RU2261768C1 - Bending-gag roller press - Google Patents

Abstract

FIELD: plastic metal working.

SUBSTANCE: invention relates to manufacture of elements of shells of welded structures. Proposed press contains bed made in form of two frames crossmembers arranged between frames and carrying upper and lower pressing tools. Upper deforming tool is made in form of roller, being mounted on rod of power drive for reciprocating in vertical plane towards lower crossmember. It can also reciprocate along crossmember. Lower deforming tool. Upper and lower deforming tools are made with minimum radii of rounding off of working surfaces.

EFFECT: enlarged capacity owing to minimization of deforming forces.

3 cl, 1 tbl, 4 dwg

Description

The invention relates to the processing of metal sheet blanks by pressure, namely, universal devices for bending and straightening sheet parts. The invention can be used for the manufacture, in particular, of lining elements for ships and ships, as well as other sheet structures of complex shape.

Known and widely used for bending and straightening press sheets and rollers using methods of free and constrained transverse bending. When using equipment made according to these technical solutions, considerable efforts are required (up to 8000 tf), of which 10-90% is spent on the elastic aftereffect: springing the metal and creating a field of residual stresses in the cross sections of the workpiece. High values of the required capacities lead, respectively, to the large capital, material and energy intensity of the equipment used (see Alexandrov V.L., Gorbach V.D., Kuklin OS, Shabarshin V.P. High Technologies for Bending and Editing. " Bulletin of Shipbuilding Technology ”, 1996, No. 4).

At the same time, bending and leveling machines (rollers) using rotational deformation methods and made using such patented technical solutions as, for example, a.s. USSR No. 1794532 of 12/07/92 and 1803222 of 03/23/93, are already 3-4 times more productive than presses, although they also require high power (up to 5,000 tf) and maintaining workpieces with cranes and swing tables. In addition, these machines have significant dimensions and weight (up to 2000 tons) and do not provide bending of the edges of the workpieces.

The noted drawbacks of traditional bending and leveling equipment are eliminated by the use of bending-leveling machines and machines on the principles of mini-force stampless rotational-local deformation (RLD), see, for example, RF patents Nos. 2102170, 2129929 and 2191082.

The closest in essence to the claimed invention is a multifunctional bending machine, containing a bending machine, the technical solution of which is available in the patent of the Russian Federation No. 2129929 and which is adopted as a prototype. The roller press of this machine contains a bed made in the form of two frames, two positioners to support the workpiece at its ends, placed between the frames of the beam, respectively bearing the upper and lower deforming elements. The upper element is made in the form of a roller and mounted on the rod of the power drive with the possibility of reciprocating movement in a vertical plane towards the lower beam and the possibility of reciprocating movement along the beam, and the lower deforming element is made in the form of two support beams installed with the possibility of interaction with the upper deforming element, while the total curvature of its working surface is greater than the total curvature of the rounding of the working surfaces of the supporting beams in the butt echnom section.

The objective of the present invention is to expand the technological capabilities of bending equipment and increase its productivity, and this problem is solved by minimizing deforming efforts.

The specified technical result is achieved provided that the proposed bending-correct roller press has the following distinctive features from the prototype:

- the upper and lower deforming elements are made with the smallest possible radii of curvature of their working surfaces, selected from the condition that there is no crushing of the working surface of the deforming elements and the allowable deformation of the workpiece during shaping;

In addition, in particular cases of the specified technical solution of the inventive roller press, there are such distinguishing features as:

- the upper and lower deforming elements are made in the form of quick-release rollers;

- quick-release rollers are made with different radii of curvature transverse to the workpiece, not exceeding the attainable radius of curvature of the workpiece in the transverse direction, taking into account the springing of its material.

The reduction to the minimum possible radius of curvature of the working surfaces of the deforming elements minimizes the deformation forces due to the reduction of the contact spot of the tool with the workpiece and, therefore, the reduction of the zone of plastic deformation. The criteria for reducing the radius of curvature is the exclusion of plastic crushing of the working surface of the deforming elements, for which they are made of materials with a yield strength of 2-2.5 times greater than that of the workpiece metal being processed, and thinning of the workpiece is allowed up to 10% of its thickness. The noted empirical values were obtained from the operating experience of MGPS machines operating on the principles of rotational-local deformation, and are confirmed by the research conducted by FSUE TsNIITS (report on research GKLI.3210-090-2002).

