SU1523239A1 - Die for trimming flash in hot-stamping forgings - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in forging and stamping production in the manufacture of workpieces of parts by hot forging forgings with scrap. The purpose of the invention is to improve the operating conditions by facilitating the removal of the trimmed scrap and making it possible to mechanize this process by splitting the strip into pieces, taking into account that the dimensions of the scrap around the perimeter of the forging and the thickness are different. Obreza matrix of the stamp consists of two semi-matrices with a cutting edge both along the inner perimeter and along the line of their connector. Opposite this line, knives are fixed on the punch, which divide the cut burr into parts, entering the gap formed by the semi-matrices when exposed to them by the semi-matrix sliding drive wedges. These wedges are made with a certain angle of inclination, which ensures the expansion of the semi-matrix by an amount equal to the distance between the cutting edges of the knives. In order to increase the reliability of the removal of the divided parts of the oblo from the working area of the punch, the punch is equipped with pivotally mounted dumpers, which push the parts of the oblo along the scrims made on the external sides of the cut matrix. 1 hp f-ly, 4 ill.

Description

The invention relates to the processing of metals by pressure and can be used in forging and stamping production in the manufacture of workpieces of parts by hot forging of forgings with scrap.

The purpose of the invention is to improve the operating conditions by facilitating the removal of the trimmed scrap by dividing it into pieces, taking into account the fact that the dimensions of the scrap around the perimeter of the forging and the thickness are not the same.

FIG. 1 shows a stamp in the initial position (left) and at the time of trimming the bur (right), section; in fig. 2 — stamp at the time of dividing the oblo (left) and at the time of removing (dropping) the divided oblo (right), section; in fig. 3 - lower half of the stamp in the position of the connector of semi-matrix cut matrix; in fig. 4 - cut punch, bottom view. The stamp contains (Fig. 1.3) the top plate 1, in which the punch 2 and the wedge 3 are fixed. On the bottom plate 4, a die 5 is mounted, into which the forging 6 is laid. The die 5 consists of two parts - semi-matrixes that have move apart i.e. move along the plane of the bottom plate 4 under the action of the wedges 3. Both the semi-matrix are made in the form of a slip and have additional cutting edges ab along the connector line of the cut-matrix (Fig. 3). The punch 2 is provided with knives 7 fixed on its side surface and pivotally mounted dumpers 8, which can be rotated relative to the axes 9. Axis 9 (Fig. 4)

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O5 CD

They are placed on the protrusions of the core 2 of the punch 2 parallel to a straight ef connecting the intersection points of the cutting edges of the knives and forming the core. The knives 7 are installed in the punch 2 so that their cutting edges are located opposite the additional cutting edges of the cutting matrix 5.

The stamp works as follows.

Processed gishchtampovany forgings 6 are placed in a cut matrix 5 (Fig. 1). When the press slider moves with the top plate 1 down, the punch 2 pushes the forging 6 with its bottom end through the matrix 5, cuttings around the contour of the forging. After the trimming (Fig. 2) is finished, the wedge 3, by acting on the moving parts (semi-matrix) of the trimming matrix 5, moves them apart by an amount equal to the distance between the cutting edges of the knives. Moreover, the additional cutting edges ab of the die 5 are installed opposite the knives 7 located on the punch 2.

The knives 7, moving downwards relative to the additional cutting edges ab, cut the burr, dividing it into two equal parts, symmetrical with respect to. “NII ef. At the moment when the separation has come about, the punch 2 by the inclined surface of the protrusion cd moves both sides to the different directions from the ef line, thereby preventing the bend of the obdus 7. By further movement of the punch 2 downwards (FIG. 2), they are hinged 8, with their lower sharp edges, come into contact with parts of the rim and, turning about the axes 9, further (in different directions from the ef line) move the parts of the rim, moving them to the edges of the trimming matrix. 5. Under their own weight, the separated parts are scraped off by these sklys from the treatment area.

When the upper plate 1 moves with the punch 2 and the wedges 3 upward, the latter, acting on the moving semi-matrices, move them (shift) to the initial position. The movement occurs when the lower end of the punch 2 is located higher than the die 5. The resetters 8 return to their original position, turning around

axis 9 under its own weight.

In the case where the forging in the chip is not

laid, when moving the slide press with

top plate 1 down (since the contact

there are no blowers with a break; rotation of the throwers 8 relative to the axes 9 occurs due to the sliding of the sharp edges of the throwers 8 along the inclined grooves B. The notches are made on the slits of the trimming matrix 5, are located opposite the throwers 8 and are intended to avoid

the contact of the dumpers with the working surface of the die 5. When the press ram moves upwards, the work (stem) is similar.

Claims (2)

Invention Formula I. A stamp for trimming the strip of the mountains of stamped forgings, containing the upper plate and the punch attached to it, the lower plate and the cutting matrix installed on it with a cutting edge along the inner perimeter, consisting of two separate semi-matrix, as well as a wedge drive, their sliding apart wedges mounted on the top plate on both sides of the punch, characterized in that, in order to improve the operating conditions by facilitating the removal of the trimmed billet by dividing it into parts, it is provided with side mounted The dimensions of the punch with diametrically placed knives placed opposite the die's line of the die, the semi-matrixes are set with the possibility of extending by an amount equal to the distance between the cutting edges of the knives, and along the socket line of the die, additional cutting edges are made. 2. A stamp in accordance with Claim 1, characterized in that the punch is provided with hinged ejectors of a divided burst. Fie.2 fie.Z