SU1581555A1 - Method of producing fixed joint of female and male parts - Google Patents

Abstract

The invention relates to machine-assembly production, in particular to methods for joining parts (D) with tension. The purpose of the invention is to improve the quality of the assembly of joints by increasing its strength due to better adhesion of the mating surfaces. The covered D is made with an inner hole and from a material having a hardness of at least 140 ... 160 Brinell units less than the hardness of the material covering D. A partially regular concave microrelief is applied to the inside surface of the opening D, and on the outside surface covered by a fully D-regular microrelief of convex shape. The height of the irregularities on the surfaces is 50 ... 300 microns, and their radii are 200 ... 1500 microns. After assembling D, boring of the hole covered by D. 3 ill.

Description

The invention relates to machine assembly, in particular to methods for joining parts with a tension. The purpose of the invention is to improve the quality of the assembly of joints by increasing the strength of the joint by improving the adhesion of the mating surfaces

Fig. 01 is a schematic representation of a covered part with a completely regular micro-relief of a convex shape on the outer surface; Fig. 2 shows a female part with a partially regular micro-relief of a concave shape on the inner surface; on fig - the contact surface of the fixed joint o

The method of fixed connection of parts is carried out as follows.

On the inner surface of the female part 1, for example, by means of vibro-rolling, a partially-regular micro-relief 2 with irregularities of the concave shape. On the outer surface of the male part 3, a completely regular micro-relief 4 of convex shape is made in the same way. The height of irregularities is 50-300 microns, and their curvature radii are 200-1500 microns. The material of the part 3 is chosen with a hardness of not less than 140-lbO Brinell units less than the hardness of the material of the female part 1, and the part 3 is made with an internal bore.

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Then connect the parts ,. If they are made with a gap, then one part is inserted into another without any effort. It is possible to connect them by thermal assembly, mte by heating one part and cooling another, or changing the temperature of one part, depending on the amount of tension. ha After that, the assembled joint is primed over the surface of the hole of the male part, which leads to plastic deformation of the latter in the radial direction “

The presence of a mikrel of a concave shape on one surface and a convex one on another surface allows, during doring, to engage in a sinusoidal engagement,. The part of the fully regular microrelief that did not enter the hollows of the concave partially regular microrelief is deformed during burnishing, which leads to a decrease. irregularities in height and increase in radii, and, consequently, increase the contact area of the mating surfaces, which increases the strength of the joint

Examples The covering part 1 is made of steel 45 and a partially regular microrelief 2 is applied on its inner surface, obtained with the following mode of vibro-rolling, the radius of the deforming element 3.5 mm, the number of double strokes 1400 1 / min; feed 2.4 mm / rev; eccentricity 2 mm; the rotational speed of the workpiece is 4.8 rad / s; force of pressing the deforming element into the surface being machined 400 H0. As a result, the following geometrical parameters of the partially regular microrelief were obtained, µm: the width of asperities 700 j, the depth of asperities 90; relative area occupied by regular irregularities, 35%

On the covered item 3, obtained by bending sheet bronze

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blanks DRIM 2, Br OCS 4-4- 2.5, was applied fully regular microrelief 4 of a convex shape, so de vibro-roll with a bending roll. The following microrelief parameters were obtained, μm: the height of irregularities 300; their radius of rounding is 1480. Then they joined the parts and made molding. holes covered about i,

Thus, measurements of the compression force of the obtained compound showed that its strength increased by more than 3 times as compared with the compound in which the mating surfaces were machined by turning willows 1.7 times as compared with the compound obtained without welding. with microrelief parameters beyond the limits specified in the method

Claims (1)

Invention Formula The method of obtaining a fixed connection of the male and female parts, consisting in applying a microrelief on the mating surfaces of both parts and their subsequent combination, characterized in that, in order to improve the quality of the assembly of the compounds, the male part is made with hardness, not less than 140-160 Brinell units less than the hardness of the material covering, the microrelief on the surface of the latter is performed partially regular with a concave shape of irregularities, and on the surface of the covered, completely regular with a convex shape of irregularities, and these irregularities are made with a height of 50 to 300 microns, and with a radius of rounding of 200 to 1500 microns, and after connecting parts Ftl U /, / 7 t J FIG. 2 2 L Fig.Z