The following dependencies were established between the radii of curvature of the working surfaces as a result of theoretical and experimental studies, which ensure the effectiveness of the application of rotational-local deformation processes:

- радиусы кривизны верхнего деформирующего элемента соответственно в поперечном и продольном направлении по отношению к линии гиба;Where

- the radii of curvature of the upper deforming element, respectively, in the transverse and longitudinal directions with respect to the bending line;

- радиусы кривизны нижнего деформирующего элемента соответственно в поперечном и продольном направлении по отношению к линии гиба.

- the radii of curvature of the lower deforming element, respectively, in the transverse and longitudinal directions with respect to the bending line.

Moreover, the dependence (1) is valid only with the following relationship:

The upper and lower deforming elements can be made in the form of quick-detachable rollers with different radii of transverse curvature, which are selected as close as possible to the required radius of the workpiece, taking into account the spring, which can be calculated for hull steels and alloys according to the known dependencies given in the industry standard shipbuilding RD5 .95079.

The essence of the invention is illustrated by the following drawings:

figure 1 is a General view of the bending-straightening roller press;

figure 2 - power unit top;

figure 3 - power unit lower;

figure 4 - scheme of rotational-local deformation (a - bending by roller on a roller; b - bending by roller on a double-beam; c - bending by rolling by roller on a roller; d - bending by rolling on a rigid beam.

The press brake (Fig. 1) contains a frame made in the form of two frames 1 and 2, traverses 3 placed between these frames, supporting upper 4 and lower 5 power units, respectively, and may also contain support rollers 6, a hydraulic station 7 and a remote control 8 controls with operator's seat. The upper deforming element is made in the form of a roller 9 (Fig. 2) and mounted on the rod 10 of the upper power unit (carriage) 4 with the possibility of reciprocating movement in a vertical plane towards the lower beam and the possibility of reciprocating movement along the upper beam. The lower deforming element 11 (figure 2) can be made in two versions: in the form of support beams 12 (figure 4) or the drive roller 11. The drive roller 11 using the lower drive carriage 5, and the upper pressure roller 9 using the upper drive carriages 4 can move along the lower beam and exit on their console, where they can be replaced. To ensure bending on the drive lower roller 11, the support beams 12 are inoperative outside the working area, they are moved in and out progressively using the lower carriage 5.

) и соответственно нижнего

. Наиболее рациональные соотношения указанных параметров приведены выше в выражении (1).The effective application of the basic methods of rotational-local deformation carried out at the machining center depends on the curvature of the working surfaces of the deforming elements (Fig. 4), the radii of curvature of the working surfaces of the upper deforming element in the transverse and longitudinal directions (

) and, accordingly, the lower

. The most rational ratios of these parameters are given above in expression (1).

An experimental model of the automatic bending machine AGPM-15M, containing a bending machine, has been designed and tested. It is tested in the manufacture of a number of experimental and standard bent parts of various shapes with a thickness of 2 to 5 mm for a number of products of modern technology.

Working design documentation was developed for the AGPM-25 machine, which will allow bending and straightening of sheet metal with a thickness of 2 to 20 mm and dimensions up to 2800 × 10000 mm.

The main characteristics of the bending equipment are given in comparison with foreign analogues in the table.

Thus, the bending and correct press as part of the AGPM-25 machine, compared to the best foreign counterparts, allows, thanks to minimizing bending and dressing efforts:

- replace hydropresses and rollers with technological capabilities of 20-40 times more power;

- significantly reduce the material consumption of the processes due to the exclusion of stamping and control equipment;

- increase the productivity of the shaping process.

Claims (3)

1. A bending-and-right roller press containing a bed made in the form of two frames, placed between the frames of the traverse, respectively bearing the upper and lower deforming elements, the upper of which is made in the form of a roller and mounted on the rod of the power drive with the possibility of reciprocating movement a vertical plane towards the lower traverse and the possibility of reciprocating movement along the traverse, while the lower deforming element is made with the possibility of interaction with the upper ormiruyuschim element, characterized in that the upper and lower deformation elements are made with a minimal radius of curvature of the working surfaces, chosen from the condition of absence buckling deformation elements of the working surface and the allowable deformation of the workpiece. 2. Press according to claim 1, characterized in that the upper and lower deforming elements are made in the form of quick-release rollers. 3. The press according to claim 2, characterized in that the quick-release rollers are made with different radii of curvature transverse to the workpiece, which should not be greater than the radius of curvature of the workpiece in the transverse direction, taking into account the springing of its material.

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