EP3191279A1

EP3191279A1 - Method for controlling a wall saw system during the creation of a separating cut

Info

Publication number: EP3191279A1
Application number: EP15757272.8A
Authority: EP
Inventors: Wilfried Kaneider; Dragan Stevic; Christian Bereuter; Peter Hricko
Original assignee: Hilti AG
Current assignee: Hilti AG
Priority date: 2014-09-08
Filing date: 2015-09-02
Publication date: 2017-07-19
Anticipated expiration: 2035-09-02
Also published as: US20180169898A1; WO2016037911A1; JP6479168B2; EP3191279B1; US10821630B2; EP2993010A1; JP2017532224A

Abstract

The invention relates to a method for controlling a wall saw system (10) during the creation of a separating cut in a workpiece (24) between a first and a second end point. The wall saw system (10) comprises a wall saw (12). Said wall saw comprises a saw head (14), a pivotable saw arm (17), a first saw blade, and a larger, second saw blade. The separating cut is performed in a plurality of main cuts, wherein the parameters of the main cuts (saw blade diameter of the saw blade used, main-cut angle) are defined before the start in a main-cut sequence. After the processing of the separating cut by means of the first saw blade is concluded, the controlled processing of the separating cut is interrupted by a control unit and the wall saw (12) is moved into a parking position by the control unit. The parking position is selected in such a way that all actions of the saw-blade change (swinging out the saw arm, removing the first saw blade, installing the second saw blade, and swinging in the saw arm) can be performed.

Description

Method for controlling a wall sawing system when creating a separating cut Technical field

The present invention relates to a method for controlling a wall sawing system when creating a separating cut according to the preamble of claim 1.

State of the art

EP 1 693 173 B1 discloses a method for controlling a wall sawing system when creating a separating cut in a workpiece between a first end point and a second end point. The wall saw system comprises a guide rail and a wall saw with a saw head, a motor feed unit which moves the saw head parallel to a feed direction along the guide rail and at least one saw blade mounted on a saw arm of the saw head and driven by a drive motor about an axis of rotation. The saw arm is designed to be pivotable about a pivot axis by means of a swivel motor. By a pivoting movement of the saw arm about the pivot axis, the penetration depth of the saw blade is changed in the workpiece. The motorized feed unit comprises a guide carriage and a feed motor, wherein the saw head is mounted on the guide carriage and moved over the feed motor along the guide rail. For monitoring the wall sawing system, a sensor device with a swivel angle sensor and a displacement sensor is provided. The swivel angle sensor measures the instantaneous 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 of the wall saw.

The known method for controlling a wall sawing system is divided into a preparation part and a processing of the separating cut controlled by the control unit. In the preparation part, the operator sets at least the saw blade diameter of the saw blade, the positions of the first and second end points in the feed direction and the final depth of the separating cut; other parameters can be the material of the machined Workpiece and the dimensions of embedded reinforcing iron. From the parameters entered, the separating cut control unit determines a suitable main cutting sequence of main cuts, the main cutting sequence comprising at least a first main section having a first main cutting angle of the saw arm and a first diameter of the saw blade used, and a following second main section having a second main cutting angle of the saw arm and a first Diameter of the saw blade used.

The known method of controlling a wall sawing system does not disclose details of how to change the saw blade and blade guard during the controlled machining of a severing cut.

Presentation of the invention

The object of the present invention is to develop a method for controlling a wall sawing system with a high processing quality, in which the change of a saw blade and a blade guard is integrated into the controlled processing of a separating cut.

This object is achieved according to the invention in the aforementioned method for controlling a wall saw system by the features of the independent claim. Advantageous developments are specified in the dependent claims.

According to the invention it is provided that after the processing of the separating cut with the first saw blade, the controlled processing of the separating cut is interrupted by the control unit and the wall saw is moved by the control unit in a parking position.

By integrating a blade change and blade guard change into controlled machining with the control unit, all constraints can be taken into account by the control unit and the wall saw can be positioned in a park position where all saw blade and leaf blade change actions can be performed. When replacing the saw blade from a first saw blade to a second saw blade and the blade guard from a first blade guard to a second blade guard as boundary conditions to consider:

^■ disassembly of the first saw blade and first blade guard,

^■ mounting the second saw blade and second blade guard,

^■ Swiveling the saw arm with the first saw blade from the first main cutting angle to the basic position and

^■ Pivoting the saw arm with the second saw blade from the basic position to the second main cutting angle. Preferably, after the saw blade has been changed from the first to the second saw blade and the control processing resumed, the wall saw is positioned by the control unit in a resumption position. If the control unit determines a resumption position in addition to the parking position, the operator can move the wall saw along the guide rail after the interruption by the operator from the parking position by means of the motorized feed unit. The ability to move the wall saw from the parking position is advantageous for vertical or diagonal cuts in a wall in which the parking position is located above a manageable mounting position. To disassemble the first piece of equipment (first saw blade and first blade guard) and mount the second piece of equipment (second blade and second blade guard), the operator moves the saw head to a suitable mounting position. After resuming, the control unit uses the displacement sensor to check the current position of the wall saw. If the current position deviates from the resume position, the wall saw will be positioned in the resume position.

In a preferred embodiment, prior to starting the control controlled by the control unit, a saw arm length, defined as the distance between the swivel axis of the saw arm and the axis of rotation of the saw blade, and a distance between the swivel axis of the saw arm and an upper surface of the work piece are additionally defined , For a controlled processing of a separating cut, the control unit must be aware of various parameters. These include the Sägearmlänge, which represents a fixed device-specific size of the wall saw, and the vertical distance between the pivot axis and the surface of the workpiece, which also depends on the geometry of the wall saw and the geometry of the guide rail used.

When calculating the parking position for a change of the saw blade and / or the blade guard are to be distinguished: The change takes place at a free end point without obstacle (first embodiment), the saw blade is changed at an obstacle without blades (second embodiment), the saw blade and the blade guard are changed at an obstacle to the second blade without blade guard (third embodiment) and the saw blade and blade guard are changed at an obstacle to a second blade and a second blade guard (fourth embodiment).

In the first embodiment, the second end point represents a free end point without obstruction, and the pre-start second saw blade diameter of the second saw blade is used for the calculation of a first parking position and a resumption position corresponding to the first parking position. In this case, the pivot axis in the first parking position is at a distance from the second end point of V [h ₂ ^' (D ₂ -h ₂ )] + δ sin (± a ₂ ), where h ₂ = h (± a ₂ , D.2) = D. 2/2 - Δ - 8 cos (± a ₂ ) denotes the penetration depth of the second saw blade into the workpiece at the second main cutting angle with the preset second saw blade diameter.

As an alternative to the preset second saw blade diameter, the second saw blade diameter of the second saw blade is adjustable between a maximum second saw blade diameter and a minimum second saw blade diameter, wherein the maximum second saw blade diameter is used for the calculation of a second parking position. With a saw blade, the blade diameter changes due to wear during machining and decreases over time, the difference between the maximum and minimum second blade diameters corresponding to the height of the cutting segments.

In the second parking position, the pivot axis has a distance to the second end point of V [h _{2, max} (D _max .2-h ₂ , _max )] + δ sin (± oc ₂ ), where h ₂ , _ma x = h _max (± oc ₂ , D _max. ₂ ) = D _max .2 / 2 - Δ - δ cos (± a ₂ ) denotes the maximum penetration depth of the second saw blade into the workpiece at the second main cutting angle with the maximum second saw blade diameter.

The calculation of the second parking position with the maximum second saw blade diameter ensures that the second parking position is suitable for all actual saw blade diameters of the second saw blade.

The wall saw is positioned after the resumption of the controlled processing in a resumption position, which corresponds to the second parking position. The resumption of controlled machining in the second parking position is possible for all actual saw blade diameters of the second saw blade; However, it has an inaccuracy in the positioning.

Preferably, prior to the resumption of the controlled machining, the actual second saw blade diameter of the second saw blade is entered and used for the calculation of a resumption position. In the newly calculated resumption position, the pivot axis is at a distance from the second end point of [h ₂ (D _rea i.2 -h ₂ )] + δ sin (± a ₂ ), where h ₂ = h (± oc ₂ , D _rBa i.2) = D _rEa | .2 / 2 - Δ - δ cos (± a ₂ ) denotes the penetration depth of the second saw blade into the workpiece at the second main _{cutting angle} with the actual second saw blade diameter. The input of the actual second saw blade diameter allows precise control of the wall saw. The parking position is calculated so that each permitted saw blade diameter for the second saw blade can be mounted. By calculating the resumption position with the actual second saw blade diameter, the control of the wall saw can be done via the upper exit points of the saw blade.

