JP2757129B2 - Die diameter measuring method and die diameter measuring device for continuous wire drawing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring a die diameter of a die in a continuous wire drawing machine.

[0002]

2. Description of the Related Art A continuous wire drawing machine is provided with a die for drawing a wire, and a winding drum for winding the drawn wire. Each winding drum is provided with a motor for rotationally driving.

[0003] When the wire is wound on the winding drum, a drawing force is given to the wire, and the cross-sectional area is reduced and the length increases each time the wire passes through the die. Therefore it will be faster. Therefore, the respective winding drums are driven at different rotational speeds according to the drawing speed of the wire.

By the way, the dies wear as the wire is drawn out, the diameter of the dies changes, and the drawing speed fluctuates. As a result, the wire cannot be drawn to a predetermined outer diameter.

Therefore, the die diameter has been measured to determine when to replace the die. The conventional method for measuring the die diameter is as follows:
The speed ratio of the motor of each winding drum has been calculated and found.
In addition, the die diameter mentioned here is a hole diameter of the die.

[0006]

However, in the conventional measuring method, an error occurs between the speed of the motor and the speed of pulling out the wire rod due to slippage occurring in the speed reduction mechanism between the motor and the winding drum. Accuracy deteriorated and a high-precision signal converter was required. Further, in order to solve such a problem, it is necessary to use a motor having a feedback function provided with a rotation detector, and there is a problem that the cost is increased.

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a method and an apparatus for measuring a die diameter with high accuracy and at low cost.

[0008]

As shown in FIG. 1, there is provided a die 1 for drawing a wire W, a winding drum 2 having the same diameter for winding the drawn wire W, and a winding drum. A set of motors 6 for rotating and driving the drums 2 is provided. A continuous wire drawing machine is provided in plural sets, and a detector 10 for detecting the number of rotations of each winding drum 2 and a drawing die 1 of the final set are used. A measuring device 11 for measuring the outer diameter of the drawn wire W and an arbitrary set of the winding drum 2 rotate.
And a calculator 12 for calculating an arbitrary set of die diameters from the length of the wire W drawn out based on the detection values from the detector 10 and the measuring device 11 during the operation.

Then, the winding drum 2 in an arbitrary set is
Compare this to the length of the winding wire W which has passed through the drum 2, the length of the wire W which has passed through the reference and name Ru take-up drum 2 in the meantime during the rotation by the predetermined rotation number Ln, the length Is obtained from the reference die diameter based on the ratio of the die. That is, since the length of the wire W that has passed corresponds to the number of revolutions of the winding drum 2, each winding drum 2 has the same diameter, and the length of the wire W that has passed through the winding drum 2 is determined by the winding drum W Dn = √
And requests the die diameter than the formula of _{(L E / Ln) × d} E.

However, the die diameter to be obtained is dn, the die diameter of the final set is d _E , the rotation speed of any winding drum 2 is Ln,
The rotation speed of the winding drum 2 of the last set is assumed to be _LE .

[0011]

In the above-mentioned means for solving the problems, as the die 1 wears and the diameter of the die changes as the wire is continuously drawn for a long time, the rotation of the winding drum 2 is detected by the detector 10 during operation. Is detected by Further, since the die diameter cannot be directly measured, the outer diameter of the wire W finished by the final set of dies 1 is detected by the measuring device 11 and is regarded as the die diameter of the final set of dies 1.

Then, Ln is determined so that an arbitrary winding drum 2 has a predetermined number of rotations, and the number of rotations of the last set of winding drums 2 during the predetermined number of rotations of the winding drum 2 is determined. To detect. These detection results are expressed as dn = √ (L _E / L
are substituted into equation n) × d _E, and calculates the die diameter d _n in the desired die 1.

