SU1541016A1 - Apparatus for regulating powder of cutting - Google Patents

Abstract

The invention relates to mechanical engineering and can be used in turning control systems. The aim of the invention is to increase productivity by being able to process at the highest possible power of the main drive. To do this, in the control device, using the dials 9, 10, 11, 12, 13 and 14, the rotational speed limits of the main drive 1 and the drive force 3 of the feed are set using two comparison blocks and four summation blocks, multiplier, limiting circuit, two dividers processing modes are set in two to maximize the power of the main drive. 1 il.

Description

The invention relates to mechanical engineering and can be used in turning control systems.

The purpose of the invention is to increase productivity by being able to process at the highest possible power of the main drive.

The drawing shows the functional diagram of the device

The cutting mode modulating device contains the main drive 1 with the rotational mechanism of the workpiece 2, the drive 3 feeds with the mechanism for moving the toolholder 4, the rotational speed sensor 5, the tachogenerator and the controller for rotational speed 6 of the main drive 1, the cutting force sensor 7 installed in the toolholder 4, and the feed regulator 8 connected to the feed drive 3, the first setpoint device 9 of the smallest rotational speed, the second setpoint adjuster 10 of the highest frequency of rotation of the main drive, the third settingter 11 of the smallest feedthrough fourth setter 12 the largest feed, the fifth unit of cutting power 13, the processed diameter sensor 14, multiplication unit 15, the outputs of which are connected to the outputs of sensors 5, 7 and 14, the first matching element 16, the outputs of which are connected to the setting unit 13 and the output of multiplication unit 15, the output via an analog switch 17 is connected to the input of voltage regulator 18; such a regulator uses, in particular, a potentiometer with a micromotor, the first summation element 19, the first input of which is connected to the voltage regulator 18, and the second input through The second divider 20 is connected to the output of the summation element 21, a two-limit voltage limiter 22, the operating input and output of which are connected to the inputs of the comparison element 23, the summing element 24, the first input of which is connected to the output of the comparison element 23 via the amplifier 25, the summing element 26, the output of which is connected via a divider 27 to the second input of the element 24, a two-limit threshold circuit 28, the working input of which is connected to the output of the summing element 24, and the output to the control input of the key 17. The dials 9 and 10 are connected by the inputs of the elements NTA 26 gum

0

five

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five

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five

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five

and the driver inputs of the threshold circuit 28, the communication of the setting units 11 and 12 with the inputs of the summing element 21 and the driver inputs of the two limiter 22, the output of the summing element 24 is connected to the frequency controller 6 of the main circuit 1 and the output of the limiter 22 and Torus 8 filing.

The device works as follows

Depending on the permissible ranges of variation of the rotational frequencies of the main drive 1 and the feed rates, the limit values of the rotational speeds of the main drive 1 are entered into the device with the help of adjusters 9-12; setting device 9 - minimum frequency value (nwl) H) 5 setting unit 10 - maximum frequency value (nMakc), setting unit 11 - minimum supply value (SMMH), setting unit 12 - maximum delivery amount. Further, on the basis of preliminary calculations of the experimental experiments, the required cutting power (N) is determined and set using the setting device 13. When the PAIL and PM system is turned on (the CS sets the lower and upper response thresholds of the threshold circuit 28 and is summed by the summation element 26. The output signal of the latter is divided by two divider 27 and becomes numerically equal to n - the average value of the allowable range of rotational speed of the drive 1. Pass through the summation element 24 and add in it with the value of D, which at this moment nt is equal to zero, the signal n is fed to the regulator 6 of the frequency of rotation of the main drive 1 and causes it to rotate at the frequency n. Simultaneously with this setting unit 11 and 12, the 8MIN and, i.e., the lower and upper limits on the output signal of the two a voltage limiter 22, and summed by the summation element 21. The element output signal

The 21 summation is divided by two divisor 20 and becomes numerically equal to

S is the average value of the allowable range of change of the feed. Adding the summation element 19 with the signal 4S ,, which is currently zero, the signal S passes through a two-limit stop

22, a supply controller 8 is supplied 4a and causes the drive driver 3 to operate at a rate that supplies S. At the output of the threshold circuit 28, the signal is one and key 17 is on.