In the further embodiments, the second end point is defined as an obstacle and before the start of the controlled machining an assembly distance is additionally determined, wherein the mounting distance for the calculation of a third to fifth parking position is additionally used. The mounting distance ensures that there is sufficient clearance between the obstacle and the saw blade or between the obstacle and the blade guard for the operator to grip the saw blade or the blade guard.

Depending on the boundary conditions of the machining, the control unit calculates different parking positions. In the third parking position, the first and second saw blades are used without blade protectors. In the fourth parking position, the first blade is surrounded by the first blade guard and the processing with the second blade is done without blade protection. In the fifth parking position, the change is made from the first saw blade with the first blade guard to the second blade with the second blade guard. The parking positions must meet the four boundary conditions (disassembly, mounting, swiveling and swiveling in) and depend on the first main cutting angle of the first main section and on the second main cutting angle of the second main section.

In the third parking position, the processing is carried out with the first and second saw blade without blades. For the main cutting angles three angular ranges -180 ° to 0 °, 0 ° to 90 ° and 90 ° to 180 ° are to be differentiated, so that there are a total of nine different distances for the third parking position.

In the first angular range, before the interruption of the controlled machining, the saw arm is arranged at a negative first main cutting angle between -180 ° and 0 °, and in the third parking position the pivot axis is at a distance from the second end point of maximum value of [0 ^ 2 + A _M ontaga, D _2/2 + A _mounting ] for -180 ° <-ot ₂ S 0 °, maximum value of [Di / 2 + AMontage. D _2/2 + A _mounting, D _2/2 + δ sin (a _2)] for 0 ° <a ₂ <90 ° and the maximum value of [D _t / 2 + A ounting, D _2/2 + AMontage. D _2/2 + 8 sin (90 °)] for 90 ° <(x ₂ <180 °.) For all negative first main cutting angles, the displacement δ sin ^ o ^) is negative and therefore D / 2 + δ sini a <Ό] / 2 + Δ _Μοη , _39β . If the second diameter D ₂ greater than the first diameter D is, in principle applies D ^ 2 + AMontage <D _2/2 + A _M ontage-

In the second angular range of the saw arm is before the interruption of the controlled processing at a positive first main intersection angle between 0 ° and 90 ° and the pivot axis has in the third parking position a distance to the second end point of maximum value of [D 2 + A _M ontage, D ₂ / 2 + A _Mo ntage. Di / 2 + δ · sin ^)] for -180 ° <-a ₂ £ 0 °, Maximum value of [0 ^ 2 + A _on days. D2 2 + A _mounting , D 2 + δ είη ^), 0 ^ 2 + 8 sin (a ₂ )] for 0 ° <a ₂ <90 ° and maximum value of [Dn / 2 + A _Mon iag _e , D _z / 2 + Δ _{Μοπΐ39βΙ} D _2/2 + δ sin (90 °)] for 90 ° <a ₂ <180 °. For all the negative second main cutting angle of displacement is 8 sin (-a ₂₎ negative and therefore basically applies D _2/2 + δ ^■ sin (-a ₂₎ <D _2/2 + A _Mon day _e.

In the third angular range of the saw arm is arranged before the interruption of the controlled processing at a positive first main cutting angle between 90 ° and 180 ° and the pivot axis has in the third parking position a distance to the second end point of maximum value of [D 2 + A _M ontage, D ₂ / 2 + A _Mon days, D, / 2 + δ sin (90 °)] for -180 ° <. -a ₂ £ 0 ° and maximum value of [0 ^ 2 + A _M antage, D _2/2 + A _Mon t _age, D _2/2 + δ ^■ sin (90 °)] for 90 ° <a £ ₂ l 80 ° up.

In a first preferred embodiment, for the calculation of the third parking position for the first diameter of the first main section, the preset first saw blade diameter of the first saw blade and for the second diameter of the second main section of the preset second saw blade diameter of the second saw blade is used. Preferably, after the resumption of controlled processing, the wall saw is positioned by the control unit in a resumption position corresponding to the third parking position.

In a second preferred embodiment, the second saw blade diameter is adjustable between a maximum second saw blade diameter and a minimum second saw blade diameter, and the maximum second saw blade diameter is used to calculate the parking position for the second diameter of the second main cut. By calculating the parking position with the maximum second saw blade diameter, it is ensured that the parking position is suitable for all actual saw blade diameters of the second saw blade.

In this case, the wall saw is either positioned in a resumption position that corresponds to the parking position, or before the resumption of controlled machining, the actual second saw blade diameter of the second saw blade is entered and used for the calculation of a resumption position. The pivot axis points in the resume position a distance to the second end point of D _rea i.2 / 2 for -180 ° <> -a ₂ £ 0 °, D _re ai.2 / 2 + δ · si ^' n (a ₂ ) for 0 ° <a ₂ £ 90 ° and D _rea i.2 / 2 + δ sin (90 °) for 90 ° <a ₂ sl 80 °.

In the third embodiment, prior to the start of the controlled machining for the first blade, a first blade guard having a first blade guard width is defined, wherein the first blade guard width is composed of a first distance of the pivot axis to the first blade guard edge and a second distance of the pivot axis to the second blade guard edge is and the second distance is additionally used for the calculation of the fourth parking position. When working with the first blade guard, the fourth parking position depends on the first and second main cutting angles. For the main cutting angles in each case three angular ranges of - 80 ° to 0 °, 0 ° to 90 ° and 90 ° to 180 ° to distinguish, so that a total of nine different distances for the fourth parking position result.

In the first angular range of the saw arm is before the interruption of the controlled machining at a negative first main intersection angle between -180 ° and 0 arranged and the pivot axis has in the fourth parking position a distance to the second end point of maximum value of [B _b .1 + A _MontagBl D _2nd / 2 + AMontage] to -180 ° <, -a ₂ £ 0 °, maximum value of [B + _b .1 ÄMomage, D _2/2 + shelf, D _2/2 + 6 sin (a _2)] for 0 ° <a ₂ -S 90 ° and maximum value of [B _b _. 1 + A _M on.ag _e , D ^ + A _Mounting , D _a / 2 + δ sin (90 °)] for 90 ° <a ₂ <180 ° on.

In the second angular range of the saw arm is located before the interruption of the controlled processing at a positive first main intersection angle between 0 ° and 90 ° and the pivot axis has in the fourth parking position a distance to the second end point of maximum value of [B _b .1 + AMontage, D ₂ / 2 + A ntage _Mo, B _b + .1 δ ^■ sin ^)] to -180 ° s -a ₂ <0 °, maximum value of [B + A _b .1 _Mont age, D _2/2 + A _Monta g _e , B _b .1 + δ sin (a,), D _2/2 + δ sin (a ₂ )] for 0 ° <a ₂ s 90 ° and maximum value of [B _b .1 + A _Monlage , D ₂ / 2 + A _Mo ntage> ^B t> -1 + δ sin ^), D _2/2 + δ sin (90 °)] for 90 ° <a ₂ <180 °.

In the third angular range of the saw arm is arranged before the interruption of the controlled processing at a positive first main intersection angle between 90 ° and 180 ° and the pivot axis has in the fourth parking position a distance to the second end point of maximum value of [B _b .1 + A _Mon days, D _2/2 + A _Monlage, B _b + .1 δ sin (90 °)] of -180 ° -a £ ₂ £ 0 °, maximum value of [B + A _b .1 _mounting, D _2/2 + A _Mo niage, B _b + .1 6 sin (90 °), D _2/2 + δ sin (a _2)] for 0 ° <a ₂ <90 ° and the maximum value of [B + A _b .1 _assembly, Ό ₂ / 2 + AM _Qn days> B .1 + 6 sin (90 °), D _2/2 + δ ^' sin (90 °)] for 90 ° <a ₂ <180 °.

After resuming the controlled machining, the wall saw is positioned in a resumption position corresponding to the fourth parking position. The saw arm is pivoted in the resume position in the second main cutting angle and the saw head is then moved in a direction opposite to the positive feed direction, negative feed direction in the direction of the first end point.

In the fourth embodiment, before the start of the controlled machining for the second saw blade, a second blade guard is set with a second blade guard width, the second blade guard width being from a first distance of the rotation axis to the first blade guard edge and a second distance of the rotation axis to the second blade guard edge. is sammengesetzt and the second distance for the calculation of the fifth parking position is additionally used. When working with the first and second blade guard, the fifth parking position depends on the first and second main cutting angles. In this case, three angular ranges are to be distinguished, negative main cutting angle, positive main cutting angle from 0 ° to 90 ° and positive main cutting angle of 90 ° to 180 °, so that there are a total of nine different distances for the fifth parking position.

