SK287051B6 - Workpiece clamping device - Google Patents

Abstract

A workpiece clamping device including a handle and a holder. Both part (1, 3) intended for fixing against each another have matched surfaces (4, 5) bearing in working position against each other and being clamped against each another through the mediation of fixing means extending transversely or in the right angle to a contact plane of these matched surfaces (4, 5). Matching projections (9) preventing mutual shift of the parts (1, 3) coupled to each another transversely to the fixing means, optionally inside the contact surface of the matched surfaces (4, 5), are additionally arranged on the fixing place to the matching surfaces (4, 5) fixing mutual position. These projections (9) exactly center both the parts (1, 3) transversely to the contact plane at least in the direction (X) and in the direction (Y). At the same time, the matching projections (9) are arranged on one of the parts (3) between the matched surfaces (4, 5), and the other part (1), intended for connection therewith has in the corresponding points a matching recess (10) that engage with the projection when the parts are fastened to each another. Said matching projections (9) are arranged in a region (11) of the part (3) that can deflect or is elastic in axial direction against deformation force applied thereto.

Description

Technical field

BACKGROUND OF THE INVENTION The invention relates to a workpiece clamping device with a holder and a support, the two parts to be fastened to each other having mating surfaces abutting each other in the working position and clamped together by fastening means extending transversely or at right angles to the contact plane of the mating surfaces. wherein, at the fastening point, in addition to the fitting surfaces securing the axial position relative to each other, fitting projections are provided which prevent the interconnected parts from moving relative to each other across the fastening means, or inside the contact plane of the fitting surfaces. at least in the X and Y directions.

BACKGROUND OF THE INVENTION

Such clamping devices are known and serve, for example, to fit the holder and the electrode or the electrode to the clamping sleeve precisely.

A clamping device is also known from EP 0 111 092 B2, in which a recess plate is arranged between two mutually fastened parts for centering in the X and Y directions, wherein the edges of the recesses of the centering projections of one part are opposite to each other. yielding until both parts touch on the anticipated mating surfaces in order to also provide alignment and refinement in the Z axis, i.e. in the longitudinal central axis of the entire arrangement. Accordingly, the intermediate plate is required in order to achieve accurate contact, refinement and alignment in the three different directions mentioned above, but the intermediate plate increases the manufacturing and assembly costs as well as the overall height of the assembly.

The essence of you finding

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a clamping device of the aforementioned type which can be precisely centered or aligned in both the X and Y directions, while at the same time precisely matching each other in the Z direction, in order to be additionally treated and to produce, or fit precisely, the intermediate sheet. In doing so, any other auxiliary contact portion should also be prevented from being fitting accurately while centering or rectifying. In the operating position, the fitting surfaces are to be firmly secured to one another without the risk of the two parts being fastened to one another being at the same time centered or rectified in the X and Y directions, i.e. the fitting projections should be fully engaged with each other the contact surfaces are superimposed on each other, but are not intended to prevent the end contact of these mating surfaces.

A solution to this seemingly contradictory task in a workpiece clamping device with a holder and a carrier, the two parts to be fastened to each other, have mating surfaces abutting each other in the working position and clamped together by fastening means extending transversely or at right angles to the contact in the plane of the mating surfaces, the mating projections are provided in addition to the mating surfaces fixing the axial position to the mating surfaces, preventing the mating portions of the interconnected parts transversely to the fastening means or inside the contact plane of the mating surfaces, respectively. to this contact plane at least in the X direction and in the Y direction, according to the invention, the fitting projections are arranged on one of the parts between the fitting surfaces and the other part to be connected thereto has corresponding and that the fit projections are provided in the axial direction against the deformation force of the resiliently deflectable or yielding region of the part provided therein.

