Method of recovering mates enshrined in the body of the sleeve with the shaft

 

(57) Abstract:

The invention relates to the field of recovery of mating cylindrical surfaces in the repair of machine parts. The way to restore the pair is in the preliminary additional bushings, machined restored surfaces of the pair, the additional connection of the sleeve with the details mate. Additional sleeve is obtained by bending a sheet material and got the blank in the housing bore so that the end of the additional sleeve advocated previously received in the housing bore chamfer, then effect the crimping of the specified end of the chamfer of the body bore, before the application of effort to move the sleeve into the hole an extra sleeve in the bushing perform end-to-end groove, install it in a production mandrel with an interference fit with the formation jutting out from the technological frame of lead-in area, after which the sleeve is fixed by means of the lead-in area in the hole an additional sleeve. The use of the invention will expand the technological capabilities through the use of thin-walled additional sleeve. 1 C.p. f-crystals, 4 Il.

There is a method of installing bushings in covering the item with tightness, at which the application efforts to move the sleeve in covering part, a bushing installed in a production mandrel with an interference fit with the formation jutting out from the technological frame of lead-in area, after which the sleeve is fixed by means of the lead-in area in the hole covering detail /1/.

The possibility of using the known method is limited to the allowable amount of decrease (1.2%) of the initial diameter of the sleeve /1/.

There is a method of connection of the casing and covered parts, which covered the item is produced by bending a sheet material and got the blank in the housing bore so that the end of a covered part played for existing or previously received in the housing bore chamfer, then provide ambitiouse the specified end of the chamfered openings /2/.

The possibility of using this method is limited by the scope of the recovery stationary press-fit connection details type shaft-housing /2/.

The closest in technical essence is a way to restore mates enshrined in the building is being restored surfaces mate, the additional connection of the sleeve with details of the pairing /3/.

In the known method, an additional sleeve zapressovyvajutsja into the main sleeve or shaft. Based on the technological capabilities of the minimum thickness of the additional sleeve shall not be less than 2 - 2.5 mm, thus reducing the diameter of the shaft journal or the thickness of the main sleeve, which makes it impossible to use this method in the repair of such parts are not allowed to significantly reduce the strength /3/.

Object of the invention is the expansion of renewable mates through the use of thin-walled additional sleeve without significant reduction in strength of the recovered items.

The problem is solved due to the fact that in the method of recovering mates enshrined in the body of the sleeve with the shaft, is to first obtain an additional sleeve, mechanical processing of the recovered surfaces mating connections additional sleeve with details of the coupling according to the invention an additional sleeve is produced from a sheet material by a flexible cylinder and got the blank in the housing bore so that the thief are ambitiouse the specified end of the chamfer of the body bore, before application of effort to move the sleeve in the hole for more bushings in the bushing perform end-to-end groove, install it in a production mandrel with an interference fit with the formation jutting out from the technological help lead-in area, after which the sleeve is fixed by means of the lead-in area in the additional hole of the sleeve, while the width of the through groove in the sleeve is determined by the formula b = 2(t-),

where t is the thickness of the sheet material additional sleeve, a specified interference fit of the bushing in the housing.

Furthermore, the method differs in that the thickness of the sheet material additional sleeve is determined by the formula t = t1+ t2where t1- minimum thickness, defined as the sum of the machining tolerances of the body, sleeve and shaft, t2- allowance to bring the minimum thickness of sheet material to a standard or specified.

In Fig. 1 shows the connection of the parts immediately after the installation of an additional sleeve in the housing, a longitudinal section; Fig. 2 shows the connection details after flanging the end of the additional sleeve in the facet of the body bore, a longitudinal section; Fig. 3 is a transverse section of the sleeve after it is executed in n odnogo section of the bushing in the hole of an additional sleeve, longitudinal section.

The method is as follows.

Additional sleeve 1 is performed by bending a sheet material into a cylinder with an outer diameter D that is equal to the nominal value of inner diameter D of the housing 2. The thickness t of sheet material is determined by the formula t = t1+ t2where t1- minimum thickness, defined as the sum of the machining tolerances of the housing 2, the sleeve 3 and the shaft 4. The amount of allowances is determined depending on the degree of wear and the given geometrical parameters of the working surfaces of these parts; t2- allowance to bring the calculated minimum thickness of sheet material to a standard or specified.

The resulting piece sleeve 1 is installed in the housing bore 2 so that the end 5 of the sleeve 1 played for existing or previously received in the housing bore 2 edge chamfer 6 on the h value, which is determined from the relation h = (0,9 - 2,2)t, where t is the thickness of the sheet material additional sleeve 1.

Then carry out the flared end 5 of the sleeve 1 in the facet 6 of the valve housing 2.

Before pressing sleeve 3 in t - the thickness of the sheet material additional sleeve 1; - set the tightness of the sleeve 3 in the housing 2.

After that, the sleeve 3, having an initial outer diameter D, is compressed in the process mandrel 8 to the outer diameter D1equal to the nominal diameter of the additional sleeve 1. As technological mandrel 8 may be used, for example, the Chuck, jam Chuck or clamp. Moreover, the sleeve 3 is installed in the process frame 8 with the formation of the lead-in section 9, by which the sleeve 3 is fixed in the hole of the additional sleeve 1.

Then carry out the injection sleeve 3 in the additional hole sleeve 1. When the flared end 5 of the sleeve 1 prevents it from moving in the housing 2 at the time of pressing sleeve 3. Executed by the above formula, the width "b" of the through groove 7 provides the initial reduction of the outer diameter D of the sleeve 3 to a size equal to the sum of the internal diameter D1dopolnitelnoi sleeve 1 and the specified nataga sleeve 3 in the housing 2. At the same time decreases the initial inner diameter d of the sleeve 3 to the specified dimension d1.

Sources of information:

3. Klebanov B. C. Repair of motor vehicles and tractors. H I - M: motor cycle", 1961, S. 112.

1. Method of recovering mates enshrined in the body of the sleeve with the shaft, including a preliminary additional bushings, mechanical processing of the recovered surfaces of the pair, the additional connection of the sleeve with the details mate, characterized in that the additional sleeve is produced from a sheet of flexible material it into a cylinder in the housing bore performing chamfer establish said additional sleeve in the housing bore with the formation of the protruding beyond the cutting edge chamfer end, are flared protruding end of the additional sleeve on the facet of the body bore, the bushing perform end-to-end groove, install it in a production mandrel with an interference fit and with the formation jutting out from her lead-in area, which are pressed into the hole an additional sleeve, while the width of the through groove of the sleeve is determined by the formula b = 2(t-), where t is the thickness of the sheet material additional sleeve, a specified interference fit of the bushing in the housing.

2. The method according to p. 1, characterized in that the thickness of the sheet material additional sleeve is determined by the formula t = t1+ t2- allowance to bring the minimum thickness of sheet material to a standard or specified.

 

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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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