SU1299699A1 - Method of producing races of radial thrust bearings - Google Patents

Abstract

This invention relates to methods for producing bearings from high alloy steels. The method allows to increase the durability of the bearings. For this, the profile of the groove of the bearing ring is pre-formed by turning in the form of conical surfaces with an angle of inclination of their forming to the axis of symmetry of the ring, equal to the angle of contact of the bearing. At the same time, the hardness and depth of the layer is greatest at the points of contact, 2 ° C. f-ly, 3 ill.

Description

one

The invention relates to mechanical engineering, in particular to the bearing industry, and can be used in the manufacture of special bearings from high-alloyed. corrosion resistant and heat resistant steels.

The purpose of the invention is to increase the bearing resistance by creating 10 hardened layers on the working surface of their rings.

Figure 1 presents the form-; trenching on the bearing ring; FIG. 2 is a diagram of mutual spacing-} 5 of the roll of the roller and the ring blank j with the chute before the final chute rollout (initial position); FIG. 3 is a diagram of the final formation of a groove on the ring of the workpiece - 20 ki.

The method is carried out as follows.

On the workpiece 1, the bearing rings are preliminarily formed, for example, by turning, the profile of the groove formed by two conical surfaces 2, symmetrical about a plane perpendicular to the axis of rotation of the workpiece, which form are inclined to the axis of the workpiece at an angle and After that the workpiece 3, finally forming a reinforced gutter profile (FIG. 2),. Wherein the roller 3 primarily relates to the preparation at points A corresponding to the points of contact of the ball with the ring A at the final both, and in those places the metal deformation during roll-out maximum and, consequently, maximally and a thermomechanical hardening of the profile trough

The depth of the preforming chute hnp is determined as follows (Fig. 3):

pr OS

 EU OS OA

Of

COSJ3

R

cosp

roll-out roller radius and final gutter profile} maximum deformation at

rolling out

the depth of the final gutter;

, 0,6 - attenuation of the depth of the pre-gutter to the depth of the final.

- "AT. . D

 cosp

+ h

.Rl: f; | e.H (, - K.,.

With allowance for grinding, the radius of the withdrawable trough is assumed to be: R 0.50, where} is the diameter of the bearing ball, the depth of the trough h for standard bearings, incl. radial-stop, equal to h 0.20.

Then

pr - D

DV HcosP 2 cos l: cbsP .2cosp

 n +

 “2cosp, o, 4 ... 06; TO

+ 0.2D (1-K,) 0.2 (l-K,) j

TO).

 0.08 ... 0.12.

five

0

50

0

P

For

the standard contact angles 12,, 26 and 36 are respectively (0.090., .131) D ",; (0.136 ... 0.176) 0 and (O, 218 ... O, 268) 0.

An example is a non-standard radial thrust bearing type I-5996 with a split inner ring and a design contact angle (20 made of steel 95X18-W. Bearing dimensions 120-65, 223 mm. D 16.67 mm. Inside- | - detachable, billet: on which the chute rolls out, goes into two half-rings. The depth of the final chute is h 3.3 mm; radius R is 9 mm.

The blanks were made with the pre-formation of the gutter by the method of turning according to the known and proposed method with different hflp (see table). Low-temperature thermomechanical 5 processing (LTMO) blanks: preheating to, heating to 1080 C, landing on the mandrel, warming up 600-500 С, rollout of the trough with rollers in the MB-1 machine, air cooling to the workshop temperature, low-temperature processing (-70 С, 1 h), tempering at.

The results of measurement of hardness and distortion are presented in the table.

Distortion was expressed by fibrous on the inner diameter and the collapse of the ends. The microstructure and microhardness of the hardened layer under a load of 00 g (1H) were studied on transverse polishing, the microhardness value HV 0.1 was transferred to HRCg. The table shows the hardness at the surface of the gutter and the depth of the hardened layer at three points corresponding to the intersection points of the gutter, with a radius inclined at an angle to the plane of symmetry of the workpiece (at the point of contact and on both sides of it at an equal distance).

As can be seen from the table, the distribution of hardness and depth of the hardened layer along the gutter with a known manufacturing method is not satisfactory. When machining the ring blank according to the proposed method, the greatest hardness and depth of the layer is at the points of contact (ci -B). The best results were shown by billets with 1 | 9 and 2.4 mm, calculated by Н „р D (К).

where K is 0.08 and 0.12. At a larger value (h 3, 2 mm), the hardening and depth of the layer were smaller, and at

lower value (h warped.

etc

1.2)

Claims (2)

1. A method of manufacturing rings of radial thrust bearings, mainly detachable with a calculated contact angle, consisting in the preliminary formation of a groove of the ring blank and its subsequent R- 59 64.0 62.5 61.5 -13,5 h. 1.6 Proposed I -1.9 59 63 4.5 63.5 R - /," 59 62,5 64 forming by rolling and also thermomechanical processing of the ring, characterized in that, in order to increase the durability of NIKOV bearings, by creating a reinforced layer on the working surface of their rings, when preformed, the groove is obtained with a profile formed by two conical surfaces, symmetrical with respect to the plane of symmetry the ring is perpendicular to its axis, the angle between the generators of which and the axis of the ring blank is equal to the contact angle, 2. Method pop, 1, o. i'm liking u and the fact that the pre-shaping makes the groove of the ring blank in the plane of symmetry equal to drcosP. . 2-cosp - the depth of the pre-formed gutter, mm; p is the angle of inclination of the generators of the preliminary gutter; coefficient equal to O, 08, .. O, 12; diameter of the ball, ball bearing, mm, 3, the Method according to PP, 1 and 2, about t l and y y and and the fact that the chute zagde  (: R to d. h a The 35 rings of the ring are pre-formed by turning. 1.5, 0.8 0, E 0.4 1.3 1.9 J, 5 0.2 0.4 63 I, J), 6 1.2 0.1 0.3 four . 1.2 59 63.5 64.563.51.5 2.0 1.6 0.50.6 S ".3.2 59 62 63,562.51.0 1.4 1.0 0.10.2 Table continuation Vuz.1 9ig.2 Compiled by V. Beschekov Editor S. Lisin Tehred N. Glushchenko Corrector O, Lugov 959/9 Circulation 583 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4