DE1440275A1 - Electrolytic cavity excavation device - Google Patents

Description

Patent attorneys;

1U0275

Dr. D. Thomsen H. Tiedtke G. Bühling

Dipl.-Chem. '' Dipl.-Ing. Dipl.-Chem.

8000 MONKS 2

VAL 33

TELEPHONE 0811/226894

TELEGRAM ADDRESS: THOPATENT MONKS '- ?. July 1988

Patent application P IH 40 275.6 M 2706

Anocut Engineering Company Chicago / USA

Electrolytic cavity excavation device.

The invention relates to electrolytic apparatus and method for cavity excavation, and more particularly to an apparatus and method for accurately forming a cavity in or through a workpiece Workpiece through.

It is the object of the present invention to provide a new and improved cavity excavation apparatus and method to create, by means of which the size and dimensions of the cavity within previously not considered possible tolerances can be controlled.

Other goals and benefits emerge from the following Description in conjunction with the drawings, in which are: '909820/0195

.1 © Documents (Art. 7, Paragraph I, Paragraph 2, No. 1, Clause 3 of the Amendment Act of 4.9.1S [67J

Fig. 1 is a schematic elevation of the complete

Contraption,
Figure 2 is a sectional view of the drive head assembly

of the device shown in Fig. 1, • Fig. 3 and M plan and elevation views of the

Dial indicator and the depth limit control connection which form part of the drive head are included in it and. 5 shows a schematic circuit diagram.

In Fig. 1, reference numerals 1, la, Ib and denote Ic various parts of a welding machine frame or base. On the base 1 is a more detailed in Figs. 2, 3, and the drive head 3 shown is attached. He trains im generally an electromechanical drive arranged in this way, around an electrode very evenly, constantly and precisely in it Working relationship to move a workpiece. It contains an upper housing 5 (Fig. 2.5 and a lower housing 7. From the lower housing 7 is a plunger 9 and a plunger head before, on which an insulating plate 13 and an electrode support plate 15 are attached. The * ram head and the ram are sealed against electrolyte by a closure 17 (Fig. Z) "

# V

A push rod 19 protected by a lock 21 connects the ram head 11 with a scale-like depth indicator

(Fig. 1). On the mounting plate 15 are a. Electrode 22 in a holder 25 and a feed tube 27 are shown. Electrical cables are also connected for work, but not shown.

The plunger 9 is supported for axial movement in ball bearing idler bushings 29 and is on the rotation, by a Prevented cross pin carrying needle roller bearings that run on hardened tracks (not shown).

A lead screw 31 and lead nut 33 cooperate to drive the plunger 9 forward and backward. the The lead screw is supported by thrust bearings 35 and radial bearings 37 that are conveniently attached.

The lead screw is driven by a chain wheel 39 by means of a chain Ul. An electric, springy in The locked position brake 43 is attached to the end of the lead screw 31. She is excited while running to apply the brakes loosen, but de-energized when stopping to stop the rotation of the lead screw and thus overtaking over the desired one To prevent border beyond.

The upper housing 5 contains the actual drive device. In Fig. 1 are a speed or forward

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thrust setting knob and the scale 45, one so arranged Tachometer 47 to indicate the rate of advance, a depth limit setting button 49, a signal lamp 51, to indicate the operation of the spark detector system and a signal lamp 53 is shown to indicate the operation of the later to be described depth limitation control system. .

In the upper housing 5 (Fig. 2), the chain 41 is driven by a sprocket 55 which, at higher or lower speed, runs forwards or backwards, as it is driven by the following device. A reversible motor M is driven by a variable speed VST transmission ^{controlled by} button 45 (Fig. 1) which operates through a linkage, not shown. A further reduction in speed is obtained through the step-down transmission 57. The output of the. Transmission 57 either at the same speed or at a much higher speed to the

■ *

Chain wheel 55 switched.

V ₁ - - ■

When clutch 65 is engaged, power is transmitted through stub shaft 58 to shaft 59 and from there off to the sprocket 55. When the other clutch 67 is engaged

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-S-

is moving, there is an increase in speed »because the Stuaroelwelle 58 drives the shaft 61 through a gear and pinion 69 and 71 (approximately 1: 1 ratio) and the force through ¹ the coupling 67 to a second gear and pinion 73 and 75 (about 3: 1 ratio) to the shaft 59 and from there to the drive sprocket 55.

