SU1174115A1 - Die for producing sharply curved branches - Google Patents

Abstract

1. IGGUMP FOR MANUFACTURE OF CRUSHLY-FOGGED TORQUES, containing bending and gauge briquettes, the working surfaces of each of which are formed by the working surfaces of conjugating changing elements and with and with TeMj that, in order to make it possible to obtain equal strength equal bends, the radius of the bend will be radius flexible. diameters, the cross-section of the bending brook is made in the form of an equilateral coal, and with a rounding at the top in one of its shaping elements, conjugated with a semi-ellipse m, made in another element, and the cross section of a calibration stream is in the form of an oval formed by semi-oval, cross sections of the streams of its constituent elements, with the major axis of the oval located in the plane of the longitudinal symmetry (a die of equidistant distance of its connector with a smooth change its size from the middle of the stamp to the ends to a value equal to the small axis of the oval. 4 SP

Description

2. A stamp in accordance with claim 1, characterized in that the plane of the connector of the form-changing elements of the calibration stream is offset relative to the plane of symmetry of the working

its cavities are formed by the surfaces of the protrusions and depressions, which are made on the parts of these elements facing one another.

one

The invention relates to the processing of metals by pressure, in particular to the design of dies for the manufacture of steep-curved, bends.

The aim of the invention is to provide the possibility of obtaining equal-strength equal-pass bends with a bend radius of less than one and a half diameters.

FIG. 1 shows a two-strand stamp, top view; in fig. 2 - section A-A in FIG. 1, (before bending and after bending of the workpiece); in fig. 3 shows a section in FIG. 2 (at the beginning of the bending process); in fig. 4 - the same (at the end of the bending process); in fig. 5 is a section through BB in FIG. 1 (at the beginning of the crimping process) 5 in FIG. 6 - the same (at the end of the crimping process); in fig. 7G-section (at the end of the part crimping process).

The stamp contains bending punch 1, matrix 2 and gauge top 3 and bottom 4 semi-matrices fixed respectively on top 5 and bottom 6 plates. The working surface in the transverse radial section of the bending punch 1 is filled in the form of an equilateral angle with rounding at the apex of r and adjacent to the semi-ellipse of the bending matrix 2 (Fig. 4), and the calibration brook is in the form of an oval formed by the semi-oval cross-sections of the creeks of semi-matrix 3 and 4, at the same time, the major axis of the oval A. is located in the plane. the longitudinal symmetry of the stamp is equidistant to the plane of its connector (Fig. 6) with a smooth change in its size from the middle of the stamp to the ends to a value equal to the minor axis of the oval b (Figs. 1, 6 and 7). The radius of rounding at the apex 1 of the profile of the bending creek of the punch 1 is in the range from half of the outlet diameter at the ends D to the half of the diameter of the original tube stock. The major axis of the oval A of the calibration semi-matrices 3 and 4 is taken from the condition of providing an equal-in inner cross-section of the outlet with a diameter of cfg and equal strength of the walls along the small 5, - and outer 5 forming the outlet.

In addition, the planes of the connector of the calibrating semi-matrix 3 and 4 are offset relative to the plane of symmetry of the working surfaces 7 and are formed by the surfaces of the protrusions 8 and the cavities 9, made on facing 5 one to another of the parts mentioned. elements (Fig. 5). The original tube billet 10 with an outer diameter B and a thickness of 5 ° is modified in the process of stamping into a curvilinear blank 11 and into a ready-made tap 12.

The stamp works as follows. The upper part, the punch, the punch 1, the half-matrix 3 and the upper plate 5, 5 fixed on the slider of the press are in the upper initial position. The heated billet 10 is placed in a stream of bending matrix 2 (Fig. 2). When the press 0 slider moves down the side of the angle of the bending creek, the punch comes into contact with the middle part of the workpiece (Fig. 3) and begin to ovalize it in the plane of longitudinal symmetry up to 5 contacts with the working surface of the punch along radius P. With further downward movement of the punch, the billet is bent with ovalization of the outer part along the large forming part of the billet until the bending pair of tools closes (Fig. 4). By moving the press ram up, the upper part of the stamp is returned to the upper position, the curved workpiece 11 is shifted to the lower calibration half-matrix 4, turning it 90, and the orientation311

The axis of the shaft is parallel to the direction of the working stroke of the tools (FIG. 5). By re-moving the press ram down, the workpiece is calibrated with semi-matrix 3 and 4. The calibration process proceeds continuously in two stages. Initially, the ovality of the workpiece is straightened until it is fully adhered to the working surface of the calibrating semi-matrices, at this moment the protrusions 8 are in the same plane or partially injected into the grooves 9. With the further approach of the semi-matrix, the workpiece is crimped to the finished part 12 (Fig. 1, 6 and 7). By returning the press ram, the calibration hemispheres are opened upwards and the finished part is removed from the die.

154.

For the manufacture of new parts, the process is repeated, with the bending and roasting of the blanks can be combined.

The use of the proposed punch design for the manufacture of steep-curved bends ensures crawling of equal-strength equal-pass bends with a bend radius of less than one and a half diameters due to an increase in the quality of the concave surface during bending of the workpiece and rational redistribution of the metal in calibrating semi-matrix during the crimping. The variability of the cross section of the calibrating stream and the specificity of the connector of the semi-matrix allows you to control the quality of manufacture of steeply bent bends.

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FIG.

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Claims (2)

1 . PHGAMP for the manufacture of bent bends, containing bending and calibration streams, the working surfaces of each of which are formed by the working surfaces of the interfaced forming elements, characterized in that, in order to ensure the possibility of obtaining equal strength equal bends with a bending radius of less than one and a half diameters, the stream is made in the form of an equilateral angle with a rounding at the top in one of its forming elements, paired with a semi-ellipse, in the other element, and the cross section of the calibration stream is in the form of an oval formed by semi-ovals, the cross sections of the streams of its constituent elements, while the major axis of the oval is located in the plane of longitudinal symmetry of the stamp is equidistant to the plane of its connector with a smooth change of its size from the middle stamp to the ends to a value equal to the minor axis of the oval. SU „1174115 Figure 1 2. The stamp on π. 1, distinguish-. its cavities are formed on the surface with the fact that the planes with the protrusions and hollows, the udders of the shape-changing elements calibrated on one of the roving streams, are displaced relative to the other parts of the working symmetry plane indicated elementarily. comrade