SAWING MACHINE AND GUIDING DEVICE FOR A SAW BAND OR SAW BLADE OF A SAWING MACHINE

Abstract

A guiding device for a saw band or a sawblade of a sawing machine is provided, which has at least one holder with at least one gliding part and/or at least one roll for an at least temporary gliding and/or rolling contact with the saw band or sawblade. The at least one gliding part and/or the at least one roll is provided on the holder in a movable fashion in reference to the holder, with the at least one gliding part and/or the at least one roll being movable in reference to the holder via at least one piezo-actuator, essentially perpendicular to the direction of movement of the saw band or sawblade. A sawing machine with such a guiding device is also provided.

Claims

1. A guiding device for a saw band or a sawblade of a sawing machine, comprising at least one holder (1) with at least one gliding part (5), at least one roll (9), or at least one gliding part (5) and at least one roll (9), for at least a temporary gliding, rolling, or gliding and rolling contact with a saw band (6) or a sawblade, at least one of the at least one gliding part (5) or the at least one roll (9) is fastened to the holder (1) in a manner movable in reference to the holder (1), with the at least one of the at least one gliding part (5) or the at least one roll (9) being movable via at least one piezo-actuator (3) in reference to the holder (1).

2. The guiding device according to claim 1, wherein the at least one piezo-actuator (3) is arranged directly or indirectly between at least one of the at least one gliding part (5) or the at least one roll (9) and the holder (1).

3. The guiding device according to claim 1, wherein the at least one piezo-actuator (3) acts via a lever arrangement (10) upon at least one of the at least one gliding part (5) or the at least one roll (9).

4. The guiding device according to claim 1, further comprising a pressure plate (4) provided in the holder (1) for at least one side of the saw band (6) or the sawblade, the pressure plate being movable relative to the holder (1), and the at least one gliding part (5) is fastened to the pressure plate for at least a temporary gliding contact with the saw band (6) or the sawblade, with the pressure plate (4) being fastened to the holder (1) via the at least one piezo-actuators (3).

5. The guiding device according to claim 1, wherein the guiding device is adapted for use with the saw band (6) and further comprises a fastener (1), which is provided with bearings (8) for the roll (9) for at least a temporary rolling contact with a back of the saw band, and the bearings (8) being movable in reference to the holder (1) directly or indirectly via the at least one piezo-actuator (3).

6. The guiding device according to claim 1, further comprising at least one sensor for detecting vibrating motions of the saw band (6) or the sawblade.

7. The guiding device according to claim 6, wherein the at least one piezo-actuator (3) or another piezo-actuator is embodied as the sensor for detecting vibrating motions of the saw band (6) or the sawblade.

8. The guiding device according to claim 6, wherein the at least one sensor provided to detect vibrating motions of the saw band (6) or the sawblade is embodied as at least one of a solid borne sound sensor and/or as an optic vibration sensor.

9. The guiding device according to claim 1, further comprising a control unit for at least one of controlling or regulating the motions of the at least one piezo-actuator (3).

10. The guiding device according to claim 9, wherein the control unit comprises a set of different control programs for controlling the at least one piezo-actuator (3), which can be selected by entering sawing parameters and by which a counter vibrating motion of the piezo-actuator (3) can be generated in order to counteract or damp any vibrating motions of the saw band (6) or sawblade developing during the sawing process.

11. The guiding device according to claim 9, wherein the control unit is embodied such that based on signals of at least one sensor, counter vibration movements of the at least one piezo-actuator (3) are generated in order to counteract or damp any vibrating motions of the saw band (6) or sawblade developing during the sawing process.

12. The guiding device according to claim 9, wherein several of the piezo-actuators (3) are provided and the control unit is embodied to control the piezo-actuators (3) differently.

13. The guiding device according to claim 9, wherein the control unit is configured with a self-learning algorithm, which uses signals obtained from at least one sensor as a control of successful operation.

14. The guiding device according to claim 1, further comprising a hydraulic movability being provided for at least one of the at least one gliding part (5) or the at least one roll (9).

