SU1077740A1 - Method of spark-erosion producing of punch of blanking die - Google Patents

Abstract

METHOD OF ELECTRIC PROPERTIES MANUFACTURING OF PUNCHER CUT. The STAMP, by which the first 3 | electrode-tool is made by the electroerosion method, forms a punch profile for them, and then a cutting edge is formed on the punch profile with a second electroscope tool, the second electrode being used to increase the accuracy of manufacturing the punch profile the tool is formed by means of 1 first electrode tool, and when forming the punch profile, the first electrode tool is rotated 180. -vl 4

Description

The invention relates to the electrical discharge machining of metals, in particular, to the manufacture of precision dies, and can be used in the manufacture of printed circuit boards by the stamping method.

The known method of electroerosive fabrication of a punch of a punch die, according to which, at first, the required contour is cut out with a wire electrode-tool, and then the working profile of the punch fl is formed by the element formed during cutting.

There is also known a method in which in order to use the obtained punch to cut down the conductive elements of printed circuit boards with sufficient accuracy and performance, a cutting edge is formed on the punch along the entire contour with the help of an additional element of the tool, which is obtained by cutting this contour. poins-on 2,

However, the known method of forming the cutting edge of the punch does not allow achieving high precision of its manufacture due to the impossibility of varying the size of the additional electrode, which entails a decrease in the accuracy and quality of the cutting of the conductive element of the printed circuit board.

The aim of the invention is to improve the accuracy of manufacture of the punch profile.

The delivered chain is achieved in that, according to the method by which the first electrode-tool is formed with wire cutting, it forms a punch profile, on which the cutting edge is formed with an additional electrode, the second electrode-tool is made with an electric tool, then the back side of the first electrode is electrified. form the profile of the punch, on which I with the second electric tool form the cutting edge.

FIG. 1 shows the scheme for manufacturing the first electrode tool; in fig. 2 shows a scheme for manufacturing a second electrode tool; in fig. 3 is a schematic of the manufacture of the punch profile in FIG. 4 shows the manufacture of the cutting edge of the punch | in fig. 5 is a cross section of the punch after machining the cutting edge

The method is carried out as follows.

First, using the EDM method, cut the required contour in the billet, thus obtaining the first

electrode tool 1 (Fig. 1). The cutting is carried out by npoi of the voltaic electrode 2. Then the second electrode-tool 3 is made (Fig. 2J. Next, turning 5 electrode 1 by leo, the profile of the punch 4 is formed (Fig. 3, on which the second electrode of the punch 3 is formed cutting edge 5 (Fig. 4). The transverse dimensions of the element 10 of the punch 4 are larger than the dimensions of the electrode tool 3 by the width of the cutting edge 5. This is achieved by successive processing (turning) the edges of the profile of the second electrode electrode 3 with the first electrode tool at their mutual coordinate offset by the value of a given width of the cutting edge 5 of the punch shown in Fig. 5, or by appropriate selection of processing modes for the electrode tools 1 and 2. The second electrode-tool 3 is processed with a more rigid mode and a higher no-load voltage .

The arrows in the drawings show the direction of supply of the electrode electrodes during processing, and the signs + and - indicate the polarity of the connection to the power source of the EDM machine.

Example. The punch is made of hardened steel of the type HVG with electrodes-tools made of copper

5 Ml GOST 859-66. The manufacture of the electrode 1 {FIG. 1} is conducted on a 4531P type CNC cutting machine. The diameter of the wire electrode 2 tungsten 0.15 mm. As

0 The working fluid is distilled water. The cutting is carried out with the following treatment mode: no-load voltage, Ux. AT; operating voltage

5 foS 70 V; short emaccani current, JK: J. 0.9 A; capacitance C 0.5 μF. The subsequent technological operation is the manufacture of the second electrode-tool

 The diagram shown in FIG. 3, on

4G721M type copying machine in rexime: working frequency of pulses, f 200 kHz; operating current / Af average no-load voltage, Ux.x 50 V; the average

5 operating voltage, V; duty cycle, Q 2.5. Then on. In the same mode, this electrode tool along the perimeter is sequentially processed while the electrodes are moving in the horizontal plane by an amount equal to the width of the cutting edge 5.

. Another method of fabricating a solid electrode tool involves enclosing 5 seconds in the selection of the appropriate machOBIt modes so that its linear dimensions are smaller. dimensions of the punch elements on the value of a given cutting edge width. The following processing modes are used: operating frequency of pulses, i 66 kHz; operating current 3pef 3 A; average no-load voltage, Ux.x 150 V; average operating voltage and ditch: 30 V; duty cycle, C 1.4. The same machine is used to form the punch profile with the help of electrode tool 1, rotated around an axis by 180, according to the scheme shown in FIG. 3, under the mode; operating frequency of pulses, 1,200 kHz operating current, EryU 5 A; average operating voltage, Upaf 15 V average idling voltage, Ux 50. Working duty cycle, Q 2.5 The final process of the operation ends with the manufacture of the cutting edge 5 around the entire contour of the element of the punch 4 with the help of the electrode-tool 3 Fig . four). As a working environment uses kerosene. The contour of the punch and its cutting edge are made with an accuracy of ± 0.005 mm. The resulting width of the cutting edge is placed in the interval of 30–50 µm, depending on the turning value or in the corresponding processing mode of the contour of the second electrode tool 3. The punch can be made of any conductive material with a sufficiently large density of elements on its working surface. . At the same time, the accuracy of forming the cutting edge along the entire contour on all the elements of the punch is the same. Separate stages of the technological process are carried out in an automatic and semi-automatic processing mode. The use of the proposed method provides, in comparison with the prototype, a reduction in the labor intensity of stamp manufacturing; expanding the technological capabilities of EDM manufacturing precision stamps for stamping punched elements of printed circuit boards. Compared with the known method, the cost of producing one printed circuit board by the method of stamping is reduced by 10-15 times, depending on the complexity of the printed circuit board. The expected annual economic effect from the introduction of the proposed method is more than 400 thousand rubles. In addition, the manufacturing accuracy of the conductive elements of the printed circuit board is increased 10 times.

FIG. 2

phage. J

Claims (1)

METHOD FOR ELECTROEROSION MANUFACTURE OF PUNCH PUNCH OF THE PUNCHING STAMP, by which the first Electrode-tool is made by the electroerosion method, they form a punch profile, and then a second electrode-tool forms a cutting edge on the punch profile, characterized in that, in order to increase the accuracy of manufacturing the profile the punch, the second electrode-tool is formed by means of the first electrode-tool, and when forming the profile of the punch, the first electrode-tool is rotated 180 °. SS ω s