SU1766563A1 - Method of ring production - Google Patents

Abstract

Use: in the production of cylindrical rings on half-open mills; Summary of the invention: the heated billet is precipitated; stitch the workpiece with a punch with the formation of the jumper and getting from its side a convex end surface. The bridge is removed by punching and rolled between the mandrel and the outer roll along its thickness and along its height between the tapered rolls, one of which is non-driven and the other driven, in the radial direction. When rolling, the workpiece is placed on the mandrel with a convex end surface facing the drive cone roll. The metal largely flows upward and forms, without rejecting, in geometry, the upper contours of the ring simultaneously with the lower ones. 2 Il.

Description

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This invention relates to the field of metal forming and can be used to make rings on ring rolling mills.

A known method of manufacturing ring products, in which the heated billet is sedimented, its punch is distilled to form a web, piercing is removed and the billet is rolled between the mandrel and the outer roller, and at least one of them is not radially driven

one.

The method does not provide for rolling the orientation of the sewn billet with respect to the deforming tool of the mill, which leads to a decrease in the quality of the products obtained due to the non-filling of the ring profile with a deformable metal in the junction zones of the outer side surface with the face plane of the ring.

The purpose of the invention is to improve the quality of the products obtained.

The goal is achieved in the method of making rings, in which the heating of the workpiece is deposited, pierced with a punch to form a jumper, removing the pier by punching and rolling the workpiece between the mandrel and the outer roller through its thickness and at its height between the tapered rollers, at least one of which is not driven in the radial direction, in which, according to the invention, when the workpiece is pierced with a punch, on the side of the jumper, a convex end surface is obtained, while the second tapered roll is made driven in the radial direction, and during rolling the workpiece is placed on the mandrel

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convex end surface facing the drive cone roll.

FIG. 1 shows the workpiece after the firmware; in fig. 2 - the initial stage of rolling the ring.

The method is carried out as follows.

The billet 1 is heated to the optimum temperature. The press is placed on the press table, it is upset to the height that determines the most optimal dimensions of the semi-finished product for subsequent piercing and rolling. As a rule, the dimensions of the workpiece 1 after precipitation are such that when the firmware is flashed, its end surface adjacent to the jumper 2. After the firmware, jumper 2 is removed in the workpiece and the hollow semi-finished product (Fig. 1) is again placed in the preheating furnace. Then, the semi-finished product 3 is removed from the furnace, turned over so that the end surface adjacent to the bridge 2 faces the upper conical roll 7 driven in the radial direction, and then placed on the mandrel 4 until it stops at the movable table 5 of the roll mill. The mandrel 4 with the table 5 and the semi-finished product 3 is brought together with the outer roller 6, simultaneously On the opposite side, the semi-finished product 3 is fed with tapered rollers 7, after which the last 3 in the center plane are compressed in height by the rollers 7 and the thickness of the roller 6 and mandrel 4 to form a ring .

During rolling, the working surface of the lower roll 7 is located in the same plane with the working surface of table 5, compression of the semi-finished product 3 in height is due to the vertical movement of the upper roll 7. In this connection, if the semi-finished product 3 is mounted on the mandrel 4 with a convex end surface, facing the table 5, when rolling the upper roll 7 will press the convex surface to the lower roll 7, and from the side of the outer roll 6 this surface will be further removed from the table 5. As a result, the neutral plane 8, on both sides of which the metal flows in opposite directions, will be displaced near the roll 6 from the center of the semi-finished product 3 closer to the convex end surface. The shaping of the semi-finished product 3 into the ring will be carried out mainly due to the design of the upper corner zones of the ring, whereas to obtain a ring with a regular geometric shape, a larger volume of the metal of the semi-finished product 3 must be shifted during rolling into the conjugation zones of the convex end surface with the lateral surface

rings, and the metal design of the annular corner portions of the transition of both end surfaces of the ring into the outer cylindrical surface must end at the same time, otherwise, i.e., from the side of the convex end surface adjacent to bridge 2, the corner portion will not be shaped to the final dimensions.

0 The above conditions will be met if, when fitting onto the mandrel 4, the semi-finished product 3 is placed with a convex end surface facing the upper drive cone roll 7.

5 Example. The product is a ring made of titanium alloy PT-ZV with dimensions # 1640 01448 х283 mm. The billet / 27410 934 mm was heated in a furnace up to 1000 ° C, besieged to a height of 360 mm in a hydraulic press with a force of 40 MN, and sewn

0 blind hole with a diameter of 250 mm, removed the jumper with a thickness of 30 mm at another position of the press table with a through hole, loaded into the oven with a temperature of 920 ° C, kept for 40 minutes,

5 then removed from the furnace, perekantovali 180 ° and planted on the mandrel roll mill. The convex end surface was located on top. The mandrel was brought into contact with the outer roll, two conical rolls were brought from the opposite side and in the automatic mode, according to the standard program embedded in the personal computer of the roll mill, rolled a ring of the required sizes. Next workpiece

5 mounted on the mandrel with a convex end surface facing the lower cone roll, as a result, neither in automatic mode nor in manual control, including a twofold increase in the operating rolling time, rolled the required dimensions of the ring and didn’t remove the metal in the zones formed by the sliding table and the lower part of the outer roll.

5 The product is a ring made of steel 40X with dimensions of 135 mm. Billet O0180 573 mm was heated to 1200 ° C, besieged to a height of 180 mm, a blind hole with a diameter of 250 mm was sewn, a jumper was removed with a thickness of

0 20 mm, mounted on the mill mandrel so that the convex end surface was facing the upper cone roll, after which a ring of the required dimensions was rolled in the auto mode. The next billet was fastened onto the mandrel, having a convex end surface at the bottom. As a result, when rolling in auto and manual mode, a defective ring was obtained (non-filling of the corner sections, as well as for tianovye

rings).

Claims (1)

The invention method of making rings, in which the heated billet is precipitated, pierced with a punch to form a jumper, removing the baffle by punching and rolling the billet between the mandrel and outer roll through its thickness and height between tapered rollers, at least one of which is not driven radial direction, t0 In order to improve the quality of the products, when the blank is pierced, a punch on the side of the jumper receives a convex end surface, while the second tapered roll is radially driven, and during rolling the workpiece is placed on a mandrel with a convex end face facing the drive cone roll. Ya / Ш2