METHOD FOR CONTROLLING A WALL SAW SYSTEM WHEN MAKING A CUT-OFF CUT

Description

Technisches Gebiet

[0001] The present invention relates to a method for controlling a wall sawing system when making a separating cut according to the preamble of claim 1. Stand der Technik

[0002] EP 1 693 173 B1 discloses a method for controlling a wall sawing system when making a separating cut in a workpiece between a first end point and a second end point. The wall sawing system comprises a guide rail and a wall saw with a saw head, a motorized feed unit that moves the saw head parallel to a feed direction along the guide rail, and at least one saw blade that is attached to a saw arm of the saw head and driven about a rotational axis by a drive motor. The saw arm is designed to be pivotable about a pivot axis by means of a pivot motor. By pivoting the saw arm about the pivot axis, the penetration depth of the saw blade into the workpiece is changed. The motorized feed unit comprises a guide carriage and a feed motor, wherein the saw head is mounted on the guide carriage and moved along the guide rail by the feed motor.A sensor system with a swivel angle sensor and a travel sensor is provided to monitor the wall saw system. The swivel angle sensor measures the current swivel angle of the saw arm, and the travel sensor measures the current position of the saw head on the guide rail. The measured values ​​for the current swivel angle of the saw arm and the current position of the saw head are regularly transmitted to a control unit on the wall saw.

[0003] The known method for controlling a wall sawing system is divided into a preparatory section and a processing of the separating cut controlled by the control unit. In the preparatory section, the operator specifies at least the saw blade diameter, the positions of the first and second end points in the feed direction, and the final depth of the separating cut; further parameters can be the material of the workpiece to be processed and the dimensions of embedded reinforcing bars. From the entered parameters, the control unit determines a suitable main cutting sequence of main cuts for the separating cut, wherein the main cutting sequence comprises at least a first main cut with a first main cutting angle of the saw arm and a first diameter of the saw blade used, as well as a subsequent second main cut with a second main cutting angle of the saw arm and a first diameter of the saw blade used.

[0004] After the controlled machining process has started, the saw head is positioned in a start position. In the start position, the saw arm is pivoted in a negative direction of rotation around the pivot axis and arranged at the negative first main cutting angle. The saw head is moved in a positive feed direction along the guide rail towards the second end point, with the saw arm in a pulling arrangement during machining. Before reaching the second end point, the saw head is stopped and moved back sufficiently far in a negative feed direction opposite to the positive feed direction. The saw arm is pivoted in a positive direction of rotation opposite to the negative direction of rotation from the negative first main cutting angle to a positive main cutting angle of the saw arm.

[0005] In a first variant, the saw arm is pivoted from the negative first main cutting angle to the positive first main cutting angle and the saw head is moved in the positive feed direction towards the second end point, with the saw arm in a pushing arrangement. When the second end point is reached, the feed direction is reversed and the saw head is moved in the negative feed direction towards the first end point, with the saw arm in a pulling arrangement. Before the first end point, the saw head is stopped and moved back sufficiently far in the positive feed direction. The saw arm is pivoted from the positive first main cutting angle to the negative first main cutting angle and the saw head is moved in the negative feed direction towards the first end point, with the saw arm in a pushing arrangement.

[0006] In a second variant, the saw arm is pivoted from the negative first main cutting angle to the positive second main cutting angle and the saw head is moved in the positive feed direction towards the second end point, with the saw arm in a pushing arrangement. When the second end point is reached, the feed direction is reversed and the saw head is moved in the negative feed direction towards the first end point, with the saw arm in a pulling arrangement. Before the first end point, the saw head is stopped and moved back sufficiently far in the positive feed direction. The saw arm is pivoted from the negative second main cutting angle to a positive main cutting angle and the saw head is moved in the negative feed direction towards the first end point, with the saw arm in a pushing arrangement.When the second main cut represents the final main cut, the saw arm is pivoted to the positive second main cut angle. When a third main cut is performed with a third main cut angle, the saw arm is pivoted from the negative second main cut angle to the positive third main cut angle of the third main cut. The process steps are repeated until the final depth of the cut is reached.

[0007] The known method for controlling a wall sawing system has the disadvantage that the saw head is reset before processing, in a pushing position with the saw arm. Resetting only positions the saw head and does not process the workpiece. The time required for positioning increases non-productive times, especially for short cuts. Darstellung der Erfindung

[0008] The object of the present invention is to develop a method for controlling a wall sawing system with high processing quality, in which the downtime for positioning the saw head and saw arm is reduced. High processing quality means, among other things, producing a separating cut with a narrow cutting gap.

[0009] This object is achieved according to the invention in the method for controlling a wall sawing system mentioned above by the features of the independent claim. Advantageous further developments are specified in the dependent claims.

[0010] According to the invention, it is provided that, before the start of the processing controlled by the control unit, a saw arm length of the saw arm, which is defined as the distance between the pivot axis of the saw arm and the rotational axis of the saw blade, a distance between the pivot axis and the top side of the workpiece, a first width for a blade guard used in the first main cut and a second width for a blade guard used in the second main cut are additionally determined, wherein the first and second widths are each composed of a first distance of the rotational axis to the first blade guard edge and a second distance of the rotational axis to the second blade guard edge, and the saw head is stopped during the controlled processing in a position in which a pivoting movement of the saw arm into a new pivot angle takes place, wherein after the pivoting movement of the saw arm into the new pivot angle,the second boundary of the wall saw facing the second end point coincides with the second end point, wherein the second boundary of the wall saw is formed by a second upper exit point of the saw blade used facing the second end point on an upper side of the workpiece if the second end point represents a free end point without an obstacle, by a second saw blade edge of the saw blade used facing the second end point if the second end point represents an obstacle and processing is carried out without a blade guard, and by a second blade guard edge of the blade guard used facing the second end point if the second end point represents an obstacle and processing is carried out with a blade guard.

[0011] The inventive method for controlling a wall sawing system has the advantage that machining is possible with a saw arm arranged exclusively in a pulling motion, and idle times for positioning the saw head are reduced by appropriate position control of the saw head. The second limit of the wall saw is used to control the process during the transition from the first main cut to the second main cut. The second limit is formed by the second upper exit point of the saw blade used in the case of a free end point without obstacles, and by the second saw blade edge (without blade guard) and the second blade guard edge (with blade guard) in the case of an obstacle.

[0012] For controlled processing of a separating cut, the control unit must know various parameters. These include the saw arm length, which is a fixed, machine-specific dimension of the wall saw, and the vertical distance between the pivot axis and the surface of the workpiece, which depends not only on the geometry of the wall saw but also on the geometry of the guide rail used.

[0013] If an endpoint represents an obstacle, the saw head's position is controlled via the blade guard edge facing the obstacle. With an asymmetrical blade guard, the first and second distances between the rotation axis and the blade guard edges are different, whereas with a symmetrical blade guard, the first and second distances between the blade guard edges are equal to half the width of the blade guard.

[0014] The control method according to the invention is characterized in that the second limit of the wall saw coincides with the second end point after the saw arm has pivoted into the new pivot angle. In a first refinement, the new pivot angle corresponds to the first main cutting angle of the first main cut, and in a second refinement, the second main cutting angle of the second main cut.

[0015] In the first further development, the saw arm is pivoted in the positive direction of rotation from the negative first main cutting angle into the positive first main cutting angle and after the pivoting movement into the positive first main cutting angle, the second upper exit point of the saw blade used coincides with the second end point when the pivot axis has a distance from the second end point of √[h 1 · (D 1 - h 1 )] + δ · sin(+α 1 ), where h 1 = h(+α 1 , D 1 ) = D 1 / 2 - Δ - δ · cos(+α 1 ) denotes the penetration depth of the saw blade used into the workpiece at the positive first main cutting angle with the first diameter, the second saw blade edge of the saw blade used coincides with the second end point when the pivot axis has a distance from the second end point of D 1 / 2 + δ · sin(+α 1 ), and the second blade protection edge of the blade protection used coincides with the second endpoint,if the pivot axis is at a distance from the second end point of B 1b + δ · sin(+α 1 ).,

[0016] In the method according to the invention, the saw arm is arranged exclusively in a pulling position and pivoted into a position such that, after pivoting, the second limit of the wall saw coincides with the second end point. As a result of the pivoting, residual material remains in the area of ​​the pivot axis. In a first variant, the residual material from the first main cut is completely removed in the first main cut, and in a second variant, it is partially removed in the first main cut.

