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What are the requirements of mould processing accuracy

As the main tool for the manufacture of workpieces, moulds are becoming more and more accurate for mould processing due to the increase in demand precision.

l. Processing of glue flow groove: In the past, the processing of the oil seal mould flow glue groove has not been fully paid attention to. The glue flow groove is often processed too far from the cavity or the size is not easy to control, making the product difficult to trim and the product is not beautiful. Two open The oil seal mould has been improved in response to these problems.The inner end of the triangular flow groove is the same as the outer diameter of the product (zero to zero).The split upper and lower moulds are used here to form a sharp edge, oil seal. When moulding, the excess flash is cut off, which not only simplifies the trimming process, but also improves the appearance of the product. Because the outer diameter of the glue groove and the cavity are on different modules, the size does not interfere. Accuracy is also easy to guarantee.

2. Coordination processing of upper mould and upper mould core 1: the upper mould and upper mould core 1 are taper. In the past, the method of research and matching was used, which required the contact rate to reach more than 80%. This traditional processing method is not only difficult Large, and it takes a lot of man-hours, it is still difficult to achieve the ideal effect without flash. The processing of the new structure mould adopts the method that the inclination angle of the cone hole is slightly smaller than the inclination angle of the cone axis, so that the upper mould and the upper mould core are on the parting surface The b part is always tightly fitted together, in a state of no gap fit, so there is no flash on the product here, and the mould manufacturing process is improved.

3. The pressing of the upper core 1 and the upper core 2: The pressing of the upper core 1 and the upper core 2 is the key to ensure the size and accuracy of the oil seal secondary lip. It has a great influence on the appearance of the secondary lip. The new structure mould adopts an interference fit between the upper core 1 and the upper core 2, and after being processed individually, it is pressed into one by thermal expansion, and then tightened by the upper fastening screw. The core 2 is pulled tightly, effectively preventing the looseness of the two cores at the secondary lip.

4. Connection between each cavity mould: the connection between each single cavity mould and the coupling plate must have a certain floating amount to ensure flexible opening and closing of the mould and accurate alignment. Generally, the gap between the single mould and the coupling plate is controlled at 0 .50-1 1.0rnm. If the gap is too large, the development of the new structure of the rotary shaft oil seal mould will be too large when the mould is used, and the mould wear will increase, which will affect the service life of the mould; if the gap is too small, the mould cavity Interference occurred, and it was able to survive.

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