US3881378A - Machine for producing aspherical surfaces - Google Patents

Machine for producing aspherical surfaces Download PDF

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Publication number
US3881378A
US3881378A US427447A US42744773A US3881378A US 3881378 A US3881378 A US 3881378A US 427447 A US427447 A US 427447A US 42744773 A US42744773 A US 42744773A US 3881378 A US3881378 A US 3881378A
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Prior art keywords
machine
axis
aspherical surfaces
spindle
surfaces according
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US427447A
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English (en)
Inventor
Bruno P Bettiol
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EssilorLuxottica SA
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Essilor International Compagnie Generale dOptique SA
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    • 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
    • B23Q35/00—Control systems or devices for copying directly from a pattern or a master model; Devices for use in copying manually
    • B23Q35/04—Control systems or devices for copying directly from a pattern or a master model; Devices for use in copying manually using a feeler or the like travelling along the outline of the pattern, model or drawing; Feelers, patterns, or models therefor
    • B23Q35/42—Patterns; Masters models
    • B23Q35/44—Patterns; Masters models provided with means for adjusting the contact face, e.g. comprising flexible bands held by set-screws
    • 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
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/0032—Arrangements for preventing or isolating vibrations in parts of the machine
    • 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
    • B23Q35/00—Control systems or devices for copying directly from a pattern or a master model; Devices for use in copying manually
    • B23Q35/04—Control systems or devices for copying directly from a pattern or a master model; Devices for use in copying manually using a feeler or the like travelling along the outline of the pattern, model or drawing; Feelers, patterns, or models therefor
    • B23Q35/08—Means for transforming movement of the feeler or the like into feed movement of tool or work
    • B23Q35/10—Means for transforming movement of the feeler or the like into feed movement of tool or work mechanically only
    • B23Q35/101—Means for transforming movement of the feeler or the like into feed movement of tool or work mechanically only with a pattern composed of one or more lines used simultaneously for one tool
    • B23Q35/102—Means for transforming movement of the feeler or the like into feed movement of tool or work mechanically only with a pattern composed of one or more lines used simultaneously for one tool of one line
    • 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
    • B23Q35/00—Control systems or devices for copying directly from a pattern or a master model; Devices for use in copying manually
    • B23Q35/04—Control systems or devices for copying directly from a pattern or a master model; Devices for use in copying manually using a feeler or the like travelling along the outline of the pattern, model or drawing; Feelers, patterns, or models therefor
    • B23Q35/08—Means for transforming movement of the feeler or the like into feed movement of tool or work
    • B23Q35/20—Means for transforming movement of the feeler or the like into feed movement of tool or work with special means for varying the ratio of reproduction
    • 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
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/06—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor grinding of lenses, the tool or work being controlled by information-carrying means, e.g. patterns, punched tapes, magnetic tapes
    • B24B13/065—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor grinding of lenses, the tool or work being controlled by information-carrying means, e.g. patterns, punched tapes, magnetic tapes using a template
    • 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
    • Y10T82/00—Turning
    • Y10T82/13—Pattern section
    • Y10T82/135—Cam-controlled cutter
    • 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
    • Y10T82/00—Turning
    • Y10T82/14—Axial pattern
    • Y10T82/148—Pivoted tool rest