[0017] In the first variant, the saw head is moved in a negative feed direction opposite to the positive feed direction by a path length of at least 2δ · |sin(+α 1 )| and the saw head is then positioned so that the second boundary of the wall saw coincides with the second end point after the pivoting movement of the saw arm into the positive second main cutting angle, wherein the second upper exit point coincides with the second end point when the pivot axis has a distance from the second end point of √[h 2 · (D 2 - h 2 )] + δ · sin(+α 2 ), where h 2 = h(+α 2 , D 2 ) = D 2 / 2 - Δ - δ · cos(+α 2 ) denotes the penetration depth of the saw blade used into the workpiece at the positive second main cutting angle with the second diameter, the second saw blade edge of the saw blade used coincides with the second end point when the pivot axis has a distance from the second end point of D 2 / 2 + δ · sin(+α 2 ),and the second blade guard edge of the blade guard used coincides with the second end point when the pivot axis is at a distance from the second end point of B 2b + δ · sin(+α 2 ).,

[0018] The first variant is referred to as complete removal of the residual material. The path length is set so that all of the residual material not removed by pivoting the saw arm is captured. After the residual material has been removed, the saw head is positioned for the second main cut. If the end point is free and unobstructed, the second upper exit point is used. If there is an obstacle, the second saw blade edge or the second blade guard edge is used, depending on whether machining is carried out with or without a blade guard. The first variant has the advantage that the residual material is completely removed in the first main cut, and in the second main cut only the cutting depth of the second main cut needs to be removed. The first variant is therefore suitable for lower-performance drive motors.

[0019] In the second variant, the saw head is moved in the negative feed direction in such a way that the second limitation of the wall saw coincides with the second end point after the pivoting movement of the saw arm into the positive second main cutting angle, wherein the second upper exit point of the saw blade used coincides with the second end point when the pivot axis has a distance from the second end point of √[h 2 · (D 2 - h 2 )] + δ · sin(+α 2 ), where h 2 = h(+α 2 , D 2 ) = D 2 / 2 - Δ - δ · cos(+α 2 ) denotes the penetration depth of the saw blade used into the workpiece at the positive second main cutting angle with the second diameter, the second saw blade edge of the saw blade used coincides with the second end point when the pivot axis has a distance from the second end point of D 2 / 2 + δ · sin(+α 2 ), and the second blade protection edge of the saw blade used sheet protection coincides with the second endpoint,if the pivot axis is at a distance from the second end point of B 2b + δ · sin(+α 2 ).,

[0020] The second variant is referred to as partial removal of the residual material. This combines the removal of the residual material and the positioning of the saw head for the second main cut. After pivoting the saw arm to the positive first main cutting angle, the saw head is moved until the pivot axis is at a defined distance from the second end point E 2. The distance depends on whether the end point is a free end point with no obstacles or, if the end point is an obstacle, whether processing is carried out with or without a blade guard. The distance is set so that the second limit of the wall saw coincides with the second end point E 2 after the pivoting movement to the positive second main cutting angle.The second variant has the advantage that the removal of the remaining material and positioning for the second main cut are combined, eliminating the additional positioning step. On the other hand, a greater cutting depth must be removed in the second main cut. Therefore, the second variant is suitable for high-performance wall saws.

[0021] In the second further development, the saw arm is pivoted in the positive direction of rotation from the negative first main cutting angle into the positive second main cutting angle and after the pivoting movement into the positive second main cutting angle, the second upper exit point of the saw blade used coincides with the second end point when the pivot axis has a distance to the second end point of √[h 2 · (D 2 - h 2 )] + δ · sin(+α 2 ), where h 2 = h(+α 2 , D 2 ) = D 2 / 2 - Δ - δ · cos(+α 2 ) is the penetration depth of the saw blade used into the workpiece at the positive second main cutting angle with the zweiten Diameter, the second saw blade edge of the saw blade used coincides with the second end point when the pivot axis has a distance from the second end point of D 2 / 2 + δ · sin(+α 2 ), and the second blade guard edge of the blade guard used coincides with the second end point when the pivot axis has a distance from the second end point of B 2b + δ · sin(+α 2 ).

[0022] The second refinement of the control method completely eliminates the need to remove the residual material during the first main cut. The distance is set so that the second limit of the wall saw coincides with the second end point after the saw arm pivots into the positive second main cutting angle. This variant, without removing the residual material, has the lowest downtime; however, a powerful drive motor for the saw blade is required, capable of handling the greater cutting depth at the end point.

[0023] Particularly preferably, the saw head is moved in the negative feed direction with the saw arm inclined at the positive second main cutting angle.Subsequently, during machining controlled by the control unit, the saw head is moved in such a way that a first limit of the wall saw facing the first end point coincides with the first end point after the pivoting movement of the saw arm from the positive second main cutting angle into a new pivoting angle, wherein the first limit of the wall saw is formed by a first upper exit point of the saw blade used on the upper side of the workpiece facing the first end point if the first end point represents a free end point without an obstacle, by a first saw blade edge of the saw blade used facing the first end point if the first end point represents an obstacle and machining is carried out without a blade guard, and by a first blade guard edge of the blade guard used facing the first end point if the first end point represents an obstacle and machining is carried out with a blade guard.

[0024] The method according to the invention is characterized in that the first limit of the wall saw, facing the first end point, is also used for control. After the saw arm pivots to the new pivot angle, the first limit of the wall saw coincides with the first end point. In a first refinement, the new pivot angle corresponds to the negative second main cutting angle of the second main cut, and in a second refinement, the negative third main cutting angle of a subsequent third main cut.

[0025] In the first further development, the saw arm is pivoted in the negative direction of rotation from the positive second main cutting angle into the negative second main cutting angle and after the pivoting movement into the negative second main cutting angle, the first upper exit point of the saw blade used coincides with the first end point when the pivot axis has a distance from the first end point of √[h 2 · (D 2 - h 2 )] - δ · sin(-α 2 ), where h 2 = h(-α 2 , D 2 ) = D 2 / 2 - Δ - δ · cos(-α 2 ) denotes the penetration depth of the saw blade used into the workpiece at the negative second main cutting angle with the second diameter, the first saw blade edge of the saw blade used coincides with the first end point when the pivot axis has a distance from the first end point of D 2 / 2 - δ · sin(-α 2 ), and the first blade guard edge of the blade guard used coincides with the first endpoint,if the pivot axis is at a distance from the first end point of B 2a - δ · sin(-α 2 ).,

[0026] In a first embodiment, the second main cut represents the last main cut of the main cutting sequence. The saw arm is pivoted in the negative direction of rotation from the positive second main cutting angle to the negative second main cutting angle, and after the pivoting movement to the negative second main cutting angle, the first upper exit point of the saw blade used coincides with the first end point when the pivot axis is at a distance from the first end point of √[h 2 · (D 2 - h 2 )] - δ · sin(-α 2 ), where h 2 = h(-α 2 , D 2 ) = D 2 / 2 - Δ - δ · cos(-α 2 ) denotes the penetration depth of the saw blade used into the workpiece at the negative second main cutting angle with the second diameter, the first saw blade edge of the saw blade used coincides with the first end point when the pivot axis is at a distance from the first end point of D 2 / 2 - δ · sin(-α 2 ),and the first blade guard edge of the blade guard used coincides with the first end point if the pivot axis has a distance from the first end point of B 2a - δ · sin(-α 2 ).,

[0027] Preferably, the saw head is moved in the positive feed direction with the saw arm inclined at the negative second main cutting angle by a distance of at least 2δ · |sin(-α 2 )|. This distance ensures that the residual material of the second main cut has been completely removed.

[0028] Alternatively, the main cutting sequence comprises a third main cut to be carried out after the second main cut with a third main cutting angle of the saw arm, a third diameter of the saw blade used and a third width of the blade guard used with a first and second distance to the blade guard edges, wherein the saw arm is arranged in a pulling arrangement during the third main cut and the saw head is moved in the positive feed direction.

[0029] In a first variant, the saw head is moved in the negative feed direction in such a way that the first limit of the wall saw coincides with the first end point after the pivoting movement of the saw arm into the negative second main cutting angle, wherein the first limit is formed by a first upper exit point of the saw blade used on the upper side of the workpiece, facing the first end point, if the first end point represents a free end point without an obstacle, by a first saw blade edge of the saw blade used, facing the first end point, if the first end point represents an obstacle and processing is carried out without a blade guard, and by a first blade guard edge of the blade guard used, facing the first end point, if the first end point represents an obstacle and processing is carried out with a blade guard.

[0030] To remove the remaining material, the saw head is moved in the positive feed direction with the saw arm inclined at the negative second main cutting angle by a path length of at least 2δ · |sin(-α 2 )| and the saw head is then positioned so that the first limit of the wall saw coincides with the first end point after the pivoting movement of the saw arm into the negative third main cutting angle, wherein the first upper exit point of the saw blade used coincides with the first end point when the pivot axis has a distance from the first end point (E 1 ) of √[h 3 · (D 3 - h 3 )] - δ · sin(-α 3 ), where h 3 = h(-α 3 , D 3 ) = D 3 / 2 - Δ - δ · cos(-α 3 ) denotes the penetration depth of the saw blade used into the workpiece at the negative third main cutting angle with the third diameter, the first saw blade edge of the saw blade used coincides with the first end point (E 1 ),if the pivot axis is at a distance from the first end point of D 3 / 2 - δ · sin(-α 3 ), and the first blade guard edge of the blade guard used coincides with the first end point, if the pivot axis is at a distance from the first end point of B 3a - δ · sin(-α 3 ).

