EP1230068A1 - Procede et appareil de rodage de pieces a usiner - Google Patents

Procede et appareil de rodage de pieces a usiner

Info

Publication number
EP1230068A1
EP1230068A1 EP00964802A EP00964802A EP1230068A1 EP 1230068 A1 EP1230068 A1 EP 1230068A1 EP 00964802 A EP00964802 A EP 00964802A EP 00964802 A EP00964802 A EP 00964802A EP 1230068 A1 EP1230068 A1 EP 1230068A1
Authority
EP
European Patent Office
Prior art keywords
lapping
workpieces
cassette
discs
assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00964802A
Other languages
German (de)
English (en)
Other versions
EP1230068A4 (fr
Inventor
Daniel Davidovich Malkin
Lev Danielovich Malkin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1230068A1 publication Critical patent/EP1230068A1/fr
Publication of EP1230068A4 publication Critical patent/EP1230068A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
    • B24B37/07—Lapping machines or devices; Accessories designed for working plane surfaces characterised by the movement of the work or lapping tool
    • B24B37/08—Lapping machines or devices; Accessories designed for working plane surfaces characterised by the movement of the work or lapping tool for double side lapping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/005—Control means for lapping machines or devices
    • B24B37/013—Devices or means for detecting lapping completion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies
    • B24B41/061—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/10—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving electrical means

Definitions

  • the present invention relates generally to lapping apparatus, and more particularly to an improved method and apparatus for lapping a group of flat-parallel or cylindrical workpieces.
  • Lapping machines are used to treat the surfaces of workpieces using an abrasive assembly.
  • lapping machines include upper and lower lapping discs which are made of a strong material and have precisely flat working surfaces which are loaded with an abrasive compound.
  • Workpieces are carried within a cassette that is positioned between the upper and lower lapping discs and which effect treatment of the workpieces.
  • the axes of the lapping discs are vertical and coaxial and treatment is accomplished by rotating one or both discs relative to the cassette such that the appropriate surfaces of the individual workpieces are abrased by the working surfaces of the lapping discs.
  • prior art lapping machines utilize cassettes that have sockets formed within for holding individual workpieces and which allow the cassette to be rotated independently from the lapping discs. Accordingly, the workpieces are provided with radial movement having a changing vector of velocity relative to the vertical axis of the lapping discs and move along a spiral trajectory relatively to the lapping disks.
  • a planetary lapping machine utilizes a number of circular cages, each cage having individual workpiece sockets. Each cage is driven by a sun gear and a ring gear of a sun-and-planet gear which are rotated on vertical shafts coaxial with annular upper and lower lapping discs. This construction ensures that the center of workpieces being machined are moved along spiral trajectories over the working surface of the lower and upper lapping discs.
  • Planetary movement is composed of the joint motion of the circular motion of each individual workpiece socket rotating within a circular cage around the individual cage axis and the larger circular orbiting movement of each socket around the axis of the lapping discs.
  • a dual-disc machine is generally used for lapping cylinders and includes a cassette which is driven by an eccentric crank pin so that the cassette rotates in an eccentric manner and at a different speed than the upper and lower discs.
  • one of the lapping discs can be suspended on a shock-absorber and fixedly secured to an unbalanced-mass vibration generator.
  • the lapping discs are connected to each other by elastic elements such as, for example, radial helical coil springs, whose total rigidity exceeds the total rigidity of the shock-absorber.
  • This apparatus provides simultaneous finishing of both surfaces of the workpieces and allows the user to adjust the amount of material to be removed from the workpieces.
