SU1186848A1 - Shell of plain bearing - Google Patents

Abstract

REDUCER BEARING INSERT A rolling mill with non-through lubricating grooves on the working surface having access to alternate butt ends, characterized in that, in order to increase durability, the grooves are inclined to the generatrix and filled alternately with solid lubricant and surfactants with altered surfaces. zkost. about 9 (L with sh o oo

Description

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The invention relates to metallurgical equipment and can be used in rolling stands with sliding bearings.

The purpose of the invention is to increase the durability of the deposit.

FIG. 1 shows a liner, longitudinal section; FIG. 2 - ustnovka inserts in the bearing.

On the working surface of the liner 1, grooves 2 are inclined to the shape of the holes, alternately filled with solid lubricant 3 and surface-active substances (surfactants) 4. The liner is installed in the lower holder 5 of the lower roll podshpnik. The bottom clip is installed in the bottom cushion 6, and the top clip 7 is attached to the pad by bolts. In the bearing the lower roll pin 8 is resting 9.

The insertion width 6 has a groove 2, open alternately in the direction of the opposite ends. The number and size of the grooves is determined by the dimensions of the liner. The length of the grooves b is equal to 0.6–8, and the depth is equal to the allowable wear of the insert. The grooves are alternately filled with solid grease and surfactant. The viscosity of the contents of the cells towards the exit edge of the insert (in the direction of the arrow) decreases.

For example, soap glue is used as a surfactant. Solid lubricants can be compositions based on epoxy resins and graphite. The varying viscosity of the cell contents is achieved by adding a plasticizer to the lubricant. In the grooves of a textolite bearing, it is recommended to apply solid lubricants of the following compositions,%:

Composition I. Epoxy

resin7.6

Hardener

(polyethylenepolyamine) 6.5

Plasticizer

(dibutyl phthalate) 8.5

Aluminum

powder9.0

Composition II

Epoxy

resin42

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Hardener 6 Plasticizer 12 Graphite40

Graphite and aluminum, used in powder form, are adsorbed onto

spigot surfaces to form a lubricating layer. Epoxy resin is a binder for graphite and aluminum powders. The required viscosity is 0 Solid lubricants are obtained by adding 6-6.5% hardener and 8.5-12% plasticizer. At other ratios, the lubricant is obtained either insufficiently plastic (vitreous) and either liquid, which flows out of the cells of the insert.

Solid lubricant is prepared as follows.

The lubricant components are mixed in a 0 vessel heated in hot water up to 70-80 C. The mixture is inserted into the grooves with inserts in which it thickens.

Surfactants 5 depending on the composition of the solid

Lubricants and specific operating conditions can have various purposes: to increase the strength of the lubricating film, to help reduce friction in the lubricating layer, to be used for leaching of wear products, to prevent pin corrosion. In textolite sliding bearings of rolling mills that are cooled by water, it is advisable to use a graphite solid lubricant for which water is already a surfactant. However, since water is corrosive, pins, then soap glue should be used as an additional surfactant to prevent pins from corroding and facilitating leaching of wear products.

Soap glue is a product of paraffin oxidation, containing 86% of monocarboxylic fatty acids in fractions, in the form of soaps, 4% dicarboxylic acids, 10% of unwashed hydrocarbons. 25% water solution of soap glue is known as

ASNK-50.

 Surfactants are introduced in the amount of 1-2% in the composition of a mixture of epoxy resin, plasticizer (8.5-12%) and hardener (6-6.5%).

To reduce the viscosity of the contents of the cells towards the output side of the insert

3

bearing, it is necessary to vary the content of plasticizer and hardener within the specified limits. In general, the components of a solid lubricant and surfactant and their percentage content are determined experimentally.

A technological force acts on the roll of the stand along the arc L. The maximum pressure P is located at a distance A from the axis of the centers of the rolls. Points K and K are the bearing area of the bearing. When the roll rotates, its section L enters into contact with the working surface of the bearing insert.

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During contact, a layer of surfactant is applied to the roll axle, followed by a layer of solid lubricant, which is present. surfactant forms a durable lubricant

5 layer. Passing the carrier zone, the axle portion re-enters the groove location where the lubricating layer is restored. When the axle section leaves the zone of friction, 10 it gets exposed to water. Due to the presence of surfactants with detergent properties in the lubricating layer, the lubricating layer is cleared of wear products, which increases its lubricating effect.

Claims (1)

SLIDING BEARING INSIDE of the rolling mill with non-through lubricating grooves on the working surface, which have alternately access to opposite ends, characterized in that, in order to increase durability, the grooves are made inclined to the generatrix and are filled alternately with solid lubricant and surface-active substances with a varying viscosity. FIG. 1