Method recovery compounds with tightness

 

(57) Abstract:

Usage: in mechanical engineering at restoration connection with tightness details of type shaft-Bush". The essence of the invention: on the mating surface of one of the connected parts form the tabs with inserts that are installed with an interference fit into pre-made holes. Then protruding from the surface holes of the handle inserts from the condition of maximum tension between the respective surfaces of the projections and the second joined part. Then between the parts to form an Assembly gap, match them and make a selection of the gap. The axis of the holes for the inserts and the longitudinal axis of the joined parts can be in the same or intersecting planes. Insert and connect the parts can be made of materials with different coefficient of linear expansion. The inserts can be made with the hardness of the protruding surfaces exceeding the hardness of the mating surfaces of the parts, and also with grooves or recesses on the protruding end surface. 7 C. p. F.-ly, 6 ill.

The invention relates to mechanical engineering, in particular to restore the connection with tension-type shaft-Bush", and can the current ability of compounds with tightness, consisting in the increase of the outer diameter of the shaft or the reduction of the internal diameter of the sleeve through the creation of flows of material. This process is carried out by extrusion of the material of the workpiece at the elastic-plastic contact of the indenter material. The distribution of flows along the length of the Seating surfaces due to changes in dimensions of the parts leads to a decrease in the effective surface of the touch and does not significantly change the load capacity of the connection [1]

The closest technical solution to the proposed method recovery compounds with tightness is a process involving the execution of projections and depressions on the surface of one of the mating parts [2] Using this method of connection at the same time the tabs on the solid parts that are embedded in the mating surface with less hardness, and recesses that are filled by moving more plastic material, improves the reliability of connection with tension. However, when restoring connections with tightness formation of projections and depressions of small size (up to 2xmm) reduces the dignity of the way. Plastic material does not fill the toroidal cavities and protrusions small cross-the cross of the second invention is directed, is the restoration of the load capacity of the connection tightness after disassembly.

The proposed method recovery compounds with tightness, including the implementation of the protrusions on the mating surface of one of the joined parts, Assembly education gap between the joined surfaces, mate them, and subsequent sampling of the specified gap, characterized in that the protrusions are formed inserts that are installed with an interference fit in holes formed in the mating parts, with the subsequent handling of the protruding surfaces with the formation of the maximum interference fit between the surfaces of the protrusions and mating with them surface. The axis of the holes for the inserts and the axis of the mating parts can be located in the same plane or intersecting planes. The inserts can be made from a material with a coefficient of linear expansion different from the coefficient of linear expansion of the material of the mating parts, and with the hardness of the protruding surfaces exceeding the hardness of the mating surfaces of the part. On the protruding surface of the inserts can be made grooves or recesses.

In Fig. 1 shows the connection details of type shaft-bushing" c vstavanie details of type shaft-bushing" c insets covering the items after recovery; in Fig. 4 and 5, grooves and recesses on the protruding surface of the insert, respectively; Fig. 6 cross section of a sleeve with inserts, the axes of which are arranged in intersecting planes.

For the formation of protrusions on the details of the type of shaft 1 (see Fig.1 and 2) parts are holes in which the interference fit set of insert 2, then spend processing surfaces 3 inserts protruding beyond the outer surface of the shaft, in size, providing maximum interference fit with the mating surface of the sleeve 4.

For the formation of protrusions on the details of the type "sleeve" 4 (see Fig.3) it performs holes, in which the interference fit set of insert 2, then spend processing surfaces 5 inserts protruding beyond the inner surface of the sleeve, size, providing maximum interference fit with the mating surface of the shaft 1.

The position of the axes of the holes of the insert 2 with respect to the axes of the mating parts results in the form of a protruding part of the insert and the location of its greatest transverse dimension relative to the axis of the parts (see Fig.2, 3 and 6).

On the protruding parts of the inserts 2 may be grooves 6 with constant and variable depth and step, parallel, perpendicular army in cross section (see Fig.4 and 5).

Connection with tightness carry out thermal deformation of parts, and when placing inserts into parts like "shaft" heat sleeve, and when placing inserts into parts like "Bush "cool the shaft. Initial contacts connected in the process of heat Assembly of components on the exposed surfaces of the inserts. As a result, large contact pressure protrusions deform the material of the mating surfaces, while the material is moved into the grooves or recesses of the inserts. The coupling parts on the base surfaces of added compounds on the contour surfaces of the inserts and the surfaces of the grooves or recesses. When the load of the connection paths of the inserts and the material of the mating surfaces in the grooves or depressions perceive shifting efforts. The position of the axes of the inserts, you can change the serving area of the surface of the inserts are oriented with the largest transverse dimension of the contour of the projections in a direction perpendicular to the attached external load. In addition, increasing the load capacity of reducible compounds contributes to the increased hardness of the contour of the protruding surface of the inserts.

The linear coefficient RA is lei allows you to connect, able to change the bearing capacity under operating conditions. For example, when inserts are made of steel with a coefficient of linear expansion greater than that of the mating parts (for example, the material of the inserts 12X18H10T, bushings and shaft steel 45) with increasing temperature, the linear sizes of inserts increase, creating more contact between the mating surfaces, which increases the load capacity of the connection and the dynamic characteristics of the product. Proposed technical solutions to restore connections with tightness helps to restore the carrying capacity of the connection, and in conditions of high temperature working environment to increase its 1.3 1.7 times.

1. Method recovery compounds with tightness, including the implementation of the protrusions on the mating surface of one of the joined parts, Assembly education gap between the joined surfaces, mate them, and subsequent sampling of the specified gap, characterized in that the protrusions on the mating surfaces form with inserts that fits establish in previously executed on said mating surface of the hole, then vystupayuscheykromki surfaces of the protrusions and the second joined part.

2. The method according to p. 1, characterized in that the axis of each hole for inserts placed in the same plane with the longitudinal axis of the mating parts.

3. The method according to p. 1, characterized in that the axis of the holes for the inserts and the longitudinal axis of the mating parts have in intersecting planes.

4. The method according to any of paragraphs.1 to 3, characterized in that use inserts of a material with a coefficient of linear expansion different from the coefficient of linear expansion of the materials connected details.

5. The method according to any of paragraphs.1 to 4, characterized in that use inserts with a hardness of surfaces projecting from the designed for insertions holes of one of the joined parts greater than the hardness of the mating surface of the second joined part.

6. The method according to any of paragraphs.1 to 5, characterized in that use inserts located on their protruding end surface grooves.

7. The method according to any of paragraphs.1 to 5, characterized in that use inserts with indentations, located on their protruding end surface.

8. The method according to p. 8, characterized in that use inserts with recesses having tapered section forms the

 

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SUBSTANCE: method comprises steps of separately making metallic convex bottoms with cylindrical collar and backing ring. Thermal expansion factor of backing ring exceeds that of bottoms; outer diameter of backing ring provides close fit of bottoms onto it at 20°C; cooling preliminarily assembled backing ring with bottoms until cryogenic temperature; sliding bottoms on backing ring in cooled state until mutual touch of cylindrical collars of bottoms; heating assembly up to 20°C in order to provide close fit of backing ring in cylindrical collars of bottoms; welding bottoms along butt of assembly and then removing backing ring by chemical milling.

EFFECT: simplified process of making envelopes with enhanced mass characteristics.

2 cl, 4 dwg, 1 ex

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