SU812496A1 - Apparatus for dimensional electrochemical working - Google Patents

Description

(54) DEVICE FOR DIMENSIONAL ELECTROCHEMICAL

PROCESSING

one

The invention relates to electrophysical and electrochemical processing methods and, in particular, relates to a device for the dimensional electrochemical treatment of thin-walled metal parts such as rotation bodies.

Devices for dimensional electrochemical machining with a sectional electrode tool are known, each section of which is connected to a technological current source through an active control system with part thickness measurement sensors. Part thickness control is performed

sensors located in the area of the interelectrode gap 1.

However, the known method of active control is not accurate enough and reliable, as the sensor readings during operation are influenced by electrolyte and process current.

The purpose of the invention is to increase the accuracy of machining parts such as rotation bodies and increase the reliability of the device.

This goal is achieved by the fact that the sensors measure the thickness of the workpiece are located on the side of the part opposite to the tool electrode with a jaw of 180 °, and a device for controlling the source of process current is introduced into the active control system.

FIG. 1 schematically shows the proposed device; in fig. 2 is a section A-A in FIG. one; in fig. 3 - functional scheme of the device.

The device includes a tank 1, a drive 2 for rotating the part, a sectional electrode tool 3. The tank 1 is a tank for an electrolyte into which the sectional power tool and a part of the workpiece are immersed. The actuator 2 has a horizontal shaft 4, which serves to hold and rotate the part. A collector 5 is mounted on the shaft 4 for transferring the process current from the DC source to the part.

Claims (1)

The sectional electrode tool 3 consists of a series of sections (3f, 3, ..., Za) isolated from each other, located in the direction from the axis of rotation of the part to its periphery, each of which is supplied with a process current and electrolyte from processing the pump. The active control system consists of sensors 6 (6f, bg, .-, ba), measuring the thickness of the part, control unit 7, delay device 8, actuator 9 and direct current source 10. The sensors 6 for measuring the thickness of the part are located on the side of the part opposite to the tool electrode 3 with a step of 180 °, each sensor measuring only that part surface that is processed by one of the sections of the tool electrode 3 with which it is associated respectively. The control unit 7 serves to compare information received from sensors 6 about the actual thickness of the part with the one programmed in it, and issue the appropriate command to the actuator 9 through the device 8 to delay the supply or stop the supply of technological current to the corresponding section of the tool-electrode 3. Device 8 the delay serves to delay the signal from control unit 7 to the actuator 9 for that period of time until the part in which the thickness is measured by sensor 6 is opposite the section ele trodes Tool respectively associated with this sensor. The delay time is equal to the rotation of the part around its axis at an angle of 180. The delay device is made in the form of a drum 11 mounted on a shaft 4 with a rubber band 12 on which a magnetic tape 13 is pasted, and three recording heads 14-16. The recording heads 14 and 15 are located around the drum 11 in 180 ° increments, and the recording head 16 is located between them in 90 ° increments. The recording head 14 is used to record on the magnetic tape 13 a signal from the control unit 7 for the actuator 9 to stop or resume the supply of technological current to the section of the electrode tool 3. The recording head 15 serves to read the recorded signal, and the recording head 16 to erase the recorded signal. The actuator 9 serves to stop or resume the supply of current to the sections and can be represented, for example, as a contactor. A constant current source is used to supply process current to the electrodes and to power the active control system. The device works as follows. A detail like a rotating body is fixed on the shaft 4, and the required electrode gap is established between its surface and the tool electrode. On the side of the part opposite to the tool electrode 3, in 180 ° increments, sensors 6 are installed to measure the actual thickness of the part directly during processing. The control unit 7 is assigned a program for providing the required thickness of the part against each section of the electrode tool 3. The drive for rotating the part 2 is turned on, the pump for supplying electrolyte to the sections 6 is turned on, and a constant current source 10 is turned on. Under the action of the technological current, an electrochemical dissolution of the surface of the part occurs, while the sensors 6 continuously monitor the thickness of the part and transmit information about the actual value of the thickness of the part in one way or another. section in control unit 7. The control unit 7 continuously compares the obtained thicknesses from each sensor with the programmed one and issues an appropriate command to the actuator 9 to stop or resume the supply of technological current to the tool section of the tool electrode 3. In this case, the command to the actuator 9 is supplied from the control unit 7 via the delay device 8, for which the signal from block 7 is recorded by the recording head 14 on the magnetic tape 13, then after turning the drum AND at an angle of 180 °, the signal is read Recordable head 15, after which the recording head 16 erases it in the subsequent rotation of the drum 1 at 90 °. The signal of the recording head 15 enters the control unit 7, usi-. It is cast there and guided to the actuator 9 with a time delay equal to the rotation of the part through 180 °. The control unit 7 commands the actuator 9 until the entire surface of the part reaches a predetermined thickness. The proposed device allows, by eliminating the effect of electrolyte and technological current on sensors 6, to improve the accuracy of machining parts such as rotation bodies and the reliability of the device as a whole. The invention The device for dimensional electrochemical machining with sectional electric tools, each section of which, through an active control system with sensors measuring the thickness of the workpiece, is connected to a process current source, characterized in that, in order to improve the accuracy of machining parts such as rotation bodies, and increase reliability of operation devices, sensors measuring the thickness of the workpiece are located on the side opposite to the electrode tool with a step of 180 °, and in the actuation system In direct control, a delay control device for the technological current source is introduced. Sources of information taken into account during the examination 1. USSR author's certificate No. 246998, cl. C 25 D 5/34, 1968. FIG. one R