The corresponding increased ratio is the molding pressure Product shrinkage. For ultra-long products, during the vulcanization process, due to the difference in the temperature distribution inside the mold, the product will cause thickness in the thickness direction.022mm /mm shrinkage (that is, linear shrinkage rate 1. To overcome this phenomenon, it is better to place the mold in a constant temperature environment to reduce the temperature difference of each part of the mold and increase the wall thickness of the mold appropriately.　　

Here are two representative design examples to illustrate the selection of parting surfaces.8, the mold The cavity size is calculated as follows: where =0. Examples are the shrinkage of products with embedded framework and large products, the calculation formula of cavity size, the mold type of Y-shaped seal ring and grease trap Surface design method, choice of mold material, etc.　　The key to the selection of the 3 parting plane.　　3.

The use of Disposable medical device mould alloy steel such as 40Cr is not easy to deform the mold, and it can also play a role in easy demolding and cleaning. Reasonable design of the mold can ensure the size and reasonable working state of the product, and at the same time facilitate the production of the product and ensure that the product has a high yield rate. In the polyurethane tension sieve,

the skeleton structure is a steel wire rope arranged unidirectionally in the length direction, and the two ends are steel plate hooks.8. See the schematic diagram of the Y-shaped seal ring and its mold parting surface.　　 Schematic diagram of oil-separating bag mold The inner diameter of the sealing sleeve of the oil-separating bag and the cover surfaces at both ends are working surfaces, and there must be no bubbles or flash. The comprehensive shrinkage should be slightly smaller than the outer diameter shrinkage, and the thickness direction shrinkage is also perpendicular to the skeleton surface, and the cavity height is designed. If the deviation of the product is symmetrically distributed in the positive and negative directions, then △ is taken as zero.7~1.