A MACHINE HAVING A CLEANING DEVICE AND OPTICAL MEASURING DEVICE

Abstract

A machine for machining workpieces includes a movably mounted table (1) and at least one clamp (2). Each clamp is engageable with a workpiece and can be rotatably driven relative to the table. Each workpiece is transportable by movement of the table to a first workstation (3). Workstation 3 includes a toolholder (4) that holds a tool that is operative to machine a surface of the workpiece. The toolholder is movable in engagement with the workpiece by a feed unit (5) and the orientation of the tool holder relative to the workpiece is changeable by movement of an alignment unit (6). A second workstation to which the workpiece is moved after machining includes a cleaning device (8). A third workstation to which the workpiece is moved after cleaning includes a measuring device (10) that optically determines at least one surface property of the machined surface. The measuring device is in connection with an evaluation unit (14). The evaluation unit evaluates the at least one surface property and determines a direction and an order of magnitude that the alignment unit must be adjusted so at least one subsequently machined workpiece meets required tolerance specifications.

Claims

1-10. (canceled)

11. Apparatus comprising: a machine operative to machine workpieces that have associated required tolerance specifications that workpieces must meet after machining, the machine including a table, wherein the table is rotatably movably mounted on the machine, a clamp, wherein the clamp is in operative connection with the table, is operable to hold a workpiece in engaged relation with the clamp, and is rotatably movable relative to the table, wherein the table is rotatable to move the workpiece in engagement with the clamp to each of at least three disposed workstations on the machine, wherein a first workstation includes a tool, wherein the tool is operative to machine a surface of the workpiece at the first workstation, a feed unit, wherein the tool is in operative connection with the feed unit, and wherein the feed unit is operative to move the tool relative to and in engaged relation with the workpiece at the first workstation, an alignment unit, wherein the alignment unit is in operative connection with the feed unit, is movably mounted in operative connection with the machine, wherein movement of the alignment unit is operative to change alignment of the tool relative to the workpiece at the first workstation, wherein a second workstation to which the workpiece is moved by rotation of the table after being machined by the tool at the first workstation, includes at least one of the laser and a CO.sub.2 snow jet, wherein the at least one of the laser and the CO.sub.2 snow jet is operative to clean the workpiece at the second workstation to remove at least one of coolant and lubricant residue, wherein a third workstation to which the workpiece is moved by rotation of the table after the workpiece is cleaned at the second workstation, includes a measuring device, wherein the measuring device is operative to determine an optical property of the machined surface of the workpiece, an evaluation unit, wherein the evaluation unit is in operative connection with the measuring device, is operative responsive to the determined optical property to calculate at least one of a direction and an order of magnitude that the alignment unit needs to be adjusted for a subsequent workpiece that is machined through machine operation to comply with the required tolerance specifications.

12. The apparatus according to claim 11 wherein the alignment unit includes at least one electrically controllable actuator, wherein the at least one electrically controllable actuator is operative to move the alignment unit responsive to the at least one calculated direction and order of magnitude.

13. The apparatus according to claim 11 wherein the feed unit comprises a slide.

14. The apparatus according to claim 11 wherein the feed unit comprises an electrically operable carriage.

15. The apparatus according to claim 11 wherein the second workstation comprises a nozzle, wherein the nozzle is operative to generate the CO.sub.2 snow jet.

16. The apparatus according to claim 11 wherein the second workstation comprises a laser, wherein the laser is operative to produce a laser beam.

17. The apparatus according to claim 11 wherein the second workstation comprises a chamber, wherein the chamber at least partially encloses the workpiece while it is cleaned by the at least one of the CO.sub.2 snow jet and the laser.

18. The apparatus according to claim 11 wherein the measuring device comprises an interferometer, wherein the interferometer is operative to detect at least one of planarity and roughness of the machined surface.

19. The apparatus according to claim 11 wherein the measuring device comprises a white light interferometer.

20. The apparatus according to claim 11 wherein the measuring device is operative to determine at least one of planarity and roughness of the machined surface.

21. The apparatus according to claim 11 wherein the machine includes at least three clamps, and wherein each clamp is operative to engage a respective workpiece.

22. The apparatus according to claim 11 wherein the alignment unit includes at least one electrically controllable actuator, wherein the at least one electrically controllable actuator is operative to move the alignment unit responsive to the at least one calculated direction and order of magnitude so as to change the angle of attack of the tool relative to the workpiece.

