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Once-forming mould for rotary shaft lip seal and moulding method thereof

A lip-shaped sealing ring and forming mold technology, which is applied to home appliances, other home appliances, household components, etc., can solve the problems of damaged knife tip, knife tip wear, inconvenient product production and management, etc., and eliminate the failure of the sealing ring Hidden dangers, reducing machine adjustment errors, and highlighting the effect of substantive features

Active Publication Date: 2009-04-22
广东天诚密封件股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Chinese patents 96228702.4, 98209702.6, and 200420022202.8 all disclose the structure of the rotating shaft lip seal ring, which uses the skeleton as a support, wraps the skeleton after vulcanization of rubber, and uses the lip as the sealing working part. The traditional processing method of this product is adopted figure 1 After the traditional processing mold vulcanizes the rubber, the lip is formed by calculating the trimming process parameters and trimming with a tool; however, for the vulcanized rubber, especially the fluorine rubber with excellent material, it has high strength and is easy to produce sharp edges. Abrasion, or a small amount of impurities in the rubber will also damage the tip of the knife. If the tip of the refurbished product is not sharp enough or damaged, it will cause burrs and serrations on the lip of the product, which will make it seal when it cooperates with the shaft. There is a risk of leakage
At the same time, during the second molding, that is, the repairing molding, the randomness of unstable quality of different batches of products will also occur, which is extremely inconvenient for the production and management of products

Method used

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  • Once-forming mould for rotary shaft lip seal and moulding method thereof
  • Once-forming mould for rotary shaft lip seal and moulding method thereof
  • Once-forming mould for rotary shaft lip seal and moulding method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: A rotary shaft lip seal ring one-time forming mold

[0024] refer to image 3 , is the mold structure of an embodiment of the present invention, in the figure, the side mold of this mold structure is not shown; The mold structure of this embodiment of the present invention has an upper mold 1 and a lower mold 2, and the lower mold 2 is provided with a lip cavity 3. The front lip angle α of the lip cavity 3 is 45±5 degrees, and the rear lip angle β of the lip cavity 3 is 25±5 degrees; when the upper mold 1 and the lower mold 2 are closed, the sharp point 4 of the lip cavity The offset distance R from the center of the convex ring 5 of the upper mold 1 is 0.25 ~ 0.55mm; the inner diameter ID of the mold at the sharp point 4 of the lip cavity m The rubber shrinkage value is added to the inner diameter ID of the lip of the sealing ring, and the shrinkage value is 0.3-0.5mm; the molding cavity 9 of the upper boss 8 of the lip 12 of the sealing ring is reserved on...

Embodiment 2

[0026] Example 2: One-time forming method of a rotating shaft lip seal ring

[0027] refer to image 3 , Figure 4 , the one-shot molding method includes:

[0028] 1), the one-time forming mold includes an upper mold 1 and a lower mold 2, and a lip cavity 3 is directly processed on the lower mold 2. The front lip angle α of the lip cavity 3 is 45 ± 5 degrees, and the rear lip angle β of the lip cavity 3 is 25±5 degrees; when the upper mold 1 and the lower mold 2 are closed, the offset distance R between the sharp point 4 of the lip cavity and the center of the convex ring 5 of the upper mold 1 is 0.25 ~ 0.55mm; the sharp point 4 of the lip cavity Die inner diameter ID m The rubber shrinkage value is added to the inner diameter ID of the lip of the sealing ring, and the shrinkage value is 0.3-0.5 mm; the forming cavity 9 of the upper boss 8 of the lip 12 of the sealing ring is reserved on the upper part of the lip cavity 3;

[0029] 2), using the above-mentioned one-time fo...

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Abstract

The invention relates to a one-step forming die for a rotary shaft lip-shaped seal, and a forming method thereof. The forming die is provided with an upper die and a lower die, wherein the lower die is provided with a lip cavity, the front lip angle of the lip cavity is between 40 and 50 degrees, and the rear lip angle of the lip cavity is between 20 and 30 degrees; when the upper die and the lower die are matched with each other, the off-centering distance between the tip of the lip cavity and a convex ring of the upper die is between 0.25 and 0.55 millimeter; and the die inner diameter of the tip of the lip cavity is equal to the inner diameter of a seal ring lip plus the rubber shrinking value, and the shrinking value is between 0.3 and 0.5 millimeter. The forming method comprises the following steps: adopting the forming die, putting a framework into the forming die as a support, pouring rubber into the forming die, vulcanizing the framework enwrapped by the rubber, performing one-step forming on the framework, and mounting a spring on the framework to form a rotary shaft lip seal. The forming die and the forming method have the advantages of simple die structure, convenient forming, one-step forming, no secondary lip refit and forming, and removal of the hidden trouble of the seal ring failure, thus the forming die and the forming method are applicable to processing the rotary shaft lip seal.

Description

technical field [0001] The invention relates to a one-time molding die and a molding method for a lip-shaped sealing ring of a rotating shaft. Background technique [0002] Chinese patents 96228702.4, 98209702.6, and 200420022202.8 all disclose the structure of the rotating shaft lip seal ring, which uses the skeleton as a support, wraps the skeleton after vulcanization of rubber, and uses the lip as the sealing working part. The traditional processing method of this product is adopted figure 1 After the traditional processing mold vulcanizes the rubber, the lip is formed by calculating the trimming process parameters and trimming with a tool; however, for the vulcanized rubber, especially the fluorine rubber with excellent material, it has high strength and is easy to produce sharp edges. Abrasion, or a small amount of impurities in the rubber will also damage the tip of the knife. If the tip of the refurbished product is not sharp enough or damaged, it will cause burrs an...

Claims

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Application Information

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IPC IPC(8): B29C39/26B29C69/00B29C39/10B29C33/00B29C65/00B29K21/00B29L31/26
Inventor 吴克胜
Owner 广东天诚密封件股份有限公司