[0031] In a second variant, the saw head is moved in the positive feed direction in such a way that the first limit of the wall saw coincides with the first end point after the pivoting movement of the saw arm into the negative third main cutting angle, wherein the first upper exit point of the saw blade used coincides with the first end point when the pivot axis has a distance from the first end point of √[h 3 · (D 3 - h 3 )] - δ · sin(-α 3 ), where h 3 = h(-α 3 , D 3 ) = D 3 / 2 - Δ - δ · cos(-α 3 ) denotes the penetration depth of the saw blade used into the workpiece at the negative third main cutting angle with the third diameter, the first saw blade edge of the saw blade used coincides with the first end point when the pivot axis has a distance from the first end point of D 3 / 2 - δ · sin(-α 3 ), and the first blade protection edge of the saw blade used sheet protection coincides with the first endpoint,if the pivot axis is at a distance from the first end point of B 3a - δ · sin(-α 3 ).,

[0032] In a third variant, the saw arm is pivoted in the negative direction of rotation from the positive second main cutting angle into the negative third main cutting angle and after the pivoting movement into the negative third main cutting angle, the first upper exit point of the saw blade used coincides with the first end point when the pivot axis has a distance from the first end point of √[h 3 · (D 3 - h 3 )] - δ · sin(-α 3 ), where h 3 = h(-α 3 , D 3 ) = D 3 / 2 - Δ - δ · cos(-α 3 ) denotes the penetration depth of the saw blade used into the workpiece at the negative third main cutting angle (-α 3 ) with the third diameter, the first saw blade edge of the saw blade used coincides with the first end point when the pivot axis has a distance from the first end point (E 1 ) of D 3 / 2 - δ · sin(-α 3 ), and the first blade protection edge of the blade protection used coincides with the first end point,if the pivot axis is at a distance from the first end point of B 3a - δ · sin(-α 3 ).,

[0033] The third variant completely dispenses with the removal of residual material during the second main cut. The distance is set so that the first limit of the wall saw, after the saw arm has pivoted, coincides with the first end point. The variant without removing residual material has the lowest downtime; however, a powerful drive motor capable of handling the greater cutting depth at the end point is required.

[0034] The first and second main cuts are performed with one saw blade and one blade guard, or alternatively, the first main cut is performed with one first saw blade and one first blade guard, the first saw blade having a first saw blade diameter and the first blade guard having a first blade guard width, and the second main cut is performed with one second saw blade and one second blade guard, the second saw blade having a second saw blade diameter and the second blade guard having a second blade guard width.

[0035] In a preferred variant, the first main cut of the main cutting sequence represents a pre-cut and the saw head is positioned in a start position after the start of the processing controlled by the control unit, wherein in the start position the first limit of the wall saw facing the first end point coincides with the first end point after the pivoting movement into the negative first main cutting angle.

[0036] The first upper exit point of the saw blade used coincides with the first end point when the pivot axis is at a distance from the first end point of √[h 1 · (D 1 - h 1 )] - δ · sin(-α 1 ), where h 1 = h(α 1 , D 1 ) = D 1 / 2 - Δ - δ · cos(-α 1 ) denotes the penetration depth of the saw blade used into the workpiece at the negative first main cutting angle with the first diameter, the first saw blade edge of the saw blade used coincides with the first end point when the pivot axis is at a distance from the first end point of D 1 / 2 - δ · sin(-α 1 ), and the first blade guard edge of the blade guard used coincides with the first end point when the pivot axis is at a distance from the first end point of B 1a - δ · sin(-α 1 ).

[0037] The method according to the invention applies to all main sections where the main cutting angle is less than or equal to a critical pivot angle. The critical pivot angle corresponds to ±90° if the end point represents an obstacle, and the critical pivot angle corresponds to 180° - arccos[Δ / (δ + D / 2)] if the end point represents a free end point without an obstacle. Ausführungsbeispiele

[0038] Embodiments of the invention are described below with reference to the drawings. These are not necessarily intended to represent the embodiments to scale; rather, where useful for explanation, the drawings are schematic and / or slightly distorted. With regard to additions to the teachings immediately apparent from the drawings, reference is made to the relevant prior art. It should be noted that numerous modifications and changes to the form and detail of an embodiment can be made without deviating from the general idea of ​​the invention. The features of the invention disclosed in the description, the drawings and the claims can be essential for the further development of the invention, both individually and in any combination.Furthermore, all combinations of at least two of the features disclosed in the description, the drawings and / or the claims fall within the scope of the invention. The general idea of ​​the invention is not limited to the exact form or detail of the preferred embodiment shown and described below, or limited to an object that would be more limited than the object claimed in the claims. For given dimensioning ranges, values ​​within the stated limits are also intended to be disclosed as limit values ​​and to be used and claimed as desired. For the sake of simplicity, the same reference numerals are used below for identical or similar parts or parts with identical or similar functions.

[0039] They show: FIG. 1 shows a wall sawing system with a guide rail and a wall saw; FIGS. 2A, B show the processing of a separating cut between a first and second free end point without an obstacle; FIGS. 3A, B show the processing of a separating cut between a first and second obstacle with a saw blade that is not surrounded by a blade guard; FIGS. 4A, B show the processing of a separating cut between a first and second obstacle with a saw blade that is surrounded by a blade guard; FIGS. 5A-N show the wall sawing system of the FIG. 1 when creating a separating cut between a first free end point without obstacle and a second free end point without obstacle using the method according to the invention; and FIGS. 6A-H the wall sawing system of FIG. 1 when creating a further separating cut between an obstacle and a free end point without an obstacle using the method according to the invention.

[0040] FIG. 1 shows a wall sawing system10 with a guide rail 11, a tool device arranged displaceably on the guide rail 11 12 and a remote control 13. The tool device is designed as a wall saw 12 and comprises a processing unit 14 and a motorized feed unit 15. The processing unit is designed as a saw head 14 and comprises a processing tool designed as a saw blade 16, that on a saw arm 17 and is driven by a drive motor 18 around an axis of rotation 19 is powered.

[0041] To protect the operator, the saw blade 16 is protected by a blade guard 21 which is attached to the saw arm 17 by means of a blade guard holder. The saw arm 17 is driven by a swivel motor 22 around a swivel axis 23 designed to be pivotable. The pivot angle α.of the saw arm 17 determines with a saw blade diameter D of the saw blade 16 how deep the saw blade 16 penetrates into a workpiece to be machined 24 The drive motor 18 and the swivel motor 22 are housed in a device housing 25 The motorized feed unit 15 comprises a guide carriage 26 and a feed motor 27, which in the embodiment is also arranged in the device housing 25. The saw head 14 is mounted on the guide carriage 26 and is moved along the guide rail 11 in a feed direction by the feed motor 27. 28 In the device housing 25, in addition to the motors 19, 22, 27, a control unit 29 to control the saw head 14 and the motorized feed unit 15.

[0042] A sensor device with several sensor elements is provided to monitor the wall sawing system 10 and the machining process. A first sensor element32 is a swivel angle sensor and a second sensor element 33 designed as a displacement sensor. The pivot angle sensor 32 measures the current pivot angle of the saw arm 17, and the displacement sensor 33 measures the current position of the saw head 14 on the guide rail 11.

[0043] The measured variables are transmitted from the swivel angle sensor 32 and the travel sensor 33 to the control unit 29 and used to control the wall saw 12.

[0044] The remote control 13 comprises a device housing 35, an input device 36, a display device 37 and a control unit 38, which is arranged inside the device housing 35. The control unit 38 converts the inputs of the input device 36 into control commands and data, which are transmitted to the wall saw 12 via a first communication connection. The first communication connection is designed as a wireless communication connection. 41or as a communication cable 42 The wireless communication connection is designed in the exemplary embodiment as a radio connection 41, which is located between a first radio unit 43 on the remote control 13 and a second radio unit 44 on the tool device 12. Alternatively, the wireless communication connection 41 can be in the form of an infrared, Bluetooth, WLAN, or Wi-Fi connection.

[0045] FIGN. 2A , B show the guide rail 11 and the wall saw 12 of the wall saw system 10 of the FIG. 1 when creating a separating cut 51 in the workpiece 24 of the workpiece thickness d.The separating cut 51 has a final depth T and extends in the feed direction 28 between a first end point E 1 and a second end point E 2 . The X direction is defined as a direction parallel to the feed direction 28, with the positive X direction being directed from the first end point E 1 to the second end point E 2 , and the Y direction is defined as a direction perpendicular to the X direction into the depth of the workpiece 24.

