SU1227839A1 - Process of manufacturing spherical hinge - Google Patents

Description

t

The invention relates to mechanical engineering and can be used in the manufacture of spherical hinges used mainly in agricultural machines.

The purpose of the invention is to improve the quality of the product obtained by providing a uniform gap between the sleeve and the spherical contribution.

Fig. 1 shows details of a spherical hinge prior to their connection,; figure 2 - spherical hinge after the operation of the compression sleeve; on fig.Z - spherical hinge assembly.

The spherical hinge consists of a sleeve 1 and a spherical insert 2, the sleeve is made in the form of a sleeve of ductile steel, and the spherical insert is made finally with the necessary accuracy and surface cleanliness. In order to ensure the cranking of the insert in the sleeve, the required amount of radial clearance U is prescribed. The heating temperature t is then determined to provide a radial clearance in the joint according to the following relationship:

i

f --- l. f

103 .. d-ot o,

where d is the diameter of the liner;

Sat is the coefficient of linear expansion of the liner material; tg is the assembly temperature

The deposit 2 is heated using any known methods to a predetermined temperature t. When heated, its outer diameter increases to d + 2a, b

In the heated state, the liner is installed in the sleeve 1 and is subjected to its cold reduction, for example, by depositing in the holder on the press. The process is carried out until the surfaces of the liner and the insert come into contact and jammed.

The resulting product is subjected to cooling to operating temperature. The outer diameter of the liner at the same time

392

decreases, and a uniform radial gap is formed between it and the sleeve, since the sphere shrinks in one direction in all directions equally.

The method is carried out in the following manner.

Spherical. Hinge made with the formation of a given gap of 250 microns. The sleeve is made of steel 10, the dimensions of the workpiece: outer diameter of 64.5 mm, internal d-diameter 50 + 0.62 mm, height 36 mm. The insert is made of steel 45X having a hardness, sphere diameter d 50 MM, the purity of the outer surface R 20 microns.

The required temperature is determined by the formula

G- .. 250

lO d-ci, f That .50--12-That “

+ 2A ° С - 440 С.

With regard to cooling during transfer, the heating temperature is taken. Heating of an insert to 460 ° C is carried out by an electric furnace. The heated insert is placed in the sleeve, which is under-.

cast in the cage. Dimensions of sleeves after draft; outer diameter D mm, height 28 mm. The product obtained is subjected to air cooling. After cooling, the hinge is turned in the sleeve by tightening the sleeve in a vice and introducing the driver into the hole of the hinge. The hinge rotates easily.

The effectiveness of this method is counted in the possibility of obtaining a uniform gap in the joint, which improves the quality of the products; in the ability to control the magnitude of the gap in the compound by changing

heating temperature of the hinge; in conjunction with heat treatment and heat treatment, which reduces the cost of hinge manufacturing.

97t / e. 2

Editor A.Dvlinich

Compiled by N.Pozhidaeva

Tehred V. Kadar Proof-reader I. Erdeyi

Order 2274/36 Circulation 777 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Fig.Z

Claims (1)

'METHOD FOR MANUFACTURING A SPHERICAL HINGE, which consists in installing a spherical liner in a liner, compressing the liner on the outer surface of the spherical liner until they touch and then forming a radial clearance in the resulting joint, characterized in that, in order to improve the quality of the obtained product by ensuring uniform the gap between the liner and the spherical liner, the formation of the radial gap is carried out by heating the spherical liner before installing it in the liner to a temperature, providing Chiva increase in the diameter of the insert by an amount of twice the radial clearance and a joint cooling, the Guild crimped PS and spherical liner to ambient temperature.