RU20269U1 - STAMP FOR PUNCHING SHAPED HOLES - Google Patents

Description

MKI-B21028 / 14 Stamp for punching shaped holes

The utility model relates to the field of engineering. Namely, to the processing of sheet material by pressure, in particular, to cutting-punching of sheet material. Known sheet tweezers dies containing a matrix, a guide plate and a punch punch, as well as sheet dies with guide columns containing a matrix, a punch punch and a guide column 1. Closest to the proposed is a punch stamp containing a matrix provided with a sharp edge, a base, a guide plate and punch punch with a cutting edge 2. The disadvantage of this device is limited technological capabilities, namely: the stamp does not allow punching shaped holes in anywhere in a long sheet or part obtained from sheet material. The objective of this utility model is to expand the technological capabilities of the stamp by introducing additionally the possibility of punching shaped holes in any place of a long sheet or part obtained from sheet material. 1 / . LOO - - Uf The solution to the technical problem is achieved by the fact that in a stamp containing a hollow matrix equipped with a sharp edge around the perimeter of the shaped hole corresponding to the punched, a punched punch made around the perimeter of the shaped part with a cutting edge, an insert provided with a through groove and located inside the cavity matrix, the liner is located in the cavity of the matrix without the possibility of rotation in it, the punch is equipped with a guide shank, while the shank is placed in the through groove of the liner without the possibility of rotation in it, and in Lee-preform, which is a lengthy sheet or part is obtained from a sheet material, a hole whose diameter D is not less than d, wherein d- circumscribed circle diameter corresponding to the shank of the punch guide in a section perpendicular to its axis. The proposed device is illustrated by the drawings shown in figures 1-3. Figure 1 presents the stamp, General view; figure 2 is a section of the guide shank of the punch perpendicular to its axis; Fig. 3 is a view of a long sheet or sheet metal part before punching a shaped hole. The stamp consists of a hollow matrix 1, a punch 2g made with a guide shank 3 and a liner 4, equipped with a through groove and placed in the cavity of the matrix. . . .

- 3

Along the perimeter of the shaped hole, the matrix 1 is provided with a sharp edge. A cutting edge 6 is made along the perimeter of the shaped part of the punch 2. In the workpiece 5, which is a long sheet or part made of sheet material, a hole is made with a diameter D of at least d, where d is the diameter of the circumference described corresponding to the guide shank punch in a section perpendicular to its axis. The guide shank 3 of the punch is made with the possibility of placing the insert 4 in the groove without turning, because the cross section of the shank 3 and the insert groove 4 are congruent figures of arbitrary shape, for example, squares.

The stamp works as follows.

The workpiece 5 is placed on the working end of the matrix 1 mounted on a support, visually checking the coincidence of the through groove in the insert 4 and the hole D in the workpiece. The guide shank 3 of the punch 2 through the hole D in the workpiece is placed in the groove of the insert 4 and the cutting edge 6 is in contact with the surface of the workpiece. Next, punching force F is applied to the front surface of the punch. After the working stroke, the liner and the envelope from the stamp are removed manually, removing the support from under the matrix.

The use of this design punch stamp avoids the use of expensive equipment in small-scale production.

Used sources

1 - V.P. Romanovskiy Handbook on cold stamping, Mechanical Engineering, Leningrad, 1979.C.448-449 2 - V.P. Ostrovskiy Handbook on cold stamping, Mashgiz, M. 1967.P.233, Fig. 82- prototype

J i .-- .. „,,,

 / / (

Claims (1)

A stamp for punching shaped holes in blanks such as long sheets or curved parts obtained from sheet material with a pre-made hole, containing a hollow matrix provided with a sharp edge around the perimeter of the shaped hole corresponding to the punched, punched punch made around the perimeter of the shaped part with a cutting edge, the insert provided with a through groove and located inside the matrix cavity, characterized in that the insert is located in the matrix cavity without the possibility of rotation in it, punch provided with a guide shank while. the shank is adapted to be placed in the through groove of the liner without turning in it, and the diameter of the previously made hole D is not less than d, where d is the diameter of the circumscribed circle corresponding to the guiding shank of the punch in a section perpendicular to its axis.