(l) The processing of the flow groove: in the past, the precision mold processing of the oil-sealed mold groove has not been paid sufficient attention to, the flow groove is often processed too far away from the cavity or the size is not easy to control, making the product pruning difficult, the product is not beautiful. Two open oil seal molds for these problems have been improved, the triangle of the inside of the flow groove size and the product outer diameter of the size of the same (zero to zero), the use of open upper and lower mold here to form a sharp edge shape, oil seal molding, the excess fly edge is cut down, not only simplify the trim process, but also improve the appearance of the product. Because the flow groove and the cavity outer diameter are on different modules, the size does not interfere, and its accuracy is easy to ensure.
(2) the upper mold and the upper mold core 1 of the cooperation processing: the upper mold and the upper mold core 1 of the cooperation for tapered cooperation, in the past using the method of matching, the contact rate is required to reach more than 80%. This traditional processing method is not only difficult, but also takes a lot of work time, still difficult to achieve the ideal effect without flying edge. The processing of the new structure mold adopts the angle of the tilt of the taper hole slightly smaller than the angle of the tilt of the taper shaft, so that the upper mold and the upper die core always fit tightly together at the parting surface b, in a state of no gap, so the product does not have a flying edge here. And mold manufacturing process improvement.
(3) The pressing of the upper die core 1 and the upper die core 2: the pressing of the upper die core 1 and the upper die core 2 is the key to ensure the size and accuracy of the oil seal side lip. The fly edge at the side of the three-open oil seal mold has a great influence on the appearance of the side lip. The new structure mold will be the upper mold core 1 and the upper mold core 2 using over-in-fit, single-body processing, with thermal expansion method pressure synthesis of one, and then by the upper end of the fastening screw will be the upper mold core 2 tightly pulled, effectively preventing the looseness of the two mode cores at the side lip.
(4) The connection between the cavity molds: each single cavity mold and joint plate connection must have a certain amount of floating, in order to ensure that precision mold processing open and close flexible, find accurate. The gap between the single mode and the joint plate is generally controlled at 0. 50111. 0rnm. Too large clearance easy to cause the mold to use the rotating shaft oil seal new structure mold development tilt is too large, mold wear intensified, affecting the life of the mold;
The development of rotary shaft oil seal two-open mold has changed the traditional three-open mold structure type, so that the appearance and performance of oil seal products can be guaranteed, greatly improving the efficiency of work.