Mold for oil seal

Abstract

The present invention provides a mold for oil seal includes an outside diameter upper mold, an oil seal lip mold core and a spring groove lower mold, the oil seal lip mold core is composed of a semi-minor lip mold core, a main lip and a semi-minor mold core, the main lip and the semi-minor lip mold core follow-up with the spring groove lower mold and the semi-minor lip mold core follow-up with the outside diameter upper mold. Applying the mold for oil seal of the invention can assure the machining accuracy and assembly accuracy easily that assures structure of the lip. No matter how much the compound blank weight differs, as long as it can full fill the cavity that can assure products of the same mold with identical lip structure and identical quality. The mold for oil seal can be used for various molding technics of molding, pressure casting and injection, which is suitable for all forms of oil seal production.

Description

technical field [0001] The invention relates to a mold, in particular to a mold for an oil seal. Background technique [0002] Oil seal (oil seal) is the customary title of general seals, simply speaking, it is the seal of lubricating oil. As the name implies: The oil seal is a mechanical element used to seal oil (oil is the most common liquid substance in the transmission system, and also generally refers to the general liquid substance). Oil leaks. [0003] From the sealing function, characteristics, structure type, working state and sealing mechanism of the oil seal, it can be divided into various forms and different names, but it is customary to call the rotating shaft lip seal ring an oil seal. In today's society, there are also many reciprocating lip seals. The ring is called an oil seal. Seals for static seals and dynamic seals (general reciprocating motion) are called seals. [0004] The sealing of the oil seal is formed by the interference fit between a flexible...

AI Technical Summary

Problems solved by technology

[0017] 3. Rubber embryo, in view of the special structure of the oil seal mold, the change of the size and weight of the rubber embryo will directly cause the change of the lip structure of the oil seal, because the amount of rubber is unstable, which will cause the difference in the height of the upper and lower molds, resulting in the main The mold core 3 integrated with the auxiliary lip and the spring groove lower mold 2 change the structure of the main and auxiliary lips A, B, C, L, R of the combined oil seal due to the change in the clamping height of the upper and lower molds, which seriously affects the product quality, which is very difficult. Control, because the weight of the rubber embryos cannot be the same, and it is impossible for different molds of the same type to achieve exactly the same size of the cavity after cutting and assembling

[0018] 4. Trimming. Today, there are two processes for lip forming (A, B angle and R value): one is Japanese-style lip cutting: after forming a semi-finished product, use a trimming machine to trim the lip to adjust and compensate for vulcanization. Structural errors caused by differences in the weight of the rubber embryo and the volume of the cavity, but there must be new errors if there is adjustment, because each semi-finished product will have a slight structural error; the second is the European and American molded lip: use the mold to seal the lip The mouth is synthesized well. When the semi-finished product is finished, the main and auxiliary lips have been finalized. Only the redundant burr is trimmed, and the structure of the lip (A, B angle and R value) is not changed. Although this can avoid trimming errors, it cannot solve the weight of the rubber embryo. Oil seal lip structure error caused by cavity volume difference

[0019] It can be seen from the above that the oil seal structure is very important and the most difficult to guarantee. The foreign advanced level has used high equipment costs to ensure the structure, but it still cannot solve the problem fundamentally.

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