Way to connect with tightness details type shaft sleeve

 

(57) Abstract:

Usage: in mechanical engineering in the creation and restoration of immovable joints type shaft sleeve. The inventive connection for the use of components with different hardness of the mating surfaces. Method of plastic deformation of the tool on the mating surfaces of the extreme hardness perform depression ellipsometry forms and projections on the perimeter of a variable height. As a tool they use established in the separator body rolling and interact with the surface of the movable element. Plastic deformation is produced by radial movement of the rolling bodies, carried out by axial movement affecting them rolling element, which may be communicated to the ultrasonic vibration, the direction of which coincides with the direction of movement. 2 C.p. f-crystals, 6 ill.

The invention relates to mechanical engineering, in particular, to compounds with tightness details type shaft sleeve, and can be used in the establishment and restoration of immovable joints.

A known method of connecting to the tightness of parts with different hardness. On items with solid over Ernest less solid parts [1]

There is a method of joining parts with different plasticity, in which the connection is formed by moving more plastic material of the same part in the groove part of the less ductile material [2]

A known method of connecting to the tightness of the parts, including the implementation of relief in the form of projections and depressions, and protrusions are in the form of cones, and hollows in the form of covering the base of the cones and smoothly mating with them truncated tori, the volumes are equal to the volumes of cones [3]

Using this connection method at the same time the tabs on the solid parts that are embedded in the surface with less hardness, and recesses that are filled by moving more plastic material, improves the reliability of connection with tension.

However, the formation of protrusions and depressions on a small area of the workpiece surface with a spot diameter of not more than 2 mm reduces the advantages of this method. Small outer diameter of the depression is equal to the area of the surfaces of the projections and depressions on the spot diameter, the relatively small surface area mates occupied by relief, does not contribute to increasing the carrying capacity of the connection. Plastic material does not fill completely troop the voltage, beyond the fluidity of a plastic material, which reduces the load capacity of the connection under cyclic loads in operation of the connection.

The closest in technical essence to the invention is a method of connecting to the tightness of parts like shaft sleeve including a preliminary run on the mating surface of one of the joined parts by means of plastic deformation of the tool projections with a hardness exceeding the hardness of the material other mating parts, and depressions, education Assembly gap between the joined parts, mate, and subsequent sampling of the specified gap [4]

During the heat treatment compounds the initial contacting of the surfaces occurs on the tops of the projections of the parts, the material which is received as a result of deformation increased physical-mechanical properties, in particular, a higher hardness than the material of another part. As a result, large contact pressure protrusions of the surface of one part deform the material of the other of the mating surfaces in the grooves between the projections. However, full implementation of the protrusions is not happening due to the fact that the grooves near the ends odniczych ledges, there is tension, beyond the fluidity of a plastic material, which reduces the amount of tension and, accordingly, the carrying capacity of the connections under cyclic loads under operational conditions.

Task to be solved by the claimed invention is directed, is to increase the load capacity of the connection is covered and covering parts with tension.

To solve the problem in a known manner in connection with tightness details type shaft sleeve including a preliminary run on the mating surface of one of the joined parts by means of plastic deformation of the tool projections with a hardness exceeding the hardness of the material other mating parts, and depressions, education Assembly gap between the joined parts, mate, and subsequent sampling of the specified gap for connection use parts of different hardness of the mating surfaces, as a tool for plastic deformation is used installed in the separator body rolling and interact with the surface of the rolling element, and subjected to plastic deformation of the workpiece surface pair higher hardness by radial the enta, resulting gain depression ellipsometry forms and projections on the perimeter of a variable height.

As the rolling elements can be used rollers and the rolling element in its axial movement reported by the ultrasonic vibration, the direction of which coincides with the direction of movement.

The invention is illustrated graphics, where Fig. 1 presents the execution scheme of relief on parts like "shaft" of Fig. 2 the execution scheme of relief on parts like "Bush", and Fig. 3, 4 and 5 relief on parts like shaft with longitudinal, transverse and angular position of the major axis of the basin relative to the axis of the piece; Fig. 6 connection with tightness and a fragment of the cross-section.

