Cnc vertical machine center six-point positioning application:
The meaning of the traditional six-point positioning rule The essence of workpiece positioning is to make the workpiece occupy a certain position in the fixture, so the positioning of the workpiece can be transformed into the problem of determining the coordinate position of the rigid body in the space rectangular coordinate system. In the space rectangular coordinate system, a rigid body has six degrees of freedom, that is, three degrees of freedom moving along the x, y, and z axes and three degrees of freedom rotating around these three axes. Using six reasonably distributed support points to limit the six degrees of freedom of the workpiece so that the workpiece occupies the correct position in the fixture is called the six-point positioning rule.
Generally speaking, the six-point positioning principle is applicable to the positioning of workpieces of any shape. If this principle is violated, the position of the workpiece in the fixture cannot be completely determined. However, when the six-point positioning principle of the workpiece is used for positioning, it must be used flexibly according to the specific processing requirements. Only in this way can the workpiece be quickly obtained in the correct position in the fixture. Specifically, six-point positioning has the following effect.
Positioning situation
Positioning where one or several degrees of freedom of the workpiece are repeatedly restricted by different positioning elements is called positioning. When positioning causes deformation of the workpiece and affects the machining accuracy, it should be strictly prohibited. But when the positioning does not affect the machining accuracy, but can improve the machining accuracy of the CNC machining center, it can also be used, of course, it needs to be analyzed in detail.
2. The situation of under-positioning
The degree of freedom that should be restricted according to the plus I requirements of the CNC machining center without being restricted is called under-positioning. -Under normal circumstances, under-positioning is not allowed because it is difficult to guarantee the processing requirements.
