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
  • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
  • B24B53/04—Devices or means for dressing or conditioning abrasive surfaces of cylindrical or conical surfaces on abrasive tools or wheels
  • B24B53/053—Devices or means for dressing or conditioning abrasive surfaces of cylindrical or conical surfaces on abrasive tools or wheels using a rotary dressing tool

Definitions

• the present invention relates, on the one hand, to a method for dressing grinding wheels, advantageously by means of a diamond dressing wheel, on grinding machines, according to the preamble of patent claim 1.
• the invention relates to a device for carrying out the method.
• the grinding process or processes are carried out on a grinding machine, in which the workpiece to be ground is on a rotary table located on the longitudinal slide between the headstock and tailstock is spanned.
• the longitudinal slide is displaceable on the longitudinal axis (Z-axis) of the grinding machine 'and the rotary table can be additionally compared to the longitudinal slide about a vertical axis (B-axis) machine twist the Schleifma ⁇ , such that the at the at by The headstock and the tailstock-defined axis (C-axis) clamped and rotatable workpiece can be positioned three-dimensionally relative to the grinding wheel which can be rotated about its axis of rotation (A-axis) and displaceable on a further axis (X-axis).
• the dressing wheel for the grinding wheel is mounted on the turntable in such a way that it can advantageously be rotated about the aforementioned C axis, about which the workpiece to be ground rotates. Since the C-axis can be rotated out of the longitudinal axis (Z-axis) of the grinding machine by rotating the movable slide and thus the C-axis about said B-axis, the grinding line between the grinding wheel and the dressing wheel can be positioned anywhere in the room.
• the grinding wheel / workpiece cannot be calculated, or at least not directly in every case, and the grinding machine must be reset to zero after each dressing process in order to precisely determine the new position of the grinding wheel / workpiece grinding line.
• the position of the dressing wheel which usually remains mounted on the rotary slide during the grinding of a workpiece, is changed by each rotation of the rotary slide, or. also twisted by zeroing the C axis with respect to the grinding wheel, which requires a new zeroing of the dressing wheel before each dressing operation.
• the present invention has for its object to provide a method and an apparatus by means of which these disadvantages can be eliminated and which allow a more rational grinding of workpieces and dressing of grinding wheels than was previously the case.
• an increase in grinding precision and quality should also be achieved thanks to the invention.
• FIG. 1 schematically shows the arrangement of the various components of a conventional grinding machine with workpiece, grinding wheel and dressing wheel, and their relative positional relationships, from above,
• FIG. 2 schematically shows the arrangement of the same components of a grinding machine which is equipped with a device according to the invention, with their relative positional relationships, from above, 3 details of the dressing wheel and its receiving device in partial section and
• FIG. 1 a longitudinal slide 1 which can be displaced along the longitudinal axis, the so-called Z-axis of the grinding machine, in the direction of the double arrow z and which carries a turntable 2 which, with respect to the longitudinal slide 1, about the vertical axis the grinding machine, the so-called B-axis can be rotated in the direction of the double arrow b.
• the rotary table 2 is shown laterally offset in relation to the longitudinal slide 1 in the drawing. In fact, the two points through which the B axis passes are located vertically one above the other.
• a turntable 3 and a tailstock 4 are generally mounted on the turntable 2 and define the so-called C-axis of the grinding machine between their counter tips 5 and 6, around which a workpiece 7 clamped between the counter tips 5 and 6 Direction of the double arrow c can be rotated.
• a dressing wheel 8 with a drive unit 9 mounted on the turntable 2 can also be seen. The latter serves to rotate a so-called A-axis of the grinding machine in the direction of the double arrow a and on the so-called X-axis in the direction of the Double arrow x sliding grinding wheel 10 at regular intervals during the grinding of the workpiece 7 to guarantee the desired grinding quality over the longest possible time.
• This dressing of the grinding wheel is of the greatest importance, in particular in the case of profiled grinding wheels, in order to change the profile surface of the grinding wheel as a result of wear and the resulting imprecise grinding shapes of the workpiece avoid.
• a grinding line SL 1 is defined between the grinding wheel 10 and the workpiece 7 to be ground, on which workpiece 7 and grinding wheel 10 come into contact with one another during the grinding process.
• it is absolutely necessary to determine the exact spatial position of this grinding line SL 1 with respect to the C-axis and with respect to the A-axis, respectively. to know the grinding wheel starting line 10 '.
• It is also essential to know the position of the axis of rotation of the workpiece, that is to say the C axis with respect to the longitudinal axis, that is to say the Z axis and with respect to the grinding wheel circumference line 10 f , in order to be able to correctly program the grinding process.
