SU912319A1 - Edge bending apparatus - Google Patents

Description

Union of Soviet

Socialist

Republic <". 912319

State Committee

USSR

DESCRIPTION

Inventions

TO AUTHOR'S CERTIFICATE (61) Additional to author. certificate (22) 3Approved 10.01.80 (21) 2925700 / 25-27 with the addition of application No. (23) Priority for inventions and discoveries

Published on March 5, 2018. Bulletin Λ »10

Date of publication of the description 03.15.82 (72) Authors of the invention (71) Applicant (51) M. Cl ³

B 21 C 37/06 (53) UDC 621.

.774.21 (088.8)

TO). D. Volper, Yu. I. Makievsky, Π. N. Kalinushkin,

G.I. Gulyaev, E.P. Petrunin, E.I. Ivanov ,. V. A. Barashkov,} V. I. Nikolenko, 10. A. Zaplatkin, 3. I. Sobolevsky, /

M. S. Ovcharov, V. F. Razin, B. F. Antipov, V. A. Lesechko, / O. V. Tantsyrev, V. A. Kuznetsov and V. S. Tolmachev

............... / (54) EDGE BENDER

The invention relates to the processing of metals by pressure and can be used in the design of mills for the manufacture of pipes, which are subject to increased requirements for the cross-sectional profile, for example, casing pipes, on which • threading is subsequently necessary, as well as for special-purpose pipes.

To obtain pipes with the required accuracy along the cross-sectional profile, a necessary condition is to ensure the formation of the edges of the pipe billet with a radius close to or equal to the radius of the pipe. This is necessary in order to exclude the formation of the so-called creppi on the pipes, i.e. straightened sections in the weld zone. The presence of krappi on pipes significantly reduces their quality, increases rejects, and also limits the scope of such pipes.

The closest in technical essence and attainable result to the proposed is edging device comprising a frame mounted thereon and two pairs of rollers ³ for each of the edges vyformovki tubular blank having the ability to move in vertical and horizontal directions, and the possibility of changing their angle nak- ^{1 0} womb 11J.

The disadvantage of this device is the low quality of the forming edges in the manufacture of relatively thick-walled pipes. This obuslov ¹⁵ Leno in that when forming pipes with a relatively low ratio of diameter to wall thickness is impossible to approach the inner ring rollers to one another without reducing their dimensions. When reducing the overall dimensions of the rolls, the structural rigidity of the edging device is weakened

91 and, in addition, high-quality forming of the edges is not ensured due to insufficient pressure of the roll tool on the formed edges. For forming thick walls of non-ι, we go around a powerful, roll tool and the corresponding rigidity of the design of the bending stand.

The purpose of the invention is to improve the quality of forming edges.

To this end, in a bending device containing a bed with two pairs of rolls located on it, installed with the possibility of vertical and horizontal movement and changing the angle of inclination relative to the molding axis, one pair of rolls is offset relative to the other along the molding axis.

In the proposed bending device, the pressure of the rolls on the edges of the tube stock provides high-quality forming of the edges of the tube stock without reducing the overall dimensions of the rolls and the rigidity of the stand due to their displacement relative to each other along the longitudinal axis of the tube stock, since the axis of the pairs of rolls are located in different planes, which allows you to move pairs of rolls independently of each other across the width of the formed tape.

In FIG. 1 and 2 schematically depict an edging device; in FIG. 3 - shaping the original tape after molding in the edging device of the proposed design.

The bending device consists of a bed 1, on which two pairs of rolls are installed, each of which has an outer roll 2 and an inner 3. The outer rolls 2 have devices for moving them in the vertical 4 and horizontal 5 directions. The movement of the inner rolls 3 is regulated in the horizontal direction by the device 6, in the vertical direction by the device 7. The outer and inner rolls of each pair are equipped with a device for changing the angle of their inclination 8.

The work of the proposed edging device is as follows.

After the tube blank (tape) passes the master stand of the molding mill (not shown), it enters the first pair of rolls of the edging device, where

4 there is a bend of one of the edges of the pipe billet along the radius of the finished pipe (Fig. For). After the tape leaves the first pair of rolls, it falls into the second one, installed with an offset relative to the first pair of rolls along the longitudinal axis of the tape, where the other edge is bent along the same radius. The amount of displacement of the rolls is selected based on the overall dimensions. After the tube billet exits the edging device (it has the form shown in Fig. 3 b), its final molding and welding are performed.

