SU977504A1 - Device for controlling degree of heating of moving wire before drawing - Google Patents

Description

(54) DEVICE FOR REGULATING HEATING DEGREE OF MOVING WIRES BEFORE DEVELOPMENT

one

The invention is intended for use in installations for the heating of moving wire with electric current.

A device for controlling an induction heating process is known, comprising a controlled source of electrical energy, a voltage sensor and a multi-channel switch. In the device, the process of induction heating of the wire is controlled by changing the voltage on the inductor according to a given program. one).

The use of this device for controlling the heating of the moving wire before drawing does not ensure the maintenance of the optimal power parameters of the drawing process, since it does not take into account changes in the physical characteristics of the material being heated (impurity composition, initial temperature, etc.) according to a predetermined program.

Closest to the proposed technical entity is a device for controlling the degree of annealing of a wire, containing a control object and an adjustable source of electric power connected to it, a voltage sensor and a speed sensor, the output of which is connected to a generator. In the known device, the voltage at the heating section is adjusted depending on the wire rewinding speed and, comparing the onset force of plastic deformation of the annealed wire to the specified, periodically corrects the heating voltage to achieve a stabilization of the degree of annealing of the wire when the impurity material changes. the temperature of the wire entering the heating zone 2.

The application of the known device in wire heating installations prior to drawing requires the selection of such parameters of its heating, while maintaining them, the minimum value of the dragging force is reached, which will reduce energy-intensive costs during the dragging process. The known device does not provide for the selection and maintenance of optimal heating parameters for the Pro2Q die due to the absence of special search schemes in it.

The purpose of the invention is to ensure the minimum energy and power costs for the process of drawing. This goal is achieved in that a device for controlling the degree of heating of the wire containing the control object and an adjustable source of electric power connected to it, a voltage sensor and a speed sensor, the output of which is connected to a generator, are connected in series by a drag force sensor and a voltage converter whose output through the switch is connected to one of the inputs of the code comparison circuit, the other input of which is connected to the switch output via a delay unit, and the output is connected to one from the inputs of the combinational circuit, one of the outputs of which is connected to one of the inputs of the AND circuit, and through a delay element to another input of the combinational circuit, the other output of which is connected to one of the inputs of the reversible counter, the output of which is connected to one of the inputs through the code to voltage converter a limiting circuit, one of the outputs of which is connected to another input of the AND circuit, the output of which is connected to another input of the reversible counter, another output of the limiting circuit is connected to one of the inputs of the voltage regulator, another input to torogo connected to the output of the sensor voltage, and an output connected to the input of an adjustable source of electricity, the generator output is connected to the control input of the switch, the output speed sensor is also connected to another input limiting circuit and the input of drawing force sensor zan.s communication control entity. The drawing shows a block diagram of the proposed device. The device contains a control object 1 (heated portion of a moving wire) and an adjustable electric power source 2 connected to it, connected to a voltage regulator 3, one of the inputs of which is connected to the output 4 of the limitation, one of the inputs of which is connected through a voltage-to-voltage converter 5 with the output of the reversible counter 6, one. from the inputs of which is connected to the output of combinational circuit 7, the other output of which is connected to one of the inputs of the circuit AND 8 and through the delay element 9 (D-flip-flop) to one of its inputs. The other input of the combinational circuit 7 is connected to the output of the code comparison circuit 10, one of the inputs of which is connected through the switch 11 and the voltage-to-voltage converter 12 to the output of the drag force sensor 13, the input of which is connected to the control object 1. The device also contains a delay unit 14, the input of which is connected to the output of switch 11, and the output is connected to another input of the code comparison circuit 10, and a voltage sensor 15 connected to the control object 1, the output of which is connected to another input of voltage regulator 3, and a speed sensor 16 also connected to the control object 1, the output of which is connected to the generator 17, the output of which is connected to the control input of the switch 11. The output of the speed sensor 16 is also connected to another input of the restriction circuit 4, the other output of which the other input of the AND circuit 8, which output is connected to another input of down counter 6. The apparatus operates as follows. A signal from the output of the speed sensor 16, proportional to the speed of movement of the wire arriving at the input of the generator 17, determines the frequency of the sync (clock) pulses of the latter, determines the frequency of searching for the optimum heating voltage of the moving wire. At the same time, the speed sensor 16 detects the maximum value of the driver signal, which determines the threshold of the limiting circuit 4. The signal from the output of the sensor 13 is drawn to the input of the voltage converter 12 to the code from which the binary code of the signal Fj through the switch 11 with a frequency dependent on the speed of the wire, is fed to one of the inputs of the code comparison circuit 10, where it is compared code Fj- ,, received from the output of the voltage converter 12 to the code one clock earlier. Scheme 10 code comparison implements the function X: | l, npHFj Fj-i, lO, npHF, "Fj.p where Xj is the signal Ha of the output of the code comparison circuit; Fj HFj. -binary codes of signals at its inputs. The signal Xj from the output of the code comparison circuit is fed to one of the inputs of combinational circuit 7, which implements the function Zj-Xi-Yj, .VXi-Zi.i Zi Xi-Zi., VXi-Z, .j, where 7- | Zj - signals at the output of the combinator circuit in the i-oM cycle, 2i {0, ll. 2i 0, l, X, Y} Zj-i - signals at its inputs, l, Zi., .L} If the code of the signal of the driving effect At the output of the reversible counter 6 is less than the maximum permissible for a given speed of wire drawing, the signals Zj and Zj arrive respectively, the summing and subtracting inputs of the reversible counter 6, resulting in an increase in fZj 1, 2} 0) or a decrease (Zj О Zj 1) of the code of the signal of the driving effect. Otherwise, one of the inputs of the circuit AND 8, from the output of circuit 4, receives a signal of logical zero and no further increase in the code of the signal of the driving effect occurs.

The new code of the driver signal is fed to the input of the converter 5 of the code to the voltage, from the output of which the signal of the driver through the limiting circuit 4 is fed to one of the inputs of the voltage regulator 3, which changes the output voltage of the regulated source of electric power, to achieve equality the signals from the outputs of the voltage sensor 15 and the limiting circuit 4 to its inputs.

Consider the operation of the scheme for finding the optimal heating voltage in the case when an increase in the heating voltage has led to an increase in the drag force, i.e.

Zi.i 1; .t,

then Xj 1; YI Z -, -, l; Zi 1-OVO-l 0;

Zi 1.

The signal Zl 1 is fed to the subtracting input of the reversible counter 6, as a result of which the signal of the driving effect decreases, i.e. the device provides such a wire heating mode at which the minimum drag force is reached.

The use of the proposed device in wire heating installations before drawing will allow to ensure the optimum temperature of its heating, ensuring a minimum of the power and energy costs of drawing the wire, reducing the number of its breaks, improving the quality of the material being processed, reducing the wear of the drawing tool.

The proposed device can be effectively used when heated before drawing refractory metals and hard-to-deform alloys.

Claims (2)

1. USSR author's certificate number 761589, cl. C 21 D 11/00, 1978. 2. USSR author's certificate number 645972, cl. C 21 D 11/00, 1977.