  • first and second lapping discs said lapping discs arranged next to one another, each said lapping disc having a working surface with abrasive particles for lapping the surfaces of the workpieces;
  • an oscillating assembly coupled to said lapping discs for providing two-component translational oscillations to said lapping discs in directions which are parallel to said working surfaces of said lapping discs, said translational oscillations being provided at the cutting speed of the group of workpieces;
  • the invention provides a lapping assembly for lapping a group of workpieces at a predetermined cutting speed, said lapping assembly comprising:
  • first and second lapping discs said lapping discs arranged next to one another, each said lapping disc having a working surface with abrasive particles for lapping the surfaces of the workpieces;
  • a cassette positioned between said lapping discs for holding the group of workpieces, said cassette having an opening formed within and dimensioned to receive the group of workpieces, said opening being defined by an inner wall;
  • an oscillating assembly comprising a first motor and first and second eccentric crank pins, said first eccentric crank pin being coupled to said first lapping disc and said second eccentric crank pin being coupled to said second lapping disc, said oscillating assembly providing two-component translational oscillations to said lapping discs in directions which are parallel to said working surfaces of said lapping discs, said translational oscillations being provided at the cutting speed of the group of workpieces.
  • the invention provides a method of lapping a group of workpieces at a predetermined cutting speed, the workpieces being housed within a cassette having a curvilinear opening formed therein, said cassette being positioned between first and second lapping discs, said first and second discs each having a working surface having abrasive particles for lapping a surface of the workpieces, said method comprising the steps of:
  • Fig. 1 is a side cross-sectional view of the lapping assembly according to a preferred embodiment of the present invention
  • Fig. 2 is a sectional view of the lapping assembly taken along the line A-A' of Fig. 1;
  • Fig. 3 is top plan view of an alternative embodiment of the cassette of Fig. 1;
  • Fig. 4 is side cross-sectional view of the lapping assembly containing an alternative embodiment of the cassette of Fig. 1;
  • Fig. 5 is a sectional view of the lapping assembly taken along the line B-B' of Fig.4;
  • Fig. 6 is a side cross-sectional view of an alternative embodiment of the lapping assembly of Fig. 1 which includes a sensing device for controlling the thickness of the finished workpieces;
  • Fig. 7 is a cross-sectional view of a one-spindle lapping machine which may be used in association with the lapping assembly of Fig. 1;
  • Fig. 8 is a cross-sectional view of a one-spindle lapping machine which may be used in association with the lapping assembly of Fig. 1;
  • Fig. 9 is a cross-sectional view of a two-spindle machine which may be used in association with the lapping assembly of Fig. 1;
  • Fig. 10 is a diagrammatic view of the lapping assembly of Fig. 1.
  • Lapping assembly 10 includes a cassette 12 for holding a group of workpieces 14, first and second lapping discs 16, 18 for lapping a group of workpieces 14, elastic members 20a and 20b for preventing rotational movement of first and second lapping discs 16, 18, and crank pins 21 and 22 for effecting oscillation of first and second lapping discs 16, 18.
  • Cassette 12 is a generally round disc with an opening 24 (Fig. 2) dimensioned such that a substantial number of workpieces 14 may be located within opening 24 while still being able to freely circulate within opening 24.
  • Cassette 12 is typically made out of a hard metal (e.g. steel alloy). It is contemplated that cassette 12 is preferably formed with a diameter in the range of between 150 and 2000 millimetres.
  • opening 24 is defined by wall 25 having a scalloped curvilinear shape (e.g. the three intersecting circular shapes as shown). Accordingly, a number of protrusions 26 are present along wall 25 of opening 24 which assist with the circulation of workpieces 14 within opening 24 when lapping assembly 10 is in operation, as will be described. It has been determined that the required angle of the sides of the protrusion 26 can be reduced as the flatness of first and second lapping discs 16, 18 is increased.
  • Cassette 12 is mounted on several rollers 28 rotatably coupled to the body 15 of a lapping machine so that cassette 12 may rotate around a stationary axis. Rotation of cassette 12 may be effected through conventional means such as a gear rim 30 coupled to a cassette- drive motor Ml. It should be understood that cassette 12 could be caused to rotate using alternate types of conventionally known mechanisms.