Definitions

  • ABSTRACT A machine for producing concave or convex aspherical surfaces, comprises a blank carrier spindle mounted for rotation about a first axis, a cutting tool mounted for travelling movement in the direction of the second axis and pivotable about a third axis perpendicular to the first two axes, a control cam, and drive means controlled by the said cam and adapted to displace the said cutting tool, in response to the cam, along its travelling axis between two positions, one of which is an advance position and the other a withdrawn position and either of which is a cutting position and the other a position of rest, the axis of rotation of the spindle and the axis of movement of the tool passing through the centre of the aspherical surface to be cut, and wherein the blank carrier spindle is adjustable in a stable axial position in a spindle support, the control cam is fixed, and the cutting tool is carried by a shoe displaceable on a
  • SHEET 10F 5 FIG] PATEMED HAY 6 ms SHEET 3 BF 5 MACHINE FOR PRODUCING ASPHERICAL SURFACES BACKGROUND OF THE INVENTION
  • the present invention relates to a machine for producing concave or convex aspherical surfaces.
  • Machines of the kind in question are undoubtedly already known in which a blank is driven rotationally by means of a rotating chuck, and in which a cutting tool carried by a tool carrier is driven in a travelling movement with the aid of mechanical means, such as a control cam.
  • the surface quality obtained must be such that no defect occurs which would be transmitted to the resulting product.
  • Machines known at the present time for producing such surfaces do not give complete satisfaction. particularly in respect of precision. ease of modification of the profile to be machined. and rate of production.
  • the present invention relates to a machine intended to overcome the various disadvantages briefly recalled above.
  • the machine for producing concave or convex aspherical surfaces comprises a blank carrier spindle mounted for rotation about a first axis, a cutting tool mounted for travelling movement along a second axis and pivotable about a third axis perpendicular to the first two axes. a control cam, and drive means controlled by the said cam and adapted, through the action of the latter, to displace the said cutting tool along its travelling axis between an advanced cutting position and a withdrawn position of rest.
  • the blank carrier spindle is adjustable in a stable axial position in a spindle support
  • the control cam is fixed
  • the cutting tool is carried by a shoe which is displaceable on a rotating turret.
  • the drive means being disposed between the said shoe and the said fixed control cam.
  • the blank carrier spindle is provided at one end with z chuck intended to carry the blank, while at its other end it cooperates with damping means, the said chuck being provided internally with at least two pairs 0: contact points for a blank carrier and a means of apply ing the latter against these points.
  • the spindle support is adjustable at will horizontally anc vertically, the said support being disposed on the to; surface of a base comprising two superimposed parts joined together, the top part carrying means for adjust ing the position of the said spindle carrier, while the bottom part has an extension adapted to receive the rotary turret which has a central pivot fastened to a base on which the aforesaid movable shoe can be displaced
  • the spindle support rests naturally on a support plate provided on the top portion of the two-part base, by three support points constituting the apices of a triangle, the said top portion of the base having a box-like structure ballasted with concrete.
  • the spindle support is positioned horizontally by three lateral contact points. one of these points being disposed in the middle of a lateral support face with the interposition of an elastic means, while the other two points are disposed towards the terminal portions of the other lateral face, a second point being formed by a first pillar with the interposition of a pivoting element. while the third. so-called thrust point constitutes the actual adjustment means, while with regard to vertical adjustment this is effected by three screws having a vertical axis, which are associated with the bottom portion of the base and cooperate with a support frame. these screws being so disposed as to form the apices of a triangle.
  • the thrust point is fastened to a lever adapted to oscillate on a vertical axis with the aid of an orientation screw acting on the said lever, which in turn is subjected to the action of an elastic means placed between the said lever and the lateral face of the spindle support, the pivoting point being close to the orientation screw while the thrust point and the orientation screw are close to one another.
  • the drive means of the movable shoe which are disposed between the latter and the fixed control cam.
  • a lever arm extending substantially in a vertical direction and mounted for rocking;
  • a lever arm of this kind is adapted to cooperate by its bottom portion with the fixed cam, which advantageously has a variable profile, and it is so equipped as to permit, in conjunction with the cam, the production of concave or convex profiles simply by changing the position of a micrometer mechanism which is associated with it, this mechanism being adapted to cooperate by one end with one or the other of two elements which are de tachably fixed to the movable shoe carrying the too! carrier, the said elements being offset in height one or each side of the axis of rotation of the lever arm and also being spaced longitudinally.
