AT1961U1 - POSITIONING DEVICE FOR A MACHINING DEVICE - Google Patents

Abstract

The invention relates to a positioning device for a processing device (1) for plate-shaped workpieces (3), in particular for a milling and / or cutting device (2). This machining device (1) is provided with a machine frame (4) which forms a support surface (5) for the workpieces (3) and with a clamping surface (35) of a clamping device (15) which runs parallel to the support surface (5) to determine the distance between the support surface ( 5) and the clamping surface (35) of the workpiece (3) and provided with a processing unit (24) which can be adjusted at least perpendicularly to the supporting surface (5) or to the clamping surface (35). In the immediate processing area (37) between the contact surface (5) and the clamping surface (35), a pressing device (38) is arranged and an infeed direction - according to arrow (27) - of the processing unit (24) is equal to a pressing direction - according to arrow (59) -The pressing device (38).

Description

AT 001 961 Ul

The invention relates to a positioning device for a processing device, as described in the preamble of claim 1.

Positioning or clamping devices for the workpieces in processing machines known from the prior art are replaced by manually or pneumatically adjustable clamping beams, preferably when machining large workpieces, or by manually operated, so-called eccentric lever clamps, preferably in the case of selective machining of the workpiece, such as e.g. Drilling, formed. The disadvantage here is that with plate-shaped workpieces that have a certain thickness tolerance due to production or bulges due to storage or material or are thrown due to material-related tensions or due to the influence of moisture or have a warp, precise machining of the workpiece is not guaranteed.

The object of the invention is to provide a positioning device for a machining device which compensates for the tolerances of the workpiece in such a way that a machining accuracy for the workpiece can be achieved which is within the dimensional tolerance range of the unmachined workpiece.

This object of the invention is achieved by the features in the characterizing part of claim 1. It is advantageous here that the tolerances of the workpiece, in particular of plates, are concentrated on the machining side of the workpiece opposite the clamping surface of the clamping device and thus the reference dimension formed by the clamping surface for the machining paths of the machining unit is reliably maintained at least over the entire machining path. This advantageously allows workpieces to be machined whose dimensional tolerance is greater than the required machining accuracy.

An embodiment according to claim 2 is advantageous, since this enables comfortable handling of the workpieces and unimpeded feeding of the workpiece to the machining device.

A further advantageous embodiment is described in claim 3, since this can increase the contact pressure of the contact pressure device and thus also allow thickness tolerances of the workpiece that require a relatively high contact pressure to be compensated for. Furthermore, it is advantageous that the pressure surface of the pressure device is increased and thus pressure-sensitive surfaces of the workpiece can be taken into account if necessary.

An embodiment according to claim 4 is also advantageous, since at least all the dimensional tolerances of the workpiece present on the machining path are taken into account without causing pressure points at those points on the workpiece where there are no dimensional tolerances.

Due to the advantageous embodiment according to claim 5, an inexpensive and maintenance-free drive for the pressing device can be achieved depending on the area of application or depending on the pressure medium source already present.

But it is also an embodiment according to claim 6 advantageous, since the working stroke of the pressing device can be easily controlled and a further drive for resetting the pressing device is not required.

Another advantage is an embodiment according to claim 7, since the direction of the working stroke of the pressing device can be determined in a simple manner.

An embodiment according to claim 8 is also advantageous since the working stroke has a defined direction in a simple manner due to the change in cross-section of the hose of the pressing device.

According to an advantageous development according to claim 9, the machining side of the workpiece coincides with the clamping side of the workpiece, whereby the removal of the material of the workpiece, in particular gypsum dust or wood chips, can be easily removed or the material obtained does not impair the function of the machining unit in the long term. 3 AT 001 961 Ul

A design according to claim 10 is also advantageous, since this creates a flat support surface for the workpiece and thus enables unhindered feeding of workpieces.

According to an advantageous embodiment, as described in claim 11, the tolerances of the workpiece are reliably concentrated on the machining side of the workpiece and the reference dimension is thus reliably maintained over the entire machining path.

The advantageous embodiment according to claim 12 ensures that all tolerances of a plate, e.g. the workpiece thickness difference or the curvature of the workpiece is reliably and completely concentrated on one side of the workpiece.

