Method for manufacturing anti-friction layer of sleeve half-bearing

FIELD: machine building.

SUBSTANCE: method for manufacturing anti-friction layer of sleeve half-bearing consists in oversized boring after sleeve casting and its plastic deformation. Plastic deformation is made within the range of recrystallisation temperature of matrix alloy phase, but not exceeding the temperature of melting of disperse phases at average speed of deformation 10-2≤ε≤10 s-1. Deformation is made in several transitions with changing of direction by transitions to opposite one. Deformation is done by tool, the material, thermal processing and roughness of which corresponds to the material of shaft neck joined with the bearing.

EFFECT: increase of product wear-resistance due to creation of small grain structure of top layer, provision of positive gradient of mechanical properties by depth, reduction of surface roughness due to smoothing microroughnesses by breaking-in roller and reduction of material wearing-in period.

3 cl, 1 tbl, 1 ex

 

The invention relates to the processing of metals by pressure, in particular to the creation of a surface layer with anti-friction properties on metal parts such as bodies of rotation by rolling, burnishing, burnishing or vibrating processing, and can be used for the manufacture and repair of shell bearings of steam turbines.

Known technology for producing shell bearings by free fill consists in preparing the bearing housing internal cavity, metal pouring, shutter speed, and machining of the liner [Chernavsky S.A. Bearings. M: motor cycle", 1963, 244 S.].

The known method [Przybylski Century Technology surface plastic processing. TRANS. with Polish., M.: metallurgy, 1991, S. 479] the manufacture of anti-friction layer, in particular made of white metal, bearings, including the manufacture of the body, the underlayer coating of tin, pouring molten Babbitt in the appropriate form, machining and subsequent Sabrina or boring to specified dimensions.

Such methods do not provide sufficient durability babbit layer due to the coarse roughness of the working surface of the liner (Ra 0,10-0,12 µm) and defects in the cast structure, such as a coarse-grained structure, porosity, uneven distribution of the phases of the other

The known method [AC USSR №834159, CL C21D 7/10, 1981] surface hardening of metal products by repeated surface deformation in different directions, namely, that with the purpose of increasing the degree of hardening of the surface layer with simultaneous loss of strength and increase the ductility of the inner layers of metal deformation force, differentiated by aisles on the smaller size and sent for each subsequent passage perpendicular to the previous change point of application of force on each pass.

The disadvantage of this method is that the set of technological operations (operation drawing, differentiation efforts to aisles on the smaller magnitude and direction of effort on each subsequent pass perpendicular to the previous change point of application of force on each pass) does not allow to include it in the technology of manufacturing of bearings.

The known method [Anatychuk, Vperiod, Wmmaiload, Wedmore. Analysis of the deformability of metals in surface hardening of parts. "Forging and stamping production", 1993, No. 10, p.10-13] plastic deformation of the surface, including mnogovershinnoe alternating non-monotonic plastic deformation carried out at room tempera is ur.

The disadvantage of this method is that the plastic deformation is carried out probiodrug way by ball indentation.

Closest to the present invention is a method [AC USSR №209923, CL F16C 33/12, 1968] the manufacture of shell bearings, which consists in the fact that in order to improve the wear resistance of the anti-friction layer rastaivaya with an allowance, and then heated to a temperature of 160-180°C and laminate roller over its entire length to the final dimensions, and finish rolling at a temperature of 60-80°C.

The disadvantage of this method is the lack of mnogovershinnoe alternating deformation in different directions, which significantly reduces the service life and wear resistance of the friction layer.

The objective of the invention is the improvement of wear resistance of the product by creating a fine-grained structure of the surface layer, ensuring a positive gradient of mechanical properties with depth, and decrease in surface roughness due to the smooth finish obkatyvaem roller and reduced running-in period of the material.

The task is solved in that in the method of manufacturing a friction layer of the bearing sleeve after filling of the liner to produce a bore with an allowance and its plastic deformation according to izopet is of plastic deformation carried out at the temperature of recrystallization of the matrix phase of the alloy, but not above the melting temperature of the dispersed phase with an average speed of deformation of 10-2≤ε≤10-1.

In addition, plastic deformation carried out for several transitions with change of direction for transitions to the opposite.

In addition, the deformation is performed by the tool, material, heat treatment and surface roughness which correspond to the material of the shaft associated with the bearing.

Plastic deformation is performed by the run-steel spherical roller with a radius of 10 mm working surface of the liner of low friction material. It is recommended to conduct a fair turning surface. Running-in is performed on screw-cutting lathe with the following parameters: the pressure of the roller on the item - 200-300 N, depth submission - 0.1-0.6 mm, speed test - 105-224 rpm, the number of passes - 8-20, the strain-rate -10-2≤ε≤10-1. The run was performed at room temperature.

The use of the proposed method ensures a minimum roughness of the working surface of the bearing sleeve, the lower run-in period and minimum wear rate.

A specific example of implementation of the method

On screw-cutting lathe test the working surface of the bearing sleeve from antimic the ionic material - Babbitt B - spherical roller with a radius of 10 mm of steel grade H used for shafts. The run was performed at room temperature with the following parameters: the pressure of the roller on the item - 250 N; depth submission - 0.5 mm; speed running - 200 rpm; the number of passes of 12, starting with the first passage of each subsequent transfer is performed by changing direction on the opposite; the strain-rate of 3.3 10-2with-1. The rate of strain was defined by the table.

The definition of strain rate
№ p/pDefinitionValue
1The degree of accumulated strain εAccording to the results of mathematical simulation0,39
2Length l, mmEmpirically, depending on the dimensions of the part20
3Depth feed S, mmEmpirically, depending on the material of the workpiece within 0.1-0.6 mm05
4Speed for machining length N, rpmN=l/S40
5Speed running V rpmEmpirically, depending on the material of the workpiece within 105-224 rpm200
6Time running 1 turnover t1witht1=60(C)/V0,3
7Time running the length of the handle t, st=t1·N12
8The strain-rate ε, with-1ε=ε/t3,3·10-2

As can be seen from the table, the estimated rate of strain is included in the specified range of 10-2≤ε≤10-1.

The use of the proposed method is provided:

the decrease in the microhardness of the surface layer of Babbitt 1.8 times due to the course of recrystallization processes;

- reduction of the criterion of compatibility with the friction 2.5 times;

- reduction of the surface roughness is reduced by 4 times (to 0.28 μm);

- lowered the e intensity of wear in the steady-state stage by 30%.

Thus, the claimed method can improve the wear resistance of the bearing assemblies by creating a fine-grained structure of the surface layer, formation of a positive gradient of mechanical properties of antifriction layer depth and the decrease of the running-in period of the material.

1. A method of manufacturing a friction layer of the bearing sleeve, in which after filling of the liner to produce a bore with an allowance and its plastic deformation, characterized in that the plastic deformation is carried out in the temperature range recrystallization of the matrix phase of the alloy, but not above the melting temperature of the dispersed phase with an average strain rate of 10-2≤ε≤10-1.

2. The method according to claim 1, characterized in that the plastic deformation carried out for several transitions with change of direction on opposite transitions.

3. The method according to claim 1, characterized in that the plastic deformation is performed by the tool, the material that matches the material of the shaft associated with the bearing.



 

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