  • the lever arm cooperates with the aforesaid cam with the aid of a follower which is adjustable at will, in such a manner that depending on the position of this follower it is possible tc vary the desired profile. and this can be done on each side of a common trunk, thus avoiding the dismantling of the cam.
  • the cam of variable profile is fixed and is automatically positioned on the machine when it is placed in position, thus making it possible, after suitable adjustment, to obtain parts having convex or concave aspherical surfaces.
  • the adjustment of the desired cam profile is advantageously effected outside the machine by means of an arrangement which comprises, on a support, a frame pivoting about an axis and carrying on the one hand a follower adapted to cooperate with the cam and, on the other hand, a pointer adapted to move past a graduated sector on the support.
  • FIG. I is a partial view in perspective of the machine according to the invention.
  • FIG. 2 is a view in side elevation
  • FIG. 3 is a corresponding plan view
  • FIG. 4 shows in elevation a support point of the base on the frame
  • FIG. 5 shows on a larger scale, in a plan view, the assembly comprising the blank carrier with its adjustment and damping means;
  • FIG. 6 is a view in section on the line VIVI in FIG. 4;
  • FIG. 7 is a view partly in section of an alternative form of the aforesaid damping device
  • FIG. 8 is a view on a larger scale, in side elevation, of the tool carrier, the tool carrier turret being shown only diagrammatically in dot-and-dash lines;
  • FIG. 9 is a corresponding front view in the direction of the arrow IX in FIG. 8;
  • FIG. 10 is a plan view in the direction of the arrow X in FIG. 8;
  • FIG. 11 shows in perspective the support of the work carrier spindle
  • FIG. 12 is a plan view showing a cam of variable profile and also the means of adjusting its profile
  • FIG. 13 is a section on the line XIIXII in FIG. 12, and
  • FIG. 14 shows in elevation, partly broken away, one form of the workpieces obtained.
  • the machine according to the invention for producing aspherical surfaces comprises essentially, on a rigid frame 10, a base 11 which on the one hand carries a spindle support 12 extending horizontally along an axis XX, and on the other hand a tool carrier turret 14 mounted for pivoting about an axis Y-Y with the aid of a central pivot 15.
  • axes X-X and Y-Y respectively are perpendicular to one another and concurrent. and the displacements of the actual tool are controlled by means of a fixed cam 16.
  • the frame 10 is made of sections welded with lacing (not visible in the drawings) in order to increase its rigidity. It rests on the ground with the aid of four rigid supporting feet.
  • the frame 10 is entirely closed and is intended to support the base 11 and to accommodate accessory devices, such as hydraulic pumps, liquid and lubricant tanks, compressed air and oil mist production circuit, etc.
  • the base 11 rests on the frame 10 by means of three support points (FIG. 3), each of which is given the general designation 20, 21 and 22 which form the apices of a triangle.
  • the top surface of the frame 10 has a covering of material 23, such as suitable rubber, on which rests a ground washer 24 whose free surface is intended to cooperate with the end of a threaded rod 25 screwing into a bracket 26 rigidly fastened to the central body.
  • a covering of material 23 such as suitable rubber
  • the screw 25 has a head 27 provided with radial holes 28, while a lock-nut 29 effects the locking of the screw 25.
  • the base 11 is composed of a welded sheet steel structure which comprises a first lower portion Ila to which is attached a second upper portion 11b intended to support the spindle carrier 12 and also the damping device 13.
  • the bottom portion (see in particular FIG. 3) has an extension Il'a intended to support the tool carrier turret l4 and its central pivot 15.
  • the base 11 rests naturally on the frame 10 and the damping of vibrations which may occur in the course of the machining of the blank is effected (FIG. 2) by concrete 30 poured into compartments of the structure of the base 11; apertures 31 are naturally provided in the base 11 for the passage of the drive elements which will be described later on.
  • the portion 11b of the base is provided with a ground plate 32.
  • FIGS. 5 to 8 show in greater detail the support 12 of the spindle, together with its fastening means.
  • the aforesaid spindle support (see also FIG. 11) comprises essentially two casing halves 40 and 41 each of which has a semi-circular axial cutout 42, 43 respectively.
  • the lower casing half 40 is intended to rest on the ground plate 32 and to be held there by a means which will be described in greater detail later on.
  • the semi-circular bores 42, 43 are adapted to receive without play a spindle carrier 45, which is advantageously of the hydrodynamic type and in which is axially movable a spindle 46 whose so-called front end 46A receives a chuck, which is indicated generally by 47, and a so-called rear end 468 carries a drive pulley 50.
