Abstract
A device and method for grinding and/or milling teeth of saw bands where a feed device for the clocked feeding of a temporary workpiece is formed from a plurality of mutually parallel saw bands includes a clamping unit into which the temporary workpiece is clamped, and a machining unit with at least one machining tool for simultaneous machining of a plurality of teeth of the temporary workpiece is individually modifiable and with which these types of teeth of saw bands can be efficiently and economically manufactured. The clamping unit is displaceable together with the feed device along a feed direction.
Claims
1. A device (1) for grinding and/or milling teeth of saw bands (3), comprising: a feed device (4) for the clocked feeding of a temporary workpiece (5), wherein the temporary workpiece (5) is formed from a plurality of mutually parallel saw bands (3), a clamping unit (6) into which the temporary workpiece (5) is clamped, and a machining tool unit (7) with at least one machining tool (8) for simultaneous machining of a plurality of teeth of the temporary workpiece (5), wherein the clamping unit (6) is displaceable together with the feed device (4) along a feed direction (9).
2. The device (1) according to claim 1, wherein the clamping unit (6) is arranged on the feed device (4).
3. The device (1) according to claim 1, wherein the clamping jaw edges (10) of the clamping unit (5) are oriented along the feed direction (9) and are at least twice as long as a machining width (11) of the machining tool (8).
4. The device (1) according to claim 3, wherein the clamping jaw edges (10) have a tooth contour at least in sections with a plurality of teeth.
5. The device (1) according to claim 1, wherein the press down unit (12) for pressing down the temporary workpiece (5) is arranged on the feed device (4).
6. The device (1) according to claim 1, comprising an auxiliary clamping unit (13) respectively in front of and behind the clamping unit (6) along the feed direction (9).
7. The device (1) according to claim 1, wherein the machining unit (7) has a grinding tool and/or a milling tool.
8. The device (1) according to claim 1, wherein the dressing unit (14) is displaceable along a first and/or a second axis (15, 16) for dressing the machining tool (8), wherein the dressing unit (14) has a respective dressing drive (17) for the displacement along the first and second axis (15, 16).
9. The device (1) according to claim 8, wherein the dressing unit (14) has a receptacle (18) for receiving at least two dressing tools (19) which are different from one another.
10. The device (1) according to claim 8, wherein the machining unit (7) has a sensor unit, wherein a contact between the machining tool (8) and the dressing tool (19) is measurable by the sensor unit.
11. The device (1) according to claim 1, wherein the cooling unit (21) for cooling the machining tool (8) comprises a plurality of nozzles directed at the machining tool (8), wherein the cooling unit (21) is displaceable in such a way that a predefined spacing between the nozzles and the machining tool (8) is essentially constant.
12. A method for grinding and/or milling teeth of saw bands, comprising the following steps: pressing down and clamping a plurality of parallel, identical saw bands to generate a temporary workpiece, first simultaneous machining of a first plurality of teeth of the temporary workpiece to generate either tooth backs and/or tooth faces, first displacement of the temporary workpiece along a feed direction, second simultaneous machining of the first plurality of teeth to generate either tooth backs and/or tooth faces, depending on which were not generated during the first simultaneous machining, second displacement of the temporary workpiece along a feed direction, and direct repetition of the first displacement of the temporary workpiece and of the first and second simultaneous machining of a further plurality of teeth of the temporary workpiece.
13. The method according to claim 12, wherein the temporary workpiece is moved farther by the second displacement than by the first displacement.
14. The method according to claim 12, wherein the first and/or second displacement of the temporary workpiece is less than or equal to a machining width of a machining tool.
15. The method according to claim 12, wherein a clamping unit, clamping the temporary workpiece, and a feed unit, displacing the temporary workpiece, are moved together in an unchanging relative position to one another.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The figures of the drawing shown in detail in:
[0028] FIG. 1 First section of a perspective side view of the device;
[0029] FIG. 2a Second section of a perspective side view of the device;
[0030] FIG. 2b Second section of a perspective side view of the device with a temporary workpiece;
[0031] FIG. 3 Third section of a perspective side view of the device with a temporary workpiece;
[0032] FIG. 4 Fourth section of a perspective side view of the device;
[0033] FIG. 5 Perspective view of the dressing unit in a first embodiment;
[0034] FIG. 6 Perspective view of the dressing unit in a second embodiment.
