# US 2017/0282406 A1 · Method for Controlling a Wall Saw System During the Creation of a Separation Cut

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- Number: US 2017/0282406 A1
- Document ID: US20170282406A1
- Status: Published application
- Kind: A1
- Application number: 15/509,442
- Filed: 2015-09-03
- Published: 2017-10-05
- Earliest claimed: 2014-09-08
- Assignees: Hilti Aktiengesellschaft
- Applicants: Hilti Aktiengesellschaft
- Inventors: Wilfried Kaneider; Dragan Stevic; Christian Bereuter
- Web page: https://patentgrep.com/patent/US20170282406A1

## CPC

- B28D 7/005: {Devices for the automatic drive or the program control of the machines}
- B28D 1/042: {the saw blade being carried by a pivoted lever (B28D1/043 and B28D1/044 take precedence)}
- B28D 1/044: {the saw blade being movable on slide ways (B28D1/043 takes precedence)}
- B28D 1/045: {Sawing grooves in walls; sawing stones from rocks; sawing machines movable on the stones to be cut}
- B28D: WORKING STONE OR STONE-LIKE MATERIALS

## Abstract

A method for controlling a wall saw system during creation of a separation cut in a workpiece between a first and second end point, where at least one of the end points is defined as an obstacle, is disclosed. The separation cut is carried out in a plurality of main cuts. In addition to a main-cut sequence, a corner-cut sequence having at least two corner cuts is defined for each end point defined as an obstacle. For each corner-cut sequence, a starting position and an end position are defined, the corner cuts being carried out therebetween. The wall saw is positioned in the starting position and is pivoted into a first corner-cut angle. Subsequently, the saw head is moved by way of the inclined saw arm until the end position has been reached. The wall saw is displaced back into the starting position and pivoted into a second corner-cut angle.

## Claims

### Claim at position 1

-16. (canceled)

### Claim 17

A method for controlling a wall saw system, wherein the wall saw system comprises a guide rail and a wall saw with a saw head, a motor-driven drive unit that moves the saw head parallel to a feed direction along the guide rail, a saw blade fastened on a saw arm of the saw head wherein the saw arm is pivotable about a pivot axis and around an axis of rotation, and a detachable blade guard surrounding the saw blade;
and comprising the steps of:
creating a separation cut of a final depth (T) in a workpiece of workpiece thickness (d) between a first end point (E1) and a second end point (E2), wherein at least one of the first and second end points is defined as a barrier, by the wall saw system;
wherein, before a start of a processing controlled by a control unit of the wall saw at least a saw blade diameter of the saw blade, positions of the first and second end points in the feed direction, the final depth of the separation cut, and a main cutting sequence of m main cuts, wherein m≧2 between the first and second end points, are determined;
wherein the main cutting sequence comprises a penultimate main cut with a penultimate main cutting angle (αm−1) of the saw arm and a penultimate diameter (Dm−1) of the saw blade, and a final main cut with a final main cutting angle (αm) of the saw arm and a final diameter (Dm) of the saw blade;
wherein, during the processing controlled by the control unit, the penultimate main cut is done with the saw arm inclined at the penultimate main cutting angle (±αm−1), and the final main cut is done with the saw arm inclined at the final main cutting angle (±αm);
and wherein, before the start of the processing controlled by the control unit, in addition to the main cutting sequence, a corner cutting sequence with corner cuts is determined, wherein the corner cutting sequence comprises at least a first corner cut at a first corner cutting angle (±φ1.1, ±φ2.1) of the saw arm and a first diameter (D1.1, D2.1) of the saw blade, and a second corner cut at a second corner cutting angle (±φ1.2±φ2.2) of the saw arm and a second diameter (D1.2, D2.2) of the saw blade.

### Claim 18 (depends on 17)

The method according to claim 17, wherein the corner cutting sequence comprises a number of n corner cuts wherein n≧2 at jth corner cutting angles (±φ1j, ±φ2,j) of the saw arm and jth diameters (D1j, D2j) of the saw blade wherein j=1 to n.

### Claim 19 (depends on 18)

The method according to claim 18, wherein before the start of the processing controlled by the control unit, in addition a saw arm length (δ) of the saw arm, defined as a distance between the pivot axis and the axis of rotation, and a distance (Δ) between the pivot axis and an upper side of the workpiece is determined.

