CS224368B1 - Flangeless shell drawing apparatus - Google Patents

Abstract

The object is, on an apparatus for the production of drawn parts without a flange, in particular triple-acting presses with controlled movement of the drawing punch and of the drawing cushion in relation to the drawing die, to provide an apparatus by means of which it is possible to remove the resulting flange before the drawn part is drawn through the drawing die and to obtain a drawn part without a flange and with a straight rim in a single operation or with a single insertion of the sheet-metal blank, this leading to a reduction in manufacturing costs and the costs involved in the preparation work with such drawn parts. The invention solves the object by virtue of the fact that the rim of the drawing edge of the drawing die is formed by a round cutting edge which is arranged on a sliding body in the drawing die opposite the cutting edge of a cylindrical recess in the drawing cushion.

Description

The present invention relates to a flange-free drawing drawing including a punch with a sliding body and a blank holder cooperating with a press punch.

According to known manufacturing methods, flangeless extracts were achieved by first pulling a deep extract from the blank in the first operation, in which the flange was trimmed in another separate operation, and the remainder of the flange was removed by elongation either in the same or in the next stretcher operation.

Another possibility to ensure a straight edge of the extract is to pierce the flange in the vertical wall of the extract.

To carry out the operations outlined above, at least two separate devices are required. tools, since these are always at least two separate operations.

The above-mentioned drawbacks of the prior art in the field of the production of flush-free flanges with a flush-flanged edge eliminate the device according to the invention, characterized in that the edge of the pulling edge of the punch is formed by a circular blade on the sliding body in the punch. in the retainer.

In particular, the effects of the invention have the effect of eliminating the consequences of the ductility of the resulting flange prior to the drawing of the punch. For example, a single sheet metal blank will produce a flange-free and flush-fed extract, which in total means a reduction in manufacturing costs and the cost of introducing such extracts.

Other effects and advantages of the invention will be apparent from the following description of an exemplary embodiment of a suitable apparatus and from the drawing in which FIG.

longitudinal section of a die with a sliding body with a circular blade against the shear edge of the recess in the retainer in the post-insertion phase, FIG.

Fig. 3 shows the phase of cutting the flange of the extract, Fig. 4 the final phase of the drawing of the extract of the die through the previous cutting of the flange.

The device for pulling the flanges without a flange consists of a punch 1 penetrating the center of the retainer 2 with a corresponding pulling clearance into the punch plate 3. The edge of the punching edge 4 of the punch plate 3 is formed eg by a circular blade 5 provided on the sliding body 6 in the punch. The depth of the counterbore 8 in the retainer 2 corresponds to or is greater than the stroke length of the sliding body 6 in the punch 3, which is connected, for example, to the lifting rods not shown from the lower retainer of a triple-action press.

The function of the described device is as follows: Pří224368. the shear 9 is placed on the upper edge of the punch 3 and the retainer 2 and the face of the punch 1 are attributed. By further movement of the punch 1 (FIG. 2), the blank 9 is drawn into the cavity of the punch body 6 through the pulling edge 4. · The shape of the forepart 10.

When the selected draw depth is reached, the travel of the punch 1 is interrupted and the sliding body 6 in the punch 3 is moved by means of the lifting rods (not shown) (FIG. 3). By moving the sliding body 6, its annular edge 5 acts on the flange of the blank 10 against the shear edge 7 in the retainer 2 until the flange is trimmed from the blank 10.

In the next stage of drawing, the sliding body 6 is left in i

224368 in the raised position or lowered to its initial position (Fig. 4) and by continuing to move the punch 1, the protrusion 10 is drawn into the cavity of the sliding body 6 until it becomes a definitive extract. 11 without the flange and with the edge aligned, since the tapered edges of the flange on. the blank 10 has been trimmed.

After opening the device, wiping off the extract 11 and removing the waste 12 and the flange of the blank 10, the cycle is repeated.

The device according to the invention is advantageous for use in particular on multi-action hydraulic drawing presses, in the production of dishes, gas cylinders, pressure vessels and the like.

Claims (2)

SUBJECT OF THE INVENTION An apparatus for drawing extracts without a flange, comprising a punch with a sliding body and a blank holder, cooperating with a press punch, marked. in that a circular blade (5) is formed on the sliding body (6), forming the edge of the leading edge (4) of the punch (3), wherein the circular blade (5) is arranged against the cutting edge (7) on the recess (8), formed in the retainer (2). Device according to claim 1, characterized in that the depth of the recess (8) is equal to or greater than the stroke length of the sliding body (6) in the punch (3).