15. The sawing machine for sawing at least one of metal or mineral workpieces, comprising a saw band (6) or sawblade, driven to circulate for a sawing process and movable in reference to a workpiece, and comprising the guiding device according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In the following, exemplary embodiments for the components essential for the invention of a guiding device embodied according to the invention are described in greater detail and explained based on the attached drawing. Shown are:

[0027] FIG. 1 a schematic exploded illustration of a lateral guidance of a saw band;

[0028] FIG. 2 a cross-section in a top view of a saw band with two lateral band guides according to FIG. 1, in the idle position;

[0029] FIG. 3 an illustration according to FIG. 2, however in an engaged position of the band guides;

[0030] FIG. 4 a schematic exploded illustration of a back guide for a saw band;

[0031] FIG. 5 a schematic cross-section of the back guidance of FIG. 4 in the idle position;

[0032] FIG. 6 an illustration similar to FIG. 5, however in the engaged position;

[0033] FIG. 7 a schematic perspective illustration of a guiding device for a saw band, comprising two lateral band guides and a back guide according to the previous figures;

[0034] FIG. 8 a cross-section in a top view of a saw band with two lateral band guides according to another exemplary embodiment in the idle position; and

[0035] FIG. 9 an illustration similar to FIG. 8, however in the engaged position of the band guides.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0036] In the schematic exploded illustration according to FIG. 1 the essential elements are shown of a first exemplary embodiment of a lateral band guide designed according to the invention for a saw band of a band saw machine. It comprises a holder 1, a counter pressure plate 2, four piezo-actuators 3, a pressure plate 4, and four glide parts 5.

[0037] The glide parts 5 are connected fixed to the pressure plate 4 and they at least temporarily come into a gliding contact with the saw band (not shown here). They are made from hard metal plates. The pressure plate 4, on which the gliding parts 5 rest, is movable in reference to the holder 1 in order to move the gliding part 5 into abutting contact with the saw band and to allow distancing it therefrom and/or to perform an active vibration damping.

[0038] On the one side, the piezo-actuators are mounted fixed at the pressure plate 4 and on the other side, they are connected fixed to the counter pressure plate 2. The counter pressure plate 2 rests here locally fixed in the holder 1, while the pressure plate 4 is not connected to the holder 1, so that the piezo-actuators alter the distance between the counter pressure plate 2 and the pressure plate 4 as a function of a voltage applied (FIGS. 2 and 3).

[0039] The piezo-actuators 3 can be encapsulated for example by a circumferential O-ring seal between the counter pressure plate 2 and the pressure plate 4 such that they are not compromised by the environment of the saw band and particularly any cooling-lubricating emulsion commonly used. The electric contacting can here occur through the counter-pressure plate 2. The pressure plate 4 simultaneously shields the piezo-actuators 3 mechanically from the saw band. The holder 1 shows the form of a housing, which is essentially closed by the pressure plate 4 serving as a lid, so that this way too a protective effect results for the piezo-actuators 3.

[0040] Due to the fact that the present exemplary embodiment shows four spatially distributed piezo-actuators 3, they may perhaps also be addressed differently in order to generate many various counter-oscillating motions of the counter pressure plate 2 and thus of the gliding parts 5. If the counter pressure plate 2 is fastened in the holder 1 in a detachable fashion the counter pressure plate 2, the pressure plate 4, the piezo-actuators 3, and the gliding parts 5 can be exchanged as a module.

[0041] FIGS. 2 and 3 show the functionality of the guide shown in FIG. 1, with respectively a saw band 6 being shown in a cross-section, with its two sides respectively being provided with a guide of FIG. 1.

[0042] In FIG. 2 a voltage is applied to the piezo-actuators 3, by which the distance between the counter pressure plate 2 and the pressure plate 4 is minimal so that the gliding parts 5 fastened on the pressure plate 4 are separated from the saw band 6, thus keep a certain distance therefrom. Here it is clearly discernible that the piezo-actuators 3 are shielded by the holder 1 and the pressure plate 4 from the saw band 6.

[0043] In FIG. 3 the voltage applied to the piezo-actuators 3 is altered such that it deforms and increases the distance between the counter pressure plate 2 and the pressure plate 4 (arrows). This leads to the gliding parts 5 coming into contact with the saw band 6 and guide it via a gliding contact. The piezo-actuators 3 can also be addressed to generate a counter oscillating motion in order to actively damp potential vibrations of the saw band 6.

