Functions - Assembly Nesting, Second Part

The following items will be added automatically to the nested assembly part:

• corner loops with bevel info

• height control at inner seams

• height control before corner loops

• side loops

The corner loops are created automatically in all corners. Two consecutive segments defines a corner if the angle between them is larger than the default parameter CORN_LOOP_MINANGLE. It is also possible to get the loops in only those corners where there is a bevel transition. This is controlled with the default parameter CORN_LOOP_CTRL. The loops are unsymmetric (CORN_LOOP_RADIUS must be 0) and consists of 3 line segments. The segments to be burned are always extended the distance DIST_EDGE_STOP outside the raw plate. If DIST_EDGE_STOP < 0 the burning will stop before the edge.

In the corner loops are automatically added all auxiliary functions necessary to control advanced bevel burning. Note that these auxiliary functions are some kind of pseudo functions.

On some burning machines the height control device is in contact with the plate. To get a good result from the burning, especially bevel burning, it is necessary to temporarily switch the height control off when the burner passes an inner seam (the weld extends some millimeters above the plate) and then on again (flying). This is done automatically if both the default parameters HEIGHT_CTRL_OFF_DIST and HEIGHT_CTRL_ON_DIST are > 0.

The height control is always switched off before a corner loop. The same default parameter as above (HEIGHT_CTRL_OFF_DIST) is used.

In some cases it is necessary to change bevel along one or both of the vertical sides of an assembly parts. This can only be done at an inner seam. It is seldom possible to change the bevel parameters on the fly. To solve this problem the side loop has been introduced.

In the general side loop, the right burner is switched off at a default distance (DIST_BURNERS) before the seam. The burning continues the same distance after the seam where the left and main burners are switched off. The tool is then moved (idle) to a position 40 mm before the inner seam and 70 mm outside the raw plate. In this position new bevel parameters are given to the burners and the burning continues with a 30 mm straight line after which the height control is switched off. The burning then continues along a quarter of a circle with 40 mm radius.

The side loops are created automatically. If side loops are present, parallel burning is not possible.

On some burning machines it is also necessary to have a height control at the inner seams for the marking. This is made if both the default parameters MARK_CTRL_OFF_DIST and MARK_CTRL_ON_DIST are > 0. When the starts are created for the marking, all marking lines passing one or several inner seams are treated.

For horizontal inner seams the marking ends at a default distance before the inner seam and starts again at a default distance after the seam. This means that one start is replaced by at least two starts. All starts connected to one marking line will however be treated in sequence to minimize extra idle movement. Parallel start will be kept.

For vertical inner seams the treatment is the same as for the horizontal ones, but parallel starts will be replaced by single starts.