RU2845258C9 - Method of manufacturing polymer separator for bearings - Google Patents

Abstract

FIELD: performing operations.

SUBSTANCE: invention relates to manufacturing of polymer separator for bearings. Proposed method comprises injection moulding in two steps. Surface of separator workpiece obtained at first stage by injection moulding, treated with high-frequency discharge before performing second step in form of pouring polymer material under pressure.

EFFECT: high strength of the article.

1 cl

Description

The invention relates to separators and, more specifically, to methods for manufacturing polymer separators for bearings using injection molding.

A method for manufacturing a polymer separator for a tapered roller bearing using injection molding is known.

(See website https://rubearing.ru/polimemyye-komponenty-dlia-podshipnikov-kachenia).

However, the known method involves injection molding in one stage, which leads to a decrease in the quality of the separator, the accuracy of its manufacture due to the occurrence of internal stresses in the finished product and shrinkage of the finished product.

The closest manufacturing method in terms of technical essence and the achieved effect, and chosen as the closest analogue, is one in which the polymer part is manufactured using injection molding in two stages. In the first stage, a blank part is produced using injection molding, and in the second stage, a casting is produced using injection molding, with a wall of uniform thickness to eliminate the negative effects of plastic shrinkage.

(See patent WO 2004048066 A1 under IPC class B29C 45/16, published 10.06.2004 (D2)).

A disadvantage of the known manufacturing method is the low degree of adhesion of the polymeric materials obtained in the first and second stages of production to each other in the resulting product, which reduces the strength of the product.

The objective of the proposed invention is to preserve the advantages of the method for manufacturing a polymer product in two stages, expressed in the stability and dimensional accuracy of the final product while ensuring a high degree of adhesion of the materials used in the first and second stages of production to each other, to increase the strength (solidity) of the product with high quality and reliability of the final product in the form of a bearing separator.

The technical result that allows solving this problem is the production of a separator by injection molding in two stages. In the first stage, a blank is produced by injection molding, the surface of which is modified by high-frequency discharge treatment. In the second stage, the blank is poured with a polymer material under pressure, and the final product, a polymer separator, is obtained.

The stated objective is achieved by the fact that in the method for manufacturing a polymer separator for bearings by injection molding in two stages, according to the invention, the surface of the separator blank obtained in the first stage by injection molding is treated with a high-frequency discharge before performing the second stage of manufacturing the polymer separator by injection molding.

The modified surface of the workpiece obtained in the first stage acquires a high degree of adhesion to the polymer material used in the second stage of separator fabrication. This is due to the fact that the electric field generated by the discharge disrupts the molecular bonds in the polymer chains on the surface of the material being processed. Due to the specific nature of the plasma-surface interaction, these processes affect only a very thin surface layer no more than 0.1 µm thick, forming a reliable monolithic product in the form of a polymer bearing separator.

Conducted research on patent and scientific and technical sources of information indicate that the proposed method for manufacturing a polymer separator for bearings is unknown and does not follow clearly from the studied prior art, i.e., it meets the criteria of "novelty" and "inventive step".

The proposed method for manufacturing a polymer bearing cage can be implemented using equipment and materials from both domestic and foreign industries, thus meeting the criterion of "industrial applicability." The proposed set of essential features imparts new properties to the claimed method for manufacturing a polymer bearing cage, enabling it to achieve the stated objective of preserving the advantages of the two-stage polymer product manufacturing method, resulting in the stability and dimensional accuracy of the final product while ensuring a high degree of adhesion between the materials used in the first and second stages of production. This enhances strength (solidity) while maintaining the high quality and reliability of the final polymer bearing cage.

The treatment of the surface of the polymer separator blank, obtained in the first stage by injection molding, with a high-frequency discharge before the second stage of separator production ensures a high degree of adhesion of the materials used in the first and second stages of polymer separator production, which in turn ensures the production of a strong, reliable monolithic product in the form of a polymer separator for bearings.

Thus, a combination of essential features allows us to achieve a technical result, manufacturing a separator in two stages. In the first stage, a blank is produced by injection molding, the surface of which is modified by high-frequency discharge treatment. In the second stage, the blank is poured with a polymer material under pressure, and the final product is obtained - a high-strength polymer separator.

The polymer bearing cage is manufactured using injection molding in two stages on an injection molding machine in a special mold. In the first stage, a smaller cage blank is produced, which is treated with a high-frequency discharge using a special corona unit. In the second stage, the cage blank is pressure-molded with a layer of uniform thickness. This increases the cage's strength, improves manufacturing accuracy, reduces internal stress in the material, and thereby improves product quality.

Claims (1)

A method for manufacturing a polymer separator for bearings by injection molding in two stages, characterized in that the surface of the separator blank obtained in the first stage by injection molding is treated with a high-frequency discharge before performing the second stage in the form of pouring the polymer material under pressure.