  • a spindle carrier 45 which is advantageously of the hydrodynamic type and in which is axially movable a spindle 46 whose so-called front end 46A receives a chuck, which is indicated generally by 47, and a so-called rear end 468 carries a drive pulley 50.
  • the aforesaid drive pulley is coupled to an electric motor, which is for example fastened on the lower face of the frame 11.
  • the chuck 47 which is fastened to the front part of the spindle 46, is provided with means for holding the blank which is to be machined. this blank being indicated at E in FIGS. 2 and 3.
  • the chuck 47 is provided internally with two pairs of support points 55, 56 and 57, 58, which are offset longitudinally, and a radial orientation pressure screw 59 intended to apply the tail of the blank E against the aforesaid points.
  • the support points of each pair have a radial orientation (FIG. 6); they are advantageously offset in a transversal plane at 120 to one another. while the radial pressure screw 59 is disposed in the middle of the remaining portion of the circumference.
  • the support of the spindle carrier 12 rests naturally on the ground plate 32 and that its lower portion cooperates with positioning means which are disposed laterally and which, as can be clearly seen particularly in FIG. 5, comprise a first fixed pillar disposed in the middle of one side of the spindle support. and a second pillar 61 disposed on the other side and one towards an apex.
  • the pillar 60 In its lower portion situated opposite the lower portion of the support of the spindle 40 the pillar 60 has a recess for a compression spring 64, whose free end is intended to cooperate with the said part 40.
  • the lower portion 40 of the spindle support On its opposite side (FIG. 11), that is to say on the side of the pillar 61, the lower portion 40 of the spindle support has two recesses and 71 respectively; one of them (70) is intended to receive a pivot 72 having a substantially semicylindrical sector 73, while the other (71) is intended to receive a ground support element 74.
  • the pillar 61 is equipped with a depression 75 in which a portion of the semicylindrical sector 73 is at least partly supported.
  • a third contact point is formed on the same side as the pillar 61 by a sector associated with a lever 81 substantially parallel to the side of the support 12;
  • the lever 81 is mounted for rocking in a horizontal plane by means of a pin 82 disposed beyond the aforesaid sector 80 and by means of an operating screw situated at the other end of the lever 81, near the pillar 61;
  • the screw 83 is screwed into a tapping in a fixed part 85 and bears against the lever 81, while a spring 87 interposed between the lower portion 40 of the support 12 and the aforesaid lever urges the latter towards the outside in the direction of the arrow F, that is to say into contact with the end of the screw 83.
  • Adjustability of the orientation of the axis XX, and consequently of the support of the spindle and of the blank, is thus obtained. and this adjustment can be extremely accurate, particularly because of the reduction ratio obtained by means of the lever 81 and the sector 80.
  • the spindle 46 is free to slide in the spindle carrier 45 and its axial position is determined by means adapted to effect micrometer adjustment of the advance of the blank and, furthermore, permits the retraction of the latter if the tool support force exceeds a predetermined threshold.
  • Damping means which will now be described with reference to FIG. 5, are in addition provided in order to avoid return shocks.
  • the rear end face of the spindle 46 has a notch 90 intended to receive a ball 91 while the front face 92 of the damping device 13 is likewise adapted to cooperate with the ball 91.
  • magnets 48 are fixed on the mutually opposite faces of these elements (FIG. 5).
  • This damping device comprises a central body 93 situated in alignment with the spindle 46 and adapted to slide in the direction of the arrow F2 on the ground plate 32 by means of a slide arrangement, which is not shown in the drawings because it is known per se.
  • the front portion 92 can be displaced longitudinally by means of a graduated disc 94 and it acts directly on the end of the spindle 46. A first axial adjustment of the spindle is therefore obtained in this manner.
  • the central damper body 93 is disposed between two pillars and 101 fixed on the plate 32, and towards the rear it has lateral extensions 103 and 104.
  • a damping jack designated generally 105 whose barrel is for example fastened to the pillar 100, while the piston head is attached to the extension 103; in parallel, a spring 107 is attached by each of its ends to the pillar 100 and to the extension 103.
  • the pillar 101 On the other side the pillar 101 carries a micrometer mechanism 110 having an end 11] adapted to cooperate with a ball 112 interposed between a support plate 113 fixed on the extension 104, and another operating end 114.
  • the damping device comprises a hollow body in which a piston 121 forms two chambers 122 and 123.
  • a threaded piston rod 124 passes through the chamber 122 and receives a ring 128 which is adapted to slide axially and is locked in respect of rotation by means of a slot 129 and a radial screw 130 cooperating with the said slot.
  • a ball thrust bearing 131 is provided between one face of a graduated disc 132 associated with the aforesaid screw 124 and the corresponding face of the spindle 46.