• the corresponding values can be determined automatically by means of electronic measuring devices and built into the grinding program. It is known that on grinding machines such as the one described above, by moving the turntable 2 or. of the longitudinal slide 1 carrying this, along the double arrow z and simultaneous displacement of the grinding wheel 10 along the double arrow x and optionally by rotating the C axis relative to the Z axis, a large number of workpiece shapes can be ground.
• FIG. 2 shows a comparable grinding machine, which differs from that in FIG. 1 in that the dressing wheel 8 is not fastened on the rotary table 2, but is fixedly connected to the longitudinal slide 1 by means of a device according to the invention.
• the device according to the invention is essentially a drive 11 and a receptacle 13 (FIG. 3) for the dressing wheel 12, which drive 11 defines an axis of rotation C around which the dressing wheel 12 in the direction of the double arrow c ' is rotatable. Furthermore, this drive defines a perpendicular axis B 'parallel to the B axis, about which said C f axis can be pivoted.
• the circumferential line of the dressing wheel 12 remains defined at any time after a single zeroing thereof, regardless of any displacements of the C axis of the workpiece 7 and the grinding line SL 1 between the workpiece 7 and the grinding wheel 10. Thanks to this arrangement of the dressing wheel 12 and its positioning by means of the drive 11, it is possible at any time during a grinding process to pull the grinding wheel 10 away from the workpiece 7 and, after the longitudinal slide 1 has been displaced along the Z axis, to the known distance from the A-oh se, resp. the peripheral line 10 'of the grinding wheel dressing wheel, respectively. of the circumferential line or the grinding line SL 2 without a calibration process being necessary.
• the grinding wheel 10 can be carried out after the dressing process also again automatically and without calibration operation to the workpiece 7, respectively.
• the grinding line SL 1 can be brought up to continue the grinding process.
• a simple zeroing with respect to the new workpiece is sufficient, since the spatial position of the circumferential line of the dressing wheel 12 remains unchanged due to the clamping of a new workpiece. remained continuously defined.
• the dressing wheel 12 is mounted on a cone 14 in the context of the invention. Furthermore, one can see the double bearing of the spindle 15 having the cone 14, which is mounted on the one hand in its front part in a first spindle bearing 16 and in its rear part in a second spindle bearing 17.
• the conical clamping of the dressing wheel 12 on the spindle 15 and the double bearing of the latter mean that, according to the invention, the dressing wheel 12 is guided much more precisely and stably than conventional dressing wheels 8, which increases the precision of dressing the grinding wheel ben enables.
• the spindle 15 is also driven by a worm gear 18, which can be done in both directions of the double arrow c '(FIG.
• 4 and 5 illustrate dressing examples which cannot be realized with any conventional dressing method or device, since there is no third, controllably movable and adjustable axis. Due to the motor drive of the B'-axis of the device according to the invention, the dressing wheel 12 can execute NC-controlled pivoting movements about this axis in such a way that a 3-dimensional dressing of grinding wheels 10 is possible. 4 illustrates this on the one hand on a grinding wheel 10 with an outside radius of 180 °, which can be dressed in such a way that the dressing wheel 12 is at any time perpendicular to the grinding wheel surface or circumferential line 10 '.
• a grinding wheel 10 drawn back on both sides can also be dressed with the device according to the invention, as can be seen from FIG. 5.
• the present invention has significant advantages over the previous dressing methods for grinding wheels, since the zeroing of the C axis no longer influences the positioning of the dressing wheel.
• the very precise and stable guidance of the dressing wheel 12 enables the dressing quality to be increased without this affecting the dressing speed.
• the fact that a new zeroing of the C-axis after each dressing process and a practical determination of the position of the grinding line SL 2 between the dressing wheel and the grinding wheel before each dressing process are superfluous thanks to the invention brings about a considerable acceleration of the work the grinding machine. It is also advantageous that practically every modern NC-controlled grinding machine can be converted and reprogrammed in such a way that the method according to the invention can be used on it.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Grinding-Machine Dressing And Accessory Apparatuses (AREA)
• Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=4182508

Family Applications (1)

Country Status (5)

Cited By (2)

Families Citing this family (6)

Citations (5)

Family Cites Families (7)

• 1987
  • 1987-01-25 CH CH241/87A patent/CH671912A5/de not_active IP Right Cessation
• 1988
  • 1988-01-20 US US07/269,769 patent/US4936051A/en not_active Expired - Fee Related
  • 1988-01-20 EP EP88900763A patent/EP0299014A1/de not_active Withdrawn
  • 1988-01-20 WO PCT/CH1988/000011 patent/WO1988005367A1/de not_active Application Discontinuation
  • 1988-01-20 JP JP63500891A patent/JPH01502500A/ja active Pending

Patent Citations (5)

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