SU1764749A1 - Rings making method - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in the manufacture of predominantly massive rings on ring-rolling mills in a combined form. The purpose of the invention is to increase the efficiency of the process and save metal. The semi-finished product in the form of a double ring billet, obtained by draft, is rolled out in rolls of a 1.2-mill rolling mill. In the process of rolling between the semifinished product, connecting bars 3 are formed, which are located outside the contour of the semifinished products. Next, the draft is carried out with the closure of the ends of the rings in the zone of their connection by bridges. The precipitation is carried out until the removal of slopes 4.5 at the ends of the semifinished products 1 C, ff, 4 sludge.

Description

The invention relates to the processing of metals by pressure and can be used in the manufacture of rings on ring rolling mills.

The aim of the invention is to increase the efficiency of the process and save metal.

Figure 1-4 shows the main technological operations in the manufacture of rings: figure 1 - getting a draft of semi-finished rings, for example, on the press; figure 2 - rolling semi-finished rings in the roughing stand; FIG. 3 shows rolling of semifinished rings in a finishing ring-rolling cage with the formation of a carried over lintel; figure 4 - the closure of the end surfaces of semi-finished rings, for example, draft on the press.

The essence of the method is as follows.

The billet is heated to the temperature of hot plastic deformation (1150-1280 ° C, depending on the steel grade), subjected to settling, distillation with an L-punch and piercing. The resulting annular shaped billet in the form of double semi-finished rings is rolled in rough and finish ring rolling cages between the driven vertical roller 1 and roller 2.

When rolling, the double semi-finished products are deformed with the formation of a depression located along the axis of symmetry of the semi-finished products and bounded by internal lateral ends with inclines and a connecting bridge. In the roughing stand, the blank is pre-cut by an annular ridge and the formation of a tackle for the finishing stand. In the finishing ring rolling stand, the final rolling of the semi-finished products into two profiles and the formation of a connecting web 3 located outside the contour of the semi-finished products are carried out. A prerequisite for building gauges formed by rollers 1 and 2 is to

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with

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4 VI

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f them technological slopes as side 4, and in the area of the connecting jumper 5.

The presence of inclines in gauges makes it possible to prevent the metal from bending the rolls, to obtain a high-quality (without captivity) rolling surface, to increase the service life of the gauges, to reduce the incisions during their refining. At the same time, they form technological biases on the profile of the ring, thereby increasing the mass of the product and the consumption of metal. And if the side technological slopes in principle are eliminated when rolling in inclined rolls, then there is no possibility of eliminating technological slopes in the zone of profile matching during rolling. Therefore, the next operation provides for the operation of precipitation of double semi-finished products between the plates 6 on the press, before closing the end surfaces of the rings in the zone of their separation to eliminate the slopes formed by the technological slopes of the calibers, and form a final jumper. The resulting combined profiles are finally retained by a connecting web outside the inner or outer surface of the ring. This increases the productivity in the subsequent processing of the outer and inner surfaces of the rings, since two products are installed and processed simultaneously. The conditions for the subsequent separation of the rings are accordingly improved, since it is not necessary to perform labor-intensive operations of cutting profiles with significant length cutters, which occur if the jumper is between the profiles.

In order to prevent the semi-finished rings from moving relative to each other, the connecting jumper is made with the stress concentrator 7 in the form of a recess in the middle of the jumper 3.

Example. The proposed method was manufactured tram bandages according to GOST 5257-79 with a diameter of 720 mm in a Katani circle and a weight of 104 kg in nominal ... dimensions. As the initial billet, ingots with a diameter of 400 mm and a mass of 2500 kg were used, which were divided into individual billets with a mass of 255 kg. The blanks were heated to a temperature of 1220–1280 ° C and after the operations of precipitation, expansion and firmware, annular shaped semi-finished products with an internal diameter of 250 mm were obtained.

When rolling on a roughing mill, the semi-finished product was pre-cut by an annular ridge having a length of 40 mm and a height of 30 mm and rolling on the inner diameter up to 500 mm.

In addition to the final formation of all elements of the combined bandages and their rolling to an internal diameter of up to 605 mm, the ring semi-finished product was cut with a 95 mm long ridge in the finishing ring rolling stand.

on two profiles and rolling of the connecting lintel 5 mm thick, taken out of the cross-section of the combined profiles. Profiles were obtained with technological side slopes and slopes in the area of the connecting bridge equal to 3 °.

Subsequently, a press with a force of 60 mm carried out the operation of precipitation on smooth slabs, which ensured the closing of the end surfaces of the semifinished products of the rings in the separation zone, the reduction of all technological slopes formed by the technological calibres, and the final formation of the connecting bridge completely removed

the inner surface of the rings.

The operation of removing the connecting bridge was combined with machining of the tires.

The proposed method allows to significantly reduce the cost of rings and save the metal removed in the known methods from the end surfaces of the rings.

Claims (2)

1. A method of making rings, comprising shaping the semi-finished rings in dual form by sediment and rolling to form a depression on the side of the outer generatrix and located along the symmetry axis of the semi-finished products of the rings and connecting bridge, the subsequent separation of semi-finished rings, characterized in that process and eco After rolling, an additional slump of semifinished rings is carried out after rolling, and during rolling the double semifab riks of the rings are deformed with the formation of a depression bounded by internal lateral the outer ends of the rings with slopes and the connecting bridge located outside the contour of the semifinished products, while at the additional draft, the inner side faces are closed semifinished rings and elimination of their marks. 2. Method pop. 1, characterized in that, in order to improve the quality of h; by eliminating the displacement of prefabricated rings relative to each other, when rolling Ke connecting bridges along the axis of a sym- concentrator of stresses in the form of deepening of semi-finished rings are performed with laziness. 1 Fig.Z / / } FIG. 2 Yy L Ib UV .4