DETAILED DESCRIPTION
[0035] FIG. 1 shows a first section of a perspective side view of device 1 comprising a feed device 4, a clamping unit 6 arranged thereon, and a press down unit 12 likewise arranged thereon. Feed device 4 is accommodated in a machine bed 39. A temporary workpiece 5 made of saw bands 3 arranged directly and mutually parallel is in clamping unit 6. A machining unit 7 is arranged above feed device 4, clamping unit 6, and press down unit 12, wherein machining unit 7 in this preferred embodiment has a grinding disk as machining tool 8, which is rotatably mounted via a tool holder 40 of machining unit 7. A linearly displaceable cooling unit 21 is arranged on machining unit 7 for cooling machining tool 8 and temporary workpiece 5 in a use case. A dressing unit 14 with a diamond wheel as dressing tool 19 is likewise arranged on machining unit 7, wherein dressing tool 19 is displaceable along a first axis 15 and a second axis 16 arranged perpendicular to first axis 15 for customized dressing of machining tool 8. An auxiliary clamping unit 13 is arranged along a feed direction 9 in front of clamping unit 6 and an auxiliary clamping unit 13 is likewise arranged behind clamping unit 6 for clamping and fixing the plurality of saw bands 3 arranged mutually parallel. In the direction of feed direction 9, mutually parallel saw bands 3 have teeth, not depicted, which are introduced by machining unit 7. A not visible feed spindle 26 of feed device 4 is covered by means of a bellows 23, in order to protect the same from chips and other contaminants arising during manufacturing. Machining unit 7 rests on two rail guides 24, so that the same is displaceable in the horizontal direction perpendicular to feed direction 9, and may thus process temporary workpiece 5 by means of creep feed grinding methods. Machining unit 7 likewise has a linear guide, which is oriented in a vertical plane in such a way that an imaginary straight line connecting the tooth crests of the teeth to be manufactured lies in a horizontal plane. Machining tool 8 is displaceable, in particular in the vertical direction, by means of the linear guide of machining unit 7. Guide rollers 25 for guiding saw bands 3 are arranged in feed direction 9 behind rear auxiliary clamping unit 13. Clamping jaws 28 of both clamping unit 6 and also those of auxiliary clamping units 13 are displaceable parallel to rail guides 24 of machining unit 7. A free space between feed device 4 and machining unit 7 is defined as processing space 33 of the device.
[0036] FIG. 2a shows a second section of a perspective side view of device 1 comprising feed device 4 without bellows 23, so that feed spindle 26 is visible. The feed spindle translates a rotational movement, generated by a feed drive 30, into a potential linear movement along feed direction 9 of a feed slide 31, on which clamping unit 6 is arranged. Feed slide 31 is likewise mounted via two rail guides 24. Feed direction 9 is correspondingly oriented parallel to the longitudinal axes of rail guides 24 of feed device 4. Clamping device 6 is pre-adjustable by means of a manual clamping lever 27 to a specified width between clamping jaws 28 of clamping unit 6. Clamping jaws 28 may be hydraulically pressed together to a predefined pressure during a use of device 1 in order to clamp saw bands 3, not depicted, therein. A clamping jaw 28 of clamping unit 6 has a band stop groove 29, in which a band stop, not depicted, may be inserted and supported, in order to facilitate a first introduction and positioning of saw bands 3 in device 1. Clamping jaw edges 10 of clamping jaws 28 extend horizontally parallel to feed direction 9 and delimit vertical contact surfaces of clamping jaws 28, on which a saw band 3, not depicted, respectively contacts. Clamping unit 6 further has a contact surface 32, arranged between clamping jaws 28 and on which temporary workpiece 5, not depicted, rests in a use case. Viewed along feed direction 9, an auxiliary clamping unit 13, 13 is arranged respectively in front of and behind clamping unit 6 for the accommodation of saw bands 3.
[0037] FIG. 2b shows the second section, depicted in FIG. 2a, of a perspective side view of device 1 with temporary workpiece 5, which is clamped in clamping unit 6. Temporary workpiece 5 is depicted in a simplified way as a component; however, it is formed from a plurality of mutually parallel saw bands 3. Saw bands 3 are each further clamped between two auxiliary clamping jaws 38 of both auxiliary clamping units 13, 13. Feed slide 31 of feed device 4 and accordingly also clamping device 6, which is rigidly connected to feed slide 31, are located in their foremost position in feed direction 9. Temporary workpiece 5 rests flat on a horizontal contact surface 32.