  • the piston 121 On its other face the piston 121 is subjected in the chamber 123 to the action of a spring 135 effecting adjustment from outside by means of a screw 136.
  • the central body has an extension 138 which is in communication through a conventional non-leakproof ball valve 139 and a calibrated passage 140 with the chamber 123 in which the piston 121 moves.
  • the tool carrier turret 14 (FIGS. 1 and 2 in particular) is mounted on the central pivot 15 resting by means of a roller bearing (not shown in the drawings) on the extension 11'A; this central pivot 15 is rotated by means of a motor 151 and transmissions 152. 153 which are carried by the lower face of the frame and drive a shaft 154 fastened on the central pivot 15.
  • the motor 151 is of the variable speed type rotating in two directions.
  • the central pivot carries a base 160 on which by means of a slide known per se a shoe 161 is adapted to slide, this shoe being equipped with splined coupling means 162 intended to receive a corresponding portion 163 of a tool carrier 164.
  • the base 160 On its front side the base 160 carries bearings 170, 171 (see in particular FIGS. 8 to 10); these bearings carry shafts 172 and 173 whose free terminal portions are engaged in lugs 175 and 176 fastened to a lever arm I77 extending vertically.
  • the lever arm is therefore adapted to rock about horizontal axes 172, 173.
  • rocking movements are controlled by means of the cam 16 which will be described in greater detail later on, and by means of a follower 181 disposed at the bottom part of the arm 177; in order to keep the follower 181 applied against the outer face 222 of the cam 16 there is provided a spring 190 which is attached by one end to the lever 177 and by the other end to a fixed point 191 of the base 160.
  • Each of the free ends of the rods has a tip 204 which is eccentric in relation to the axis of the said rod. and punctiform contact is thus obtained between the end of the mechanism 200 and a corresponding end of the rods 202 and 203, which in addition are adjustable longitudinally; this adjustment is obtained by rotating the rods 202, 203 and through the resulting displacement of the point of contact of the tip 204 with the mechanism 200. Extremely accurate adjustment of the reduction ratio can thus be achieved.
  • the mechanism 200 can therefore be disposed in such a manner as to cooperate either with the rod 202 or with the rod 203; for this purpose the lever arm 177 has judiciously disposed bores 205 and 206, either of which can be used depending on circumstances. while these screws 207. 208 are intended to effect the locking of this mechanism.
  • a spring 183 is provided which is attached to the base 160 at one end and to the shoe 161 at the other end.
  • the follower 181 (FIG. 8) is fastened to a plate 210 having a horizontal orientation aperture 211, while a screw 212 engaged in the aperture is fixed to the lever arm 177 and permits the possible horizontal displacement of the plate 210 and its associated follower.
  • An arrangement of this kind has essentially the aim of permitting the production of different profiles from a common central trunk.
  • FIGS. 12 and. 13 show the variable profile cam given the general reference 16.
  • the cam in question comprises a plate 216 having the general shape of an arc of a circle; this plate is notched at 217 so as to receive the cam comprising a blade or strip 218 of steel or other deformable material, the notch forming a heel 219 for a plurality of adjustment means.
  • which in the example illustrated comprise screws 220. These screws have one end intended to cooperate with a rear face 221 of the blade, while the front face 222 of the latter cooperates with the follower 181 of the lever arm 177.
  • the back face of the blade is advantageously provided with a layer 223 of suitable material, such as metallic, elastic, or plastics material, which may have either a continuous or a discontinuous structure.
  • a layer of this kind is in particular intended to eliminate discontinuities due both to the tension of the tape which is necessary to obtain good rigidity of the cam, and to the distance between the screws 222.
  • a plate 225 on which is adapted to pivot, about an axis 226, a frame 227 carrying a pointer 228 controlling a comparator 229, this index being adapted to cooperate with the front face 222 of the blade 218.
  • the plate 225 also carries stops 240 permitting the fastening of the cam support, the relative arrangement of these stops corresponding to that of similar stops on the frame of the machine, as will be seen later on.
  • the plate 225 also has graduations 232 opposite which a pointer 233 fastened on the shaft 226 can move.
  • the cam When the cam is adjusted in accordance with the selected profile, it is placed on the top part of the frame, which for this purpose (see in particular FIG. 3) has a centring system comprising four points 250, 251, 252, 253 corresponding to the previously mentioned stops 240, so that its positioning automatically corresponds to the position of symmetry of the axis of rotation YY of the central pivot and the axis of rotation X-X of the spindle.
  • variable profile cam of the kind described provides the not negligible advantage of offering numerous adjustabilities, for example in order to eliminate any deformation of the product which may be caused by certain phases of the production cycle.