However, an embodiment according to claim 13 is also advantageous, since the counter surface of the pressing device is thereby formed by the machine table or the necessary clamping device, which is required anyway, and thus a defined reference dimension for calculating the machining paths, in particular the infeed dimension, from a control device or also for the calculation of the delivery route in a manually performed delivery process.

Finally, an embodiment according to claim 14 is also advantageous because it can also be used to equip already existing processing devices with the pressing device and, furthermore, several pressing devices, for example modularly designed for different processing materials or processing paths, can be used interchangeably, thereby avoiding time-consuming readjustments.

The invention is explained in more detail below with reference to the exemplary embodiments shown in the drawings.

Show it:

Figure 1 is a processing device designed according to the invention, in side view and simplified, schematic representation.

Fig. 2 shows the processing device of FIG. 1 with the upper 4 AT 001 961 Ul removed

Protective covers, cut, according to lines II - Π in Fig. 1;

3 shows an enlarged section from the processing area of the processing device with the pressing device deactivated, according to the detailed lines in FIG. 1;

FIG. 4 shows a sectional view through the processing area of the processing device, according to lines IV-IV in FIG. 3;

5 shows an enlarged detail from the processing area of the processing device with the pressing device activated, according to the detailed lines in FIG. 1;

6 is a sectional view through the processing area in the operating state of the processing device, according to lines VI - VI in FIG. 5.

1 and 2 show a processing device 1, in particular a milling and / or cutting device 2, for preferably plate-shaped workpieces 3. A machine frame 4 forms a table-shaped support surface 5 for the workpieces 3 to be machined. On opposite end regions 6, 7 of the machine frame 4, pressure beam towers 8, 9, which extend in the vertical direction and project beyond the support surface 5 and are formed by profiles, are arranged. Guide arrangements 10, 11 of the pressure beam towers 8, 9 support a pressure beam 14 of a tensioning device 15 that is adjustable in the direction perpendicular to the support surface 5, in particular a pressure beam 14 that can be adjusted in the closing direction - according to arrow 12 - and in the opening direction - according to arrow 13 C-shaped and the pressure beam 14 forming the profile 17 faces the workpiece 3. Adjusting drives 18, e.g. Cylinders 19, 20 which can be pressurized are supported on the pressure beam towers 8, 9 and are connected in motion for the adjustment of the pressure beam 14 of the tensioning device 15 via piston rods 21, 22 of the cylinders 19, 20.

Of course, as an adjustment drive 18 for the pressure beam 14, electromotive spindle drives, linear motor drives, etc. can also be used, or the pressure beam towers 8, 9 themselves can be vertically adjusted with a pressure beam 14 connecting them to the machine frame 4 with respect to the contact surface 5 5 AT 001 961 Ul gert.

In the area between a contact surface 23 of the machining device 1 and the support surface 5 there is a machining unit 24 known from the prior art for the workpieces 3, such as e.g. a milling device, a circular saw, etc. arranged. A tool 25 of the machining unit 24 for machining the workpiece 3 is therefore, e.g. formed by a milling cutter 26 or a circular saw blade, a drill, etc.

The processing unit 24 with the tool 25 is adjustable for the processing of the workpiece 3 at least in one feed direction - according to an arrow 27 which runs perpendicular to the support surface 5. Furthermore, the processing unit 24 is adjustable in a return direction - according to an arrow 28 - with respect to the support surface 5 vertically moving away. The processing unit 24 is preferably adjustable for a processing operation in the direction of travel - according to a double arrow 29 - which corresponds to the longitudinal extent of the pressure beam 14, via a longitudinal guide 30. A slot-shaped recess 32 for the passage of the tool 25 is arranged in a machine table 31 forming the table-shaped support surface 5 in the direction of travel - according to double arrow 29 - or for all directions of movement to be carried out with a 3-coordinate travel path of the processing unit 24.

