SU1276483A1 - System for adaptive control of grinder - Google Patents

Description

The invention relates to a machine tool industry and is intended for use on pshifovalnyh machines for multi-pass processing.

The aim of the invention is to increase productivity.

The goal is achieved by the method, the stabilization of the feed rate for plunging at the maximum technological level, ceteris paribus.

Figure 1 shows the functional diagonal control circuit of the grinding machine; Fig. 2 is a functional block diagram of the control; Fig. 3 is a functional block start circuit.

The adaptive control system contains a power parameter sensor 1 of the cutting process, a power parameter level adjuster 2 connected to an adder 3, the output of which is connected to the inputs of switch A, key 5 and the control unit 6, the outputs of which are connected to the control input of switch 4, key 5 and the start block 7. To the output of the key 5 a regulator 8 of the speed of the circle retraction is connected, the output is connected to the drive 9 of the circle retraction and the sensor 10 controls the speed of the retraction, the output connected to the third input of the control unit 6, to the second input of which connected to the output of the setter 11, the minimum longitudinal feed speed, and the fourth - the output of the sensor 12, feed speed. The output of the setting device 11 is also connected to the switch 4, the output of which is connected to the input of the feed rate regulator 13, which controls the longitudinal feed drive 14.

The control unit 6 has four inputs and two outputs. The first input of the block b is the null organ 15, the second and fourth is the comparator 16, and the outputs of the null organ 15 and the comparator 16 are connected to the input of the AND 17 logic element, the output of which is connected to one of the inputs of the memory element 18, output which is one of the outputs of the control unit 6. The third input of the control unit 6 is the one-shot 19, which is the second output of the block 6 and the second input of the memory element 18.

The start block 7 contains a memory element 20, to the outputs of which the stop buttons 21 and start buttons 22 are connected, logic gates NAND 23 and 24,

which are the start block inputs.

The memory elements 18 and 20 are made according to a scheme containing successively

included and feedback logical elements OR 25 and E 26,

The adaptive control system works as follows.

Before starting operation, switch 5 and two channels of switch 4 are open and the voltage from the adder output is not supplied to the controllers 8 and 13 "This is ensured by the fact that the signal at the output of the sensor of the force parameter is zero and therefore at the output of the adder 3 the signal is equal to the signal setpoint 2, the output of the null body 15 of block 6 and the output of block b is set to a logical signal

 Oh, and on the control input of the key 5 and the switch 4, the signal O is also set. On the second output of block 6 there is a signal I, which is fed to the first input of the start-up block 7 (to its logical element II-23)

At the output of the element AND-NOT 24 start block 7 and the output of the start block 7

0, a logical signal O is present, which is fed to the first control input of the co-mutator 4. When the start button 22 is pressed, the fourth input of the memory element 20 receives a logical signal 1, which is memorized and passed to the output of the start block 7. From the output of the start block 7, the signal 1 is fed to the first control input of switch 4. Due to this, the first channel of switch 4 is closed and connects the output of the adder 3 to the longitudinal feed speed controller 13, which controls the 14 o drive. The machine starts operation. The speed is maximum until the circle touches the details. At the beginning of the cutting process, sensor 1 of the power parameter raises the corresponding signal. When the signal of setpoint 2 is exceeded, a negative signal appears at the output of Totalizer 3. The output of the speed controller 13 begins to decrease, and the power parameter is stabilized at a predetermined level. When the feed rate is reduced to the minimum set by setter 11, which determines, at a constant sap rate, the level of feed per

A plunge, at the output of the comparator 16, a signal 1 appears. This results in the appearance of a signal 1 at the output of the element. And M, since the first input element And 17 already has 1, due to the negative signal of the adder 3 entering the input nullorgan 15. The first input of the memory element 18 receives 1, passing to the first output of block 6, is remembered and goes further to the second the control input of the switch 4 and the first input of the start-up unit 7. This resets the memory element 20 and causes the output signal of the start-up unit 7 of the logical signal O. At the same time, the first channel of the switch 4 is opened, the second channel and key 5 are closed. Thus, the controller 13 is connected to the setting device 11, and the controller 8 is connected to the adder 3. As a result, the controller 8 controls the drive 9 and the grinding wheel starts to retract the grinding wheel from the part. The longitudinal feed movement continues with a minimum feed. At the same time, the power parameter of the cutting process is maintained at a predetermined level by adjusting the speed of the wheel retraction. The path of the circular motion of the circle, as it were, copies the profile of the part from the side of the movement of the circle, removing a metal layer equal to the maximum, for a given force parameter, feed to the plunge. As the circle approaches the top of the part and decreases the angle of inclination of the profile of the part, the signal of sensor 1 becomes less than the signal of setpoint 2 ,. which leads to the appearance of a full signal at the output of the adder 3, and a decrease in the output signal of the regulator 8, to a decrease in the speed of the circle retraction to zero. When the signal reaches the zero mark, the actuator 9 stops. A logic signal 1 appears at the output of the retraction speed sensor 10, the fourth input of block 6 arrives at the output of the one-shot 19 and the second output of block 6 briefly appears the logical signal O. This causes the memory element 18 to reset and the appearance at the first output of the control unit 6 of the logical signal O and on the output of the logic elements. The copes I-NE 23 and 24 of the appearance of the logical signal 1, which is repeated at the output of the memory element 20 and at the output of the start block 7. Key 5 and the second channel

