JPH11179426A - Wire rod temperature measuring device and wire drawing machine using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire rod temperature measuring device capable of measuring the temperature of a wire rod to be drawn with excellent precision in spite of its vibration and a drawing machine capable of heating the wire rod to be drawn at a suitable temperature by measuring the temperature of the wire rod to be drawn with excellent precision. SOLUTION: The wire rod temperature measuring device is provided with a radiation thermometer 11 which measures the temperature of the wire rod to be drawn and has a diameter D1 of a measuring visual field circle equal to or less than a diameter D2 of the wire rod W to be drawn, a rocking mechanism 12 which rocks the radiation thermometer 11 at larger amplitude S1 than amplitude S2 at the time of the wire to be drawn vibrating, and a circuit which peak-hold processes a signal measured by the radiation thermometer with which the temperature of the wire rod to be drawn is measured. Also, the temperature of the wire rod to be drawn is measured with the wire drawing machine by the use of the temperature measuring device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature measuring device for measuring the temperature of a wire to be processed in a wire drawing machine and a wire drawing machine using the temperature measuring device.

[0002]

2. Description of the Related Art A wire drawing machine for drawing a wire made of metal is a method in which a wire to be processed unwound from an uncoiler is heated in a furnace and then pulled through a die and wound up by a recoiler. The wire can be continuously drawn by moving the wire. In this wire drawing machine, it is important to control the temperature of the furnace that heats the wire to be processed in order to perform good wire drawing. For this reason, the wire passing through the furnace is heated by the furnace and immediately before entering the die. The temperature is measured, and control is performed based on the temperature information so as to obtain a furnace temperature suitable for the material of the wire to be processed.

Conventionally, a radiation thermometer has been used for measuring the temperature of a wire to be processed in a wire drawing machine. This radiation thermometer converts radiation from a wire to be processed into an electric signal and measures the temperature. However, when measuring the temperature of the wire to be processed with this radiation thermometer, if the measurement visual field circle (spot) of the radiation thermometer is larger than the diameter of the wire to be processed, the material temperature is averaged over the visual field circle and the temperature is accurately measured. There is a problem that it is not possible to measure a proper temperature. Therefore, it is advantageous in terms of responsiveness and accuracy to measure the temperature of the wire to be processed by using a radiation thermometer having a measurement field circle smaller than the diameter of the wire to be processed.

[0004] However, the wire to be processed during the wire drawing is subtly vibrated by the vibration of a driving unit for rotating and driving the recoiler or the vibration during the die processing. Therefore, as shown in FIG. 6, the wire W to be processed may deviate from the measurement field circle C of the radiation thermometer due to vibration, and in this case, the radiation thermometer cannot measure the temperature of the wire to be processed. As a result, a portion where the temperature cannot be measured occurs in the wire to be processed, and it becomes difficult to measure the temperature of the wire to be processed stably and continuously. In addition, due to the vibration of the wire to be processed, a situation occurs in which the wire passes through the field circle of the radiation thermometer instantaneously without standing still. When the wire to be processed instantaneously passes through the measurement visual field circle, the radiation thermometer cannot measure the center temperature (maximum temperature) of the wire to be processed and leave it as information. When these situations occur, as shown in FIG. 7, the measurement signal obtained by measuring the temperature of the wire to be processed by the radiation thermometer has a sawtooth signal waveform, and the temperature measurement result is obtained by averaging the temperature measurement results. Is lower than the actual temperature.

[0005]

As described above, in the conventional wire temperature measuring device, it is difficult to accurately measure the temperature of the wire to be processed due to the vibration of the wire to be processed, and the measurement result is not sufficient. There is a problem that the temperature is lower than the actual temperature of the processed wire. For this reason, based on the measurement result obtained by measuring the temperature of the wire to be processed using the conventional temperature measuring device, the temperature of the heating furnace is controlled, that is, the supply of energy (such as gas) to the heating furnace is controlled. In addition, the temperature of the heating furnace is controlled to a value higher than the actual temperature of the wire to be processed, and the wire to be processed is heated to an overheated temperature, and is heated at an appropriate temperature suitable for the material of the wire to be processed. Can not do.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a wire temperature measuring device capable of accurately measuring the temperature of a wire to be processed irrespective of its vibration. Another object of the present invention is to provide a wire drawing machine capable of accurately measuring the temperature of a wire to be processed and heating the wire to be processed at an appropriate temperature.

