CLAMPING MEANS SYSTEM CAPABLE OF AUTOMATION

Abstract

A clamping means system including a bearing device and clamping vices, which fit into the bearing device and respectively have on their base area machine coupling system and on their side faces and flanks a bearing receiving contour and a gripping receiving contour. The bearing receiving contour has the greatest play; the fit between the gripper and the gripper receiving contour is of moderate precision, while the precision of the machine coupling system is the greatest. The clear functional separation between the machine coupling system and the bearing receiving contour or gripper receiving contour allows a reliable low-cost system to be constructed. Furthermore, in the case of mixed partly automated systems, in which parts of the handling tasks are performed by the operator and other parts are performed by gripping robots, the handling is possible in an easy and intuitive way.

Claims

1. Clamping vice (10) for workpieces (11), wherein the clamping vice (10) comprises: A base surface (19) on which is arranged a machine coupling system (20); At least two workpiece clamping jaws (13, 14) which are arranged on the side of the clamping vice (10) opposite the base surface (19) and of which at least one is supported so as to be movable toward the other and away from the other; A bearing receiving contour (37) located outside the base surface (19) on a first side of the clamping vice (10); and, A gripper receiving contour (43) located on a second side of the clamping vice (10) opposite the first side.

2. Clamping vice according to claim 1, characterized in that the bearing receiving contour (37) comprises two grooves (41, 42) that extend parallel to each other along two flanks (39, 40) of the clamping vice (10), said flanks facing away from each other.

3. Clamping vice according to claim 2, characterized in that the grooves (41, 42) have a trapezoidal or a triangular cross-section.

4. Clamping vice according to claim 2, characterized in that the grooves (41, 42) have a changing cross-section along their length.

5. Clamping vice according to claim 1, characterized in that the gripper receiving contour (43) comprises two gripper grooves (44, 45) that extend parallel to each other along two flanks (39, 40) of the clamping vice (10), said flanks facing away from each other.

6. Clamping vice according to claim 5, characterized in that the gripper grooves (44, 45) of the gripper receiving contour (43) have a trapezoidal or a triangular cross-section.

7. Clamping vice according to claim 5, characterized in that the grooves (44, 45) of the gripper receiving contour (43) have a changing cross-section along their length.

8. Clamping device according to claim 2, characterized in that the flanks (39, 40) are straight surfaces in groove direction.

9. Clamping vice according to claim 1, characterized in that both workpiece clamping jaws (13, 14) can be moved by a clamping mechanism in opposite direction relative to each other.

10. Clamping means system (52) with several clamping vices according to claim 1, comprising: a cart (29, 30) that has several bearing contours (31) arranged at a uniform height and oriented in the same way, said bearing contours being disposed to receive the clamping vices (10) with the upward-directed gripper receiving contour (43) and the downward-oriented bearing receiving contour (37).

11. Clamping means system according to claim 10, characterized in that the bearing contours (31) are directed upward and are arranged in a grid.

12. Method for handling workpieces by means of a clamping means system (52) according to claim 10, Wherein the bearing contours (31) of the cart (29, 30) are loaded with clamping vices (10) that are configured the same with respect to each other, in which clamping vices workpieces (11) are being held; and Wherein the cart (29, 30) is placed in the access region of a gripping robot that grasps the clamping vices (10)—with the workpieces (11) held therein for processing—at the gripper receiving contour (43) and transfers them for processing of the workpiece (11) into a processing machine, and—after completed processing—deposits them again on a bearing contour (31) of the cart.

13. Method according to claim 12, characterized in that, with the use of this method, the bearing contours (31) and the bearing receiving contours (37) are brought into and out of engagement due to a vertical movement.

14. Method according to claim 12, wherein the clamping vice (10) provided with a workpiece is pivoted on its path from a bearing device (28) to a machine tool by a right angle or by an acute angle about a horizontal axis in order to transfer the base surface (19) of the clamping vice (10) that is laterally oriented in a bearing position into a downward-oriented horizontal processing position, and vice versa.

