SU1606245A1 - Method of producing shaped annular articles - Google Patents

Abstract

The invention relates to the processing of metals by pressure. The purpose of the invention is to improve the quality of shaped ring products by reducing defects such as end-face tightening. The billet, heated to the deformation temperature, is preformed to obtain a semi-finished product with a height greater than 1.05-1.5 times the height of the finished ring article. Then a hollow ring billet is rolled on a radial-axial ring-rolling mill. The deformation in the radial direction during the rolling process is carried out by moving one of the radial rolls along the axis of the rolled billet. The amount of movement is maintained at equal to half the amount of reduction in height per revolution of the workpiece. The method allows to obtain products of a complex profile without weights on the face edges with deviations in the height of the finished product within +2 ... -1 mm. 5 ill., 2 tab.

Description

one

(21) 4371249/27-27

(22) 01.28.88

(46) 15.11 .90. B: ol. No. 42

(71) Institute of Ferrous Metallurgy

(72) L.A. Levitsky, V.I. Heifetz, B.A. Chernyshev, B, G. Ovcharov, CiB.Kalibatovsky, A.F., Shulezhko, E.F.Amilaev and V.K. L shcheiko

(53) 621.771.29 (088.8)

(56) Frigge Go Planirov1S forge shops, taking into account the production of blanks for rolling rings. - Ferrous metals, 1971, №.1b, p. 27-36.

(54) METHOD OF MAKING PROFILE RING PRODUCTS

(57) The invention relates to the processing of metal pressures. The purpose of the invention is to improve the quality of the profile ring products by reducing

defects of the type of ironing on the end. The billet, heated to the deformation temperature, is preformed to obtain a semi-finished product with a height greater than 1.05-1.5 times the height of the finished ring article. Then a hollow ring billet is rolled on a radial-axial ring rolling mill. The deformation in the radial direction during the rolling process is carried out by moving one of the radial rolls along the axis of the rolled billet. The amount of movement is maintained at equal to half the amount of reduction in height per revolution of the workpiece. The method makes it possible to obtain products of a complex profile without an ironing along the end face with deviations in the height of the finished product in the range from +2 to -1 mm. 5 ill., 2 tab. 6

(L

The invention relates to the processing of metals by pressure and can be used in the manufacture of hot-rolled ring products such as crowns, large-sized bearings, and t, p.

The purpose of the invention is to improve the quality of the profile ring products by eliminating the tightening of t o or -BVM grams.

Fig. 1 shows the initial billet in Fig „2 - the floor of the billet after molding 5 to fng. The diagram of the rolling process at the initial stage; figure 4 - the same, in the final stage; in fig. ; - finished ring product.

The method is carried out as follows.

The original billet (Fig. 1) with dimensions D, HP is heated to the deformation temperature and fed to the section where the forging equipment is molded in diameter and height to a hollow ring billet with dimensions D, d, H, and the height of the hollow ring billet is larger C) 1.05-1.5 times the height of the finished profile ring product H,;. Then a hollow ring billet 1 (fig.Z) is fed to a radial-axial ring-rolling mill with an external radial shaft, ball 2 and put on the profile concave: O5

N3 4 recounted

Renny radial roll 3 (fig.Z and 4). By means of a power cylinder (not indicated), the profile inner radial roll moves to the upper radial roll 2, the floor of the workpiece is also rolled along the lower axial roll 4. The upper axial roll .5 rotates during the rolling process due to the rotation of the outer roll. radial roll and one or two axial rolls, the rotation is transmitted from the electr

the force of the ram (not specified) of the product I-QD, determines the movement inside the hollow annular stocking of the early radial roll along the ke axis until it touches it. After-rolled ring product

This begins to crimp the hollow ring, in the direction of axial compression, a second billet between the radial and axle-when rolling ring products

washed rolls. When compressed in the radial direction of the scientific research institute, the floor of the oltsev section 15 does not penetrate the entire thickness of the cross section. Due to the non-uniformity of the off-engines through gears (not indicated- Formations, defects of type Zana are formed). The process of deformation of the socket along the face facets. For set-.

The annular billet along the wall thickness of this type of defect is produced by displacement. It is necessary to compress the sectional internal roll 3 to the same height (elimination of the wide radial roll 2 un. 25 and reduction along the main section). hydraulic cylinder (not specified). The squeeze for height reduction of the products is carried out by moving the upper axial roll 5 to the lower axial roll 4, which is not fitted directly, by means of a hydraulic product. When the height of the workpiece is large (not specified) .he height of the finished product is more than

The data on the amount of reductions (movement of the upper axial roll 5) of the hollow annular billet in height during the rolling process goes to the processing unit 6. There is also data on the movement of the inner radial roll to the outer radial roll in the flat T5 perpendicular axis 00 of the roll ring and the current the outer diameter of the rolled product, determined by means of the sensor 7 (Figures 3 and 4). In the processing unit 6, on the basis of the received / data, the magnitude of the displacement of the core internal radial roll along the axis 00 of the rolled ring in the direction of the axial reduction direction is calculated, and the signal 9 is sent to the executive unit 8 (Fig.

to 4). Rolling ring product 50 in the range of 1 at 05-1, 5, depending

The profile is shifted from the height of the finished annular inner radial roll to the final annular product with final dimensions and profile: 0k5 dj, 1, bk (Fig. 3),. I

Moving the profile internal-band 1.05--1, 5 should be chosen

It can have a radial roll. For a larger ratio of the height of the finished profile ring products.

35

40

in height it is necessary that the height of the original ring billet be greater than the height of the finished, ring

1.5, due to the constancy of the volume, the thickness of the wall of the initial ring billet decreases, therefore, when rolling the product, the thickness of the finished product is obtained before the height of the finished product, thereby prolonging the rolling cycle, while due to the reduction in height. Formation of sunsets and wefts on the lateral outer surface.