The application of the proposed bending device can improve the quality of forming edges by providing the necessary pressure of the rolls on the edges of the tube billet without reducing the overall dimensions of the rolls, or by · increasing their overall dimensions in the case of forming a thicker billet, this is achieved by shifting them relative to each other along the longitudinal axis of the tape . In addition, the required rigidity of the edging device is provided, and the handling of stands is simplified.

The economic effect of using the proposed edging device is ensured by the possibility of manufacturing new types of welded pipes (thick-walled, casing), reducing the time for transshipment and reducing the fleet of the forming tool.

Claims (1)

The invention relates to the processing of metals by pressure and can be used in the design of mills for the manufacture of pipes to which increased demands are made on the cross sectional profile, for example, casing pipes, on which further thread cutting is required as well as pipes for special purposes. To obtain pipes with the required accuracy over the cross-sectional profile, a necessary condition is to ensure that the edges of the pipe billet are molded with a radius close to or equal to the pipe radius. This is necessary in order to eliminate the formation of the so-called krppi on the pipes, i.e. straight sections in the weld zone. The presence of pipe gags on the pipes reduces their quality, increases the scrap, and also limits the scope of use of such pipes. The closest in technical essence and the achieved result to the proposed is a bending device containing a frame and two pairs of rollers mounted on it to extrude each of the edges of the billet, having the ability to move in the vertical and horizontal directions and the possibility of changing their angle c1J. The disadvantage of this device is the low quality of the extrusion of the edges in the manufacture of relatively large Jp. Wall pipes. This is due to the fact that when forming pipes with a relatively small ratio of the diameter to the wall thickness, it is impossible to approach the inner cage rollers to each other without reducing their overall dimensions. When reducing the overall dimensions of the rolls, the rigidity of the structure of the bending device 3 weakens, and, moreover, the edges of the roll tool do not have good quality because of insufficient pressure values of the roller tool on the molds. To form thick walls, we go around a powerful, rolling tool and a corresponding rigidity of the bending cage. The purpose of the invention is to improve the quality of the shaping of the edges. With this aim, in the bending device containing a frame with two pairs of rollers mounted on it installed with the possibility of vertical and horizontal movement and change of the angle of inclination relative to the forming axis, one pair of rolls is displaced relative to the other to the forming axis, In the proposed bending device the pressure of the rolls on the edges of the billet ensures the high-quality extrusion of the edges of the tube billet without reducing the overall dimensions of the rolls and the rigidity of the stand design due to their displacement differently relative to each other along the longitudinal axis of the billet, since the axes of the pairs of rolls are located in different planes, which allows moving the pairs of rolls independently of each other across the width of the forming tape. FIG. 1 and 2 schematically shows a bending device; in fig. 3 - shaping the original tape after forming in the high-bending device of the proposed design. The bending device consists of a bed 1 on which two pairs of rolls are installed, each of KOTOpbix has an outer roll 2 and an inner 3. The outer rolls 2 have devices for moving them in a vertical 4 and horizontal 5, the movement of the inner rolls 3 is regulated in the horizontal direction by the device 6, the vertical by the device 7, the outer and inner rolls of each pair of sleepers by the device to change the angle Their slope is 8, the operation of the proposed bending device is carried out as follows. After passing through the tube load (tape) of the forming stand of the forming mill (not shown), it falls into the first pair of bending rolls, where one of the edges of the tube blank bends along the radius of the finished pipe {Fig. Behind). After the tape leaves the first pair of rolls, it falls into the second one, set offset from the first pair of rolls along the longitudinal axis of the tape, where the other edge bends along the same radius. The roll offset is selected based on the overall dimensions. After the billet comes out of the bending device (it looks like that shown in Fig. 3b), it is finally formed and welded. The use of the proposed bending device allows one to improve the quality of edge shaping by providing the necessary pressure of the rolls to the edges of the billet without reducing the overall dimensions of the rolls, or by using the | increasing their overall dimensions in the case of forming a thicker wall, this is achieved by displacing them relative to each other along the longitudinal axis of the tape. In addition, the rigidity of the bending device is necessary, and the transshipment of the stands is simplified. The economic effect of using the proposed bending device is ensured by the possibility of producing new types of welded pipes (thick-walled, casing), reducing the time for transshipment and reducing the stock of the forming tool. The claims of the invention of a flanging device comprising a frame with two pairs of rolls arranged on it, installed with the possibility of vertical and horizontal movement and a change in the angle of inclination relative to the molding axis, characterized in that, in order to improve the quality of the edge shaping, the bottom of the pair of rolls is offset relative to the other mold axis. Sources of information taken into account in the examination of I. Author's testimony (1 USSR 579061, class B 21 C 37 / 06,18.07,75 (prototype). I J r - J Fig.Z / f.