DE1948731A1 - Electrolytic processing device - Google Patents

Description

A 1171

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Anocut Engineering Coiapany "; Elk G-rove Tillage, Illinois,

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Electrolytic processing device

The patent specification .......... (patent application P 18 07 266.7) relates to an electrolytic machining device with means for mounting a hollow forming cathode in a predetermined position with reference on an electrically conductive metallic part to be machined, which can be electrochemically eroded to create a Machining space between the cathode and the part form, with means to the HuS of an electrolyte with high Pressure between the cathode and the rope to be processed and across darch to ensure the gap, with means to a flow of the electrolyte through the cathode listening, the pressure of the electrolyte between the Cathode · and the part to be machined a relative withdrawal movement between the cathode and the rope to be processed to be produced by means of a continuous stream high density and low voltage between the cathode and £ ** i to edit 2®il to steer in such a direction, d & £ -iae g # called # rope is anodic, for rn # r with control means <ä # r ilela "ivbewe ^ ung between the cathode and the to

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1848731

t ends 3? express, umeinen vorherbestiiüiaten gap in the presence of Elektrolytdrxickes to maintain, the latter medium drive means comprise, for generating a relative movement of the cathode and of the cable to be processed along a path which determines the molding of said part. . "

This apparatus is characterized in that it comprises load compensation means which check the tendency of said the Rüekzugrelativbewegung between the cathode and the resist part to be machined, and means connected and .pensatormitteln grain from the viewpoint of Belastuagssteuerung with said directly s for & prints between the cathode and the part to be machined are sensitive in order to quickly free the load compensation means during a sudden decrease in the electrolytic acidity.

The invention now relates to an improvement of the machining device described in this patent specification, which is particularly advantageous where the BoEmungskäthöde has a relatively large working surface - compared to the cross section of the plunger which feeds the cathode . · · ■■ "". ■ ■■ - ■ '■'"""■'"""■' ■■ '^"';;" V-

The new machining device is made up of a load compensation device consisting of a housing that insulates the cathode and the workpiece and forms a closed-loop, arranged behind the cathode, the "-dur'ch-Zuführingsvorriohtic The cathode exerts a pressure which at least partially compensates for the drag that exercises the pulling movement between the cathode and tries to generate it in the workpiece. ■: ■■■ .-. ' . ..- ■ -

The ^ eiohnuhgeii '-' show ih ^; eln®m. Explanatory example of a design of the new device

009838/1342

Xn the drawings Fig. 1 according to the vertical axis of advance of the cathode

Laid section through the end of the rod carrying the cathode and through the one in front of the cathode Workpiece ^

Fig. 2 is a section along line H-II of Fig. 1j

Fig. 3 shows a modification of the embodiment shown in Figs. 1 and 2 f

4 shows a section along line IT-IV in FIGS Fig. 5 is a section on line V-V of Fig. 3.

In the fig. 1 and 2 illustrated embodiment is the The electrode 201 forming the forming cathode is displaced by a feed device which moves the cathode in the direction of the workpiece 203 slides.

This electrode 201 is tob a relatively large one Disc formed, the lower surface of which has hollow parts or internal and Beliefteile or ribs. The workpiece 203 lies on a table 204 and is raised by insulating guide walls 205 which delimit a cooling space in which the workpiece 203 lies with no clearance. The guide wheels are supported against a wall 207, which fixes the position of the workpiece on a horizontal axis while a Pin or several pins 208 (Fig. 2) determine the position of the workpiece on a wide horizontal axis. That In this way, the workpiece to be machined can be placed exactly under the electrode by simply placing it on the wall and the pin 208 is ajar.

The pins 208 are inserted into the socket 210. In the wing. 2, a single base 210 is shown, but other bases can also be used to set the position τοη to be machined workpieces with different dimensions

009838/1342

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948731

secure or clamp the workpiece in another position.

In the embodiment shown, the workpiece is so large and difficult that no special devices are required to hold the workpiece in the given position.

The table 204 has conventional devices 211 for lifting the Workpiece by compressed air and for moving the workpiece on the table.

The electrode 201 constituting the shaping electrode is made of a disk 212 fixed on the holder 213 carried, the is stiffened by a plurality of vertical ribs 215 which extend to the plunger 217, which is integral with the Holder 213 exists. The horizontal surface of the plunger 217 is very close below for the reasons to be described later the horizontal surface of the holder 213.

A bridge 219 is attached to the upper part of the plunger 217 and enables connection to a (not shown) Cathode advancement device.

If the holder 213 is very large, several plungers can be used for Feed of the forming cathode can be used.

