RU2296660C1 - Method of repairing seats for roller bearings - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: method comprises dismounting bearing unit, treating the deformed surface by solutions, and applying the repairing agent on the treated surface. The repairing agent is crystallized at a temperature of 70°C and is melted at a temperature above 340°C. The bearing is then heated in oil up to a temperature of 80-90°C, and the bearing unit is assembled.

EFFECT: reduced cost and labor consumption.

Description

The invention relates to mechanical engineering and other industries where rolling bearings are used under heavy loads, leading to deformation of the seats of rolling bearings.

A known method of restoring worn crankshafts [2], which mechanically process the neck with technological deepening into the body of the restored surface across the entire width between the neck cheeks with the formation of fillets and subsequent heat treatment of the crankshaft. The compensating wear of the metal of the lining in the form of a split ring or half rings is fixed on the machined necks by welding their joints. The weld is placed in a zone limited to 25-50 ° of crankshaft rotation from top dead center, and the second seam, when using half rings, is positioned relative to the first with a 180 ° rotation. Cool the weld to ambient temperature, providing a tightness of the split ring 0.1 ... 0.15 mm. When using a split ring, through holes with a diameter of 5-7 mm are made in it. The hole of the split ring with the neck of the shaft, which is located opposite the weld, is boiled first, and the remaining holes are boiled, symmetrically approaching the weld, which will increase the fatigue strength of the crankshaft to the level of a new part while restoring worn necks to their nominal size.

The disadvantages of the method are the high costs and the complexity of the repair work.

A known method of repairing a bearing assembly [3], including disassembling, troubleshooting parts, picking in the form of installation on the seating surface of the outer ring of a worn out bearing of two locally diametrically opposed plates and assembly. The thickness of the plates is determined by the formula Sc = Sr + Su, where Sc is the total thickness of the plates; Sr is the radial clearance in a worn bearing; Su - clearance in the housing bore - outer bearing race joint, subject to wear. The length of each local plate is determined by calculation.

The disadvantages of the method are the high costs and the complexity of the repair work.

A known method of restoring worn surfaces of shafts of sliding bearings [4-5], which consists in heating the hardened area of the part with a binder material previously deposited on it (for example, from a paste from a deposited material) in a high-frequency current inductor until the binder is melted and deposited into place wear of the part, compensating for its wear, characterized in that it is carried out by heating the worn surface of the part to a temperature exceeding the temperature of the critical point AC ₃ by 50-100 ° C, and e produce cooling of the deposited surface of the worn part with the rate of its hardening, moreover, a material with a melting point not exceeding the quenching temperature of the product material is used as a binder.

The disadvantages of the method are the high costs and the complexity of the repair work.

The closest technical solution adopted for the prototype is the method of restoration of crankshafts by increasing the worn surface of the sliding bearings [1], which is realized by sleeving the necks of the main and connecting rod axles of the crankshaft with split sleeves made of material with high abrasion resistance, welded along the line of their cuts in a dense Adhering to the surface of the shaft necks, lubricated before contact with the split sleeves with special glue or sealants.

The disadvantage of this method is the high cost and the complexity of the work.

Comparison of the proposed solution with the prototype and similar solutions known from the existing level of technology allows us to establish its compliance with the patentability criteria of "novelty" and "inventive step".

The technical result of the claimed invention is to reduce costs and the complexity of conducting repair work to restore the seats of rolling bearings.

The specified technical result is achieved in that the method of restoring the seats of rolling bearings includes dismantling the bearing assembly, treating the surface of the seats deformed when using bearings with solutions, and assembling the bearing assembly, wherein, according to the invention, crystallized upon applying the deformed surface of the bearing seats is applied temperature 70 ° С and melting reducing material with viscosity properties melting at a temperature over 340 ° С and strength-mechanical characteristics corresponding to the material of the bearing seats, then the bearing is heated in oil to a temperature of 80-90 ° C and the bearing assembly is assembled by installing a heated bearing in its seats.

The essence of the implementation method is as follows.

A melt of a metallized reducing material is applied to the deformed surface of the bearing seat treated with special solutions, and then the bearing heated in oil is installed in its seat. The bearing is heated to a temperature of 80-90 ° C and, thereby, provide heating of the reducing material to a temperature of 70 ° C, at which the latter crystallizes and gains the mechanical strength characteristics of the material for manufacturing the seat.

The proposed method allows to reduce equipment downtime, costs and complexity when restoring the seats of rolling bearings.

Literature

1. RF patent No. 94019772. Ponurovsky A.A. Ponurovsky A.A. The method of restoration of crankshafts and their sliding bearings. IPC V23P 6/00. Fast. 1994.05.26. Publ. 1996.09.10. Reg. No. 94019772/02.

2. RF patent No. 2235009. A method of repairing a bearing assembly. / Usov V.V. Seregin A.A. Timoshenko A.N. Seregina V.V. IPC V23P 6/00. Fast. 2001.02.21. Publ. 2002.09.20. Reg. No. 2001105022/02.

3. RF patent No. 2189298. A method of repair of a bearing assembly / Usov V.V. Seregin A.A. Timoshenko A.N. Seregina V.V. IPC V23P 6/00. Fast. 2001.02.21. Publ. 2002.09.20. Reg. No. 2001105022/02.

4. RF patent No. 95117550. A method of restoring worn landing surfaces of shafts under sliding bearings. / Ulitovsky B.A., Shkrabak B.C., Ulitovsky S.B., Shkrabak R.V., Polishko G.Yu. IPC V23P 6/00. Fast. 1995.10.17. Publ. 1997.10.20. Reg. No. 95117550/02.

5. RF patent No. 2105650. A method of restoring worn seating surfaces of shafts is plain bearings. / Ulitovsky B.A., Shkrabak B.C., Ulitovsky S.B., Shkrabak R.V., Polishko G.Yu. IPC V23P 6/00. Fast. 1995.10.17. Publ. 1998.02.27. Reg. No. 95117550/02.

Claims (1)

A method of restoring rolling bearing seats, including disassembling the bearing assembly, treating the bearing surface deformed with bearings using solutions, and assembling the bearing assembly, characterized in that crystallized at a temperature of 70 ° C and melting at a temperature above are applied to the deformed bearing surface of the bearing seats 340 ° C molten reducing material with viscous properties and mechanical strength characteristics corresponding to material seats of bearing, the bearing is then heated in oil to a temperature of 80-90 ° C and the bearing assembly is assembled by fitting the heated bearing at its seating.