  • First and second lapping discs 16 and 18 are well known abrasive lapping discs, made of a strong material (e.g. cast iron). First and second lapping discs 16/18 have precisely flat working surfaces 17, 19 which are loaded with an abrasive compound (e.g. diamond, silicon carbide, fused alumina). Lapping (or "cutting") of workpieces 14 is accomplished by rubbing the abrasive-loaded working surfaces 17, 19 of first and second lapping discs 16, 18 against the surfaces of workpieces 14 at an appropriate pressure. As a general rule, it is desired to provide first and second lapping discs 16, 18 with translational two-component oscillations in the plane of their working surfaces 17, 19 (i.e. they experience oscillations in the horizontal plane defined by the X-axis and the Y-axis, as shown).
  • an abrasive compound e.g. diamond, silicon carbide, fused alumina
  • first and second lapping discs 16, 18 are simultaneously drive first and second lapping discs 16, 18 with a disc-drive motor (not shown) through eccentric crank pins 21, 22, respectively (Fig. 1) while restraining them from rotating by elastic members 20a, 20b, respectively.
  • First and second crank pins 21 and 22 are conventional eccentric crank pins and have eccentricity el and e2, respectively.
  • Elastic members 20a and 20b are coupled to first and second lapping discs 16, 18, respectively, as well as to body 15 of lapping machine (Fig. 1 ) to prevent first and second lapping discs 16, 18 from rotating. It should by understood that other conventionally known restraining members could be used in place of elastic members 20a and 20b. Accordingly, first lapping disc 16 is provided with translational movement in the XI and Yl directions and second lapping disc 18 is provided with translational movement in the X2 and Y2 directions, as shown.
  • first and second lapping discs 16, 18 could be orientated in any other plane.
  • first lapping disc 16 is provided with antiphase harmonic oscillation such that the XI and Yl components are equal in frequency (but 90 degrees out of phase) and have an amplitude of el and second lapping disc 18 is provided with antiphase harmonic oscillation such that the X2 and Y2 components are equal in frequency (but 90 degrees out of phase) and have an amplitude of e2.
  • second lapping disc 18 is provided with antiphase harmonic oscillation such that the X2 and Y2 components are equal in frequency (but 90 degrees out of phase) and have an amplitude of e2.
  • harmonic oscillation to first and second lapping discs 16, 18 such that the XI, Y 1 and X2, Y2 components are antiphase (i.e. the oscillations of first lapping disc 16 are 180 degrees out of phase with those of second lapping disc 18).
  • first and second lapping discs 16, 18 may be provided with different amounts of translational movement (e.g. arbitrary frequencies and amplitudes of oscillation). However, in any case, in order for first and second lapping discs 16, 18 to provide effective treatment of workpieces 14, first and second lapping discs 16, 18 must be oscillating at an appropriate cutting speed for treating the group of workpieces 14.
  • first and second lapping discs 16, 18 When first and second lapping discs 16, 18 are provided with an oscillation of equal frequency and amplitude in antiphase, the forces of friction which act on the surfaces of workpieces 14 will cancel each other out and workpieces 14 will essentially remain motionless between first and second lapping discs 16, 18. Even where there is some small difference in the force of friction being applied to the surfaces of an individual workpiece 14 which results in it being "captured” (i.e. caught and moved) by the lapping disc which exerts the stronger force, collisions with other workpieces, collision with the walls of the socket, and general forces of inertia will quickly bring workpiece 14 to a stop and prevent it from oscillating within opening 24. It is noted that the stabilizing effect of the general inertia will increase as acceleration of oscillations of first and second lapping discs 16, 1 8 increases.
  • Cassette 12 must be rotated at a high enough speed such that individual workpieces 14 are circulated within opening 24. If a workpiece 14 remains within a particular area, the sludge which is produced during abrasive treatment, will quickly slow down treatment, almost to a stop. However, cassette 12 must also be rotated at a low enough speed so that the speed of movement of workpieces 14 within opening 24 is slow enough so as not to affect the effectiveness of cutting. Specifically, it has been determined that cassette 12 must be rotated such that points on the outside edge of cassette 12 have a linear speed which is less than the cutting speed appropriate for a particular group of workpieces 14,
  • wall 25 of opening 24 generally urges workpieces 14 to move in the same general direction as cassette 12.
