Manufacturing method of lip-type seal ring and special tool set
A technology of a lip-shaped seal ring and a manufacturing method, which is applied in the directions of engine seals, engine components, mechanical equipment, etc., can solve problems such as loose coordination, and achieve the effect of avoiding adverse effects.
Active Publication Date: 2016-04-20
JIANGSU EVALVE GRP
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Problems solved by technology
[0004] The object of the present invention is to: aim at the various problems in the prior art above, to propose a lip seal ring manufacturing method and special tooling that can not only achieve the required dimensional accuracy, but also solve the problem of loose fit under low temperature use. Thereby eliminating potential safety hazards and ensuring the safety of oxygen delivery
Method used
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Embodiment 1
[0026] This embodiment is a high-pressure lip seal ring with inner diameter d1 and outer diameter d2, such as figure 1 As shown, its section is U-shaped with an opening width of h. The interior of the U-shaped groove section is composed of a tangentially transitioned circular arc bottom r1 and two circular arc sides r2. Extending in the direction, the two straight end faces are respectively connected with the two arc end faces of r3. When manufacturing, proceed as follows:
[0027] The first step is to mold polytrifluorochloroethylene into figure 2 As shown, the initial ring blank with U-shaped groove section with machining allowance left on each side.
[0028] The second step is to put the initial ring blank into the inner clamp fixture formed by the circumferential apposition of the two halves of the circular mold. The inner clamp fixture is as follows: image 3 , 4 As shown, it is formed by combining the left half-mold 2 and the right half-mold 3 which are respectively...
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The invention relates to a manufacturing method of a lip-type seal ring and a special tool set, belonging to the technical field of manufacturing of valve seal elements. The method comprises the following steps: carrying out die pressing to form an initial annular billet; putting into a backup tong clamp to perform deep freezing; clamping in a lathe, and carrying out finish turning on the inner circle and two end surfaces to prepare a semifinished annular billet; putting into liquid nitrogen for deep freezing, taking out, and polishing the inner circle and two end surfaces subjected to finish turning; putting the polished semifinished annular billet into an outer support clamp to perform deep freezing; on the lathe, carrying out finish turning on the exposed outer circle and U-shaped groove surface to obtain a quasi-finished annular billet; and carrying out deep freezing on the quasi-finished annular billet, and polishing. The method can effectively avoid the influence of the elastic distortion of the material on the dimensional accuracy in the finishing process, and the temperature during processing is equivalent to the temperature during use, thereby avoiding the adverse influence of the heat expansion and cold contraction effect on the sealing property under the operating conditions.
Description
technical field [0001] The invention relates to a method for manufacturing a lip-shaped sealing ring and a special tooling, in particular to a method for high-precision machining of a lip-shaped non-metallic sealing ring for an ultra-low temperature valve, which belongs to the technical field of valve seal manufacturing. Background technique [0002] Lip-shaped non-metallic seals (such as figure 1 As shown) has the advantages of good sealing, not easy to deform and not easy to loosen and fall off, so it has been widely used in valve products. The lip-shaped non-metallic sealing ring used at room temperature has good elasticity, and usually does not need too high dimensional accuracy to meet the sealing requirements. However, for ultra-low temperature LNG valves used in ultra-low temperature environments (such as -196°C--269°C), even if the sealing ring made of low-temperature resistant polychlorotrifluoroethylene material is used, it will harden, making it Elasticity is gr...
Claims
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Login to View More IPC IPC(8): F16J15/10F16J15/328
CPCF16J15/108F16J15/328
Inventor 张艳秋钱玉峰江树勇赵亚楠
Owner JIANGSU EVALVE GRP