  • variable profile cams can be used in any reproduction machines. such as optical machines for producing aspherical surfaces. or else in any machines for mechanical engineering or any other applications.
  • a sphere is produced and, after verification (with i the aid of usual means), the axis of the cutting tool is made to coincide with the axis of rotation f the spindle 46;
  • the fixed cam 16 is then adjusted in accordance with the desired profile of the workpiece, with the aid of the cam adjustment apparatus;
  • the blank is cut with a suitable wheel
  • a machine for producing concave or convex aspherical surfaces comprising a frame, a spindle, support means carried on the frame for mounting said spindle for rotation about its axis, a blank carrier. means for supporting said blank carrier on said spindle, a cutting tool, first mounting means for mounting the cutting tool for travelling movement along a second axis, second mounting means for mounting the cutting tool for rotation about a third axis substantially perpendicular to said axis of the spindle and said second axis, a fixed control cam fastened to said frame, drive means controlled by said control cam and coacting with said first mounting means to effect the displacement of the cutting tool along a path of movement for cutting the aspherical surface, and first adjustment means for adjusting the orientation of said axis of the spindle in a plane substantially perpendicular to said third axis so that said axis of rotation of the spindle may be brought into precise coincidence with said path of movement of the cutting tool at the center of the aspherical surface to be cut.
  • a machine for producing aspherical surfaces wherein said frame includes a base at the top thereof, and further comprising second adjustment means for adjusting the orientation of the base relative to the rest of the frame so that the base and therefore the said plane may be adjusted to a precisely horizontal position.
  • a machine for producing aspherical surfaces wherein the means for supporting the blank carrier on said spindle is a chuck including at least two pairs of contact members extending radially into engagement with the blank carrier, and securing means for maintaining the contact members in engagement with the blank carrier disposed axially between the two pairs of contact members and opposite thereto.
  • said second mounting means includes a base plate secured for rotation on a turret
  • said first mounting means includes a slide mounted for reciprocating displacement on said base plate in response to said control cam.
  • said first adjustment means includes three support points in contact with the support means for said spindle, one said point being defined by resilient means in contact in the middle of one side of said support means substantially parallel to the axis of the said spindle, the two other points being defined by a pivot and by a thrust point that contact said support means near the ends of a side of said support means opposite said one side.
  • a machine for producing aspherical surfaces wherein said thrust point is disposed on a lever mounted for rocking movement about a substantially vertical axis, an orientation screw engaging the lever remote from said thrust point and adjacent to said pivot and resilient means disposed axially between said thrust point and said orientation screw and operating between the support means and said lever.
  • said central body having, on each side of its longitudinal axis, means for adjusting the axial position of the central body and means for maintaining the central body in a desired stable position, said last mentioned means being constituted by a traction spring operatively attached between a fixed pillar and said central body and a damping pot in parallel with said traction spring compensating for additional traction forces during machinmg.
  • said drive means includes a lever arm substantially vertically oriented and pivotally mounted about a substantially horizontal axis and in point contact at its upper end with said slide and in contact at its lower end with said control cam.
  • a machine for producing aspherical surfaces wherein said point contact between the lever arm and the slide is effected by a micrometric mechanism carried by said lever arm and having an axially displaceable end in contact with a tip of an element associated with said base.
  • a machine for producing aspherical surfaces wherein said base carries a pair of elements having tips spaced along the pivot axis of said lever arm at different distances therefrom and offset, said micrometric mechanism being detachably mounted on said lever arm.
  • each of said pair of elements comprises a rod rotatable about its axis and terminating in a tip eccentric to its axis.
  • control cam comprises a deformable strip fixed at its ends to a removable plate, and a plurality of adjusting elements displaceable parallel to the plane of the said plate and therefore perpendicular to the strip for obtaining the desired shape of the strip.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Turning (AREA)
US427447A 1972-12-29 1973-12-26 Machine for producing aspherical surfaces Expired - Lifetime US3881378A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7246934A FR2212772A5 (zh) 1972-12-29 1972-12-29

