DEBURRING TOOL COMPRISING A GRINDING BELT HOLDER

Abstract

A deburring tool includes a grinding belt holder, which is formed so as to hold a grinding belt, wherein the deburring tool has a housing, in which the grinding belt holder can alternatingly carry out a linear stroking or lifting movement. The grinding belt holder has a forming tunnel, which forms a forming duct including an input and an output for the guide-through of the grinding belt, wherein a grinding belt, which, folded in the center in the longitudinal direction of the grinding belt, escapes on the output side, can be supplied to the forming duct on the input side. The forming duct has a round cross section on its input side and a slit-like cross section on its output side.

Claims

1. A deburring tool comprising a grinding belt holder, which is formed so as to hold a grinding belt, wherein the deburring tool has a housing, in which the grinding belt holder can alternatingly carry out a linear stroking or lifting movement, wherein the grinding belt holder has a forming tunnel, which forms a forming duct comprising an input and an output for the guide-through of the grinding belt, wherein a grinding belt, which, folded in the center in the longitudinal direction of the grinding belt, escapes at the output of the forming duct, can be supplied to the forming duct at its input, wherein the forming duct has a round cross section at its input and a slit-like cross section at its output.

2. The deburring tool according to claim 1, wherein the forming tunnel has a tubular, in particular cylindrical section, which starts at the input of the forming duct and which is connected to a funnel-like section, which narrows in the direction of the output of the forming duct and which ends with a rectangular cross section at the output of the forming duct, in particular merges into this funnel-like section.

3. The deburring tool according to claim 1 or 2, wherein the tubular section of the forming tunnel is formed by a tube comprising a cylindrical section.

4. The deburring tool according to claim 2, wherein the funnel-like section of the forming tunnel has two half shells (38, 40), which can be screwed together.

5. The deburring tool according to claim 1, wherein a bracing, which escapes at the output of the forming duct, is arranged within the forming tunnel, in particular within the funnel-like section, wherein the bracing only partially fills the slit-like cross section at the output of the forming duct in such a way that the grinding belt places itself around the bracing.

6. The deburring tool according to claim 5, wherein the bracing is formed as sheet metal strip with consistent thickness, in a flat or bent manner, in particular bent in the transverse direction of the bracing, with a constant or variable radius, which is aligned perpendicular to the plane of the sheet metal strip or that the bracing is formed with a thickness varying in the transverse direction of the bracing, in particular a thickness decreasing towards one of its longitudinal edges.

7. The deburring tool according to claim 1, wherein the grinding belt holder can be driven pneumatically within the housing to carry out the alternating stroking or lifting movement, wherein a first chamber and a second chamber, to which compressed air can be applied and which can be ventilated as well as purged, are formed in the housing, wherein both chambers are separated from one another by means of a displaceable separating wall, which is rigidly connected to the forming tunnel, in particular its tubular section.

8. The deburring tool according to claim 1, wherein the grinding belt holder can be driven electromagnetically within the housing to carry out an alternating stroking or lifting movement, wherein the housing has a magnetic coil, and a part of the grinding belt holder, in particular the forming tunnel, forms the magnetic armature.

9. The deburring tool according to claim 1, further comprising a machine housing, which also accommodates a grinding belt, which is rolled up to form a grinding belt roll, wherein the grinding belt can be supplied to the input of the forming duct, in particular guided via a deflection roller.

10. The deburring tool according to claim 1, further comprising a clamping means for clamping, removing, and pressing together the grinding belt and/or a cut-off means, which has a cutting tool for cutting off the grinding belt.

11. A deburring machine comprising a deburring tool according to claim 1, further comprising a multiaxially controlled robot arm or movable axes of a portal machine or movable axes of a CNC milling machine, at which the deburring tool is arranged.

12. The deburring machine according to claim 11, further comprising a clamping means, which is arranged outside of the deburring tool, for clamping, removing, and pressing together the grinding belt, and/or a cut-off means, which is arranged outside of the deburring tool and which has a cutting tool for cutting off the grinding belt.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Further developments of the invention follow from the claims, the description, and the drawings. The above-mentioned advantages of features and of combinations of several features are exemplary and can take effect alternatively or cumulatively, without the advantageous having to mandatorily be attained by embodiments according to the invention. Further features can be gathered from the drawings, in particular the illustrated geometries and the relative dimensions of several components to one another as well as the relative arrangement and operative connection thereof. The combination of features of different designs of the invention or of features from different claims is likewise possible, notwithstanding the selected dependencies of the claims, and is hereby proposed. This also relates to such features, which are illustrated in separate drawings or which are mentioned in the description thereof. These features can also be combined with features of different claims. Features listed in claims can likewise be foregone for further embodiments of the invention.

