EP2993010A1 - Method for controlling a wall saw system when creating a separating cut - Google Patents

Abstract

A method of controlling a wall sawing system (10) to create a severing cut in a workpiece (24) between a first and second endpoint. The wall saw system (10) comprises a wall saw (12) with a saw head (14), a pivotable saw arm (17), a first saw blade and a larger, second saw blade. The separating cut is carried out in several main sections, whereby the parameters of the main cuts (saw blade diameter of the inserted saw blade, main cutting angle) are determined before the start in a main cutting sequence. After the processing of the separating cut is completed with the first saw blade, the controlled processing of the separating cut is interrupted by a control unit and moves the wall saw (12) from the control unit in a parking position. The parking position is selected so that all actions can be performed when changing the saw blade (swiveling the saw arm, disassembling the first saw blade, mounting the second saw blade and swiveling in the saw arm).

Description

Technical area

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

Out EP 1 693 173 B1 For example, a method for controlling a wall sawing system when creating a parting cut in a workpiece between a first endpoint and a second endpoint is known. 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.

• ▪ Demontieren des ersten Sägeblattes und ersten Blattschutzes,
• ▪ Montieren des zweiten Sägeblattes und zweiten Blattschutzes,
• ▪ Ausschwenken des Sägearms mit dem ersten Sägeblatt aus dem ersten Hauptschnittwinkel in die Grundposition und
• ▪ Einschwenken des Sägearms mit dem zweiten Sägeblatt aus der Grundposition in den zweiten Hauptschnittwinkel.

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
• ▪ Swiveling 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 √ [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 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 √ [h _{2, max} * (D _max .2-h _{2, max} )] + δ · sin (± α ₂ ), where h _{2, max} = h _max (± α ₂ , D _{max. 2} ) = D _max .2 / 2 - Δ - δ · cos (± α 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 resume position, the pivot axis is at a distance from the second end point of √ [h ₂ * (D _real .2-h ₂ )] + δ * sin (± α ₂ ), where h ₂ = h (± α ₂ , D _real .2) = D _real. 2/2 - Δ - δ · cos (± α 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 of the saw arm is arranged in front of the interruption of the controlled processing at a negative first main cutting angle between -180 ° and 0 ° and the pivot axis is in the third parking position spaced from the second end point by maximum value of [D _1/2 + Δ _assembly, D _2/2 + δ _assembly] is -180 ° ≤ -α ₂ ≤ 0 °, maximum value of [D _1/2 + δ _mounting, D _2/2 + δ _mounting, D _2/2 + δ · sin (α ₂ )] for 0 ° <α ₂ ≤ 90 ° and maximum value of [D _1/2 + Δ _mounting, D _2/2 + Δ _mounting, D _2/2 + δ · sin (90 °)] for 90 ° <α ₂ ≤ 180 °. For all the negative first main intersection angle of displacement is δ * sin (-α ₁₎ negative and therefore basically applies D _1/2 + δ · sin (-α ₁₎ <D _1/2 + Δ _assembly. If the second diameter _D2 is greater than the first diameter D _1, D always applies _1/2 + Δ _assembly <D _2/2 + Δ _assembly.

In the second angular range of the saw arm is arranged before the interruption of controlled machining under a positive first main cutting angle between 0 ° and 90 ° and the pivot axis is in the third parking position spaced from the second end point by maximum value of [D _1/2 + Δ _mounting, D _2/2 + Δ _mounting, D _1/2 + δ · sin (α _1)] to -180 ° ≤ -α ₂ ≤ 0 °, Maximum value of [D _1/2 + Δ _mounting, D _2/2 + Δ _mounting, D _1/2 + δ · sin (α _1), D _2/2 + δ · sin (α _2)] α for 0 ° < ₂ ≤ 90 ° and maximum value of [D _1/2 + Δ _mounting, D _2/2 + Δ _mounting, D _2/2 + δ · sin (90 °)] for 90 ° <α ₂ ≤ 180 °. For all the negative second main cutting angle of displacement is δ * sin (-α ₂₎ is negative and therefore basically applies D _2/2 + δ · sin (-α ₂₎ <D _2/2 + Δ _assembly.

In the third angular range of the saw arm is arranged before the interruption of controlled machining under a positive first main cutting angle between 90 ° and 180 ° and the pivot axis is in the third parking position spaced from the second end point by maximum value of [D _1/2 + Δ _mounting, D _2/2 + δ _mounting, D _1/2 + δ · sin (90 °)] is -180 ° ≤ -α ₂ ≤ 0 ° and maximum value of [D _1/2 + δ _mounting, D _2/2 + δ _assembly , D _2/2 + δ · sin (90 °)] for 90 ° <α ₂ ≤ 180 °.