In the first angular range of the saw arm is located before the interruption of the controlled processing at a negative first main intersection angle between -180 ° and 0 ° and the pivot axis has in the fifth parking position a distance to the second end point of maximum value of [B _b .1 + A _assembly , B .2 _b + A _M0 niage] to -180 ° s -ot ₂ £ 0 °, maximum value of [B + A _b .1 _Mon, _age, B _b _Mo .2 + A - _days, B .2 + sin δ (a ₂ )] for 0 ° <a. ₂ z 90 ° and maximum value of [B _b .1 + AMontage, B _b .2 + A _Monday e, B _b .2 + δ sin (90 °)] for 90 ° <a ₂ <180 °.

In the second angular range of the saw arm is arranged before the interruption of controlled machining at a positive first main intersection angle between 0 ° and 90 ° and the pivot axis has in the fifth parking position a distance to the second end point of maximum value of [B _b .1 + A _{mounting i} B _b .2 + AMontage, B _b .1 + δ sinia] for -180 ° s -a ₂ 0 °, maximum value of [B _b .1 + A _MO ntage, B _b .2 + A _Mounting , B _b .1 + δ sin ^), B _b .2 + δ sin (a ₂ )] for 0 ° <a ₂ £ 90 ° and maximum value of [B _b .1 + AMontage, B .2 + A _M ontag _e , B _b .1 + ö sin ^), B _b .2 + 8 sin (90 °)] for 90 ° <C 2- 180 °.

In the third angular range, the saw arm is disposed at a positive first main intersecting angle between 90 ° and 180 ° before the interruption of the controlled machining, and the pivot axis is at a distance from the second maximum maximum value of [B _b .1 + AMomage, B _b ] in the fifth parking position .2 + A ntage _Mo, B _b .1 + 8 sin (90 °)] of -180 ° £ ₂ £ -ct 0 °, maximum value of [B + A _b .1 _M ounting, B .2 + AMontage, B _b .1 + δ sin (90 °), B _b .2 + δ sin (a ₂ )] for 0 ° <a ₂ ^ 90 ° and maximum value of [B _b .1 + AMo _n _age , B _b .2 + A _M ontage, B _b .1 + δ sin (90 °), B _b .2 + δ sin (90 °)] for 90 ° <a ₂ 180 °.

After resuming the controlled machining, the wall saw is positioned in a resumption position corresponding to the fifth parking position. The saw arm is pivoted in the resume position in the second main cutting angle and the saw head is then moved in a direction opposite to the positive feed direction, negative feed direction in the direction of the first end point.

embodiments

Embodiments of the invention are described below with reference to the drawing. This is not necessarily to scale the embodiments, Rather, the drawing, where appropriate for explanation, executed in a schematic and / or slightly distorted form. With regard to additions to the teachings directly recognizable from the drawing reference is made to the relevant prior art. It should be noted that various modifications and changes may be made in the form and detail of an embodiment without departing from the general idea of the invention. The disclosed in the description, the drawings and the claims features of the invention may be essential both individually and in any combination for the development of the invention. In addition, 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 article that would be limited in comparison with the subject matter claimed in the claims. For given design ranges, values lying within the specified limits should also be disclosed as limit values and be arbitrarily usable and claimable. For simplicity, the same reference numerals are used below for identical or similar parts or parts with identical or similar function.

Show it:

FIG. 1 a wall saw system with a guide rail and a wall saw;

FIGS. 2A, B, the processing of a separation cut between a first and second free end point without obstacle;

FIGS. 3A, B, 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, the processing of a separating cut between a first and second

Obstacle with a saw blade surrounded by a blade guard;

FIGS. 5A-H show the wall sawing system of FIG. 1 when creating a separation cut between a first endpoint representing an obstacle and a second free endpoint with no obstruction; and

FIGS. 6A, B show the wall sawing system of FIG. 1 when creating another separation cut between a first free endpoint with no obstacle and a second endpoint, which is an obstacle. FIG. 1 shows a wall saw system 10 with a guide rail 11, a tool device 12 displaceably arranged on the guide rail 1 and a remote control unit 13. The tool device is designed as a wall saw 12 and comprises a machining unit 14 and a motorized feed unit 15. The machining unit is a saw head 14 formed and includes a trained as a saw blade machining tool 16 which is fixed to a saw arm 17 and is driven by a drive motor 18 about an axis of rotation 19.

To protect the operator, the saw blade 16 is surrounded by a blade guard 21 which is secured by means of a blade protection holder on the saw arm 17. The saw arm 17 is formed by a pivot motor 22 about a pivot axis 23 pivotally. The swivel 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 dips into a workpiece 24 to be machined. The drive motor 18 and the pivot motor 22 are arranged in a device housing 25. The motor-driven feed unit 15 comprises a guide carriage 26 and a feed motor 27, which is likewise arranged in the device housing 25 in the exemplary embodiment. The saw head 14 is mounted on the guide carriage 26 and formed on the feed motor 27 along the guide rail 11 in a feed direction 28 slidably. In the device housing 25, a control unit 29 for controlling the saw head 14 and the motor feed unit 15 is arranged in addition to the motors 19, 22, 27.

For monitoring the wall sawing system 10 and the machining process, a sensor device is provided with a plurality of sensor elements. A first sensor element 32 is designed as a swivel angle sensor and a second sensor element 33 as a displacement sensor. The swivel angle sensor 32 measures the current swivel 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. The measured variables are transmitted from the swivel angle sensor 32 and displacement sensor 33 to the control unit 29 and used to control the wall saw 12.

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 in the interior of 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 link. The first communication connection is designed as a wireless and wireless communication connection 41 or as a communication cable 42. The wireless and wireless communication connection is formed in the embodiment as a radio link 41, which is formed between a first radio unit 43 on the remote control 13 and a second radio unit 44 on the power tool 12. Alternatively, the wired and wireless loose communication connection 41 in the form of an infrared, Bluetooth, Wi-Fi or Wi-Fi connection be formed.

FIGS. 2A, B show the guide rail 1 1 and the wall saw 12 of the wall sawing system 10 of FIG. 1 when creating a separating cut 51 in the workpiece 24 of the workpiece thickness d. The separating cut 51 has an end depth T and extends in the feed direction 28 between a first end point Ε-1 and a second end point E ₂ . As the X direction, a direction parallel to the feed direction 28 is defined, wherein the positive X direction is directed from the first end point E, to the second end point E ₂ , and as the Y direction is a direction perpendicular to the X direction in the depth of the workpiece 24 defined.

The end point of a separation cut can be defined as a free end point without hindrance or as an obstacle. Both endpoints can be defined as free endpoints without obstacles, both endpoints as obstacles or one endpoint as a free endpoint and the other endpoint as an obstacle. At a free endpoint without obstacle, an overlap may be allowed. Due to the overlapping, the cutting depth at the end point reaches the final depth T of the separating cut. In the embodiment of FIGS. 2A, B form the end points E ,, E ₂ free end points without obstruction, wherein at the free first end point E, an overlapping is not allowed and at the second end point E _2, an overlapping is done.

FIG. 2A shows the saw head 14 in a mounting position X ₀ and the saw arm 17 in a basic position of 0 °. The saw head 14 is positioned by the operator by means of the guide carriage 26 in the mounting position X ₀ on the guide rail 1 1. The mounting position X _{0 of} the saw head 14 is between the first and second end point E ^ 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 the position monitoring of the saw head 14 and the control of 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, another X position on the saw head 14 can be set as the reference position, in which case the distance in the X direction to the pivot axis 23 must additionally be known.

The X-positions of the first and second end point E ^ E ₂ are defined in the embodiment by the entry of part lengths. The distance between the mounting position X ₀ and the first end point ET determines a first part length Li and the distance between the mounting position X ₀ and the second end point E ₂ a second part length L ₂ . Alternatively, the X positions of the end points E ^ E _{2 can be} defined by entering a partial length (Li or L ₂ ) and a total length L as the distance between the end points E ^ E ₂ . The separating cut 51 is created in several partial sections until the desired final depth T is reached. The partial sections between the first and second end points E ,, E ₂ are defined as main sections and the cutting sequence of the main sections as the main section sequence. At the end points of the separating cut, additional corner processing can be carried out, which in the case of an obstacle is referred to as obstacle processing and in the case of a free end point with overlapping as overcut processing.

