SU682302A1 - Tool for pressing hollow parts - Google Patents

Description

one

The invention relates to the field of metal forming and can be used for pressing hollow articles.

A known tool for pressing hollow articles, comprising a conical needle, a ram and a conical die.

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However, its products are of low accuracy due to the increased transverse and longitudinal thickness variation.

Also known is a tool for pressing hollow articles, comprising a needle made in the form of two cylindrical stages associated with a conical junction, a ram and a conical die 2.

The main disadvantages of this tool include the fact that during continuous pressing the surface quality and accuracy of products deteriorate significantly, since the needle must be removed from the deformation zone before loading the next workpiece, and then, after loading, the B center is reintroduced, and the internal the surface of the workpiece, as well as the deviation of the initial position of the needle for the subsequent pressing cycle from the final one during the previous cycle. In addition, the need for the two described

operations lead to an increase in auxiliary time during pressing.

The aim of the invention is to increase labor productivity and product quality.

This goal is achieved by the fact that in a known tool for pressing hollow articles containing a two-step cylindrical needle with a conical transition between steps, a press shtampel with a central hole and a conical die, the needle is installed in the aperture of a ram along a sliding fit, and the conical transition between the needle steps made of the same length has a taper angle smaller than the taper angle of the matrix.

The tool is provided with a stop interacting with a needle, mounted in the central hole of the press shtam with the possibility of adjusting axial displacement.

The tool ensures reliable withdrawal of the needle along the pressing axis to the rearmost edge; under pressure of pressing it is applied to an uncompensated area enclosed between the cylindrical surfaces and equal to the difference of the areas of these needle cylinders.

For the smallest metal consumption, in the manufacture of the tool, the cylindrical steps of the needle are made of the same length L. The tapered transition is made with a taper angle smaller than the taper angle of the die to create a guaranteed uncompensated platform at the beginning of pressing the first workpiece.

The drawing shows schematically a tool for pressing hollow articles, a slit.

The pressing tool consists of a needle 1 with steps, a die 2 with a point 3, a ram 4 having a central cylindrical opening at the working end of the needle 1 and a threaded section for installing the stop 5, fixing the needle 1 in the extreme position. The stop has the possibility of adjusting the axial movement along the thread.

The tool works in the following sequence.

Before the start of pressing, the needle is inserted into the die point of the die with a larger diameter step into the hole of the hollow pressing shtamp.

At the initial moment of pressing, the press-stamp, having made a working stroke, creates through the pressed metal a hydrostatic pressure on the tapered needle transition, under the action of which the needle moves into the opening of the press-clamp in the direction opposite to the movement of the press-clamp to the stop, after which synchronous movement of the press-clamp begins and needles in the direction of the metal flow into the gap between

SUNGLASS matrix and a step of smaller needle diameter. After the extrusion is completed, the press shtampl is retracted to the rearmost position, while the needle is held by the under-pressed part of the workpiece in the die point.

After submission to the deformation center of the subsequent billet, the pressing process is repeated.

Claims (2)

1. A tool for pressing hollow articles, comprising a two-step cylindrical needle with a conical transition between steps, a press shtamp with a central hole and a conical die, characterized in that, in order to increase the productivity and quality of the products, the needle is installed in the hole of the shred press a sliding fit, and the conical transition between the needle steps, made of the same length, has a taper angle smaller than the taper angle of the die. 2. The tool according to claim 1, characterized in that it is provided with a needle interacting with a needle, mounted in a central opening of a press shtam with the possibility of adjusting axial movement. Sources of information taken into account in the examination 1. Zholobov V.V. et al. Metal pressing, Metallurgists, Moscow, 1971, p. sixteen. 2. Zholobov V. V. and others. Metal pressing, Moscow, Metallurgists, 1959, p. 456.