[0046] The end point of a severance cut can be defined as a free end point without obstacles or as an obstacle. Both end points can be defined as free end points without obstacles, both end points as obstacles, or one end point as a free end point and the other end point as an obstacle. Overlapping may be permitted at a free end point without obstacles. Due to the overlapping, the cutting depth at the end point reaches the final depth T of the severance cut. In the example of the FIGN. 2A , B the endpoints E 1 , E 2 form free endpoints without obstacle, whereby an intersection is not permitted at the free first endpoint E 1 and an intersection has occurred at the second endpoint E 2 .

[0047] FIG. 2A shows the saw head 14 in an assembly position X 0 and the saw arm 17 in a home position of 0°. The saw head 14 is positioned by the operator using the guide carriage 26 in the assembly position X 0 on the guide rail 11. The assembly position X 0 of the saw head 14 lies between the first and second end points E 1 , E 2 and is determined by the position of the pivot axis 23 in the feed direction 28. The position of the pivot axis 23 is particularly suitable as a reference position X Ref for monitoring the position of the saw head 14 and controlling the wall saw 12, since the X-position of the pivot axis 23 remains unchanged even during the pivoting movement of the saw arm 17. Alternatively, a different X-position on the saw head 14 can be defined as the reference position; in this case, the distance in the X-direction to the pivot axis 23 must also be known.

[0048] In the exemplary embodiment, the X-positions of the first and second end points E 1 , E 2 are defined by entering partial lengths. The distance between the mounting position X 0 and the first end point E 1 determines a first partial length L 1 , and the distance between the mounting position X 0 and the second end point E 2 determines a second partial length L 2 . Alternatively, the X-positions of the end points E 1 , E 2 can be defined by entering a partial length (L 1 or L 2 ) and a total length L as the distance between the end points E 1 , E 2 .

[0049] The separating cut 51 is created in several partial cuts until the desired final depth T is reached. The partial cuts between the first and second end points E 1 , E 2 are defined as main cuts, and the cutting sequence of the main cuts is defined as the main cutting sequence. At the end points of the separating cut, additional corner processing can be performed, which is referred to as obstacle processing in the case of an obstacle and as overcut processing in the case of a free end point with an overlap.

[0050] The main cutting sequence can be set by the operator, or the control unit of the wall sawing system can determine the main cutting sequence based on several constraints. Typically, the first main cut, also known as the pre-cut, is performed at a reduced cutting depth and reduced drive motor power to prevent polishing of the saw blade. The subsequent main cuts are generally performed at the same cutting depth, but can also have different cutting depths. The constraints typically set by an operator include the cutting depth of the pre-cut, the pre-cut power, and the maximum cutting depth of the subsequent main cuts. The control unit can determine the main cutting sequence based on these constraints.

[0051] The main cuts of a separating cut are performed with one saw blade diameter or with two or more saw blade diameters. If multiple saw blades are used, processing generally begins with the smallest saw blade diameter. In order to mount the saw blade 16 on the saw arm 17, the saw blade 16 must be arranged in the basic position of the saw arm 17 above the workpiece 24. Whether this boundary condition is met depends on two device-specific variables of the wall sawing system 10, firstly, a vertical distance Δ between the pivot axis 23 of the saw arm 17 and a top side 53 of the workpiece 24 and on the other hand from a saw arm length δ of the saw arm 17, which is defined as the distance between the rotation axis 19 of the saw blade 16 and the pivot axis 23 of the saw arm 17. If the sum of these two device-specific variables is greater than half the saw blade diameter D / 2, the saw blade 16 is arranged in the home position above the workpiece 24. The saw arm length δ is a fixed device-specific variable of the wall saw 12, whereas the vertical distance Δ between the pivot axis 23 and the surface 53 depends not only on the geometry of the wall saw 12 but also on the geometry of the guide rail 11 used.

[0052] The saw blade 16 is mounted on a flange on the saw arm 17 and is driven by the drive motor 18 around the rotation axis 19 during sawing operation. In the basic position of the saw arm 17, which is FIG. 2A As shown, the pivot angle is 0° and the rotation axis 19 of the saw blade 16 lies in the depth direction 52 above the pivot axis 23. The saw blade 16 is moved from the basic position at 0° into the workpiece 24 by a pivoting movement of the saw arm 17 about the pivot axis 23. During the pivoting movement of the saw arm 17, the saw blade 16 is driven by the drive motor 18 about the rotation axis 19.

[0053] To protect the operator, the saw blade 16 should be surrounded by the blade guard 21 during operation. The wall saw 12 can be operated with or without the blade guard 21. For example, to process the separating cut in the area of ​​the end points E 1 , E 2 , the blade guard 21 can be removed. If different saw blade diameters are used to process the separating cut, different blade guards with corresponding blade guard widths are generally also used.

[0054] FIG. 2B shows the saw arm 17, which rotates in a negative direction 54 is inclined at a negative pivot angle -α. The saw arm 17 is adjustable in the negative rotation direction 54 between pivot angles of 0° to -180° and in a positive rotation direction opposite to the negative rotation direction 54 55 adjustable between swivel angles of 0° to +180°. FIG. 2B The arrangement of the saw arm 17 shown is referred to as a pulling arrangement when the saw head 14 is in a positive feed direction 56 If the saw head 14 is moved in a negative feed direction opposite to the positive feed direction 56 57 moves, the arrangement of the saw arm 17 is called a pushing arrangement.

[0055] At a swivel angle of ±180°, the maximum penetration depth of the saw blade 16 into the workpiece 24 is achieved. The swivel movement of the saw arm 17 around the swivel axis 23 shifts the position of the rotation axis 19 in the X and Y directions. The displacement of the rotation axis 19 depends on the saw arm length δ and the swivel angle α of the saw arm 17. The displacement δ x in the X direction is δ sin(±α), and the displacement δ y in the Y direction is δ cos(±α).

[0056] The saw blade 16 creates a cutting wedge in the workpiece 24 in the shape of a circular segment with a height h and a width b. The height h of the circular segment corresponds to the penetration depth of the saw blade 16 into the workpiece 24. The relationship D / 2 = h + Δ + δ cos(α) applies to the penetration depth h, where D is the saw blade diameter, h is the penetration depth of the saw blade 16, Δ is the vertical distance between the pivot axis 23 and the top side 53 of the workpiece 24, δ is the saw arm length and α is the first pivot angle, and the relationship b 2< = D / 2 8h - 4h 2< = 4Dh - 4h 2< = 4h (D - h) applies to the width b, where h is the penetration depth of the saw blade 16 into the workpiece 24 and D is the saw blade diameter.

[0057] The control of the wall saw 12 during the separating cut depends on whether the end points are defined as obstacles, and in the case of an obstacle, whether the processing is carried out with or without the blade guard 21. In the case of a free end point without an obstacle, the control of the wall saw 12 in the method according to the invention is carried out via upper exit points of the saw blade 16 on the upper side 53 of the workpiece 24. The upper exit points of the saw blade 16 can be calculated from the reference position X Ref of the pivot axis 23 in the X direction, the displacement path δ x of the rotation axis 19 in the X direction and the width b. An upper exit point facing the first end point E 1 is referred to as the first upper exit point 58 and an upper exit point facing the second end point E 2 is referred to as the second upper exit point 59.For the first upper exit point 58, X(58) = X Ref + δ x - b / 2 applies and for the second upper exit point 59, X(59) = X Ref + δ x + b / 2 applies with b = √[h · (D - h)] and h = h(α, D).

[0058] If the end points E 1 , E 2 are defined as obstacles, it is not possible to cross the end points E 1 , E 2 with the wall saw 12. In this case, the control of the wall saw 12 in the method according to the invention takes place via the reference position X Ref of the pivot axis 23 and the limitation of the wall saw 12. A distinction is made between machining without blade guard 21 and machining with blade guard 21.

[0059] FIGN. 3A , B show the wall sawing system 10 during the creation of a separating cut between the first end point E 1 and the second end point E 2 , which are defined as obstacles, wherein the processing is carried out without blade guard 21. When processing without blade guard 21, a first saw blade edge 61,which faces the first end point E 1, and a second saw blade edge 62, which faces the second end point E 2, the boundary of the wall saw 12.

[0060] The X-positions of the first and second saw blade edges 61, 62 in the X-direction can be calculated from the reference position X Ref of the pivot axis 23, the displacement path δ x of the rotation axis 19 and the saw blade diameter D. FIG. 3A shows the wall saw 12 with the saw arm 17 inclined in the negative direction of rotation 54 at a negative pivot angle -α (0° to -180°). For the first saw blade edge 61, X(61) = X Ref + δ · sin(-α) - D / 2 applies and for the second saw blade edge 62, X(62) = X Ref + δ · sin(-α) + D / 2 applies. FIG. 3B shows the wall saw 12 with the saw arm 17 inclined in the positive direction of rotation 55 at a positive pivot angle α (0° to +180°). For the first saw blade edge 61, X(61) = X Ref + δ · sin(α) - D / 2 applies and for the second saw blade edge 62, X(62) = X Ref + δ · sin(α) + D / 2 applies.