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A housing 221 surrounding the plunger 217 is on the wall 207 fastened with bolts to a pressure chamber 225 which cooperates with the rear surface 226 of the holder 213. The housing 221 is stiffened by ribs 222, the increase the resistance of the cylindrical wall. Will the Chamber 225 placed under increased pressure, then the plunger 217 slides in an opening in the housing top wall, so that a displacement of the holder 213 and the electrode 201 with respect to the workpiece 203 takes place.

Clamping screws 227 enable the

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Housing 221 and tappet 217 · As a result, as soon as the fastening screws »wipe the housing 221 and the wall 207 loosened, the plunger and the housing are lifted, to enable access to the workpiece

The electrolyte is drawn into the tree 233 through pipes 231 guided between the electrode 201 and the insulating wall 205 and then flows into the between the electrode 201 and the workpiece 203 located processing room 235ο The one under pressure Electrolyte then flows from the processing space through channels into chamber 237 and enters horizontal channels 239 are on the disk 212 and closed at their ends are.

The electrolyte flows along channels 239 to those in the Disc 212 existing openings 216 and passes through these openings 216 into Hadial channels 241 of the holder 213, which located above channels 239. The electrolyte flows from the channels 241 into vertical channels 243 of the plunger 217 to the Outlet pipes 245 »In the version shown and described Eadial canals 241 are not present above canals 239.

Desired accident, the openings 216 may be of the disc 214 are arranged so DAFL of the channels 236 of the hip of the electrode 201 by electrolyte flowing in other ways in ■ << leuiialkanäle * '241 and vertical channels 243 -is passed as the electrolyte, by the Channels 236 flows, which are arranged in the interior 257 of the electrode.

Such an arrangement has the advantage that the Ausstron is out Channels 243, which are pre-blocked for the electrolyte from the troughs can be, u »the Durohetrom des during the initial aaiun * you processing · 'V, loaded «» STA, & * & · before daa au processing · Workpiece complete

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In the initial stage of machining, the hips 255 are close the workpiece 203 and the Hinnen 257 have a pretty, large distance from the workpiece. Depending on the profile of the electrode, it is possible that between the electrode and the workpiece are large channels through which the Electrolyte flows through it without entering the narrow processing space 235, which is present near the high ribs 255 at this time. There can therefore be a pressure drop of the electrolyte, which is detrimental to the proper functioning of the device.

As soon as the machining has progressed so far that the Hinnen 257 are close to the workpiece, the flow is through of the electrolyte again take place in such a way that the electrolyte under pressure over the entire surface of the forming electrode flows.

The electrolyte supplied under Druok via tubes 231 arrives also under pressure via the passage 246 located between the housing 221 and the circumference of the disk 212 and the holder 213 into the chamber 225. A seal 24'7 surrounds the plunger 217 and enables its gliding. It can also be a dioh between the lower 3? "il of the housing 221 and the" insulating wall 205 be present.

The pressurized electrolyte intended for the machining area 235 also reaches the chamber 225 so that the pressure exerted on the electrode 201 by the electrolyte in the machining area is partially compensated for by the counter pressure on the rear surface 226 This holder 213 is exercised by the electrolyte located in the chamber 225. The pressure exerted on the plunger 217, the effect of which is noticeable on the pre-lifting devices of the electrode, '1st / ttooreiisOh. similar to the product from the middle Druok d'a. electrolyte in the. ■ Workday room 235 multipllsi @ rt »It & * b cross section *, des 21 ?, as for di® section® i © 2? lüe & troäe »'which are not in 0-0 9 * 38 / 1-3 t 2

the extension of the plunger, the pressure on the The front surface is compensated by the pressure on the Posterior surface 226.

If the pressure of the electrolyte changes, e.g. by throttling the supply, the pressure drop in the electrolyte practically occurs at the same time in the processing space 235 and in the chamber 225, there is a connection between the chamber 225 and the Room 235 via passage 246 exists. Any danger one Overcompensation of the system by a pressure drop in the processing space is prevented in this way and as a result There is also a risk of damage to the electrodes and the workpiece through unintentional contact | prevent.

Power is supplied via cables 249 and 251 (FIG. 2), which connect the electrode 201 cathodically with respect to the workpiece 203 do.

The inner surface of the table 204 is covered with an insulating layer 253 covered by which short circuits are prevented. Bridge 219 is also insulated to prevent electrical crossings Current into the feed device of the electrode prevent.

FIGS. 3 to 5 show a modification of the described embodiment *, wherein corresponding parts have the same reference numerals increased by 100, are indicated.

