RU120023U1 - DEVICE FOR MANUFACTURING FLAT RINGS - Google Patents

Abstract

A device for the manufacture of flat rings from an oval blank with an oval hole, containing a clamp, stretching slides with protrusions with a height equal to the thickness of the blank, and adjustable stops on the outside of the ring, characterized in that it is equipped with additional adjustable stops made to ensure location in the oval hole an oval blank at a distance equal to the diameter of the resulting flat ring, with the possibility of sinking at the initial moment, when the oval hole in the oval blank is less than their diameter, and extension by means of springs when the oval blank is stretched and its hole enlarged.

Description

The utility model relates to the processing of metals by pressure, and in particular to devices for making rings.

A device for the manufacture of flat rings from a prefabricated oval billet with an oval hole [Copyright certificate, SU, No. 1687343 A1, class. B21D 53/16, publ. 1991].

The disadvantages of this device are: low quality products, the complexity of the implementation and the possibility of rapid loss of stability of the workpiece.

The closest analogue is a device for the manufacture of flat rings from a prefabricated oval billet with an oval hole [Utility Model Patent, RU, No. 111785 of 07/11/2011, publ. 12/27/2011], which contains a clip, tensile crawlers with protrusions and adjustable stops located on the outside of the ring with a height of the said protrusions equal to the thickness of the workpiece.

The disadvantages of the device is a possible distortion of the shape of the ring due to loss of stability and the reverse flow of metal into the cavity of the ring under tension (see figure 1).

The objective of the utility model is to obtain improved ring quality, metal economy, reliability and productivity during the stretching process.

This is achieved due to the fact that the device for the manufacture of flat rings from a pre-prepared oval billet with an oval hole, contains a clip, stretching crawlers with protrusions and adjustable stops located on the outside of the ring with a height of the protrusions equal to the thickness of the workpiece. In this case, when the oval billet is stretched, additional adjustable stops are installed in its oval hole, preventing the billet from bending backward. Additional adjustable stops are made to ensure that the oval billet is located in the oval hole at a distance equal to the diameter of the obtained flat ring, and can be recessed at the initial moment when the oval hole in the oval billet is smaller than their diameter, and extended by means of springs when the oval billet is stretched and increasing its oval hole (see figure 2).

The utility model is illustrated by the following drawings:

- figure 1 shows a flat ring obtained by tension without internal adjustable stops;

- figure 2 presents a flat ring obtained by tension with additional adjustable stops located inside the oval hole;

- figure 3 presents a device for the manufacture of flat rings and other hollow parts (rectangle, square, oval, etc.) from sheet metal with a high utilization of metal with additional adjustable stops 5 located inside the oval hole;

- figure 4 presents the same device, but using additional adjustable stops 5, made with the possibility of recessing them at the initial moment when the oval hole in the oval billet is smaller than their diameter, and extend them using springs 7 when stretching the oval billet and increasing holes.

The design of the device consists of a plate 1, stretching creeps 2, adjustable stops 3, clamp 4 and additional internal adjustable stops 5, made with the possibility of recessing them at the initial moment when the oval hole in the oval billet is smaller than their diameter, and extend them using springs 7 when stretching an oval billet and increasing the hole.

In the upper position of the press slider, the clamp 4 fixed to the shank (or top plate) (not shown conditionally in the figure), which in turn is connected to the press slider, is in the upper position. The stretching crawlers 2 are reduced to the center.

In the lower position of the press slider, the clamp 4 rests on the adjustable stops 3. Between the clamp 4 and the plate 1 there is a gap equal to the thickness of the stretched oval blank 6 with the possibility of its free movement. Crawlers 2 are bred (from the wedge device, hydraulic cylinders, etc.) in opposite directions and stretch the oval billet. In this case, the oval billet due to the adjustable stops 3 gets the desired shape, for example, a circle (shown by a dashed line), and additional stops 5 prevent distortion of the shape of the flat ring due to loss of stability and backward flow of metal into the cavity of the flat ring.

When moving upward, the sprockets 2 are reduced by springs to their initial position and the oval blank 6 is freely removed.

Compared with the usual cutting of such flat rings from a sheet, the device provides a reduction in metal consumption up to 50% and higher.

The design of the device allows you to install it on a conventional hydraulic press equipped with additional horizontal hydraulic cylinders, automatic loading of oval blanks and removal of finished parts. Instead of a hydraulic press, you can use a conventional crank press. In this case, the stretching and compression movements can be carried out, for example, from wedge devices operating from a press slider. Using this device, you can get both flat rings and hollow flat parts of a different shape.

Claims (1)

A device for the manufacture of flat rings from an oval billet with an oval hole, containing a clip, stretching creeps with protrusions of a height equal to the thickness of the billet, and adjustable stops on the outside of the ring, characterized in that it is equipped with additional adjustable stops made to ensure location in the oval hole oval billet at a distance equal to the diameter of the obtained flat ring, with the possibility of recessing at the initial moment when the oval hole in the oval billet is smaller their diameter, and extension by means of springs when stretching an oval billet and increasing its hole.