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December 28, 2022
The Role of Positioning Operation Specifications in Precision Parts Processing
Be familiar with the positioning method and wear rule of precision reference positioning elements in precision parts processing, and conduct workpiece positioning operation according to the process operation instructions. For example, when using the fixture with side and horizontal precision datum positioning, pay attention to cleaning the surface of the positioning element. The chip on the surface of the horizontal support plate is difficult to remove, so it should be carefully cleaned.
During the installation of workpieces, the method of long distance movement on the positioning element shall not be used for positioning, so as to avoid damaging the accuracy of the workpiece datum and fixture positioning datum.
Generally, thin feeler gauge is used to detect the fitting degree between the workpiece reference plane and the fixture locating surface. It is forbidden to impact or strike the locating element when the workpiece is placed. The method of slight movement and slow approaching is used to make the precision reference plane of the workpiece contact and fit the fixture locating surface.
Due to the workpiece movement and the impact of each placement on the edges and corners of the positioning surface of the support plate, the wear of the support plate is generally at the edges and corners. Another example is to use the horizontal axis of the cylindrical positioning shaft to position the sleeve parts, because each time the workpiece is placed, the workpiece will hit the circumference edge of the guide part when it is sleeved into the positioning shaft.
However, due to the gravity of the workpiece when disassembling the workpiece in the process of precision parts processing, the cylindrical surface and the edge of the positioning shaft will be more worn due to the large friction. Therefore, the parts with large wear of the horizontal positioning shaft should be located at the edge of the connecting part between the shaft end guide part and the positioning cylindrical surface and the upper part of the positioning cylinder.
Therefore, for the fixture with such positioning elements, attention should be paid to overcoming the influence of gravity on the increase of local friction of the positioning elements, so as to extend the service life of the positioning elements of the fixture.
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