JP2002028714A - Wire drawing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten inspection time, also to contrive the effective use of space in a works and to perform exact inspection by enabling in-line detection of the internal defect of a wire. SOLUTION: A straightening machine 20 for straightening the wire 12 pulled out of a supply reel 16 is arranged on the downstream side of the reel 16 which is loaded with a wire coil 14. Two die units 32, 32 each provided with a die are arranged separately in series in the feeding direction of the wire on the downstream side of the straightening machine 20. A through type eddy current flaw detector 40 for detecting the surface defect of the wire 12 is arranged on the downstream side of the die unit 32 on the downstream side. An ultrasonic flaw detector 46 for detecting the internal defect of the wire 12 is arranged on the downstream side of the eddy current flaw detector 40. A guide 68 for guiding and holding the wire 12 the presence or absence of the internal defect of which is inspected with the ultrasonic flaw detector 46 is arranged on the downstream side of the ultrasonic flaw detector 46.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire drawing apparatus, and more particularly, to a wire drawing apparatus provided with an ultrasonic flaw detector for detecting an internal defect of a wire drawn by a die.

[0002]

2. Description of the Related Art A drawing apparatus for drawing a wire with a die includes a supply reel in which the wire is wound with a required diameter,
A die is disposed between the processed wire and a winding drum that winds the processed wire into a coil shape. Then, the wire drawn from the wire coil wound on the supply reel and inserted through the die is forcibly wound into a coil shape by the winding drum, whereby the wire is drawn by the die. It has become.

[0003] The wire drawn by the wire drawing device includes:
In the course of the wire drawing operation, besides generating surface defects such as scratches on the surface, cavities and cracks may be generated inside. Products with these surface defects and invisible internal defects,
When shipped to an external user as it is, deterioration in structural strength and quality deterioration due to the defect often occur. Therefore, prior to shipment of the product, the wire is inspected in advance for the presence of surface defects or internal defects, and the repairable external flaws found are removed by grinding with a grinder,
Scratching is carried out by melting or removing by scarfing.

[0004]

However, the inspection of the surface defect and the internal defect of the wire is performed by using an inspection device in which the processed wire coil wound in a coil shape on the winding drum is installed at another place. The inspection is performed by passing a wire drawn from a wire coil through various flaw detectors and the like included in the inspection apparatus. That is, it is necessary to perform a complicated operation in which the wire once wound in a coil shape is drawn out to pass through the flaw detection device and wound again in a coil shape, and it takes time to perform the inspection. In addition, it is pointed out that the installation of the inspection apparatus on a separate line from the wire drawing apparatus requires a space for installing the inspection apparatus in the factory.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks inherent in the prior art, and has been proposed in order to suitably solve the drawbacks. Accordingly, it is an object of the present invention to provide a wire drawing apparatus which can shorten the inspection time, effectively use the space in the factory, and can perform an accurate inspection.

[0006]

SUMMARY OF THE INVENTION In order to overcome the above problems and achieve the intended object, a wire drawing apparatus according to the present invention comprises a die through which a wire drawn from a wire coil is inserted, A winding device that is disposed downstream of the wire feeding direction and that includes a winding unit that forcibly winds the wire in a coil shape, wherein a wire is formed between the die and the winding unit by the die. An ultrasonic flaw detector for detecting an internal defect of the obtained wire is disposed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of a wire drawing apparatus according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram showing a wire drawing device according to an embodiment. The wire drawing device 10 includes a wire drawing line for drawing a wire drawn from a right-handed wire coil, A wire drawing line for wire-drawing a wire drawn from a left-handed wire coil is provided in parallel, and since the configuration of both lines is substantially the same, it mainly corresponds to a right-handed wire coil. The mechanical configuration of the wire drawing line will be described.

A supply reel 16 as a supply source loaded with a wire coil 14 in which a wire 12 is wound with a required diameter.
Is rotatably disposed on the supply truck 18, and a straightening machine 20 for correcting the wire 12 drawn from the supply reel 16 is disposed downstream of the supply truck 18 in the wire feed direction. . On the downstream side of the straightening machine 20, a wire drawing machine 22 and a winding drum 2 as winding means are provided.
A take-up truck 26 in which 4 is rotatably arranged is arranged in series. By rotating the winding drum 24 by a motor (not shown), the wire 12 continuously drawn from the supply reel 16 and continuously passed through the straightening machine 20 and the wire drawing machine 22 is transferred to the drum 24. It is configured to be forcibly wound into a coil.