. With this combination, the actual movement of the ram can be controlled from the very slow speed of approximately 0.254 mm (0.010 ") per minute to 19.5 mm (0.750") per minute, all in the low speed range, and then by electrical selection of the high speed range with about -12 times these speeds, ι The high speed range is principally used to set the electrode in relation to the workpiece.

The actual feed rate is shown on the tachometer 47 (Fig. 1) indicated by a conventional drive mechanism is driven, which (Fig. 2) contains a gear and pinion 77 and 79, and a flexible drive shaft 81. The speedometer is calibrated so that it can read directly cm per minute (inches / min) when the drive is in the slow speed constellation is located. .

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Reversal of direction is accomplished in a well known manner by electrically switching circuit connections to the motor M executed. The console C (Fig. 1) carries the following push buttons to control the drive button 3; Forward 8.3;, backward 85 j normal forward thrust (slow speed) 87; Rapid feed (high speed) 89; Run 91j jogging 93; Emergency stop 95.

Additional buttons on the console are: Pump "On" 97; Pump "off" 99; Heating "on" 101; Heating "off" 103.

Electrical cables 105 and 107 extend from the actual machine to console C, which can be moved to any convenient location near the actual machine is. . .

In operation, you first press either the forward or reverse button 83 or 85 and the associated relay circuits. (Time delay relays are used to control the "Full to full" - to prevent change of the motor direction, damage). This starts the motor M in the desired direction, but not the low speed clutch 65 nor the high-speed clutch 67 are already engaged. However, it is possible »to adjust the feed rate by using the HS control button

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and to be preset by referring to the tachometer 47. Then you choose slow (normal feed) or fast speed (rapid feed) by pressing the appropriate button. This pre-energizes the relay circuits to energize one or the other of the electrical clutches 65 or 67, but does not yet energize any. This only occurs when the "push" or "run" button 93 or 91 ™ is pressed, the "former only holding the circuit while the button is hand depressed and the latter (" running ") holding the circuit When either the "push" or "run" button is pressed, the electric brake 43 (Fig.) is released. The advance can be stopped by pressing the "emergency stop" button 95, whereby all Circuits are turned off or by pressing and releasing the "kick" button 93 which turns off only the run or run circuit, leaving the, A setting of "forward" or "reverse" and "normal feed" or "rapid feed ¹¹ ". The buttons may, where appropriate, contain integral integral indicator lights. The basic circuit diagram (Fig * 5) can be understood without further explanations by experts based on the previous description of the mode of operation.

The other elements on console C relate on the power supply of the direct current electrolyzing current.

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VM 1 shows the tension in the power supply, VM 2 shows. the voltage in the vicinity of the electrode and the workpiece. • where the difference between the two indicates the waste or loss from cables and lugs, etc. ' AM shows the current strength between the electrode and the work-

v piece passes through the electrolyte. In this regard, the control lamps PL 1, PL 2 and PL 3 indicate that the alternating current feed line · Is on so that the rectifier system is ready, with its vacuum tube controls are warmed up and that the direct current power supply to the working gap is actuated. Under PL 1 there are "On" and "Off" buttons 109 and 111 to set the To control rectifier controls and are located under PL 3 "On" and "Off" - buttons 1-13 and 115 to activate the " of the power relay in the rectifier system. In this way, force can be applied to the electrode and the workpiece without de-excitation the vacuum tubes of the control system on or off

> will. . The knob 117 controls the reference voltage to the - adjust the voltage supplied by the rectifier. The button 119 is the manipulation or sensitivity control of the spark detector circuit and can operate a potentiometer. "

In the present invention, it is desirable to keep the potential between the ^4th electrode and the workpiece fairly

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to keep exactly upright. This voltage, which usually falls between 5 volts and 18 volts, should be for best results be held within about one to five percent of the nominal preset voltage. To the extent that that there is any inadequacy of power supply regulation can of course be by manual adjustment of the tension control button 117 (Fig.'I) with reference on the voltmeter VM 2. It should be noted here that the receptacle connections that and feed influencing system, close to the electrolytic working gap for the best results should be established between the electrode and the workpiece. In this way, the tax managers can communicate with the not shown workpiece holding device and the electrode block or even be connected to the electrode itself. This way the control system becomes any. Compensate for voltage losses caused by IR losses in the cables and connections between the power delivery system and the working gap occur.