the switch 4 is opened, the first channel of the commutator 4 is closed, connecting the regulator 13 of the longitudinal feed speed to the adder 3. The longitudinal feed speed increases and when the circle leaves the contact with the part, it reaches its maximum. On a subsequent pass, the grinding system works in a similar way. In this way, a metal layer is removed on the concrete part, equal to the maximum for a given level of the power parameter of the cutting process, the feed for plunging.

The application of the proposed device allows to increase the productivity of 1Schofovany by stabilizing the feed to prezapio. at the maximum technological level.

Formula is invented and

1. The adaptive guidance system of the grinding machine, comprising a start-up unit, a power sensor for the cutting process, and a power parameter level adjuster connected to a sequence of activated RMS, wheel retraction speed and longitudinal feed speed controllers, respectively, connected to wheel retraction and feed drives, that, in order to improve performance, the system is equipped with a two-input switch, a key, a maximum longitudinal feed speed setting device, a control unit; and, speed sensors the longitudinal feed and control of the speed of the circle, the output of the adder is connected to the inputs of the two-threshold switch, the control unit and one of the key inputs, the output of which is connected to the input of the speed regulator of the circle, and the control of the input to the output of the control unit the inputs of the two-threshold switch and the start-up unit are connected, 5 or less of the output of the two-threshold commutator is connected to the input of the feed rate regulator, and the output of the start-up unit and the output of the minimum control unit are connected to the two other inputs of the switch awns supply which is connected to one of .The inputs of the control unit, the other two inputs of which are connected respectively to the sensors controlling the retraction speed and feed rate range, vho127 rows which are respectively connected to the outputs of regulators circle retraction speed and feed rate. 2. The system according to claim 1, characterized in that the control unit is provided with a null organ, a comparator, a single vibrator and an AND logic element connected in series and a memory element with two inputs, with an element of 10 3-6 cops And connected to one input with a nullorgan, and the second to a comparator, and the second input of the memory element is connected to the output of a one-shot, which is one of the outputs of the control unit, the second output of which is the output of the memory element, and the inputs of the control unit is input zero -organ, two in and comparator and monostable input.

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Claims (2)

Claim 1. The adaptive control system of the grinding machine, comprising a start block, a sensor for the power parameter of the cutting process and a level switch for the power parameter connected to a serially connected adder, speed controllers of the circle retraction and longitudinal feed connected respectively to the drives of the circle retraction and feed, characterized in that , in order to increase productivity, the system is equipped with a two-input switch, a key, a setpoint for maximum longitudinal feed speed, a control unit, speed sensors an open feed and control of the speed of the discharge of the circle, while the output of the adder is connected to the inputs of the two-threshold switch, the control unit and to one of the inputs of the key, the output of which is connected to the input of the speed controller of the withdrawal circuit, ha, and the control input to the output of the control unit, to which the inputs of the two-threshold switch and the start block are connected, and the output of the two-threshold switch is connected to the input of the feedrate speed controller, and the output of the start block and the output of the minimum speed controller are connected to the other two inputs of the switch odachi which is connected to one input of the control unit, the other two inputs of which are connected sootvetst- · venno to sensors monitoring wheel retraction speed and feed rate vho5 rows which are respectively connected to the outputs of the regulators circle retraction speed and feed rate. 2. The system according to claim 1, characterized in that the control unit is equipped with a null-element, a comparator, a single-vibrator and a logical element And connected in series with a memory element with two inputs, and the element And is connected to one input with a zero organ, and the second - with a comparator, and the second input of the memory element is connected to the output of a single-shot, which 5 is one of the outputs of the control unit, the second output of which is the output of the memory element, and the inputs of the control unit is the input of the zero-organ, two inputs com Arathor and 10 monostable input. Fig 2 Inputs FIG. 5 I-