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 _real .2 / 2 for -180 ° ≤ -α ₂ ≤ 0 °, D _real .2 / 2 + δ · sin (α ₂ ) for 0 ° <α ₂ ≤ 90 ° and D _real .2 / 2 + δ · sin (90 °) for 90 ° <α ₂ ≤ 180 °.

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 three angular ranges of -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 fourth parking position.

In the first angular range, before the interruption of the controlled machining, the saw arm is disposed at a negative first main cutting angle between -180 ° and 0, and the pivot axis is at a distance from the second end point of maximum value of [B _b .1 + Δ _mounting , D _2/2 + Δ _assembly] is -180 ° ≤ -α ₂ ≤ 0 °, maximum value of [B + Δ _b .1 _mounting, D _2/2 + Δ _mounting, D _2/2 + δ · sin (α ₂₎ ] for 0 ° <α ₂ ≤ 90 ° and maximum value of [B _b .1 + δ _mounting, D _2/2 + δ _mounting, D _2/2 + δ · sin (90 °)] for 90 ° <α ₂ ≤ 180 ° up.

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 + Δ _assembly , D _2/2 + Δ _mounting, B _b .1 + δ · sin (α _1)] -α for -180 ° ≤ ₂ ≤ 0 °, maximum value of [B + Δ _b .1 _mounting, D _2/2 + Δ _assembly , B _{b 1} + δ · sin (α ₁ ), D _2/2 + δ · sin (α ₂ )] for 0 ° <α ₂ ≤ 90 ° and maximum value of [B _b .1 + Δ _assembly , D ₂ / 2 + Δ _mounting , B _b .1 + δ · sin (α ₁ ), D _2/2 + δ · sin (90 °)] for 90 ° <α 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 swivel axis is at a distance from the second maximum maximum value of [B _b .1 + Δ _mounting , D _2/2 + Δ _mounting, B _b .1 + δ · sin (90 °)] is -180 ° ≤ -α ₂ ≤ 0 °, maximum value of [B + Δ _b .1 _mounting, D _2/2 + Δ _assembly , B _b .1 + δ · sin (90 °), D _2/2 + δ · sin (α _2)] α for 0 ° _<2 ≤ 90 ° and maximum value of [B + Δ _b .1 _mounting, D ₂ / 2 + Δ _mounting , B _b .1 + δ · sin (90 °), D _2/2 + δ · sin (90 °)] for 90 ° <α 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 controlled machining for the second saw blade, a second blade guard having a second blade guard width is defined, the second blade guard width 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 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 cutting 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 + Δ _assembly , B _b .2 + Δ _mounting ] for -180 ° ≤ -α ₂ ≤ 0 °, maximum value of [B _b .1 + Δ _mounting , B _b .2 + Δ _mounting , B _b .2 + δ · sin (α ₂ ) for 0 ° <α ₂ ≤ 90 ° and maximum value of [B _b .1 + Δ _mounting , B _b .2 + Δ _mounting , B _b .2 + δ · sin (90 °)] for 90 ° <α ₂ ≤ 180 °.

In the second angular range, the saw arm is disposed at a positive first principal intersecting angle between 0 ° and 90 ° 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 + Δ _mounting , B _b .2 + Δ _mounting , B _b .1 + δ · sin (α ₁ )] for -180 ° ≤ -α ₂ ≤ 0 °, maximum value of [B _b .1 Δ _mounting , B _b .2 + Δ _mounting , B .1 _b + δ · sin (α _1), B _b .2 + δ · sin (α _2)] for 0 ° <α ₂ ≤ 90 ° and maximum value of [B + δ _b .1 _mounting, B _b. 2 + Δ _mounting , B _b .1 + δ · sin (α ₁ ), B _b .2 + δ · sin (90 °)] for 90 ° <α 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 + Δ _mounting , B _b .2 + Δ _mounting , B _b .1 + δ · sin (90 °)] for -180 ° ≤ -α ₂ ≤ 0 °, maximum value of [B _b .1 + Δ _mounting , B _b .2 + Δ _mounting , B _b .1 + δ · sin (90 °), B _b .2 + δ · sin (α ₂ )] for 0 ° <α ₂ ≤ 90 ° and maximum value of [B _b .1 + Δ _assembly , B _b .2 + δ _mounting, B _b .1 + δ · sin (90 °), B _b .2 + δ · sin (90 °)] for 90 ° <α 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.

