EP0226056A2 - Dispositif de pivotement de la poupée porte-pièce d'une rectifieuse, en particulier d'une rectifieuse cylindrique d'intérieur - Google Patents

Dispositif de pivotement de la poupée porte-pièce d'une rectifieuse, en particulier d'une rectifieuse cylindrique d'intérieur Download PDF

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Publication number
EP0226056A2
EP0226056A2 EP86115865A EP86115865A EP0226056A2 EP 0226056 A2 EP0226056 A2 EP 0226056A2 EP 86115865 A EP86115865 A EP 86115865A EP 86115865 A EP86115865 A EP 86115865A EP 0226056 A2 EP0226056 A2 EP 0226056A2
Authority
EP
European Patent Office
Prior art keywords
swivel
bearing
grinding machine
force
swivel plate
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Withdrawn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
EP86115865A
Other languages
German (de)
English (en)
Other versions
EP0226056A3 (fr
Inventor
Kurt Diesing
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.)
Werkzeugmaschinenkombinat 7 Oktober VEB
Original Assignee
Werkzeugmaschinenkombinat 7 Oktober VEB
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 Werkzeugmaschinenkombinat 7 Oktober VEB filed Critical Werkzeugmaschinenkombinat 7 Oktober VEB
Publication of EP0226056A2 publication Critical patent/EP0226056A2/fr
Publication of EP0226056A3 publication Critical patent/EP0226056A3/fr
Withdrawn legal-status Critical Current

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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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies
    • 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
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
    • B24B5/06—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces internally

