Speed trim punch

 

(57) Abstract:

Usage: in the processing of metals by pressure when stamping the cleaning of the workpieces. The working face of the punch is made in the form of 16 sectors, the cutting edges are located on a circle in the vertical direction in the sequence according to which the cutting edges of the first five sections are directed upwards, the following four areas - down, the cutting edges of the next four sections - up, and the last three sections - down, with the cutting edges of the one-dimensional plots in each of the aforementioned groups are at the same level relative to the base of the working face of the punch and the cutting edges of the one-dimensional plots unidirectional groups are diametrically opposite. 4 Il.

The invention relates to the processing of metals by pressure, namely stamping works on schilke blanks. There are many stamps that have circumferential cutting portion of the punch is on their end (e.g., auth. St. N553027, 958030, 1437143, 1003989 and others).

Also known stamp on author. St. N 378273, class B 21 and 37/08 for combined cutting and firmware stamped parts. The stamp contains the upper tile, piercing punch and the lower I is working with the location of the cutting edge along the edge. Trim Burr or want to remove part of the fill the blank occurs simultaneously around the perimeter.

This requires certain processes with the right effort, which is often not the case in production, as well as taking into account the specific resistance of the fin (its configuration and thickness when cutting (punching) there is a broken-out section of the body blanks.

Known also gradually edged punch having a beveled cutting edges located on the perimeter of the working end of the punch (Malov, A. N. The technology of cold pressing. Barongis, 1949, S. 53, Fig. 56 (a, g).

These punches can't be used for punching holes in the casting, as they are deprived of the alignment, at the same time calling into the hole of the cutting edges, which will lead to the unfolding of the casting due to unilateral push (force).

The challenge is to expand the technological capabilities and forging equipment and to prevent the marriage preparations.

The problem is solved by a punch, which the working face is divided into 16 sectors with cutting edges, which are arranged in a stepwise manner circumferentially and vertically in the following sequence: 5 cutting edges rise up, sldram high level to the base of the working end and diametrically opposite to each other, that provides centering the workpiece on the plug on the entire height.

At each step the corners of the cutting edges vertically and horizontally sharp, which further reduces the required cutting forces.

In Fig. 1 shows a General view of the punch of Fig. 2 is a top view of Fig. 3 - section b-B in Fig. 2; Fig. 4 - scan along the perimeter of A. In the punch 1 has a hole 2 to simplify the manufacture of punch. End the working part 3 of the plug 1 is made stepwise, and each of the steps has 4 cutting edges (horizontal and vertical) with two sides, forming cutting edges 5 and 6. All plots at the working end around the circumference of 16.

The angles for the cutting edges are set depending on the need to preserve resistant cutting edge and workpiece of the metal billet.

Practical conclusions for ferrous metals angle is taken within 5 - 8.

Areas with cutting edges are numbered from one to five, periodically save the sequence in the vertical direction: 5 of them rise up, 4 down, then the following 4 - up and 3 - down.

The punch operates as follows: when driving down ratanapura punch goes up. The workpiece is removed.

The application of the proposed construction of the plug allows the cutting operation (cutting) on less powerful hardware and prevent tear-out of body blanks.

At the Ural automobile plant produced the punch in/design and is in pilot operation to trim the stamp for castings adjusting nut (item 375-2403040).

Stepped cutting punch having a cutting edge at the working end face, characterized in that the end face of the punch is made in the form of 16 sectors, the cutting edges are located on a circle in the vertical direction in the sequence according to which the cutting edges of the first five sections are directed upwards, the following 4 sites down, the cutting edges of the next four sections - up, and the last three sections - down, with the cutting edges of the one-dimensional plots in each of the aforementioned groups are at the same level relative to the base of the working face of the punch, and the cutting edges of the one-dimensional plots unidirectional groups are located diametrically of the parties.

 

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FIELD: plastic working of metals, possibly in machine engineering for precise blanking of parts.

SUBSTANCE: die set includes punch mounted on slide of press; cylinder filled with elastic medium and having supporting plunger mounted on table of press; lower die mounted with possibility of axial motion on inner cylindrical surface of cylinder. Lower die embraces counter-punch and rests together with it upon elastic medium. Diameter of supporting plunger is less than diameter of inner cylindrical surface of cylinder. Die set also is provided with upper die rigidly joined with housing of cylinder; and plunger-sleeve with shoulder. The last is mounted in cylinder on supporting plunger at axial gap relative to table of press and with possibility of axial motion relative to cylinder limited by means of said shoulder. Diameter of supporting plunger is less and diameter of plunger-sleeve is more than diameter of counter-punch.

EFFECT: enlarged manufacturing possibilities of die set.

2 dwg

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