When the height of the workpiece is greater than the height of the finished product is less than 1.05, the final height is equal to the height of the finished ring article and, at the same time, the workpiece is crimped only over the mashard, therefore defects like the end face of the face face occur.

From these conditions, the boundaries of determining the height of the workpiece are accepted.

first product H,

It was established experimentally that the greater the height of the workpiece from

45

implemented mechanically by

gear, and also via a power cylinder connected to an inner roll.

Measure the displacement of the upper axial roll, the current value of the outer diameter and the displacement of the inner radial roll in the plane perpendicular to the axis of the rolled

 thin in height (elimination of broadening and crimping along the main section). In order to effect the reduction of products. When the height of the workpiece is higher than the height of the finished product more than

in height it is necessary that the height of the original ring billet be greater than the height of the finished, ring

1.5, due to the constancy of the volume, the thickness of the wall of the initial ring billet decreases, therefore, when rolling the product, the thickness of the finished product is obtained before the height of the finished product, thereby prolonging the rolling cycle, while due to the reduction in height. Formation of sunsets and wefts on the lateral outer surface.

When the height of the workpiece is greater than the height of the finished product is less than 1.05, the final height is equal to the height of the finished ring article and, at the same time, the workpiece is crimped only over the mashard, therefore defects like the end face of the face face occur.

From these conditions, the boundaries of determining the height of the workpiece are accepted.

first product H,

It was established experimentally that the greater the height of the workpiece from

wall thickness () and greater height of the finished profile ring product.

B. Table 1 shows the recommended values of the coefficients for determining the height of the original billet, depending on the final height of the profile ring article H, and the ratio HK / S.

sixteen

When rolling due to crimp by you. In the honeycomb of the workpiece, the cross section of the rolled ring product settles relative to the roll gauge. If the radial roller is not lowered by the amount of settling of the section of the rolled product, i.e. if during the rolling process the radial roller does not move along the billet axis by an amount equal to half of the reduction in height per one turn of the billet, curvature of the rolled product relative to the caliber of the roll occurs, which leads to failure of the product profile and the impossibility of obtaining a quality product.

Example. The original billet (FIG. 1) with dimensions of 365x286 mm and mass of 235 kg m is heated to a deformation temperature of 1250 ° C, then formed on the press with an effort P 40 MH in diameter and height to produce a hollow ring billet with dimensions equal to 474x250x216 mm.

The height P of the original ring billet is selected based on the height of the finished ring article mm ratio (4 8 and dainm shown in Table 1.) The height of the original ring billet is H 1.08, H; j 216 (mm). Then the hollow ring billet is served radially -axial ring rolling mill is put on the profile internal radial roller 3 with diameter d 240 No. G. By means of a power cylinder (not specified), the professional internal radial roller is moved to the external radial hammer 2 with a diameter of 600 mm.

 The floor, the annular billet is also on the axle roller 4. The upper axial roller 5 is powered by a hydraulic cylinder (not specified). Move to the hollow ring billet until it comes into contact with it. After that, the compression of the hollow ring is started.

62456

billet between the radial and axial rolls.

During the rolling process, the ring billet rotates due to the rotation of the outer radial roll and the lower axial roll from the DC motors through the Torque gear (not specified). The deformation of the hollow ring billet through the wall thickness is carried out by moving the core inner roll 3 to the outer radial roll 2 by means of a hydraulic cylinder with a force P J5 MN (not specified). The compression in height is effected by moving the upper axial roll 5 to the lower axial roll 4 fixed by means of a hydraulic cylinder 20 with a force P of 1.25 MN (not specified).

The height of the rolled billet rolls is determined by the height of the upper axial roll, 25 the diameter growth data is recorded with a special meter of the current outer diameter of the rolled billet 7, mounted between the axial rolls, and the wall thickness of the rolled billet is determined by the displacement of the inner profile radial roll 3 This data enters the processing unit 6, where the magnitude of the displacement of the internal profile radial roller 3 is calculated. The signal from the processing his unit 6 is supplied to the execution unit input 8 - cylinder.

By means of the actuating unit 8, the internal profile radial roller Z is moved down along the axis of the rolled billet 00 in the rolling process.

Ring rolling product lead

to the final dimensions of the product xNu.l1, xL 910) 860 200x30x20 (mm). According to the proposed method, a pilot was manufactured of a pair of ring-shaped articles of the type of rims with the specified dimensions. Studies of the quality of rolled products showed that defect-type. utes for that. no face.

five

0

At the same time, the quality of products manufactured in a known manner was investigated, a flaw type defect on the face face was observed in 30% of products.

Table 2 shows the modes of compression and movement of the internal profile radial roll.

When rolling products of a complex profile by the proposed method, there are no defects in the form of an ironing along the face face, and the deviations in height of the finished product are in the range from +2 to -1 mm.

Claims (1)

Invention Formula The method of manufacturing the profile ring products, including heating the original billet, preforming the hollow billet in diameter and height and rolling with simultaneous deformation in the radial direction 0 five P with a pair of radial rolls and in the axial direction with a pair of axial rolls, one of which is fixed in the axial direction, characterized in that, in order to improve the quality of the ring products, in the process of preforming, a billet with a height exceeding 1.05-1 is obtained, 5 times the height of the finished ring product, and during rolling, the deformation in the radial direction is carried out with the movement of one of the radal rolls along the axis of the billet in the direction of axial reduction, while setting the displacement amount equal to half the height reduction per revolution of the workpiece. (, Table 1 Table 2 1606245 10 Continued table. 2 Fig.1 S -BUT 2 Oziaz