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US (1) US3881378A (zh)
JP (3) JPS49124679A (zh)
AU (1) AU468886B2 (zh)
CA (1) CA1014381A (zh)
CS (1) CS181736B2 (zh)
DE (1) DE2365084C3 (zh)
FR (1) FR2212772A5 (zh)
GB (1) GB1450710A (zh)
IT (1) IT1002331B (zh)

Cited By (13)

* Cited by examiner, † Cited by third party
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US3977279A (en) * 1975-04-16 1976-08-31 Derrell C. Hooker Lathe for generating spherical or aspherical surfaces on workpieces
US4083272A (en) * 1976-12-14 1978-04-11 The United States Of America As Represented By The United States Department Of Energy Omega-X micromachining system
US4114486A (en) * 1975-04-16 1978-09-19 Aspheric Associates, Ltd. Lathe for generating spherical or aspherical surfaces on workpieces, method for generating aspherical surfaces on workpieces and workpiece having aspherical surface
US4333368A (en) * 1980-07-15 1982-06-08 Kollmorgen Technologies Corporation Method and apparatus for generating aspherical surfaces of revolution
US4592684A (en) * 1982-03-22 1986-06-03 Sira Limited Method and apparatus for producing aspherical surfaces
US4995300A (en) * 1989-04-28 1991-02-26 Chariot Star, Inc. Lathe for generating aspherical surfaces on work pieces
US5067284A (en) * 1988-09-12 1991-11-26 Ex-Cell-O Gmbh Machine tool
EP1719573A1 (de) * 2005-05-06 2006-11-08 Satisloh GmbH Drehmaschine mit einem einstückigen Gestell aus Polymerbeton
US20060259317A1 (en) * 2005-05-12 2006-11-16 Canon Kabushiki Kaisha Apparatus, method, and program for managing network instrument connected to network
CN100496822C (zh) * 2006-12-25 2009-06-10 江苏万工科技集团有限公司 加工内孔油槽的专用夹具
CN102554269A (zh) * 2012-01-19 2012-07-11 沈阳第一机床厂 一种机床车磨中心
CN106670817A (zh) * 2017-02-14 2017-05-17 侯如升 一种机械零件精加工装置
CN109333075A (zh) * 2018-11-26 2019-02-15 台州多凯工业设计有限公司 一种具有减震效果的机床移动底座

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FR2267493B1 (zh) * 1974-04-11 1976-12-17 Essilor Int
FR2354165A1 (fr) * 1976-06-11 1978-01-06 Gulf Western Invention Develop Machine a engendrer des surfaces spheriques ou aspheriques sur des pieces
JPS591147A (ja) * 1982-06-29 1984-01-06 Hitachi Ltd 自動磨き装置
JPS59148939U (ja) * 1983-03-25 1984-10-04 川崎重工業株式会社 ごみ焼却炉における焼却灰湿式排出装置
GB8325027D0 (en) * 1983-09-19 1983-10-19 Robertson Eng Thame Ltd Aspheric cutting lathe
DE3523013A1 (de) * 1985-06-27 1987-01-02 Schaudt Maschinenbau Gmbh Schleifmaschine
EP0440578A1 (de) * 1990-01-24 1991-08-07 Ciba-Geigy Ag Vorrichtung zur Herstellung einer Formgebungsfläche an einem Formwerkzeug für die Fertigung optischer und ophthalmischer Linsen
DE102004041117A1 (de) * 2004-08-24 2006-03-02 Nyffenegger, Ulrich Verfahren und Vorrichtung zum Schleifen eines Profils eines Werkstücks
KR20160137549A (ko) 2014-03-26 2016-11-30 섀플러 테크놀로지스 아게 운트 코. 카게 자동차 변속 장치의 기어단의 선택 및 시프팅을 위한 게이트를 갖는 단일 모터 변속기 액추에이터
CN106541327B (zh) * 2016-12-07 2018-07-24 广东天机工业智能系统有限公司 抛光机

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US1513883A (en) * 1921-05-14 1924-11-04 Bausch & Lomb Machine for forming lens-grinding tools
US2423941A (en) * 1944-03-06 1947-07-15 Eugene W Laisne Metalworking machine
US2539941A (en) * 1945-12-07 1951-01-30 Allen Reginald Forming and cutting tool
US2725776A (en) * 1949-05-24 1955-12-06 Hopkins Alan Lathe attachments
US3079732A (en) * 1959-02-18 1963-03-05 Rank Precision Ind Ltd Generation of aspheric surfaces
US3106857A (en) * 1960-05-27 1963-10-15 Lockheed Aircraft Corp Machining and tracing apparatus
US3139083A (en) * 1960-02-19 1964-06-30 Cincinnati Milling Machine Co Machine tool contouring mechanism
US3212371A (en) * 1962-06-26 1965-10-19 Donald W Banke Cam-operated turning, boring and facing attachment for lathes
US3744357A (en) * 1971-09-27 1973-07-10 Anderson Cook Inc Profile cutting tool

