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Preparation method for metal-based polytetrafluoroethylene bearing

A technology based on polytetrafluoroethylene and polytetrafluoroethylene film, which is applied in the field of preparation of metal-based polytetrafluoroethylene bearings, can solve the problem that the long-term use temperature cannot be higher than 120°C, and achieve low one-time investment costs and stripping The effect of increased strength and simple equipment

Inactive Publication Date: 2012-02-01
SHANGHAI PLASTICS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The PTFE on the surface of the bearing prepared by this method has obvious contact marks, and the use temperature is affected by the binder 1,1-difluoroethylene and perfluoropropylene compound. The long-term use temperature should not be higher than 120°C

Method used

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  • Preparation method for metal-based polytetrafluoroethylene bearing
  • Preparation method for metal-based polytetrafluoroethylene bearing
  • Preparation method for metal-based polytetrafluoroethylene bearing

Examples

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Embodiment 1

[0026] Example 1: Prepare a high-speed water-lubricated bronze-based polytetrafluoroethylene bearing. The operating temperature is 120° C., the bearing speed is 8000 r / min, the working medium is boiler water, and the working water pressure is 1.2-1.5 MPa.

[0027] 1) Process the bronze blank to figure 2 Among them, 1 is the baffle plate, which prevents polytetrafluoroethylene from overflowing due to expansion during sintering, and is the processing benchmark, 2 is the metal blank processing baseline, which belongs to the non-processing area, and 3 is the area covered with polytetrafluoroethylene film, which belongs to In the processing area, sandblasting, spraying of fusible fluororesin coating and coating of polytetrafluoroethylene film are required in this section, and the specific process parameters are different according to the final product;

[0028] 2) Use a high-pressure sandblasting air gun to spray sand particles with a particle size of about 0.5mm on the area that ...

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Abstract

The invention relates to a preparation method for a metal-based polytetrafluoroethylene bearing. The method comprises the following steps of: (1) machining a metal blank; (2) performing sand blasting; (3) spray-coating a meltable fluororesin coating; (4) covering a polytetrafluoroethylene film; (5) covering a glass tape; (6) sintering; and (7) machining a finished product. By adopting the method,since the meltable fluororesin coating is additionally arranged between the polytetrafluoroethylene layer and metal, stripping strength between the polytetrafluoroethylene layer and metal is increased; the polytetrafluoroethylene layer and metal layer are compounded together through high temperature; a formula of polytetrafluoroethylene is not limited and can be adjusted with high flexibility according to actual requirements; the type of the metal adopted by the bearing can be expanded, namely the metal can be a tough metal material, and can also be a friable metal material; and finally, the prepared metal-based polytetrafluoroethylene bearing does not have a weld joint or a connection point, the dimensional accuracy can be accurately controlled, and the high-accuracy requirements of aerospace and military machinery on dimension are met.

Description

technical field [0001] The invention belongs to the technical field of fluoroplastic processing, and in particular relates to a method for preparing a metal-based polytetrafluoroethylene bearing. Background technique [0002] Metal-based PTFE material, as a self-lubricating material, combines the advantages of metal and PTFE, with high mechanical strength, good thermal conductivity, small thermal expansion coefficient, low friction coefficient, excellent wear resistance and wide operating temperature range specialty. Bearings made of this material are widely used in food, medical, aerospace, shipbuilding and other fields. [0003] Publication No. CN 101074702A Chinese patent discloses a method for preparing a metal-based polytetrafluoroethylene self-lubricating bearing with a three-layer structure. This patent describes such a three-layer structure, a metal layer, a sintered bronze powder layer, and a filled polytetrafluoroethylene layer . The bearing prepared by this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C33/14
Inventor 方秋利
Owner SHANGHAI PLASTICS RES INST CO LTD
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