The main cutting sequence can be specified by the operator or the control unit of the wall sawing system determines the main cutting sequence depending on several boundary conditions. Usually, the first main section, which is also referred to as a precut, is executed with a reduced depth of cut and a reduced power of the drive motor in order to prevent polishing of the saw blade. The other major sections are usually performed with the same depth of cut, but may also have different depths of cut. The boundary conditions usually defined by an operator include the depth of cut of the precut, the power of the precut, and the maximum depth of cut of the other major sections. From these constraints, the control unit can determine the main cutting sequence.

The main sections of a separating cut are made with a saw blade diameter or with two or more saw blade diameters. If multiple saw blades are used, machining usually 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 satisfied depends on two device-specific sizes of the wall sawing system 10, on the one hand by a vertical distance Δ between the pivot axis 23 of the saw arm 17 and a top 53 of the workpiece 24 and on the other by a saw arm length δ of the saw arm 17, which Distance between the axis of rotation 19 of the saw blade 16 and the pivot axis 23 of the saw arm 17 is defined. If the sum of these two device-specific sizes is greater than half the saw blade diameter D / 2, the saw blade 16 is arranged in the basic position above the workpiece 24. The saw arm length δ is a fixed device-specific size of the wall saw 12, whereas the vertical distance Δ between the pivot axis 23 and the surface 53 in addition to the geometry of the wall saw 12 also depends on the geometry of the guide rail 11 used.

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

To protect the operator, the saw blade 16 should be surrounded by the blade guard 21 during operation. The wall saw 12 is operated with blade guard 21 or without blade guard 21. For the processing of the separating cut in the region of the end points E ^ E ₂ , for example, a disassembly of the blade guard 21 may be provided. If different saw blade diameters are used to machine the cut, various blade protectors with appropriate blade guard widths are usually used.

FIG. FIG. 2B shows the saw arm 17 inclined in a negative rotational direction 54 at a negative pivot angle -a. The saw arm 17 is adjustable in the negative direction of rotation 54 between pivot angles of 0 ° to -180 ° and adjustable in a direction opposite to the negative direction of rotation 54, positive direction of rotation 55 between pivot angles of 0 ° to + 180 °. The in FIG. 2B arrangement of the saw arm 17 is referred to as a pulling arrangement when the saw head 14 is moved in a positive feed direction 56. If the saw head 14 is moved in a direction opposite to the positive feed direction 56, negative feed direction 57, the arrangement of the saw arm 17 is referred to as an abutting arrangement.

With a swivel angle of ± 180 °, the maximum penetration depth of the saw blade 16 into the workpiece 24 is achieved. By the pivoting movement of the saw arm 17 to the

Swivel axis 23, the position of the rotation axis 19 is moved in the X direction and in the Y direction. In this case, the displacement of the axis of rotation 19 of the Sägearmlänge δ and the pivot angle α of the saw arm 17 is dependent. The displacement δ _χ in the X direction is δ sin (± a) and the displacement path _{y y} in the Y direction is δ cos (± a).

The saw blade 16 generates in the workpiece 24 a cutting wedge in the form of a circle 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. For the penetration depth h, the relationship D / 2 = h + Δ + δ · cos (a), where D is the saw blade diameter, h is the penetration depth of the saw blade 16, Δ the vertical distance between the pivot axis 23 and the upper side 53 of the workpiece 24, δ the saw arm length and α denote the first pivot angle, and for the width b, the relationship b ² = D / 2 8h - 4h ² = 4Dh - 4h ² = 4h (D - h), where- at h the penetration depth of the saw blade 16 in the workpiece 24 and D denote the saw blade diameter.

The control of the wall saw 12 during the separating cut depends on whether the end points are defined as obstacles, and on an obstacle whether the processing is performed with blade guard 21 or without blade guard 21. In a free end point without hindrance, the control of the wall saw 12 in the process according to the invention via upper exit points of the saw blade 16 at the top 53 of the workpiece 24. The upper exit points of the saw blade 16 can be from the reference position X _He f the pivot axis 23 in the X direction , the displacement path δ "of the rotation axis 19 in the X direction and the width b calculate. An upper exit point facing the first end point ET is referred to as a first upper exit point 58 and an upper exit point facing the second end point E ₂ as a second upper exit point 59. For the first upper exit point 58, X (58) = XR _B I + δ _χ - b / 2 and for the second upper exit point 59, X (59) = X _Re i + δ "+ b / 2 with b = [h (D-h)] and h = h (a, D) ,

If the end points Ei, E ₂ are defined as obstacles, it is not possible to _drive over 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 Χ _Ηβ ι of the pivot axis 23 and the boundary of the wall saw 12. Here, a distinction between a processing without blade guard 21 and a processing with blade guard 21.

FIGS. 3A, B show the wall sawing system 10 in creating a separation cut between the first end point E, and the second end point E ₂ , which are defined as obstacles, wherein the processing is performed without blade guard 21. During processing without blade guard 21, a first saw blade edge 61, which faces the first end point Ei, and a second saw blade edge 62, which faces the second end point E ₂ , form the boundary of the wall saw 12.

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 _Re i of the pivot axis 23, the displacement path δ _{χ of} the rotation axis 19 and the saw blade diameter D. FIG. 3A shows the wall saw 12 with the saw arm tilted in the negative rotational direction 54 at a negative swivel angle -cc (0 ° to -180 °). For the first saw blade edge 61, X (61) = X _Re i + δ sin (-) a) - D / 2, and X (62) = X _{RE (} + δ sin (-a) + D / 2 for the second saw blade edge 62. FIG.3B shows the wall saw 12 with, in the positive direction of rotation 55, below positive swivel angle α (0 ° to + 180 °), inclined saw arm 17. For the first saw blade edge 61, X (61) = X _REF + δ sin (a) - D / 2 and for the second saw blade edge 62, X (62) = X _{RE (} + δ sin (a) + D / 2. FIGS. 4A, B show the wall saw system 10 in creating a separation cut between the first end point E, and the second end point E ₂ , which are defined as obstacles, wherein the processing with blade guard 21 is performed. When processing without blade guard 21 form a first blade protection edge 71, which faces the first end point Ε, and a second blade protection edge 72, which faces the second end point E ₂ , the boundary of the wall saw 12th

The X positions of the first and second blade protection edges 71, 72 in the X direction can be calculated from the reference position X _Re i of the pivot axis 23, the displacement path δ _{χ of} the rotation axis 19 and the blade guard width B. FIG. 4A shows the wall saw 12 with the saw arm 17 tilted at a negative swivel angle -a (0 ° to -180 °) and the blade guard 21 mounted blade guard 21. In an asymmetric blade guard, before the start of the controlled machining, the distances of the rotation axis become 19 determined to the blade protection edges 71, 72, wherein the distance to the first blade protection edge 71 as the first distance B _a and the distance to the second blade protection edge 72 as a second distance B _{b are} designated.

For the first blade protection edge 71, X (71) = X _Re i + δ sin (a) -B _a, and for the second blade protection edge 72, X (72) = X _Re i + δ ^' sin (a) + B _b . FIG. 4B shows the wall saw 12 with the saw arm 17 tilted at a positive pivot angle α (0 ° to + 180 °) and the blade guard 21 mounted. For the first blade guard edge 71, X (71) = Xp _e i + δ sin (a) _-Ba and for the second blade guard edge 72, X (72) = X _Re i + δ sin (a) + B _b .

FIGS. 2A, B show a separation section between two end points E ^ E ₂₎ which are defined as free end points without an obstacle, and FIG. 3A, B and 4A, B show a separation section between two end points Ε-ι, E ₂₎ which are defined as obstacles. In practice, also cuts are possible in which one endpoint is defined as an obstacle and the other endpoint represents a free endpoint without hindrance, the control of the wall saw at the free end point on the upper exit point of the saw blade and obstacle on the saw blade edge (processing without blade guard 21) or the blade guard edge (processing with blade guard 21).

The first upper exit point 58, the first saw blade edge 61 and the first blade guard edge 71 are grouped together under the term "first boundary" of the wall saw 12 and the second upper exit point 59, the second saw blade edge 62 and the second blade guard edge 72 are termed "second Limitation ".

FIGS. 5A-H show the wall saw system 10 of FIG. 1 with the guide rail 11 and the wall saw 12 when creating a separating cut of the final depth T in the workpiece 24 between a first endpoint Ε, which represents an obstacle, and a second endpoint E ₂ , which represents a free endpoint without an obstacle.