Referring to FIG. 1, a ground wire 121 is connected by the ram head 11 to the frame of the machine, so that the ram head always remains at the earth potential, itself if there is a break in the insulation of the insulating plate 13

OFtIGiNAL 909820/0195

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or any accidental contact between electrically excited parts of the electrode & y. srtems and the ram head enters «By using the cable 121, the passage of electrical; Rhinestones prevented or diminished by the bearings that support the ram head and which would be damaged.

Still referring to Fig. 1, the whole Drive head assembly mounted on dovetail cross slide, to permit horizontal movement of the entire drive head assembly in the direction towards and away from the drawing viewer. This arrangement is common and the Movement is brought about by manually operating the handwheel 123. A carriage lock is also provided and is controlled by handle 125. It blocks the movement of the Ram head, so that once a desired setting . has been achieved, this is not disturbed by accidental movement of the 'handwheel. 123.

A work table 127 is used to hold the workpiece made of stainless steel and placed on a vertical, attached by the handwheel 129 slide controlled * The The entirety of the vertical slide connection is against the Electrolyte by a collapsible one, not shown Rubber closure protected, which both on the work table as

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is also sealed to the bottom of a stainless steel basin located at an elevation just above the upper arch of the handwheel 129. This basin has side walls which, as shown, rise to a straight height extend under the bottom surface of the work table 127. The bottom of the basin has exit holes that allow it to be drained back into the electrolyte container 130. It an enclosure 131 for the work area is provided and arranged so that it extends into the previously described basin stainless steel can be lowered. Their front surface is opened by a sliding curtain and so is the same its upper surface can be opened by a similar curtain. The horizontal forward and backward movement of the Plunger and the drive head connection is supported by sliding interlocking locking plates that no Spray outlet is available. On the upper part of the envelope 131 and behind the drive head assembly a fan connection elbow 133 is arranged, which can be connected to a suction fan to remove any vapors, fumes or gases suck off. The inlet of this knee is protected by collecting plates, not shown, in order to prevent the inflow of strong liquid particles.

In the electrolyte supply system, the electrolyte container 130 made of stainless steel is provided with a diving

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Heater 135 equipped with control by a thermostat 137, which has an adjustment knob 139. The container ■ ter 130 is mounted on wheels 132, as shown, and es are permanently internal rails and guides 13.4 as part of the Welding structure 1 provided. Temporary guide rails 141 are stored behind the access door 143 and this can be attached with pins to form forward rails to facilitate forward movement of the container on these temporary rails and outwards on the floor for cleaning or operational inspection is. To allow this, the electrical connection is one of the connector type and the suction line from the The container to the electrolyte pump 145 is made by a standard quick release coupling 147 and a flexible hose 149. In the electrolyte container there is a cooling coil 151 which is fed with cold water by controlling the valve 153. An outlet line can lead to the Lead drainage system. The purpose of. Cooling coil consists in drawing excessive heat from the electrolyte under such Inferring circumstances where heavy machining and currents would otherwise cause the temperature to be undesirable increases ....

The electrolyte pump 145 is driven by a motor 155

driven and designed so that the electrolyte under

17.5 kg / cm ² or

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2 '2

a pressure of up to 17.5 kg / cm or even 21.5 kg / cm (250

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or even 300 pounds per square inch). from of the pump 145, the electrolyte passes through a filter 157, which is preferably arranged with quick release fittings allow easy removal to replace filter cartridges. It should be noted that both the container 130 and the pump 145 and its associated motor are located in compartments which are formed in the frame 1 and that these Compartments are normally closed by hinged access doors, for the purpose of explanation in this view are cut off. '

From the filter 157, the electrolyte enters through a hose line 159, through an electrolyte control panel By-pass valve 161, which is located in the vicinity of the right or upper part of the drawing, approximately above the middle part of the electrolyte container you can see. This valve serves as a bypass line to adjust the general pressure level and itself Adjust from time to time changes in the size and working areas of the electrodes being used. The back pressure, that is generated; by getting this bypass valve 161 has closed, is displayed on a pressure measuring device 163.

