SU1339439A2 - Method of producing wear=resistant surfaces - Google Patents

Abstract

This invention relates to a process for treating products made of metals, ensuring an increase in the durability of their work, in particular the creation of wear-resistant surfaces of the raceways of bearings. The purpose of the invention is to improve the quality of the product surface by maximizing its boron during processing. The treatment is carried out with an abrasive sandpaper with a discontinuous abrasive surface, the width of the sections of which and the step of their location are chosen taking into account ensuring an optimal spot of contact between the tool and the part. The latter is provided by conducting a finishing process using a pressure in the range of 12-24 kg / cm. 1 tab.

Description

one

And: the invention relates to the technology of processing products from metals, which provides for an increase in the durability of their work, in particular the creation of wear-resistant surfaces up to rolling bearings, and is an improvement of the invention according to aut. No. 1059486.

The aim of the invention is to increase the intensity and depth of diffusion of boron from the tool into the part with wider possibilities of controlling the process, to increase the productivity of one-time and to improve the roughness of the treated surface.

The goal is achieved by thermal cycling of thermal conditions in the contact patch due to the intermittent design of the working surface of the abrasive tool. In the process of thermo.1; cycling, a variable thermal regime is created in the contact patch in a certain range of heating and cooling temperatures of the contact surface, which enhances the surface saturation. The specified width of the abrasive element of the tool and the pressure exerted by it on the surface to be treated provide a certain intensity of the heat flow into the part, and the width of the non-abrasive gap — a certain cooling intensity of the heated part area, while the thermal cycling mode created in the contact patch intensifies the boron diffusion into the part and ensures the ability to control this process using the design parameters of abrasive and non-abrasive gaps. The necessary contact patch is provided by carrying out a finishing process at a tool pressure on the product in the range of 12-24 kg / cm. The table shows the results of the implementation of the method with a pressure on an abrasive tool equal to 16 kg / cm and a contact patch with a length A equal to 10 mm and a width B equal to 10 mm.

For roughing and clean-up of rolling bearings, based on the experimental data, a sandpaper with a width of abrasive areas of 0.5 - 3.0 mm is recommended;

394392

abrasive areas t, 0-5.0 mm, coefficient of application K, 0.5–0.8, where Cc is the coefficient of application: abrasive material, which represents the ratio of the area covered by the abrasive to the working area of the tool.

The proposed method can be carried out with the following modes: I) Ring rotation frequency

Double swing frequency

Radial pressure - 1G1lenie

The processing time of the coolant oil and

2000-4000 rpm

400-900 s

20

thirty

35

12-24 kg / cm 8 - 10 s

12 + 3- 4% oleic acid

The wear resistance of the hardened layer is determined according to the VNIIPP method, which involves the sequential abrasion of the working surface of the bearing ring with a sanding cloth under certain conditions.

The method provides an increase in the wear resistance of the working surface of the rings by 3–3.5 times and the durability of bearings by 3.5–4.5 times during their operation, an increase in productivity by 20–30% and a reduction in roughness by 30–40% during processing, and tool making - saving 30 - 50% expensive materials x x.

Claims (1)

Invention Formula The method of obtaining a wear-resistant surface by auth.St. No. 1059486, similar to the fact that, in order to improve the quality of the surface by providing thermal cycling of the circular flow during the finishing process 5, abrasive sandpaper with intermittently located abrasive areas containing 10-30% boron carbide is used as an abrasive tool a (0.5-3.0) mm; t (1,0-5,0) mm, where a is the width of the abrasive areas; t is the abrasive step plots in this case, the pressure value in the process of treatment is chosen in 1 limits 12–24 kg / cm. 375 600 16 375 600 16 375 600 16 375 600 16 Editor I. Shulla Compiled by V.Vorobyov Tehred M. Khodanych Order 4213/33 Circulation 776 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5 Production and Printing Enterprise, Uzhgorod, ul. Project, 4 ten 0.05 15 0.04 1.5 20 0.046 2.5 12 0.08 Proofreader A.Zimokosov