[0038] FIG. 3 shows a third section of a perspective side view of device 1 with a temporary workpiece, wherein the third section depicts the same components of device 1 as the second section, with the difference that feed slide 31 of feed device 4, and accordingly also clamping device 6 are located in their rearmost position in feed direction 9. In this position, a processing of temporary workpiece 5 by machining unit 7, not depicted, is impossible. Instead, the displacement of temporary workpiece 5 in feed direction 9 by means of clamping unit 6 enables a clocking of saw bands 3 in a way that, upon releasing clamping unit 6 and releasing temporary workpiece 5, clamping unit 6 may subsequently move into a foremost position, depicted in FIGS. 2a, b, in order to once again clamp in a new temporary workpiece 5, whose processing has not yet been carried out by machining unit 7. During a displacement of clamping unit 6 counter to feed direction 9, saw bands 3 contact auxiliary clamping jaws 38, and are fixed via auxiliary clamping units 13, 13.
[0039] FIG. 4 shows a fourth section of a perspective side view of device 1, wherein a press down unit 12 is arranged on feed device 4 in addition to clamping unit 6. Press down unit 12 has rail guides 24 arranged parallel to rail guides 24 of machining unit 7. In addition, press down unit 12 has two tool holders 34, displaceable along feed direction 9, and press down tools 35 arranged thereon, wherein press down tools 35 are designed as triangular knives. A hydraulic hose 36 is respectively arranged on tool holders 34 in order to hydraulically depress press down tool 35 as needed.
[0040] FIG. 5 shows a perspective view of dressing unit 14 in a first embodiment with a diamond profile roller as dressing tool 19, which is connected to a dressing drive 17 via a receptacle 18. Dressing unit 14 is displaceable along a first axis 15 in order to approach a machining tool 8, not depicted, and to correspondingly dress the same. The diamond profile roller has a negative contour of the contour of machining tool 8. In this embodiment, the width of dressing tool 19 corresponds to the machining width 11 of machining tool 8, not depicted. In this first embodiment, dressing unit 14 is mounted on an adapter plate 41.
[0041] FIG. 6 shows a perspective view of dressing unit 14 in a second embodiment with a diamond wheel as dressing tool 19, which is likewise connected to a dressing drive 17 via receptacle 18. A spacing sleeve 37 is arranged adjacent to the diamond wheel as dressing tool 19 on receptacle 18, so that the diamond wheel is fixedly positionable. Dressing unit 14 is displaceable along a first axis 15 and along a second axis 16, so that dressing tool 19 may travel a custom contour on machining tool 8 to be dressed. In the second embodiment, adapter plate 41 is demounted and instead of that, dressing unit 14 is supplemented by the components for displacing dressing unit 14 along second axis 16.
LIST OF REFERENCE NUMERALS
[0042] 1 Device [0043] 3 saw band [0044] 4 Feed device [0045] 5 Temporary workpiece [0046] 6 Clamping unit [0047] 7 Machining unit [0048] 8 Machining tool [0049] 9 Feed direction [0050] 10 Clamping jaw edge [0051] 11 Machining width [0052] 12 Press down unit [0053] 13, 13 Auxiliary clamping unit [0054] 14 Dressing unit [0055] 15 First axis [0056] 16 Second axis [0057] 17 Dressing drive [0058] 18 Receptacle [0059] 19 Dressing tool [0060] 21 Cooling unit [0061] 23 Bellows [0062] 24, 24, 24 Rail guide [0063] 25 Guide rollers [0064] 26 Feed spindle [0065] 27 Clamping lever [0066] 28 Clamping jaws [0067] 29 Band stop groove [0068] 30 Feed drive [0069] 31 Feed slide [0070] 32 Contact surface [0071] 33 Processing space [0072] 34 Tool holder [0073] 35 Press down tool [0074] 36 Hydraulic hose [0075] 37 Spacing sleeve [0076] 38 Auxiliary clamping jaws [0077] 39 Machine bed [0078] 40 Tool holder [0079] 41 Adapter plate