[0061] FIGN. 4A , B show the wall saw system 10 during the creation of a separating cut between the first end point E 1 and the second end point E 2 , which are defined as obstacles, with the processing being carried out with blade protection 21. When processing without blade protection 21, a first blade protection edge 71, which faces the first end point E 1, and a second blade protection edge 72, which faces the second end point E 2, the boundary of the wall saw 12.

[0062] The X-positions of the first and second blade guard edges 71, 72 in the X-direction can be calculated from the reference position X Ref of the swivel axis 23, the displacement path δ x of the rotation axis 19 and the blade guard width B. FIG. 4A shows the wall saw 12 with the saw arm 17 inclined at a negative pivot angle -α (0° to -180°) and the mounted blade guard 21 of blade guard width B. In the case of an asymmetrical blade guard, the distances of the rotation axis 19 to the blade guard edges 71, 72 are determined before the start of the controlled machining, wherein the distance to the first blade guard edge 71 is referred to as the first distance B a and the distance to the second blade guard edge 72 is referred to as the second distance B b.

[0063] For the first blade protection edge 71, X(71) = X Ref + δ · sin(α) - B a and for the second blade protection edge 72, X(72) = X Ref + δ · sin(α) + B b . FIG. 4B shows the wall saw 12 with the saw arm 17 inclined at a positive swivel angle α (0° to +180°) and the mounted blade guard 21 of blade guard width B. For the first blade guard edge 71, X(71) = X Ref + δ · sin(α) - B a applies and for the second blade guard edge 72, X(72) = X Ref + δ · sin(α) + B b applies.

[0064] FIGN. 2A , B show a cut between two endpoints E 1 , E 2 , which are defined as free endpoints without obstacle, and FIGN. 3A , B and 4A, B show a separating cut between two end points E 1 , E 2 , which are defined as obstacles. In practice, separating cuts are also possible in which one end point is defined as an obstacle and the other end point represents a free end point without an obstacle, whereby the control of the wall saw at the free end point is via the upper exit point of the saw blade and at the obstacle via the saw blade edge (processing without blade guard 21) or the blade guard edge (processing with blade guard 21).

[0065] The first upper exit point 58, the first saw blade edge 61 and the first blade protection edge 71 are collectively referred to as the "first boundary" of the wall saw 12, and the second upper exit point 59, the second saw blade edge 62 and the second blade protection edge 72 are collectively referred to as the "second boundary".

[0066] FIGN. 5A-N show the wall saw system 10 of the FIG. 1 with the guide rail 11 and the wall saw 12 when creating a separating cut of final depth T in the workpiece 24 between the first end point E 1 , which is defined as a free end point without obstacles, and the second end point E 2 , which is also defined as a free end point without obstacles. The wall saw 12 is controlled at the first end point E 1 via the first upper exit point 58 of the saw blade used and at the second end point E 2 via the second upper exit point 59 of the saw blade used.

[0067] In the method according to the invention, the separating cut comprises a main cutting sequence of at least two main cuts performed between the first end point E 1 and the second end point E 2 . In addition, a first corner machining operation is performed at the first end point E 1 and a second corner machining operation is performed at the second end point E 2 , which are not part of the method according to the invention. If an overlap is permitted at an end point, an overlap sequence is defined for the free end point; otherwise, a corner cutting sequence is defined.

[0068] The main cutting sequence includes a first main cut with a first main cutting angle α 1 of the saw arm 17, a first diameter D 1 of the saw blade used, a first penetration depth h 1 of the saw blade used into the workpiece 24 and a first width B 1 of the blade protection used and a subsequent second main cut with a second main cutting angleα 2 of the saw arm 17, a second diameter D 2 of the saw blade used, a second penetration depth h 2 of the saw blade used into the workpiece 24 and a second width B 2 of the sheet protection used.

[0069] In the exemplary embodiment, the first and second main cuts are carried out using the same saw blade 16 and the same blade guard 21. Therefore, the first diameter D 1 of the first main cut and the second diameter D 2 of the second main cut correspond to the saw blade diameter D of the saw blade 16, and the first width B 1 of the first main cut and the second width B 2 of the second main cut correspond to the blade guard width B of the saw blade 16. In the exemplary embodiment, the blade guard 21 is constructed symmetrically, and the distance between the axis of rotation 19 and the blade guard edges 71, 72 corresponds to B / 2. With an asymmetric blade guard, the first distance B a to the first blade guard edge 71 and the second distance B b to the second blade guard edge 72 are used.

[0070] FIG. 5A shows the wall saw 12 in the assembly position X 0 of the saw head 14 and the basic position 0° of the saw arm 17. After starting the method according to the invention, the saw head 14 is moved from the assembly position X 0 into a starting position X Start procedure ( FIG. 5B ). In the exemplary embodiment, the machining of the first main cut begins at the first end point E 1 . In the starting position X 1 , the pivot axis 23 has a distance of √[h 1 · (D 1 - h 1 )] - δ · sin(-α 1 ) to the first end point E 1 , where h 1 = h(-α 1 , D 1 ) = D 1 / 2 - Δ - δ · cos(-α 1 ) denotes the penetration depth of the saw blade 16 used into the workpiece 24 at the negative first main cutting angle -α 1 .

[0071] To insert the saw blade 16 into the workpiece 24, the saw blade 16 is driven by the drive motor 18 about the rotation axis 19 and the saw arm 17 is pivoted from the home position 0° in the negative rotation direction 54 about the pivot axis 23. The pivot angle of the saw arm 17 is regularly measured by the pivot angle sensor 32 during the pivoting movement. As soon as the negative first main cutting angle -α 1 is reached, the pivoting movement of the saw arm 17 is interrupted ( FIG. 5C ). When positioning the saw head 14 in FIG. 5B the distance to the first end point E 1 was set such that the first upper exit point 58 of the saw blade 16 facing the first end point E 1 coincides with the first end point E 1 after the pivoting movement of the saw arm 17 into the negative first main cutting angle -α 1 .

[0072] The saw head 14 is moved in the positive feed direction 56 towards the second end point E 2 ( FIG. 5D ). During the feed movement, the position of the saw head 14 is regularly measured by the displacement sensor 33. The feed movement is stopped when the pivot axis 23 has a distance of √[h 1 · (D, - h 1 )] + δ · sin(-α 1 ) from the second end point E 2 ( FIG. 5E ). The saw arm 17 is then pivoted in the positive direction of rotation 55 about the pivot axis 23 from the negative first main cutting angle -α 1 to the positive first main cutting angle +α 1 ( FIG. 5F ). When calculating the distance to the second end point E 2 , the displacement of the rotation axis 19 due to the pivoting from -α 1 to +α 1 was taken into account. The distance was set such that the second upper exit point 59 of the saw blade 16 facing the second end point E 2 coincides with the second end point E 2 after the pivoting movement of the saw arm 17 into the positive first main cutting angle +α 1 .

[0073] By pivoting the saw arm 17, residual material remains in the area of ​​the pivot axis 23, which still has to be removed by the saw blade 16. The residual material can be removed in a separate step or the residual material is removed during the following main cut. FIG. 5G In the embodiment shown, the remaining material is completely removed in the first main cut. For this purpose, the saw head 14 is moved in the negative feed direction 57 after pivoting by a distance of 2δ · |sin(-α 1 )| ( FIG. 5G ). After removal, the first main cut is completed and the second main cut begins with the positioning of the saw head 14.

[0074] The saw head 14 is positioned in the feed direction 28 such that the pivot axis 23 has a distance of √[h 2 · (D 2 - h 2 )] + δ · sin(+α 2 ) to the second end point E 2 ( FIG. 5H ). In this position, the saw arm 17 is pivoted from the positive first main cutting angle +α 1 to the positive second main cutting angle +α 2 ( FIG. 5I ). When positioning in FIG. 5H the distance is set so that the second upper exit point 59 of the saw blade 16 facing the second end point E 2 coincides with the second end point E 2 after the pivoting movement of the saw arm 17 into the positive second main cutting angle +α 2 .

[0075] The saw head 14 is moved in the negative feed direction 57 towards the first end point E 1 ( FIG. 5J ), whereby the position of the saw head 14 is regularly measured by the displacement sensor 33 during the feed movement. The feed movement is stopped when the pivot axis 23 has a distance of √[h 2 · (D 2 - h 2 )] - δ · sin(+α 2 ) from the first end point E 1 ( FIG. 5K ). The saw arm 17 is pivoted in the negative direction of rotation 54 and arranged in the negative second main cutting angle -α 2 ( FIG. 5L ). When setting the distance to the first end point E 1 in FIG. 5K the distance was set so that the first upper exit point 58 of the saw blade 16, facing the first end point E 1, coincides with the first end point E 1 after the pivoting movement of the saw arm 17 into the negative second main cutting angle -α 2 .

[0076] To remove the remaining material, the saw head 14 is displaced in the positive feed direction 56 by a path length of 2δ · |sin(-α 2 )| ( FIG. 5M ). After removal, the second main cut and thus also the separating cut between the first and second end points E 1 , E 2 are completed. At the end of the method according to the invention, the saw arm 17 is moved to the basic position 0° ( FIG. 5N ).

