The method of hardening steel wheels

 

(57) Abstract:

The invention relates to metallurgy, and in particular to methods of hardening steel castings and rolled wheels. The technical result of the present invention is to improve the operational stability. The method of hardening steel wheels, including heat treatment of the rim and its reinforcement by the stiffening elements having a hardness exceeding the hardness of the material in which they are performed. The stiffening elements are in the form of tracks, with tracks that encircle the surface profile of skating wheels, perform open and shift places rupture paths between a ratio of the section height track width 1 corresponds to 3-5. 1 Il.

The invention relates to metallurgy, and in particular to methods of hardening of cast steel wheels and solid wheels.

There is a method of hardening steel wheels [1], including heat treatment of the surface profile of the riding wheel and its reinforcement by the stiffening elements having a hardness exceeding the hardness of the material in which they are performed. Reinforcement of the surface layer is produced by performing the holes, the walls of which oblada performed separately plots the hardness is insufficient connects the volume of the metal and the formation of the Bicycle wheel during operation is offset from the metal surface layer. Another disadvantage is that when poor-quality laser processing holes occur plots with an internal voltage different from the voltage of an adjacent parcel and the voltage of the metal surface layer skating wheels, and in the presence of metal defects, such as voids, delamination, etc. may damage the wheels. And also, dynamic impacts arising from the movement on the rail joints, switches and other local stiffeners leads to chipping of metal and as a consequence of damage to the wheels. And all this leads to lower operating resistance of the wheel.

The aim of the present invention is to improve the operational stability of the wheel.

This objective is achieved in that in the method of hardening steel wheels, including heat treatment of the surface profile of the riding wheel and its reinforcement by the stiffening elements having a hardness exceeding the hardness of the material in which they are performed, the stiffening elements are in the form of tracks, with tracks that encircle the surface profile of skating wheels, perform open and shift places rupture paths between a ratio of the height of the CE is strasti perform in tracks, with tracks that encircle the surface profile of skating wheels, perform open and offset locations tear tracks between themselves and the ratio of the section height track width corresponds to 1 to 3 to 5, allows you to link the amount of the metal roll surface sufficient to eliminate its movement in the form of rent and to reduce the contact area of the tread surface of the wheel with the rail and the brake pads and eventually to increase the operational stability of the wheel.

In Fig. 1 is a diagram of the complete method.

On the surface 1 Catania wheel 2 is made track 3 rigidity, hardness exceeding the hardness of the material in which they are performed. The ratio of the height h of section 4 lanes 3 and width L corresponds to 1 to 3 to 5. Track 3, encircling surface 1 profile Catania wheel 2, is made open and offset 5 divide paths between them.

The method of hardening steel wheels 2 implemented as follows. In accordance with the chemical composition of the metal wheel 2 select a certain power of the laser radiation. A focused laser beam is directed perpendicular to the processing surface 1 wheel 2 while rotating the residual for heating and education track 3 stiffness ratio of the height h of the cross-section to its width L=1 to 3 5. This ratio is optimal for phase transitions of metal and forming a reinforcing tracks with hardness exceeding the hardness of the material in which it is made. Obtained in a stable form section 4 of hardened layer has a smooth transition from high hardness on the surface of the section to the original hardness of the metal in any radial direction. The transition from one track 3 produced by another smooth on and off the laser light source. In the case of performing tracks 3, encircling the rolling surface of the wheel 2, they are open and offset locations of the gap 5 track 5 between them.

Test method produced the reinforcement of the pair of wheels with a diameter of 970 mm gas laser power of 1.4 kW. Made track stiffness wide cross-section of 4.5 - 5 mm and a height of 1.2 mm, field tests have shown that when the mileage 56000 km Bicycle wheelset was 0. At the same time control the raw wheelset with such de mileage showed the car surface = 0,9 mm

The implementation of this method allows to obtain a significant economic effect; since the reinforcement 240 wheelset economic effect of colournote profile skating wheels and reinforcement stiffeners, having a hardness exceeding the hardness of the material, in which the stiffening elements are made, characterized in that the stiffening elements made in the form of tracks, with tracks that encircle the surface profile of skating wheels, perform open and shift places rupture paths between a ratio of the section height track width 1 corresponds to 3-5.

 

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