### Claim 20 (depends on 19)

The method according to claim 19, wherein the first end point (E1) is defined as the barrier and wherein for the corner cutting sequence a first end position is calculated by the control unit, wherein the pivot axis in the first end position has a position coordinate X(E1)+Dm/2−δ sin(±αm) for |±αm|≦αcrit and X(E1)+Dm/2−δ sin(±αcrit) for αcrit<|±αm|.

### Claim 21 (depends on 20)

The method according to claim 20, wherein in the jth corner cut of the corner cutting sequence, j=1 to n the saw head is positioned in a first initial position, the saw arm is pivoted into the jth corner cutting angle (±φ1,j) and the saw head with the saw arm inclined at the jth corner cutting angle (±φ1,j) is moved into the first end position.

### Claim 22 (depends on 21)

The method according to claim 21, wherein the pivot axis in the first initial position has a position coordinate X(E1)+D1,n/2−δ sin(±φ1,n) for |±φ1,n|≦αcrit and X(E1)+D1,n/2−δ sin(±αcrit) for αcrit<|±φ1,n|.

### Claim 23 (depends on 17)

The method according to claim 17, wherein the penultimate main cut is done with the blade guard and, before the start of the processing, in addition a mounting distance Δmount and a penultimate width (Bm−1) is determined for the blade guard used with the penultimate main cut, wherein the penultimate width (Bm−1) is made up of a first distance (B1,m−1) of the axis of rotation to a first blade guard edge and a second distance (B2,m−1) of the axis of rotation to a second blade guard edge.

### Claim 24 (depends on 23)

The method according to claim 23, wherein the processing is interrupted by the control unit and the wall saw is moved by the control unit into a first park position.

### Claim 25 (depends on 24)

The method according to claim 24, wherein the pivot access in the first park position has a position coordinate of X(E1)+maximum value of [B1,m−1+Δmount, B1,m−1−δ sin(±αm)] for |±αm|≦90° or X(E1)+maximum value of [B1,m−1+Δmount, B1,m−1−δ sin(±αcrit)] for 90°<|±αm|.

### Claim 26 (depends on 24)

The method according to claim 24, wherein the wall saw, after a resumption of the processing, is positioned in a first resumption position that corresponds to the first park position.

### Claim 27 (depends on 19)

The method according to claim 19, wherein the second end point (E2) is defined as the barrier and wherein for the corner cutting sequence a second end position is calculated by the control unit, wherein the pivot axis in the second end position has a position coordinate X(E2)−Dm/2−δ sin(±αm) for |±αm|≦αcrit and X(E2)−Dm/2−δ sin(±αcrit) for αcrit<|±αm|.

### Claim 28 (depends on 27)

The method according to claim 27, wherein in the jth corner cut of the corner cutting sequence, j=1 to n the saw head is positioned in a second initial position, the saw arm is pivoted into the jth corner cutting angle (φ2,j), and the saw head with the saw arm inclined in the jth corner cutting angle (φ2,j) is moved into the second end position.

### Claim 29 (depends on 28)

The method according to claim 28, wherein the pivot axis in the second initial position has a position coordinate of X(E2)−D2,n/2−δ sin(±φ2,n) for |±φ2,n|≦αcrit and X(E2)−D2,n/2−δ sin(±αcrit) for αcrit<|±φ2,n|.

### Claim 30 (depends on 27)

The method according to claim 27, wherein the final main cut is done with the blade guard and, before the start of the processing, in addition a mounting distance Δmount and a final width (Bm) is determined for the blade guard used with the final main cut, wherein the final width (Bm) is made up of a first distance (B1,m) of the axis of rotation to a first blade guard edge and a second distance (B2,m) of the axis of rotation to a second blade guard edge.

### Claim 31 (depends on 30)

The method according to claim 30, wherein the processing is interrupted by the control unit and the wall saw and saw head are moved by the control unit into a second park position.

### Claim 32 (depends on 31)

The method according to claim 31, wherein the pivot axis in the second park position has a position coordinate of X(E2)−maximum value of [B2,m+Δmount, B2,m+δ (±αm)] for |±αm|≦90° or X(E2)−maximum value of [B2,m+Δmount, B2,m+δ sin(±90°)] for 90°<|±αm|.

### Claim 33

A method for controlling a wall saw system, comprising the steps of:
defining a main cutting sequence for making a main cut in a workpiece;
defining a corner cutting sequence with corner cuts, wherein the corner cutting
sequence comprises a first corner cut with a first corner cutting angle of a saw arm of a saw and a second corner cut at a second corner cutting angle of the saw arm of the saw; and
cutting the workpiece by the saw with the main cutting sequence and the corner cutting sequence.