FIG. 1

ein Wandsägesystem mit einer Führungsschiene und einer Wandsäge;

FIGN. 2A, B

die Bearbeitung eines Trennschnittes zwischen einem ersten und zweiten freien Endpunkt ohne Hindernis;

FIGN. 3A, B

die Bearbeitung eines Trennschnittes zwischen einem ersten und zweiten Hindernis mit einem Sägeblatt, das nicht von einem Blattschutz umgeben ist;

FIGN. 4A, B

die Bearbeitung eines Trennschnittes zwischen einem ersten und zweiten Hindernis mit einem Sägeblatt, das von einem Blattschutz umgeben ist;

FIGN. 5A-H

das Wandsägesystem der FIG. 1 bei Erstellen eines Trennschnittes zwischen einem ersten Endpunkt, der ein Hindernis darstellt, und einem zweiten freien Endpunkt ohne Hindernis; und

FIGN. 6A, B

das Wandsägesystem der FIG. 1 beim Erstellen eines weiteren Trennschnittes zwischen einem ersten freien Endpunkt ohne Hindernis und einem zweiten Endpunkt, der ein Hindernis darstellt.

Show it:

FIG. 1

a wall saw system comprising 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 hindrance;

FIGS. 3A, B

the machining 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 machining of a separating cut between a first and second obstacle with a saw blade, which is surrounded by a blade guard;

FIGS. 5A-H

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

the wall sawing system of FIG. 1 when creating another separation cut between a first free endpoint with no obstacle and a second endpoint that is an obstacle.

FIG. 1 shows a wall saw 10 with a guide rail 11, one arranged displaceably on the guide rail 11, the tool unit 12 and a remote control 13. The power tool is designed as a wall saw 12 and comprises a processing unit 14 and a motor drive unit 15. The processing unit is configured as a saw head 14 and includes a saw blade designed as a machining tool 16, which is attached to a saw arm 17 and is driven by a drive motor 18 about a rotational axis 19th

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 wireless and wireless Communication link 41 may be configured in the form of an infrared, Bluetooth, Wi-Fi or Wi-Fi connection.

FIGS. 2A B show the guide rail 11 and the wall saw 12 of the wall sawing system 10 of FIG 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 E ₁ and a second end point E ₂ . As the X direction, a direction parallel to the feed direction 28 is defined, with the positive X direction directed from the first end point E ₁ 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 ₁ , E ₂ free end points without obstruction, wherein at the free first end point E _1, an overlapping is not allowed and at the second end point E _2, an overlap 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 11. The mounting position X _{0 of} the saw head 14 is between the first and second end point 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 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 points E ₁ , E ₂ are defined in the exemplary embodiment by the input of partial lengths. The distance between the mounting position X ₀ and the first end point E ₁ determines a first part length L ₁ 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 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 . 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 ₁ , 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 8 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 is shown, the pivot angle is 0 ° and the axis of rotation 19th 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 processing the separating cut in the region of the end points E ₁ , E ₂ , a disassembly of the blade guard 21 may be provided, for example. If different saw blade diameters are used to machine the cut, various blade protectors with appropriate blade guard widths are usually used.

FIG. 2 B shows the saw arm 17, which is inclined in a negative rotational direction 54 at a negative pivot angle -α. 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 °. In the FIG. 2 B shown 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. Due to the pivotal movement of the saw arm 17 about the pivot axis 23, the position of the rotation axis 19 in the X direction and in the Y direction is shifted. The displacement of the axis of rotation 19 is dependent 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 _γ in the Y direction is δ · cos (± α).

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 (α), where D is the saw blade diameter, h is the penetration depth of the saw blade 16, Δ denotes the perpendicular distance between the pivot axis 23 and the upper side 53 of the workpiece 24, δ the saw arm length and α the first pivot angle, and for the width b the relationship b ² = D / 2 × 8h-4h ² = 4Dh-4h ² applies = 4h · (D - h), where h the depth of penetration 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 _Ref the pivot axis 23 in the X direction, calculate the displacement 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 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) = X _Ref + δ _x - b / 2 and for the second upper exit point 59, X (59) = X _Ref + δ _x + b / 2 where b = √ [h · (D - h)] and h = h (α, D ).

If the end points E ₁ , 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 on the reference position X _Ref the pivot axis 23 and the boundary of the wall saw 12. There is 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 when creating a separating cut between the first end point E ₁ and the second end point E ₂ , which are defined as obstacles, the machining being done without blade guard 21. During 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 , 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 _{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, in the negative rotational direction 54 at a negative swivel angle -α (0 ° to -180 °) inclined saw arm 17. For the first saw blade edge 61 X (61) = X _Ref + δ · sin (-α ) - D / 2 and for the second saw blade edge 62, X (62) = X _Ref + δ · sin (-α) + D / 2. FIG. 3B shows the wall saw 12 with the, in the positive direction of rotation 55 at a positive pivoting angle α (0 ° to + 180 °), inclined saw arm 17. For the first saw blade edge 61 X (61) = X _Ref + δ · sin (α) - D / 2 and for the second saw blade edge 62, X (62) = X _Ref + δ · sin (α) + D / 2.