[0030] Thus, other objects and features of the invention will become apparent from the following detailed description considered in connection with the accompanying drawings. It is to be understood, however, that the drawings are designed as an illustration only and not as a definition of the limits of the invention.

[0031] In the drawings,

[0032] FIG. 1A-E show an exemplary embodiment of a deburring tool according to the invention in different views, namely

[0033] FIG. 1A in a view from the side,

[0034] FIG. 1B in a view from the top,

[0035] FIG. 1C in a view along the cutting plane illustrated in FIG. 1B,

[0036] FIG. 1D in a view from the front,

[0037] FIG. 1E in a view from the rear, and

[0038] FIG. 2 shows the deburring tool shown in FIGS. 1A to 1E comprising a grinding belt, which is unrolled from a grinding belt roll and which is guided through the deburring tool, in a schematically illustrated machine housing at a robot arm.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0039] FIGS. 1A to 1E show an exemplary embodiment of a deburring tool 10 according to the invention comprising a grinding belt holder 12, which is movably arranged in a housing 14. The grinding belt holder 12 can carry out a linear stroking or lifting movement 15, whereby the lift is limited by means of two stops. In FIGS. 1A to 1C, the grinding belt holder 12 is located at the left stop. The linear stroking or lifting movement takes place alternatingly, i.e. the grinding belt holder 12 moves from the left to the right and back again in FIGS. 1A to 1C. This alternating linear stroking or lifting movement takes place with a frequency of 5-20 lifts per second. The frequency can be set.

[0040] The grinding belt holder 12 has a forming tunnel 16, which forms a forming duct 18 comprising an input 20 and an output 22 for the guide-through of a grinding belt 24 illustrated in FIG. 2. The input 20 of the forming duct 18 is simultaneously also the input of the forming tunnel 16. The output 22 of the forming duct 18 is likewise simultaneously the output of the forming tunnel 16. The forming tunnel 16 forms the outer limitation of the forming duct 18.

[0041] As shown in FIG. 2, the grinding belt 24 is unrolled from a grinding belt roll 26 and is supplied to the input 20 of the forming duct 18 via a deflection roller 28. In the case of a deviating arrangement of the grinding belt roll 26, the deflection roller 28 can be forgone. However, more than one deflection roller can also be provided in order to supply the grinding belt to the input 20 of the forming duct 18.

[0042] On the grinding belt roll 26, the grinding belt 24 has twice the width as at the output 22. This is so because the grinding belt 24 is formed in the forming duct 18 and is thereby folded in the center in the longitudinal direction of the grinding belt 24, i.e. along the center line of the grinding belt 24. This means that a folding edge is created in the center in the longitudinal direction of the grinding belt 24. This has the result that, at the output 22, the grinding belt only still has half the width as on the grinding belt roll 26.

[0043] The grinding belt 24 has a top side, which is provided for grinding, as well as usually a bottom side, which is not provided for grinding.

[0044] By folding the grinding belt 24 along its center line, the top side of the grinding belt 24, which is provided for grinding, faces in both directions. The folded grinding belt 24 can thus be used for grinding from both sides.

[0045] At its input 20, the forming duct 18 has a tubular, in particular cylindrical section 30, which merges into a funnel-like section 32. The funnel-like section 32 has a cross section, which changes to the output 22 and which increasingly constricts on the one hand and changes the shape from round to rectangular on the other hand, so that the cross section is formed in a slit-like manner at the output 22.

[0046] If the grinding belt 24 is pushed through from the input 20 to the output 22, it is folded over automatically along its center line.

[0047] The tubular section 30 has fastening means 34, for example a screw, by means of which the funnel-like section 32 can be firmly connected to the tubular section 30.

[0048] The funnel-like section 32 comprises two half shells 38, 40, which can be screwed together by means of a screw 36.

[0049] A bracing 42 is preferably (albeit not necessarily) arranged within and/or between the two half shells 38, 40 and thus within the forming tunnel 16, in particular within the funnel-like section 32, around which the grinding belt 24 can place itself. The bracing 42 provides additional stability to the grinding belt and makes it possible to increase the grinding pressure. The bracing 42 is preferably formed from sheet steel, in particular formed as sheet metal strip with consistent thickness.

[0050] In a non-illustrated alternative, the bracing is formed with varying thickness. The bracing thereby tapers towards its upper longitudinal side. This means that the thickness of the bracing decreases in the transverse direction of the bracing or towards the top in the illustrations according to FIGS. 1A, 1C, and 2. The bracing then preferably has a V-shaped or triangular cross section, respectively, whereby the pointed edge in the illustrations according to FIGS. 1A, 10, and 2 is then the upper edge of the bracing 42. The grinding belt then places itself onto the two outer surfaces of the V shape via this pointed edge.