If the parts so arranged are fastened to each other and clamped to one another, the engaging lugs into the fit recesses before the contact surfaces engage one another. By increasing the axial clamping force or the clamping force, it is nevertheless possible, without the intermediate sheet or the like, to contact each other in the desired manner with each other, so that the angular alignment of the two parts relative to one another is also prevented or rectification in the X direction and in the Y direction somewhat allow for these driving regions in the clamping direction. Thus, the mating portions of the mating or yielding regions of the mating protrusions may allow the contact surfaces to be firmly seated when the mating protrusions and mating recesses engage each other rigidly in their end position without the need for any additional portions.

According to a preferred embodiment of the invention, the fitting surfaces have a spacing which is equal to or less than the yieldability of the deflectable yield area when the fitting projections engage the fitting recesses.

The fitting protrusions are preferably wedge-shaped or arc-shaped or circular-arc-shaped or have a trapezoid or semicircular-shaped cross-section, and the fitting recesses have oppositely arranged opposing surfaces.

Advantageously, an adjacent recess, cavity and / or slot extending parallel to the mating surfaces is provided in the clamping direction, separating the region of the portions comprising the mating projection from the remaining region of these portions, and that the dimension of the cavity, recess or slot extending in the direction of clamping. is resiliently shrinkable by the clamping process.

The recess, cavity or slot on the portion comprising the fitting lugs is preferably arranged downstream of these fitting lugs.

The fitting protrusions preferably have a longitudinal shape and extend from the edge of the portion containing them, in particular towards the center thereof and end before this center, and that the fitting recesses are oriented in the same way and open at the edge.

The fitting protrusions are preferably prismatic centering bars which are evenly spaced around the periphery of the respective part, their longitudinal axes extending radially over the part of the circular section and extending perpendicular to the flat side sides of the part in the rectangular section.

The fitting projections in the form of a bar and the fitting recesses are preferably arranged on mutually orthogonally intersecting lines on the fitting surfaces of both parts.

The portion comprising recesses or slots for forming the flexible region preferably has a substantially centrally arranged recess in which the recesses or slits openly open and that the slits or recesses open openly in the direction of the lateral sides.

The fitting protrusions preferably extend all over the area provided with the slot from the outer side to the recess.

The lateral spacing or length of the slot or recess transversely to the fit of the fitting protrusions is preferably greater than the width of the fitting protrusions in this direction.

The thickness of the compliant region material between the slot or recess and the fit protrusion is preferably so large that a force of at least about 200 N for each fit protrusion is required to elastically deform the elastically yieldable area in the clamping direction.

The length of the slot or recess transversely to distribute the fitting lugs is preferably three to five times the width of the fitting lug at its base.

The recesses are preferably open on the facing protrusion or the facing recess facing away from the top or bottom and their side edge walls extend parallel to each other and / or perpendicular to their side or top or bottom side.

The at least two fitting recesses opening on two mutually opposed lateral sides preferably fuse to one another and / or are joined together into one fitting recess extending through the center.

BRIEF DESCRIPTION OF THE DRAWINGS

In the following, examples of embodiments of the invention are described in more detail with features essential to the invention in connection with the drawing. The drawings show partially schematic illustrations.

In FIG. 1 shows a view of a first embodiment of a workpiece clamping device from below, on which a tool or workpiece can be mounted, i.e. with a view of the mating surfaces arranged at the corners and the mating projections disposed therebetween.

In FIG. 2 is a cross-sectional view of the workpiece clamping device along the line II-II in FIG. First

In FIG. 3 is a cross-sectional view of the workpiece clamping device along the line III-ΠΙ in FIG. First

In FIG. 4 is a top view of a second embodiment of the workpiece clamping device.

In FIG. 5 is a cross-sectional view of the workpiece clamping device taken along the line V-V in FIG. 4th

In FIG. 6 is a top plan view of the holder for receiving the workpiece clamping device.

In FIG. 7 is a cross-sectional view of the holder taken along line VII-VII in FIG. 6th

In FIG. 8 is a cross-sectional view of the holder taken along line VIII-VIII in FIG. 6th

In FIG. 9 shows a partial cross-sectional side view of the clamping device after the workpiece clamping device and the holder are joined before contacting the fitting surfaces.