FIGS. 4A B show the wall sawing system 10 when creating a separation cut between the first end point E ₁ and the second end point E ₂ , which are defined as obstacles, wherein the processing is performed with blade guard 21. When processing without blade guard 21 form 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 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 _{Ref of} the pivot 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, under a negative pivot angle -α (0 ° to -180 °), inclined saw arm 17 and the mounted blade guard 21 of the blade guard width B. In an asymmetric blade protection before the start of the controlled machining, the distances of the rotation axis 19th determined to the blade guard edges 71, 72, wherein the distance to the first blade protection edge 71 as a 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 _Ref + δ · sin (α) -Ba _, 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, under a positive pivot angle α (0 ° to + 180 °), inclined saw arm 17 and the mounted blade guard 21 of the blade guard width B. For the first blade guard edge 71 X (71) = X _Ref + δ · sin (α) _-Ba and for the second blade guard edge 72, X (72) = X _Ref + δ · sin (α) + B _b .

FIGS. 2A , B show a separation section between two end points E ₁ , E ₂ , which are defined as free end points without obstacle, and FIGS. 3A , B and 4A, B show a separation cut between two end points E ₁ , 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 end point E ₁ , which represents an obstacle, and a second end point E ₂ , which represents a free end point without hindrance.

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 α _{0 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 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 section 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 section with a third main section angle α ₃ of Saw arms 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 D _{1 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 B ₁ of the first main section coincide with the first blade guard width B. 1 match. 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 the start of the method according to the invention, the saw head 14 is positioned in a start position X _start , in which the pivot axis 23 is a distance of √ [h ₀ - (D ₀ - h ₀ )] - δ · sin (α ₀ ) to the second end point E having ₂ where h ₀ = h (α _0, D ₀₎ = D _0/2 - Δ - δ · cos (α _0), the depth of penetration of the saw blade into the workpiece 24 in the zeroth main cutting angle α ₀ with the zeroth diameter D _0, which corresponds to the first saw blade diameter D.1. In the starting position, the saw arm 17 is pivoted from the basic position 0 ° in the positive direction of rotation 55 into the positive zero main cutting angle α 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 E ₁ via the first blade protection edge 71.1 of the first blade guard 21.1. The saw head 14 is stopped, if the pivot axis B at a distance of _1/2 23 - has δ · sin (-α ₁₎ to the first end point e. ₁ In this case, the first width B ₁ 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 is pivoted in the negative rotational direction 54 into the negative first main cutting angle -α ₁ and the saw head 14 is moved in the positive feed direction 56 with the saw arm 17 inclined at -α ₁ ( 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 √ [h ₁ * (D ₁ -h ₁ )] + δ * sin (-α ₁ ) to the second end point E ₂ , where h ₁ = h (-α _1, D ₁₎ = D _1/2 - Δ - δ · cos (-α ₁₎ the penetration depth of the first saw blade 16.1 into the workpiece 24 at negative first main cutting angle -α ₁ having the first diameter D _1, which corresponds to the first saw blade diameter D.1. Subsequently, the saw arm 17 is swung in the positive direction of rotation 55 in the positive first main cutting angle α ₁ and removed the residual material.

To change the saw blade from the first blade 16.1 to the second blade 16.2 the saw head 14 is positioned in a parking position and the saw arm 17 is pivoted out of the workpiece 24, wherein the saw arm 17 is pivoted in the embodiment in the basic position of 0 ° ( FIG. 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. At the in FIG. 5B shown parking position, 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 , where h ₂ = h (α ₂ , D ₂ ) = D _2/2 - Δ - δ · cos (α ₂ ) denotes the penetration depth of the second saw blade 16.2 into the workpiece 24 at the positive second main cutting angle α ₂ with the second diameter D ₂ corresponding to the second saw blade diameter D.2.