A workpiece 3 to be machined with the machining device 1, in particular a plate 33, rests with a machining side 34 on the support surface 5 of the machine table 31. A clamping surface 35 of the pressure beam 14 facing the plate 33 is in the activated state of the clamping device 15 on a side 36 opposite the machining side 34 of the plate 33, whereby the workpiece 3 or the plate 33 is fixed between the machine table 31 and the pressure beam 14. In a machining region 37 of the workpiece 3, which is formed by the immediate region in and around the recess 32 on the machining side 34 of the plate 33, there is one between the machining side 34 and the support surface 5 - as can best be seen in FIG. 2 Pressure device 38 arranged. This pressing device 38 is formed by a hose 39 which runs along a processing path of the tool 25 or in the longitudinal direction of the recess 32.

A control device 40 shown schematically in FIG. 1 controls the entire 6 AT 001 961 Ul

Sequence of processing device 1, in particular the sequence of movements of processing unit 24, tensioning device 15 and pressing device 38. To activate pressing device 38, hose 39 must be pressurized with a preferably gaseous pressure medium, in particular compressed air. Of course, it is also possible to introduce liquid pressure media into the hose 39 of the pressing device 38.

3 to 6 show a detail from the machining area 37 of the machining device 1, the same reference numerals being used for parts of the machining device 1 already described above. 3 and 4 show a section of the machining area 37 with the workpiece 3 clamped, that is to say with the clamping device 15 activated but with the pressing device 38 deactivated. In comparison, FIGS. 5 and 6 show a section from the machining area 37 with the clamping device 15 clamped workpiece 3 being machined with the pressing device 38 activated at the same time.

It can be seen here that the machine table 31 is provided with a table covering 41, preferably formed by plastic materials. In this table covering 41 there is arranged a groove 42 which faces the groove opening on the machining side 34 of the workpiece 3 and into which the hose 39 of the pressing device 38 is inserted. The support surface 5 for the workpiece 3 is therefore formed by a surface 43 of the table covering 41 facing the pressure bar 14.

A depth 44 from a groove base 45 of the groove 42 to the surface 43 is equal to or smaller than a height of the hose 39 measured adequately to the depth 44 when the pressing device 38 is deactivated or equal to or smaller than a diameter 46 of the hose 39 when the pressing device 38 is deactivated Fig. 4. At least a part of the surface of the hose 39 is on the groove sides walls 47, 48 and the groove bottom 45 of the groove 42. A surface area 49 of the hose 39 facing the workpiece 3 only touches or touches the contact surface 5 or the machining side 34 of the workpiece 3 in the deactivated state of the pressing device 38. It is also possible to pass the contact surface 5 in the manner of a passer-by to the surface area 49 of the hose 39 to run, ie that the surface area 49 and the support surface 5 or the machining side 34 of the workpiece 3 in the deactivated state of the pressing device 38 run at a distance from one another. 7 AT 001 961 Ul

The recess 32 of the machine table 31 is at least partially coincident with a recess 50 in the table covering 4L. The dimensions of the recess 50 are selected so that the tool 25 can pass through and, if necessary, the tool 25 can be adjusted along the machining path.

An axis of symmetry 51 preferably runs through the opening 16 of the pressure beam 14, through the recess 50 of the table covering 41 and through the recess 32 of the machine table 31. An axis of symmetry 52 of the tool 25 is preferably aligned with the axis of symmetry 51.

3 and 4, the clamping device 15 is activated, whereby the pressure beam 14 is moved in the closing direction - according to arrow 12 - and subsequently sits or rests with the clamping surface 35 on the side 36 of the plate 33 the plate 33 presses against the bearing surface 5.

Due to a difference in thickness 53 of the workpiece 3 or the plate 33, however, the clamping surface 35 of the pressure beam 14 is only in regions on the side 36 of the workpiece 3. In the exemplary embodiment shown, the difference in thickness 53 is given by a thicker or thicker plate 33 in contrast to the central region of the plate 33 at the edge regions, as a result of which the pressure beam 14 with the clamping surface 35 rests on these higher edge regions of the plate 33. Likewise, it would be possible for the plate 33 to be thicker in the central region than at the edge regions or for different thicknesses to be present within the plate 33 and as a result the clamping surface 35 of the pressure beam 14 to rest only in regions.

Likewise or at the same time, it is possible for the plate 33 to be machined to have a curvature 54, as a result of which the pressure beam 14 of the clamping device 15 with a relatively low shut-off clamping force - above all so as not to damage the surface of the plate 33 - not evenly on the side 36 the plate 33 comes to rest.

