RU2624882C2 - Method of manufacturing ring - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: workpiece of a closed shape with a central slit is cut from the metal plate. Herewith the outer surface and the surface of the central hole are equidistant. The workpiece is located between the bending and thrust rollers of the roll forming machine and its individual sections are bent with increasing or decreasing its curvature radii.

EFFECT: increasing the accuracy of the parts.

4 cl, 6 dwg

Description

The invention relates to the processing of metals by pressure and can be used in mechanical engineering for the manufacture of parts such as a ring, mainly large sizes.

There is a method of manufacturing frames, in which the initial profile blank is bent by rolling in rollers on three- or four-roll forming machines in a ring with a junction (Groshikov A.I., Malafeev V.A. Procurement and stamping work in aircraft construction. M: Engineering, 1976 g., p. 334 ... 342). After bending, the joint of the ring is welded by fusion welding, flash butt welding, electron beam welding or laser welding. The welded rings are machined to obtain the required dimensions. In the manufacture of frames of large diameters and large sections, the profile billets are bent into half rings, which are welded together at the end joints in a ring. The remaining operations are performed similarly.

The disadvantage of this method of manufacturing frames is the presence of welds, which not only reduce the strength of the finished ring, but also significantly increase the complexity of its manufacture due to fitting, welding, finishing and control operations, and also require the use of a whole range of additional equipment.

For a closer analogue to the proposed method, the method of manufacturing a ring according to the patent of the Russian Federation No. 2468884, class. BK 1/76; B21D 53/16. The method includes the steps of cutting the starting material to a predetermined length and making a slot in it in the direction of its length to form a preform. The workpiece is inserted into tooling and the slot is expanded by pressing the punch into the workpiece while applying a compressive force to the ends of the workpiece. The slot is expanded by the introduction of a punch to obtain a round billet. The workpiece is additionally supported in a direction normal to the compressive force applied simultaneously. Radii can be cut at each end of the slot. The molded workpiece is removed from the tooling and perform the final processing to the final size and shape of the ring. The workpiece is additionally supported to prevent axial deformation normal to the direction of expansion of the slot.

The disadvantage of the above method is the low accuracy of the resulting ring, small technical and technological capabilities.

This is explained by:

- the desired shape of the ring is obtained by expanding the slot in the workpiece by pressing a punch into the workpiece while applying a compressive force to the ends of the workpiece. To achieve the desired result, i.e. to press the punch into the workpiece, the edges of the workpiece must rest on something. As a result of the combined action of the punch and the support, a bending moment occurs, which violates the flatness of the ring, and the simultaneous application of compressive force to the workpiece further exacerbates this undesirable phenomenon, which does not allow to obtain an exact flat ring and requires additional editing to remove it after removing the ring from the punch;

- the implementation of this method requires a special complex stamp with movable support elements, since when lowering the punch the workpiece shape is constantly changing, while the movable support elements should not impede the punch when it passes through a deformable ring. The creation of such a stamp is a complex technical task, which is even more complicated in the manufacture of rings of large diameter, for example, rings with a diameter of several meters;

- for the formation of large-sized rings, special press equipment is required: a large-sized press with table sizes exceeding the dimensions of the stamped ring. Such a press is a unique and expensive equipment requiring high costs;

- to obtain each diameter of the ring requires an individual punch, which significantly increases the cost of technological equipment;

- does not allow the manufacture of rings from shaped blanks. The problem solved by the invention is the expansion of technical and technological capabilities, improving the accuracy of the resulting parts such as a ring.

Technical result achieved: production of rings, mainly with a diameter of more than 3 m, with minimal costs on universal equipment using universal technological equipment and with sufficient accuracy.

The problem is solved in that in a method of manufacturing a ring, including cutting from a raw material of a preform of a closed curly shape with a central slot, expanding the specified slot to obtain a part of the desired shape, use a metal plate as the starting material, the central slot is cut out equidistantly from the outer surface of the workpiece, and the Central slot of the workpiece is expanded by bending and thrust rollers of a roll forming machine, between which the workpiece is placed, and bending of individual sections of the workpiece with an increase or decrease in its radius of curvature.

In addition, the task is solved by the fact that bending is carried out in several transitions with intermediate heat treatments to remove residual deformations.

And also carry out the bending of the heated workpiece.

In FIG. 1 shows a blank of a closed curly shape with a straight and curved section, before the bending operation, FIG. 2 - a variant of the workpiece, before the bending operation, FIG. 3 - the position of the bending rollers when bending straight sections of the workpiece, FIG. 4 - the position of the bending rollers when bending curved sections of the workpiece, FIG. 5 - finished ring after bending.

A method of manufacturing a ring is as follows.

From the source material - a metal plate by known methods of cutting, for example, by laser cutting, a blank 1 of a closed figured shape with equidistant outer 2 and inner 3 surfaces is cut. The resulting workpiece 1 is placed between the bending 4 and resistant 5 rollers of the roll forming machine and its individual sections are bent, increasing or decreasing the radius of curvature of the workpiece.

The bending process to obtain parts such as a ring from a blank cut from a plate with a rectilinear 6 and curvilinear 7 section is as follows.

The roll forming machine drives the rollers 4 and 5 into rotation, and when the roller 4 approaches the rollers 5, the rectilinear section 6 of the figured ring 1 is bent. The rollers 4 and 5 reverse the rotation, and when the roller 4 approaches the rollers 5, the curvature of the bent section gradually increases to required size.

The bending of curved sections 7 is performed in a similar manner. In this case, when approaching the bending roller 4 with two thrust rollers 5, the curvature of the curved sections 7 decreases.

An example implementation of a method of manufacturing a ring.

A blank in the form of a figured ring is made from a thick aluminum plate with a length of 5 m and a width of 2 m, a ring with a diameter of 3.9 m can be made flexible using the proposed technology. . 2, after bending in the manner described, it is possible to produce a ring with a diameter of 4.2 m.

Thus, the proposed method allows the manufacture of large rings with sufficient accuracy, on universal equipment, using universal technological equipment.

Claims (3)

1. A method of manufacturing a large-sized part such as a ring, including cutting a closed-shaped preform blank from a metal plate with a central slot, an equidistant outer surface of the workpiece, placing the workpiece between the bending and thrust rollers of a roll forming machine and expanding the central slot by bending individual sections of the workpiece with said rollers with increasing or reducing the radii of curvature of these sections to obtain the desired shape of the part. 2. The method according to p. 1, characterized in that the bending is carried out in several transitions with intermediate heat treatments to remove residual deformations. 3. The method according to p. 1, characterized in that they carry out the bending of the heated workpiece.

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