15. Method according to claim 14, wherein the gripping robot grasps the clamping vice (10) at the gripper receiving contour (43) laterally relative to an axis extending through a balance point of the clamping vice, perpendicular to its base surface (19).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Further details of advantageous embodiments of the invention are the subject matter of the claims and of the description and the associate drawings. They show in

[0026] FIG. 1 a schematic side view of a clamping vice according to the invention;

[0027] FIG. 2 a group of clamping vices on a bearing device loaded with workpieces;

[0028] FIG. 3 a perspective illustration of a transport cart with a clamping vice bearing device, in a first embodiment;

[0029] FIG. 4 a transport cart, in a modified embodiment of a clamping vice bearing device;

[0030] FIG. 5 a perspective illustration of a detail of the clamping vice bearing device according to FIG. 4; and

[0031] FIG. 6 the clamping vice on the clamping vice bearing device and associate grippers.

DETAILED DESCRIPTION OF THE INVENTION

[0032] FIG. 1 is a schematic illustration of a clamping vice 10 that holds a tool 11 available for processing in a not illustrated machine tool. The clamping vice 10 comprises a base body 12 on which are provided at least two clamping jaws 13, 14 that are disposed to hold the workpiece 11 between them. At least one of the clamping jaws 13, 14 is held so as to be movable on the base body 12 toward the other clamping jaw and away therefrom. In a preferred embodiment, the two clamping jaws 13, 14 can be moved toward each other and away from each other. In doing so, a not specifically illustrated helical spindle or another clamping means is disposed for moving and tightening the clamping jaws 13, 14, as well as for releasing them.

[0033] For clamping the workpiece 11, the clamping jaws 13, 14 may have appropriate pressure surfaces 15, 16 that are flat and oriented parallel to each other. Furthermore, the clamping jaws 13, 14 may have support surfaces 17, 18 that are located in a common plane for positioning the workpiece 11. The pressure surfaces 15, 16 may also be provided with a profile that fits in a specified profile of the workpiece 11 or generates such a profile.

[0034] The clamping vice 10 is provided for the positionally accurate insertion in a machine tool. To accomplish this, the base body 12 has on its base surface 19 a machine coupling system 20 which comprises several, for example four, clamping and positioning pins 21 to 24 (see also FIG. 6). The clamping and positioning pins 21 to 24 have a basic cylindrical form and extend at a right angle away from the base surface 19. They are oriented parallel to each other and are arranged, for example, on the corners of a rectangle or square. Each clamping and positioning pin 21 to 24 has a continuous peripheral trapezoidal groove that is used by a machine-side tightening device in order to apply to the respective clamping and positioning pin 21 to 24 an axial pulling force directed away from the base surface 19 in order to clamp the base surface 19 against a positioning surface of the machine tool. At the same time, such a tightening device is disposed to displace the clamping and positioning pins 21 to 24 radially outward in such a manner that the lower head-like ends of the clamping and positioning pins 21-24 without trapezoidal grooves push—at the corresponding reference surfaces 25, 26—into the receiving bores of the processing machine. The corresponding clamping forces F and the reference surfaces 25, 26 of the processing machine are schematically illustrated in FIG. 1. This machine coupling system 20 has proved to be extremely precise and allows the clamping of clamping vices 10 with repeat accuracy in the range of a hundredths of a millimeter all the way to a thousandths of a millimeter.

[0035] Preferably, the clamping vice 10 is part of a clamping means system 27 that comprises a bearing device 28 for an ordered receiving of a larger number of clamping vices 10. These are configured the same among each other and correspond to the description hereinabove. Each clamping vice 10 may be provided with a workpiece 11 that, for example, is held available for processing in a processing machine. The clamping vices 10 are arranged on the bearing device 28, preferably in a rectangular grid, in which case the base surfaces 19 of the individual clamping vices 10 are arranged at an angle—for example, a right angle—relative to a horizontal surface defined by the bearing device 28. Regarding this, FIG. 3 illustrates a transport cart 30 whose bearing device 28 holds the clamping vice 10 with a vertically oriented base surface 19. FIG. 4 shows an alternative cart 30 whose bearing device 28 holds the clamping vices 10 with a base surface 19 oriented in a vertically inclined manner. Whichever embodiment is implemented preferably depends, for example, on the size, shape and weight of the workpieces 11 held in the clamping vices 10.