In all of the above cases, therefore, a workpiece thickness difference 55 remains between the clamping surface 35 of the pressure beam 14 and the side 36 of the workpiece 33 and / or also between the contact surface 5 and the machining side 34. 8 AT 001 961 Ul

The workpieces 3 of the processing device 1 are formed by plasterboard 56 in the example described. The gypsum core of the gypsum board 56 is provided in the usual way on the surface areas with a cardboard-like cover layer 57. It is also conceivable to process other coated panels 33, in particular veneered panels 33, with the processing device 1.

To form claddings with the coated panels 33 or with the plasterboard panels 56, it is necessary to incorporate one or more recesses 58 on the processing side 34 of the panel 33, the cover layer 57 on the side 36 of the panel 33 not being damaged, in order to obtain continuous and shapely or uniform edges of the cladding after folding the machined plate 33 into an L, U shape or other shapes or bodies. These recesses 58 have a V-shaped cross section in cross section, the flanks of the recess 58 forming an angle of 90 ° to one another to form a right-angled cladding element.

In the case of commercially available plasterboard 56, the cover layer 57 or the cardboard layer has a thickness of 0.3 mm to 0.5 mm. In order not to cut through the second cover layer 57 in the case of workpiece thickness differences 55 of up to 0.7 mm during the one-sided groove operation of the plate 33, the pressing device 38 is provided.

In order to ensure such precise machining with the aforementioned tolerances of the plate 33, it is necessary to concentrate the tolerances of the plate 33 on the machining side 34 opposite the side 36. That is, the curvature 54 or the difference in workpiece thickness 55 on the side 36 opposite the machining side 34 must be less than or equal to the thickness of the cover layer 57, or preferably the curvature 54 or the difference in workpiece thickness 55 on the side 36 runs towards zero or Assumes zero. This creates a flat base on the side 36 and the clamping surface 35 of the pressure beam 14 lies flat on the side 36.

This is achieved when the pressure device 38 is activated, that is, the hose 39 is acted upon by the pressure medium, in particular the compressed air. For this purpose, one end of the hose 39 must be closed in a gas-tight or liquid-tight manner, and at a further end of the hose 39 the control device 40, not shown in FIGS. 3 to 6, controls the pressure medium and introduces it into the hose 39. The stretchable 9 AT 001 961 Ul

The cross-section of the tube 39 changes, as a result of which the surface of the tube 39 is additionally supported on the groove side walls 47, 48 due to the expansion. With a corresponding pressure increase, the surface area 49 of the hose 39 is then pressed against the processing side 34 and, as the pressure in the hose 39 increases further, the plate 33 in the processing area 37 is raised, as can best be seen in FIG. 6, and the side 36 becomes flat the clamping surface 35 of the pressure beam 14 is pressed, that is to say that a reference dimension of the plate 33 defined by the clamping surface 35 is maintained as one of the calculation bases of the control device 40 over the entire machining area.

All curvatures 54 or differences in thickness 53 of the plate 33 have thus - as can be seen from FIG. 6 - been concentrated between the plate 33 and the support surface 5 or the surface 43. A correspondingly high pressure of the pressure medium thus compensates for all curvatures 54 or differences in thickness 53 present in the processing area 37, since the hose 39 can only rise over the bearing surface 5 where there is a curvature 54 or a difference in thickness 53 in the plate 33 and thus in comparison to a rigid pressing device 38, for example a dimensionally stable pressure element, no damage to the cover layer 57 can occur.

A protrusion 60 of the surface area 49 in the pressing direction - according to an arrow 59 - of the pressing device 38 perpendicular to the bearing surface 5 over the bearing surface 5 or over the surface 43 is at least the same size, preferably larger, than a workpiece thickness difference 55 or a curvature 54 Plate 33 or the workpiece 3 so that the side 36 can always be pressed flat against the clamping surface 35 of the pressure beam 14.

