SU1636092A1 - Method for making axisymmteical parts with central hole - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular, to methods for producing axially symmetric parts with a central bore. The purpose of the invention is to increase the efficiency of the method by simplifying the design of the equipment used and tooling. The cylindrical billet is placed in the die space of the sedimentary equipment and sedimentation is carried out. The result is a semi-finished product 4 having an axial protrusion 5 and an axial recess 6. At the second transition, the semi-finished product 4 is installed in the roll matrix and fixed with a recess along its protrusion. At the beginning of rolling, the axial protrusion 5 is eliminated by displacing the curved metal into the body of the semifinished product. In the future, the formation of the part and the formation of a through hole. The method allows the use of equipment and technological equipment of a simpler design, provides for the reduction of peripheral scrap and, consequently, the consumption of metal. 2 Il. e (L

Description

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figure 1

The invention relates to processing. Ke metals are pressurized and can be used in the manufacture of parts such as disks with holes, for example, rings, crown gears, gear wheels with a screwdriver hub, circular stiffeners, mounted flanges, mold elements, etc.

The aim of the invention is to increase the efficiency of the method by simplifying the design of the equipment used and the tooling.

Fig, 1 shows a draft of a cylindrical billet; figure 2 - scheme of the mechanical rolling of the semi-finished product. i

The method is carried out as follows.

The cylindrical billet is placed in the die space of the sedimentary equipment with fixation in the axial recess 1 of the matrix 2. After the preform of the workpiece is sown by the punch 3, a semi-finished product 4 is obtained, having an axial protrusion 5 on one end surface, and on the other - an axial recess 6 roll matrix 7 and fix the recess 6 on the corresponding protrusion 8 of the matrix, which ensures the exact position of the semi-finished product 4 in the snap.

At the beginning of the rolling of the semifinished product 4 by the action of the punch 9 installed with a slope of 3-10 ° to the vertical, the axial protrusion 5 formed at the first transition is eliminated by displacing the metal of the protrusion 5 into the body of the semifinished product 4. As the punch 9 approaches the matrix 7, the metal moves to the periphery, filling the stream of the punch, while in the central zone additional tensile stresses appear, the contact stresses in the center of the semi-finished product 4 become below the yield strength of the material. The metal, under the action of tensile stresses, moves away from the surface of the protrusion 8 of the roll matrix 7, forming a hole. Then, the punch 9 and the roll matrix 7 are placed and the finished part 10 is removed from the matrix 7 by means of the ejectors 11.

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Considering that the perimeter of the metal rupture zone has an irregular shape, on the last transition (not shown), simultaneously with the operation, the peripheral rip pieces are cut out of the part 10.

Example. The method was tested on the installation of face rolling by rotating with a force of 100 tf at an angle of J 5 °, a tool rotation speed of 60 rpm, a feed rate of an inclined tool V 2 mm / s. Diameter of a ledge de 40 mm. Use the billet of steel 45 with dimensions D3 60 mm; Нь 60 mm. After rolling the workpiece by 50-60%, additional tensile stresses appear in the center of it, which first reduce the contact pressures from the side of the punch, and then lead to rupture of the central zone.

The proposed method allows to obtain axisymmetric parts with a central hole, using equipment and technological equipment of a simpler design, reduces the size of the peripherals30

foot burst metal.

and therefore the expense

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Claims (1)

Invention Formula A method of manufacturing axially symmetric parts with a central hole, consisting in face rolling of a cylindrical billet carried out simultaneously with the formation of a hole using technological equipment including upper and lower rolling tools, the hole being formed by displacing the metal central part of the semi-finished product into the body. its peripheral part, characterized in that, in order to increase efficiency by simplifying the design of the equipment used and technological equipment, before the end rolling, the billet is deposited to obtain an ocesoio recess on one of its end surfaces and an axial projection, on the other, with the lower rolling tool with a protrusion on the working surface corresponding to the recess of the prepared semi-finished product, before rolling 0 five fixing the semifinished product relative to the lower rolling tool with the help of the protrusions of the tool and deepening the semifinished product; the extrusion of the metal of the protrusion of the semi-finished product into the body of its peripheral part is watered, and the hole is formed by the upper rolling tool. eleven FIG. 2