[0007]

According to a first aspect of the present invention, there is provided a temperature measuring apparatus for a wire rod, wherein a diameter of a circle of a measurement visual field is equal to or smaller than a diameter of a wire rod to be continuously moved. A radiation thermometer for measuring the temperature of the wire to be processed and a swing mechanism for swinging the radiation thermometer with an amplitude larger than the amplitude at which the wire to be processed vibrates are provided.

According to the structure of the present invention, the oscillating mechanism swings the radiation thermometer with an amplitude larger than the amplitude of the wire to be processed, so that the measuring field circle of the radiation thermometer is reliably captured across the wire to be processed. it can. Since the measurement field circle of the radiation thermometer is equal to or less than the diameter of the wire to be processed, the center temperature (maximum temperature) of the wire to be processed can be sampled when the wire crosses the wire to be processed.

According to a second aspect of the present invention, there is provided a temperature measuring device for a wire rod.
A radiation thermometer in which the diameter of the measurement field circle is equal to or smaller than the diameter of the wire to be processed which is continuously moved, and measures the temperature of the wire to be processed; and And a circuit for performing a peak hold process on a measurement signal obtained by measuring the temperature of the wire to be processed by the radiation thermometer. Features.

According to the structure of the present invention, the maximum temperature of each part of the continuously moving wire to be processed is sequentially and accurately determined by sampling the signal every oscillation cycle of the radiation thermometer and subjecting the signal to peak hold processing by the circuit. Can be measured.

According to a third aspect of the present invention, there is provided an uncoiler for feeding a wire to be processed, a recoiler for pulling and winding the wire drawn from the uncoiler, and a rewinder for feeding and winding the wire from the uncoiler. A heating furnace for heating through the wire to be taken, a die for processing to a predetermined diameter through the wire to be heated in the heating furnace, and measuring a temperature of the wire before entering the die. 1. A wire temperature measuring device according to claim 1.

A wire drawing machine according to a fourth aspect of the present invention is an uncoiler for feeding a wire to be processed, a recoiler for winding the wire to be processed drawn from the uncoiler, and a winding for winding on the recoiler being fed from the uncoiler. A heating furnace for heating through the wire to be taken, a die for processing to a predetermined diameter through the wire to be heated in the heating furnace, and measuring a temperature of the wire before entering the die. 2. A wire temperature measuring device according to item 2.

According to the wire drawing machine of the third and fourth aspects of the present invention, the temperature of the wire to be processed is accurately measured by using the wire temperature measuring device, and the wire to be processed is appropriately determined based on the measurement result. It can be heated at any temperature.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. A wire drawing machine equipped with a temperature measuring device will be described with reference to FIG. In FIG. 1, reference numeral 1 denotes an uncoiler on which a wire W to be processed is placed, 2 denotes a recoiler which is rotated by a rotary drive device (not shown) and pulls and winds the wire W to be processed and unreeled from the uncoiler 1; Reference numeral 5 denotes a heating furnace for heating the wire W to be processed, and reference numeral 6 denotes a die for processing the wire W into a predetermined diameter through the heated wire W. As the heating furnace 5, for example, a gas furnace for burning gas is used. In this gas furnace, gas is supplied from a gas supply source (not shown) and the gas supply amount is controlled by a control valve 7 shown in FIGS. It has become.

Then, the wire W to be processed placed on the uncoiler 1 is fed out and passes through the presser body 3 and the lubricant applying body 4. Next, the wire W to be processed passes through the heating furnace 5 and is heated to a predetermined temperature. Further, the wire W to be processed is drawn through the die 7 and wound up on the recoiler 2 rotated by the rotary driving device. Then, the wire W to be processed is continuously drawn out from the uncoiler 1, moved, and continuously wound up on the recoiler 2, whereby the wire W to be processed is continuously drawn to a predetermined diameter. In this embodiment, the diameter of the wire W to be processed is, for example, about 1 mm to 2 mm.

A radiation thermometer 11 for measuring the temperature of the wire W to be processed before entering the die 6 and the radiation thermometer are provided on the side of the wire movement path between the heating furnace 5 and the die 6. An oscillating mechanism 12 for oscillating 11 is provided.