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, the second end point E ₂ facing, the second upper exit point 59.2 of the second saw blade 16.2 after the pivotal movement of the saw arm 17 in the positive second main section angle α ₂ coincides with the second end point E ₂ ( FIG. 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 α ₂ . The saw head 14 is moved with the, under the second main cutting angle α 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 precut 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 α _crit of -90 °. The critical angle of -90 ° must be taken into account, since the first end point E ₁ must not be exceeded during the pivoting movement. The pivot axis 23 has at the critical angle α _crit of -90 ° to a distance of B.2 / 2 - δ · sin (-90 °) = B.2 / 2 + δ to the first end point E ₁ on. Subsequently, the saw arm 17 is pivoted in 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 ₁ takes place before the processing of the last main section. For this purpose, the saw head 14 is moved with the below -180 ° inclined saw arm 17 (FIG. 6F) in the negative direction of feed 57 until the first sheet protection edge 71.2 of the second blade guard 21.2 coincides with the first end point E _1. The corner processing of the first end point E ₁ can be improved if the second blade guard 21.2 is dismantled and the corner processing takes place without blade protection. Without blade guard, the saw head 14 is moved with the below -180 ° inclined saw arm 17 in the negative direction of feed 57, to the first blade edge of the second blade 61.2 16.2 coincides with the first end point e. ₁

After the corner processing of the first end point E ₁ , the third main section is performed with the, under the negative third main cutting angle -α 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 √ [h ₃ * (D ₃ -h ₃ )] + δ * sin (180 °) = √ [h ₃ * (D ₃ -h ₃ )] having 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 + 8, the penetration depth of the saw blade in the workpiece 24 at the negative third main cutting angle -α 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 is based on the third main cutting a corner processing of the second end point E ₂ ( FIG. 5H ).

At the in FIGS. 5A-H shown separating section, the pivotal movement of the saw arm 17 in a new main cutting angle in each case in a pivoting movement. For hard materials or power-poorer drive motors 18 for the saw blade 16, it may be advantageous to the pivoting movement of the saw arm 17 in at least two steps with intermediate angle execute, between the pivoting movements in the intermediate angle in each case a free cutting of the saw blade 16 takes place.

FIGS. 6A , B show the wall saw system 10 with the guide rail 11 and the wall saw 12 in creating another separation cut between a first end point E ₁ , which represents a free end point without obstruction, 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 E ₁ 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 α ₁ , the saw arm 17, a first diameter D ₁ and a first penetration depth h _{1 of} the saw blade used, and a following second main section having 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.

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 blade 16.2 and the second blade guard 21.2. The first diameter D ₁ and the first width B _{1 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.

• ▪ Demontieren des ersten Sägeblattes 16.1 und ersten Blattschutzes 21.1,
• ▪ Montieren des zweiten Sägeblattes 16.2 und zweiten Blattschutzes 21.2
• ▪ Ausschwenken des Sägearms 17 mit dem ersten Sägeblatt 16.1 aus dem ersten Hauptschnittwinkel α₁ in die Grundposition bei 0° und
• ▪ Einschwenken des Sägearms 17 mit dem zweiten Sägeblatt 16.2 aus der Grundposition bei 0° in den zweiten Hauptschnittwinkel α₂.

The boundary conditions apply to the parking position:

• Dismantling of the first saw blade 16.1 and first blade guard 21.1,
• ▪ Mount 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 α ₁ to the basic position at 0 ° and
• ▪ Swiveling the saw arm 17 with the second saw blade 16.2 from the basic position at 0 ° in the second main cutting angle α ₂ .

The dismounting of the first saw blade 16.1 and 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 embodiment represents an obstacle, an assembly distance Δ _{assembly is} additionally set before the start of the controlled processing. The mounting distance Δ _mounting ensures that between the There is sufficient clearance between the obstacle and the saw blade, or between the obstacle and the blade guard, to grip the blade or blade guard; as mounting distance, for example, 10 cm are suitable.

When working with blade protection, a minimum distance to the second end point (E ₂ ) of B _b .1 + Δ _mounting for the first blade guard 21.1 and B _b .2 + Δ _assembly for the second blade guard 21.2 is basically required. 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 must have a maximum distance of [B _b .1 + Δ _assembly , B _b .2 + Δ _{M assembly} ] 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 cutting angle α _{1 of} the first main section and the second main section angle α _{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 α _crit 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 α _crit of + 90 ° a distance from the second end point E ₂ of B _b .1 + δ sin (90 °) = B _b .1 + 8 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 on ( FIG. 6B ).

With negative first main cutting angles -α ₁ 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 -α ₂ , positive second main cutting angles α ₂ from 0 ° to 90 ° and positive second main cutting angles α ₂ from 90 ° to 180 °, different distances result.