As shown in FIG. 3, the wire drawing machine 22 arranges, on a common base 28, each device constituting each drawing line corresponding to both winding directions (right-handed or left-handed) of the wire coil 14. In the downstream side of each straightening machine 20,
Two dice units 32, 32 with dice 30
However, they are arranged in series at a distance from each other in the wire feeding direction.
That is, the wire 12 drawn from the supply reel 16 and straightened by the straightening machine 20 continuously passes through the two die units 32, 32, so that the wire diameter is reduced to a required diameter. I have.

As shown in FIG. 4, each of the die units 32 has a through hole 36a formed along a pass line PL of the wire 12 in a support 36 rotatably supported by a die box 34 forming a main body thereof. Have been. A die accommodating portion 36b is formed at an upstream portion of the through hole 36a in the feeding direction, and the inner peripheral surface of the accommodating portion 36b has a taper approaching the pass line PL from the upstream side to the downstream side. Is formed. The dice 30 having a bush 38 composed of a plurality of segments each having a taper corresponding to the taper formed on the outer peripheral surface is housed in the die housing part 36b. That is, the wire rod 12 is
0, the force applied to the die 30 to move it downstream in the feeding direction acts on the die 30 in the direction of reducing the diameter of the bush 38 toward the pass line PL by the double taper, and thereby accurate positioning of the die 30 (Centering) is performed so that the axis of the wire 12 can be held in alignment with the pass line PL.

As shown in FIG. 2, a piercing type eddy current flaw detecting device for detecting a surface defect such as a flaw or a crack existing on the surface of the drawn wire rod 12 is provided on the downstream side of the die unit 32 on the downstream side. The device 40 is arranged. In the eddy current flaw detection device 40, an exciting coil and a detection coil (both not shown) set to an inner diameter that allows the wire 12 to pass therethrough are arranged separately in the wire feed direction, and the wire 12 passes through both coils. Sometimes, an eddy current is generated on the surface of the wire 12 by a magnetic field generated through the excitation coil, and an induced current is generated in the detection coil by the eddy current. If the wire 12 has a surface defect, the eddy current changes in accordance with the depth and size thereof, and the defect is detected by outputting a flaw detection signal using an induced current that fluctuates in response to the change. It is configured to do.

As shown in FIG. 3, the eddy current flaw detector 40 is provided on the base 28 so as to be separated from the wire feeding direction and extend in a direction perpendicular to the feeding direction. It is slidably mounted on the guide rails 42, 42,
The eddy current flaw detection device 40 is configured to be moved along the guide rails 42, 42 by a hydraulic cylinder 44 disposed between the guide rails 42, 42. That is, the eddy current flaw detector 40 of the embodiment is a
4 and a position allowing the passage of the wire 12 in alignment with the pass line PL corresponding to the wire drawing line of FIG.
4 is moved and positioned by the forward / reverse biasing of the hydraulic cylinder 44 between a position which is aligned with the pass line PL corresponding to the wire drawing line of No. 4 and allows the passage of the wire 12. .

On the downstream side of the eddy current flaw detector 40, an ultrasonic flaw detector 46 for detecting an internal defect such as a nest or a crack existing inside the drawn wire 12 is arranged in series. As shown in FIG. 2, the ultrasonic flaw detector 40 includes a flaw detection tank 48 for storing a predetermined amount of a flaw detection liquid such as oil as a transmission medium, and a plurality of ultrasonic probes 50 disposed in the flaw detection tank 48. And an entrance auxiliary tank 52 disposed on the entrance side of the wire rod 12 in the flaw detection tank 48 and an exit auxiliary tank 54 disposed on the exit side. The flaw detection tank 4
8 are formed in the inlet-side drawing wall 56 and the outlet-side drawing wall 58 through holes 56a and 5
8a are provided with their central axes aligned. Also, a through-hole 60a and a through-hole 62a that allow the passage of the wire 12 are formed on the entry-side outer wall 60 that defines the entry-side auxiliary tank 52 and the exit-side outer wall 62 that defines the exit-side auxiliary tank 54. The through holes 56a and 58a are provided in alignment with the central axis. Then, the wire 12, which has been inspected for surface defects by the eddy current flaw detector 40, is placed in the through hole 60.
It is configured to be fed horizontally in the flaw detection tank 48 via a, 56a, 58a, and 62a.

In the flaw detection tank 48, the flaw detection liquid is stored such that the level of the flaw detection liquid is always above the level of the through holes 56a and 58a. , So that it is completely immersed in the test solution. Each ultrasonic probe 50 functioning to transmit and receive ultrasonic waves is located in the flaw detection tank 48 and
2 at the same position as the passing level. Then, ultrasonic waves are transmitted from each ultrasonic probe 50 toward the wire 12 fed in a horizontal state in the flaw detection tank 48, and reflected waves reflected from internal defects of the wire 12 and returning in the incident direction. The probe 5
0, which is converted into an electric signal, amplified, and imaged on a cathode ray tube (CRT) or the like to detect an internal defect.

