Specification for positioning methods and wear patterns of positioning components in precision parts processing

The positioning method and wear pattern of precision reference positioning components in the field of precision parts processing require workpiece positioning operations in accordance with the process operation manual. For example, when using fixtures with precise positioning of side and horizontal surfaces, attention should be paid to cleaning the surface of the positioning element. The surface chips of the horizontal support plate are difficult to remove and should be carefully cleaned. When installing the workpiece, it is not allowed to move it over a long distance on the positioning component to avoid damaging the accuracy of the workpiece reference and fixture positioning reference plane. The degree of fit between the workpiece reference plane and the fixture positioning surface is usually detected using a thin feeler gauge.

The placement of the workpiece is prohibited from impacting or colliding with the positioning element. Use a slight movement and gradual approach method to ensure that the precise surface of the workpiece is in contact with the fixture positioning surface. Due to the movement of the workpiece 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. How to use a cylindrical positioning shaft with a horizontal axis to position sleeve parts? Because each time the workpiece is placed, it will hit the circumferential edge of the guide part when inserted into the positioning shaft, and each time the workpiece is disassembled, due to the gravity of the workpiece, the cylindrical surface and edge parts above the positioning shaft will suffer more wear due to high friction. Therefore, The parts with significant wear on the horizontal positioning shaft should be located at the edge of the connecting part between the shaft end guide part and the positioning cylinder surface, as well as the upper part of the positioning cylinder.

Therefore, when using fixtures with such positioning components in the field of precision parts processing, attention should be paid to overcoming the influence of gravity on the increased local friction of the positioning components during operation, thereby extending the service life of the fixture positioning components.