SU897339A1 - Compound die for forming, punching, beading and trimming sheet work - Google Patents

Description

(54) STAMP OF COMBINED ACTION FOR FORMING,

PUSHING, DRAWING AND CUTTING

SHEET PREPARATION

one

The invention relates to pulsed methods of metal forming and can be used in the stamping workshops of the engineering, aviation and instrument-making industries.

A well-known stamp is a combined action, containing an elastic punch and a matrix L for forming, punching, and a scraper having a cutting edge on the working surface facing the workpiece 1 mounted thereon.

The combined action stamp is also known, which contains an elastic punch and a matrix for molding, punching, cutting, having a cutting edge on the working surface facing the workpiece, made of a forming-cutting part and covering its spring-loaded chipping part on the section of the working surface. which, in contact with the forming-cutting part, is made a notch with an annular platform adjacent to the forming-cutting part, the width equal to the thickness of the part, cutting the edge of the chipping part the matrix is formed sequentially placed in the direction from the center of the notch and made in it a conical groove 2.

A disadvantage of the known device is the impossibility of obtaining parts with

5 exact dimensions in height and high-quality butt. When using the known device, a ragged end of the part is obtained, the instability of the part size in height due to the anisotropy of the properties of the metal, which appears during the flanging process,

10 as well as due to the instability of the electric discharge in the fluid and, as a consequence, the introduction of a turning operation — cutting the end of the part — is required.

The aim of the invention is to improve the accuracy of manufacturing parts and their quality.

va.

This goal is achieved by combining the punch for forming, punching, flanging and cutting the sheet stock, containing an elastic sleep and an array installed under it on the bottom plate, an integral part of the die-cutting part and the spring-loaded chipping part surrounding it with a cutting edge on work surface.

formed by a central annular recess and a conical groove made therein, is provided with a base disposed on the bottom plate carrying, limited in it, moving along the axis of the forming-bulge part having on the surface facing the base the cutting edge for cutting the shaped billet along the contour and facing to The forming-cutting part of the surface and the base, made conical, has grooves with cutting edges separating the chopped-off part.

FIG. 1 shows schematically the chip in the working position; in fig. 2 — Shtamp after the end of the shtampovka process; in fig. 3 is another embodiment of the combined action in the working position.

The combined action punch consists of an elastic punch, for example, a discharge chamber I, a bottom plate 2 with a matrix installed on it, assembled from a mold-cut part 3 with a cutting edge 4 located at a height h equal to the height of the part and adapted for axial movement. along the inner guide surface of the base 5, having the diameter of the upper part smaller than the diameter of the cutting edge of the forming-cutting part by an amount more than the thickness of the workpiece and provided with cutting elements, for example a groove and a cutting edge b, and Schirin depth more than the thickness of the workpiece formed on the conical surface 7 of the base.

The magnitude of the axial movement of the forming-cutting part is limited by the pin 8 installed in it and interacting with the hole made in the base.

The chipping part 9 is axially displaced along the surfaces of the bottom plate mating with the sleeves 10 under the action of the spring 11. On the working surface of the chipping part facing the workpiece 12 there is a notch 13 having an annular platform 14 whose width is equal to the thickness of the workpiece. The cutting edge -15 of the chipping part is formed by a recess 13 and a conical groove 16, successively located from the center of the die. The size in is more than the height of the part h.

The stamp works as follows.

The workpiece 12 is mounted on the working surface of the chipping matrix 9. When the discharge chamber 1 is lowered, the spring 11 is compressed, the chipping matrix 9 moves along the surfaces of the bottom plate 2 that mates with the sleeves 10 and is pressed to it: The workpiece 12 is pressed to the cutting edge 15 of the chipping matrix and to the surface of the molding and cutting part 3.

After the high-voltage discharge in the discharge chamber, a chipping occurs under the action of a pulse load, the waste is bent in an annular conical groove 16. This forms the blank on the forming surface and cuts the waste in the central hole of the die-cutting part 3 of the matrix. Since the size is made larger compared to the height of the part h, then during the flanging, which takes place simultaneously with the forming and cutting, when the metal chopped at the cutting edges 15 slides along the surface of the recess 13, a bend of the metal is formed, which prevents its further free movement under the action of a shock wave 5 generated during the discharge. The metal, moving to a larger diameter of the base cone 5, is braked and a metal chopping occurs at the cutting edge 4. Then the metal waste in the form of a ring is chopped on the cutting edges 6 into pieces. At the end of the shtampovka process, the camera is raised. At the same time, under the action of the springs 11, the chipping part 9 moves upwards and removes the finished part from the forming-cutting part by the annular pad 14. By applying compressed air into the space between the chipping matrix 9 and the bottom plate 2, the forming-cutting part 3 moves upwards, freeing the half-rings of waste, which are then blown out with the supplied air.

Another design of the cutting elements for separating the waste formed after cutting the metal on the cutting edge of the forming-cutting part consists of a base 5 and knives 6 (Fig. 3).

The separation of waste in this case is carried out by knives 6 inserted into slots made in the upper end part of the surface 7 of the base 5, with a depth equal to the height of the truncated cone, and a width 0 equal to the thickness of the knives.

In this way, the accuracy of the part size in height, its stability, obtaining a high-quality end face is achieved, the removal of waste is greatly facilitated, and the number of operations required for its manufacture is reduced, and this is an advantage of the proposed combined action as compared to the known.

Claims (2)

Technical and economic efficiency 0 from the application of the considered tooling is achieved by combining the operations of stamping, forming, cutting and flanging, which eliminates the need to develop and manufacture several machines, frees part of the existing equipment and reduces the costs associated with its operation, as well as obtaining parts with stable dimensions and high quality butt, which eliminates the need for their further processing: the introduction of a turning operation-trimming the butt. All this makes it possible to significantly reduce the metal consumption of the tooling, the laboriousness of its design and manufacture, and therefore, reduce the time and reduce the material costs for the manufacture and production of go-to products. Claims Combined action stamp for forming, punching, flanging and trimming a sheet stock, containing an elastic punch and a matrix mounted under it on the bottom plate, made of a composite of a die-cutting part and a spring-loaded chipping part surrounding it with a cutting edge on the working surface formed by the center an annular recess of the 9th coy and a conical groove made therein, characterized in that, in order to increase the accuracy of manufacturing the parts and their quality, it is provided with The plate has a forming-cutting part that is limited in it and has an axially moving part, having a cutting edge on the surface facing the base for cutting the formed billet along the contour, and on the surface of the base facing the forming-cutting part, which are made conical, have grooves with cutting edges, separating the chopped off waste. Sources of information taken into account during the examination 1. Meshcherin V. T. Listova shtampovka. M., 1975, p. 165, fig. 18-B. 2. USSR author's certificate in application number 2614547 / 25-27, cl. B 21 D 37/08, 11: 05.78 (prototype).