The processing of the separating cut is carried out with the aid of the method according to the invention for controlling a wall sawing system. The separating cut is made in a main cutting sequence of several main cuts until the desired final depth T is reached. The main cutting sequence comprises a preliminary cut (zeroth main section) with a zeroth main cutting angle oto of the saw arm 17, a zeroth diameter D ₀ and a zeroth penetration depth h _{0 of} the saw blade used, a first main section with a first main cutting angle od of the saw arm 17, a first diameter Ό and a first penetration depth of the saw blade used, a second main section having a second main cutting angle θ2 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 section having a third main cutting angle da of the saw arm 17, a third diameter D ₃ and a third penetration depth h _{3 of} the saw blade used.

The precut and the first main section are performed by a first saw blade 16.1 with a first saw blade diameter D.1 and a first blade guard 21.1 with a first blade guard width B.1. The zeroth diameter D _{0 of} the pre-cut and the first diameter Dt of the first main section coincide with the first saw blade diameter D.1, likewise the zeroth width B _{0 of} the pre-cut and the first width of the first main section coincide with the first blade guard width B.1. The second main section and the third main section are performed by a second saw blade 16.2 with a second saw blade diameter D.2 and a second blade guard 21.2 with a second blade guard width B.2. The second diameter D _{2 of} the second main section and the third diameter D _{3 of} the third main section coincide with the second saw blade diameter D.2, as are the second width B _{2 of} the second main section and the third width B _{3 of} the third main section with the second blade guard width B.2 match.

The main sections of a separating cut are advantageously carried out either with a pulling saw arm 17 arranged or the saw arm 17 is arranged alternately pulling and pushing. The pulling arrangement of the saw arm 17 allows a stable guidance of the saw blade during machining and a narrow kerf. A separating cut, in which the saw arm 17 is alternately pulled and pushed, has the advantage that the auxiliary times necessary for positioning the saw head 14 and pivoting the saw arm 17 are reduced. In the embodiment of FIGS. 5A-H, the processing takes place in all main sections with the pulling arm 17 arranged in a pulling manner. The processing of the separating cut begins at the second end point E ₂ . After starting the method according to the invention, the saw head 14 is positioned in a start position X _Slart , in which the pivot axis 23 has a distance of [h ₀ (D ₀ - h ₀ )] - δ sin (cto) to the second end point E ₂ , where h ₀ = h (oco, D ₀ ) = Do 2 - Δ - δ cos (o) denotes the depth of penetration of the saw blade into the workpiece 24 at the zeroth main cutting angle oo with the zeroth diameter D ₀ corresponding to the first saw blade diameter D.1 , In the starting position of the saw arm 17 is pivoted from the basic position 0 ° in the positive direction of rotation 55 in the positive zeroth main cutting angle a ₀ . Subsequently, the saw head 14 is moved with the inclined saw arm 17 and the rotating first saw blade 16.1 in the negative feed direction 57.

Since the first blade guard 21.1 is mounted, the control of the wall saw 12 takes place at the first end point Ei via the first blade protection edge 71 .1 of the first blade guard 21 .1. The saw head 14 is stopped when the pivot axis 23 has a distance of - δ sini-a,) to the first end point Ei. In this case, the first width Bi of the blade guard used corresponds to the first blade guard width B.1 of the first blade guard 21 .1. Subsequently, the saw arm 17 in the negative direction of rotation 54 in the negative first main section angle -a. pivoted and the saw head 14 with the below -a, inclined saw arm 17 in the positive feed direction 56 method (FIG 5A). In the exemplary embodiment, the transition from the precut to the first partial section without removing the residual material is done. Alternatively, the precut can be terminated with a complete removal of the residual material during the precut or a partial removal.

The saw head 14 is moved in the positive feed direction 56 until the pivot axis

23 has a distance of · (D ^ - h ^] + ö sini-ai) to the second end point E ₂ , where hi = h (-a _!, Di) = D, / 2 -Δ-δ cos (-ai) the penetration depth of the first saw blade 16.1 in the workpiece 24 at the negative first main cutting angle -0 ^ with the first diameter D, which corresponds to the first saw blade diameter D.1, respectively. Subsequently, the saw arm 17 is pivoted in the positive direction of rotation 55 into the positive first main cutting angle cd and the residual material is removed.

To change the saw blade from the first blade 16.1 to the second blade 16.2 of the saw head 14 is positioned in a parking position and the saw arm 17 from the workpiece

24 swung out, wherein the saw arm 17 is pivoted in the embodiment in the basic position of 0 ° (Figure 5B). In this case, the positioning of the saw head 14 in the parking position and the pivoting movement of the saw arm 17 can be carried out sequentially or performed simultaneously. The parking position is intended to fulfill various boundary conditions: The first saw blade 16.1 and the first blade guard 21.1 can be disassembled in the parking position. The second saw blade 16.2 and the second blade guard 21.2 can be mounted in the park position. In addition, the path for positioning the saw head 14 for the second main section should be as low as possible; Ideally, the parking position corresponds to the starting position for the second main section.

Since the second end point E _{2 represents} a free end point without hindrance, the disassembly of the first saw blade 16.1 and first blade guard 21.1 and the assembly of the second saw blade 16.2 and second blade guard 21.2 are easily possible. In the in FIG. Parking position shown 5B, the pivot axis 23 has a distance of ¹ i [h ₂ (D ₂ - h ₂ )] + δ sin (a ₂ ) to the second end point E ₂ , where h ₂ = h (a ₂ , D ₂ ) = D _2/2 - Δ - δ cos (a ₂ ) the penetration depth of the second saw blade 16.2 in the workpiece 24 at the positive second main cutting angle a ₂ with the second diameter D ₂ , which corresponds to the second saw blade diameter D.2, respectively.

After assembly of the second saw blade 16.2 and second blade guard 21.2 and the resumption of the controlled processing, the wall saw 12 is positioned by the control unit 29 in a resumption position corresponding to the parking position. The distance was set in the calculation of the parking position so that, the second end point E ₂ facing the second upper exit point 59.2 of the second saw blade 16.2 after the pivoting movement of the saw arm 17 in the positive second main section angle a ₂ coincides with the second end point E ₂ ( 5C). This positioning can reduce non-productive time.

In the resumption position of the saw arm 17 is pivoted in the positive direction of rotation 55 in the positive second main section angle a ₂ . The saw head 14 is moved with the, under the second main cutting angle a ₂ inclined, saw arm 17 and the rotating second saw blade 16.2 in the negative feed direction 57. The transition from the second main section to the third main section is analogous to the transition from the preliminary section to the first main section with a complete removal of the residual material (FIG. 5D) or alternatively with a partial removal of the residual material or without removal of the residual material. The wall saw is controlled by means of the first blade protection edge 71.2 of the second blade guard 21.2.

In practice, it is customary to perform the last major section with the maximum pivoting angle of the saw arm when cutting a workpiece in order to remove as much material as possible in the area of the end points. Without limitation of the maximum allowable Depth of cut corresponds to the maximum swing angle ± 180 ° and with restriction the permissible maximum cutting depth for the saw blade used can be converted into a maximum swing angle. In the exemplary embodiment, the third main section corresponds to the last main section and is performed with a third main section angle of -180 °.

The positioning of the saw head 14 for the third main section with the maximum pivot angle of -180 ° takes place by means of the critical angle from -90 °. The critical angle of -90 ° must be taken into account, since the first end point ET must not be exceeded during the swivel movement. The pivot axis 23 has at the critical angle a _k rit of -90 ° a distance of B.2 / 2-5 sin (-90 °) = B.2 / 2 + δ to the first end point E, on. Subsequently, the saw arm 17 is pivoted into the negative third main cutting angle of -180 ° (FIG. 5E).

Since the third main section represents the last main section of the main cutting sequence, a corner processing of the first end point E takes place before the machining of the last main section. For this purpose, the saw head 14 is moved in the negative feed direction 57 with the saw arm 17 (FIG. 6F) inclined below -180 °. until the first blade protection edge 71 .2 of the second blade guard 21.2 coincides with the first end point. The corner processing of the first end point Ei can be improved if the second blade guard 21.2 is dismantled and the corner processing takes place without blade protection. Without blade protection, the saw head 14 is moved with the saw arm 17 inclined below -180 ° 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 ET.