[0077] In the FIGN. 5E bis 5H a complete removal of the residual material at the end of the first main cut and the positioning of the saw head 14 for the second main cut are shown. In a first alternative variant, the removal of the residual material and the positioning of the saw head 14 are combined. After the saw arm 17 has been pivoted into the positive first main cutting angle +α 1 , the saw head 14 is moved in the negative feed direction 57 until the pivot axis 23 has a distance of √[h 2 · (D 2 - h 2 )] - δ · sin(+α 2 ) from the second end point E 2 . The distance is set such that the second upper exit point 59 of the saw blade 16 coincides with the second end point E 2 after the pivoting movement of the saw arm 17 into the positive second main cutting angle +α 2 .

[0078] In an alternative second variant, the removal of the residual material is omitted. The saw head 14 is stopped by the control unit 29 in a position in which the pivot axis 23 in the feed direction 28 has a distance of √[h 2 · (D 2 - h 2 )] - δ · sin(+α 2 ) from the second end point E 2. In this position, the saw arm 17 is pivoted from the negative first main cutting angle -α 1 to the positive second main cutting angle +α 2. The distance is set such that the second upper exit point 59 of the saw blade 16 facing the second end point E 2 coincides with the second end point E 2 after the pivoting movement of the saw arm 17 into the positive second main cutting angle +α 2. The variant without removal of the residual material has the lowest non-productive times of the three variants; However, a powerful drive motor 18 is required that can handle the greater cutting depth at the end point.

[0079] FIGN. 5A-N show a main cutting sequence with a first and second main cut. The number of main cuts depends, among other things, on the final depth T of the severing cut, the material of the workpiece 24, and the power of the drive motor 18. The main cutting angles α i and penetration depths hi of the individual main cuts can be specified by the operator, or the control unit 29 of the wall saw 12 calculates the main cutting angles or penetration depths for the individual main cuts from the boundary conditions of the severing cut.

[0080] FIGN. 6A-H show the wall sawing system 10 with the wall saw 12 during the creation of a further separating cut between a first end point E 1 , which represents an obstacle, and a second end point E 2 , which is defined as a free end point without an obstacle. The wall saw 12 is controlled at the first end point E 1 via the first saw blade edge 61 (without blade guard 21) or the first blade guard edge 71 (with blade guard 21), and at the second end point E 2 via the second upper exit point 59 of the saw blade used.

[0081] In the method according to the invention, the separating cut is created in a main cutting sequence of several main cuts until the desired final depth T is reached. In addition to the main cutting sequence, corner processing in the form of obstacle processing is carried out at the first end point E 1 and corner processing in the form of overcut processing is carried out at the second end point E 2, whereby the corner processing at the first and second end points is not part of the method according to the invention.

[0082] The main cutting sequence includes a first main cut with a first main cutting angle α 1 of the saw arm 17, a first diameter D 1 and a first penetration depth h 1 of the saw blade used, a second main cut with a second main cutting angle α 2 of the saw arm 17, a second diameter D 2 and a second penetration depth h 2 of the saw blade used and a third main cut with a third main cutting angle α 3 of the saw arm 17, a third diameter D 3 and a third penetration depth h 3 of the saw blade used.

[0083] The first main cut is made in the example with a first saw blade 16.1 and a first blade protection 21.1 carried out, wherein the first saw blade 16.1 has a first saw blade diameter D.1 and the first blade guard 21.1 has a first blade guard width B.1 The first diameter D 1 of the first main cut corresponds to the first saw blade diameter D.1 of the first saw blade 16.1, and the first width B 1 of the first main cut corresponds to the first blade guard width B.1 of the first blade guard 21.1.

[0084] The second main cut and the third main cut are made in the example with a second saw blade 16.2 and a second blade guard 21.2 The second saw blade 16.2 has a second saw blade diameter D.2 and the second blade guard 21.2 a second blade guard width B.2 The second diameter D 2 of the second main cut and the third diameter D 3 of the third main cut correspond to the second saw blade diameter D.2 of the second saw blade 16.2; likewise, the second width B 2 of the second main cut and the third width B 3 of the third main cut correspond to the second blade guard width B.2 of the second blade guard 21.2.

[0085] The processing of the separating cut begins at the first end point E 1 . Since the first blade guard 21.1 is mounted, the control of the wall saw 12 takes place at the first end point E 1 via the first blade guard edge 71.1 of the first blade guard 21.1. After the start of the method according to the invention, the saw head 14 is positioned in a starting position in which the pivot axis 23 has a distance of B 1 / 2 - δ sin(-α 1 ) from the first end point E 1. In the starting position, the saw arm 17 is pivoted from the basic position 0° in the negative direction of rotation 54 into the negative first main cutting angle -α 1 and the saw head 14 is moved with the saw arm 17 inclined at -α 1 in the positive feed direction 56 ( FIG. 6A ).

[0086] The saw head 14 is moved in the positive feed direction 56 until the pivot axis 23 is at a distance of √[h 1 · (D, - h 1 )] + δ · sin(+α 1 ) from the second end point E 2 , where h 1 = h(+α 1 , D 1 ) = D 1 / 2 - Δ - δ · cos(+α 1 ) denotes the penetration depth of the first saw blade 16.1 into the workpiece 24 at the positive first main cutting angle +α 1 with the first diameter D 1 , which corresponds to the first saw blade diameter D.1. The saw arm 17 is then pivoted in the positive direction of rotation 55 into the positive first main cutting angle +α 1 and the residual material is removed.

[0087] To change the saw blade from the first saw blade 16.1 to the second saw blade 16.2, the saw head 14 is positioned in a parking position and the saw arm 17 is pivoted into the basic position of 0° ( FIG. 6B The parking position is selected to allow the first saw blade 16.1 and first blade guard 21.1 to be swung out and removed, as well as the second saw blade 16.2 and second blade guard 21.2 to be mounted and swung in. Furthermore, the travel path of the saw head 14 for the second main cut should be as short as possible; ideally, the parking position corresponds to the starting position for the second main cut. Controlling the wall saw when changing the saw blade and blade guard is not part of the method according to the invention.

[0088] Since the second end point E 2 represents a free end point without any obstacles, the disassembly of the first saw blade 16.1 and first blade guard 21.1 as well as the assembly of the second saw blade 16.2 and second blade guard 21.2 are possible without any problems. In the parking position, the pivot axis has a distance of √[h 2 · (D 2 - h 2 )] + δ · sin(+α 2 ) to the second end point E 2, where h 2 = h(+α 2 , D 2 ) = D 2 / 2 - Δ - δ · cos(+α 2 ) denotes the penetration depth of the saw blade 16.2 used into the workpiece 24 at the positive second main cutting angle +α 2 with the second diameter D 2 , which corresponds to the second saw blade diameter D.2. The distance was set in the parking position so that the second upper exit point 59.2 of the second saw blade 16.2, facing the second end point E 2, coincides with the second end point E 2 after the pivoting movement of the saw arm 17 into the positive second main cutting angle +α 2 ( FIG. 6C ).

[0089] After mounting the second saw blade 16.2 and second blade guard 21.2 and resuming controlled machining, the wall saw 12 is positioned in the parking position. The saw head 14 is moved in the negative feed direction 57 with the saw arm 17 inclined at the positive second main cutting angle +α 2 and the rotating second saw blade 16.2. The transition from the second main cut to the third main cut is achieved by completely removing the remaining material ( FIG. 6D ) or alternatively by partially removing the remaining material or without removal. The wall saw is controlled by means of the first blade guard edge 71.2 of the second blade guard 21.2. The positioning of the saw head 14 for the third main cut with a main cutting angle of -α 3 = -180° is carried out by means of the critical angle α crit of -90°. The pivot axis 23 has a distance of B.2 / 2 - δ · sin(-90°) = B.2 / 2 + δ from the first end point E 1. The saw arm 17 is then pivoted into the negative third main cutting angle of -α 3 = -180° ( FIG. 6E ).

[0090] The third main cut represents the last main cut of the main cutting sequence, and before machining the last main cut, a corner machining of the first end point E 1 takes place, which is not part of the method according to the invention. For corner machining, the saw head 14 is tilted at -α 3 = -180° with the saw arm 17 ( FIG. 6F ) in the negative feed direction 57 until the first blade guard edge 71.2 of the second blade guard 21.2 coincides with the first end point E 1 . The corner machining of the first end point E 1 can be improved if the second blade guard 21.2 is removed and the corner machining is carried out without the blade guard. Without the blade guard, the saw head 14, with the saw arm 17 inclined at -α 3 = -180°, is moved in the negative feed direction 57 until the first saw blade edge 61.2 of the second saw blade 16.2 coincides with the first end point E 1 .