In FIG. 10 shows a side view of the mating surfaces touching each other after tightening the clamping screw, the deformation of the movable region being more clearly shown for better recognition.

DETAILED DESCRIPTION OF THE INVENTION

The clamping device for a tool or workpiece, in the exemplary embodiment of the electrode by which other workpieces can be machined, but which also must first be machined as a workpiece and constitutes the first part 1 of the clamping device, has according to FIG. 9 a central fastening screw 2, hereinafter also simply referred to as a screw 2, in order to be able to arrange said first part 1 on the holder as a second part 3, which is also called the first part 3. The two parts 1 and 3 in each working position in a common plane, the mating surfaces 4 and 5, which can be arranged according to FIG. 1, FIG. 3, FIG. 6 and FIG. 7 or additional central screw holes 7 for further fastening. Normally, however, the central hole 7 for the screw on the holder and the threaded resistor 8 on the workpiece carrier are sufficient to achieve a sufficiently secure fastening by the screw 2, since the fitting surfaces 4 and 5 lead to an exact opposite position in axial direction and across or at right angles to screw 2, if they are clamped against each other. In this case, at the fastening point, which is formed by means of faces facing one another, in addition to the mating faces 4 and 5, which oppose the axial position, the mating protrusions 9 are provided, which prevent the first part 1 and the second part 2 from moving together to the fastening means within the contact plane of the mating surfaces 4 and 5, and also the two portions 1 and 2 aligned exactly transversely to this contact plane in the X and Y directions.

For this purpose, these fitting lugs 9 are arranged between the contact surfaces on one of the parts, in the exemplary embodiment on the second part 3, and the opposite part so connected, in the embodiment first part 1, has fitting recesses 10 at corresponding places. The fitting recess 10 engages the opposite fastening of FIG. 9 and FIG. 10 are partially rigid in shape and aligned precisely with respect to each other, thus ensuring a mutually opposite rectification and centering of the two parts 1 and 3.

In this case, FIG. 9 shows an arrangement in which the fitting protrusions 9 engage rigidly in the fitting recesses 10. It can be seen that in this position, the fitting surfaces 4 and 5 have a distance from each other, i.e. they do not touch each other, so that opposite folding of the parts 1 and 3.

In order that only a stronger tightening of the fastening element, i.e. screws 2 or more screws 2, can result in the rectification and centering in the X and Y directions being maintained but also formed in the Z direction by contacting the faces 4 and 5, The projections 9 are each provided on the movable region 11 of this second part 3, which in the axial direction, i.e. in the direction of the course of the fastening screws 2, is designed to be resiliently displaceable or movable against the deformation force. It is also possible for the alignment recesses 10 to be provided additionally or instead of the alignment protrusions 9 on such a movable area 11 that the first part 1 has, but it is much more advantageous if the alignment protrusion 9 can deviate slightly in the axial direction because it is not itself deformed , which could not be completely ruled out by the fitting recess.

The fitting surfaces 4 and 5 have here, when the fitting projections 9 are engaged in the fitting recesses 10, as shown in FIG. 9, with respect to one another, which is equal to or less than the mobility of the deflectable yielding region 11. This ensures that when the fastening screw 2 is tightened in the region already in alignment with respect to each other the mating protrusions 9 and the mating recesses 10, there is such a high mobility that it is also possible to bring the mating surfaces 4 and 5 into abutment.