In this embodiment, the electrode 301 has alternating ones Slots 336a and 336b leading to the exit channels 337, while the disc 312 is arranged alternately has horizontal channels 339a and 339b. The channels 339b lead to openings 316 of the disc 314 so that the electrolyte between each channel 339b and a radial channel 341 which opens into a vertical channel 343 can flow. The channels 339a are not connected to the radial channels 341 through openings. 009838/1342

The horizontal channels 339a extend to the rare walls of Soheibe 312 to mouths 344 (Mg .. 4) for receiving the to form pressurized electrolytes from the Space 346 between the disk 312 and the housing 321 exits.

In this way the electrolyte gets into the processing room Introduced over all the slots 336a and flows out of this space through the .Schlitze 336b, so that a distribution of the feed of the electrolyte takes place relatively evenly over the entire surface of the electrode. This arrangement is , Cheaper than the arrangement shown in Figs. 1 and 2, because it prevents depletion of the electrolyte near the Central surface of the electrode.

To achieve an opening of the machining area and of Openings 344 on the circumference of the holder 313 could be a useful modification of the insulating piece 305, for example Shaping. In this case the plunger should at least a vertical channel 343 for feeding the electrolyte through appropriate horizontal channels up to the slots 336a and at least one other channel 343 that passes through horizontal channels up to the slots 336b in connection to secure the drainage of the electrolyte.

Such a modification requires two separate feeding devices for the liquid electrolyte to be present from which one device supplies the processing space via at least one vertical channel 343 of the ram 317 and the other supply device directs the liquid through the pipe 331 into the chamber 325 in order to reduce the compensation pressure on the upper surface 326 of the holder. .

In this case, devices must also be available that regulate the fluid pressure in chamber 325 to allow a rapid pressure drop in that chamber in the event of a sudden

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Pressure drop in the machining ridge 335 takes place. This could be achieved by a valve connecting chamber 325 to the drain and actuated by a pressure gauge
that shows the pressure in the machining area.

Patent claims:

009838 / 13A2

Claims (11)

-10- A 1171 Pa te η t β η s ρ r ü c h e 1948731 electrolytic processing device according to patent specification . ■ -... .... (Patent application P 18 07 266.7), marked by a stress compensation device comprising a housing (221) which encloses the cathode (201) and the workpiece (203) and forms a closed chamber (225) located behind the cathode, which is provided by feeding devices pressurized electrolyte is supplied which exerts a pressure on the cathode (201) which is at least partially compensates for the pressure that tries to generate the retraction movement between the cathode (201) and the workpiece (203). 2. Apparatus according to claim 1, characterized in that the Cathode (301) has several channels (337, 339) reaching up to the processing space (335), of which certain channels (339a) are used Feeding the electrolyte to the space (335) and other channels (339b) for discharging the electrolyte from the space (335) to serve. 3. Device according to Anspruoh 1, characterized by a passage (246), which establishes a connection between the processing space (235) and the chamber (225), 4. Device according to claims 1 and 3, characterized in that the processing space (235) flowing through Electrolyte at least partially the Durohlaß (246) and the Cathode (201) flows through channels (237) traversing the cathode. 5. Device according to claims 1, 3 and 4, wherein the working surface of the cathode has grooves and ribs, of which as ribs in close proximity, the workpiece are in front of the grooves and the feed channels of the electrolyte both in the ribs and in the open gutters, characterized by means which interrupt the supply of the Elektrolytenüberdie in the grooves (257) debouching channels bia the grooves (357) in the immediate vicinity of the workpiece (203) befin ^dea V 009838/1342. ₆ 6. Device according to claims 1 ^ i ⁸ 4 · »characterized in that the electrolyte flowing through the processing space (235) flows out of this space through the channels (236). 7. The device according to claim 1, characterized in that the cathode (201) carried by the end of a plunger (217) ■ that protrudes into the housing and that against the housing (221) is sealed by a seal (247). 8. Device according to claims 1 and 7, characterized in that the plunger (217) passages (243) for the Has passage of the pressurized electrolyte. 9. Device according to claims 1, 7 and 8, characterized by a plurality of channels passing through the cathode (201) (236, 237, 239), which connect the processing space (235) with the passages (243) of the plunger (217). 10. Device according to claims 1,7 ,. 8 and 9-, characterized by a passage (246) connecting between the processing space (235) and the chamber (225). 11. Device according to claims 1, 5 to 10, characterized that the electrolyte flowing through the processing space (235) at least partially the passage (246) and the channels (237) passing through the cathode (201) flows through. 009838/1342 , ■ * · ■. ■■ Blank page