A T-connection is provided from the line 159 to the electrode valve J6,5, which controls the electrolyte in a manifold block 167 which is in the electrolyte basin and in

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the envelope 131 is attached. The filter 157 can optionally be inserted between the T-joint and the valve 165, and this arrangement is preferred. This manifold block may have a number of connections for easy connection of one or more electrolyte tubes to feed the electrode, such as the tube 27 shown in this illustration. A second pressure gauge 169 is also connected to the manifold block to provide pressure that is actually being delivered to the electrode. By adjusting the bypass valve -161 to produce the generally desired pressure and then adjusting the electrode valve 165, the pressure delivered to the electrode can be adjusted and maintained. If the electrode valve 165 is set so that the pressure in the manifold 167 will be slightly less than the pressure in the main supply line 159 (as indicated on the heater 163) as the electrode approaches the workpiece and an additional restriction of the electrolyte flow causes the pressure shown on gauge 169 to rise, and by referring to the decrease in the difference between the indicated pressures on the two gauges, the proximity of the electrode to the workpiece can be assessed. .

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Under ordinary circumstances it is desirable that the pressure is kept almost constant, although this is not is as critical as the rate of advance, the voltage or the temperature of the electrolyte. "However, if there is a sufficient change in pressure to reduce the degree of blistering in the working gap or really in the elec-

'ti

trode to influence significantly, then this will be the strict- ^ weaken ge work accuracy. Usually the operating pressure will not be less than 2 atmospheres and usually it will not exceed 20 atmospheres or 21.5 kg / cm (.300 pounds per square inch). A normal working pressure will be between 7.04 kg / cm ² and 14.08 kg / cm ² (100 and 200 pounds per square inch), but it is preferred, once the electrode is fully embedded in the workpiece, that the pressure be applied should not vary by more than 10% or 15% and under such conditions where maximum degrees of penetration are used and where the electrolyte in the working gap just tends to break out into vapor, even a slight pressure reduction would be uncomfortable. Meanwhile, a pressure increase of the order of 10% or 20% would create no problem. The control and measuring arrangement shown makes for easy control of the pressure in practice.

As shown, an outlet conduit 168 extends therefrom Valve 161 as a return to the electrolyte container 130 after

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down. In practice, at this point there is a hose loop, with a knee attached to its end, which usually releases the electrolyte back into the container. However, the hose can be accessed through an access door (not shown) at the right end of the machine and can be placed in a container or other receptacle will. Then, by operating the pump 145 and closing the electrode valve 165, the electrolyte can be sucked out of the container and easily emptied without the need to remove the container. The whole system can then, if desired, can be rinsed with water, using a hose which empties into the basin under the working pond and: that flows back into the container through outlet openings not shown. It's that way easy to rinse the whole system with fresh water and thereby minimize the cleaning problem.

Usually the heater 135 and her associated thermostat. 137 are arranged and adjusted so as to keep the temperature of the electrolyte sufficiently above the ambient temperature so that when the electrolyte is energized and therefore heat is given off in some other way (e.g. by pumping and by the passage of electric current in the working gap between the electrode and the workpiece)

90 9820/01 9 "5

the amount of heat provided by the heater 135 is automatically reduced by the thermostat 137. Accordingly, the heater can remain employed overnight to a temperature of the order of 54.4 ° C (130 ⁰ F) to maintain · If the real work begins, the pump and the passage of electric current will add energy to the electrolyte to the maintain a preset temperature with reduced stress on the heater 135. In some circumstances, where, for example, currents of the order of magnitude of 1..000 amps or more are passed between the electrode and the workpiece, the heat introduced in this way may be sufficient to raise the temperature of the electrolyte in the container above the desired level of, such as said it rises 54.4 ° C. Under these circumstances, tap water at a much lower temperature (usually in the range between 10 ° G and 20 ° C) is introduced by opening valve 153 so that water flows in cooling coil 151. By adjusting the valve 153, the amount of cooling provided can be adjusted to allow the intermittent action of the heater 135 by controlling the thermostat 137 to maintain the desired temperature. Because temperature control is important, a temperature measuring device 175 is provided. This is of the kind that has a tea temperature-sensitive piston 177 at the end of a

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has protected tube 179. The piston is like that in that Manifold 167 arranged so that it senses the temperature of the electrolyte very close to the electrode. .

If desired, the manual valve 153 can be replaced by a thermostatic valve so that the cooling coil 151 is controlled automatically.

