The way the fixed connection details

 

(57) Abstract:

Usage: when machining the work to get fixed connection details type shaft sleeve. The essence of the invention: on the mating surface of one of the connected details place of core elements, which are oriented along the axis of the joined parts and fixed in this position. Then assemble the parts by pressing, which provide the implementation of the core elements in the body of the two joined parts. To improve the accuracy of centering of the shaft and sleeve use an even number of beam elements, and the elements of each pair are placed diametrically opposite relative to the axis of the joined parts. Orientation and fixation is carried out, for example, by fixing rod elements in the holes or slots of the washer, which is established on the face of one of the joined parts. 2 C.p. f-crystals, 6 ill.

The invention relates to the field of mechanical works, in particular to methods fixed connection details type shaft sleeve.

There is a method in which the shafts put rifle in the form of longitudinal ridges of triangular cross-section with outwardly the material predetermined sleeve and forms a fixed connection. The hardness of the material of the sleeve should be at 10.15 units HRCeless than the material hardness of the shaft [1] which is not always feasible. In addition, you must perform a special operation on rolling flute on the shaft.

A method of obtaining a fixed connection details type shaft sleeve by pressing, including placing on the mating surface of one of the connected details of the core elements of form, orientation along the axis of the joined parts, fixing in position and the subsequent Assembly of the parts by pressing [2]

Technical problem on which the invention is directed, is to increase the strength and processability of the obtained compound.

The problem is solved in that in the known method of obtaining a fixed connection details type shaft sleeve by pressing, including placing on the mating surface of one of the connected details of the core elements of form, orientation along the axis of the joined parts, fixing in position and the subsequent Assembly of the parts by pressing, in the process of pressing establish core elements form the body of the two joined parts.

In addition, csino, i.e. having pairs against one another.

Orientation and fixation of the core elements of the form can be made by fixing them in the holes or slots of the washer, which is established on the face of one of the joined parts facing surfaces to the other parts.

As core elements of the form you can use wires with different cross-sectional shape and has a hardness of at 5.15 units HRCemore than the materials of the joined parts. The details can connect with gap and tension. In the first case, the transverse size of the core elements of the form must be larger than the size of the clearance between the shaft and the sleeve.

In Fig. 1 and 2 show, respectively, the sleeve and the shaft, connected surfaces which established the core elements of the form;

in Fig. 3 and 4 variants of the process of pressing, with the application of force fitting to the shaft or sleeve;

in Fig. 5 and 6, the area of contact details embedded in their body core elements, the cross section of which has a different shape, for example, circular and lozenge.

The method is as follows.

When connecting sleeve 1 and VA is 3. One way of fixing is to consolidate the core elements of the form 3 in the holes or slits of the washers 4 and 5, which are mounted on the end surface of the shaft or sleeve facing surfaces for mating parts. In the pressing process carried out in the Annex to one of the components of the force P3the core elements of the form are placed in the body of the shaft and sleeve.

The number of cells, their shape, transverse size, material and hardness depends on the type of landing the shaft into the sleeve (with a clearance or preload), sizes and materials connected details, the required accuracy of centering of the transmitted and the load connection. Due to the influence of many factors, parameters related to the core elements of the form, you should pick up an experimental way.

Thus, in the process perform the following steps:

1. The core elements of the form 3 are fixed in slots or holes of the washers 4 or 5.

2. Washer elements mounted on the end surface of the shaft or sleeve facing surfaces to the other parts (Fig. 1 and 2). Moreover, the elements are oriented and fixed relative to the joined surface of one of the hosts in the zone of contact details by pushing in the body of the shaft, and sleeves.

4. After receiving the connection protruding ends of the elements released from the slots washers and cut, if necessary.

An example of performing the method. Implemented method for assembling the sleeve of steel 30 with an outer diameter D of 30 mm and a solid shaft made of bronze Br. AG with a bore size 20 mm connection Length l of 20 mm Fit of shaft and bushing was carried out with the gap S 0,10,02 mm and tightness N 0,040,01 mm core Elements of the form were made from wire steel (70), a much more solid (HB 300) than the materials being joined parts having a circular cross section with d1=1 mm. the Elements of wire oriented and fixed relative to the joined surface of the shaft with the washer 5 (Fig. 2). The number of elements 4, they are located opposite (Fig. 6). The pressing was carried out according to the scheme shown in Fig. 4. After Assembly, the compounds were tested for axial shifting and twisting with the fixation of the initial efforts of the relative shift of the details. The results are presented in the table.

Thus, both axial and especially circular strength of the connection with tightness, collected with the core elements, placed in the zone of contact details before the Ala and sleeve Assembly with a gap), their power circuit through intermediate elements according to the proposed method makes it possible to obtain circular strength corresponding to the strength of the connection tightness N 40 microns. This connection can also work for the axial shift. In addition to getting a strong enough connection, the application of the proposed method gives the following advantages over known: reduced requirements to the quality of the mating surfaces, no need for additional process steps for the manufacture of grooves for placement of elements, the elements themselves or rolling flute.

Implementation of the proposed method is simple, it is possible in any enterprise for the production of goods and renovations.

Sources of information

1. Romanov, M. I. And others, a Collection of problems on the machine parts: a Training manual. -M Engineering, 1984. -240 C.

2. Orlov P. I. design principles. Reference textbook in 3 books. KN.1. Ed. 2nd, Rev. And supplementary) engineering, 1977.

1. A method of obtaining a fixed connection details type shaft sleeve by pressing, including placing on the mating surface of one of the joined parts alemow the Assembly of parts by pressing, characterized in that in the process of pressing establish core elements form the body of the two joined parts.

2. The method according to p. 1, characterized in that use an even number of elements, a rod shape, and the elements of each pair are placed diametrically opposite relative to the axis of the joined parts.

3. The method according to p. 1, characterized in that the orientation and fixation of the core elements of the form produced by fixing them in the hole or slot of the washer, which is established on the face of one of the joined parts facing surfaces to the other parts.

 

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2 cl, 4 dwg, 1 ex

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