RU2355921C1 - Slide bearing producing method - Google Patents

Abstract

FIELD: engineering industry.

SUBSTANCE: invention refers to engineering industry of laminated items by means of winding, and can be used for manufacturing slide bearings. Slide bearing producing method involves winding of a strip on rotating mandrel with proofing of strip by means of polymeric bonding agent with fillers, tension of strip, maintaining static strip tension during curing and heat treatment. Static strip tension is maintained by mechanical fixing members throughout the volume of the bearing, which are installed after strip has been wound prior to curing and heat treatment. Mechanical fixing members are installed by piercing the web of bearing with metal wire thus forming the inner frame in the form of external and internal stitches connected to each other by connection straps. External and internal stitches are located longitudinally relative to bearing axis and in a staggered order.

EFFECT: improving life time of produced slide bearings.

2 cl, 1 dwg

Description

The invention relates to the field of manufacturing layered wound products and can be used for the manufacture of plain bearings.

A known method of manufacturing a sliding bearing by winding onto a mandrel of a tape with a polymer binder followed by curing (RF patent No. 2147699, class F16C 33/04, B29C 53/60 from 04/20/2000).

However, this method allows stratification of the resulting plain bearings, which leads to wear and destruction of the bearing housing during operation of friction units.

The closest analogue is a method of manufacturing a sliding bearing by winding a tape on a rotating mandrel with impregnating the tape with a polymer binder with fillers to create a tape tension and preserve the tape static tension during curing and heat treatment (RF patent No. 2238448, class F16C 33/04, V29C 53 / 60 dated 10/20/2004).

However, the known method does not allow to obtain the necessary strength and wear resistance of the sliding bearing due to the fact that the creation of static tension of the tape and its preservation is ensured by a lever attached to the mandrel, which does not provide the density of the wound layers (there is a shift relative to each other wound layers) in the curing process of the polymer binder, which leads to the destruction of the friction unit when working with dynamic loads and temperature extremes during prolonged use.

The technical problem to which the invention is directed is to increase the durability of the manufactured plain bearings.

This goal is achieved by the fact that in a method comprising winding the tape onto a rotating mandrel with the tape impregnated with a polymer binder with fillers, creating a tape tension and preserving the static tension of the tape during curing and heat treatment, preserving the static tension of the tape is ensured by mechanical locking elements over the entire volume of the bearing which are installed after winding the tape before curing and heat treatment, and mechanical fixing elements are installed by flashing the bearing wall with a metal wire with the formation of an inner frame in the form of external and internal stitches connected to each other by jumpers. In addition, the outer and inner stitches have a longitudinal axis of the bearing and staggered.

The use of mechanical locking elements throughout the entire volume of the bearing, which are installed after winding the tape before curing and heat treatment, allows you to preserve the pre-tension of the tape fibers throughout the entire volume of the bearing due to the adhesion of the layers relative to each other, not only during curing (as in the analogue), but also during continuous operation. The installation of mechanical locking elements by flashing the bearing wall with a metal wire with the formation of the inner frame in the form of outer and inner stitches connected by jumpers, allows you to implement the method and increase the durability of the bearing when working with dynamic loads due to the fastening action of the frame during long-term operation. The location of the outer and inner stitches longitudinally to the axis of the bearing and in a staggered manner allows maximum use of their effect on the strength of the sliding bearing, while working loads on the friction unit are created during operation in the transverse direction of the bearing axis.

The drawing shows a General view of a plain bearing with a cut along the axis.

An example implementation of the method

A continuous tape is wound from a bobbin, impregnated with a composition (for example, ED-20 epoxy resin with PEPA hardener, graphite and fluoroplastic powders, etc.) and wound on a cylindrical mandrel due to its rotation. The necessary winding pressure between the layers of the tape is created by tensioning the tape by braking the rotation of the bobbin and fixing the first layer of the tape by means of a semi-cured composition on the mandrel.

The winding process is continued until the desired thickness of the sliding bearing 1 is reached. Then, without removing the tension of the tape, mechanical fixing elements made of metal wire are installed (for example, using awl devices, etc.) through the entire volume of the bearing (winding body) (for example, copper) with the formation of the inner frame in the form of outer stitches 2 and inner stitches 3 connected to each other by jumpers 4 (see drawing). In this case, the outer and inner stitches 1, 2 are arranged longitudinally to the axis of the bearing and staggered.

After creating the frame in a semi-cured plain bearing, curing and heat treatment are performed. In the process of curing the composition due to the static tension of the tape and thermal shrinkage, pressure testing takes place, which significantly increases the antifriction and strength properties of the resulting plain bearings.

After the composition is fully cured, the sliding bearing is removed from the mandrel and machined on a lathe by turning the outer surface for fit into the product and aligning the ends.

Unlike analogues, the proposed method provides a tape winding density during the curing of the polymer binder with fillers, which increases the durability of the bearing assembly during prolonged use.

Claims (2)

1. A method of manufacturing a sliding bearing by winding the tape on a rotating mandrel with the tape impregnated with a polymer binder with fillers to create a tape tension and preserve the static tension of the tape during curing and heat treatment, characterized in that the static tension of the tape is maintained by mechanical locking elements over the entire volume of the bearing slip, which is installed after winding the tape before curing and heat treatment, and mechanical fixing e ementy set by firmware metal wire sliding bearing wall to form an inner frame in the form of external and internal stitches interconnected webs. 2. A method of manufacturing a sliding bearing according to claim 1, characterized in that the outer and inner stitches are arranged longitudinally to the axis of the sliding bearing and in a checkerboard pattern.