Temperature control of the electrolyte is important to maintain the accuracy and it is preferred that, within about 10 ° or 15 ° is usually in the range of a depth of about 43.3 C to ^- (ILO ⁰ F) and a height of about 79 , 4 ° C or 82.2 ° C (175 ° F or 180 ° F). As previously indicated, a normal operating temperature will be on the order of 54.4 ° C (130 ° F). If the temperature is increased this will be under normal circumstances. would have the effect of causing greater activity of the electrolyte and, accordingly, greater erosion, with the result that the cavity that is created becomes somewhat larger than at a low temperature.

Thus, it can be seen that, in order to ensure accuracy, it is desirable to essentially use the following parameters to keep constant:

H40275

Ί · Tension

2. Feed rate

3. Electrolyte temperature

4. Electrolyte pressure

It can be seen that in the here described

Apparatus smock for controlling all of these parameters have been seen before * - M · If all of them are properly controlled. are, it is possible to produce holes which are -th sides ait the accuracy of a Gesaratfehlers on the order of 0.0508 mm (0.002 ") or less * However, _if: is the rise .Connect voltage and then drops the hole during that part of the passage during which the voltage was increased, it would be widened. Similarly, if the rate of advance were to be decreased the hole would be widened, or if it were to be increased, the hole would be made smaller Enlargement of the hole and a decrease in temperature reduce the size of the hole. With regard to the pressure, as previously discussed, it is possible to tolerate a wider range of changes if one does not work near the critical edge and one can consider the pressure to be particularly important because it affects the flow path, which in turn affects the actual electrolyte temperature in the working gap itself, although there are also some other effects

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acts associated with the generation of vesicles are. By keeping the pressure at an elevated level, the bubbles of the electrolysis gases, mainly Hydrogen and oxygen and vapor bubbles are kept small in size, thereby maintaining a high effective density of the electrolyte. When the pressure decreases the vesicles increase in size and the effective density is decreased, thereby increasing the effective resistance of the electrolyte grows and accordingly the tendency to reduce the el.ektrolysierenden current.

/ -

FIGS. 3 and 4 show a device for driving the scale indicator 23 shown in FIG. 1 and for actuating a depth limit switch. As such, the "dial indicator" can be purchased as a complete assembly from any of a number of well-known suppliers such as Federal, Ames or Starrett. It is indicated in FIGS The indicator includes a dial 23a and a pointer 23b which, on the dial indications, indicates a movement of the plunger head of 0.0254 mm (0.001 "). One complete revolution of the pointer 23b corresponds to 2.54 mm (0 ₉ 100 "). Not shown is a smaller pointer with its own inner dial, which roughly corresponds to the

909820/0195

small seconds dial is arranged on a clock. This smaller dial has indicators that are 2.54mm each (0.1 ") so that one complete revolution of this smaller pointer makes 25.4 mm (1") of movement. Subject the stroke of the device in general, shown here as 20.32 cm (8 "), a ruler-like scale 23c is provided, to show the general position of the ram head with respect to a pointer 23d. The usual button for setting the rotational position of the dial of the indicator is at 23e shown. ·

The scale indicator 23 is secured by screws 301 and a suitable bracket is attached to a frame member 303 which in turn is attached by screws or bolts to the upper housing 5 of the drive head assembly.

The frame 303 is drilled out to accommodate the push rod 19 slidable to include, and it is to be remembered that the push rod 19 is directly connected to the ram head 11, so that when the plunger is moved, the push rod 19 is moved with it. On the push rod 19 is adjustable Mounted carriage 305, which has an upwardly extending projection 307, which with the hardened button on the End of the drive element for the dial indicator 23 can come into engagement Here it is understandable that the dial

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indicator 23 one. Includes spring that urges the drive button to the right as shown in the drawing so that it any movement of the carriage 305 and its upwardly extending console 307 will follow.