With negative second main cutting angles -α 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 + Δ _mounting , B _b .2 + Δ _mounting ]. For positive second main cutting angles α 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 (α ₂ ) is required and the control unit 29 selects as a parking position For the wall saw 12 the maximum value of [B _b .1 + Δ _mounting , B _b .2 + Δ _mounting , B _b .2 + δ · sin (α ₂ )] for 0 ° <α ₂ ≤ 90 °. For positive second main cutting angle α ₂ of between 90 ° and 180 ° is the necessary for pivoting the second blade 16.2 distance of the pivot axis 23 to the obstacle B _b .2 + δ · sin (90 °) = B _b .2 + δ and the control unit 29 selects as the parking position for the wall saw 12 the maximum value of [B _b .1 + Δ _mounting , B _b .2 + Δ _mounting , B _b .2 + δ · sin (90 °)] for 90 ° <α ₂ ≤ 180 °.

With positive first main cutting angle α ₁ from 0 ° to 90 °, the swiveling 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, a distance of the pivot axis 23 of B _b .1 + δ · sin (α ₁ ) to the obstacle is required. For negative second main cutting angles - α ₂ , positive second main cutting angles α ₂ from 0 ° to 90 ° and positive second main cutting angles α ₂ from 90 ° to 180 ° result in different distances.

For negative second main cutting angles α _2, the pivoting of the second saw blade 16.2 on the opposite side of the obstacle and the control unit 29 takes selects as a parking location for the wall saw 12 the maximum value of [B _b .1 + Δ _mounting, B _b .2 + Δ _assembly, B .1 _b + δ · sin (α _1)]. For positive second main cutting angles α 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 (α ₂ ) to the obstacle required and the control unit 29 selects as a parking position for the wall saw 12, the maximum value of [B _b .1 + Δ _mounting , B _b .2 + Δ _mounting , B _b .1 + δ · sin (α ₁ ), B _b .2 + δ · sin (a ₂ )]. For positive second main cutting angles α 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 29 selects as the parking position for the wall saw 12 the maximum value of [B _b .1 + Δ _mounting , B _b .2 + Δ _mounting , B _b .2 + δ · sin (90 °)].

With positive first main cutting angle α ₁ 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 a distance of the pivot axis 23 of B _b .1 + δ · sin (90 °) = B _b .1 + δ to the obstacle at E _{2 is} required. For negative second main cutting angles -α ₂ , positive second main cutting angles α ₂ from 0 ° to 90 ° and positive second main cutting angles α ₂ from 90 ° to 180 °, different distances result.

Negative second main cutting angles α 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 + Δ _assembly , B _b .2 + Δ _assembly , B .1 _b + δ · sin (90 °)]. For positive second main cutting angles α ₂ from 0 ° to 90 ° is for pivoting of the second saw blade 16.2 a distance of the pivot axis 23 of B _B .2 + δ · sin (α 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 Δ _assembly , B _b . 2 + Δ _mounting , B _b .1 + δ · sin (90 °), B _b .2 + δ · sin (α ₂ )]. For positive second main cutting angles α 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 29 selects as the parking position for the wall saw 12, the maximum value of [B _b .1 + Δ _assembly , B _b .2 + Δ _assembly , 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 blade diameter D.2 of the second saw blade 16.2 replaced.

At the in FIGS. 5A-H and FIGS. 6A , B shown separating cuts, the pivoting movement of the saw arm 17 in the main cutting angle in each case 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 (28)