[0044] FIG. 4 shows in turn a schematic exploded illustration, with the second exemplary embodiment disclosing a rear guide for a saw band (not shown here either). This back guide comprises in its essential parts a holder 1, in the present case embodied showing almost the form of a cube, which is open towards the bottom, two piezo-actuators 3, a bearing bridge 7 with the bearings 8, and a roll 9 in which the bearings 8 rest.

[0045] On the one side, the piezo-actuators 3 are connected fixed to the back of the bearing bridge 7 and on the other side fastened inside the holder 1 such that a piezo-electric alteration of the form of the piezo-actuators 3 leads to a relative motion of the bearing bridge 7 and thus also the roll 9 towards the holder 1.

[0046] This way the roll 9 can be made to contact the saw band 6 and be distanced therefrom, which is illustrated based on the cross-sections in FIGS. 5 and 6. In FIG. 5 in turn a voltage is applied to the piezo-actuators 3, which leads to a minimal distance between the bearing bridge 7 and the holder 1, while in FIG. 6 a voltage is applied to the piezo-actuators 3 which increases this distance and thus allows the roll 9 to contact the back of the saw band 6 such that the roll 9 is here in a rolling contact with the saw band 6.

[0047] FIGS. 5 and 6 illustrate that the piezo-actuators 3 are mechanically shielded from the saw band 6 on the one side by the bearing bridge 7 and on the other side by the holder 1 and can perhaps be encapsulated. By a rapid change of the voltage applied to the piezo-actuators 3 here counter vibrations of the bearing bridge 7 and thus the roll 9 can be generated in order to actively damp the vibrations of the saw band 6. Here, perhaps the two piezo-actuators 3 can be controlled differently.

[0048] FIG. 7 shows a perspective, schematic illustration of a saw band 6 of a sawing machine (not shown in greater detail), with the parts shown in the previous figures of a guiding device embodied according to the invention on the one side being used for a lateral guidance of the saw band 6 and on the other side for the rear guidance. From the lateral guides the holder 1, the pressure plate 4, and the gliding parts 5 are visible; the piezo-actuators 3 are encased by the holder 1 and the pressure plate 4. The piezo-actuators included in the rear guidance are not visible in this illustration but only the holder 1 and the roll 9, which rolls on the back of the saw band 6 and guides it.

[0049] FIGS. 8 and 9 show once more, similar to FIGS. 2 and 3, a top view of a saw band 6, with its two sides respectively being guided by a guide system embodied according to the invention. These guides differ from the ones shown in the previous figures and they embody a different exemplary embodiment of the present invention:

[0050] In this exemplary embodiment, shown in FIGS. 8 and 9, the gliding parts 5, 5′ of the two guides are again arranged on a pressure plate 4, 4′. However, the piezo-actuators 3, 3′ are fastened on the holder 1, 1′ spaced apart from the gliding parts 5, 5′ and the pressure plates 4, 4′ and act via a lever arrangement 10 upon the pressure plates 4, 4′ and the gliding parts 5, 5′. The lever arrangement 10 is fastened pivotally like a rocker via a rotational link 11 at the holder 1, with the lever arms on the one side being connected in an articulate fashion to the piezo-actuators 3 and on the other side to the pressure plate 4, also in an articulate fashion.

[0051] FIG. 8 shows the shut-off position and/or resting position of the guide system. Here a voltage is applied to the piezo-actuators 3 such that they have minimal thickness and thus cause via the lever arrangement 10 that the pressure plate 4 and thus the gliding parts 5 fastened thereon are lifted off the saw band 6.

[0052] In FIG. 9 the voltage applied to the piezo-actuators 3 is altered such that they have deformed. This way, the lever arrangement 10 was moved (arrows) and the pressure plate 4 and/or the gliding parts 5 fastened thereon are made to contact the saw band 6 in order to guide it in a gliding contact.

[0053] By the lever arrangement 10 the piezo-actuators 3 and thus also their electric contacting are spaced apart from the saw band 6 and the gliding parts 5 as well as the lubrication generally required by a cooling-lubricating emulsion. The piezo-actuators 3 are therefore advantageously not subjected to the rough environment of the saw band 6 and the gliding parts 5.