SU1200247A1 - Two=coordinate servosystem for electric spark alloying installation - Google Patents

Abstract

TWO-ORDERING FOLLOWING SYSTEM OF ELECTRO-SPARKELING MEASUREMENT INSTALLATION, containing an electrode, a generator of measuring pulses and a control channel in the distribution channel; pulse generator and a drive, which means that, in order to increase the processing accuracy of a given mode, a strobe generator, a control trigger and a delay control element, a first digital-to-analog transformer and series-connected comparison unit, a definition unit are inserted into it the second digital-to-analog converter and the differential amplifier; the first control channel is also entered into the first pachKH pulses block, and the second has the And element and the trigger, the output of the And element is connected to the input m trigger, pervybg the output of which is connected to the first input of the pulse distributor with the second input of the block; determining the sign and through the delay element — with the first input of the first and second input of the second digital-to-analog converters, with the first input of the comparison unit and with the third input of the sign determining unit; the comparison unit of the second output is connected to the second input of the first and third inputs of the second digital-analog converters, third the input of the first digital-to-analog converter is connected to the second output of the sign determining unit, the third output of the pulse distributor connected to the second input, the outputs connected to the second and third inputs of the comparison unit, the second output of the trigger is connected to the third input of the pulse distributor, a fourth input of which is connected to the output of the measuring pulse generator, to the first input of the first pulse distributor (I channel and to the first input of the output pulse selection unit, the fifth input - with the output of the electrode, with the second input of the pulse distributor of the first channel and with the second input of the selection unit of the first burst, N9 whose third input is connected to the output of the strobe generator, to the third to the path of the pulse distributor of the first control channel E, to the control trigger input to the sixth input of the first channel pulse distributor and to the first input of the second control channel element I, the second input of which is connected to the fourth input of the first channel pulse distributor n to the first control trigger output, second second connected to the fourth input of the pulse extraction unit of the first packet of pulses, the output of which is connected to the first input of the first channel comparison unit, the first and second outputs of the distribution pulse divider first

Description

They are connected to the second and third inputs of the comparison block, the fourth input of which is connected to the third OUT of the pulse distributor of the first channel, to the second input of the sign definition block and through the delay element to the fifth comparison block, to the third input of the second sign definition block a digital-to-analog converter and to the first input of the first common analog converter, the second input of which is connected to the second output of the first channel comparing unit and to the third input of the second digital-analogue ones A converter whose output is connected through a differential amplifier to the first output of the system, the fifth input of the pulse distributor of the first channel is connected to the third output of the sign determining unit, the outputs of the first and second digital-to-analog converters are connected to the second output of the system, the output of the first diffro-analog converter The first channel is connected to the second input of the differential amplifier of this channel.

one

The invention relates to electrophysical methods of processing materials and can be used for automatic electrospark hardening and restoration of complex profiles, in particular vertical walls of cutting edges of punching dies, various types of knives, etc.

. The known automatic installation for electric-spark hardening and restoration of forging dies of die forging with a complex configuration in terms of matching horizontal and inclined walls with two C 11 electrodes.

Along with the advantages of this installation (high-performance and high-quality processing), it has inherent disadvantages.

It is significantly difficult to process the vertical walls of cutting dies with a small working volume, and sharp corners of the profile, the turn in which the two electrodes is practically impossible.

Also known is a tracking system for machine tools with software control, comprising a coping device, a control device, a switch, measuring units according to coordinates, and outputs connected to the inputs of pulse generators 2.

However, the known system has a limited scope as it does not provide high accuracy.

2

maintaining the constant distance of the electrode from the vertical wall of the workpiece, and the constant speed of bypassing a complex contour,

those. does not provide accurate processing of the specified mode.

The aim of the invention is to increase the productivity and quality of doping in the vertical walls of complex profile edges, increasing the accuracy of processing a given mode.

The goal is achieved. .

By introducing a strobe generator, a trigger trigger and a control element, a delay element, a first digital-to-analog converter and sequentially in the two-coordinate tracking system of an electrospark doping installation containing an electrode, a measuring pulse generator and in each control cable; a pulse distributor and a drive.

