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A kind of processing method of modified polytetrafluoroethylene sealing ring

A polytetrafluoroethylene and processing method technology, which is applied in the direction of engine sealing, engine components, mechanical equipment, etc., can solve the problems of not finding semi-finished products, high cost of mold opening, and small mold specifications, and achieves product size stability, Good wear resistance and small friction coefficient

Active Publication Date: 2015-11-25
广东新志密封技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of large-scale mold opening is high, and the general mold specifications are small. Relatively speaking, the amount of large-scale products is also small; in addition, some non-standard products or special-purpose products may not be able to find suitable semi-finished products for processing.

Method used

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  • A kind of processing method of modified polytetrafluoroethylene sealing ring

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Embodiment 1

[0030] This embodiment provides a kind of processing method of modified polytetrafluoroethylene, and it uses a pair of roller device, see figure 1 , the double-roller device includes inlaid rollers with protruding rings (2) and grooves (1).

[0031] The specifications of the sealing ring prepared in this embodiment are outer diameter D=700 mm, inner diameter d=670, thickness H=30 mm, width L=30 mm, and a batch of 10 pieces.

[0032] The processing method of modified polytetrafluoroethylene comprises the following steps:

[0033] (1) prepare modified polytetrafluoroethylene compound;

[0034] (2) Design of the semi-finished product of modified PTFE sealing material: design the specification and size of the semi-finished product according to the specifications of the finished sealing ring:

[0035] The size design of the semi-finished product of modified PTFE sealing material is calculated according to the outer diameter D, inner diameter d, and thickness H of the finished sea...

Embodiment 2

[0048] The specifications of the sealing ring prepared in this embodiment are outer diameter D=900 mm, inner diameter d=860, thickness H=40 mm, width L=40 mm, and a batch of 10 pieces.

[0049] The processing method of modified polytetrafluoroethylene comprises the following steps:

[0050] (1) prepare modified polytetrafluoroethylene compound;

[0051] (2) Design of the semi-finished product of modified PTFE sealing material: design the specification and size of the semi-finished product according to the specifications of the finished sealing ring:

[0052] The size design of the semi-finished product of modified PTFE sealing material is calculated according to the outer diameter D, inner diameter d, and thickness H of the finished sealing ring, and the radial allowance s and thickness h of the semi-finished product are selected according to the following conditions:

[0053] The design of radial margin s1: a. When the D / d value is less than 1.6, the radial margin s1 is 0.15...

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Abstract

The invention provides a method for processing a modified polytetrafluoroethene seal ring by using a dual-roller device, wherein the dual-roller device comprises rollers which are matched in an embedded way and respectively provided with a convex ring (2) and a groove (1). The method comprises the following processing steps: (1) preparing modified polytetrafluoroethene mixed material; (2) designing specifications of a semi-finished product; (3) setting the rollers: adjusting the width of the two rollers and space between the two rollers; (4) preheating the rollers; (5) charging and rolling to obtain the semi-finished product; (6) separating: separating the semi-finished product from the rollers; (7) processing the semi-finished product on a turning-lathe to obtain a finished product with specific width and thickness. The method disclosed by the invention can process a seal ring by hot extrusion molding; meanwhile, the extruded product has stable size, moreover, mould opening can be omitted, thereby reducing processing cost. The method is applied to the processing of a large polytetrafluoroethene seal ring.

Description

technical field [0001] The invention relates to the technical field of chemistry and chemical engineering, in particular to a processing method of a sealing ring. Background technique [0002] In order to prevent fluid or solid particles from leaking from adjacent joint surfaces and to prevent external impurities such as dust and moisture from intruding into the machine equipment, seals are usually used as part of the material or part. With the development of industry, its application is more and more extensive. The production of seals often adopts mold molding with fixed specifications. A mold can usually only produce a specific specification of seals, and its adaptability is relatively narrow. Moreover, due to its high precision, this type of mold has a short life and is easy to be scrapped. However, the manufacturing cycle of the mold is long, the delivery time is long, the cost is high, and the cost is large. Dimensions and non-standard sealing rings are molded, which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16J15/10F16J15/18
Inventor 周完成周安
Owner 广东新志密封技术有限公司