The radiation thermometer 11 and the swing mechanism 12 will be described with reference to FIG. As the radiation thermometer 11, for example, a fiber type infrared radiation thermometer is adopted. This fiber type infrared radiation thermometer radiates infrared rays to the wire W to be processed, receives radiation from the wire W to be processed, converts the radiation into an electric signal, and measures the temperature. The reason why the fiber infrared thermometer 11 is adopted as the radiation thermometer 11 is that it is non-contact type, so it has no influence on the quality of the wire to be processed, has a small visual circle diameter, has relatively good responsiveness, and is small. This is because there are advantages such as easy handling and easy device implementation. The radiation thermometer 11 is shown in FIGS.
And a head portion 11a which emits infrared rays and receives radiation from the wire rod W to be processed, as shown in FIG.
a circuit section 11b for processing the electric signal from a to obtain the temperature
have. The diameter of the measurement field circle in the head portion 11a is equal to or smaller than the diameter of the wire W to be processed.

The head 11a of the radiation thermometer 11 has an infrared radiation port, which is covered with a sensor cover having a compressed air supply port. This is in consideration of the environment in which the radiation thermometer 11 is provided, and the dust is prevented from adhering to the radiation thermometer 11 and heat radiation is performed by constantly feeding air. It is advantageous to arrange the radiation thermometer 11 so that the focus is in the vicinity of the die 6, and it is desirable to measure the temperature as close as possible to the die 6 in terms of grasping the drawing conditions.

The swing mechanism 12 has the following configuration. A swing lever 23 is supported on the column 21 by a horizontal pivot 22 so as to be vertically swingable.
The head 11 a of the radiation thermometer 11 is attached to the upper surface of the thermometer 3, and the head 11 a swings about the pivot 22 by the swing of the swing lever 23. An electric motor 24 with a speed reducer is installed in parallel with the pivot 22.
5 is attached. Reference numeral 26 denotes a connecting rod. One end of the connecting rod 26 is pivotally connected to the swing lever 23 by a pin 27, and the other end is connected to the disk 25 by a pin 28. Thus, the swing lever 23 and the disk 25 are connected by the connecting rod 26, and the rotation of the disk 25 causes the swing lever 23 to swing through the connecting rod 26. The length of the connecting rod 26 can be adjusted, and the disk connecting position of the connecting rod 26 can be adjusted along the radial direction of the disk 25. Thus, the swing amplitude (swing angle) of the swing lever 23 can be adjusted. In addition, connecting rod 2
As the means for adjusting the length and the means for adjusting the position along the radial direction of the disk in FIG.

The oscillating lever 23 swings the radiation thermometer 1
The one head portion 11a can swing up and down around the pivot 22 integrally. That is, the disk 2
The swing lever 23 oscillates one reciprocating motion while 5 rotates once. Thereby, the temperature measurement focus (measurement field circle D1) of the radiation thermometer 11 can swing. Radiation thermometer 11
The amplitude of the swing of the head portion 11a is set to be larger than the amplitude of the vibration of the wire W to be wire-drawn.

The oscillating mechanism 12 is arranged such that the temperature measuring focal point (measurement field circle) of the head portion 11a of the radiation thermometer 11 moves vertically above and below the moving path of the wire rod W to be processed. Set up to vibrate.

FIG. 3 shows the measurement field circle and the amplitude of the radiation thermometer 11. That is, the diameter D1 of the measurement field circle C of the radiation thermometer 11 is the same size as the diameter D2 of the wire W to be processed,
Or smaller. Measurement field circle C of radiation thermometer 11
The amplitude S1 of the (head portion) is larger than the amplitude S2 of the wire W to be processed. In this embodiment, for example, when the diameter of the wire W to be processed is 1 mm, the visual circle diameter D of the radiation thermometer 11 is set.
1 is set to 1 mm. The vibration S1 of the visual field circle is set to about 3 mm when the wire W to be processed vibrates about 1 mm near the die 6.

The operation of the radiation thermometer 11 and the swing mechanism 12 will be described. The radiation thermometer 11 is a wire W to be processed before being heated by the heating furnace 5 in the wire drawing machine and entering the die 6.
, An infrared ray is emitted, the radiation from the wire W to be processed is received, converted into an electric signal, and the temperature is measured.

During the wire drawing, the winding force acts on the wire W to be processed as tension, and the wire W is stretched between the recoiler 2 and the die 6 and between the die 6 and the presser body 3. Become. However, the wire W to be processed vibrates between the die 6 and the presser body 3 due to the vibration during processing or the action of the flame from the gas furnace.