Thus, if the fastening screw 2 is in the position shown in FIG. 9, the movable region 11 of FIG. 10 deforms somewhat in the axial direction and, while maintaining the centering and rectification between the fitting lugs 9 and the fitting recesses 10, the fitting surfaces 4 and 5 also reach the position relative to each other, thus touching each other, thereby ensuring opposite directions of the parts 1 and 3; so rectification in the Z direction is also achieved

In the exemplary embodiment, the wedge-shaped fitting lugs 9 are made, i.e. they have a rectangular cross-section and thus taper from their base 9a in a vertical direction. The fitting recesses 10, in accordance with this shape of the fitting protrusions 9, have obliquely arranged opposing surfaces 12, which in the working position are arranged flat on the transverse cross-section of the fitting protrusions 9b, as shown clearly in FIG. 10. This allows for the best possible centering and rectification in the direction of the separation or contact plane between the two parts 1 and 3, i.e. transversely to the Z axis or to the central axis and to the fastening screw 2.

Alternatively, the fitting protrusions 9 could also have a cross-section in the form of a circular arc or semi-circle, which would cooperate with either the inclined opposing faces 12 or analogously shaped opposing faces 12.

The adaptability of the ductile region 11 is formed by the fact that in the embodiment according to FIG. 4 and 5, a recess 13a or a cavity is provided in the clamping direction with the flange 9, respectively, in the embodiment according to FIG. 2 and FIG. 3, FIG. 9 and FIG. 10, a slot 13 arranged parallel to the mating surfaces 5, this arrangement separates the adaptation region 11 of the second part 3, containing the corresponding mating projection 9, in particular in one-piece connection from the other region of the second part 3. In particular, FIG. 10, it is clear that the dimension of this slot 13 provided in the clamping device, i.e. the slot width w, is resiliently reduced by the clamping process, especially in the middle of the slot 13 immediately below or above the fitting protrusion 9. The lateral extension or length 1 of the slot 13 transversely to the course of the roughly radially aligned fitting lugs 9 is greater than the width of the fitting lugs 9 on their base 9a in this part. in the direction shown in FIG. 3, FIG. 9 and FIG. 10. This creates a sufficiently long adaptation area 11 to be resiliently adaptable when clamping the entire clamping device by means of the fastening screw 2 as the slot width w is reduced.

In this case, the length 1 of the slot 13 or recess 13a transversely to the direction of the fitting lugs 9 may be about three to five times the width of the fitting lugs 9 on their base 9a in order to maintain sufficient spring action, flexibility or flexibility of the ductile region 11 with sufficient strength to maintain rectification; centering.

In FIG. 4 and FIG. 5 shows that recesses 13a can be provided instead of slots 13. However, it is also possible to provide a combination of recesses 13a and slots 13 on all adaptive areas 11.

The recesses 13a are in accordance with FIG. 5 on the upper side 18 facing away from the fitting protrusion 9 and the side edge walls 13b are arranged parallel to each other and at right angles with respect to the side faces 14 and the upper side 18. In the case of such recesses 13a below the fitting recesses 10 to the corresponding underside 17 of the first part 1

In addition, recesses 13a can be provided on opposite sides of each other and on each opposite opposite side. This is practically a special case of a slot in which the gap-shaped adaptation zone 11 is virtually omitted or eliminated. However, when the two parts 1 and 3 are fixed to one another, the elastic deformation of the adaptation zone 11 is substantially resilient to one another, as shown. FIG. 4. However, the second part 3 has a lower weight.

The fitting protrusions 9 have, according to FIG. 1 and FIG. 2 are longitudinally shaped and extend from the edge or the lateral side 14 of the second part 3 having them in the direction of its center and terminate in front of this center. The matching recesses 10 are shown in FIG. 6 are oriented in the same way and direction and are marginally open in the region of the lateral sides 15 of the first part 1. In this case, the fitting lugs 9 are prismatic centering bars or centering bar pieces, which according to FIG. 1 distributed uniformly over the circumference of the second part 3 and in the part having a circular cross section extending radially at right angles to the lateral sides 14 and corresponding edges, in the example embodiment it is in a quadrangular or square part.