After the corner processing of the first end point E, the third main section is performed with the, under the negative third main cutting angle -a ₃ inclined saw arm 17 in the positive feed direction 56. The advancing movement of the saw head 14 is stopped when the pivot axis 23 is at a distance of V [h ₃ ^' (D ₃ -h ₃ )] + δ sin (180 °) = V [h ₃ (D ₃ -h ₃ )] to the second End point E ₂ , where h ₃ = h (-a ₃ , D ₃ ) = D3 2 - Δ - δ cos (-180 °) = D3 / 2 - Δ + δ the penetration depth of the saw blade into the workpiece 24 at the negative third Main cutting angle - <x ₃ with the third diameter D ₃ , which corresponds to the second saw blade diameter D.2, respectively. If the second end point E _2, an overcut is allowed, a corner machining of the second end point E is ₂ after the third main section (FIG. 5H).

In the in FIGN. 5A-H, the pivoting movement of the saw arm 17 is in a new main cutting angle in each case in a pivoting movement. In the case of hard materials or power-poorer drive motors 18 for the saw blade 16, it may be advantageous for the pivoting movement of the saw arm 17 to be performed in at least two steps with intermediate movement. to carry out between the pivoting movements in the intermediate angle respectively a free cutting of the saw blade 16.

FIGS. 6A, B show the wall saw system 10 with the guide rail 1 1 and the wall saw 12 in creating another separation cut between a first end point E, representing a free end point without obstacle, and a second end point E ₂ , which is an obstacle. The control of the wall saw 12 takes place at the first end point ET via the first upper exit point 59 of the saw blade used and at the second end point E ₂ over the first saw blade edge 61 (without blade guard 21) or the first blade guard edge 71 (with blade guard 21).

The cutting sequence comprises a first main section having a first main cutting angle 0Ci of the saw arm 17, a first diameter 0 and a first penetration depth h _{1 of} the saw blade used and a following second main section having a second main cutting angle Oz of the saw arm 17, a second diameter D ₂ and a second Penetration depth h _{2 of} the saw blade used.

The first main section is performed by the first saw blade 16.1 and the first blade guard 21 .1, and the second main section is performed by the second saw blade 16.2 and the second blade guard 21 .2. The first diameter D, and the first width Bi of the first main section coincide with the first saw blade diameter D.1 and the first blade guard width B.1. The second diameter D ₂ and the second width B _{2 of} the second main section coincide with the second saw blade diameter D.2 and the second blade guard width B.2.

The boundary conditions apply to the parking position:

^■ removing the first blade 16.1 and the first blade guard 21/1,

^■ Mounting the second saw blade 16.2 and second blade guard 21.2

Swiveling the saw arm 17 with the first saw blade 16.1 from the first main cutting angle (i to the basic position at 0 ° and

^■ pivoting of the saw arm 17 with the second saw blade 16.2 from the basic position at 0 ° in the second main cutting angle a _2.

The dismantling of the first saw blade 16.1 and the first blade guard 21.1 and the mounting of the second saw blade 16.2 and second blade guard 21 .2 take place in the basic position of the saw arm 17 at 0 °. If the second end point E ₂ , as in the exemplary embodiment represents an obstacle, before the start of the controlled processing additionally a mounting distance / ^ assembly is set. The mounting distance A _Mon ntage ensures that between the There is sufficient clearance between the obstacle and the saw blade or between the obstacle and the blade guard for the operator to grip the saw blade or the blade guard; as mounting distance, for example, 10 cm are suitable.

In a machining blade guard, a minimum distance for the second end point (E ₂₎ of B _b .1 + Ä _Mo is basically _b .2 + Ä _M0 ntage ntage required for the first sheet protection 21.1 and B for the second blade guard 21.2. Since the first blade guard width B.1 is smaller than the second blade guard width B.2, it is sufficient for symmetrical blade protectors to consider the second blade guard width B.2 when calculating the minimum clearance for mounting, with asymmetrical blade protectors both minimum clearances must be taken into account. The pivot axis 23 has a distance of maximum value of [B _b + A _o .1 .2 ntagei B _b + ÄMontage] to the obstacle at E ₂ (FIG. 6A).

The necessary distances for pivoting the first saw blade 16.1 and for pivoting the second saw blade 16.2 at the second end point E ₂ depend on the first main section angle ai of the first main section and the second main section angle a _{2 of} the second main section. It is to be distinguished between negative main cutting angles of -180 ° to 0 °, positive main cutting angle α from 0 ° to 90 ° and positive main section angle α from 90 ° to 180 °. For positive main cutting angles α of 90 ° to 180 °, the critical angle a _kn t of ± 90 ° must be taken into account, since the obstacle at the second end point E ₂ must not be exceeded during the pivoting movement. The pivot axis 23 has at the critical angle a _kfj of + 90 ° a distance to the second end point E ₂ of B _b .1 + δ sin (90 °) = B _b .1 + δ for the first blade guard 21.1 and B _b . 2 + δ sin (90 °) = B _b .2 + δ for the second blade guard 21.2 (FIG. 6B).

With negative first main cutting angles -o ^ from -180 ° to 0 °, the swiveling out of the first saw blade 16.1 into the basic position at 0 ° takes place on the side facing away from the second end point E ₂ , and the displacement is negative. For negative second main cutting angles -a ₂ , positive second main cutting angles a ₂ from 0 ° to 90 ° and positive second main cutting angles a ₂ from 90 ° to 180 °, different distances result.

With negative second main cutting angles -a ₂ , the swiveling in of the second saw blade 16. ₂ takes place on the side facing away from the second end point E ₂ and the distance required for swiveling in is smaller than the minimum distance for mounting; the control unit 29 selects as the parking position for the wall saw 12, the maximum value of [B _b .1 + ÄMontage, B _b .2 + Ä _Monta g _e ]. For positive second main cutting angles a ₂ between 0 ° and 90 ° for pivoting the second saw blade 16.2 a distance of the pivot axis 23 to the obstacle at E ₂ of B _b .2 + δ sin (ot ₂ ) required and the control unit 29 selects as parking position for the wall saw 12 the maximum value of [B _b .1 + A _mounting , B _b .2 + A _O ntage, B _b .2 + δ sin (a ₂ )] for 0 ° < ₂ -. 90 °. With a positive second main cutting angle ₂ between 90 ° and 180 °, the distance of the pivot axis 23 to the obstacle B necessary for pivoting in the second saw blade 16 is _b .2 + δ sin (90 °) = B .2 + δ and the control unit 29 selects as parking position for the wall saw 12 the maximum value of [B _b .1 + AMontage. B _b .2 + AMontage. B _b .2 + δ ^' sin (90 °)] for 90 ° <a ₂ <180 °.

With positive first main cutting angle α-ι from 0 ° to 90 °, the swinging out of the first saw blade 16.1 in the basic position on the, the second end point E ₂ , facing side. For pivoting the first saw blade 16.1, a distance of the pivot axis 23 of B _b .1 + δ sin (cti) to the obstacle is required. For negative second main _{cutting angles} - a _2l positive second main _{cutting angles} oc ₂ from 0 ° to 90 ° and positive second main _{cutting angles} a ₂ from 90 ° to 180 ° result in different distances.

In the case of negative second main cutting angles a ₂ , the second saw blade 16.2 pivots in on the opposite side of the obstacle and the control unit 29 selects the maximum value of [B _b .1 + A _m ontage, B. B .1 _b + δ sin (ai)]. For positive second main cutting angles ₂ from 0 ° to 90 ° for pivoting the second saw blade 16.2, a distance of the pivot axis 23 of B _B .2 + δ sin ( ₂ ) to the obstacle required and the control unit 29 selects as parking position for the wall saw 12, the maximum value from [B .1 + A _M ontage. B _b _Mo .2 + A ntage. B .1 _b + δ sinia,), B _b .2 + ö sin (a _2)]. For positive second main cutting angles a ₂ from 90 ° to 180 ° for pivoting the second saw blade 16.2 a distance of the pivot axis 23 of B _b .2 + δ sin (90 °) = B _B .2 + δ to the obstacle required and the control unit 29th selects as the parking position for the wall saw 12 the maximum value of [B _b .1 + A _M0 ntage, B _b .2 + Awontage, B _b .2 + δ sin (90 °)].

With positive first main cutting angle of 90 ° to 180 °, the swiveling out of the first saw blade 16.1 into the basic position takes place on the side facing the second end point E ₂ ; for pivoting the first saw blade 16.1 is a distance of the pivot axis 23 of B _b .1 + δ sin (90 °) = B _b .1 + δ to the obstacle at E ₂ required. For negative second main cutting angles -a ₂ , positive second main cutting angles a ₂ from 0 ° to 90 ° and positive second main cutting angles a ₂ from 90 ° to 180 °, different distances result.

