TRUING DEVICE

Abstract

A truing device for truing a grinding tool having a specified grinding profile, includes at least one first truing region and a second truing region connected thereto. The first truing region has a first specification for sharpening the grinding profile of the grinding tool and the second truing region has a second specification, different from the first specification, for restoring the grinding profile of the grinding tool. The first truing region has a greater volume than the second truing region, the truing device has a longitudinal axis, the two truing regions are arranged one behind the other in the direction of the longitudinal axis, and the truing device is substantially cuboid.

Claims

1. A dressing apparatus for dressing a grinding tool provided with a predetermined grinding profile, wherein the dressing apparatus includes at least a first dressing region and a second dressing region connected thereto, wherein the first dressing region has a first specification for sharpening the grinding profile of the grinding tool and the second dressing region has a second specification differing from the first specification for restoring the grinding profile of the grinding tool, the first dressing region is of a larger volume than the second dressing region, the dressing apparatus has a longitudinal axis, the two dressing region are arranged in succession in the direction of the longitudinal axis and the dressing apparatus is of a substantially cuboidal configuration.

2. The dressing apparatus according to claim 1, wherein the volume of the first dressing region is about 4 to 7 times, preferably about 6 times, greater than the volume of the second dressing region.

3. The dressing apparatus according to claim 1, wherein the dressing apparatus has: a length of 150 mm to 250 mm, particularly preferably 180 mm to 200 mm, and/or a width of 25 mm to 75 mm, particularly preferably about 50 mm, and/or a thickness of 2.0 mm to 10.0 mm, particularly preferably about 3.0 mm, 4.0 mm or 5.5 mm.

4. The dressing apparatus according to claim 1, wherein the first specification: has a mean pore size of 200 to 500 m, preferably about 350 m, and/or has white corundum as the abrasive grain, and/or has an abrasive grain of a grain size of 120 to 220 mesh, preferably about 180 mesh.

5. The dressing apparatus according to claim 1, wherein the second specification: has a porosity in the range of 10 to 15 percent by volume, and/or has a mixture of white corundum and pink corundum and/or red corundum as the abrasive grain, and/or has an abrasive grain with a grain size of 35 to 100 mesh, preferably about 55 mesh.

6. The dressing apparatus according to claim 1, wherein the dressing apparatus has a holding region for holding the dressing apparatus when dressing the grinding tool, preferably wherein: the holding region is of an abrasive grain-less nature and/or is secured by adhesive or sintering, and/or substantially comprises a water-soluble material.

7. A method of dressing a grinding tool by the dressing apparatus according to claim 1, including a first method step in which the grinding profile of the grinding tool is restored by means of the second dressing region of the at least one dressing apparatus, and a second method step in which the grinding profile of the grinding tool is sharpened by means of the first dressing region of the at least one dressing apparatus.

8. The method according to claim 7, wherein the first method step is repeated at a first frequency before the second method step is carried out and the second method step is repeated at a second frequency after conclusion of the first method step which is repeated at the frequency N1, wherein N1<N2.

9. The method according to claim 7, wherein, before the second method step is carried out the first method step is carried out or repeated until at least a predominant part of the second dressing region is used up and after conclusion of the first method step the second method step is carried out or repeated until at least a predominant part of the first dressing region is used up.

10. The method according to claim 7, wherein the grinding tool is used a plurality of times for grinding at least one workpiece, preferably a glass pane, before the first method step and/or between the first and second method steps and/or after the second method step and/or between an optionally provided repetition of the first or second method step.

11. The method according to claim 7, wherein the dressing apparatus has a holding region for holding the dressing apparatus when dressing the grinding tool and the at least one dressing apparatus is held at least at the holding region in a feed device at least during the first and second method steps.

12. The method according to claim 7, wherein the method is carried out sequentially with a plurality of successive dressing apparatuses, wherein a further dressing apparatus, is fed preferably from a magazine as soon as a preceding dressing apparatus is used up at least for the predominant part.