The head 11a of the swing mechanism 12 is
4 causes the swing lever 23 to vibrate once in the vertical direction each time the disk 25 is rotated once, and the radiation thermometer 11 also
Vibrates twice. As a result, the focal point of the radiation thermometer 11 swings from the upper side to the lower side with respect to (the moving path of) the workpiece W (the moving path thereof), and the focal point of the radiation thermometer 2 from the lower side to the upper side. The radiation thermometer 12 measures the temperature of the wire W to be processed during the second traversing.

The oscillating mechanism 12 controls the radiation thermometer 1
By swinging the workpiece 1 at an amplitude S1 larger than the amplitude S2 of the wire W to be processed, the measurement field circle of the radiation thermometer 11 can be reliably captured across the wire W even if the wire W is vibrating. . Furthermore, since the diameter D1 of the measurement visual field circle of the radiation thermometer 11 is equal to or less than the diameter D2 of the wire W to be processed, when the measurement visual field circle crosses the wire W to be processed, the central temperature of the wire W to be processed (maximum) Temperature). In this way, the radiation thermometer 11 swings up and down, and intermittently measures the temperature of the part of the continuously moved wire W before entering the die 6.

Further, the maximum temperature measurement signal (analog signal) of each part of the wire W to be processed measured by the radiation thermometer 11 is subjected to peak hold processing by an electric circuit. FIG. 4 shows a circuit for performing peak hold processing on a measurement signal. In FIG. 4, 31 is a peak holder, which is a radiation thermometer 11.
The measurement signal is received from the circuit section 11a. 3
Reference numeral 2 denotes an upper limit alarm setting device, which outputs an upper limit alarm signal when the measurement signal output from the circuit section 11a is equal to or higher than a set temperature. A timer 33 receives a signal from the upper limit alarm setting device 32 and outputs a signal to the peak holder 31. A control circuit 34 controls the temperature of the heating furnace 5 by controlling the amount of gas supplied to the heating furnace 5 in the wire drawing machine. This is a control valve provided in a supply pipe for supplying gas to the heating furnace 5. 7 is controlled. In this embodiment, the temperature at which the upper limit alarm setting device outputs the upper limit alarm signal is set to, for example, 550 ° C.

The operation of this circuit will be described with reference to FIG. FIG. 5A shows a head 11 a of the radiation thermometer 11.
FIG. 5 (b) is a diagram showing the relationship between the measurement signal output from the circuit section 11a of the radiation thermometer 11 and time, and FIG. 5 (c) is the upper limit. Alarm setting device 32
Diagram showing the relationship between the signal output from the device and time, FIG.
FIG. 5D is a diagram illustrating the relationship between the signal output from the timer 33 and time, and FIG. 5E is a diagram illustrating the relationship between the peak value signal and time.

Then, as shown in FIG. 5 (a), the temperature is measured each time the head 11a of the radiation thermometer 11 swings along the vertical direction 7 and crosses the moving path of the wire W to be processed.
As shown in (b), a measurement signal having a chevron shape is output from the circuit section 11a to the peak holder 31 and the upper limit alarm setting device 32. In FIG. 5B, it is assumed that the temperature of each part of the wire W to be processed is at least 400 ° C. or more.
Is displayed as the basic temperature. Here, the circuit unit 11a
When the temperature of the measurement signal output from the controller is equal to or higher than the set temperature (for example, 550 ° C.), the upper limit alarm setting device 32 outputs an upper limit alarm signal to the timer 33 as shown in FIG. As shown in FIG. 5D, the timer 34 receives the upper limit alarm signal and outputs the one-shot signal to the peak holder 31 as a hold signal. As shown in FIG. 5E, the peak holder 31 performs a peak holding process to obtain a peak signal, that is, a maximum temperature of each portion of the wire W to be processed.

In this way, every time the head 11a of the radiation thermometer 11 swings and crosses the moving path of the wire W to be processed, the peak value of each portion of the wire W to be processed is sequentially obtained. The obtained peak value signal is not the continuous temperature of the wire W to be processed, but is the temperature of the wire to be processed intermittently measured at a certain interval. If the temperature measurement interval is small, the wire to be processed is a continuous body. It can be said that there is no significant difference from the temperature itself. Therefore, the obtained data is not a sawtooth data obtained by fixing the head portion as shown in FIG. 6, but a relatively smooth step-like signal and a value substantially equal to the actual temperature is obtained. be able to. By measuring the temperature of the wire W to be processed as described above, the temperature of the wire to be processed heated in the furnace can be accurately measured regardless of the vibration.