With negative second main cutting angles a ₂ , the pivoting of the second saw blade 16.2 on the side facing away from the obstacle and the control unit 29 selects as parking position for the wall saw 12, the maximum value of [B _b .1 + A _Mon ntage, B _b .2 + A _M onta _g e. B _b .1 + 5 'sin (90 °)]. With positive second main cutting angles ₂ from 0 ° to 90 °, ken of the second saw blade 16.2 a distance of the pivot axis 23 of B _b .2 + δ sin (a ₂ ) to the obstacle required and the control unit 29 selects as parking position for the wall saw 12, the maximum value of [B _b .1 + A _assembly , B _b .2 + Δ _Μοπ , _39β , B _b .1 + 5 sin (90 °), B _b .2 + δ sin (a ₂ )]. For positive second main cutting angles a ₂ from 90 ° to 180 °, a distance of the pivot axis 23 from B _b .2 + δ sin (90 °) = B _b .2 + δ to the obstacle is required for swiveling in the second saw blade 16 Control unit 29 selects as the parking position for the wall saw 12, the maximum value of [B _b .1 + A _Mon , _age , B _b .2 + A _Mon , _age , B _b .1 + δ sin (90 °), B _b .2 + δ sin (90 °)].

If the machining of the first and / or second partial section is performed without blade protection, the second saw blade edge 62 is used instead of the second blade guard edge 72 for calculating the minimum distances for the parking position and the second blade guard width B.2 is the saw blade diameter D.2 of the second Saw blade 16.2 replaced.

In the in FIGN. 5A-H and FIG. 6A, B, the pivotal movement of the saw arm 17 in the main cutting angle in each case takes place in a pivoting movement. For hard materials or power-poorer drive motors 18 for the saw blade, it may be advantageous to perform the pivoting movement of the saw arm 17 in at least two steps with intermediate angle, wherein between the pivoting movements in the intermediate angle in each case a free cutting of the saw blade.

Claims

claims

Method for controlling a wall sawing system (10) comprising a guide rail (1 1) and a wall saw (12) with a saw head (14), a motorized feed unit (15) which moves the saw head (14) parallel to a feed direction (28) along the guide rail (1 1), a first saw blade (16.1) and a larger, second saw blade (16.2) when creating a separating cut (51) of the final depth (T) in a workpiece (24) of the workpiece thickness (d) between a first End point (E ^ and a second end point (E ₂ ), wherein the first or second saw blade (16) on a, about a pivot axis (23) pivotable, saw arm (17) of the saw head (14) attached and about an axis of rotation (19) is driven, with:

^■ before starting a processing of the separating cut (51) controlled by a control unit (29) of the wall saw (12), at least the first saw blade diameter (D.1) of the first saw blade (16.1), the second saw blade diameter (D.2) of the second Saw blade (16.2), the positions of the first and second end point (ET, E ₂ ) in the feed direction (28), the final depth (T) of the separating cut (51) and a main cutting sequence of m main sections, m> 2 determines, the main cutting sequence at least a first main section having a first main section angle (αι) of the saw arm (17) and a first diameter (Di) of the saw blade used in the first main section and a following second main section with a second main section angle (a ₂ ) of the saw arm (17) and a second diameter (D ₂ ) of the saw blade used in the second main section,

^■ during the processing controlled by the control unit (29)

- The saw arm (17) with the first saw blade (16.1) in a positive direction of rotation (55) under the positive first main cutting angle {+ a.,) or in one to the positive direction of rotation (55) opposite, negative rotational direction (54) below the negative first main section angle (-α,) and arranged

- the saw head (14) in a positive feed direction (56) in the direction of the second end point (E ₂ ) method, characterized in that after the processing of the separating cut (51) with the first saw blade (16.1), the controlled processing of the separating cut of the Control unit (29) is interrupted and the wall saw (12) by the control unit (29) is moved to a parking position.

2. The method according to claim 1, characterized in that the wall saw (12) after the change from the first saw blade (16.1) to the second saw blade (16.2) and the Wieder- recording of the controlled processing by the control unit (29) is positioned in a resumption position.

3. The method according to any one of claims 1 to 2, characterized in that prior to the start of the control unit (29) controlled machining in addition a Sägearmlänge (δ) of the saw arm (17), as the distance between the pivot axis (23) of the saw arm (17) and the axis of rotation (19) of the saw blade (16) is defined, and a distance (Δ) between the pivot axis (23) and a top surface (53) of the workpiece (24) are fixed.

4. The method according to claim 3, characterized in that the second end point (E ₂ ) represents a free end point without obstruction and set before the start of the second saw blade diameter (D.2) of the second saw blade (16.2) for the calculation of a first parking position and a resumption position corresponding to the first parking position is used.

5. The method according to claim 4, characterized in that the pivot axis (23) in the first parking position a distance from the second end point (E ₂ ) of V [h ₂ (D.2 - h ₂ )] + 5 sin (± a ₂ ), wherein h ₂ = h (± a ₂ , D.2) = D.2 / 2 - Δ - 5 cos (± a ₂ ) the penetration depth of the second saw blade (16.2) used in the workpiece (24) in the second Main cutting angle (± ot ₂ ) with the preset second saw blade diameter (D.2).

6. The method according to claim 3, characterized in that the second end point (E ₂ ) represents a free end point without obstruction and the second saw blade diameter of the second saw blade (16.2) between a maximum second saw blade diameter (Dmax.2) and a minimum second saw blade diameter (16). D _min .2) is adjustable, wherein the maximum second saw blade diameter (D _max .2) is used for the calculation of a second parking position.

7. The method according to claim 6, characterized in that the pivot axis (23) in the second parking position a distance to the second end point (E ₂ ) of [h _{2, max} (D _max .2 - h ₂ , max)] + 8 sin (± a ₂ ), where h ₂ , _max = h (± ot ₂ , D _max. ₂ ) = D _max .2 / 2 - Δ - δ cos (± a ₂ ) is the maximum penetration depth of the second saw blade (16.2) in the workpiece (24) at the second main cutting angle (± a ₂ ) with the maximum second saw blade diameter (D _max .2).

8. The method according to claim 7, characterized in that the wall saw (12) is positioned after the resumption of the controlled processing in a resumption position, which corresponds to the second parking position.

9. The method according to claim 7, characterized in that before the resumption of the controlled processing, the actual second saw blade diameter (D _rea i.2) of the second saw blade (16.2) is input and used for the calculation of a resumption position.

10. The method according to claim 9, characterized in that the pivot axis (23) in the resume position a distance to the second end point (E ₂ ) of [h ₂ (D _re . Ai.2 / 2 - h ₂ )] + 5 sin ( ± a ₂ ), where h ₂ = h (± a ₂ , D _rea i.2) = D _rea i.2 / 2 - Δ - δ cos (± a ₂ ) the penetration depth of the second saw blade (16.2) into the Workpiece (24) at the second main cutting angle (± a ₂ ) with the actual second saw blade diameter (D _rea | .2).

1 1. A method according to claim 3, characterized in that the second end point (E ₂ ) is defined as an obstacle and before the start of the controlled processing additionally an assembly distance (ÄMomage) is set, wherein the mounting _distance (A _MDn , _agB ) for the calculation of a third to fifth parking position is additionally used.

12. The method of claim 1 1, characterized in that the saw arm (17) before the interruption of the controlled processing at a negative first main section angle (-α between -180 ° and 0 ° is arranged and the pivot axis (23) in the third parking position a distance to the second end point (E ₂ ) of maximum value of [Di / 2 + AMontage. D _2/2 + A _M ont _ag e] for -180 ° £ -a ₂ <0 °, maximum value of + A _Mo nt _a ge . D _2/2 + _δ Μοη., _age, D _2/2 + δ ^'sin (a _2)] for 0 ° <a ₂ ntage £ 90 ° and a maximum value of [Di / 2 + A _M0, D _2/2 + A _MO nt _a - g _e , D _2/2 + δ sin (90 °)] for 90 ° <a ₂ <180 °.

13. The method according to claim 11, characterized in that the saw arm (17) is arranged before the interruption of the controlled processing at a positive first main cutting angle (+ oti) between 0 ° and 90 ° and the pivot axis (23) in the third parking position a Distance to second end point (E ₂ ) of maximum value of [D, / 2 + ÄMomage. D _2/2 + A _Mon, _a g _e, 0 ^ 2 + δ sin ^)] to -180 ° s -a ₂ £ 0 °, maximum value of [0 ^ 2 + A _M ounting. D2 2 + A _Mon days. D 2 + 5 sin ^), D _2/2 + δ · sin (cx ₂ )] for 0 ° <cx ₂ -5 90 ° and maximum value of [D, / 2 + A _M ont _a ge, 0 ^ 2 + A _mounting , D _2/2 + δ sin (90 °)] for 90 ° <a ₂ <180 °.