A limit switch 309 is attached to the carriage 305 and has a drive button 311 * A second Slide 313 can be moved on two guide rods 319 mounted and arranged to be moved by rotation of the hand knob 49, also shown in FIG. The hand knob 49 rotates a shaft 317 in a suitable manner is mounted in brackets which are mounted on the frame 303 in order to rotate a sprocket 3 * 19 which drives a ball-and-socket chain 321. An idler sprocket 323, which is stored in a suitable manner, the chain leads at its opposite end. A spring 325 serves to take up any slack in the chain. The ends of the chain are attached to carriage 313 by small connectors 327 so that rotation of knob 49 causes carriage 313 to to move in a straight line. ''

A downwardly directed extension. 329 of the slide 313 holds a tubular push rod 331, which for telescopic sliding action over the support and guide rod 333 · On the tubular part 331 is a pointer

. BAD ORlGiNAL

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335 attached, the tip of which is on a scale-like Indicator 23c of the dial indicator shows · If, therefore, the button 49 is rotated and the carriage 313 moves, the pointer 335 also moves so that its position can be seen can.

When the push rod 19 moves forward (to the right f | 3 and 4) when the ram head advances against the workpiece, it moves the carriage 305 and limit switch 309 with it and, as shown in FIG. 3, is the operating button 311 of the limit switch arranged so that it is attacked by a front face of the carriage 313. The perimeter switch is in connected in such a way that it interrupts the holding relay circuits and the electrical couplings 65 and 67 in Fig. 2 invalidates and causes the elec- j tric brake 43 comes into engagement to stop the rotation of the lead screw 31 very quickly. The point at which this occurs when the ram is running, is determined by the position of the slide 313, because the further it moves to the left 3 and 4 show, the limit switch 309 must be moved by such a short distance before its operating button engages the frontal surface of the carriage 313.

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The adjustment knob 49 provides a convenient method of moving the carriage 313 and the entire steering linkage and the sleigh link actually prove that they sufficient to prevent the carriage 313. from moving, after being hired once.

In practice, the pointer 335 is only used as a rough guide for setting the depth limit control. After the decision has been made as to the depth to which the ram is to be moved, the ram is first moved to the depth with no workpiece in its path, its position being very carefully set to less than 0.0254 mm (.001 ") is set by the dial indicator and its pointer 23b. The adjustment button 49 is then operated to bring the carriage 313 against the depth limit switch 309 and this movement is continued until the indicator lamp 53 (FIG. 1) lights up, which indicates, that switch 309 has been activated, to be sure that the setting is accurate, knob 49 is then rotated to move carriage 313 slightly away from the switch and then rotated back again to very slowly move the carriage towards the limit switch bring to light up the indicator lamp back to the operation of the switch display. to check the accuracy of the adjustment, the plunger is now by something Pressing the appropriate control

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The button on the console is withdrawn and then advanced under force. If the adjustment has been carried out correctly, the ram head will stop in exactly the position determined by the position adjustment of the slide 313, and this can be confirmed by the reading on the dial 23a of the dial indicator. Periodically, the advance of the ram will be stopped within a fraction of a thousandth of an inch from the first stop.

This is used to make a series of cavities all at exactly the same depth without the need to rely on a worker to monitor the dial indicator and tries to fix the device exactly on that at every opportunity stop at the same point.

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Claims (1)