A method for controlling a wall sawing system (10) comprising a guide rail (11) and a wall saw (12) having a saw head (14), a motorized feed unit (15), the saw head (14) parallel to a feed direction (28) along the guide rail (11) displaces a first saw blade (16.1) and a larger, second saw blade (16.2) in a workpiece (24) of the workpiece thickness (d) between a first end point (E ₁ ) 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) is fixed and driven about an axis of rotation (19), 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 points (E ₁ , E ₂ ) in the feed direction (28), the final depth (T) of the separating cut (51) and a main cutting sequence of m major sections, m ≥ 2 determined, the main cutting sequence at least a first main section having a first main section angle (α ₁ ) of the saw arm (17) and a first diameter (D ₁ ) of the saw blade used in the first main section and a following second main section having a second main section angle (α 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 (+ α ₁ ) or in one to the positive direction of rotation (55) opposite, negative rotational direction (54) under the negative first main cutting angle (-α ₁ ) arranged and - The saw head (14) in a positive feed direction (56) in the direction of the second end point (E ₂ ) proceed, 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 is interrupted by the control unit (29) and the wall saw (12) is moved by the control unit (29) to a parking position. A 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 resumption the controlled processing is positioned by the control unit (29) in a resumption position. Method according to 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), which is 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 (53) of the workpiece (24) are fixed. A 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 second saw blade diameter (D.2) of the second saw blade (16.2) for the calculation of a first parking position and a resume position , which corresponds to the first parking position, is used. A 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 √ [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 ) the penetration depth of the second saw blade (16.2) used in the workpiece (24) second main cutting angle (± α ₂ ) with the preset second saw blade diameter (D.2). A 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 (D _max .2) and a minimum second saw blade diameter (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. A method according to claim 6, characterized in that the pivot axis (23) in the second parking position a distance from the second end point (E ₂ ) of √ [h _{2, max} (D _max .2 - h _{2, max} )] + δ · sin (± α ₂ ), where h _{2, max} = h (± α ₂ , D _{max. 2} ) = D _max .2 / 2 - Δ - δ · cos (± α ₂ ) the maximum penetration depth of the second saw blade (16.2 ) in the workpiece (24) at the second main cutting angle (± α ₂ ) with the maximum second saw blade diameter (D _max .2). A 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. A method according to claim 7, characterized in that before the resumption of the controlled processing, the actual second saw blade diameter (D _real .2) of the second saw blade (16.2) is input and used for the calculation of a resumption position. A 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 √ [h ₂ · (D _re-al .2 / 2 - h ₂ )] + δ · sin (± α ₂ ), where h ₂ = h (± α ₂ , D _real .2) = D _real .2 / 2 - Δ - δ · cos (± α ₂ ) the penetration depth of the second saw blade (16.2) in the Workpiece (24) at the second main cutting angle (± α ₂ ) with the actual second saw blade diameter (D _real .2). A method according to claim 3, characterized in that the second end point (E ₂ ) is defined as an obstacle and additionally a mounting distance (Δ _assembly ) is set before the start of the controlled machining, wherein the mounting distance (Δ _assembly ) for the calculation of a third to fifth parking position is additionally used. A method according to claim 11, characterized in that the saw arm (17) before the interruption of the controlled processing at a negative first main cutting angle (-α ₁ ) between -180 ° and 0 ° 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 [+ Δ D _{1/2 assembly,} D _2/2 + Δ _assembly] is -180 ° ≤ -α ₂ ≤ 0 °, maximum value of [D _1/2 + Δ _assembly , D _2/2 + Δ _mounting, D _2/2 + δ · sin (α _2)] for 0 ° <α ₂ ≤ 90 ° and maximum value of [D _1/2 + Δ _mounting, D _2/2 + Δ _Monta-ge , D _2/2 + δ · sin (90 °)] for 90 ° <α ₂ ≤ 180 °. A method according to claim 11, characterized in that the saw arm (17) before the interruption of the controlled machining at a positive first main cutting angle (+ α ₁ ) between 0 ° and 90 ° 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 [D _1/2 + δ _mounting, D _2/2 + δ _mounting, D _1/2 + δ · sin (α _1)] to -180 ° ≤ -α ₂ ≤ 0 °, maximum value of [D _1/2 + Δ _mounting, D _2/2 + Δ _mounting, D _1/2 + δ · sin (α _1), D _2/2 + δ · sin (α _2)] for 0 ° having <α ₂ ≤ 90 ° and maximum value of [D _1/2 + Δ _mounting, D _2/2 + Δ _mounting, D _2/2 + δ · sin (90 °)] for 90 ° <α ₂ ≤ 180 °. A method according to claim 11, characterized in that the saw arm (17) before the interruption