When performing relief on parts like "shaft" (see Fig. 1) on the landing surface of the shaft 1 set the separator 2 with the rolling elements 3. The tool force P with the working surface 4 of the report, the axial displacement. The diameter of the working surface of the tool in contact with the rolling elements, is less than the lateral dimension defined by the sum of the two maximum diameters of the rolling elements and the diameter of the shaft. The result of the contact pressure on the body of the roller 3 in the axial movement of the tool b is ing compacted, and due to the action of shearing forces, determined by the curvature of the Seating surface and the rolling elements, is shifted to the periphery of the depressions forming the protrusions 6 a variable height along the perimeter of the cavities. The rolling elements are in the form of rollers forming a different curvature or balls. They are placed in boxes, separators, ensuring the orientation of the rolling elements and, respectively, the relative positions of the recesses of the relief, for example, in a checkerboard pattern with longitudinal (see Fig. 3), cross (see Fig. 4) or angular (see Fig. 5) location of the major axis of the cavities relative to the axis of the piece.

When performing relief on parts like "Bush" (see Fig. 2) on the landing surface of the sleeve 7 set the separator 8 with the rolling bodies. The diameter of the working surface 10 of the tool in contact with the rolling bodies, more lateral dimension defined by the difference between the diameter of the mounting bore and two maximum diameters of the rolling elements. This ensures that the contact pressure on the rolling body in the event of axial movement of the tool and the formation of the desired relief on the Seating surface of the sleeve.

Tools 4 and 10 during the formation of the relief you can tell ultrasonic vibrations, the effect of which is liveout for one). The waveguide is rigidly fastened to the hub of the ultrasonic transducer. The use of ultrasonic vibrations in the longitudinal movement of the tool reduces the effort on the instrument when performing plastic deformation of the shaft or sleeve rolling elements, increases the hardness of the projections due to work hardening of the material when it is offset toward the periphery of the depression.

The relief on the part applied with the density at which the ratio of the total surface area occupied by the elevation to the entire Seating surface reaches of 0.35. This condition is ensured by the dimensions of the recesses with depth of deformation that does not exceed the maximum amount of tension in the connection. When the deformation of the Seating surface to a depth of tension on it are formed ellipsometry basin, and along the perimeter of the depressions are formed protrusions with a maximum height not exceeding the maximum deepening of the rolling elements.

The connection tightness (see Fig. 6) carry out thermal deformation of parts. The initial contacting of connected components during thermal Assembly occurs protruding above the landing surface contours formed by the protrusions 6 a variable height according perimetry this due to the tightness at the base surfaces of the more ductile material is moved into the recess surface with greater hardness. The coupling parts on the base surfaces of added compounds on the contours of the projections and the surfaces of the cavities within these contours. When the load of the connection paths of the projections and the material in the hollows perceive shifting efforts.

The increase of the contact surfaces on the projections, providing the possibility of moving the plastic material into the cavities by performing them with the necessary transverse dimensions, the filling material depressions located inside the tabs, can significantly increase the carrying capacity of connections with tightness details type shaft sleeve.

1. Way to connect with tightness details type shaft sleeve including a preliminary run on the mating surface of one of the joined parts by means of plastic deformation of the tool projections with a hardness exceeding the hardness of the material other mating parts, and depressions, education Assembly gap between the joined parts, mate, and subsequent sampling of the specified gap, characterized in that the compounds used parts with different hardness of the mating surfaces, as a tool for plastic deformation is used installed in the Finance subject item surface pair higher hardness by radial movement of the rolling bodies, implemented in the event of axial movement affecting them rolling element, resulting in a gain depression ellipsometry forms and projections on the perimeter of a variable height.

2. The method according to p. 1, characterized in that the rolling bodies use the rollers.

3. The method according to p. 1 or 2, characterized in that the rolling element in its axial movement reported by the ultrasonic vibration, the direction of which coincides with the direction of movement.

 

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