[0036] FIGS. 5 and 6 give a better illustration of the design of the bearing device 28. The bearing device 28 comprises a bearing contour 31 for the form-locking accommodation of the clamping vice 10. To do so, the bearing contour 31 has, for example, a support surface 32 and suitable bearing elements 33, 34, for example in the form of two cylindrical pins 35, 36 oriented parallel to each other and extending away from the support surface 32, or any otherwise profiled projections. The cylindrical pins 35, 36 extending at a distance from each other upward from the support surface 32 form, together with the support surface 32, the bearing contour 31 with which the clamping vice 10 can be brought into or out of engagement by means of a vertical movement. To accomplish this, the clamping vice 10 has a matching bearing receiving contour 37 that fits on the bearing contour 31 in a form-locking manner.

[0037] The bearing receiving contour 37 is formed on the base body 12. Said contour extends, starting from is lower side surface 38 in bearing position, over sections of the two flanks 39, 40 of the base body 12. Thus it is applied to the lower end of the base body 12 in the bearing position. In the present exemplary embodiment, the bearing receiving contour 37 is formed by two grooves 41, 42 that extend parallel to each other and may have a trapezoidal or triangular cross-section, for example. In doing so, the size and arrangement of the grooves 41, 42 are dimensioned in such a manner that the base body 12 can be connected to the bearing contour 31 with minimal play, i.e., that it fits between the cylindrical pins 35, 36. In doing so, the lower side surface 38 rests on the support surface 32. In this position, all the clamping vices 10 are held on the transport cart 29 or 30.

[0038] In order to be able to supply the clamping vices 10 with the workpieces 11 thereon, individually or in groups, to a processing machine and to be able to deposit the processed workpieces 11, together with their clamping vices 10 again on a transport cart 29, 30, the clamping vices 10 have on their upper end—in bearing position—a gripper receiving contour 43. This comprises, for example, two gripper grooves 44, 45 that extend away from a second side surface 46 located opposite the first side surface 38 over parts of the two flanks 39, 40 of the base body 12. In doing so, the gripper grooves 44, 45 may be designed like or similar to the grooves 41, 42 belonging to the bearing receiving contour 37. However, it is also possible to use other forms of grooves in order to prevent operators from inadvertently placing the clamping vices having the gripper receiving contour 43 onto the bearing contour 31. Preferably, the bearing contour 31 and the gripper receiving contour 42 are incompatible to this extent.

[0039] In the case of the gripper grooves 44, 45 a form-locking association with a gripper 47 comprising gripper pliers with two gripper fingers 48, 49 that fit into the gripper groove 44, 45 or other gripper recesses in a form-locking manner is essential. Preferably, the gripper fingers 48, 49 and the associate complementary structure formed by the gripper grooves 44, 45 or sections thereof are configured so as to be self-centering, so that the gripper 47 is able to grip the clamping vice 10 in a highly accurate manner. For example, in doing so, the fingers 48, 49 reach into the griper grooves 44, 45, in which case nose-like projections 50, 51 formed on the gripper fingers 48, 49 reach into the recesses of the gripper grooves 44, 45. As a result of this, the clamping vice 10 is coupled relative to the vertical position as well as angularly immovable to the gripper 47 and can thus be lifted off the bearing contour 31 and placed on said bearing contour. Furthermore, during transfer from the transport cart 29, 30 to the processing machine it can be pivoted back out of its vertical position into the horizontal position and back again.

[0040] The eccentric seat of the clamping pliers 47 on the clamping vice 10 has the result that a line dropped from the balance point (the unit consisting of workpiece and clamping vice) onto the base surface 12 does not extend between the gripper fingers 44, 45. This means, that the clamping vice 10 and the workpiece 11 located thereon generate a considerable momentum due to their weight and the eccentric contact of the clamping pliers 47, which momentum can be reliably transmitted due to the form-locking action between the gripper fingers 48, 49 and gripper groove 44, 45. The same applies to the insertion of the positioning and clamping pins 21-24 into the processing machine and the movement of said machine.