Instead of the cross-sectional shape of the hose 39 of the pressing device 38 shown in FIGS. 3 to 6, it is of course also possible to use hoses 39 with, for example, an elliptical cross section or a bellows-like pressing device 38 in the groove 43 instead of the hose 39, as a result of which, particularly in the case of a bellows-like pressing device 38 the contact pressure per unit area can be reduced to avoid pressure points and furthermore, particularly in the case of a bellows-type contact device 38, the plate material removed during processing, for example gypsum dust, cannot get into the groove 42. In a bellows-type pressure device 38, the pressure bellows is inserted into a groove 42 which is rectangular in cross section, the supporting surface of this pressure bellows resting on the groove 45 AT 001 961 Ul reason 45, the pressure surface of the pressure bellows running flat to the bearing surface 5, and the fold rows of the pressure bellows running along the groove side walls 47, 48 are assigned. For a machining operation, a plate 33 is to be fed to the machining device 1 and, for example, to be positioned on the machine table 31 via appropriate stops or feed devices. The tensioning device 15 is then activated, as a result of which the pressure bar 14 is moved in the closing direction — according to arrow 12. As soon as the pressure bar 14 comes into contact with the clamping surface 35 on the side 36 of the plate 33, which is recognized, for example, by a sudden increase in force or pressure on the adjustment drive 18, the adjustment of the pressure bar 14 in the closing direction - according to arrow 12 - is stopped and held immovably at the stop position at the same time. A measuring device coupled to the pressure bar 14 and connected to the control device 40 transfers the respective positions of the pressure bar 14 to the control device 40, that is to say also the stop position and thus the thickness of the plate 33. With the activation of the pressure device 38 by applying pressure to the hose 39 with the pressure medium the tolerances of the plate 33 described above are concentrated on the side of the plate 33 opposite the clamping surface 35. The side 36 of the plate 33 now lies over the entire surface on the clamping surface 35 and the stop position of the pressure bar 14 is used by the control device 40 as a reference dimension maintained over the entire machining area 37 for calculating the infeed dimensions for the tool 25.

The plate thickness minus the thickness of a cover layer 57 now determines the infeed dimension of the tool 25 in the infeed direction - according to arrow 27. Then the machining unit 24 is moved with the tool 25 along the machining path, for example in the direction of travel - according to double arrow 29 in FIG. 2 , without the cover layer 57 of the plate 33 opposite the processing side 34 being severed due to the activated pressing device 38, since the reference dimension is maintained over the entire length of the processing path by the pressing device 38. After the required recess 58 or the incision or the bore has been made in the plate 33, the processing unit 24 is moved with the tool 25 in the return direction - according to arrow 28 - away from the plate 33, the pressure bar 14 in the opening direction - according to arrow 13 - moved and the pressing device 38 deactivated, for example the hose 39 is vented. Then the plate 33 can be removed from the machining device 1 or another machining operation can be moved up for 11 AT 001 961 U1, since the machining unit 24 is already in the starting position for another machining operation.

Because of the measuring device coupled to the pressure bar 14 and the control device 40 connected to the line, it is thus possible to process plates 33 of different thicknesses in succession without conversion or adjustment work, since the control device 40 automatically generates or calculates tool and workpiece-dependent infeed dimensions for the processing unit 24

Of course, especially when processing only a certain thickness of plates 33, it is possible to arrange an immovable pressure beam 14 or a fixed clamping surface 35, the distance from the contact surface 5 to the clamping surface 35 having to correspond at least to the thickness of the plate 33. Furthermore, it is possible to adjust the clamping surface 35 manually. Of course, it is also possible not to let the pressing device 38 into its own table covering 41, but rather to provide corresponding grooves 42 for the hose 39 directly on the machine table 31. This is particularly the case when the machine table 31 is formed from cast iron, since the corresponding grooves 42 can be provided in a simple and inexpensive manner during manufacture.

In order to be able to increase the pressing force against the pressure bar 14 without leaving pressure points on the processing side 34 of the plate 33, it is possible, in deviation from the representations in FIGS. 3 to 6, on both sides of the tool 25 and along the processing path two pressing devices 38 to be arranged so as to be able to increase the pressing force of the pressing device 38, as a result of which the plate 33 lies flat against the clamping surface 35 over the entire machining region 37.

Furthermore, it is conceivable to arrange the pressure device 38 or the hose 39 on the pressure bar 14, whereby the pressure direction of the pressure device 38 is the same as the closing direction of the pressure bar 14, with the feed direction of the tool 25 simultaneously having to be the pressure direction of the pressure device 38.

