SU383998A1 - METHOD OF ADJUSTMENT OF THE LEVEL OF THE PRELIMINARY ADJUSTMENT OF THE DEVICE TEAM OF ACTIVE CONTROL - Google Patents

Description

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The invention is relative to the field of abrasive machining of parts using active control devices.

A known method of adjusting the preset command level of the active part dimensions control command, in which two additional adjustment levels that cannot be changed during processing, sets the monitored amount of the change in the size of the workpiece — the change in the sensor signal and depending on the time-signal transition one level of adjustment to another serves a different signal to the executive relay, the bias level of operation in one or another th side.

The proposed method differs from the known one in that the moment of issuing the command of the active control device is corrected directly. Proportionally to the values of the change in the part size for a predetermined interval epeMeifH.

FIG. 1 shows a device with which the proposed method can be implemented; in fig. 2 is a block diagram of this device.

The pneumatic device 1 of the active control is connected via a pipeline 2 to the measuring bellows 3 of the reference command device. The carriage 4 and is connected with the bellows 5 and 5 and mounted on flat springs 6, forming a spring parallelogram. The carriage with the lead 7

leads in the rotation sector 8, transmitting motion to the arrow 9, which moves relative to the scale. Movable contacts 10 and // are fixed on the carriage, when closing or opening them with fixed adjustable contacts 12 and 13, control commands are issued by the processing cycle. The contact 12 is fixed in the part 14, which hangs on the spring parallelogram 15 and with its support 16 contacts to

the surface of the fist 17, which is formed in the form of an Archimedean spiral. By turning the knuckle 17, the position of the contact 12 is adjusted and, accordingly, the moment of issuing the command is adjusted.

On one axis with an arrow, sector 18 is fixed from the opening i. On one side of the sector there is an illuminator 19 with a vanilla lamp; on the other hand, a photodiode 20 is fixed. With the gear drive, the cam 17 enters

Gearing gear 21, fixed on the shaft of the reversing shpovogo engine. The rotation of the knuckle is limited by the MP 22 microswitch. 2 shows the SI pulse counter,

converter P and time relay Pb. The correction is carried out as follows. In the machining process, as the size of the part changes, the arrow 9 moves relative to the scale. A sector 18, fixed on the same axis as the arrow, moves between the illuminator 19 and the photodiode 20. The SI pulse counter outputs signals when light passes from the illuminator through the sector holes to the photodiode. When approaching the preset level selected at the setting, one of the contacts of the device K1 is triggered (not shown in the drawing), the converter is turned on and the time relay (Pb) is started. The converter enhances the crib shaft that is accessed from the pulse counter and, converting them into supply voltage, feeds it to a reversible stepping motor (RShD). Each pulse received after operating contact K1 corresponds to the rotation of the engine shaft and, accordingly, gear 21 and fist 17 at a certain angle. The rotation of the cam continues until the time relay commands the end of the correction. The time relay is set for a constant period of time, which is set when adjusting the system and remains unchanged during the processing of the product lot. As a result of the correction carried out, the position of the fist 17 and, accordingly, the contact 12, which determines the command trigger level, will be set in accordance with the number of pulses recorded by the pulse counter for the time from the instant of trip W until the relay trips. The number of pulses recorded at the same constant time interval depends on the rate of change of size during processing, which is determined by the actual value of the feed. Thus, with a higher feed (at a higher rate of change of size). The command response level will be produced by a large amount, with a smaller flow - by a smaller value. The correction is made at the same time as the pulse count. After the termination of the processing, the system returns to its original position before the microswitch operates. Subject of the Invention details for the determination, a predetermined period of time.

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