RU2550902C1 - Fabrication of thin-wall self-lubing antifriction bearing by coiling with metal tape - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to production of parts by coiling in machine building. Proposed process consists in brass 1-2 mm deep tape with grooves pre-rolled on its working surface and filled with solid-lubricant graphitized polymerizing material is wound, turn-to-turn, onto mandrel to get a tubular workpiece. Then, solids of revolution are placed thereat and locked by anaerobic material. Friction units are cut off over antifriction bearing width.

EFFECT: better manufacturability, lower friction factor, increased MTBF.

7 dwg

Description

The invention relates to a technology for manufacturing components and machine parts, and in particular to methods for manufacturing self-lubricating thin-walled plain bearings used in friction units.

A known method of manufacturing a sliding bearing (RF patent No. 2194888, class F16C 17/00, F16C 33/10, B29C 53/60 of 12/20/2002), in which by winding on the mandrel of a continuous tape impregnated with its polymer binder receive the outer strength layer and form an internal antifriction layer with the formation of pockets with a lubricant and subsequent curing. The formation of pockets is carried out by introducing a lubricant under pressure through punctures in the outer strength layer. Punctures after the introduction of the lubricant are eliminated. EFFECT: increased durability of sliding bearings and manufacturability.

The disadvantage of this method is the high complexity of the manufacturing process, the low strength characteristics of the substrate due to the violation of the integrity of the outer layer, the relatively large thickness of the wall of the sliding bearing, limiting its use.

Closest to the technical result is a method of manufacturing a sliding support (RF patent No. 2274777, class F16C 33/14 of 04/20/2006), which provides for grooves, application of antifriction material and its subsequent deformation within the elastic deformations of the base material. The antifriction material is applied in the form of a galvanic coating based on soft metals, and the deformation force is set in the range of its yield strength and strength. The grooves are made by vibration rolling, and the coating is applied by electrostoring.

The disadvantage of this method is the high material consumption, the complexity of the manufacturing process of the bearing, the tendency of the antifriction coating to frictional heating without additional lubrication with liquid or grease.

The technical result of the proposed method is to increase the manufacturability of manufacturing a thin-walled sliding bearing, bringing the metal utilization rate to 0.95, reducing the friction coefficient in the self-lubrication mode, increasing the operating time of the friction unit to failure compared to using conventional thin-walled bushings as sliding bearings. This is achieved by the fact that the method involves the manufacture of a sliding bearing by winding a brass tape 1 ... 2 mm thick end-to-end, coil to coil, on a rotating mandrel, additionally pre-knurled on its working surface of the grooves and filled with graphitized solid lubricant on a polymerizable base, followed by landing on anaerobic material to form a thin-walled tube-like blank of parts-bodies of revolution and a segment of the friction units obtained.

Unlike well-known analogues, a new plain bearing is manufactured without the use of turning and milling operations, which leads to the consumption of billet metal in the chip more than 50%. Obtained on the working surface of the bearing grooves (Fig. 1), filled with solid lubricant (Fig. 2), provide rotaprint lubrication of tribological conjugation during the entire life of the bearing. The depth of the grooves is commensurate with the maximum wear of the bearing (figure 3).

The developed method is carried out on a lathe, in a three-jaw chuck of which a round mandrel is fixed (Fig. 4) with a diameter equal to the inner diameter of the bearing and supported by a lunette bracket (Fig. 5). A brass strip is screwed onto the mandrel through the tensioner (see Fig. 5), on the working surface of which, using the rolling rollers of a special device (Fig. 6), consisting of a roller 1, a fork 2, a housing 3, a spring 4, grooves are formed depths filled with polymerizable solid lubricant (graphite-based) material.

The manufacture of a bearing with a self-lubricating surface is as follows.

A brass tape of a certain thickness is pulled through the rolling rollers (FIGS. 2, 6), forming grooves of the required depth on the working surface. The grooves are filled with polymerizable solid lubricant (graphite-based) material. The tape through the tensioner is fed to a mandrel of circular cross section with a diameter equal to the inner diameter of the bearing. The mandrel (figure 4) is fixed in a three-jaw chuck of a lathe. The feed of the tape is carried out at an angle to the axis of rotation, forming a winding pitch. A gap between the turns is not allowed.

An anaerobic material is deposited on the outer surface of the tube-shaped workpiece, which ensures fixing of the installed parts-bodies of rotation on a thin-walled sliding bearing (for example, satellites 1, Fig. 7). After polymerization of the anaerobic material, the friction units assembled in this way are cut off on the mandrel along the width of the sliding bearing with a cutter 2 fixed in the support of the lathe.

Claims (1)

A method of manufacturing a thin-walled self-lubricating sliding bearing, characterized in that a brass strip is wound end-to-end to a turn with rolls of predetermined depth and profile filled with hard-lubricant material pre-formed on its working surface by knurling, and a tube-like blank is obtained for which, using an anaerobic material, set the rotation body parts, followed by their cut along the width of the sliding bearing on the mandrel.

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