23. The apparatus according to claim 11 wherein the feed unit includes at least one of a slide and a carriage, wherein the feed unit is in operative connection with a toolholder, wherein the toolholder is operative to hold the tool, wherein the alignment unit includes at least one electrically controllable actuator operative to move the toolholder responsive to the at least one calculated direction an order of magnitude.

24. Apparatus comprising: a machine operative to machine workpieces to required tolerance specifications, the machine including a table, wherein the table is movably mounted in operative connection with the machine, a plurality of clamps, wherein each of the clamps is in operative connection with the table, is disposed from each of the other clamps, and is configured to hold a respective workpiece, a plurality of workstations, wherein the table is operative to move each clamp and a respective engaged workpiece sequentially through each of the plurality of workstations, wherein the plurality of workstations includes a machining workstation, wherein the machining workstation includes a tool, an electrical actuator, wherein the electrical actuator is in operative connection with the tool, wherein the tool is moved relative to and in engagement with the workpiece at the machining workstation responsive at least in part to the electrical actuator to cause a surface of the workpiece to be machined, wherein the plurality of workstations includes a cleaning workstation to which a workpiece is moved by the table through operation of the machine subsequent to the workpiece being machined in the machining workstation, wherein the cleaning workstation includes at least one of a laser and a CO.sub.2 snow jet which is operative to clean the workpiece at the cleaning workstation, wherein the plurality workstations includes a measuring workstation to which a workpiece is moved by the table through operation of the machine subsequent to the workpiece being cleaned at the cleaning workstation, wherein the measuring workstation includes an interferometer, wherein the interferometer is operative to sense at least one property of the machined surface of the workpiece at the measuring workstation, wherein the at least one property includes at least one of planarity and roughness, wherein the machine is operative to change a position of the tool by the electrical actuator at the machining workstation in machining subsequent workpieces to meet the required tolerance specifications in response to the at least one property of the machined surface sensed at the measuring workstation.

25. The apparatus according to claim 24 wherein the machine further includes an evaluation unit, wherein the evaluation unit is in operative connection with the interferometer, wherein the evaluation unit is operative to determine at least one of a direction and an order of magnitude of movement of change to the position of the electrical actuator.

26. The apparatus according to claim 25 wherein the machining workstation includes at least one of a tool slide and a tool carriage, wherein the tool is operative to move relative to and in engaged relation with the workpiece at the machining workstation in operative supported connection with the at least one of the tool slide and the tool carriage, wherein the electrical actuator is operative to change an angle of attack of the tool relative to the workpiece.

27. The apparatus according to claim 25 wherein the electrical actuator is operative to change orientation of the tool relative to the workpiece at the machining workstation as the workpiece undergoes machining at the machining workstation.

28. A method comprising: operating a machine to machine workpieces that have associated required tolerance specifications that workpieces must meet after machining, the machine including: a table, wherein the table is rotatably movably mounted on the machine, a clamp, wherein the clamp is in operative connection with the table, is operable to hold a workpiece in engaged relation with the clamp, and is rotatably movable relative to the table, wherein the table is rotatable to move the workpiece in engagement with the clamp to at least three disposed workstations on the machine, the method including: a) engaging a surface of the workpiece with a tool at a first workstation to machine a surface of the workpiece, wherein the tool is moved during machining of the surface of the workpiece at the first workstation by a feed unit, wherein the first station includes an alignment unit, wherein the alignment unit is in operative connection with the tool and is selectively movable responsive to at least one electrical actuator to change orientation of the tool relative to the workpiece during machining of the surface at the workstation, b) moving the workpiece though movement of the table to a second workstation subsequent to machining of the surface workpiece at the first workstation, c) cleaning the workpiece at the second workstation with at least one of a laser and a CO.sub.2 snow jet to remove at least one of coolant and lubricant residue from the workpiece, d) moving the workpiece to a third workstation subsequent to cleaning of the workpiece at the second workstation, e) determining at least one optical property of the machined surface of the workpiece at the third workstation through operation of an interferometer, f) operating the electrical actuator in response to the determined at least one optical property to change orientation of the tool relative to at least one workpiece subsequently machined at the first workstation to cause such at least one subsequently machined workpiece to comply with the required tolerance specifications.