H40275 Pat tan sayings 1t method sum electrolytic excavation of a Cavity in an electrically .conductive, electrolytic erodable workpiece, characterized in that the workpiece and a hollow electrode are moved in a constant amount relative to each other, electrolyte through the Electrode and in a narrow gap between the electrode and the workpiece at a pressure that the Bubble formation in the electrolyte in the working gap minimizes the temperature of the electrolyte above the ambient temperature and at the same time a high-density low-voltage direct current between the electrode and the workpiece is passed in a direction * to to make the workpiece anodic * - 2. The method according to claim 1, characterized in that that the voltage is kept in the range of 5 to 16 volts will" . 3. The method according to any one of claims ί and 2, characterized characterized in that the relative degree of movement between 0.254 mm (0.010 ") per minute and 20.32 mm (0.800") per minute lies. · 4e. Method according to one of Claims 1-3, characterized in that the electrode against and into the workpiece New HA0275 is moved. 5. The method of any one of claims 1-4 characterized in that the pressure of the electrolyte is in the range of 2.1 kg / en ² to 21.5 kg / cm ² (30-300 pounds / in ² ). 6. The method according to any one of claims J-5, characterized M gekennseichnetι that the temperature of the electrolyte is in the range of 37.7 ° C to 82.3 ° C (100 ⁰ F to 180 ° F). 7. The method according to any one of claims 1-6, characterized in that the standby temperature of the electrolyte maintained at approximately 54.4 ° C (130 ° F). 8. The method according to any one of claims 1-7, characterized in that the temperature of the electrolyte means controlled heating and cooling units is kept at the desired height. 9. Device for carrying out the method according to claims 1-8, characterized by a device (127) for holding the workpiece, a hollow electrode, a device (15) for holding the electrode, a device to the Werketttckhalterungseinrichtung (127) and the 9098 2 0/0195 . - U40275 To move the electrode holder device in a constant degree relative to one another, a source for pressure electrolyte, conduction organs, which the electrolyte sources with the Electrode to deliver electrolyte to the gap between the Connect the work piece and the electrode, a device (161, 165) in the conduction organs for controlling the presence of the electrolyte, a device (135-, 137, 151) at the electrolyte source (130) to increase the temperature of the electrolyte ·. Trolyten to keep at a desired height as well as one with the workpiece and the electrode connected device for passing a low voltage direct current between the workpiece and the electrode in a direction to render the workpiece anodic. 10. The device according to claim 9, characterized in that the electrode is attached to a plunger (9) and the device for relative movement of the electrode and the workpiece has a motor (M) and control means (VST) variable speed connected for propulsion by the motor and means soft the speed control device: connects to the plunger (9) for driving the latter. 11 · Device according to claim 10; characterized in that the variable speed control device is a variable speed transmission (VST) 909820/01 9'5 U40275 includes, which is connected to the engine (H) and through it is driven, a pair of sprocket chains (69, 71, 73, 75), connected to the transmission and arranged to be driven therethrough, a clutch (65, 67) in each of the Gear chains, a control device for the clutches that can be operated to engage one or the other of the gear chains, and a common output gear (55, 41, 39) for the gear chains, which are connected to drive the ram (9). 12. The device according to claim II, characterized by a normally energized brake (43) acting on the tappet (9) to prevent its movement when the clutches (65, 67) are disengaged to prevent. 13. The apparatus according to claim 12, characterized in that the couplings (65, 67) are electrical couplings and the brake (43) is resiliently pressed into the braking position and is electrically drivable to the disengaged position when one of the clutches is engaged. 14. Device according to one of claims 9-13, characterized by a depth indicator (23) with a display device and a rod (33J) pushed into the extended position, a movable one against the rod crowded carriage (305), a guide device for the 909820/0195 IAD ORIGINAL U40275 Carriage and one with the carriage and the electrode holder connected push rod (19) such that the penetration depth the electrode in the workpiece can be seen on the display device (23). 15. The device according to claim 14, characterized by an adjustable stop (313) in the path of movement of the slide (305), a limit switch attached to the slide (309) and circuit means including the limit switch to the clutch control means to stop moving the electrode into the workpiece when it reaches a predetermined depth and on the other hand, to terminate the electrolyzing action of the device. 16. Device according to one of claims 9-15, characterized in that the electrolyte source is an electrolyte container (130) includes. 17. The device according to claim 16, characterized in that that the container (130) 'for movement in and out of the Device mounted on wheels (132). 909820/0195 HA0275 18. Device according to one of Claims 9-17, characterized in that the temperature holding device contains a heating unit (135) and a cooling unit (151). 19 * Apparatus according to claim 18, characterized in that the temperature maintaining means comprises a temperature of the electrolyte closely adjacent the entrance to the electrode ^ abfühlende thermostat means (137) and being connected so as to control the operation of the heating unit · 20 · Device according to one of claims 9-19, characterized in that the electrolyte source is a pump (145) contains, the line organs are connected to the outlet of the pump and the pressure control device a valve (161) to generate a counter pressure or back pressure on the electrolyte at the entrance to the electrode. 21. The device according to claim 20, characterized in that the back pressure generation event. (161) can be controlled manually. 22. The apparatus of claim 20 or 21, characterized in that the same includes a housing in which a 909820/0195 UA0275 first compartment (131) encloses the workpiece holder (127) and the electrode (22), a second compartment the drive unit. includes components of the device which moves the electrode and the workpiece relative to each other, a third Compartment contains the container (130) of the electrolyte source, with drainage means connecting the first compartment to the third Compartment connects to drain the electrolyte into the container (130), while a fourth compartment connects the electrolyte pump (145), wherein the conduit means and the valve means between the container (130) and the electrode (22) are switched. 909820/0 195