ENHANCEMENT OF WEAR RESISTANCE OF CUTTING TOOLS DURING RAILWAY CAR’S WHEEL TURNING

Accuracy and quality of manufacture and repair of critical parts of the rolling stock running gear are directly related to manufacturing quality, accuracy and durability of the used cutting tool. One way to improve its wear resistance in material processing is reduction of the thermal stress of the contact layers of the tool and the component part by the intensification of heat removal in the cutting zone [1].

The most effective way to improve heat removal is to use coolant-cutting fluids and media (CCF and CCTM). However, there are cases where their application is impossible due to technical or technological requirements.. The objective of the authors is to analyze a problem of wear resistance increase of the cutting tool at railway car-wheel processing, using engineering analysis, modeling, statistical method, evaluation method. One of the important results of this work was to identify rational areas for the use of heatconducting interfaces for different types of mechanical processing of the wheel tread profile. A method to increase the resistance of carbide cutting tools with the use of special silicone elastic compositions of high thermal conductivity, offered by the department «Technology of transport engineering and repair of rolling stock» of MIIT, was tested. Such compositions, applied to the reference plane of the tool holder socket plate, provide elimination of air pockets in the place of contact with the carbide plate which in turn improves heat removal from the cutting plate and thereby increases its wear resistance. The use of carbide tool with flexible thermally conductive gaskets of sheet reinforced material allowed increasing resistance of the cutting tool by almost 17% according to performed tests.

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