The ultrasonic flaw detector 46, like the eddy current flaw detector 40, is configured so that one flaw is detected by each drawing line corresponding to the winding direction of the wire coil 14. That is, as shown in FIG. 3, a pair of guide rails 64, 6 disposed on the base 28 so as to be separated from each other in the wire feeding direction and extend in a direction perpendicular to the feeding direction.
The ultrasonic flaw detector 46 is slidably mounted on the guide rail 4 and the two guide rails 64, 6.
The hydraulic cylinder 66 is arranged to move along the guide rails 64, 64 by a hydraulic cylinder 66 disposed between the guide rails 64.
Then, by urging the hydraulic cylinder 66 in the forward and reverse directions, the ultrasonic flaw detector 46 allows the right-handed wire rod 14
And a position where the wire 12 is allowed to pass in line with the pass line PL corresponding to the wire drawing line
The wire 12 is moved and positioned in alignment with the pass line PL corresponding to the wire drawing line.

On the downstream side of the ultrasonic flaw detector 46, a guide device 68 for guiding and holding the wire 12 inspected for the presence or absence of an internal defect by the ultrasonic flaw detector 46 is provided on a pass line PL in each drawing line. The base 28 in an aligned state
Are located in As shown in FIG. 5, the guide device 68 includes a plurality (two in the embodiment) of first guide rolls 70 separated from each other in the wire feeding direction below the pass line PL. 70 is pivotally supported by a first support mechanism (not shown) so as to be freely rotatable. Further, the first support mechanism is provided with a servomotor 7 disposed on the main body 72 of the guide device 68.
4, the first guide rolls 70 move toward and away from the pass line PL via the first support mechanism by rotating the motor 74 forward and backward.
Each first guide roll 70 has a V supporting the lower surface of the wire 12.
The roll is configured to be adjusted when the wire diameter of the wire 12 changes due to an order change or the like, so that the axis of the wire 12 can always be supported at a position coinciding with the pass line PL.

As shown in FIG. 5, the guide device 68 is provided above each of the first guide rolls 70 above the pass line PL.
And a plurality of second guide rolls 76 facing each other, and the second guide rolls 76 are rotatably supported by a second support mechanism (not shown) so as to be freely rotatable. The second support mechanism is provided with the main body 7.
Hydraulic cylinder 78 as a hydraulic cylinder arranged in 2
When the hydraulic cylinder 78 is urged in the normal and reverse directions, the second guide rolls 76, 76 are moved toward and away from the pass line PL via the second support mechanism. Each of the second guide rolls 76 is a convex roll that supports the upper surface side of the wire 12. The second guide roll 76 is brought close to the pass line PL, and the wire 12 is moved to the first guide roll 70.
By holding the wire 12 at a predetermined pressure, the axis of the wire 12 can always be held at a position coinciding with the pass line PL while suppressing the occurrence of blurring in the wire 12.

[0019]

Next, the operation of the wire drawing apparatus according to the above-described embodiment will be described for the case where the right-handed wire coil 14 is used. That is, the eddy current flaw detector 40 and the ultrasonic flaw detector 46 are respectively positioned at positions aligned with the right-handed pass line PL by urging the hydraulic cylinders 44 and 66 in a predetermined direction (the state shown in FIG. 3). ). Then, the wire rod 12 drawn from the supply reel 16 loaded with the right-handed wire rod coil 14 is attached to the two die units 32 and 3.
2. It is set on the winding drum 24 while being inserted through the eddy current flaw detector 40, the ultrasonic flaw detector 46, and the guide device 68. Also, the first guide roll 70 of the guide device 68 is
The second guide roll 76 is moved by the servo motor 74 to a position corresponding to the wire diameter of the wire 12 and is held at a predetermined pressure between the first guide roll 70 and the second guide roll 76.
Is moved by the urging of the hydraulic cylinder 78.

In this state, by forcibly rotating the winding drum 24, the wire 12 drawn from the supply reel 16 is inserted into the two dies 30, 30, and
Wire drawing to the required wire diameter. Then, the wire rod 12 after the wire drawing is passed through the eddy current flaw detector 40,
The presence / absence of the surface defect is inspected, and then the presence / absence of the internal defect is inspected by passing through the ultrasonic flaw detector 46. After the inspection of the surface defects and the internal defects is completed, the wire 12 is guided downstream while being held by the upper and lower guide rolls 70 and 76 in the guide device 68, and then is coiled around the winding drum 24. It is wound up.

That is, in the wire drawing apparatus 10 of the embodiment, the eddy current flaw detector 40 and the ultrasonic flaw detector 46 for inspecting surface defects and internal defects of the wire 12 are provided in-line. It is not necessary to inspect the wire coil at another place, and the inspection time can be shortened.
Also, there is no need to install inspection equipment on a separate line,
The space in the factory can be effectively used.

