SU1207592A1 - Method of producing profile rings - Google Patents

Description

one

The invention relates to the processing of metals by pressure and may be used in the manufacture of annular products for aircraft and rocket production, bearing cages, bandages, rims, flange profiles and

Tod

The purpose of the invention is to increase the ratio used 1 of the material and quality of the rings by increasing their geometric and dimensional accuracy.

Figure 1 shows the stages of rolling the workpiece} in figure 2 is a graph of the dependence of the parameters of the method.

The method is carried out as follows (Fig. 1).

Hollow billets 1 heated to temperature deformations (fig G, a), obtained by different methods - piercing, casting, forging, etc., with geometrical dimensions D, x, go to the roughing mill (Fig. 1.6c). On a roughing mill, a hollow billet 1 is subjected to compression in the radial direction between the inner roller 2 and the outer 3, the diameter ratio of which is 1.0, and in axially between the front rollers 4. As a result of roughing, semi-finished product 5 is obtained with geometrical parameters DO, dj, S ,, B ,, (Fig. 1, c, d. Semi-finished product 5 is transferred to a finishing mill, where it is subjected to compression in the radial and axial direction. When finishing rolling, the reduction of semi-finished product 5 (Fig. 1, d, e) in the radial direction is carried out between the inner roller 6 and the outer roller 7, with the ratio of the diameter of which is less than the unit D, “1 n is selected within O, 2 ... O, 95 .. Simultaneously with the radial deformation during finishing rolling, the semi-finished product 5 is additionally pressed in the axial direction between the end rolls 8, and the reduction value the height of the semifinished product (iBP - D in) exceeds 1.1 ... 1.5 times the value of the broadening of the material of the semifinished material formed on the end surfaces during compression in the radial direction.

As a result of finishing rolling, the finished product 9 is obtained with the final specified dimensions: D, d, S, B, h, b in mm (FIG. 1, d.

40 5 jo

55

207592

The optimal ratios and the magnitude of the coefficient (p.) Of over-reduction during finishing rolling are determined by the indicated method.

with Example. Rings are made with a shelf (Fig. 1, d) weighing 1520 kg of steel 45, geometric parameters D 3900 mm, S 125 mm, B 100 mm, h 120 mm, b 30 mm. For

10 of this use individual blanks weighing 1575 kg, which are heated to the deformation temperature, precipitate and sew (not shown in figure 1). As a result

J5 of these operations receive a hollow billet 1 (figo1, a) with dimensions D xd, xB 1308 X 260 X 150 mm, which is subsequently decomposed on a rough ring mill (Fig. 1.6, c) by sequential reduction in the radial and axial directions. The compression in the radial direction is carried out between a pressure inner roller 2 with a dimension Dgn of 230 mm and on a narrow roller 3 with a size D of 1150 mm, i.e. at a ratio of 1150/2305.

The compression in the axial direction is carried out between the end rolls 4 from a height B of 150 mm to a height of B 115 mm. As a result of the base rolling, semi-finished product 5 with sizes DO 1674 mm, do 800 mm, So 437 mm is obtained. In 115 mm. Semi-finished product 5 is transferred to a finishing ring - a rolling mill (Fig. 1, g, where it is expanded to the finished dimensions and cross-sectional shape.

The finishing rolling of the semifinished product is carried out by cutting in the radial direction between the inner roller 6 of size D 780 mm (technologically determined) and the profile outer roller 7 with a minimum size according to the gauge of Bz 200 mm, i.e. at a ratio of 200/780 0,256. At the same time, the semi-finished product 5 is additionally subjected to axial compression between the end rolls 8 by an amount of 1.41 times greater than the broadening of the material formed during the reduction of the semi-finished product in the radial direction. The magnitude of the broadening of the material as a result of the reduction in the radial direction when finishing rolling during one revolution of the semi-finished product 5 varied within 5 mm. In accordance with this, the magnitude of the

thirty

35

Reduction in the axial direction when finishing rolling is prescribed equal to 5 liters 1.41 7.0 mm. Under these conditions, finishing rolling is carried out to obtain the specified dimensions and the product profile (Fig. 1, e). The optimum ratio of the sizes of the outer and inner rolls (,) and the coefficient (p) of the reduction in the axial direction when finishing rolling the semi-finished product is determined according to this method, namely based on the size of the semi-finished product 5 and the size of the finished ring, the ratio of the following geometric parameters is calculated

"7 3 5- - 125 S

30 120

 0.25; AT

100 T25

 122

thirty

0.8; 3.3,

on the basis of which the optimum value of the BM / Yuvc ratio and the value of the coefficient (ti) for the reduction in axial direction are determined.

The ratio is determined according to the value

HF

-r-- 0.25 and a value of - 3.5 according to

graphics (figure 2). The range of the ratio of scientific research institutes DH / D, at which it is possible to obtain a finished ring with a given configuration (shelf on the outer contour, according to the schedule is in the range of 0.2-0.33.

The maximum possible diameter of the inner roll when finishing rolling, based on the size of the inner hole of the semi-finished product 5 (d, 800) mm, is chosen to be

Obi

780 mm. Regarding this

The outer roll of DH will be at the lower limit D 0.2 0.2 780 156 mm, at the upper limit DH 0.3 Dg 0.33 780 255 mm.

On the basis of the obtained size range of the outer roll, its minimum diameter in caliber is calculated as the average value of WH

156 + 255 „.,

- 200 mm, and the maximum

0

0

five

0

five

diameter according to the caliber from the condition Ots Jut + 2h 200 + 2 120 440 mm.

Thus, finishing rolling is carried out between the inner roller with a diameter of 780 mm and the outer profile roller with a minimum diameter of 200 mm in caliber, i.e. at a ratio of 200/780 0,256. The magnitude of the exceedance coefficient (p) is determined according to the ratio B, 100, and the correction is –rsr- 0.8 (for a given

case 1.41).

The optimum ratio of the sizes of the outer and inner rolls is 1) c / B (for the finishing rolling in the production of recessed rings, it is determined similarly to V and the coefficient (n) of the reduction in axial direction of compression is depending on the value of the ratio B B

The invention has the following advantages as compared with the base object, which is the prototype, as it increases the utilization rate of the material by approximating the profile after rolling to the finishing dimensions after machining; reduces the laboriousness of processing due to reduction of metal waste into chips; improves the quality of rings by increasing their geometrical and dimensional points. Toosti. by reducing the lipe- rious permissible deviations per product to be produced.

shene

01

0.2 0.15 0.6

phi.2

0.8

1.0 / L

Claims (1)

METHOD FOR PRODUCING PROFILE RINGS, including rough rolling of a hollow workpiece while simultaneously compressing it in the axial and radial directions and finishing rolling with compression of the semi-finished product and radial direction, is distinguished by the fact that, in order to increase the utilization rate of the material and the quality of the rings by increasing their geometric and dimensional accuracy, the final rolling of the semi-finished product in the radial direction is carried out with the ratio of the diameter of the outer roll to the diameter of the inner 0.2 - 0.95 and compression of the semifinished product in the g axial direction, the magnitude of which exceeds 1.1-1.5 times the magnitude of the broadening of the material of the semifinished product when compressing in the radial direction. SU.J 207592