At least two or two on each of the two opposite sides 15 which result in an alignment recess 10, which also fits together in the exemplary embodiment, which in no case may be absolutely necessary, could also be connected to each other by a through alignment recess 10 provided e.g. and the end regions then interact with the fitting protrusions 9 accordingly. This makes it possible to provide such mutually opposed fitting recesses 10 in a single working process.

In this case, the molded projections 9 are made in the form of strips, and accordingly the matching recesses 10 are arranged in lines that cross each other at right angles, so that the opposing thermal movement is not restricted even on the substrate at the edges of the open configuration of the matching recesses. 10. Such thermal movements may arise when the first part 1 is machined as a workpiece or is later mounted as an electrode-shaped tool. Thus, the alignment of the flat faces 4 and 5, as well as the alignment protrusions 9 and the alignment recesses 10, form a rectification in the X, Y and Z directions as well as in the direction of rotation about the central centerline of the arrangement, but do not restrict lateral thermal expansion and thermal movements.

The second part 3, which has slots 13 or recesses 13a for making the adaptation region 11, has a centrally arranged recess 16 into which openings 13 or recesses 13a openly open and the slots 13 or recesses 13a are also open in the direction of the lateral sides 14 so that they are arranged generally through, thereby allowing the conformability of the face region 11 shown in FIG. 4. In order to obtain as large a rectification and centering surface as possible, the fitting protrusions 9 extend through the entire width of the slot-provided area up to the recess 16. The fitting protrusions 9 thus have a length corresponding to the overall width of the slots 13 or recesses 13a. This also generates as uniform as possible deformation ratios when clamping the entire clamping device and pushing the fitting faces 4 and 5 together.

It should also be noted that the thickness of the material of the adaptive region 11 between the slots 13 or recesses 13a and between the alignment protrusion 9 or the alignment recess 10 is so large that deformation in the clamping direction requires a force of at least about 200 N for the alignment protrusion 9. This means that the fit in the region of the fit protrusions 9 is retained despite this mobility.

The fastening of the two parts 1 and 3, which is made on top of one another and is formed, for example, by a tool or a workpiece on a holder, presupposes that the two parts 1 and 3 fastened to each other have mating faces 4 and 5 lying there. by means of fastening means arranged transversely or at right angles to the contact plane of these fitting surfaces 4 and 5, for example by means of a single fastening screw 2. In this case, in addition to the opposite axial position, fitting surfaces 4 and 5 are provided the portions and fitting recesses 10 on the opposite portion that prevent the interconnected and clamped portions 1 and 3 from moving transversely to the fasteners within the contact plane of the fitting faces 4 and 5 and the fitting accurately center both portions 1 and 3 transversely with respect to this contact plane X and in the Y direction the levers 9 and / or the alignment recesses 10 provided for the resiliently displaceable or movable region 11 having part 1 or 3 and which is operable in the axial direction against the deformation force introduced by the fastening screw 2 so that the alignment projections 9 can engage the alignment recesses precisely 10 before the mating surfaces 4 and 5 fully touch each other. Due to a stronger tightening of the fastening means, the fitting surfaces 4 and 5 also come into contact with each other, so that there is no need for an additional part for rectification or centering in the X and Y directions.

Claims (15)