When the eddy current flaw detector 40 and the ultrasonic flaw detector 46 are arranged in series as in the embodiment, the distance from the dice unit 32 to the winding drum 24 becomes longer, and the wire 12 passing through the dice unit 32 becomes longer. May cause blurring. However, in the wire drawing apparatus 10 according to the embodiment, the guide device 68 is disposed downstream of the ultrasonic flaw detector 46, and the wire 12 is fed while the axis thereof is held at a position coinciding with the pass line PL. Because it was configured to
It is possible to prevent the wire 12 from being blurred when passing through the flaw detectors 40 and 46, and to accurately inspect the surface defect and the internal defect. Dice unit 32
In the above, since the positioning of the die 30 is performed accurately by the force applied to the die 30 when the wire 12 passes through the die 30, the centering of the wire 12 on the upstream side of the eddy current flaw detection device 40 is also ensured. This also contributes to suppression of blurring of the wire 12.

In the above-described embodiment, the case where the ultrasonic flaw detector is arranged downstream of the eddy current flaw detector has been described. However, the configuration may be reversed. Further, the wire drawing apparatus can be adapted to only one of left-handed and right-handed winding of the wire coil, or can adopt a configuration in which one or three or more die units are provided. Furthermore, the eddy current flaw detector and the ultrasonic flaw detector are not limited to the specific configuration shown in the embodiment, and various types may be appropriately employed. The number of the first and second guide rolls provided in the guide device is not limited to two, but may be three or more.

[0024]

As described above, according to the wire drawing apparatus according to the present invention, since the ultrasonic flaw detector for detecting the internal defect of the wire is provided in-line, the wire coil after being wound by the winding means is provided. Does not need to be inspected at another location, which can reduce the inspection time. Further, since there is no need to install an inspection device on a separate line, the space in the factory can be effectively used.

Further, since the guide device is configured to prevent the wire rod from being blurred, it is possible to accurately inspect the internal defect by the ultrasonic flaw detector. Furthermore, by arranging the eddy current flaw detector for detecting the surface defect of the wire in series with the ultrasonic flaw detector, the surface and internal defects of the wire can be continuously inspected in-line, which further reduces the time required for the inspection. Can be shortened.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a wire drawing apparatus according to a preferred embodiment of the present invention.

FIG. 2 is a schematic side view showing the wire drawing machine according to the embodiment, partially cut away.

FIG. 3 is a schematic plan view showing the wire drawing machine according to the embodiment, partially cut away.

FIG. 4 is a schematic side view showing a dice unit according to the embodiment, partially cut away.

FIG. 5 is a schematic side view showing the guide device according to the embodiment, partially cut away;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Wire rod 14 Wire coil 24 Winding drum (winding means) 30 Dice 40 Eddy current flaw detector 46 Ultrasonic flaw detector 68 Guide device 70 First guide roll 74 Servo motor 76 Second guide roll 78 Hydraulic cylinder (fluid pressure cylinder)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2G047 AA06 AB03 AD18 BC08 BC09 EA09 EA13 GA20 GH04 2G053 AA11 AB21 BA14 BC14 CA03 DB05 4E096 EA01 EA11 FA01 GA03 GA15 GA27 HA29

Claims (3)

[Claims] 1. A wire rod (12) drawn from a wire coil (14).
And a winding means (24) that is disposed downstream of the die (30) in the wire feeding direction and forcibly winds the wire (12) into a coil shape. In the wire drawing apparatus, the die (3) is provided between the die (30) and the winding means (24).
A wire drawing apparatus characterized by disposing an ultrasonic flaw detector (46) for detecting an internal defect of a wire (12) drawn by the method (0). 2. A plurality of first guide rolls (70) movable toward and away from a pass line (PL) of the wire (12), and the first guide roll (70) is attached to the wire (12). Servo motor (74) that moves close to or away from the pass line (PL) according to the wire diameter
A plurality of second guide rolls (76) that face the first guide roll (70) with the pass line (PL) of the wire rod (12) interposed therebetween and are movable toward and away from the pass line (PL). And a fluid pressure cylinder (76) that moves the second guide roll (76) toward and away from the pass line (PL) to hold the wire (12) at a predetermined pressure between the first guide roll (70). (78)
The wire drawing apparatus according to claim 1, wherein 8) is disposed between the ultrasonic flaw detector (46) and the winding means (24). 3. An eddy current flaw detector (40) for detecting a surface defect of a wire rod (12) drawn by the die (30) between the die (30) and a guide device (68). Ultrasonic flaw detector
The wire drawing device according to claim 2, wherein (46) and the wire drawing device are arranged in series.