SU1169785A1 - Method of manufacturing hollow cylindrical forgings - Google Patents

Abstract

THE METHOD OF MANUFACTURING A HALF CYDDRITTING FORCES, including installing a hollow billet on a mandrel, rolling it briskly with overlapping the entire height of the billet and correcting the resulting taper forging on the forging, characterized in that, in order to reduce the laboriousness of manufacturing, in the case of tapering, put in place in the inventory. the first of which is the forging roll part, striking the ring sections at a length equal to half the height of the forging from its larger diameter, with its fixation relative to the direction of alternating In the second stage they remove the fixation of the forging and roll out the second part of the forging by ring sections from the side of smaller diameter. cl

Description

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The invention relates to the processing of metals by pressure and can be used in the manufacture of hollow cylindrical forgings such as rings and shells.

The purpose of the invention is to reduce the labor intensity of manufacturing hollow cylindrical forgings.

FIG. 1 shows the position of the workpiece in the process of rolling until the appearance of taper; in fig. 2 - workpiece before correcting the taper; in fig. 3 - the same, after rolling with a part of the striker with annular sections on a length equal to half the height of the workpiece from the side of its larger diameter size; in fig. 4 - workpiece after correcting the taper.

Sewn billet 1 is placed on the mandrel 2 and rolled out quickly 3 with overlapping of its entire height until the appearance of taper.

After the appearance of the taper, the forging is moved to the rack 4 on the smaller diameter side and is partly rolled out in annular sections at a length equal to half the height of the forging on the larger diameter side, fixing it relative to the direction of movement (Fig. 2). When crimping half the height of the forging 1 of the die 3, the workpiece tends to tilt relative to the direction of movement of the die, but the stand 4 prevents this.

After completion of rolling, the forgings in the first stage remove the fixation of the forgings relative to the direction of movement of the striker by moving it to the center between the uprights and carry out rolling the ring sections of its second part from the side of smaller diameter. Appendix

Forming force on the second half of the height of the forging leads to a significant tilt of the forging and its return to the original vertical position, since in this case the struts do not prevent rotation.

Example. The forging of a flange with an outer diameter of 3685 + 36 mm, an internal diameter of 2910 + 36 mm, and a height of 1030 ± 36 mm is forged from an ingot with a mass of 57,000 kg on a hydraulic press of 15,000 ton-force. Material - steel 20, forging weight 36,800 kg.

In the first removal, the ingot is billetted to a diameter of 1,480 mm and a block is cut down with a length of 3,050 mm.

In the second removal, the block is upset to a height of 1010 mm, a hole is stitched with a hollow neck with a diameter of 700/400 mm and rolled out, the workpiece to an internal diameter of 1800 mm with a striking width of 1200 mm with overlapping of its entire height. The rolling stops at the time of the occurrence of taper. Next, the forging is moved to the stand from the side of a smaller diameter and is rolled by part of the striker with ring sections at a length equal to half the height of the forging from its larger diameter, with its fixation relative to the direction of movement of the striker.

After completion of rolling, the forgings in the first stage remove the fixation of the forgings relative to the direction of movement of the striker by moving it to the center between the pillars, and rolling the ring sections of its second part from the side of smaller diameter is essential. The application of a deforming force on the second half of the forging leads to a tilt of the forging, returning to the original, vertical position and elimination of the taper.

(Reg. 3

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Claims (1)

METHOD FOR PRODUCING HOLLOW CYLINDRICAL FORGINGS, including installing a hollow workpiece on a mandrel, rolling it briskly over the entire height of the workpiece and correcting the forged taper forging, characterized in that, in order to reduce the complexity of manufacturing, the taper forging is corrected in two stages, at the first of which the forgings are rolled out in part, the striker is in annular sections at a length equal to half the height of the forgings from the side of its larger diameter, with its fixing relative to the direction of movement oyka, and the second fixing step is removed and rolled forging annular portions of its second portion C * from the side of a smaller diameter. 4 ///// 7 // FIG. 1 1 1169785 2