
US4852437A (en) * 1988-06-29 1989-08-01 The Cross Company Method and apparatus for locating and clamping a workpiece, such as a piston, prior to rotating same in a machining operation
US20090278298A1 (en) * 2005-09-01 2009-11-12 Joachim Rienecker Device for holding a piston in a system for coating pistons
WO2007025532A1 (de) * 2005-09-01 2007-03-08 Mahle International Gmbh Vorrichtung zum haltern eines kolbens in einer anlage zum beschichten von kolben
CN101257999B (zh) * 2005-09-01 2011-01-19 马勒国际公司 活塞镀膜设备中的活塞固定装置
US8047519B2 (en) 2005-09-01 2011-11-01 Mahle International Gmbh Device for holding a piston in a system for coating pistons
US20070113734A1 (en) * 2005-11-23 2007-05-24 Andreas Stihl Ag & Co. Kg Piston for a two-stroke engine and a method of making the same
US20100284756A1 (en) * 2009-05-11 2010-11-11 Tung Fu-Hsiang Tool clamping device of tool seat
US20120260882A1 (en) * 2011-04-15 2012-10-18 Airton Martins Piston and method of making a piston
US9616529B2 (en) * 2011-04-15 2017-04-11 Federal-Mogul Corporation Piston and method of making a piston
CN104385195A (zh) * 2014-09-17 2015-03-04 宝鸡石油机械有限责任公司 安装钻井泵十字头销的工装夹具及其装夹方法
CN116900640A (zh) * 2023-08-02 2023-10-20 武汉重型机床集团有限公司 一种高精度超长扁平状薄壁板的加工方法

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Publication number Publication date
GB1118561A (en) 1968-07-03
DE1502681A1 (de) 1970-02-19
ES315629A1 (es) 1966-06-01
CH451655A (de) 1968-05-15

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