PATENT CLAIMS Workpiece clamping device with a holder and a carrier, both of these parts (1,3) intended to be fastened to each other, having mating surfaces (4, 5) abutting one another in the working position and clamped to each other by means of fastening means extending across or at right angles to the contact plane of these fitting surfaces (4, 5), wherein at the fastening point in addition to the fitting surfaces (4, 5) fixing the axial position, fitting protrusions (9) are provided which prevent mutual movement of the interconnected parts (1, 3) transversely to the fastening means, optionally within the contact plane of the mating surfaces (4, 5), and both parts (1,3) precisely center across this contact plane at least in the X and Y directions, characterized in that the mating protrusions (9) are arranged on one of the portions (3) between the mating surfaces (4, 5) and the other portion (1) to be connected thereto has a corresponding in their places, the matching recesses (10) which, when fastened to each other, fit precisely to each other in positive engagement, and that the matching projections (9) are provided in the axial direction against the deformation force of the resiliently deflecting or yielding region (11) of the part (3) ) that is equipped with it. Clamping device according to claim 1, characterized in that the fitting surfaces (4, 5) have a distance from one another which is equal to or less than the yieldability of the deflectable yield zone (10) when the fitting projections (9) engage the fitting recesses (10). 11). Clamping device according to claim 1 or 2, characterized in that the fitting projections (9) are wedge-shaped or arc-shaped or circular-shaped or have a trapezoidal or semicircular-shaped cross-section and fitting recesses (9). 10) have oppositely arranged opposing surfaces (12). Clamping device according to one of claims 1 to 3, characterized in that an adjacent recess (13a), a cavity and / or a slot (13) extending in particular parallel to the fitting surfaces (5) is provided in the clamping direction with the fitting projection (9). ) which separates the area (11) of the portions (3) containing the fitting protrusion (9) from the remaining area of these portions (3) and that the dimension of this cavity, recess (13a) or slot (13) running in the clamping direction is resiliently shrinkable process. Clamping device according to one of claims 1 to 4, characterized in that the recess (13a), the cavity or the slot (13) on the part (3) comprising the fitting lugs (9) is arranged downstream of the fitting lugs (9). ). Clamping device according to one of claims 1 to 5, characterized in that the fitting projections (9) have a longitudinal shape and extend from the edge of the part (3) containing them, in particular towards the center thereof and terminate in front of this center. and that the matching recesses (10) are oriented in the same way and open at the edge. Clamping device according to one of claims 1 to 6, characterized in that the fitting projections (9) are prismatic centering bars which are equally spaced around the periphery of the respective part (3), their longitudinal axes at the part (3) of the circular the cross-sections extend radially and extend perpendicularly to the flat lateral sides (14) of the rectangular cross section (3). Clamping device according to one of Claims 1 to 7, characterized in that the fitting projections (9) in the form of a bar and the fitting recesses (10) are arranged on mutually orthogonally intersecting lines on the fitting surfaces (4, 5) of both parts (4). 1, 3). Clamping device according to one of Claims 1 to 8, characterized in that the part (3) comprising recesses (13a) or slots (13) for forming the flexible region (11) has a substantially recess (16) in the middle, into which the recesses (13a) or slots (13) open openly, and that the slots (13) or recesses (13a) open openly in the direction of the lateral sides (14). Clamping device according to claim 4, characterized in that the fitting lugs (9) extend over the entire side of the area provided with the slot (13) from the outer side (14) to the recess (16). Clamping device according to one of Claims 1 to 10, characterized in that the lateral distribution or length (1) of the slot (13) or recess (13a) across the course of the fitting projections (9) is greater than the width of the fitting projections (9). in this direction. Clamping device according to one of Claims 1 to 11, characterized in that the material thickness 5 of the flexible region (11) located between the slot (13) or recess (13a) and the fitting projection (9) is so large that a force of at least about 200 N is required for each mating protrusion (9) to elastically deform the elastically yielding region (11) in the clamping direction. Clamping device according to one of Claims 1 to 12, characterized in that the length (1) of the slot (13) or recess (13a) transversely to extend the fitting projections (9) has a value of three times 10 to 5 times the width of the licensing projection (9) on its base (9a). Clamping device according to one of Claims 1 to 13, characterized in that the recesses (13a) are open at the top (18) or the bottom (17) facing away from the casting projection (9) or from the casting recess (10) and their side edge walls (13b) extend parallel to each other and / or perpendicular to their lateral sides (14, 15) or the upper side (18) or the lower side (17). Clamping device according to one of the preceding claims, characterized in that the at least two fitting recesses (10), which open on two opposite sides (15), are aligned with each other and / or are joined together in one fitting recess (10). ) passing through the center. 20 4 drawings