Definitions

  • the invention relates to a swivel device for the workpiece headstock of a grinding machine, in particular an internal cylindrical grinding machine, for producing cylindrical and conical bores and for correcting these surfaces.
  • CNC or CAC-controlled grinding machines are being used to an ever greater extent for complex machining of workpieces with several bore diameters in one clamping.
  • a grinding machine is described with a workpiece headstock that is attached to a swivel unit.
  • the rotary movement for the swivel unit is carried out with the help of a servo motor, controlled by a programmable control.
  • the angle of rotation values are recorded by a position encoder and sent to the controller for processing.
  • two special clamping devices are provided. They are opened for positioning against the force of springs using a pressure medium. By means of a lubrication device, the friction between the swivel plate and the machine base plate is reduced during the rotation.
  • the workpiece headstock is fixed on the swivel unit and therefore not axially displaceable to the grinding wheel.
  • the machine is therefore only suitable for grinding short, ring-shaped workpieces.
  • the machining surface of the workpiece moves away from its starting position to such an extent that it can no longer be reached by the grinding wheel with reasonable cross slide paths.
  • the swivel plate has two lubrication systems. One consists of an annular channel with lubrication pockets concentrically arranged around the swivel bearing, to which lubricating oil is supplied.
  • the rotary shaft of the swivel bearing is fixed vertically by two angular ball bearings that are braced against each other, so that the swivel plate attached to the rotary shaft has an adapted space for the oil film to be formed in the vicinity of the swivel bearing relative to the machine base plate.
  • This gap is maintained by the tensioning of the angular contact ball bearings, even against the action of the clamping device. Due to this constant oil film, no ground contact is ensured in the clamped position in this area and a stick-slip effect cannot be ruled out in the smallest swiveling steps.
  • the other lubrication system at the end of the swivel plate consists of a channel system that is supplied with lubricating oil in the clamped position and additionally with compressed air during the swiveling movement.
  • the swivel plate will float on an oil film or air cushion.
  • this mounting has little stiffness.
  • the lubricating oil must be squeezed out of the sliding surfaces for clamping, which is also a hindrance to a safe ground contact.
  • the invention aims to remedy this situation and to develop a swivel unit on which an axially movable workpiece headstock can be placed for grinding long workpieces.
  • the invention v.ie it is characterized in the claims, solves the problem of designing the storage and clamping of the swivel unit so that, on the one hand, an attached workpiece headstock can be moved easily and that, on the other hand, a stick-slip effect even with swivel movements in the smallest steps.
  • a workpiece headstock with its functional assemblies is arranged to be longitudinally displaceable on longitudinal guides, so that the swivel unit often has a one-sided and variable load distribution by changing the center of gravity of the inertia force P 1, its working distance, for example from the swivel bearing.
  • the rotary actuator can be operated manually in cooperation with an electronic position indicator or by means of a servomotor with direct or indirect measuring systems.
  • the drive takes place either via traction means or gear elements, in that the output shaft of a reduction gear which can be adjusted for play drives either the drive pulley of a traction means or the pinion shaft of a gear drive.
  • the pinion engages in a toothed segment which is attached to a base plate.
  • the toothed segment is simultaneously designed as a thrust bearing segment acting on both sides. Via this axial bearing segment, two working pistons acted upon by pressure medium act as lifting or tensioning elements, depending on their pressurization.
  • a roller bearing axially preloaded by spring force for example a tapered roller bearing, serves as the pivot bearing.
  • the springs are arranged in such a way that they both maintain the axial preload force and, with their equally large reaction force P 2 'on the swivel plate, clamp it onto its base plate.
  • the cylinders are arranged and their forces are dimensioned such that the lift creates an equilibrium state, ie the remaining normal force approaches zero.
  • the clamping surface is coated with a sliding coating.
  • the two cylinders and the pivot bearing are arranged in such a way that their connecting lines form an isosceles or equilateral triangle with a statically determined arrangement and there is a state of equilibrium during the pivoting movement, but the rolling preload in the pivot bearing and the rolling clamping in the area of the lifting devices in cooperation with the rolling undergrip consisting of the toothed segment 15, the segment 19 and the roller bodies 20 arranged between them represent a rigid pivot bearing as a whole. If the leverage ratio distance a: distance b of the forces is changed by axially displacing the workpiece headstock on the longitudinal guide of the swivel plate to the right, the undergrip of the roller is more effective and the force acting there restores the equilibrium condition.
  • the swivel unit After positioning, the swivel unit is tightened by changing the pressure on the working pistons. As a result, the lifting force is switched off immediately.
  • the weight of the swivel unit is based on the clamping surface of the base plate.
  • a vertical downward clamping force is generated by the grip of the piston rods on the toothed segment.
  • the force component of the lifting force is also omitted on the pivot and the reaction force from the tapered roller bearing preload acts as the clamping force of the swivel unit on the lower plate.
  • a bearing bush 2 is centered and screwed in the base plate 1 according to FIG. 1, which could also be an adjustment slide.
  • the inner ring 3 of a tapered roller bearing is clamped on the bearing bush 2 by a nut 4.
  • the outer ring 5 of the tapered roller bearing is advantageously fitted into the bore 6 of the swivel plate 7 with a play of 0.01 to 0.02 mm.
