Rotating-shaft lip-shaped seal ring framework deviation-resisting compacting mold

Abstract

The invention relates to a rotating-shaft lip-shaped seal ring framework deviation-resisting compacting mold composed of a lower mold plate, a lower mold core, an upper mold core and a mold sleeve, wherein the lower mold core is fixedly arranged on the lower mold plate; the mold sleeve is fixedly arranged on the lower mold plate; the upper mold core is positioned above the lower mold core and the mold sleeve; the upper mold core is matched with the mold sleeve through a positioning spigot; the upper end face of the upper mold core is evenly provided with 3-6 rubber injection holes on the same circumference; and the outer cylindrical surface of the lower mold core is circumferentially and evenly provided with a containing groove. The framework deviation-resisting compacting mold can overcome the defect of metal framework deviation of the framework oil seal in the compacting process, and enhances the working accuracy and the service life of the framework oil seal.

Description

Technical field: [0001] The invention relates to a pressing die for a rubber seal, in particular to a pressing die for a skeleton oil seal for a shaft. Background technique: [0002] Skeleton shaft oil seal is an extremely widely used sealing element, which can isolate the parts that need to be lubricated in the transmission parts from the power output shaft, and prevent the lubricating oil from leaking out. [0003] Existing skeleton sealing rings for shafts such as figure 1 As shown, it is composed of a rubber outer ring 1, a metal frame 2, a compression spring 3, a rubber connecting shoulder 4, and a rubber inner ring 5. The cross-sectional shape of the metal frame 2 is a reverse "7" shape. The rubber outer ring 1 and the rubber connecting shoulder 4 are connected to the rubber inner ring 5; the upper end of the rubber inner ring 5 is provided with an auxiliary lip sealing belt 6 and an auxiliary lip deformation cavity 7. The lower end is provided with a main lip sealin...

AI Technical Summary

Problems solved by technology

During the pressing process of the skeleton oil seal, the accuracy of the position of the metal skeleton 2 in the oil seal cavity 15 has a great influence on the precision of the finished skeleton oil seal. At present, it is usually determined by positioning the metal skeleton 2 and the outer circle of the lower mold core 12 The placement position of the metal skeleton 2 in the oil seal cavity 15, because the metal skeleton 2 and the outer circle of the lower mold core 12 inevitably have machining errors during processing, and there must be a space between the metal skeleton 2 and the outer circle of the lower mold core 12 To match the gap, according to the existing glue injection method, when the glue is injected from the injection hole 16 on the upper mold core 13 under unilateral pressure, it will inevitably press the metal skeleton 2 to shift to one side. If the metal skeleton 2 and the lower mold If the fit gap between the outer circles of the core 12 is too large, the position of the metal skeleton 2 in the oil seal cavity 15 will be changed, causing the metal skeleton 2 to shift in the oil seal cavity 15

Since the cutting and trimming process of the skeleton oil seal after pressing are all positioned by the outer diameter of the oil seal, most dimensions of the skeleton oil seal are related to the accuracy of the outer diameter of the oil seal. When the offset of the metal skeleton in the oil seal is too large, The roundness and cylindricity of the outer circle of the oil seal will be out of tolerance, resulting in the auxiliary lip sealing band 6 and the main lip sealing band 8 of the inner ring of the oil seal not being coaxial with the outer diameter of the oil seal, and the out-of-round skeleton oil seal will cause the auxiliary lip The interference between the sealing belt 6 and the main lip sealing belt 8 and the rotating shaft is small on one side and large on the other side. The contact width between the sealing lip and the shaft increases on the side with small interference, and the contact pressure and friction force increase. Rapid build-up of frictional heat causing lip wear and burning, causing severe leaks

The main reason for the above defects is that the structure of the pressing mold of the skeleton oil seal is unreasonable, and the problem of metal skeleton offset cannot be effectively solved during the pressing process

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