SU1532138A1 - Die for piercing parts from sheet material - Google Patents

Abstract

The invention relates to cold forming and can be used to make dies for the perforation of sheet material. The purpose of the invention is to increase die resistance and perforation quality by dispersing punching efforts. Punches are made in the form of solid plates (P) 2, 3, having an angular slope. P 2 have one direction of incline, and P 3 - the opposite direction of incline. Cuts 2 and 3 are cut, forming the cutting edges of the punches, made at angles β ₁ and β ₂ , due to the direction of the cuts perpendicular to the working surface P 2 and 3 and the die. The alternation of plates with opposite slopes ensures the stability of the position of the workpiece and the tool during the punching process. Performing the cutting edges at different angles reduces the punching force. 4 il.

Description

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The invention relates to cold forming and can be used in the manufacture of dies for punching articles from sheet material.

The purpose of the invention is to increase the resistance of uiTaNina while improving the quality of perforation by dispersing punching efforts.

FIG. 1 shows the upper (punch) part of the stamp; in fig. 2 - the lower (matrix) part of the shtag / .p; in fig. 3 is a view A of FIG. 1: on fig 4 - section B - B in FIG. one.

The stamp contains upper plate 1 with through longitudinal grooves in which plates 2 and 3 are installed with help of PT fats 4. Plates 2 and 3 are made with angular inclinations and groups of punches 5 and 6 are formed on them. for example, five punches on each plate. Plates 2 and 3 are mounted in the H-longitudinal grooves of the upper plate 1 so that the plates 2 with the same inclination direction alternate with the plates 3 having the opposite inclination direction. For example, the group of punches o has a right slope, and the group of punches 6 has a left slope relative to the surface of the die 7.

Angle a is chosen so that the leg of the right-angled triangle OKN, opposite to angle a, is greater than S of the perforated workpiece, but less than the working stroke of the punches 5 and 6 in the direction of the action of usi; 1 and punching P. This is necessary to ensure the reliability of the decoupling operation when punching pr.mougo.1nyh holes.

The transverse cutting edges on the groups of punches 5 and b are formed by making cut-outs 8 on the inclined working surface of plates 2 and 3. At the same time, the cutting edge of each punch, most distant from the surface of the top plate, is formed by perpendicular cutting of the cut relative to The working surface of the matrix 7, and the cutting edge of the punch, is located at a closer distance from the surface of the upper 11lit1) D is formed by first} 1dikulno1 h direction of the cutout to the working surface of the plates 2 and 3, resulting in Obtain sharp corners and cutting Rzsootvestvenno. Angle p for punches 5 and 6 P1) is lucent when making notches 8 perpendicular to the working surface of die 7, and Wilt Pi for cores 5 and 6 is obtained when making notches 8 perpendicular to working nj. Surface of plates 2 and 3

Due to the oblique ;-) location of the working surface of plates 2 and 3, the edge is angled at pi, located on punches 5 and 6 at a greater distance oi of the top plate 1 or closer to the surface

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matrix /, previously enters into operation, and the cutting edge under yr; ioM p2, p; placed on punches 5 and 6 at a smaller distance from the top plate 1 or further from the surface of matrix 7, later enters pa6oTyj Matrix 7 consists of separate liners: extreme 9 and 10 and middle 11, containing through grooves 12 and docked with each other so that between the liners are formed thanks to the grooves 12 working cavity corresponding to the punches. The matrix inserts 9, 10 and 11 are mounted and fixed on the bottom plate 13 by means of pins 14 and 15, with which at least the extreme matrix inserts 9 and 10 are provided.

The stamp works as follows.

In the initial position of the stamp, the sheet stock 16 is fixed and fixed in the bed of the matrix block. The punching of rectangular holes is carried out as a result of rectilinear motion and the top plate. 1 with a block of poisoiovs 5 and 6. At this, the plunging of punches due to their inclined position occurs gradually from both the left and right sides. for the fact that the group piercing plates 2 and 3 are arranged with alternating oppositely directed laying to the working surface of the matrix block,

B. tagadar on punches 5 and 6 of sharp cutting angles pi and Pr and gradual cutting of the cutting part of punches 5 and 6 due to the presence of a slope on their working surface are facilitated by cutting, which is caused by a decrease in friction forces during metal separation and an increase in die resistance. tooling. The indicated factors of sharpening the cutting part of the punches, as well as their inclined arrangement, ensure a reduction in the occurrence of burrs on the workpiece. Alternately positioning the oppositely directed punches, eliminates noBbinjeHHbix bending deformations of the workpiece during punching. Due to the group execution of punches on the whole plate, as well as the block version of the die, the labor costs and increased HjaeTfH manufacturability of H3roTOBjieHHH and operation of the proposed stamp are reduced.

The technical advantages of the proposed i (j (but ptamp compared to the protype) are as follows:

the possibility of punching rectangular holes with less effort - .- | And, since the punches do not work simultaneously with all cutting edges, but without a wall, which has a positive effect on tool life and improved quality of perforation;

- the possibility of punching holes with less friction forces is provided, so

as the cutting angles on the cutting part of the punches are sharp and this provides for improved durability of the punches;

- high quality of perforation of products is ensured, since when punching holes due to reduced friction efforts, the formation of burrs is reduced, and due to dispersal of punching efforts due to the installation of punches with alternate arrangement of plates with opposite direction to the matrix surface, the deflection of the blanks is reduced;

The stamp is simple and easy to manufacture and operate, since the cutting parts of the punches are made on a single plate to form a group of punches, and the plates themselves are fixed with the help of pins in the grooves of the upper plate, which ensures a smaller number of fitting joints and simplifies the geometric interposition ;

The simplification and increase in the manufacturability of the punch is also ensured by the implementation of a matrix consisting of individual liners that are joined together.

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Claims (1)

Invention Formula A punch for perforating sheet products, comprising an upper plate with a set of group punches with cutting edges and a lower plate with a matrix fixed on it, characterized in that, in order to increase the durability of the stamp by dispersing punching efforts and improving the quality of perforation, the punches are made in the form of plates installed in the grooves of the upper plate provided for them and having an angular slope on the side of the working end and arranged so that the plates with the same inclination direction alternate TC with plates having the opposite direction of the slope, the cutting edges of the groups of punches are formed by cuts made on the working end of the plates, while the cut-out forming the cutting edge of each punch most distant from the surface of the upper plate is directed perpendicular to the working surface of the die, and the least distant - perpendicular to the working surface of the plate. 2 Type A FIG. five eleven pn W // L 1i /BUT 14 of FIG. H Bb eleven /// 77 /, /BUT s