SU1544519A1 - Set of rolls for sheet-bending machine - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to equipment for the manufacture of articles such as pipes and sheet shells by plastic bending when passing through bending rolls. The purpose of the invention is the expansion of technological capabilities through the manufacture of products with a double curvature surface. The set of rolls of the sheet bending machine contains two rolls. One roll consists of a rod 1 with an elastic coating 2, made with a modulus of elasticity variable along the roller, and the elastic coating 2 can be made in the form of a set of rings of material with different elastic moduli. The other roll 5 is made of rigid material. In the process of passing the sheet blank between the rollers installed in the sheet bending machine, various elements of the workpiece under the action of a rigid roll 5 embedded in an elastic coating 2 by the amount H, undergo various plastic bending depending on the elastic modulus of that part of the coating 2 that participates in the bend this workpiece item. As a result of the passage of the sheet blank in the rollers of the proposed complex, it is possible to obtain articles of the type of pipes and shells with forming in the form of curves. The device can be used to simultaneously manufacture several different parts. 1 hp f-ly, 4 ill.

Description

The invention relates to the processing of metals by pressure and can be used for the manufacture of a product such as pipes and shells of complex shape.

The purpose of the invention is the expansion of technological capabilities through the manufacture of products with a double curvature surface.

Figure 1 shows a set of rolls, one of which is provided with an elastic coating; Figure 2 is the same for the case of precast elastic coating; Fig. 3 shows an example of a plot of the distribution of the modulus of elasticity along the length of the roll barrel (a solid line corresponds to a change in the elastic modulus in the case of a monolithic elastic coating, and a dotted line corresponds to a change in the elastic modulus in the case of a precast elastic coating); Fig. 4 is the same for a roll intended for the manufacture of several products of different curvature.

The set of rolls of the sheet bending machine has two rolls with parallel longitudinal axes: one roll consisting of a rigid rod 1 with an elastic coating 2; moreover, the coating can be made by assembling, for example, from several rings 3, pressed onto metal bushings 4 fixed to the rod 1 and another roll 5 made of rigid material.

A set of rolls works as follows.

After installing the kit in the machine frame and communicating to the rollers a pressing force directed in the plane passing through the axes of both rolls (necessary for inserting h roll 5 into the coating 2) and sending rolls in different directions between the rollers, sheet blanks are set between the rollers. Sheet blanks, the passage between the rollers, undergo plastic bending, and their various elements bend by a different amount depending on the elastic modulus of the elastic coating of the roll, by which this element of the workpiece is deformed. The greater the modulus of elasticity of the material of this portion of the elastic coating, the smaller the radius of the curve

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This item will be received by the item processed by this area. As a result, on a set of rolls, you can get products such as shells and pipes with Double Curvature walls (i.e., with a curvilinear generator).

In addition, the fabrication of an elastic coating for teams of individual rings consisting of an elastic material with different elastic moduli (the diagram of which is shown in Fig. 4) makes it possible to simultaneously obtain various products on a bending machine that differ in curvature, which further expands the technological capabilities devices.

Example. A set of rolls of the sheet bending machine is made in the form of a hard roll with a diameter of 190 mm and a roll with an elastic coating with a diameter of 250 mm (from polyurethane of the SKU-7l and SKU-PFL types), whose elastic modulus varies from 20 MPa in the middle to 40 MPa at the ends. The force is reported to press the rolls before the hard roll is inserted into the elastic coating to a depth of 2.5 mm.

When machining flat sheet blanks made of AMgb alloy with a thickness of 1.5 mm, barrel-type products 500 mm long with a curvilinear generatrix were obtained, having the largest radius in the middle part of 240 mm and the smallest radius along the edge of 210 mm.

The proposed roll set design expands the range of technological capabilities, allows for obtaining parts of different curvature, and allows you to simultaneously receive different parts on one set.

Claims (2)

1. The set of rolls of the sheet bending machine, which includes a roll with an elastic coating, is different from the fact that, in order to expand technological capabilities by manufacturing products with a double curvature surface, the elastic coating of the roll is made with a variable modulus of elasticity along the generatrix. 2. The kit according to claim 1, about tl and - due to the fact that the elastic coating of the roll with variable along 1 Ј (MPa) E (NPA) Coating length L (FIM) fie-b Fig.b L (MM)