29. The method according to claim 28 and further comprising: operating an evaluation unit using the determined optical property, to calculate at least one of a direction and an order of magnitude of electrical actuator movement to cause the at least one subsequently machined workpiece to comply with required tolerance specifications, wherein in (f) the electrical actuator is operative to move at least one of the direction and by the order of magnitude responsive to the calculation by the evaluation unit.

30. The method according to claim 29 wherein in (e) the at least one optical property determined includes at least one of planarity and roughness.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0030] The example arrangements are explained in the following by way of example with reference to the Figures.

[0031] FIG. 1 is a top view of an exemplary machine, and

[0032] FIG. 2 is a longitudinal section through a measuring station of the exemplary machine.

DETAILED DESCRIPTION OF EXAMPLE ARRANGEMENTS

[0033] The machine shown in FIG. 1 comprises a table 1 designed as a round table, on which a plurality of clamping devices 2 which are alternatively referred to herein as clamps, are supported. The clamping devices 2 can each be brought to an adjacent station by rotating the table 1. In a loading station 12, a workpiece is clamped into the corresponding clamping device 2. Machining is carried out in the following stations, for example. In the station identified as the first station 3, a finish machining is then carried out, during which the clamping device 2 with the work piece fixed therein is driven in a rotatory manner. At the same time, a tool holder 4 holding the tool is rotationally driven relative to and in engagement with the rotating workpiece.

[0034] The tool holder 4 is fed linearly to the workpiece in the first station 3 by means of a feed unit 5, while the alignment of the tool holder 4 can be changed by an alignment unit 6.

[0035] Thereafter, the finish-machined workpiece is transferred in engagement with the clamping device 2 into a second station 7, that is disposed from the first station in which a cleaning device 8 is arranged. In example arrangements the second station 7 can be isolated from adjacent stations by suitable separating means. As can be seen the cleaning device 8 comprises a chamber 11 which can be closed above the workpiece. In the chamber 11, a CO.sub.2 jet is directed onto the surface of the workpiece to be cleaned. The vaporized carbon dioxide is drawn off by an extraction device.

[0036] After the cleaning, the workpiece is transferred into a third station 9 that is disposed from the second station, in which a measuring device 10 is arranged. The exemplary measuring device 10 detects at least one surface property of the finish-machined and cleaned outer surface of the workpiece. This detected surface property can be stored. In addition, the exemplary measuring device 10 is connected to an evaluation unit 14, which includes circuitry that determines on the basis of the measurement result, the extent to which the alignment unit 6 of the first station 3 has to be readjusted in order to meet the specified tolerances for acceptable machined workpieces. For example, an angle of attack of the tool holder 4 relative to the workpiece can be changed, wherein the example evaluation unit 14 specifies, by which angle the alignment unit 6 has to be pivoted for the finish machining of a subsequent workpiece. When the alignment unit 6 can be operated electrically, the change in the orientation of the tool for the machining of a subsequent workpiece can also be carried out automatically.

[0037] Thus the example embodiments achieve improved operation, eliminate difficulties encountered in the use of prior devices and systems, and attain the useful results described herein.

[0038] In the foregoing description certain terms have been used for brevity, clarity and understanding. However, no unnecessary limitations are to be implied therefrom because such terms are used for descriptive purposes and are intended to be broadly construed. Moreover, the descriptions and illustrations herein are by way of examples and the new and useful features are not limited to the exact features show and described.

[0039] Further in the following claims any feature described as a means for performing a function shall be construed as encompassing any means known to those skilled in the art as being capable of carrying out the recited function, and shall not be deemed limited to the particular means shown or described for performing the recited function in the foregoing description or mere equivalents thereof.

[0040] Having described the feathers, discoveries and principals of the exemplary embodiments, the manner in which they are constructed and operated, and the advantages and useful results attained; the new and useful structures, devices, elements, arrangements, parts, combinations, systems, equipment, operations, methods, processes and relationships are set forth in the appended claims.

LIST OF REFERENCE NUMERALS

[0041] 1 Table

[0042] 2 Clamping device

[0043] 3 First station

[0044] 4 Tool holder

[0045] 5 Feed unit

[0046] 6 Alignment unit

[0047] 7 Second station

[0048] 8 Cleaning device

[0049] 9 Third station

[0050] 10 Measuring device

[0051] 11 Chamber

[0052] 12 Loading station

[0053] 14 Evaluation unit