SU733950A1 - Method of assembling an undetachable joint of the shaft and sleeve type - Google Patents

Description

The invention relates to mechanical assembly work, in particular to methods for assembling a one-piece connection of shaft-hub-type parts, -c

The known method of assembly is a one-piece connection of parts such as a shaft bush, which consists in that at the ends of the male part, constricted to its opening, flow grooves are made | Qi, the hollow male part is inserted into the hole and drawn from the inside with wall thinning and filling metal forming them with this burt parts 1.

However, in the known method they are used as male parts of the sleeve, in which, from the inside, there are end seams (technological allowance). 20 After pressing in the sleeve in the opening: the case of the case, the protrusions are installed on the same level with the grooves of the other part of the case. When calibrating the sleeve wall at the initial moment, they distribute 25

the upper part of the sleeve to the formation of outer tails. At this point, the dispensing force does not reach. It exceeds the repressive force of the sleeve. In the process of wall calibration, several jQ

The strength of the joint f increases, however, the deforming force must be less than the sum of the efforts of pressing out the sleeve and cutting its collar. Therefore, for calibration, a slight allowance is recommended. For diameters of 30-50 mm, it cannot exceed 0.09-0.15 mm. It is precisely this that explains the impossibility of obtaining significant thickenings when using sleeves without shoulders. The known method does not provide for the assembly of bushings installed with a gap in the opening of the housing, and without technological allowances for the formation of bursa

The aim of the invention is to increase the strength of the joint.

This goal is achieved due to the fact that in the process of pulling on the male part from the side of the free end, it is influenced by the backpressure, the value of which is 1.1-1.2 of the maximum pulling force.

The proposed method allows to obtain a strong connection of parts both with free installation of bushings (with a gap) and installation with tension. Permanent connection possible

receive both from sleeves without end thickenings, and from sleeves with thickenings. In both cases, piles are formed in the grooves of the housing.

FIG. 1-3 illustrate the invention. At the ends of the female part 1, for example the housing, concentric with the hole, the grooves 2 are preliminarily made. A hollow male part 3, for example a sleeve, is installed in the hole, and it is supported by the support 4, exposing the ends of the sleeve and the housing in one plane. A punch 5 with a dori is inserted into the bore of the sleeve and starts to move it axially.

At the initial moment of deformation, the mandrel distributes the end part of the sleeve 3. Before forming the end collar 6 with filling the groove 2 in the upper part of the metal body part 1 1, this moment the force of the backwater 4 is 1.1-1.2 of the greatest pulling force, i.e. . at the time of forming the collar b. With further movement of the punch 5 roadway thinning the wall of the part-sleeve in section 7 consistently from one end to the opposite. Thinning the sleeve wall leads to an increase in its length, no3TOiviy on the undeformed (lower) end of the sleeve permanently acts the force of the backwater 4. This force prevents the sleeve from moving relative to the housing on the surface of their contact 8. At the end of thinning the sleeve forms an end collar filling the groove 2 on the opposite end of the body with metal.

The resulting deformation of the joint of parts has considerable strength due to the formation of two end shoulders 6 at opposite ends of the deformed sleeve. Both solid metal and rolled from a sheet sleeve can serve as blanks for a part of the sleeve. .

Materials are selected depending on the purpose of the products and the conditions of their work. However, in the proposed method of combining the details, the parts may be made of both colored and black materials.

An example. Tests: they were carried out on a hydraulic press of 100 tons in a stamp with a spring buffer. As a body part, a steel bar 10 with an inner diameter of 21 mm and a hub height of 18 NOT was used. The bushing of bronze Br, OTsS 4-4-2.5 (wall thickness 2 mm and height 12 mm) was folded as a detail-bushing. The outer diameter of the sleeves ensured the easy-fit fit of the sleeve into the pinion hole. The deformation was carried out with a stepped punch Sa for one stroke of the slide ip e c s a. D and Ametr KA and Bruknets Go on sk a

The punch-punch was equal to 20.075 mm, the angle of inclination of the output part to the axis was 9. The force of the backwater in all cases did not exceed 500 kgf, which was 1, .1-1.2 of the greatest deformation force (during the formation of the collar). The total deformation force was 450 kg.

The obtained samples had good joint quality and high accuracy of the hole geometry. The deviations of the diameter of the inner hole of the joint were within the tolerance. 02-3 Running the resulting joint with the reference gear showed that basing the gear on the tooth when connecting it to the liner ensures a satisfactory accuracy of the resulting hole relative to the pitch circle.

The manufacture of products offered by the “lm method provides in comparison with the existing the following advantages:

- ensuring the strength of the joint due to the formation of double-sided shoulders on the end surfaces of the hub-sleeve (for example, when the bearing assemblies are manufactured in this way, the latter can perceive double-sided axial forces);

-improve the quality of products by ensuring the reliability of the connection parts in the process of deformation of the sleeve;

-reduction of material consumption per product by 20-30% and an increase in productivity by 2 times as compared with. press, assembly method

by eliminating the machining of the inner surface of the sleeve after assembly.

The implementation of the proposed method involves an annual savings in the frame of 4-5 thousand rubles ..,

Claims (1)

1. Novikov M, P, The basis of the assembly technology of machines and mechanisms, M., 196-2, s / 318-319, FIG. 258 (b).