[0041] The clamping means system 52 comprising one of the carts 29, 30 and the clamping vices 10 is inserted as follows:

[0042] First, the clamping vices 10 are loaded manually or with a suitable device with workpieces 11 and are then arranged on a corresponding bearing device 28 as can be inferred from FIGS. 2 to 4. If the bearing device 28 is arranged on a cart 29 or 30, it is now moved into the access region of a gripping robot, as a result of which the workpieces 11 are made available for processing. The gripper 47 of the gripping robot can now blindly grasp a clamping vice 10—with the cart position being in a fixed or in a non-specific cart position—or grasp the clamping vice 10—by means of suitable control devices, for example, camera-controlled—and pull it upward off the bearing device 28. The grasping of the clamping vice 10 is made particularly easy if the gripper grooves 44, 45 have a triangular or trapezoidal cross-section. Furthermore, a correct vertical position of the gripper 47 relative to the clamping vice 10 is facilitated especially if the gripper 47 is designed so as to be self-centering relative to the gripper receiving contour 43. To do so, the projections 50, 51 may be conical, spherically curved, have the form of a cone or a truncated cone or be configured in another manner so as to be self-centering.

[0043] After coupling the gripper 47 to the clamping vice 10, it is removed from the bearing device 28 and supplied to the machine. In doing so, the clamping and positioning pins 21 to 24 are inserted in corresponding receiving openings on the machine and tightened therein. Consequently, the clamping vice 10 is held with the greatest positional accuracy. Now the gripper 47 can be uncoupled and removed from the working area of the machine tool.

[0044] Following completed processing, the gripper 47 can again grasp the clamping vice 10 on the gripper receiving contour 43 and, after releasing the machine coupling system 20, move the clamping vice out of the machine tool and deposit it on the bearing device 28. This is accomplished in that the bearing receiving contour 37 is inserted in the bearing contour 31.

[0045] In this manner it is possible for the machine tool and for the gripping robot to independently—without operator—process the workpieces made available on the cart 29 or 30.

[0046] The clamping means system 52 described so far can be made from known resources and with minimal expense. Only appropriate carts 29, 30 with bearing devices 28 need to be provided. Existing clamping vices can subsequently be provided with the bearing receiving contour 37 and the gripper receiving contour 43, for example in that the appropriate grooves 41, 42 and gripper grooves 44, 45 are milled into the base body 12 based on measurements specified by the manufacturer of the bearing device 28 and the gripper 47, respectively. The specified dimensions of the manufacturer of the clamping vices 10 may also be made available as a data set.

[0047] A clamping means system 52 according to the invention comprises a bearing device 28 and clamping vices 10, which fit into this bearing device 28 and respectively have on their base area a machine coupling system 20 and on their side faces 38, 46 and flanks 39, 40 a bearing receiving contour 37 and a gripper receiving contour 43. The bearing receiving contour 37 has the greatest play; the fit between the gripper 47 and the gripper receiving contour 43 is of moderate precision a few tenths of a millimeter, while the precision of the machine coupling system 20 is the greatest a deviation of a few hundredths to a few thousandths of a millimeter. The clear functional separation between the machine coupling system 20 and the bearing receiving contour 43 or gripper receiving contour 37 allows a reliable low-cost system to be constructed. Furthermore, in particular in the case of mixed partly automated systems, in which parts of the handling task are performed by the operator and other parts are performed by gripping robots, the handling is possible in an easy and intuitive way.

LIST OF REFERENCE SIGNS

[0048] 10 Clamping vice [0049] 11 Workpiece [0050] 12 Base Body [0051] 13 First clamping jaw [0052] 14 Second clamping jaw [0053] 15 First pressure surface [0054] 16 Second pressure surface [0055] 17 First support surface [0056] 18 Second support surface [0057] 19 Base surface [0058] 20 Machine coupling system [0059] 21-24 Clamping and positioning pins [0060] F Clamping forces [0061] 25,26 Reference surfaces [0062] 27 Clamping means system [0063] 28 Bearing device [0064] 29 Transport cart [0065] 30 Transport cart [0066] 31 Bearing contour [0067] 32 Support surface [0068] 33 First bearing element [0069] 34 Second bearing element [0070] 35 First cylindrical pin [0071] 36 Second cylindrical pin [0072] 37 Bearing receiving contour/clamping vice receptacle [0073] 38 First side surface [0074] 39 First flank [0075] 40 Second flank [0076] 41 First groove [0077] 42 Second groove [0078] 43 Gripper receiving contour [0079] 44 First gripper groove [0080] 45 Second gripper groove [0081] 46 Second side surface [0082] 47 Gripper [0083] 48,49 Gripper fingers [0084] 50,51 Projections [0085] 52 Clamping means system