Then, the peak holder 31 outputs a peak signal to a control circuit 34 for controlling the temperature of the heating furnace 5 in the wire drawing machine. The control circuit 34 operates based on the peak signal from the peak holder 31 to obtain the temperature of the heating furnace 5 corresponding to the material of the wire W to be processed, and to open the control valve 7 so as to obtain the gas supply amount to the heating furnace 5. Control. Thus, the heating furnace 5
In this case, the temperature of the heating furnace 5 corresponding to the material of the wire W to be processed can be obtained. Therefore, the maximum temperature of the wire W to be processed, which is heated by the heating furnace 5 and moved to the die 6 in the wire drawing machine, is accurately measured irrespective of the vibration, and the temperature of the heating furnace 5 is determined based on the measured temperature result. Good wire drawing can be performed by controlling to an appropriate value corresponding to the material of the wire W to be processed. The present invention is not limited to the above-described embodiment, but can be implemented with various modifications.

[0032]

As described above, according to the wire temperature measuring apparatus of the present invention, the temperature of the moved wire to be processed can be measured accurately regardless of its vibration. Further, according to the wire drawing machine of the present invention, it is possible to accurately measure the temperature of the wire to be processed, heat the wire to be processed at an appropriate temperature, and perform good wire drawing.

[Brief description of the drawings]

FIG. 1 is a view showing a wire drawing machine according to an embodiment of the present invention.

FIG. 2 is a diagram showing a wire temperature measuring device provided in the wire drawing machine in the embodiment.

FIG. 3 is a diagram showing a temperature measuring operation in the wire rod temperature measuring device of the embodiment.

FIG. 4 is a diagram showing a peak hold processing circuit in the wire temperature measuring apparatus according to the embodiment;

FIG. 5 is a diagram showing an operation in the wire temperature measuring device of the embodiment.

FIG. 6 is a diagram showing an operation of a wire rod temperature measuring device according to a conventional mode.

FIG. 7 is a diagram showing signals obtained by the wire temperature measuring device of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Uncoiler, 2 ... Recoiler, 3 ... Workpiece wire presser body, 4 ... Lubricant application body, 5 ... Heating furnace, 6 ... Dies, 7 ... Control valve, 11 ... Radiation thermometer, 12 ... Swing mechanism, 23 ... Swing lever 24 ... Electric motor 31 ... Peak holder 32 ... Upper limit alarm setting device 33 ... Timer 34 ... Control circuit

Claims (4)

[Claims] 1. A radiation thermometer for measuring the temperature of a wire to be processed, wherein a diameter of a circle of a measurement visual field is equal to or smaller than a diameter of a wire to be processed continuously moved, and the radiation thermometer. A swing mechanism for swinging the wire with an amplitude larger than the amplitude at which the wire to be processed vibrates. 2. A radiation thermometer for measuring the temperature of the wire to be processed, wherein the diameter of the circle of measurement visual field is equal to or smaller than the diameter of the wire to be processed continuously, and the radiation thermometer. A swing mechanism for swinging the wire to be processed with an amplitude larger than the amplitude when the wire is vibrated, and a circuit for performing peak hold processing on a measurement signal obtained by the radiation thermometer measuring the temperature of the wire to be processed. A wire rod temperature measuring device comprising: 3. An uncoiler for feeding a wire to be processed, a recoiler for pulling and winding the wire drawn from the uncoiler, and heating through the wire to be fed from the uncoiler and wound on the recoiler. A heating furnace, a die for processing to a predetermined diameter through the wire to be processed heated by the heating furnace, and the wire temperature measuring device according to claim 1, which measures the temperature of the wire to be processed before entering the die. A wire drawing machine comprising: 4. An uncoiler for feeding a wire to be processed, a recoiler for pulling and winding the wire to be processed fed from the uncoiler, and heating the wire to be fed from the uncoiler and wound on the recoiler. A heating furnace, a die for processing to a predetermined diameter through the wire to be processed heated by the heating furnace, and a wire temperature measuring apparatus according to claim 2, which measures the temperature of the wire to be processed before entering the die. A wire drawing machine comprising: