SU591826A1 - Lapping tool release actuator control device - Google Patents

Description

(54) DEVICE FOR CONTROLLING THE DRIVE OF THE LAMP

G 1 The device belongs to the field of automation and is intended for use in metal-cutting / machine tools during finishing operations. A device for control is known. the uncoupling actuator, l, containing a cutting force sensor, a threshold element, coincidence circuits, a software time relay, and a proximity switch. The disadvantages of the known devices are the unreliability and low accuracy of operation. Closest to the invention by technical essence is a drive control device uncoupling a lap 2, containing a cutting force torque sensor, connected to a threshold element, a time relay, a switch of the lap up speed and a switching block. This device also does not differ in high accuracy, since the parts arriving at the finishing after previous operations (grinding, electric spark or hardening) parts, as a rule, have local defects in the hole surface (modified layers, gar) or its edges (burrs). In the presence of such defects at the moment of insertion of the lap into the part, a temporary lock-in of the lap-in occurs, the head spindle is rotated and starts the time relay through a proximity switch. The finishing time countdown begins, although the lap has not yet touched the walls of the part. The result of this is a defect in the size of the parts, and a significant part of the parts is returned for revision, which increases the complexity of the process and actually reduces the productivity of the machine. The premature switching on of the time relay also occurs when a lap-in is inserted into the part with a skew with respect to the hole in the part. The aim of the invention is to improve the accuracy of the device. This goal is achieved by introducing an AND element, an inverter, a key element and a delay unit into the proposed device. The input of the delay unit is connected to the output of the threshold element, the first input of the And element and through the key element to the input of the switching unit, and the output to the second input of the And element and through an inverter with a control input of the key element. The output of the element I is connected to a time relay and a switching unit for the opening speed of the lap.

The drawing shows a block diagram of the proposed device for controlling the opening press drive.

The device contains a sensor 1 of the moment of cutting forces, a threshold element 2, a delay unit 3, an element 4, a time relay 5, an inverter 6 ,. the key element 7, the block of the boiler 8 and the block 9 of switching of the unclamp speed of the lap.

The device works as follows.

When the finishing head is lowered, the engine opens the break-in lap. When this occurs, the accelerated unclamping priter. If the surface of the finished hole has no local defects and at the time of insertion there was no misalignment of the lap around the part, then the accelerated unclamping continues until the moment when the lap of the SteFiOK touches the part. At the moment of contact with the output of sensor 1, the signal to threshold element 2 begins to flow. When the moment of friction reaches a specified value between the lapping and the part, the output of the threshold element 2 enters the input of delay unit 3, the input of element 4 and the input of key element 7. The delay unit 3 has no signal; an inverting signal is fed through the inverter 6 to the control input of the key element 7, and the switching unit 8 is turned on. The unclamp motor is de-energized. The uncoupling is stopped for a while until: the delay unit 3 is activated.

The delay time is set within 1.5-3 seconds. After a specified time, a signal appears at the output of the delay unit 3, which closes the key element 7 through the inverter 6 and the signal disappears at the input of the switching unit 8. The motor is powered by an unclamping motor.

The signal from the output of the delay unit 3 is also fed to the input of the element 4, the second input of which is powered by the threshold element 2. The signal from the output of the element 4 starts. Time relay 5 starts the duty cycle counting time, the simultaneous signal from the output of the 4 element 4 is fed to the input of the block 9 for switching the spreading speed of the lap from accelerated to working. There is a switching of the unclamping speed of the lap, and in the future, the work of the unclamping motor of the lap provides time relay 5.

If the lap is introduced into the part with a bias on the part or there is a local defect on the surface of the part, then the threshold element 2 is triggered by the signal from sensor 1.

The delay unit 3 has no signal, the key element 7 is open and when the switching unit 8 is closed, the uncoupling engine stops. The set delay time is sufficient to eliminate the local defect of the hole or part being brought, self-adjusting by lap. The signal level from the output of the sensor 1 pA, the signal disappears at the output of the threshold element 2, the switching unit 8 is turned off and the unlocked motor starts. But switching of the opening speed of the lap from the accelerated to the working one and switching on of the time relay 5 does not occur, since the output of the AND 4 element does not match the signals from the delay unit 3 and the threshold element 2. Therefore, the output of the AND 4 element also lacks a signal. it

0 means that the accelerated uncoupling of the lap continues until it touches the part wall to the lap. From the moment you touch, the device works as described.

5 The proposed device for controlling the drive of an uncoupling priter on the walls for the adjustment of the holes eliminates the false activation of a programmed time relay, i.e. premature

the transition to the duty cycle mode, and thus significantly reduces the percentage of parts returned for revision.

35

Claims (2)

1. USSR author's certificate number 300303, M. class. B 24 B 33/02, 1971. 2. Miller. Launching the spray gun guide hole on machines CNIT. Proceedings of CNITA, M., 1974, no. 62, p. 39, FIG. one.. Zh-nzh