13. The method according to claim 7, wherein the method takes place in fully automated mode at least for the predominant part.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Further details and advantages of the invention are described more fully hereinafter by means of the specific description with reference to the drawings in which:

[0034] FIG. 1a is a diagrammatic perspective view of an arrangement comprising a workpiece, a grinding tool and a dressing apparatus,

[0035] FIG. 1b is a diagrammatic side view of a grinding operation on a workpiece, wherein the illustrated dressing apparatus is out of engagement,

[0036] FIG. 1c is a diagrammatic side view of an arrangement comprising a workpiece and a grinding tool before the beginning of a grinding operation,

[0037] FIG. 1d is a diagrammatic side view of an arrangement comprising a workpiece and a grinding tool during a grinding operation,

[0038] FIG. 2a is a diagrammatic perspective view of a first preferred embodiment of a dressing apparatus,

[0039] FIG. 2b is a diagrammatic perspective view of a second preferred embodiment of a dressing apparatus,

[0040] FIG. 3 is a diagrammatic perspective view of an arrangement comprising a grinding tool and two dressing apparatuses in a first embodiment,

[0041] FIG. 4a is a diagrammatic side view of an arrangement comprising a grinding tool and a plurality of dressing apparatuses in a second embodiment,

[0042] FIG. 4b is a diagrammatic side view of an arrangement comprising a grinding tool and a plurality of dressing apparatuses in a third embodiment,

[0043] FIG. 4c is a diagrammatic side view of an arrangement comprising a grinding tool and a plurality of dressing apparatuses in a fourth embodiment,

[0044] FIG. 5 is a diagrammatic enlarged view of a part of a dressing apparatus,

[0045] FIG. 6a is a diagrammatic side view of the dressing step of profiling a grinding tool by means of a dressing apparatus,

[0046] FIG. 6b is a diagrammatic side view of the dressing step of sharpening a grinding tool by means of a dressing apparatus, and

[0047] FIG. 7 is a diagrammatic view illustrating a method of dressing a grinding tool which is used for processing a workpiece, by means of at least one dressing apparatus.

DETAILED DESCRIPTION OF THE INVENTION

[0048] FIG. 1a shows a grinding tool 2 mounted rotatably about an axis of rotation 33. The grinding tool 2 has a groove-shaped grinding profile 14, with which the edge 51 of a workpiece 15 in the form of a glass pane can be ground. It will be appreciated that the invention is not limited to dressing a grinding profile of a groove-shaped configuration of a grinding tool.

[0049] The workpiece 15 is mounted displaceably and rotatable in all directions 52 in space. In addition there is provided a feed device 16 in which a dressing apparatus 1 is mounted. The dressing apparatus 1 is held in the feed device 16 in positively locking relationship. In addition there is provided a hold-down clamp 30 for holding the dressing apparatus 1.

[0050] As FIG. 1b shows the workpiece 15 can be arranged for example by way of holding devices 31 on a carrier 32, wherein the holding devices 31 and/or the carrier 32 can be displaceable in the directions 52 in space.

[0051] As FIG. 1b further shows the grinding tool 2 can be clamped in a clamping device 28 of a grinding machine 26.

[0052] The sequence of FIGS. 1c and 1d diagrammatically shows the operation of grinding the edge 51 of the workpiece 15 by means of the grinding tool 2. In the position shown in FIG. 1c the edge 51 of the workpiece 15 is spaced from the grinding profile 14 of the grinding tool 2. In the position shown in FIG. 1d the grinding profile 14 of the grinding tool 2 is in engagement with the edge 51 of the workpiece 15. In that case material of the workpiece 15 is removed by a relative movement of the grinding profile 14 and the abrasive grains 13 therein relative to the workpiece 15.

[0053] In accordance with a first preferred embodiment shown in FIG. 2a the dressing apparatus 1 has a first dressing region 3 and a second dressing region 4 connected thereto, wherein the first dressing region 3 has a first specification for sharpening the grinding profile 14 of the grinding tool 2 and the second dressing region 4 has a second specification, differing from the first specification, for restoring the grinding profile 14 of the grinding tool 2, and wherein the first dressing region 3 is of a larger volume than the second dressing region 4.

[0054] The dressing apparatus 1 is of a substantially cuboidal configuration, wherein the length of the dressing apparatus 1 is denoted by reference 6, the width is denoted by reference 7 and the thickness by reference 8.

[0055] The dressing apparatus 1 has a longitudinal axis 5. The two dressing regions 3 and 4 are arranged in succession in the direction of the longitudinal axis 5.

