SU1305838A1 - Device for electrochemical machining of articles - Google Patents

Abstract

This invention relates to the electrochemical treatment of articles. Introducing the key 2, the pulse generator 8, the coincidence element 10, and the flip-flops 9 and 11 into the device simplifies it and increases its reliability in operation. 3 il. with about joint venture 00 from 00

Description

This invention relates to electrochemical machining, in particular, low power devices for electrochemical machining of articles.

The purpose of the invention is to simplify the electrochemical processing device and increase the reliability of its operation.

Fig, 1 shows a block diagram of the device; FIGS. 2 and 3 are timing diagrams explaining the operation of the device.

The diagrams (figs. 2 and 3) show: a - voltage of power source 1; b - generator output 8 pulses (setting trigger 9 into one, state); c - trigger output 9; g - key 2 state (when trigger 11 is turned on); e is the current through the electrochemical bath 3, the voltage at the output of current sensor 4; e is the frequency at the output of the converter 6; W - the number of pulses in the counter 7; h - counter output

7 (setting trigger 9 to zero); I - nominal voltage; 11 - low voltage.

The device contains a power source 1, a switch 2, an electrochemical bath 3, a current sensor 4, a current integrator 5 consisting of a voltage-frequency voltage connected in series with a converter 6; and counter 7, generator

8 impulses, trigger 9, coincidence element 10 (performed, for example, on an AND gate), second trigger 11, in which the unit installation input (conventionally in the Start drawing and the installation zero input (conventionally in the Stop drawing) are connected to the control buses (not shown ).

The output of the power source through a switch 2 is serially connected to an electrochemical bath 3, a current sensor 4, the output of which is connected to the input of a series-connected voltage-frequency converter 6 and a counter 7 of the current integrator 5, the output of which is connected to the first input of the trigger 9, the second input of which is connected with the output of the generator 8 pulses, and the output of the trigger 9 is connected to the first input of the coincidence element 10, the second input of which is connected to the output of the trigger 11. The output of the coinciding element 10 is connected to the input of the key 2.

The device works as follows.

five

0

five

0

five

0

five

0

five

When the device is turned on to the network by an initial setup (not shown), the counter 7 and the triggers 9 and 11 are set to zero logic. At the same time, zero (prohibiting) signals are fed to the inputs of the coincidence element 10, and a zero signal is generated at the output of the coincidence element 10, which also sets the key

2c. the open state prevents the passage of current through the electrochemical bath 3.

Then set the mode-processing parts. For this, depending on the required intensity of the process, the size of the workpiece, etc. The coefficient N is recalculated from the counter 7. Next, by a command sent to the unit installation input (conditionally Start) trigger 11, for example, trigger 11 switches from one button to one state and an enable signal arrives at the corresponding input of the coincidence element 10.

At the same time, the first pulse produced by the low-frequency pulse generator 8 (Fig. 2b), the trigger 9 is switched to one state (Fig. 2c) and the key 2 through the coincidence element 10 is set to the closed state (Fig. 2d).

As a result, the power source 1, which is, for example, an unstabilized rectifier, is connected to an electrochemical bath Zr in which the workpiece is pre-installed — an anode immersed in the electrolyte for a certain distance from the cathode (located in the bath

3 and not shown in the drawing).

The electrochemical process begins. The electric current flowing through the bath 3 creates at the output of the sensor 4 a voltage proportional to the value of this current (Fig. 2e),

The voltage converter 6 is often a pulsed pulse (FIG. 2e), the frequency of which is proportional to the signal received from current sensor 4 and, consequently, the current intensity of the electrochemical process. When 7 N pulses arrive at the counter, where N is the coefficient (}), the recalculation counter of the counter 7, the latter gives a signal Sfg.2) to the trigger reset 9 and converts it to the zero state (Fig. 2c), while the logical zero output

313058

the trigger 9 through the element 10 coincidence sets the key 2 to the open state. As a result, the current in the circuit of the electrochemical bath 3 is stopped,

The device is in such a state until the next cycle j, the beginning of which is determined by the arrival of the next pulse of the low-frequency generator 8 pulses.

Thus, the current flowing fO through the electrochemical bath 3 ne

Periodically, at the frequency of the low-frequency pulse generator B, it is interrupted. The duration of the flow of current through the electrochemical bath 3 is determined by the filling time of the counter 7j and, for a given conversion factor N of the counter 7, by the average value of the flowing current.

f5

ow, and therefore, for any period of time, T is constantly

H 1G i const,

where i is the average current value

time t As a result, the thickness of the removable

If, for any reason, the metal details of the metal layer are proportional to the processing time with a i cf t

If the current flow through the electrochemical bath 3 (Fig. 2 II h; Fig. 3), for example, when the mains voltage fluctuates, the temperature of the electrolyte changes, etc., the voltage of the current sensor 4 and the frequency of the converter 6 decrease accordingly As a result, counter 7 is filled for longer, i.e. the duration of the flow of current through the electrochemical bath 3 is increased. At the same time, the maintenance of the average current and the intensity of the electrochemical process is maintained.

After the end of the specified processing time by a command supplied, for example, from a button (not shown) to the zero setting input (conventionally Stop) of the trigger 11, the latter is switched to the zero state, prohibits the passage of signals to the output of the coincidence element 10 and sets the key 2 to the open state the The electric bath 3 is de-energized and the processing of the part is stopped.

The average current for the period T of the generator 8 pulses is determined by the formula

t idt

-G const

. ...

V-T

JCN

T T

since K const, N const, T const.

where 1 is the average value of the current 5 D of the coincidence element, inputs of the input time T; q is the amount of electricity that has passed during T through bath 3;

first trigger are connected respectively to the outputs of the current integrator and the pulse generator, and the output of the coincidence element is connected to the control

f is the instantaneous value of the frequency converter 6;

K is the current-to-frequency conversion factor;

N is the conversion factor of the counter 7 (the number of pulses; during the control, the electrochemical bath 3 is turned off).

Thus, the average value of the eye for the period T of the generator 8 impulse

ow, and therefore, for any period of time, T is constantly

H 1G i const,

where i is the average current value

time t As a result, the thickness of the removable

 Details of the metal layer

on the processing time with a i cf t

H

H t

S

t

where C is the electrochemical equivalent of the metal part; output, by current; processing time; the area of the workpiece surface; metal density. Moreover, if we assume that C, 1, S, –r are constant, then it is proportional to t.

Thus, the required thickness of the removed metal layer can be specified by the duration of the electrochemical treatment process.

Claims (1)

Invention Formula A device for the electrochemical treatment of products containing a power source, a series-connected electrochemical bath, a current sensor, a current integrator including a series-connected voltage-frequency converter, and a meter characterized by topics That, in order to simplify the arrangement and increase its reliability, a key, a pulse generator, a coincidence element and two flip-flops are entered into it, the outputs of which are connected to the inlet flip-flop are connected respectively to the outputs of the current integrator and the pulse generator, and the output of the coincidence element is connected to control - five . 1305838 I6 To the key input connected between the bath, the inputs of the second trigger by the power supply and electrochemical are connected to the Start and Stop buses.  tshshshshp ashshshtt .. iputZ Compiled by M, Leonova. Editor G. Gerber Tehred M. Khodanych Proofreader A, Obruchar Order 1464/54 Edition 902 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4