  • workpieces 14 positioned at a farther distance R from the center of opening 24 will have a greater linear speed than workpieces 14 positioned at a closer distance R' from the center of opening 24.
  • working surfaces 17, 19 of first and second lapping discs 16, 18 will exert greater forces of friction on those workpieces 14 positioned further away from the center of opening 24 than on those workpieces 14 positioned closer to the center of opening 24.
  • workpieces 14 positioned further from the center of opening 24 will experience more of a retarding force against forward motion than workpieces 14 positioned closer to the center of opening 24.
  • first and second lapping discs 16, 18 assist in urging workpieces 14 to circulate within opening 24. If first and second lapping discs 16, 18 were motionless (i.e. not undergoing oscillation), workpieces 14 would move within cassette 12 around the axis of cassette 12. Due to the combination of oscillations of the first and second lapping discs 16, 18 and the rotation of cassette 12, it has been observed that workpieces 14 move within opening 24 as if workpieces 14 were being pushed by cassette 12 under conditions of pseudo-viscous friction. This "force of friction" has been observed to increase as the speed of workpieces 14 increases.
  • first and second lapping discs 16, 18, will be more evenly worn than is possibly using conventional lapping machines and lapping assembly 10 will provide even treatment to workpieces 14 on both sides. Since opening 24 is large enough to hold large quantities of workpieces 14 and cassette 12 does not require every workpiece 14 to be put in a separate socket, a higher number of workpieces 14 may be processed than is possible using conventional lapping machines and loading and unloading of workpieces 14 can be accomplished at a much faster rate. Also, when loading workpieces 14 into opening 24, it is not necessary to position each workpiece 14 flat on second lapping disc 16. Workpieces 14 are arranged on top of each other will quickly array themselves into one layer on the surface of second disc 16 once circular oscillation is provided to cassette 12. Finally, when cassette 12 is filled with workpieces 14, it is possible to "correct" (i.e. re-establish a flat profile of) working surface 17, 19 of first and second lapping discs 16, 18, 18, preferably using cylinders.
  • opening 24 of cassette 12 can be of any general shape, as long as at least two points on wall 25 of opening 24 are spaced apart from the center of rotation of either cassette 12 and/or first and second lapping discs 16, 18 at varying distances. That is, opening 24 can be of any general shape which allows workpieces 14 positioned against wall 25 to be able to easily move to another position along wall 25 which is at a different distance away from the center of rotation discussed above.
  • Fig. 3 shows an alternative embodiment of lapping assembly 10 wherein a socket-type cassette 42 is utilized.
  • Cassette 42 contains a number of apertures 34, each of which are sized to receive a satellite disc 36.
  • Each satellite disc 36 has a diameter which is slightly smaller than that of the corresponding aperture 34 and contains individual sockets 38 adapted to receive individual workpieces 14. Where there is are insufficient number of workpieces 14 to fill the space of opening 24, a smaller number of workpieces 14 can still be treated by inserting individual workpieces 14 into cassette 42.
  • Figs. 4 and 5 show an alternative embodiment of lapping assembly 10 wherein an extended cassette 52 is used to further facilitate automatic loading and unloading of workpieces 14.
  • Cassette 52 includes a plurality of identical openings 54, each opening 54 having an outside edge
  • cassette 52 is motionless during treatment and first and second lapping discs 16, 18 are oscillated using eccentric crank pins 21 and 22 (Fig. 5), as previously described in relation to Figs. I and 2.
  • elastic members are not employed to restrain the rotational movement of first and second lapping discs 16, 18.
  • a conventional cogwheel drive mechanism having cogwheels 62 and 64 is seated on first and second lapping discs 16, 18, and used to drive eccentric crank pins 21 and 22 as shown.
  • Gear wheels 66 and 68 are coupled to cogwheels 62 and 64, respectively as well as to body 15 of the lapping machine. It should be understood that any conventionally known drive mechanism may be used to rotate one or both of first and second lapping discs 16, 18, as appropriate.
