SU1641486A1 - A die to manufacture hollow members - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to dies for obtaining full details with a variable cross section. The purpose of the invention is to increase productivity. A stamp for obtaining hollow parts comprises a step punch, a die g, a guide element in the form of a shaft with an axial bore, the hollow limiter is shifted by a punch with a through ozdial groove in the wall, as well as a puller When the punch is lowered, an ogled metal outflow occurs. whether the billet is in the gap formed by the interleaved element of the e-stamp 1 cf p-ly 2 ill.

Description

The invention relates to the processing of metals by pressure, in particular to die tooling for the manufacture of hollow parts.

The purpose of the invention is to increase productivity.

Figure 1 presents the stamp, a general view; Figure 2 shows the lower part of the stamp, a plan.

The stamp comprises in its upper part a support plate 1 connected to a press ram, on which case 2 is rigidly fixed, having a cavity of variable section. In the axial bore of a smaller diameter of the housing, a punch 3 is fixedly fixed, having the form of a rod of variable cross section with a flange, with the smaller diameter of the punch corresponding to the initial internal diameter of the workpiece and the larger diameter of the workpiece in the thinned part.

The transition from the smaller diameter of the punch to the larger is made conical.

Hs with a larger diameter of the punch 3 in the cavity of the housing 2 is mounted with the possibility of limited axial movement of the matrix 4, which in addition to the working part also has a guide part

The matrix 4 is spring-loaded relative to the body by the spring 5 being compressed, and its axial movement along the punch 3 os is limited by a lid 6 rigidly fixed to the top of the body 2

In the lower part of the stamp there is a limiter 7 fixed on the support plate 8. In the upper part of the limiter there is a through groove with a width equal to or slightly larger diameter of the workpiece, and the bottom has an axial hole with a diameter equal to the width of the groove or larger than the diameter of the processing flangeV ama

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part (in the case of a part with a flange at the bottom). A buffer mechanism in the form of a pusher 9 is placed in the axial hole of the limiter and the support plate, which has contact between the top end and the bottom of the workpiece, and the other with the buffer 10. In case the workpiece has a flange in the bottom part, an additional groove is made in the limiter 11 in width and in height, respectively, equal to the diameter and height of the workpiece, which serves as a stripper for the part from the punch 3.

For orientation of the workpiece, movable latches 12 are mounted in the stopper, spring-loaded springs 13 and moving along brackets 14 fixed on the stopper 7. For convenience of feeding the workpiece in the stamp, tray 15 is also fixed on the stopper 7.

A punch for obtaining hollow parts with a variable cross-section wall operates as follows.

The workpiece 16 is mounted on the tray 15, slides into the groove of the stopper 7, and is oriented with the clips 12.

When running the press ram down the punch

3 enters the cavity of the workpiece 1.6. During the further progress of the slider, the upper part of the workpiece passes through the working part of the matrix 4 and rests with its upper end on the tapered part of the punch 3. After that, the upper part of the workpiece (that part which has a smaller section) is distributed. The dispensing process takes place until the punch 3 with its lower end touches the bottom of the workpiece 16. In order to prevent the workpiece 16 from withdrawing downwards, the buffer 10 is tuned to a force somewhat greater than the dispensing force.

After touching the punch 3 bottom of the workpiece 16 the lower end of the matrix

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7 and the die stops, and the die 3, while continuing to move, pulls the upper part of the workpiece through the die 4. In this case, 5

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the external diameter of the part, and the internal cavity takes the configuration and dimensions of the punch. The excess metal formed during drawing increases the length of the part. The matrix, having a direction along the punch 3, does not have the possibility of radial displacement during the drawing process.

When drawing under pressure from the press slide, transmitted through the punch 3 and the bottom of the workpiece, the pusher 9 is lowered, compressing the buffer 10. After the matrix 4 is stopped during the drawing process, the spring 5 is compressed.

npts the return stroke of the ram press punch 3 rises. Together with it, lifts from the workpiece 16 and the pusher 9 under the action of the buffer 10. Part 16 rises up to the para n flange in the upper part of the groove 11, then stops. The pusher 9 and the buffer occupy the initial position, and the punch 3. continuing upward movement, leaves the cavity of the workpiece 16. With the slide moving upward, the matrix 4, under the action of the compressed spring 5. remains in place until the gap between the lower end of the die and the lid 6 is selected .. After that, the upper part of the stamp goes up and takes its original position. The workpiece 16 is pushed out of the clips 12 when the next part is installed.

Claims (2)

1. A die for obtaining hollow parts predominantly with a variable cross-section wall, containing a working tool in the form of a stepped punch and die with a guide element, a hollow limiter for moving one of the working tools, as well as a puller, characterized in that it is equipped with the buffer mechanism located in the specified limiter, the guide element of the matrix is made in the form of a shank with a hole coaxial with the working hole of the matrix, covering the punch along its side surface ited 2. A stamp according to claim 1, characterized in that the matrix movement restrictor is made with a through radial groove in its steak for inserting the preform into its cavity. 981 It / 91 12