[0091] After corner machining of the first end point E 1 , the third main cut is carried out with the saw arm 17 inclined at the negative third main cutting angle -α 3 in the positive feed direction 56. The feed movement of the saw head 14 is stopped when the pivot axis 23 has a distance of √[h 3 · (D 3 - h 3 )] + δ · sin(180°) = √[h 3 · (D 3 - h 3 )] to the second end point E 2 , where h 3 = h(-α 3 , D 3 ) = D 3 / 2 - Δ - δ · cos(-180°) = D 3 / 2 - Δ + δ denotes the penetration depth of the saw blade into the workpiece 24 at the negative third main cutting angle -α 3 = -180° with the third diameter D 3 , which corresponds to the second saw blade diameter D.2. In the embodiment of the FIGN. 6A-H After the last main cut, the corner of the second end point E 2 ( FIG. 6H ), which is not part of the process according to the invention.

[0092] In the FIGN. 5A-N and FIGN. 6A-HFor the separating cuts shown, the pivoting movement of the saw arm 17 into a main cutting angle is carried out in one pivoting movement each time. With hard materials or less powerful drive motors 18 for the saw blade 16, the pivoting movement of the saw arm 17 can be carried out in at least two steps with an intermediate angle, with the saw blade 16 being cut free between the pivoting movements into the intermediate angles. Carrying out the pivoting movement of the saw arm 17 in at least two steps with an intermediate angle is not part of the method according to the invention.

Claims

1. Method for controlling a wall-saw system (10) comprising a guide rail (11) and comprising a wall saw (12) with a saw head (14), with a motorized feed unit (15) which displaces the saw head (14) parallel to a feed direction (28) along the guide rail (11), with at least one saw blade (16) which is fastened to a saw arm (17), pivotable about a pivot axis (23), of the saw head (14) and is driven about an axis of rotation (19), and with at least one releasable blade guard (21), surrounding the saw blade (16), when producing a separating cut (51) of end depth (T) in a workpiece (24) of workpiece thickness (d) between a first end point (E1) and a second end point (E2), comprising: ■ before the start of a machining of the separating cut (51) that is controlled by a control unit (29) of the wall saw (12), at least the saw-blade diameter (D) of the at least one saw blade (16), the positions of the first and second end points (E1, E2) in the feed direction (28), the end depth (T) of the separating cut (51) and a main-cut sequence of m main cuts (m ≥ 2) are determined, wherein the main-cut sequence comprises at least a first main cut with a first main-cut angle (α1) of the saw arm (17) and a first diameter (D1) of the saw blade used during the first main cut and a following second main cut with a second main-cut angle (α2) of the saw arm (17) and a second diameter (D2) of the saw blade used during the second main cut, ■ during the machining controlled by the control unit (29), - the saw arm (17) is arranged at the negative first main-cut angle (-α1) in a negative direction of rotation (54), - the saw head (14) is moved in a positive feed direction (56) in the direction of the second end point (E2) during the first main cut, wherein the saw arm (17) arranged at the negative first main-cut angle (-α1) is in a pulling arrangement, and - the saw arm (17) is pivoted in a positive direction of rotation (55), which is directed counter to the negative direction of rotation (54), from the negative first main-cut angle (-α1) into a new pivot angle (+α1, +α2), characterized in that, before the start of the machining controlled by the control unit (29), in addition a saw-arm length (δ) of the saw arm (17), which is defined as a distance between the pivot axis (23) of the saw arm (17) and the axis of rotation (19) of the saw blade (16), a distance (Δ) between the pivot axis (23) and the top side (53) of the workpiece (24), a first width (B1) for a blade guard used during the first main cut and a second width (B2) for a blade guard used during the second main cut are determined, wherein the first and second widths (B1, B2) are each made up of a first distance (B1a, B2a) of the axis of rotation (19) from the first blade-guard edge (71) and a second distance (B1b, B2b) of the axis of rotation (19) from the second blade-guard edge (72), and the saw head (14) is stopped during the controlled machining in a position in which a pivoting movement of the saw arm (17) into a new pivot angle (+α1, +α2) takes place, wherein, after the pivoting movement of the saw arm (17) into the new pivot angle (+α1, +α2), a second boundary (59, 62, 72), facing towards the second end point (E2), of the wall saw (12) coincides with the second end point (E2), wherein the second boundary (59, 62, 72) of the wall saw (12) is formed by a second upper exit point (59), facing towards the second end point (E2), of the used saw blade at a top side (53) of the workpiece (24) if the second end point (E2) constitutes a free end point without an obstacle, by a second saw-blade edge (62), facing towards the second end point (E2), of the used saw blade if the second end point (E2) constitutes an obstacle and the machining takes place without a blade guard, and by a second blade-guard edge (72), facing towards the second end point (E2), of the used blade guard if the second end point (E2) constitutes an obstacle and the machining takes place with a blade guard.

2. Method according to Claim 1, characterized in that the saw arm (17) is pivoted in the positive direction of rotation (55) from the negative first main-cut angle (-α1) into the positive first main-cut angle (+α1) and, after the pivoting movement into the positive first main-cut angle (+α1), the second upper exit point (59) of the used saw blade coincides with the second end point (E2) if the pivot axis (23) is at a distance of √[h1 · (D1 - h1)] + δ · sin(+α1) from the second end point (E2), where h1 = h(+α1, D1) = D1 / 2 - Δ - δ · cos(+α1) denotes the penetration depth of the used saw blade into the workpiece (24) at the positive first main-cut angle (+α1) with the first diameter (D1), the second saw-blade edge (62) of the used saw blade coincides with the second end point (E2) if the pivot axis (23) is at a distance of D1 / 2 + δ · sin(+α1) from the second end point (E2), and the second blade-guard edge (72) of the used blade guard coincides with the second end point (E2) if the pivot axis (23) is at a distance of B1b + δ · sin(+α1) from the second end point (E2).

3. Method according to Claim 2, characterized in that the saw head (14) is moved in a negative feed direction (57), directed counter to the positive feed direction (56), by a travel length of at least 2δ · |sin(+α1)|, and the saw head (14) is subsequently positioned in such a way that, after the pivoting movement of the saw arm (17) into the positive second main-cut angle (+α2), the second boundary (59, 62, 72) of the wall saw (12) coincides with the second end point (E2), wherein the second upper exit point (59) of the used saw blade coincides with the second end point (E2) if the pivot axis (23) is at a distance of √[h2 · (D2 - h2)] + δ · sin(+α2) from the second end point (E2), where h2 = h(+α2, D2) = D2 / 2 - Δ - δ · cos(+α2) denotes the penetration depth of the used saw blade into the workpiece (24) at the positive second main-cut angle (+α2) with the second diameter (D2), the second saw-blade edge (62) of the used saw blade coincides with the second end point (E2) if the pivot axis (23) is at a distance of D2 / 2 + δ · sin(+α2) from the second end point (E2), and the second blade-guard edge (72) of the used blade guard coincides with the second end point (E2) if the pivot axis (23) is at a distance of B2b + δ · sin(+α2) from the second end point (E2).

4. Method according to Claim 2, characterized in that the saw head (14) is moved in the negative feed direction (57) in such a way that, after the pivoting movement of the saw arm (17) into the positive second main-cut angle (+α2), the second boundary (59, 62, 72) of the wall saw (12) coincides with the second end point (E2), wherein the second upper exit point (59) of the used saw blade coincides with the second end point (E2) if the pivot axis (23) is at a distance of √[h2 · (D2 - h2)] + δ · sin(+α2) from the second end point (E2), where h2 = h(+α2, D2) = D2 / 2 - Δ - δ · cos(+α2) denotes the penetration depth of the used saw blade into the workpiece (24) at the positive second main-cut angle (+α2) with the second diameter (D2), the second saw-blade edge (62) of the used saw blade coincides with the second end point (E2) if the pivot axis (23) is at a distance of D2 / 2 + δ · sin(+α2) from the second end point (E2), and the second blade-guard edge (72) of the used blade guard coincides with the second end point (E2) if the pivot axis (23) is at a distance of B2b + δ · sin(+α2) from the second end point (E2).

5. Method according to Claim 1, characterized in that the saw arm (17) is pivoted in the positive direction of rotation (55) from the negative first main-cut angle (-α1) into the positive second main-cut angle (+α2) and, after the pivoting movement into the positive second main-cut angle (+α2), the second upper exit point (59) of the used saw blade coincides with the second end point (E2) if the pivot axis (23) is at a distance of √[h2 · (D2 - h2)] + δ · sin(+α2) from the second end point (E2), where h2 = h(+α2, D2) = D2 / 2 - Δ - δ · cos(+α2) denotes the penetration depth of the used saw blade into the workpiece (24) at the positive second main-cut angle (+α2) with the second diameter (D2), the second saw-blade edge (62) of the used saw blade coincides with the second end point (E2) if the pivot axis (23) is at a distance of D2 / 2 + δ · sin(+α2) from the second end point (E2), and the second blade-guard edge (72) of the used blade guard coincides with the second end point (E2) if the pivot axis (23) is at a distance of B2b + δ · sin(+α2) from the second end point (E2).

