RU25706U1 - ELECTROCHEMICAL SEWING DEVICE - Google Patents

Description

JAISRRRIA

2 Q

IPC V23U / 04.09

DEVICE OF D.J. ELECTROCHEMICAL

SEWING

The utility model relates to electrophysical and electrochemical processing methods and can be used to obtain holes, through grooves and slots in thin-walled parts.

There is a method and device for electroerosive flashing of various contours in thin-walled parts (see book. "Dimensional electrical processing of metals B.A. Artamonov, A.N. Vinnitsky, Yu.S. Volkov, A.V. Glazkov - M., Vyssh School, 1978 - p. 145-151).

The disadvantage of this method is the wear of the electrode-tool, and therefore, low machining accuracy, low roughness of the processed surface, the difficulty of manufacturing the tool-electrode, the need to use expensive and complex equipment.

A device is known for electrochemical forgiving of various thin-walled parts (see A.S. K 1.465.208 according to IPC V23N 3/04, 9/06), containing a cathode, on the working surface of which grooves are formed that communicate with electrolyte-feeding channels and a dielectric stencil located between the cathode and the workpiece.

In this device, in order to retain stencil elements having a closed contour that forms a cut out pattern, as well as to iridate them with stiffness, through cuts in the stencil are performed with technological jumpers. Therefore, the electrochemical flashing of a given pattern from sheet blanks is carried out in two stages: in the first operation, a cut out pattern is formed with technological jumpers, which are usually located along its contour, and in the second operation, technological ceramics are removed, i.e. finally impersonate the given. Thus, a significant disadvantage of the known device is low productivity, since a given cut-out floor starts at least in two operations.

The objective of the utility model is to increase the productivity and accuracy of electrochemical flashing of thin-walled parts.

This goal is achieved by the fact that in the device for electrochemical flashing, containing the cathode and dielectric stencil, through cuts on the stencil are performed without technological jumpers, and between the cathode and stencil there is a metal foil fixed on the stencil, on which also through cuts are made, while through cuts, the image of a skinny edged contour of the processed pattern, is absent on the metal foil.

When processing the proposed device, the accuracy of electrochemical flashing will depend only on the accuracy of the specified 2M 40l-i}

stencil and metal foil, while the processing in two operations is carried out by means of ds, devices, or at least by rearranging two different stencils on one device, i.e. the accuracy of processing will depend on a large number of factors: the accuracy of the stencils, the error in basing the stencils, the error in the basing of the part relative to the stencils.

Figure 1 shows a stencil with a metal foil fixed on it and through-cuts made in them; figure 2 is a section aa. in FIG. i; on figs - section b - b in fig. 1; in Fig.4 is a partial view 1 in Fig. 1; Fig. 3 shows a diagram of the electrochemical flashing of a resistive element of a flat foil heater of an electric waffle iron; Fig.6 is a section D - D in Fig.Z.

The device for electrochemical flashing contains cathodes 1 and 2, which are mounted motionlessly in the upper 3 and lower 4 parts of the detachable housing, the workpiece 5, installed between two stencils 6 and 7, through-cuts 10 made in the stencil and metal foil, cuts 11 made in stencil and shaping: a cut-off contour of a stitched pattern, in particular, of a resistive element of a flat foil heater, electrolyte-feeding channels 12 communicating with grooves 13 on the working surfaces of cathodes 1 and 2, nipples 14.

Processing by the proposed device, a trace of Yu1Dim is made. The workpiece 5 is placed between the stencils 6 and 7. For this purpose, the device is made detachable, consisting of upper 3 and lower 4 parts. On the sides of the stencils 6 and 7, facing the cathodes 1 and 2, a metal foil 8 and 9 is fixed, i.e. the working surface of the cathodes interacts with a metal foil. The cathodes 1 and 2, mounted in the upper and lower parts of the apparatus rhorn, are connected to the negative pole of the technological voltage source, and the processed part is connected to the positive pole. Therefore, the metal foil 8 and 9 will also be connected to the negative pole of the process voltage source during processing. Then, the upper 3 and lower 4 parts of the device casing are pressed against each other, thereby ensuring tight contact between the workpiece 5 and the stencils 6 and 7. Through the fittings 14. the electrolyte feed channels 12 and the grooves 13 on the cathode working surface pump the electrolyte through the treatment zone. Then include a source of process voltage. During processing, anodic dissolution of the workpiece metal occurs both in the zone of through-cuts 10 made in stencils and metal foil, and in the zone of blind cuts 11 made in stencils only. This design provides a rigid connection of the stencil elements, i.e. no need to make technological jumpers, and therefore, the proposed device

allows 1chestrove electrochemical flashing (tenderloin) of a given contour in one operation, which increases the productivity of processing. In addition, the metal foil 8 and 9 also works as cathodes. In this case, the width of the cuts on it is equal to the width of the cuts on the stencil, which reduces the interelectrode gap, since for a small width of the cuts 10 to create a stable hydrodynamic flow regime of the electrolyte B in the treatment zone, the grooves 13 on the cathode working surface are wider than the cuts 10, i.e. in the absence of metal foil, the interelectrode gap determined by the distance between the cathode and the workpiece will be greater than the interelectrode gap in the processing of the proposed device. As is known, a decrease in the interelectrode gap allows one to increase the processing productivity.

The accuracy of the electrochemical flashing of the proposed device, which depends only on the error in making cuts on the stencil and metal foil, is higher than the accuracy of processing with known devices, which depends on a large number of errors: the error in the manufacture of stencils, the error in their basing, the error in basing the part relative to the stencils, because processing by known devices is carried out in two operations.

The track widths of the resistive element were also measured using an instrumental microscope. Processing accuracy for l iiouo

the carved contour of the resistive element during electrochemical flashing on known devices for two operations is higher by an average of 0.02 0.03 mm relative to the processing error of the remaining contour of the resistive element.

Thus, the proposed design can improve both productivity and accuracy of processing of electrochemical flashing.

Claims (1)

A device for electrochemical flashing, containing a cathode, on the working surface of which grooves are formed, communicating with electrolyte-feeding channels, and a dielectric stencil with through cuts corresponding to the processed pattern, characterized in that the through cuts on the stencil are made without technological jumpers, and are placed between the cathode and the stencil metal foil mounted on a stencil on which through-cuts are made, while through-cuts forming a cut edge round of the processed drawing, on metal foil are absent.