  • cassette 12 when cassette 12 is fixed and first and second lapping discs 16, 18, are oscillated in the eccentric manner described, workpieces 14 generally experience a combination of oscillatory forces from first and second lapping discs 16, 18 in combination with rotational forces around the axis of first and second lapping discs 16, 18 (i.e. workpieces are "dragged" behind first and second lapping discs 16, 18).
  • the overall trajectory of workpieces 14 is the combination of motion represented by arrow A' and arrow B'.
  • the cassette of this embodiment could equally be of the form of cassette 12, previously described in relation to Figs. 1 and 2. In such an arrangement instead of rotating cassette 12, first and second lapping discs 16, 18 are rotated, such that the same relative speed between cassette 12 and first and second lapping discs 16, 18 is provided.
  • Fig. 6 shows an alternative embodiment of lapping assembly 10 wherein the height to which workpieces 14 are treated can be controlled.
  • second lapping disc 18 is coupled to a marking element 70 through rigid support 72.
  • First lapping disc 16 is coupled to a sensor 74 through rigid support 76. It is possible to control the height of the finished workpiece 14 by setting the calibration instrumentation of sensor 74 to indicate when marking element 70 is a certain distance D away from sensor 74. Once sensor 74 detects and indicates (e.g. using an indicator LED) that marking element 70 is a distance D away, lapping assembly 10 could be prevented from continuing treatment of workpieces 14 either manually, or automatically using a microcontroller, as is conventionally known.
  • Fig. 7 shows an alternative embodiment of the present i ⁇ vention as a one-spindle lapping machine 100 which may be used to oscillate first and second lapping discs 16, 18 and to rotate cassette 12 of lapping assembly 10, as previously discussed.
  • Lapping machine 100 also provides a mechanism for balancing the oscillating first and second lapping discs 16, 18 so that when first and second lapping discs 16, 18 are oscillated at optimum speed, minimal oscillations are transferred to body 15 of lapping machine 100.
  • Lapping machine 100 includes a rigid frame 102, a second disc spindle assembly 104, an first disc spindle assembly 106, a bottom spindle assembly 108, and a pressurizing assembly 110.
  • Second lapping disc 18 is coupled to a tank 112 and is seated on nave 114 which is equipped with a radially supporting rolling bearing, as is conventionally known.
  • Second crank pin 22 is coupled to a driving shaft 116 which rotates inside nave 114.
  • Elastic members 20b are coupled to second lapping disc 18 and to body 15 of lapping machine 100 to prevent second lapping disc 18 from rotating about its axis. The resulting motion is a two-component translational oscillation, as previously described.
  • First lapping disc 16 receives circular oscillations from first disc spindle assembly 106 through rigid frame 102 and two dog columns 118, which enter openings 120 of plate 122, rigidly connected to first lapping disc 16. In order to effect noiseless breaking of dog columns 118, rolling bearings could be installed in openings 120.
  • First crank pin 21 rotates inside nave 119 and is rigidly connected to a drive shaft 124, which rotates inside bottom nave 125 of motionless spindle assembly 108 by means of disc-drive motor M2.
  • Elastic members 20a are coupled to first lapping disc 16 and to body 15 of lapping machine 100 to prevent first lapping disc 16 from rotating about its axis. The resulting motion is a two- component translational oscillation, as previously described.
  • Balancing of lapping assembly 100 is achieved by driving first and second lapping discs 16, 18 in an antiphase manner through rigidly fixed together crank pins 21 and 22, respectively.
  • Crank pins 21 and 22, together with drive shaft 124 form a unified spindle.
  • eccentricities el and e2 of crank pins 21 and 22, respectively must be chosen such that the static moment of first lapping disc 16 (i.e. Glel where G 1 is the combined weight of first lapping disc 16 and associated parts rigidly connected) is equal to that of second lapping disc 18 (i.e. G2e2 where G2 is the combined weight of second lapping disc 18 disc 16 and associated parts rigidly connected).
  • first and second lapping discs 16, 18 are oscillated in antiphase
  • the cutting speed of lapping assembly 10 will be proportional to the sum of the eccentricities el and el (i.e. the sum of the eccentricity of the first crank pin 21 and that of the second crank pin 22).