connected to the comparison unit, the sign determining unit, the second digital-to-analog converter and the differential amplifier, in the first control channel, in addition, a unit for separating the first batch of pulses is inserted, and in the second, the And element and the trigger, the output of the And element is connected to the trigger input, the first output of which connected to the first input of the impulse distributor. owls, with a second input block

neither the sign and the delay element with the first input of the first and the second input of the second digital-to-analog converters, with the first input of the comparison unit and with the third input of the sign determining unit, the comparison unit of the second output is connected to the second input of the first and to the third input of the second digital-analog converters, third input the first digital-to-analog converter connected to the second output of the sign determining unit, the third output of the pulse distributor connected to the second input, the outputs connected to the second and third by comparison block moves, the second trigger output is connected to the third input of the pulse distributor, the fourth input of which is connected to the output of the measuring pulse generator, to the first input of the pulse distributor of the first channel and to the first input of the selection unit of the first packet of pulses, the fifth input to the output the electrode, with the second input of the pulse distributor of the first channel and with the second input of the first pulse selection unit, the third input of which is connected to the output of the strobe generator, to the third input of the distributor the first control channel, to the control trigger input to the sixth input of the pulse distributor of the first channel, and to the first input of the second control channel element, the second input of which is connected to the fourth input of the first channel pulse distributor and to the first control trigger output, the second output connected to the fourth the first and second outputs of the pulse distributor of the first channel are connected to the input of the pulse block of the first pulse train, the output of which is connected to the first input of the first channel comparison block respectively, with the second and third inputs of the comparison unit, the fourth input of which is connected to the third output of the pulse distributor of the first channel j with the second input of the sign determining unit and through the delay element to the fifth input of the comparison unit with the third input of the sign determining unit, with the second input the second digital-to-analog converter and the first input of the first digital-analog converter, the second input of which is connected to the second output 474 of the comparison unit of the first channel and to the third input of the second digital-analogue A converter whose output is connected to the first output of the system through a differential amplifier, the five inputs of the pulse distributor of the first channel are connected to the third output of the sign determining unit, the outputs of the first and second digital-to-analog converters are connected to the second output of the system through the second digital-to-analog converter -g the distributor of the first channel is connected to the second point of the differential amplifier of this channel. Fig. 1 shows a block diagram of a two-coordinate tracking installation system; Fig. 2 shows speed plans for the relative displacement of the electrode and the part; on fig.Z - block diagram. the selection of the first batch of pulses i in Fig. 4 is a diagram of a pulse distributor in Fig. 3 — an electrical circuit of a comparison unit J in FIG. 6 — a diagram of a delay element J in FIG. 7 — a diagram of a sign determining unit} in FIG. 8 a circuit of digital-to-analog converters; FIG. .9 - time diagrams of the installation operation with increasing spark gap, as compared with the given one} in figure 10 - time diagrams of the installation operation with decreasing the spark gap as compared with the specified one. The two coordinate system (Fig. 1) contains a working head 1, an electrode 2, a plate 3, an engine 4, a worm pair 5, a cam 6 of a cosine-sinus mechanism 7, 8 and 9, and rheostats 10 and 11; motors 12 and 13, two-coordinate table 14, as well as a strobe generator 15, a measuring pulse generator 16, a control trigger 17, a first pulse batch block 18, a pulse distributor 19, a comparison block 20, a delay element 21, a sign determining block 22, the first 23 and second 24 digital-to-analog converters of the first channel, differential amplifier 25, element 26, trigger 27, pulse distributor 28, comparison unit 29, sign determining unit 30, delay element 31, first 32 and second 33 digital-analog converters of the second channel, ifferentsialny amplifier 34.

Working head 1 (electromagnetic vibrator or rotational drive) with electrode 2 is fixed on plate 3 and is installed above part D in such a way that the electrode with its side surface touches the vertical wall of the part, for example, a die

On plate 3, an engine A is installed, which through a worm pair 5 can rotate the cam 6 of the cosine-sine mechanism 7, the pushers 8 and 9 of which are connected with the sliders of the rheostats 10 and 11, connected respectively to the motors 12 and 13 of the two-coordinate table 14, on which is installed part D.

The connections between the elements of the device and the direction of the signals are shown by arrows.

The unit 18 for allocating the first burst of pulses (FIG. 3) consists of element 4ID-HE 35 and a binary counter 36.

The distributor 19 of pulses (28) (FIG. 4) contains an element AND 37 and elements AND-HE 38 and 39, blocks 20 (29) of the comparison (FIG. 3) - elements AND-HE 40 and 41, inverters 42-44 and binary counter 45; items. 21 (31) delays (Fig. 6) - AND-HE elements 46 and 47 and inverters 48-53, block 22 (30) of the value (FIG, 7) - trigger 54, elements AND-NE 55-57 and inverters 5860 , and the digital-to-analog converters 23, 24, 32, and 33 (Fig. 8) contain binary counters 61 and 62 and the actual diffractive-analog converters 63 and 64,

The two-coordinate system works as follows.

