The method of joining parts with tension

 

(57) Abstract:

The invention relates to mechanical engineering and can be used in connection with tightness details type shaft sleeve. On the mating surfaces covered in detail by the method of plastic deformation perform cavity and the perimeter of the depressions, the projections of the ring shape. For this purpose, the tool including a separator with a rolling element and a movable element with a support surface, concentric mating surfaces covered in detail. The separator tell rotational motion, and rolling element radial movement. During execution of the cavities limit the depth of the annular stop face surface. The specified surface at the end of the deformation process is introduced into contact with the surface covered in detail. Then between the mating parts to form an Assembly gap, the parts connect to each other and produce a clearance. The result is increase the load capacity of the compounds obtained. 4 Il.

The invention relates to mechanical engineering, in particular, to compounds with tightness details type shaft sleeve, and can be used when creating Nadie relief in the form of projections and depressions, moreover, the protrusions in the form of cones, and hollows in the form of covering the base of the cones and smoothly connected with them truncated tori, the volumes are equal to the volumes of cones (see, for example, USSR author's certificate N 1199558, CL 23 P 11/02, 1985).

Using this connection method simultaneously protrusions that are embedded in one surface, and recesses that are filled with a material that 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. Plastic material does not fill completely toroidal cavity due to the small transverse size, and the cone shaped protrusions stresses beyond the yield strength of the material, which reduces the load capacity of the connection under cyclic loads.

The closest in technical essence to the invention is a method of joining parts with tension, including performing on the mating surface of one of the connected details of the depressions and protrusions on the perimeters of the cavities by the method of plastic deformation of the rolling elements installed in the separator (see patent N 2096157, CL 23 P 11/02, 1997). Place surface of the moving element of the instrument. The method allows to increase the area of the surfaces of the formed cavities, the length parameters of the projections and to increase the carrying capacity of the connection. However, with increasing transverse dimensions ellipsometry depressions, moving the plastic material occurs in depressions in the areas of the projections. This leads to a decrease in the "clutch" covering, and covered the surfaces of the parts in the middle zone of the recesses, the decrease in the contact area, and this, in turn, reduces the bearing capacity of the connection. The challenge which seeks the invention is to increase the load capacity of the connection is covered and covering parts with tension.

To solve the problem in a well known method of joining parts with tension, including performing on the mating surface of one of the joined parts of the valleys and along the perimeter of the cavities of the projections, the education between the mating parts of an Assembly gap, the coupling parts and the subsequent selection of a specified gap, with depressions and projections performed by the method of plastic deformation of the tool containing the cage with rolling elements and the movable element with a support surface, inter the of their mating surfaces of the parts, depressions and protrusions perform an annular shape on the mating surfaces covered in detail why the cage with rolling elements reported rotational motion and use the tool with a movable element having a support surface, concentric mating surfaces covered details that tell the radial displacement and the depth of the depressions in the process of implementation limited by an annular stop face surface, which is injected at the end of the deformation process in contact with the surface covered items.

The invention is illustrated graphics, where Fig. 1 shows a longitudinal section of a tool for performing circular depressions on the covered surface of a part of Fig. 2 is a fragment of the cross-section of connection with tension; Fig. 3 and 4 - layout of the annular grooves is deployed covered the surfaces of the parts: longitudinal, chess.

When performing circular depressions to the Seating surfaces are covered in detail is supplied separator 1 with the rolling elements 2, the rolling element 3 report of the radial displacement. Bearing surface 4 of the rolling element 3 by the force P presses the rolling elements 2 in poverhnosnyh pressure on the rolling elements and move them to the separator on the surface of the part 5 is formed in trench 7, when this material under surface of the rolling element is sealed, and due to the action of shearing forces is shifted to the periphery of the circular cavity, forming annular projections 8 and 9 on the inner and outer circumference of the basin. The depth of deformation of the depressions is fixed annular stop 10. The orientation of the annular depressions and protrusions on the surface covered by the workpiece relative to the tool provides a corresponding rotation of the workpiece about its axis and moving in the direction perpendicular to the axis (see, for example, Fig. 3 and 4).

The connection tightness (see Fig. 2) carry out thermal deformation of parts. The initial contacting of the connected parts during the Assembly process occurs protruding above the landing surface of the circular paths formed by the protrusions 8 and 9. The protrusions deform the material covering the surface, due to the tension of the material covering the surface moves in the annular recess.

Execution of depressions in the form of annular grooves optimizes the width of the depressions and create stress state across the entire width of the recesses and protrusions on the perimeter of the inner circumferences of the annular recesses provide additional soedineniya. In addition, the annular recesses provide a more rational arrangement of the support surfaces when planting with tension, that is, contribute a smaller deformation distortions, the outer surfaces of the covering part 11 due to the grooves on covered items 7.1

The method of joining parts with tension, including performing on the mating surface of one of the joined parts of the valleys and along the perimeter of the cavities of the projections, the education between the mating parts of an Assembly gap, the coupling parts and the subsequent selection of a specified gap, with depressions and projections performed by the method of plastic deformation of the tool containing the cage with rolling elements and the movable element with a support surface that interacts with the movement of the rolling element rolling bodies to ensure plastic deformation of their mating surfaces of the workpiece, characterized in that the depressions and protrusions perform an annular shape on the mating surfaces covered parts why the cage with rolling elements reported rotational motion and use the tool with a movable element having a support surface, concentric mating on top of the Oia limited by an annular stop face surface, which is injected at the end of the deformation process in contact with the surface covered in detail.

 

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

2 cl, 4 dwg, 1 ex

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