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GB587768A (en) * 1945-01-17 1947-05-05 Cooke Troughton & Simms Ltd Improved means for grinding polishing or similarly treating surfaces of aspherical form
US2553528A (en) * 1947-06-05 1951-05-15 D Avaucourt Pierre De Vitry Surfacing machine for producing lenses and similar articles

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1513883A (en) * 1921-05-14 1924-11-04 Bausch & Lomb Machine for forming lens-grinding tools
US2423941A (en) * 1944-03-06 1947-07-15 Eugene W Laisne Metalworking machine
US2539941A (en) * 1945-12-07 1951-01-30 Allen Reginald Forming and cutting tool
US2725776A (en) * 1949-05-24 1955-12-06 Hopkins Alan Lathe attachments
US3079732A (en) * 1959-02-18 1963-03-05 Rank Precision Ind Ltd Generation of aspheric surfaces
US3139083A (en) * 1960-02-19 1964-06-30 Cincinnati Milling Machine Co Machine tool contouring mechanism
US3106857A (en) * 1960-05-27 1963-10-15 Lockheed Aircraft Corp Machining and tracing apparatus
US3212371A (en) * 1962-06-26 1965-10-19 Donald W Banke Cam-operated turning, boring and facing attachment for lathes
US3744357A (en) * 1971-09-27 1973-07-10 Anderson Cook Inc Profile cutting tool

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3977279A (en) * 1975-04-16 1976-08-31 Derrell C. Hooker Lathe for generating spherical or aspherical surfaces on workpieces
US4114486A (en) * 1975-04-16 1978-09-19 Aspheric Associates, Ltd. Lathe for generating spherical or aspherical surfaces on workpieces, method for generating aspherical surfaces on workpieces and workpiece having aspherical surface
US4083272A (en) * 1976-12-14 1978-04-11 The United States Of America As Represented By The United States Department Of Energy Omega-X micromachining system
US4141150A (en) * 1976-12-14 1979-02-27 The United States Of America As Represented By The United States Department Of Energy Gage for micromachining system
US4333368A (en) * 1980-07-15 1982-06-08 Kollmorgen Technologies Corporation Method and apparatus for generating aspherical surfaces of revolution
US4592684A (en) * 1982-03-22 1986-06-03 Sira Limited Method and apparatus for producing aspherical surfaces
US5067284A (en) * 1988-09-12 1991-11-26 Ex-Cell-O Gmbh Machine tool
US4995300A (en) * 1989-04-28 1991-02-26 Chariot Star, Inc. Lathe for generating aspherical surfaces on work pieces
EP1719573A1 (de) * 2005-05-06 2006-11-08 Satisloh GmbH Drehmaschine mit einem einstückigen Gestell aus Polymerbeton
US20060248697A1 (en) * 2005-05-06 2006-11-09 Holger Schaefer Lathe for machining optical workpieces
US7278192B2 (en) 2005-05-06 2007-10-09 Satisloh Gmbh Lathe for machining optical workpieces
US20060259317A1 (en) * 2005-05-12 2006-11-16 Canon Kabushiki Kaisha Apparatus, method, and program for managing network instrument connected to network
CN100496822C (zh) * 2006-12-25 2009-06-10 江苏万工科技集团有限公司 加工内孔油槽的专用夹具
CN102554269A (zh) * 2012-01-19 2012-07-11 沈阳第一机床厂 一种机床车磨中心
CN106670817A (zh) * 2017-02-14 2017-05-17 侯如升 一种机械零件精加工装置
CN109333075A (zh) * 2018-11-26 2019-02-15 台州多凯工业设计有限公司 一种具有减震效果的机床移动底座

Also Published As

Publication number Publication date
GB1450710A (en) 1976-09-29
JPS49124679A (zh) 1974-11-28
JPS557700U (zh) 1980-01-18
JPS54161181A (en) 1979-12-20
DE2365084C3 (de) 1981-10-29
AU6459374A (en) 1975-07-17
DE2365084A1 (de) 1974-08-08
CS181736B2 (en) 1978-03-31
JPS5850823B2 (ja) 1983-11-12
FR2212772A5 (zh) 1974-07-26
IT1002331B (it) 1976-05-20
AU468886B2 (en) 1976-01-29
CA1014381A (fr) 1977-07-26
DE2365084B2 (de) 1981-03-12

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