When power is applied to the operating head 1, electrode 2 is brought into rotational or oscillatory motion and is brought into contact with the vertical wall of the stamp with part D with its main surface.

At the same time, technological current pulses are applied to the electrode .2 and by manual control of the table motors they set the spark gap size.

After that, the automatic controller is turned on.

In this case, the pulse meter generator 16 produces pulses that fill the pulses supplied to the automatic controller from electrode 2, and the time interval during which the number of measuring pulses corresponding to a predetermined number of pulses from the electrode (reference pulse train) is measured is determined by the duration of gates pulses produced by the generator 15 gates.

The duration of the gating pulses is chosen equal to 5-8 periods of the pulses of the electrode, and the duration of the measuring pulses can be set in the range of 0.1-0.05 pulse duration from the electrode.

These parameters provide sufficient accuracy to maintain the specified processing modes.

The first burst of pulses from the electrode (reference) is fed to the second input of the unit 18, in which,

During the first strobe pulse supplied to the third input of block 18, it will record the number of measuring pulses applied to its first input and the corresponding total pulse duration of the electrode of the first pack.

By the decay of the first strobe pulse, the control trigger 17 switches and, by supplying from the inverse output to the fourth input of the block 18 an interdiction level, thereby eliminating the possibility of further counting the measuring pulses by the block 18.

Thus, in block 18, the number of measuring pulses will be recorded, corresponding to the duration of the impulses: from the electrode in the first pack that will remain until the automatic controller is turned on.

From the direct output of the control trigger 17, the resolving level is supplied to the quarter input of the distributor 19 pulses, after which, starting from the second, the gate pulses applied to the third input of the distributor 19 from its third output are fed to the quarter (recording) input of the comparison unit 20, the front of which of block 18 rewrites the number through the first entry into block 20.

Simultaneously, from the second output of the distributor 19 to the (subtracting) input of the unit 20, the measuring pulses from the generator 16 measuring pulses pass, filling the pulses from the electrode during the second and after the blowing strobe pulses. Comparison of the numbers of measuring pulses that passed to the first and third inputs of block 20 occurs according to the decay of the strobe pulses. Thus, in block 20, the difference between the number of measurement pulses recorded during the first strobe pulse and the next (second, third, etc.) will be recorded in the window 20 of the strobe pulses. If the difference is positive (Fig. 9), means an increase in the spark gap, in comparison with the preset, then the strobe pulse applied to the second input of the sign determining unit 22 from the distributor 19, when there is no signal from the second output of the block 20 on the first input of the block 22, will pass to the first output of the block 22, on the second input digital channel gov The converter 23 will be recorded in it and its corresponding sign is amplified by the difference obtained by the differential amplifier 25.. If the difference obtained is negative (FIG. 10), which means reducing the spark gap, then from the second output of block 20 to the first input of block 22 a pulse is applied that switches the strobe pulse from the first output to the second and second rotor of the D / A converter 24 Simultaneously at the output of block 22, a pulse is produced in Vits, which, through the input of the distributor 19, switches its second output to the first. In this case, the measuring pulses will be fed to the second (summing) input of block 20, and the resulting difference in strobe decay will be recorded in the digital-to-analog converter 24 and amplified with a corresponding differential amplifier 25. Through the delay element 21 the front of the strobe-pulse is fed to the five block input 20 and the third input of block 22, and the strobe-pulse decay to the third input of digital-to-analog converters 23 and 24, resetting them to the initial state. The voltage from the exciter 25 is applied to the midpoints of the rheostats 10 and 11 and through the engines of the rheostats to the engines 12 and 13. Since the engines of the rheostats are shifted between themselves by 90, then the voltage is divided into two corresponding by the law of sine and braid, i.e. . nous In this case, the components of the velocities in the x and y coordinates, determined by these two parts of the voltage, have a magnitude and direction, the resultant of which is directed normally to the point of the surface being treated, and eliminates the mismatch in the magnitude of the spark gap. Fig. 2 shows a plan of the component speeds of the table for X and Y with increasing spark gap, and in Fig. 25 with decreasing, where v is the resulting rate of approach or removal of the electrode k. (From) the treatment surface, VXD and - her soe- mounts. The change of the velocities of the coordinate table along the axes m and y, which monitor the complex profile of the surface being processed, is carried out by the second channel of the automatic controller as follows. The first and third (every odd) strobe pulse does not pass through element 26 to the input of flip-flop 27. At the second output of flip-flop 27, the resolution level remains and is fed to the fourth input of the pulse distributor 28. In this case, the measuring pulses from the measuring pulse generator, fed to the first input of the distributor 28, pass to its first output and are fed to the first input (summing) of the comparison unit 29. Front of the second, fourth, etc. (even strobe pulses) passing through the And 26 element are transferred to the trigger 27 to the opposite state. In this case, the measuring pulses pass through the distributor 28 to the second (subtractive) input of the comparator unit 29. At the output of the comparator unit, a number appears corresponding to the difference in the number of measuring pulses that have passed during the odd and even strobe pulses, i.e. the comparison of the duration of the subsequent and previous bursts of pulses from the electrode occurs.