of the controlled machining under a positive first main cutting angle (+ α ₁₎ is located between 90 ° and 180 ° and the pivot axis (23) in the third parking position spaced from the second end point (E ₂₎ from maximum value of [D _1/2 + Δ _mounting, D _2/2 + Δ _mounting, D _1/2 + δ · sin (90 °)] is -180 ° ≤ -α ₂ ≤ 0 ° and maximum value of [D _1/2 + Δ _mounting, D _2/2 + Δ _mounting, D _2/2 + δ · sin (90 °)] for 90 ° <α ₂ ≤ 180 °. Method according to one of claims 12 to 14, characterized in that for the calculation of the third parking position for the first diameter (D ₁ ) 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. A 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. Method according to one of claims 12 to 14, characterized in that the second blade diameter between a maximum second blade diameter (D _max .2) and a minimum second 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. A method according to claim 17, 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. A method according to claim 17, characterized in that before the resumption of the controlled processing, the actual second saw blade diameter (D _real .2) of the second saw blade (16.2) is input and used for the calculation of a resumption position. A method according to claim 19, characterized in that the pivot axis (23) in the resume position a distance from the second end point (E ₂ ) of D _real .2 / 2 for - 180 ° ≤ -α ₂ ≤ 0 °, D _real .2 / 2 + δ · sin (α ₂ ) for 0 ° <α ₂ ≤ 90 ° and D _real .2 / 2 + δ · sin (90 °) for 90 ° <α ₂ ≤ 180 °. A 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) off one 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. A 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 ₁ ) between -180 ° and 0 ° is arranged and the pivot axis (23) in the fourth parking position a Distance to second end point (E ₂ ) of maximum value of [B _b .1 + Δ _mounting , D _2/2 + Δ _mounting ] for -180 ° ≤ -α ₂ ≤ 0 °, maximum value of [B _b .1 Δ _mounting , D _2/2 + Δ _mounting, D _2/2 + δ · sin (α _2)] for 0 ° <α ₂ ≤ 90 ° and maximum value of [B + Δ _b .1 _mounting, D _2/2 + Δ _Mounting , D _2/2 + δ · sin (90 °)] for 90 ° <α ₂ ≤ 180 °. A 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 (+ α ₁ ) is disposed 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 + Δ _mounting , D _2/2 + Δ _mounting , B _b .1 + δ · sin (α ₁ )] for -180 ° ≤ -α ₂ ≤ 0 °, maximum value of [B + Δ _b .1 _mounting, D _2/2 + Δ _mounting, B _b .1 + δ · sin (α _1), D _2/2 + δ · sin (α _2)] for 0 ° <α ₂ ≤ 90 ° and maximum value of [B + Δ _b .1 _mounting, D _2/2 + Δ _mounting, B _b .1 + δ · sin (α _1), D _2/2 + δ · sin (90 ° )] for 90 ° <α ₂ ≤ 180 °. A method according to claim 21, characterized in that the saw arm (17) before the interruption of the controlled machining at a positive first main cutting angle (+ α ₁ ) between 90 ° and 180 ° 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 + Δ _mounting , D _2/2 + Δ _mounting , B _b .1 + δ * sin (90 °)] for -180 ° ≤ -α ₂ ≤ 0 °, maximum value of [B + δ _b .1 _mounting, D _2/2 + δ _mounting, B _b .1 + δ · sin (90 °), D _2/2 + δ · sin (α _2)] for 0 ° <α ₂ ≤ 90 ° and maximum value of [B + Δ _b .1 _mounting, D _2/2 + Δ _mounting, B _b .1 + δ · sin (90 °), D _2/2 + δ · sin (90 ° )] for 90 ° <α ₂ ≤ 180 °. A 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) off 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) is composed and the second distance (B _b .2) is additionally used for the calculation of the fifth parking position. A 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 (-α ₁ ) between -180 ° and 0 ° is arranged and the pivot axis (23) in the fifth parking position a Distance to second end point (E ₂ ) of maximum value of [B _b .1 + Δ _mounting , B _b .2 + Δ _mounting ] for -180 ° ≤ -α ₂ ≤ 0 °, maximum value of [B _b .1 + Δ _mounting , B _b .2 + Δ _Monta-ge , B _b .2 + δ · sin (α ₂ )] for 0 ° <α ₂ ≤ 90 ° and maximum value of [B _b .1 + Δ _mounting , B _b .2 + Δ _assembly , B _b .2 + δ · sin (90 °)] for 90 ° <α ₂ ≤ 180 °. A 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 (+ α ₁ ) is disposed 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 + Δ _mounting , B _b .2 + Δ _mounting , B _b .1 + δ · sin (α1)] for -180 ° ≤ -α ₂ ≤ 0 ° , Maximum value of [B _b .1 + Δ _mounting , B _b .2 + Δ _mounting , B _b .1 + δ · sin (α ₁ ), B _b .2 + δ · sin (α ₂ )] for 0 ° < α ₂ ≤ 90 ° and maximum value of [B _b .1 + Δ _mounting , B _b .2 + Δ _mounting , B _b .1 + δ · sin (α ₁ ), B _b .2 + δ · sin (90 °) ] for 90 ° <α ₂ ≤ 180 °. A method according to claim 25, characterized in that the saw arm (17) before the interruption of the controlled processing at a positive first main cutting angle (+ α ₁ ) between 90 ° and 180 ° 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 + Δ _mounting , B _b .2 + Δ _mounting , B _b .1 + δ · sin (90 °)] for -180 ° ≤ -α ₂ ≤ 0 °, maximum value of [B _b .1 + Δ _mounting , B _b .2 + Δ _mounting , B _b .1 + δ · sin (90 °), B _b .2 + δ · sin (α ₂ )] for 0 ° <α ₂ ≤ 90 ° and maximum value of [B _b .1 + Δ _mounting , B _b .2 + Δ _mounting , B _b .1 + δ · sin (90 °), B _b .2 + δ · sin (90 ° )] for 90 ° <α ₂ ≤ 180 °.

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