Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1987-03-27
1988-10-11
Fisher, Richard V.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
2642711, 264127, 264257, 2642974, B29C 4318, B29C 6502
Patent
active
047770031
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to mechanical engineering and is specifically concerned with a method of producing plain bearing shell with shock-absorbing anti-friction coating.
BACKGROUND ART
There is known a method of producing a plain bearing shell with shock-absorbing anti-friction coating (cf. USSR Inventor's Certificate No. 183174 of July 27, 1960, published on June 17, 1966 in Journal of Discoveries, Inventions, Industrial Designs, Trademarks No. 13).
In the known method of producing a shell with shock-absorbing anti-friction coating, a blank is formed by punching randomly arranged metal wire helices which get tangled under the pressure.
The blank is placed in a die and overlaid with a sheet of fluoroplastic of a shape corresponding to the outline of the inner cavity of the die in plan. The die is heated up to around 200.degree. C. integrally with the blank and fluoroplastic sheet, punched under a pressure of some 50 MPa with a pause, and cooled under the same pressure for 20-30 min.
The known method cannot provide for an adequate strength of the coating due to poor bonding of the fluoroplastic sheet to the blank.
Under the conditions of the known process, the fluoroplastic sheet penetrates the blank by an amount less than three diameters of the wire made wherefrom are the helices. As a result, the fluoroplastic sheet separates from the blank in service.
This defect is particularly prone to occur at elevated temperatures, under loads applied tangentially to the surface of the fluoroplastic sheet, during the starting and stopping of the equipment used wherein is the bearing shell, and in case of a high vibration.
DISCLOSURE OF THE INVENTION
The principal object of the present invention is to provide a method of producing plain bearing shells with shock-absorbing anti-friction coating which ensures high quality of shells.
This object is realized by contemplating a method of producing plain bearing shells with shock-absorbing anti-friction coating consisting in placing a blank in the form of a compressed tangle of metal wire helices into a die, overlaying the blank with a sheet of fluoroplastic of a shape corresponding to the outline of the inner cavity of the die in plan, heating the blank and the fluoroplastic sheet, punching the blank and the sheet with a time delay without relieving of the pressure and cooling them, wherein according to the invention the temperature of the heating-up is 220.degree.-260.degree. C., the punching is carried out under a pressure of 100-150 MPa with a time delay of 4-6 min and the cooling takes place after removing the pressure.
By implementing the disclosed method of producing a plain bearing shell with shock-absorbing anti-friction coating, referred to hereinafter as the disclosed method for the sake of brevity, the quality of shells is improved.
Tiny columns of fluoroplastic that form at the surface of the fluoroplastic sheet due to the heating up and punching penetrate the blank through a distance which invariably equals 3 to 5 diameters of the wire made wherefrom are the helices of the blank, establishing thus a firm link between the sheet and the blank.
The long-term strength of bonding is not influenced by the effect of elevated temperatures, vibrations loads and loads applied along a line tangent to the surface of the fluoroplastic sheet.
Moreover, the disclosed method yields shells with a stable elastic and shock-absorbing behaviour. A constant depth of penetration of the blank by the columns of fluoroplastic indicated above caters for this property of shells.
A stable elastic behaviour, in its turn, provides for uniform distribution of load over the surface of a shell produced by the disclosed method as well as between the shells of a plain bearing when this is composed of more than one shell produced by the disclosed method.
This applies, for example, to a thrust bearing of hydraulic turbine made up of several self-adjusting pads arranged in a circle.
The fact that the cooling takes place on removing the pressure increases the productivity of th
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Baiborodov Jury I.
Ezhov Anatoly N.
Kodnir Ita N.
Litvinov Evgeny V.
Manenkov Jury A.
Cheboxarsky Elektromekhanichesky Zavod
Fisher Richard V.
Kuibyshevsky Aviatsionny Institut
Lee Coreen Y.
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