SU730835A1 - Method of manufacturing locomotive wheel centers - Google Patents

Description

one

The inventions are related to the TepNTritvecKofi product processing area after rolling.

The known method is terg treatment of railway wheels after rolling by means of their controlled cooling in various temperature ranges G1.

 Locomotive wheels are manufactured by a method of casting with post-heat treatment in the form of normalization. This method of BeatM performance is low and cost is high.

Most closely related to the technical nature of the invention is a method for manufacturing the centers of locomotive wheels, including the preparation of a blank followed by a TepNiH4ecKOR treatment with G21. In this case, the billet is produced by casting, and the thermal treatment is carried out by heating to the normalization temperature for about 10 hours and holding at this tempera, a round for 4 Fc, followed by air cooling. This method is also prone to low productivity and high cost of manufacturing centers.

The aim of the invention is to provide a B1: LIQUID PROCESSOR and increase the cost of manufacturing centers.

The delivered chain is achieved by the fact that the billet is produced by hot rolling, and the thermal treatment is carried out by cooling from the temperature of the end of rolling at a speed of 10-30 vcdH to 600-GSO ° C, holding for 3 hours.

10 3-4 hours, cooling at a speed of 2-10 degrees / 1.l-1H to 250-300 ° C, heating to VZO-VbO-s, holding for 0.5-1.0 hours, cooling at a speed of 30 -60 grs / 1H to 600-6,. but he fled;

15 with a speed of 2-10 degrees / mzhN up to 480520 ° С and tempering at this temperature.

Such removal by rolling and thermz-1co G1 processing allows

20 significantly reduce the process of obtaining blanks and so significantly reduce the cost of manufacturing products.

The essence of the method is

25 the following.

The steel ingot is divided into dimensional blanks. Each billet is subjected to successive slumping, molding using presses and rolling on a wheel rolling mill.

30 According to the rolling assurance of the germic - wire, wire G by way of oh.lakchdeni from the end of rolling at a speed of 10-30 degrees / min to bOO-660 C. With this: the tempe- rature of the center's locking is maintained for 3- 4 hours, after which they are cooled down with a speed of 2-10 degrees / n up to 250-300 ° C .. Then, billet blanks are heated with nuclear weapons 830-860 0, they are kept for 0 hours, cooled with a speed of 2-10 degrees / № 5N to 480-520 0, nprf of which, the goods are shipped for 2-3 hours. The speed of rolling and melting (LO-30 degrees / m) after exposure at 600-680 С (2-10 degrees / min after capillary and aging at VZO-860 ° С (30-60 deg / min are determined by the chemical composition of the steel. Craft centers are steel for carbon with 0.45-0.60% carbon content. Lower speed limits are about: la; cdenium correspond to steel with carbon 0,60%, and the top - steel with a carbon content of 0.45%. Example, method implementation. This method was tested in industry 5: l4nx conditions when it came to ozkne-n-i Locomotive centers. wheels made of steel with the content of the following components,%; carbon 0.58, grade 0.76. The steel ingot is divided, on, measured billet weighing 420 kg. The blanks were heated, and the B ring furnace up to 1240 s was upset on the press with forces of 20.00 ton-force and 5000 ton-force and molded on the press with a force of 10,000 ton-force, after which it was rolled on a rolling wheel. After rolling, the centers were cooled with a speed of up to by blowing their thorn dm valve with air. After that, they were subjected to anti-flocking treatment by aging at this TeNmepaType for 4 hours, and then cooled to 280 ° C at a rate of 3.5 ° / 1-unit in the feet in fenced thermos. Then, the billet centers were heated to, held for 0.75 h, after which they were cooled, at a rate of 48 K / min to by supplying fan air to the center-rotating workpiece. After that, they were cooled to 520 ° C at a speed of 3.9 deg / min while driving along the first roller table. At 520 ° C, they were released for 2.5 hours. Thanks to this method, by rolling and terg-processing, the time for the manufacture of center blanks is reduced by about two times, while the labor costs are reduced by 40%. .la of the invention. A method of manufacturing centers of locomotive wheels, including obtaining a workpiece with subsequent terg-adic treatment, characterized in that, in order to increase productivity and reduce the cost of production, the workpiece is obtained by hot: rolling, and heat treatment is effected by cooling from temperature the end of rolling at a speed of 10-30 degrees / mi to 600-680s, exposure for 3-4 hours, cooling at a speed of 2-10 degrees / t in to 250-300 ° С, heating to 830-860 ° С, holding in for 0.5-1.0 h, cooling at a speed of 30-60 degrees / min to 600-6 80 C, then cf a speed of 2-10 degrees / m: -: n up to 480-520 C and tempering at this temperature. , Sources of information accepted in the examination during the examination 1. USSR author's certificate No. 615140, cl. C 21 D 9/34, 1975. 2. Thermal processing of steel casting. 24407, 25250, 75064. Technological instructions Voroshilovgrad. Diesel locomotive plant. Oct of the Brno revolution, 1976 H prototype)

Claims (1)

Claim A method of manufacturing centers of locomotive wheels, including the preparation of a billet with subsequent heat treatment, which is explained by the fact that, in order to increase productivity and reduce manufacturing costs, the billet is obtained by hot rolling, and heat treatment is carried out by cooling from the temperature of the end of rolling at a speed of 10-30 deg / min to 600-680 ° C, holding for 3-4 hours, cooling at a speed of 2-10 deg / min to 250-300 ° C, heating to 83C-860 ° C, holding for 0 , 5-1.0 h, cooling at a speed of 30-60 deg / min to 600-680 ° C, then at a speed awn 2-10 dg / min to '4 80-52 (6 C and tempering at this temperature.