The sign of the difference obtained is determined similarly in the first channel by the sign determining unit 30, and its conversion and amplification is determined in digital-to-analogue converters 32 and 33 and the differential amplifier 34.

Similarly, as in the first channel, the strobe-pulses decay, the passage through the delay element 31 resets the blocks 29, 30, 32 and 33 to the initial state and the second channel is ready for operation by the arrival of the front gate strobe pulse.

 The voltage from amplifier 34 to the engine is a cosine-sinus mechanism 7, which, in accordance with the duration and sign of this voltage, turns cam 6, the sliders move through the pushers 8 and 9 of rheostats 10 and 11 in accordance with the position.

At the same time, the voltages removed from the rheostat engines vary according to the law of cosine and sine, thereby maintaining the resulting vectorial speed of traversing the contour of the part.

Fig. 2b shows the velocity plan for the relative movement of the contour of the part and the electrode with a positive difference, and in Fig. 2d, with a negative one.

Figure 2 shows a combined velocity plan for the relative movement of the part and the electrode in the presence of differential signals at the outputs of the first and second channels, the difference being negative at the output of the first channel, where VH is the resulting feed rate and v is the adjusted feed rate with v taken.

Thus, the proposed facility fully automates the electric-spark doping of complex vertical profiles of cutting dies, knives, ensuring the maintenance of the processing mode and the constant speed of circumvention of the contour complexity, high-quality and high-performance processing, greatly expands the technological capabilities

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Claims (1)

TWO-ORDINED NEXT ELECTRIC SPARK INSTALLATION SYSTEM, containing an electrode, a measuring pulse generator and a pulse distributor and drive in each control channel, which, in order to increase the accuracy of processing a given mode, a strobe generator and a control trigger are introduced into it control channel delay element, first digital-to-analog converter and series-connected comparison unit, sign determination unit, second digital-to-analog converter and differential the first amplifier, in addition to the first control channel, a block of extraction of the first burst of pulses is introduced, and in the second - the element And the trigger, the output of the element And is connected to the input of the trigger, the first output of which is connected to the first input of the pulse distributor *, with the second input of the block determining the sign and through the delay element - with the first input of the first and second input of the second digital-to-analog converters, with the first input of the comparison unit and with the third input of the sign determination unit, the comparison unit with the second output is connected to the second input of the first and the third input of the second digital-to-analog converters, the third input of the first digital-to-analog converter is connected to the second output of the sign-determining unit, the third output is connected to the second input ~ pulse distributor, the outputs are connected to the second and third inputs of the comparison unit, the second trigger output is connected to the third input of the pulse distributor, the fourth input of which is connected to the output of the measuring pulse generator, with the first input of the pulse distributor of the first channel and with the first input of the unit dividing the first burst, the fifth input - with the output electrode, with the second input of the pulse distributor per-. channel and with the second input of the selection unit of the first burst of pulses, the third input of which is connected to the output of the strobe generator, 'to the third input of the pulse distributor of the first control channel, to the input of the control trigger to the sixth input of the pulse distributor of the first channel to the first input of the second element control channel, the second input of which is connected to the fourth input of the pulse distributor of the first channel and with the first output of the control trigger, the second output connected to the fourth input of the pulse allocation unit of the first packet of pulses, the output of which is connected to the first input of the comparison unit of the first channel, the first and second outputs of the pulse distributor of the first channel SU 1200247 are connected respectively to the second and third inputs of the comparison unit, the fourth input of which is connected to the third output of the pulse distributor of the first channel , with the second input of the sign determination unit and through the delay element, with the fifth input of the comparison unit, with the third input of the sign determination unit, with the second input of the second digital-to-analog converter and with the first the input of the first digital-to-analog converter, the second input of which is connected to the second output of the comparison unit of the first channel and the third input of the second digital-to-analog converter, the output of which is connected through the differential amplifier to the first output of the system, the fifth input of the pulse distributor of the first channel is connected to the third output of the sign-determining unit , the outputs of the first and second digital-to-analog converters through a differential amplifier of the second channel are connected to the second output of the system, the output of the first froanalogovogo converter of the first channel is connected to a second input of the differential amplifier of this channel.