6. Method according to one of Claims 3 to 5, characterized in that the saw head (14) is moved with the saw arm (17), inclined at the positive second main-cut angle (+α2), in the negative feed direction (57).

7. Method according to Claim 6, characterized in that, during the machining controlled by the control unit (29), the saw head (14) is moved in such a way that, after the pivoting movement of the saw arm (17) from the positive second main-cut angle (+α2) into a new pivot angle (-α2, -α3), a first boundary (58, 61, 71), facing towards the first end point (E1), of the wall saw (12) coincides with the first end point (E1), wherein the first boundary (58, 61, 71) of the wall saw (12) is formed by a first upper exit point (58), facing towards the first end point (E1), of the used saw blade at the top side (53) of the workpiece (24) if the first end point (E1) constitutes a free end point without an obstacle, by a first saw-blade edge (61), facing towards the first end point (E1), of the used saw blade if the first end point (E1) constitutes an obstacle and the machining takes place without a blade guard, and by a first blade-guard edge (71), facing towards the first end point (E1), of the used blade guard if the first end point (E1) constitutes an obstacle and the machining takes place with a blade guard.

8. Method according to Claim 7, characterized in that the second main cut constitutes the last main cut of the main-cut sequence, the saw arm (17) is pivoted in the negative direction of rotation (54) from the positive second main-cut angle (+α2) into the negative second main-cut angle (-α2) and, after the pivoting movement into the negative second main-cut angle (-α2), the first upper exit point (58) coincides with the first end point (E1) if the pivot axis (23) is at a distance of √[h2 · (D2 - h2)] + δ · sin(-α2) from the first end point (E1), where h2 = h(-α2, D2) = D2 / 2 - Δ - δ · cos(-α2) denotes the penetration depth of the used saw blade into the workpiece (24) at the negative second main-cut angle (-α2) with the second diameter (D2), the first saw-blade edge (61) of the used saw blade coincides with the first end point (E1) if the pivot axis (23) is at a distance of D2 / 2 - δ · sin(-α2) from the first end point (E1), and the first blade-guard edge (71) of the used blade guard coincides with the first end point (E1) if the pivot axis (23) is at a distance of B2a - δ · sin(-α2) from the first end point (E1).

9. Method according to Claim 8, characterized in that the saw head (14) is moved by a travel length of at least 2δ · |sin(-α2)| with the saw arm (17), inclined at the negative second main-cut angle (-α2), in the positive feed direction (56).

10. Method according to Claim 7, characterized in that the main-cut sequence comprises a third main cut, to be carried out after the second main cut, with a third main-cut angle (α3) of the saw arm (17), a third diameter (D3) of the used saw blade and a third width (B3) of the used blade guard with a first and a second distance (B3a, B3b) from the blade-guard edges, wherein, with the third main cut, the saw arm (17) is arranged in a pulling arrangement and the saw head (14) is moved in the positive feed direction (56).

11. Method according to Claim 10, characterized in that the saw head (14) is moved in the negative feed direction (57) in such a way that, after the pivoting movement of the saw arm (17) into the negative second main-cut angle (-α2), the first boundary (58, 61, 71) of the wall saw (12) coincides with the first end point (E1), wherein the first boundary (58, 61, 71) is formed by a first upper exit point (58), facing towards the first end point (E1), of the used saw blade at the top side (53) of the workpiece (24) if the first end point (E1) constitutes a free end point without an obstacle, by a first saw-blade edge (61), facing towards the first end point (E1), of the used saw blade if the first end point (E1) constitutes an obstacle and the machining takes place without a blade guard (21), and by a first blade-guard edge (71), facing towards the first end point (E1), of the used blade guard if the first end point (E1) constitutes an obstacle and the machining takes place with a blade guard (21).

12. Method according to Claim 11, characterized in that the saw head (14) is moved by a travel length of at least 2δ · |sin(-α2)| with the saw arm (17), inclined at the negative second main-cut angle (-α2), in the positive feed direction (56), and the saw head (14) is subsequently positioned in such a way that, after the pivoting movement of the saw arm (17) into the negative third main-cut angle (-α3), the first boundary (58, 61, 71) of the wall saw (12) coincides with the first end point (E1), wherein the first upper exit point (58) of the used saw blade coincides with the first end point (E1) if the pivot axis (23) is at a distance of √[h3 · (D3 - h3)] + δ · sin(-α3) from the first end point (E1), where h3 = h(-α3, D3) = D3 / 2 - Δ - δ · cos(-α3) denotes the penetration depth of the used saw blade into the workpiece (24) at the negative third main-cut angle (-α3) with the third diameter (D3), the first saw-blade edge (61) of the used saw blade coincides with the first end point (E1) if the pivot axis (23) is at a distance of D3 / 2 - δ · sin(-α3) from the first end point (E1), and the first blade-guard edge (71) of the used blade guard coincides with the first end point (E1) if the pivot axis (23) is at a distance of B3a - δ · sin(-α3) from the first end point (E1).

13. Method according to Claim 11, characterized in that the saw head (14) is moved in the positive feed direction (56) in such a way that, after the pivoting movement of the saw arm (17) into the negative third main-cut angle (-α3), the first boundary (58, 61, 71) of the wall saw (12) coincides with the first end point (E1), wherein the first upper exit point (58) of the used saw blade coincides with the first end point (E1) if the pivot axis (23) is at a distance of √[h3 · (D3 - h3)] - δ · sin(-α3) from the first end point (E1), where h3 = h(-α3, D3) = D3 / 2 - Δ - δ · cos(-α3) denotes the penetration depth of the used saw blade into the workpiece (24) at the negative third main-cut angle (-α3) with the third diameter (D3), the first saw-blade edge (61) of the used saw blade coincides with the first end point (E1) if the pivot axis (23) is at a distance of D3 / 2 - δ · sin(-α3) from the first end point (E1), and the first blade-guard edge (71) of the used blade guard coincides with the first end point (E1) if the pivot axis (23) is at a distance of B3a - δ · sin(-α3) from the first end point (E1).

14. Method according to Claim 10, characterized in that the saw arm (17) is pivoted in the negative direction of rotation (54) from the positive second main-cut angle (+α2) into the negative third main-cut angle (-α3) and, after the pivoting movement into the negative third main-cut angle (-α3), the first upper exit point (58) of the used saw blade coincides with the first end point (E1) if the pivot axis (23) is at a distance of √[h3 · (D3 - h3)] - δ · sin(-α3) from the first end point (E1), where h3 = h(-α3, D3) = D3 / 2 - Δ - δ · cos(-α3) denotes the penetration depth of the used saw blade into the workpiece (24) at the negative third main-cut angle (-α3) with the third diameter (D3), the first saw-blade edge (61) of the used saw blade coincides with the first end point (E1) if the pivot axis (23) is at a distance of D3 / 2 - δ · sin(-α3) from the first end point (E1), and the first blade-guard edge (71) of the used blade guard coincides with the first end point (E1) if the pivot axis (23) is at a distance of B3a - δ · sin(-α3) from the first end point (E1).

15. Method according to one of Claims 1 to 14, characterized in that the first and second main cuts are carried out using a saw blade (16) and a blade guard (21).

16. Method according to one of Claims 1 to 14, characterized in that the first main cut is carried out using a first saw blade (16.1) and a first blade guard (21.1), wherein the first saw blade (16.1) has a first saw-blade diameter (D.1) and the first blade guard (21.1) has a first blade-guard width (B.1), and the second main cut is carried out using a second saw blade (16.2) and a second blade guard (21.2), wherein the second saw blade (16.2) has a second saw-blade diameter (D.2) and the second blade guard (21.2) has a second blade-guard width (B.2).

17. Method according to one of Claims 1 to 16, characterized in that the first main cut of the main-cut sequence constitutes a preliminary cut and, after the start of the machining controlled by the control unit (29), the saw head (14) is put into a start position (XStart), wherein, in the start position (XStart), the first boundary (58, 61, 71), facing towards the first end point (E1), of the wall saw (12) coincides with the first end point (E1) after the pivoting movement into the negative first main-cut angle (-α1).

18. Method according to Claim 17, characterized in that the first upper exit point (58) of the used saw blade coincides with the first end point (E1) if the pivot axis (23) is at a distance of √[h1 · (D1 - h1)] - δ · sin(-α1) from the first end point (E1), where h1 = h(-α1, D1) = D1 / 2 - Δ - δ · cos(-α1) denotes the penetration depth of the used saw blade into the workpiece (24) at the negative first main-cut angle (-α1) with the first diameter (D1), the first saw-blade edge (61) of the used saw blade coincides with the first end point (E1) if the pivot axis (23) is at a distance of D1 / 2 - δ · sin(-α1) from the first end point (E1), and the first blade-guard edge (71) of the used blade guard coincides with the first end point (E1) if the pivot axis (23) is at a distance of B1a - δ · sin(-α1) from the first end point (E1).