RU1801660C - Readjustable bending lower die - Google Patents

Abstract

Usage: when bending sheet parts of complex curvature with a hem. SUMMARY OF THE INVENTION: the forming core of the matrix around its periphery is made up of removable custom sections mounted in sockets between the peripheral protrusions and mounted with the possibility of replacing them and adjusting the distance between them, and the middle part of the matrix is equipped with a central element with a working surface corresponding to the minimum bending radius, moreover, the Central element is mounted with the possibility of fixed movement in the horizontal plane and height adjustment relative to adjustable ktsy. This allows you to bend large parts and bend the edges without changing the tooling. 2 ill.

Description

ate

WITH

The invention relates to the processing of metals by pressure, in particular to tooling for bending sheet metal parts of complex curvature.

The aim of the invention is to expand technological capabilities by manufacturing asymmetric parts with pre-hemming.

In FIG. 1 shows a vertical section of a matrix; in FIG. 2 - the same, top view.

The reconfigurable matrix holds the base 1, sections 2, external 3 and internal 4 peripheral protrusions rigidly connected to the base 1, a set of embedded plates 5, the central element 6, the pads 7, the fixing screws 8. In FIG. marked: bending part - 9, punch - 10, the maximum distance between the forming sections is LI, the minimum distance, the radius of curvature of the working surface of the forming section is -R. The base of the matrix with peripheral protrusions is welded from sheet parts and its upper part is a two-wall box construction, the basis of which are the outer walls 3 and the inner walls 4 of the protrusions, the distance between which forms. nests for accommodating the forming sections 2 with fixing by the embedded plates 5. The central element 6, located inside the box-shaped structure, has a landing socket-hollow in its lower part. by means of which it is connected to the lining 7. Thrust power screws 8 through a threaded connection

00

about

(about

with the external protrusions 3 and their end parts, the central element b is fixed in a predetermined position. The design of the central element 6, due to the offset to one of the forming sections 2, allows bending of the edges of the workpiece and due to the pads 7 to limit the working stroke of the punch, which ensures the workpiece is punched over the central part of the punch.

. A stamp with a reconfigurable matrix works as follows. Depending on the given configuration of the detail. 9, the working surface of the matrix is adjusted: the forming sections 2 with the necessary radii R are selected, set at distances U and fixed by selecting mortgage plates 5, the height of the central element 6 is adjusted by selecting the lining 7 and the position of the central element 6 relative to the forming sections 2 by means of fixing screws 8. After adjustment, the workpiece 9 is laid on the matrix and bent by successive pressing. A plane-parallel fixed movement of the central element 6 is carried out using screws 8 with limits of movement up to half the diameter of the punch. The shape of the working surfaces of the punch 10 and the central element 6 is spherical with radii differing by the minimum thickness of the workpiece, which allows bending with radial compression to reduce the unevenness of the stress state in the metal of the workpiece. The bending or re-marking of the edges was carried out after the insertion of the middle part and, which reduces the eccentricities of the loads on the working parts of the equipment. The width of the workpiece can be any, as a rule, the width of the workpiece is greater than the width and length of the stamp, in this case, bending is carried out by successive pressing, starting from the middle of the workpiece. The orientation of the workpiece relative to the axes of the stamp can be arbitrary.

Example p. To produce a sheet of outer skin of an icebreaker with a thickness of 50 mm, dimensions 2x8 m of a sail-like shape with a radius of transverse curvature of 2.5 to 10 m and a longitudinal curvature of 40 to 160 m, a hydraulic press with a force of 800 tf and two bulky dies are required, which

are replaced by a reconfigurable matrix, saving a significant amount of metal and the labor involved in manufacturing these dies. The stamp (reconfigurable matrix) before flexible is configured as follows: two opposite custom sections 2 were set to the maximum possible distance of mm, the other two

sections perpendicular to the first were set to a smaller distance equal to

40

0.3 Li, i.e. , 3x800

 mm The above was obtained from the generally accepted dependences l i 8Rifi, l 2 8R2f2, where Ri and fi are the radius and deflection of the longitudinal curvature; R2 and f2 are the same of transverse curvature. Bending was carried out from the middle of the workpiece, first to one edge, then to the other. Using the proposed matrix allows for high-quality bending and hemming of the edges of large sheet metal parts.

Claims (1)

SUMMARY OF THE INVENTION A tunable bending matrix comprising a base with peripheral protrusions, symmetrically placed forming sections, a set of tiles mounted to be placed between respective protrusions and forming sections, a central element, as well as fixing screws installed in the holes of the protrusions, characterized in that in order to expand technological capabilities due to the manufacture of asymmetric parts with preliminary bending of the edges, it is equipped with sets of shaped their sections, the central elements and pads under the central elements of the cage is provided with additional projections, parallel and perpendicular imeyuschims, each formoobrazuyuscha. the section is mounted for placement between respective protrusions with the possibility of support on one of the protrusions, each central element is made with a curved working surface, and the fixing screws are mounted to interact with the side surfaces of the central element. 0 5 0 5 0