  • first and second lapping discs 16, 18 must be pressed together with an appropriate force G as is effected by pressurizing assembly 110.
  • Traverse member 126, movable on columns 127 and driven by motor M3 through conventionally known spring and hinge assembly 111, can be used to provide a specific amount of force G to first lapping disc 16 which is movably coupled to a set of dog columns 118, as shown.
  • traverse member 126 could be lowered with the held of pneumatic or hydraulic cylinders.
  • plate 122 (rigidly coupled to first lapping disc 16) is elevated over dog columns 118 and is held by swivel-supporting bolts 128.
  • Unavoidable unbalancing forces can be dampened by providing lapping machine 100 with a heavy body 15 and through the use of conventional shock absorbers 130.
  • force G is provided to first lapping disc 16 through transverse member 126, swivel-supporting bolts 128, and flexibly adjusting bolts 128a such that first lapping disc 16 will self-set itself into a horizonal operational position.
  • a spherical hinge, elastic element, etc. may be used instead of bolts 128a.
  • Fig. 8 shows another embodiment of the present invention as a one-spindle lapping machine 200 which differs from lapping machine 100 in that it does not use driving shaft 124 and motionless spindle assembly 108 of Fig. 7.
  • lapping machine 200 is used to rotate cassette 12 and to provide oscillations to first and second lapping discs 16, 18.
  • Second lapping disc 18 oscillates on swivel-supported bolts 132, although rubber-metallic supports, elastic bolts or planar rolling or sliding supports could be used.
  • First lapping disc 16 is supported on swivel- supporting bolts 128 as discussed in respect of lapping machine 100.
  • the combination of these two support structures provides lapping machine 200 with a self-balancing mechanism. That is, even if the mass of first and /or second lapping discs 16, 18 change, balancing and correlation of the real dynamic eccentricities will be adaptively achieved during the course of operation of lapping machine 200 as a result of the relative masses of weights of first and second lapping discs 16, 18 (i.e. Gl and G2) and the sum of eccentricities el and e2.
  • Fig. 9 shows another embodiment of the present invention as a two-spindle lapping machine 300.
  • Lapping machine 300 is used to rotate cassette 12 and to provide oscillations to first and second lapping discs 16, 18.
  • Lapping machine 300 uses separate eccentric crank pins 21 and 22 which independently rotate in their own naves 136 and 138, respectively.
  • Crank pins 21 and 22 are fixed on diving shafts 140, 142 held in first and second naves 144 and 146.
  • Second nave 146 is fixed on body 15 of lapping machine 300, and first nave 144 is fixed on traverse member 126.
  • first and 5 second lapping discs 16, 18 are supplied with oscillations having eccentricities el and e2, in antiphase.
  • spindle assembly 144 is coupled to first lapping disc 16 through a spherical hinge 254. The combination of these supporting structures have the effect of reducing the amount of oscillation which is transferred to body 15 of lapping machine
  • weights 154 and 156 can be coupled to lapping machine 300, as shown. Unbalanced weights 154 and 156 are selected in such a way so as to compensate for the centrifugal moments and forces.
  • sensor 74 and marking element 70 are installed within lapping machine 300. Accordingly, it is possible to control 0 the height of the finished workpiece 14 by setting the calibration instrumentation of sensor 74 to indicate when marking element 70 is a certain distance D away from sensor 74, as previously described.
  • Fig. 10 shows lapping assembly 10 in use within a typically lapping machine. Specifically, a user loads a sufficient number of
  • first lapping disc 16 may be lowered and locked into position with second lapping disc 18. In this position, the working surfaces 17, 19 of
  • first and second lapping discs 16, 18 are brought into physical contact with the both surfaces of workpieces 14.
  • Cassette 12 is then rotated in relation to first and second discs 16, 18 and first and second lapping discs 16, 18 are provided with oscillatory motion.
  • the resulting motion causes workpieces 14 to circulate within opening 24, such that working surfaces 17, 19 of first and second lapping discs 16, 18, will be more evenly worn than is possibly using conventional lapping machines and lapping assembly 10 will provide even treatment to workpieces 14 on both sides'.