  • a number of head bolts 8 are arranged in counterbores of the swivel plate 7 and fastened in the preload ring 9 in such a way that a preload is produced in the springs 10, the total preload force P 2 multiplied by the distance b is equal to the actual inertia force P 1 multiplied by the Distance a and that the sum of both forces, the inertia force P 1 and the pretensioning force P 2 , is equal to the lifting force A.
  • the preload force P 2 acts on the outer ring 5 via the preload ring 9, so that the tapered roller bearing is braced axially.
  • the bearing as a whole is inevitably radially preloaded via the tapered elements of the tapered roller bearing.
  • the springs 10 are supported on the base of the counterbores of the swivel plate 7, so that their reaction force P 2 clamps the swivel plate 7 on the base plate 1 in the same size.
  • An angle measuring system 11 is fixed in the swivel plate 7 centrally to the center of the swivel bearing, the shaft 12 of which is fixed in place via a torsionally rigid compensating coupling 13 and a pin 14.
  • a toothed segment 15 is furthermore fixed centrally on the lower plate 1 to the center of the pivot bearing.
  • a pinion shaft 16 is mounted in the swivel plate 7 and can be driven either manually or mechanically via a drive shaft 17.
  • the ten segment 15 simultaneously forms an axial roller bearing acting on both sides.
  • the segment 18 is held loosely to the swivel plate 7 with axial play.
  • the segment 19 is adapted as a rolling grip element and is firmly connected to the swivel plate 7 by screws 21.
  • the combined lifting and tensioning device essentially consists of a vertically guided, force-actuated tensioning rod 22, the lower end of which is designed as a throat.
  • the upper surface of the throat is supported by the segment 18 and the rolling elements 20 on the running surface of the toothed segment 15, as a result of which the swivel plate 7 is lifted off with the same counterforce.
  • the size of this lift-off is limited by the adjusted rolling grip of the segment 19, so that even with changed mass distribution on the swivel plate, the amount of the lift-off remains defined and the axial rolling bearing of the toothed segment 15 and the segments 18 and 19 is pre-tensioned. If the force actuation of the tension rod 22 is reversed, the lower surface of the throat engages under the toothed segment 15 and the counterforce presses the swivel plate onto the base plate 1.
  • FIG 3 three known drive variants for the swivel plate 7 are shown to complete the entire swivel device.
  • a servomotor 23 drives the pinion shaft 16 via a gear 24.
  • the same pinion shaft 16 ' can also be arranged at the front as a second variant and can be designed with a manual drive 25 for a manual swivel drive.
  • the drive elements are arranged in the swivel plate 7 and carry out the swivel movement while the pinions roll on the fixed tooth segment 15.
  • the third drive variant shows a swivel drive using a traction mechanism.
  • the gear 24 'of a second embodiment with a drive disk 26 for a traction means 27 is arranged on the base plate 1.
  • One run is articulated directly to a hinge point 28 of the swivel plate 7, while the second run is guided to the hinge point 28 via a deflection roller 29 of a resilient length compensation device 30.
  • the length compensation device 30 can, for. B. be a pressurized Gcradschubmotor, which ensures a constant force generation over the required balance stroke.
  • the two lifting and tensioning devices 31, 32 are arranged so that the connecting lines of their centers with each other and with the center of rotation of the pivot bearing 33 form an isosceles or equilateral triangle. This ensures a stable, statically determined situation both in swivel mode and in the clamping position. This means that the tilting moment resulting from the center of gravity 34 according to FIG. 4 lying relatively high above the swivel plane 35 and the acceleration is safely absorbed.
  • the arrangement of the lifting and tensioning devices 31, 32 has the task, in cooperation with the spring force acting in the pivot bearing and the load acting in the center of gravity 34, producing an equilibrium state in which the distances a and b and the lifting force A are the sum of the forces both working pistons are selected accordingly.
  • the result of this equilibrium state is that the normal force for a possibly remaining residual sliding friction is so low that there is no measurable sliding friction when interacting with a sliding surface coated with sliding foil.
  • Another effect of the slide film is that no lubricating oil is required and, consequently, it does not have to be displaced when the tension is applied. As a result, a safe ground contact is achieved in the tensioned state of the device.
  • a disturbance of the equilibrium condition by an adjustment of the workpiece headstock to the right is avoided in that the rolling grip of the element 19 is stressed more, whereby the equilibrium condition is restored.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Support Of The Bearing (AREA)
  • Machine Tool Units (AREA)
EP86115865A 1985-12-12 1986-11-14 Dispositif de pivotement de la poupée porte-pièce d'une rectifieuse, en particulier d'une rectifieuse cylindrique d'intérieur Withdrawn EP0226056A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DD284177 1985-12-12
DD28417785A DD243230B1 (de) 1985-12-12 1985-12-12 Schwenkeinrichtung fuer den werkstueckspindelkasten einer schleifmaschine, insbesondere innenrundschleifmaschine

Publications (2)

Publication Number Publication Date
EP0226056A2 true EP0226056A2 (fr) 1987-06-24
EP0226056A3 EP0226056A3 (fr) 1989-05-10

Family

ID=5574163

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86115865A Withdrawn EP0226056A3 (fr) 1985-12-12 1986-11-14 Dispositif de pivotement de la poupée porte-pièce d'une rectifieuse, en particulier d'une rectifieuse cylindrique d'intérieur

Country Status (3)

Country Link
EP (1) EP0226056A3 (fr)
JP (1) JPS62188635A (fr)
DD (1) DD243230B1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1279500B (de) * 1964-04-06 1968-10-03 Ulvsunda Verkstaeder Aktiebola Innenschleifvorrichtung fuer lange Bohrungen
US4513540A (en) * 1983-07-11 1985-04-30 Ex-Cell-O Corporation Grinding machine with CNC pivotable workhead

Also Published As

Publication number Publication date
DD243230B1 (de) 1988-06-29
DD243230A1 (de) 1987-02-25
EP0226056A3 (fr) 1989-05-10
JPS62188635A (ja) 1987-08-18

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Inventor name: DIESING, KURT