14. The method of claim 1 1, characterized in that the saw arm (17) before the interruption of the controlled processing under a positive first main section Angle (+ 0 ^) between 90 ° and 180 ° is arranged and the pivot axis (23) in the third parking position a distance from the second end point (E ₂ ) of maximum value of

[D, / 2 + ÄMontage. D _2/2 + _Δ Μοπ, _Β96, D, / 2 + δ ^'sin (90 °)] of -180 ° <, - ₂ <0 ° and the maximum value of + A _o ntage, D _2/2 + A _Mon i _age , D _2/2 + δ sin (90 °)] for 90 ° <a ₂ 180 °.

15. The method according to any one of claims 12 to 14, characterized in that for calculating the third parking position for the first diameter (Di) of the first main section of the preset first saw blade diameter (D.1) of the first saw blade (16.1) and for the second diameter (D ₂ ) of the second main section of the preset second saw blade diameter (D.2) of the second saw blade (16.2) is used.

16. The method according to claim 15, characterized in that the wall saw (12) after the resumption of the controlled processing of the control unit (29) is positioned in a resumption position corresponding to the third parking position.

17. The method according to any one of claims 12 to 14, characterized in that the second saw blade diameter between a maximum second saw blade diameter (Dmax.2) and a minimum second saw blade diameter (D _min .2) is adjustable and in the calculation of the third parking position for the second diameter (D ₂ ) of the second main section of the maximum second saw blade diameter (D _max .2) is used.

18. The method according to claim 17, characterized in that the wall saw (12) is positioned after the resumption of the controlled processing of the control unit (29) in a resumption position, which corresponds to the third parking position.

19. The method according to claim 17, characterized in that before the resumption of the controlled processing, the actual second saw blade diameter (D _rea i.2) of the second saw blade (16.2) is input and used for the calculation of a resumption position.

20. The method according to claim 9, characterized in that the pivot axis (23) in the resume position a distance from the second end point (E ₂ ) of D _rea i.2 / 2 for - 180 ° <-a ₂ <0 °, D _rea , .2 / 2 + δ ^■ sin (a ₂ ) for 0 ° <a ₂ -5 90 ° and D _real .2 / 2 + δ ^■ sin (90 °) for 90 ° <a ₂ .5 180 °.

21. The method according to claim 11, characterized in that before the start of the controlled processing for the first saw blade (16.1) a first blade guard (21.1) with a first blade guard width (B.1) is set, wherein the first blade guard width (B.1 ) from a first distance (B _a .1) of the rotation axis (19) to the first blade protection edge (71.1) and a second distance (B _b .1) of the rotation axis (19) to the second blade protection edge (72.1) is composed and the second distance (B _b .1) is additionally used for the calculation of a fourth parking position.

22. The method according to claim 21, characterized in that the saw arm (17) before the interruption of the controlled processing at a negative first main cutting angle (-α,) between -180 ° and 0 ° is arranged and the pivot axis (23) in the fourth Parking position a distance to the second end point (E ₂ ) of maximum value of [B _b .1 + AMontage, D _2/2 + A _mounting ] for -180 ° <, -a ₂ 2 0 °, maximum value of [B _b .1 + AMontage, D _2/2 + A _Monla. g _e . D2 2 + δ ^'sin (a _2)] for 0 ° <a s 90 ° ₂ and maximum value of [B + _b .1 AMontage, D _2/2 + AMontage,

D _2/2 + δ · sin (90 °)] for 90 ° <a ₂ <, 180 °.

23. The method according to claim 21, characterized in that the saw arm (17) is arranged before the interruption of the controlled machining at a positive first main cutting angle (+ 0 ^) between 0 ° and 90 ° and the pivot axis (23) in the fourth parking position a distance to the second end point (E ₂ ) of maximum value of [B _b .1 + AMontage. D _2/2 + A _M ontage. B _b ounting .1 + δ sin ^)] to -180 ° £ ₂ -a 0 °, maximum value of [B + _b .1 AMontage, D _2/2 + A _M, B _b + .1 δ sin ^), D _2/2 + δ sin (a _2)] for 0 ° <α ₂ £ 90 ° and maximum value of [B + A .1 _M ounting, D _2/2 + A _M0 niage, B _b .1 + δ ^ si a,), D _2/2 + δ sin (90 °)] for 90 ° <a _2> 180 °.

24. The method according to claim 21, characterized in that the saw arm (17) before the interruption of the controlled processing at a positive first main cutting angle (+ <* _! ) Between 90 ° and 180 ° is arranged and the pivot axis (23) in the fourth parking position spaced from the second end point (e ₂₎ from maximum value of [B + a _b .1 _Mo ntage, D _2/2 + a ntage _Mo, B _b + .1 δ sin (90 °)] of -180 ° £ - a ₂ s + A .1 _M ounting 0 °, maximum value of [B, D _2/2 + A ntage _Mo, B _b .1 + δ · sin (90 °), D _2/2 + δ sin (a ₂₎ ] for 0 ° <a ₂ <90 ° and the maximum value of [B + A _b .1 _Mo Ntag _e, D _2/2 + A ntage _Mo, B _b + .1 δ sin (90 °), D _2/2 + δ sin (90 °)] for 90 ° <a ₂ s 180 °.

25. The method according to claim 21, characterized in that before the start of the controlled processing for the second saw blade (16.2) a second blade guard (21.2) with a second blade guard width (B.2) is set, wherein the second blade guard width (B.2 ) is composed of a first distance (B _a .2) of the rotation axis (19) to the first blade protection edge (71.2) and a second distance (B _b .2) of the rotation axis (19) to the second blade protection edge (72.2) and the second distance ( B .2) is additionally used for the calculation of the fifth parking position.

26. The method according to claim 25, characterized in that the saw arm (17) before the interruption of the controlled processing at a negative first main cutting angle (-αι) between -180 ° and 0 ° is arranged and the pivot axis (23) in the fifth parking position a distance to the second end point (E ₂ ) of maximum value of [B _b .1 + A _M ontage, B _b .2 + A _mounting ] for -180 ° £ -a ₂ s 0 °, maximum value of [B _b .1 + A _Mon t _a g., B _b. 2 + A _Monta . g _e, B _b .2 + 5 sin (a _2)] for 0 ° <a ₂ <90 ° and the maximum value of [B + A _b .1 _M _ntag _B, B + A _b .2 ntage _Mo, B _b. 2 + δ sin (90 °)] for 90 ° < ₂ <180 °.

27. The method according to claim 25, characterized in that the saw arm (17) is arranged before the interruption of the controlled processing at a positive first main cutting angle (+ a,) between 0 ° and 90 ° and the pivot axis (23) in the fifth parking position a distance to the second end point (E ₂ ) of maximum value of [B _b .1 + AMontage. B _b .2 + A _M0 niage, B _b .1 + δ sin ^)] for -180 ° - ₂ -S 0 °, maximum value of [B _b .1 + AMontage, B _b .2 + A _MO ntage. B _b .1 + δ sin (a,), B _b .2 + δ sin (a ₂ )] for 0 ° <a ₂ £ 90 ° and the maximum value of [B _b .1 + A _Monlage , B _b .2 + A _mo niage. B _b .1 + δ sin a,), B _b .2 + δ sin (90 °)] for 90 ° <a ₂ <180 °.

28. The method according to claim 25, characterized in that the saw arm (17) before the interruption of the controlled machining at a positive first main cutting angle (+ ci) is arranged between 90 ° and 180 ° and the pivot axis (23) in the fifth parking position a distance from the second end point (e ₂₎ of maximum value of [B + A _b .1 _Mo nia _gei B _b + A ounting .2, .1 B _b + δ sin (90 °)] of -180 ° -CX ₂ -. 0 °, maximum value of [B + _b .1 AMontage, B _b + A .2 _M ounting, B _b + .1 δ ^■ sin (90 °), B _b .2 + δ · sin (a _2)] for 0 ° <a ₂ <90 ° and maximum value of [B _b .1 + A _Monlage , B .2 + AMontage, B _b .1 + δ sin (90 °), B _b .2 + δ sin (90 °)] for 90 ° < ₂ <180 °.