SU931379A1 - Cutting temperature adaptive control apparatus - Google Patents

Description

I

The invention relates to automation of control of the cutting process.

Devices are known for adaptive control of the cutting process by temperature, comprising a regulating device, an actuator, a stepless drive — a main motion, an electrical circuit of a thermo-EMF drive from a natural thermocouple tool part 1.

The disadvantage of these devices is that due to the difference in thermoelectric properties of carbide plates with the same supported thermal emf of a natural thermocouple tool piece, the cutting temperature is different, which leads to a decrease in the cutting path of the tool to blunt. .

The purpose of the invention is to increase the cutting path of tools to blunt while maintaining the supported thermo-EMF value specified in the program.

The goal is achieved by the introduction of a thermo-emf correction unit into the device, the resistors of which are connected to the regulating device and the output resistor of the divider by means of switches and a relay.

FIG. 1 is a block diagram of an adaptive control device; in fig. 2 is an electrical circuit diagram of a correction unit for a single tool.

Claims (1)

The adaptive control device contains a thermocouple EMF supply circuit from a natural thermocouple instrument tooling, which includes a voltage divider, an additional Rg output resistor, a thermal emf correction unit 1, controlled by the CPU system 2, a control device 3, an actuator 4, the stepless drive of the main motion of the Correction Block 5 contains (Fig. 2) relay P, several perte P, switches P, resistors RK .; i where n is the number of instruments that can be subjected to thermoelectric correction, K 1 - (m - 1), where m is the number of switch positions, the device works as follows. The thermo-VDS of a natural thermocouple instrument-part through the additional resistor Rg of the voltage divider enters the regulating device 3 either from the output resistor Rj or from the unit 1 of the thermo-EMF correction unit. The regulating device 3 controls the actuator A, which changes the frequency of rotation of the main drive actuator 5. Before starting a tool with thermoelectric properties that are different from the properties of tools adopted as a reference, the installer on the control panel of the CNC system 2 dials the number of tool blocks containing the corresponding tools by means of dimensional correction switches. The introduction of dimensional correction is not necessary. The Oj switch is manually set by the thermo-emf correction coefficients based on the known thermoelectric properties of the instruments. At. When the tool whose number is dialed is put into operation, the coincidence circuit in the NC system works. , One of the relays is turned on, as well as the relay P, which disconnects the resistor Rg, connecting one of the resistors R ,, corresponding to the position of one of the switches P. The resistance of the output arm of the divider and its coefficient of detrusion change. The control device maintains the value of the thermo-emf of a natural thermocouple instrument-part, which is optimal for this particular combination of tool materials and part. The use of the proposed invention allows to ensure the maximum cutting path for all tools regardless of their thermoelectric properties, which leads to a reduction in the consumption of carbide cutting tools when machining parts on machines equipped with adaptive control of cutting temperature, to reduce machining errors associated with dimensional wear. cutting tools, as well as to reduce the time required for adjusting the machine tools to achieve a given machining accuracy. Claims of the Adaptive Cutting Temperature Control Device for CNC Machines Containing a Regulator, Actuator, Continuously Driving Main Motion, Thermal EMF Supply Circuit from a Natural Thermocouple Tool Part Including a Voltage Divider whose Output Resistor is Electrically Connected with a device, and an additional device with a thermocouple, characterized in that, in order to increase the cutting path of the tools to bluntness while maintaining the value specified in the program us supported thermo-electromotive force therein introduced unit korektsii thermo emf comprising resistors connected to the regulating device and the output resistor divide interm COROLLARY switches and relays. Sources of information taken into account during the examination 1. Makarov V.N., Solntsev B.A. automatic regulation of temperature cutting processes on lathes with numerical program board. - Collecting Proceedings Automatic control of cutting processes by temperature, No. k. Yaroslavl, Yaroslavl Polytechnic Institute, 1976. t R AND fi8.2 Pi D -about