[0051] If the grinding belt 24 has sufficient stiffness and/or the grinding pressure remains below a threshold value, the bracing 42 can be forgone.

[0052] The bracing 32 has several bores, wherein two bores 44, 46 are provided for receiving positioning pins, which engage with one or both of the half shells 38, 40. A further bore 48 serves for the guide-through of the screw 36.

[0053] A first chamber 50 and a second chamber 52, which can be ventilated with compressed air, are provided in the housing 14. For this purpose, the first chamber 50 is connected to a compressed air connection 54, while the second chamber 52 is connected to a further compressed air connection 56.

[0054] Both chambers 50, 52 are separated from one another by means of a separating wall 58, which can be displaced in the stroke or lifting direction. The separating wall 58 is rigidly connected to the forming tunnel 16, for example by means of pressing or adhesion or by means of a positive connection.

[0055] The compressed air connections 54, 56 are connected to a compressed air control unit (not illustrated) via compressed air lines, which ensure a ventilation and purging of the first chamber 50 and of the second chamber 52, namely alternatingly according to the frequency of the stroking or lifting movement.

[0056] The separating wall 58 is sealed against the housing 14 by means of an annular seal 60. Two further annular seals 62, 64, which seal the housing 14 against the forming tunnel 16, are further provided.

[0057] The housing 14 includes a housing cover 66, which is fixed to the remaining housing 14 by means of screws 68, in particular grub screws.

[0058] FIG. 2 shows that the deburring tool 10 is arranged in a machine housing 70, which also receives the grinding belt roll 26 and the deflection roller 28. The machine housing 70 advantageously forms the end of a multiaxially controlled robot arm 72. Machine housing 70 and robot arm 72 are only illustrated schematically in FIG. 2.

[0059] The deburring tool 10 can be guided towards virtually any positions of a workpiece by means of the robot arm 72. The grinding belt holder 12 is set into an alternating linear stroking or lifting movement by means of compressed air or another drive, for example an electromagnetic drive, so that the grinding belt 24 is moved back and forth in order to debur workpieces.

[0060] As soon as a deburring process is completed, the deburring tool is guided to a clamping means. The grinding belt is clamped there, a piece of the grinding belt is removed from the roll and is cut off by means of a cut-off means. The grinding belt 24 is subsequently clamped again around the bracing 32 by means of the clamping means and is thus provided with a folding edge.

[0061] As a whole, the invention makes it possible to provide a deburring machine which comprises a deburring tool and which provides for an automatic replacement of the grinding belt in an automated process in order to obtain high machining qualities.

[0062] The invention is in fact preferably used during the deburring of multipoles, in particular quadrupoles, for mass spectrometers. In particular slits between electrode sections are thereby deburred after the grinding of the electrodes. The invention is preferably used when surfaces, which are machined in a highly precise manner, so-called precision surfaces, must not be damaged, such as, for example, the machined precision surfaces of multipoles of mass spectrometers. The deburring tool according to the invention provides for a machining of only the edge with the burr, in that the grinding belt is placed only onto this edge and thus only acts on this edge. The grinding belt thereby does not come into contact with the precision surface and can thus not damage it.

[0063] However, the invention can also be used to remove burrs created during the grinding of drills and/or milling cutters, i.e. to debur drills or milling cutters, respectively.

[0064] Although only a few embodiments of the present invention have been shown and described, it is to be understood that many changes and modifications may be made thereunto without departing from the spirit and scope of the invention.

[0065] The following reference numerals are used in the figures: [0066] 10 deburring tool [0067] 12 grinding belt holder [0068] 14 housing [0069] 15 stroking or lifting movement [0070] 16 forming tunnel [0071] 18 forming duct [0072] 20 input of the forming duct and forming tunnel [0073] 22 output of the forming duct and forming tunnel [0074] 24 grinding belt [0075] 26 grinding belt roll [0076] 28 deflection roller [0077] 30 tubular section of the forming duct [0078] 32 funnel-like section of the forming duct [0079] 34 fastening means [0080] 36 screw [0081] 38 half shell [0082] 40 half shell [0083] 42 bracing [0084] 44 bore [0085] 46 bore [0086] 48 bore [0087] 50 first chamber [0088] 52 second chamber [0089] 54 compressed air connection [0090] 56 compressed air connection [0091] 58 separating wall [0092] 60 annular seal [0093] 62 annular seal [0094] 64 annular seal [0095] 66 housing cover [0096] 68 grub screw [0097] 70 machine housing [0098] 72 robot arm