As soon as the drives start to work, sensor 5 outputs a signal n, characterizing the actual rotation frequency of the main drive 1, and sensor 7 outputs a signal characterizing the cutting force P2. These signals are multiplied with each other and with the signal entered by the sensor 14 of the processed diameter with the help of multiplication unit 15, the multiplication result characterizing the actual cutting power N, is compared by the comparison element 16 with the signal of the specified power N supplied from the unit 13, and forms the signal 4N N - N ,. Passing through the key 17 and the regulator 18, an amendment to the 4S supply is given, the value of L5 changes (increases or decreases depending on the sign of the DM) and, adding summation element 19 to the signal S, thus forming the signal SS + D5, passes through the voltage limiter 22, and adjusts the feed rate of the toolholder 4. The correction continues until the cutting force P2 changes in such a way that Nf. Then / 3N will become zero, at the output of the voltage regulator 18 the signal will be equal to D5, ensuring the indicated equality.

Thus, the system works. If the specified power lies in the range of values to which the flow corresponds, not going beyond the limits of mm and max. ° If power N lies outside this range, then the operation of the system proceeds somewhat differently. When S + AS at the output of the summation element 19 exceeds 5 s (the xylia becomes less than S / VIMrt, the output of the limiter 22 is SMC (V.C or

JM .H

. By arriving at comparing element 23, the signals S + AS and Zmax or SMMrt are converted in it so that at its output the signal is S + DZ - SMC (KC or S-dS - SMHH. Passage through the matching amplifier 25, this signal will become equal to An, different from the Kum Sum cum from p in element 24 of summation, it will be equal to n rf + An and using frequency control 6 will adjust the frequency of rotation of the main drive 1, the correction will continue until sensor 5 emits a signal n , ensuring the equality of N N. Thus, the system works, if N lies in the range, which y corresponds to n, satisfying the relation pmin n PMO (CS. In the case when n appears less PMn or more PMCs, the signal n input to the threshold circuit 28 will trigger it, expressed in sienna of the output signal Unit, Key 17 turns off, 4N becomes zero, voltage regulator 18 stops working and further change stops.

The operation of the device is possible without any restrictions, a priori imposed on the power. Any power can be entered into the device. If, in order to ensure that N and N f are equal, it is sufficient to change the feed within the permissible limits, the device will do so. If the change in supply is not enough, the device will change the frequency of rotation of the main drive 1. If the frequency control limits are also not enough, the device will set the limit values for the frequency of rotation and supply, and hence the power closest to the best, not going beyond the allowable limits.

Claims (1)

Invention Formula A cutting power control device containing a main drive, a main drive speed sensor, a feed drive, a feed control for a machine tool, the output of which is connected to the feed drive, a first comparison element, a cutting power setting unit, the output of which is connected to the first input of the first comparison element, A cutting force sensor and a second reference element, characterized in that, in order to expand the range of power control, the device is equipped with a controller, a two-limit voltage limiter, ticks of the highest and lowest feed rates, control devices for the highest and lowest rotational speeds of the main drive, the first, second, third and fourth summation elements, the first and the second dividers, a multiplier, an amplifier, a key, a two-limit threshold circuit, a frequency control for the rotation of the main drive and a sensor of the diameter being processed, the second input of the first comparison element connected to the output of the multiplication unit, the first input of which is connected to the set diameter generator, the second the input of the multiplier unit is connected to the cutting force sensor, and its third input is connected to the rotational speed sensor, the output of the first comparison element is connected to the first input of the key, the output of which is the key input is connected to the first input of the first summation element; the key input is connected to the output of the dual threshold scheme; the second input of the first element; the summation through the first divider is connected to the output of the second summation element, the first input of which is combined with the first input of the two limit voltage meter and is connected to the admitter of the minimum supply value, the output of the two limit voltage limit is connected to the supply controller and to the first input of the second reference element, the second input of the second sum element This is combined with the second input of the two limit voltage suppressor and connected to the setpoint of the maximum supply value; 5 of which is connected to the frequency controller and the first input of a two-limit threshold circuit, the second input of which is connected to the first input of the fourth summation element and the setpoint device 0 minimum frequency, the third input of the two threshold threshold circuit is connected to the maximum frequency setting and the second input of the fourth summation element 5, the output of which is connected to the second input of the third summation element through the second divider, the frequency controller output is connected to the main drive.