Method for machining a glass pane

Abstract

The method for machining a glass pane (1′), wherein the edge (1a) of the glass pane is machined using at least one grinding tool (10), in that the glass pane and the grinding tool, which is set in rotation by means of a motor (11), are moved relative to one another, includes a method step in which a variable that is a function of the power consumption of the motor (11) used to drive the grinding tool is detected along at least a section of the edge (1a′) being machined, and is evaluated to determine the offset of the glass pane (1) with respect to a target position (1).

1 . A method for machining a glass pane, wherein an edge of the glass pane is machined using at least one grinding tool, in that the glass pane and the grinding tool, which is set in rotation by means of a motor, are moved relative to one another, characterized in that a variable (I) that is a function of the power consumption of the motor used to drive the grinding tool is detected along at least a section of the edge being machined, and is evaluated to determine an offset of the glass pane with respect to a target position. 
     
     
         2 . The method according to  claim 1 , wherein the edge is machined in two runs, wherein the values of the variable detected in the second run are used to calibrate the offset determined in the first run. 
     
     
         3 . The method according to  claim 1 , wherein at least one of the following evaluation steps is carried out:
 the value of the variable is determined for the state in which the rotating grinding tool is not in contact with the edge;   values of the variable that result on a section on which the direction in which the edge extends, viewed in the top view of the glass pane, changes by more than a predefined angular value are omitted for the evaluation or are adjusted;   the offset in the direction of a first linear axis (x), in the direction of a second linear axis (y), and/or in a rotational direction are/is determined;   based on the predefined glass pane shape, at least one weighting function is defined which is applied to the detected values of the variable to obtain the offset in at least one direction.   
     
     
         4 . The method according to  claim 1 , wherein a correction is determined which adjusts the target position and the actual position of the glass pane to one another and which is taken into account during machining of the next glass pane, wherein this procedure is carried out until the detected values of the variable are within a predefined tolerance range. 
     
     
         5 . The method according to  claim 1 , wherein a plurality of glass panes is subsequently machined, and in each case a check is made as to whether the detected values of the variable are within a predefined tolerance range. 
     
     
         6 . The method according to  claim 1 , wherein the relative movement between the glass pane and the grinding tool takes place in that only the glass pane or only the grinding tool is moved, or both are moved, the glass pane preferably being rotated and/or moved along a linear axis while the grinding tool is moved along a linear axis. 
     
     
         7 . The method according to  claim 1 , wherein a check is made as to whether the glass pane is free of locations that are unmachined and/or only partially machined, by determining whether the detected values of the variable are below a predefined threshold values, and if this is not the case, information that the glass pane is not completely ground is associated with the glass pane. 
     
     
         8 . The method according to  claim 1 , wherein the detected variable is an electrical variable. 
     
     
         9 . A device for machining a glass pane comprising:
 a support for a glass pane,   at least one grinding tool that is used for machining the edge of the glass pane;   a motor configured to rotate the grinding tool, and   a controller configured to detect and evaluate a variable that is a function of the power consumption of the motor used to drive the grinding tool,   wherein the support and the grinding tool are arranged so as to be movable relative to one another in order to machine the edge, and   wherein the controller is configured to detect the variable along at least a section of the edge being machined, and evaluate the variable to determine an offset of the glass pane with respect to a target position.   
     
     
         10 . The device according to  claim 9 , including a monitor on which information concerning the detected values of the variable, the calculated offset, and/or a calculated correction for adjusting the target position and actual position to one another are/is displayed during operation. 
     
     
         11 . (canceled) 
     
     
         12 . A non-transient computer readable medium containing computer program instructions for causing a controller to perform the method of:
 causing a motor to rotate at least one grinding tool to machine an edge of a glass pane; and   detect a variable that is a function of the power consumption of the motor used to drive the grinding tool along at least a section of the edge being machined, and   evaluate the variable to determine an offset of the glass pane with respect to a target position.   
     
     
         13 . The method according to  claim 8 , wherein the detected variable corresponds to the current consumed by the motor while driving the grinding tool.