  • first lapping disc 16 can be lifted and finished workpieces 14 removed from lapping assembly 10.
  • lapping assembly 10 provides even treatment to both surfaces of a group of workpieces and effects even wear to the surfaces of lapping discs, 16 and 18,
  • Lapping assembly 10 allows a large number of workpieces 14 to be easily loaded and unloaded from opening 24 which results in a higher yield of treated workpieces 14.
  • lapping assembly 10 with first and second lapping discs 16, 18 and cassette 12 of diameter of approximately 300 millimetres can provide the same yield of treated workpieces 14 as a conventional socket-type planetary lapping machine with a diameter of 1500 millimetres.
  • lapping assembly 10 provides even treatment of all workpieces 14 positioned within an opening 24, due to the even circulation of workpieces 14 within cassette 12.
  • lapping assembly 10 does not use tooth-like elements, the typical wear and tear on conventional planetary lapping machines which utilize gears having teeth does not effect the lifetime of lapping assembly 10.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

Ensemble de rodage (10) destiné à roder un groupe de pièces à usiner (14) comprenant une paire de disques de rodage ainsi qu'une cassette (12) destinée à positionner les pièces à usiner entre les disques de rodage (16, 18). Les disques de rodage présentent des oscillations de translation à deux composantes à la vitesse de coupe appropriée, parallèles à leurs plans d'usinage. Ce mouvement est exécuté à l'aide de manetons de manivelle (21, 22) tournant autour d'un axe positionné coaxialement et d'éléments élastiques (20a, 20b) (ou éléments de support tournants) couplés au corps de la machine de rodage afin d'empêcher que les disques de rodage ne tournent. La cassette présente une ouverture ayant une forme curviligne destinée à maintenir les pièces à usiner, ainsi que des parties saillantes (26) s'étendant jusque dans l'ouverture. La cassette est montée sur un élément de support et est dotée d'un entraînement destiné à la faire tourner autour d'un axe fixe. Dans un autre mode de réalisation, la cassette peut être fixée pendant le traitement et les disques de rodage peuvent être mis en rotation à une vitesse inférieure à la vitesse de coupe. La combinaison de la forme curviligne de l'ouverture, des ouvertures ménagées dans la cassette et de la rotation relative de la cassette par rapport aux disques de rodage engendre une circulation des pièces à usiner à l'intérieur de l'ouverture d'une manière pseudo-aléatoire. L'appareil peut aussi être adapté pour finir des pièces à usiner de différentes hauteurs à l'aide d'un capteur (74) couplé à un disque de rodage (16) afin de détecter la proximité pré-établie de l'autre disque de rodage (18).
EP00964802A 1999-11-05 2000-06-26 Procede et appareil de rodage de pieces a usiner Withdrawn EP1230068A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CA 2288590 CA2288590C (fr) 1999-11-05 1999-11-05 Methode et appareil pour le dressage de pieces a travailler
CA2288590 1999-11-05
PCT/RU2000/000251 WO2001032361A1 (fr) 1999-11-05 2000-06-26 Procede et appareil de rodage de pieces a usiner

Publications (2)

Publication Number Publication Date
EP1230068A1 true EP1230068A1 (fr) 2002-08-14
EP1230068A4 EP1230068A4 (fr) 2004-05-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP00964802A Withdrawn EP1230068A4 (fr) 1999-11-05 2000-06-26 Procede et appareil de rodage de pieces a usiner

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Country Link
EP (1) EP1230068A4 (fr)
AU (1) AU7563400A (fr)
CA (1) CA2288590C (fr)
RU (1) RU2226147C2 (fr)
WO (1) WO2001032361A1 (fr)

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EP1230068A4 (fr) 2004-05-06
RU2226147C2 (ru) 2004-03-27
CA2288590A1 (fr) 2001-05-05
AU7563400A (en) 2001-05-14
CA2288590C (fr) 2005-01-25
WO2001032361A1 (fr) 2001-05-10

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