[0056] In accordance with a second preferred embodiment shown in FIG. 2b the dressing apparatus 1, in comparison with the first preferred embodiment, has an additional holding region 9 for holding the dressing apparatus 1 when dressing the grinding tool 2 wherein the holding region 9 is of an abrasive grain-less nature.

[0057] Naturally the dressing apparatus 1 in accordance with the first preferred embodiment can also be held in the dressing operation, more specifically for example at the dressing region 3, as can be seen inter alia from FIG. 3.

[0058] In the embodiment shown in FIG. 3 the feed device 16 has a magazine 17 for two dressing apparatuses 1 which are arranged in the magazine 17 in succession in the direction of the longitudinal axis of the dressing apparatuses 1. One of the dressing apparatuses 1 projects by a distance from the feed device 16. That dressing apparatus 1 is now used firstly for dressing the grinding tool 2, more specifically until the dressing apparatus 1 is used up to such an extent that it can no longer be held in the feed device 16. Thereafter the dressing apparatus 1 arranged therebehind is used for dressing the grinding tool 2. The empty location which thereby occurs in the magazine 1 can be filled up by a further dressing apparatus 1.

[0059] In the embodiment shown in FIG. 4a the feed device 16 includes a magazine 17 which, in comparison with the magazine shown in FIG. 3, has on the one hand a loading device 27 for re-loading the dressing apparatuses 1 as well as an actuator 25 for the forward feed of the dressing apparatuses 1 in the direction of the grinding tool 2 to be dressed. In the illustrated situation dressing apparatuses 1 according to the second preferred embodiment are disposed in the magazine 17. Alternatively or supplementally dressing apparatuses 1 according to the first preferred embodiment can also be arranged in the magazine 17.

[0060] In addition there is provided a catch device 29 in which residues, which have not been used, of the dressing apparatuses 1 can be collected. If this involves dressing apparatuses 1 according to the second preferred embodiment the residues substantially consist of the holding regions 9 of the dressing apparatuses 1. If dressing apparatuses 1 according to the first preferred embodiment are involved then the residues substantially consist of pieces of the dressing regions 3 and/or 4.

[0061] FIG. 4b shows an embodiment in which the feed device 16 is displaceable in the direction of the grinding tool 2 or in the reverse direction by way of a manual feed means 18, for example in the form of a spindle drive.

[0062] FIG. 4c shows an embodiment in which the dressing apparatuses 1 can be conveyed into an active dressing position from the magazine 17 fully automatically by means of an actuator 25 which is actuated by an automatic delivery device. In addition there is provided a detection device 24 with which the state of dressing apparatuses 1 in the magazine 17 can be detected. Finally there is provided an open-loop and/or closed-loop control device 20 which communicates at least with the detection device 24 and the automatic delivery device 19.

[0063] FIG. 5 shows a diagrammatic enlarged view of a part of a dressing apparatus 1. The dressing region 4 includes a specification for restoring the grinding profile of a grinding tool, wherein that specification involves a porosity in the range of 10 to 15 percent by volume and a mixture of white corundum and pink corundum and/or red corundum as abrasive grain of a grain size of about 55 mesh. The dressing region 3 includes a specification for sharpening the grinding profile of a grinding tool, wherein that specification involves a mean pore size of about 350 m and white corundum as the abrasive grain of a grain size of about 180 mesh.

[0064] FIG. 6a diagrammatically shows the dressing step of profiling a grinding tool 2 with a dressing apparatus 1, in which case the grinding tool 2 comes into contact with the dressing region 4. In that situation the dressing region 4 is used up until the grinding tool 2 comes into contact with the dressing region 3 (see FIG. 6b) and the sharpening dressing step automatically takes place. It is appropriate for the method step of restoring the grinding profile of a grinding tool to be repeated at a frequency N1 and for the sharpening method step to be repeated at a frequency N2, wherein N1<N2.

[0065] The change from restoring the grinding profile to sharpening is also shown once again diagrammatically in the upper part of FIG. 7. The lower part of FIG. 7 shows the option whereby the grinding tool 2 can be used a plurality of times for grinding at least one workpiece 15, preferably a glass pane, prior to the first method step 11 and/or between the first and second method steps 11 and 12 and/or after the second method step 12 and/or between an optionally provided repetition of the first or second method steps 11 and 12.