Of course, it is also possible to always keep the pressure device 38 in the activated state, i.e. that the hose 39 always has a projection 60 over the 12 AT 001 961 Ul

Has support surface 5 or the surface 43 of the table covering 41 and the plates 33 are inserted into the processing device 1 with a correspondingly wide open pressure bar 14 and then the pressure bar 14 is closed, whereby in the same way a concentration of the tolerances of the plate 33 on that of the clamping surface 35th of the pressure bar 14 opposite processing side 34 of the plate 33 is reached.

Regardless of the embodiment shown in the drawings, the support surface 5 or the clamping surface 35 can also be aligned vertically or they can assume any positions that are favorable for processing.

Of course, it is possible within the scope of the invention to change the arrangement of the individual elements beyond the embodiment shown, or to combine them differently. Individual features from the exemplary embodiment shown can also form independent solutions according to the invention.

Finally, it should be noted that individual parts are disproportionately enlarged and shown schematically simplified in the drawings of the exemplary embodiment for a better understanding of the invention. 13

Claims (15)

AT 001 961 Ul claims 1. Positioning device for a processing device for plate-shaped workpieces, in particular milling and / or cutting device, with a machine frame forming a support surface for the workpieces and with a clamping surface of a clamping device running parallel to the support surface for fixing the between the support surface and the workpiece located on the clamping surface and with a processing unit that is adjustable at least perpendicular to the supporting surface or to the clamping surface, characterized in that a pressing device (38) is arranged in the immediate processing region (37) between the supporting surface (5) and the clamping surface (35) and an infeed direction - according to arrow (27) - the processing unit (24) is equal to a pressing direction - according to arrow (59) - the pressing device (38). 2. Positioning device according to claim 1, characterized in that the bearing surface (5) is formed by a machine table (31) and the pressing device (38) is embedded in this machine table (31). 3. Positioning device according to claim 1 or 2, characterized in that the pressing device (38) extends on both sides of the tool (25) of the processing unit (24) and along the processing path. 4. Positioning device according to one or more of the preceding claims, characterized in that the pressing device (38) is formed by a hose (39) which can be acted upon with a pressure medium and has a longitudinal extension parallel to the bearing surface (5) or clamping surface (35). 5. Positioning device according to one or more of the preceding claims, characterized in that the pressure medium for the pressing device (38) is gaseous or liquid. 6. Positioning device according to one or more of the preceding claims, characterized in that the cross section of the hose (39) of the pressing device (38) can be changed via the pressure medium. 14 AT 001 961 Ul 7. Positioning device according to one or more of the preceding claims, characterized in that only one of the clamping surface (35) facing surface area (49) of the hose (39) of the pressing device (38) is exposed. 8. Positioning device according to one or more of the preceding claims, characterized in that the hose (39) is arranged in a groove (42) of the machine table (31). 9. Positioning device according to one or more of the preceding claims, characterized in that the hose (39) is arranged on a pressure beam (14) of the tensioning device (15). 10. Positioning device according to one or more of the preceding claims, characterized in that a diameter (46) of the hose (39) in the deactivated state of the pressing device (38) is less than or at least equal to a depth (44) of the groove (42). 11. Positioning device according to one or more of the preceding claims, characterized in that the surface area (49) of the hose (39) facing the clamping surface (35) projects beyond the contact surface (5) or clamping surface (35) when the pressing device (38) is activated. 12. Positioning device according to one or more of the preceding claims, characterized in that an achievable projection (60) of the hose (39) over the support surface (5) or the clamping surface (35) with activated pressing device (38) at least the same size, preferably larger , is as a maximum workpiece thickness difference (55) or a height of a curvature (54) of a workpiece (3). 13. Positioning device according to one or more of the preceding claims, characterized in that when the pressing device (38) is activated, one side of the machining side (34) of the workpiece (37) is opposite (36) on one through the pressure bar (14) or through the machine table (31) formed reference surface lies flat. 14. Positioning device according to one or more of the preceding 15 AT 001 961 Ul claims, characterized in that the hose (39) of the pressing device (38) is embedded in a table covering (41) of the machine table (31). 16