As described above, the die diameter of each set of the dies 1 is obtained, and the degree of wear is examined. At this time, the detection error is a length corresponding to one rotation of the winding drum 2 at the maximum, so that the measurement error can be made small and the die diameter can be measured with high accuracy.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 2, a continuous wire drawing machine according to this embodiment has a die 1 for drawing a wire W, a winding drum 2 for winding the wire W, and a rotatable upper part of the winding drum 2. the drawing head 4 and a supported feed arm 3 as one set, which necessary number die drawing head 4A～4 _E is plural sets continuously provided, the take-up drum in KakuShinsen head 4 2 are the same in diameter and are operated in synchronization with each other.
Then, a drawing force is given by winding the film with the winding drum 2, the drawing is performed by the next adjacent die 1, and the above operation is repeated in order to finish to a predetermined outer diameter.

The take-up drum 2 is a cylinder rotatably supported on the upper surface of a base via a drive shaft 5, and the outer diameter decreases toward the top. The drive shaft 5 is connected to a motor 6, each of the winding drums 2 is driven at a rotation speed set in accordance with the die diameter, and each of the motors 6 is controlled so that the stored dose is constant.

The feeding arm 3 is rotatably supported on the upper surface of the winding drum 2 via a support shaft 7, and a roller is rotatably mounted at the end thereof. A guide roller 8 is provided above the winding drum 2 for guiding the wire W fed from the feeding arm 3 to the next wire drawing head 4.
Is disposed between the guide roller 8 and the die 1.
A guide roller 9 for guiding the roller to the die 1 is provided.

The dies 1 are arranged on the upstream side of the winding drums 2 in the wire rod traveling direction, and are fixed at a height facing the lower end of the wire storage portion of the winding drum 2. The die diameter determined according to the drawing conditions is used.

The continuous wire drawing machine is provided with a die diameter measuring device for managing the wear of the die 1, and a detector 10 for detecting the number of rotations of each winding drum 2 as shown in FIG. When the meter 11 for measuring the outer diameter of the withdrawal the processed wire W by the die 1 of final drawing head 4 _E
When, an operational unit 12 for calculating a die diameter of any drawing head 4A～4 _E based on the detected value from the detector 10 and the measuring device 11.

The detector 10 is composed of a proximity switch, is arranged opposite to each winding drum 2, and is turned on when the detected piece 13 of the winding drum 2 approaches. Also, the measuring instrument 11 consists dimension sensor, for example, an electric micrometer, a linear image sensor or the like is used, is disposed on the downstream side of the wire traveling direction than the winding drum 2 of the final drawing head 4 _E The outer diameter of the passing wire W is measured. The computing unit 12 uses a microcomputer or a sequencer, is connected to each detector and measuring instrument, and has a display device for displaying the calculation result, an operation panel for inputting operating conditions, and the like.

In the above configuration, the operating conditions are set by inputting a die diameter, a wire processing speed, and the like.
a~4 take-up drum 2 at a rotation speed corresponding to the respective die diameter while tuning in _E is operated. The wire W supplied from the wire feeder is guided to the first die 1 and drawn. The wire W wound on the winding drum 2 is fed by the feeding arm 3, and is guided to the next die 1 via the upper guide roller 8 and the guide roller 9. Then, the wire W through the above path, are successively drawn and finished in retrieved by final drawing head 4 _E.

[0021] During this operation, the KakuShinsen head 4A～4 _E, and the rotational speed calculator 12 is detected by the detector 10 each time the take-up drum 2 rotates 1 outputs one signal I have. The finished wire W is measured by the measuring device 1
1 measures the outer diameter. Incidentally, the outer diameter corresponds to the die diameter of die 1 of final drawing head 4 _E.

Then, while continuing to drive for a long time,
The dice 1 are worn and the dice diameter changes. In such a case, the wire cannot be drawn as specified, resulting in poor quality. Therefore, the calculator 12 calculates the die diameter based on the data input from the detector 10 and the measuring device 11 and manages the wear of the die 1.

The method of measuring the die diameter will be described. The amount of rotation of the last set of winding drums 2 while the winding drum 1 of an arbitrary wire drawing head 4n rotates, that is, the length of the wire W that has passed, is described. The die diameter is determined by comparison. Here, the die diameter of an arbitrary wire drawing head 4n is dn.
(Mm), the die diameter (wire diameter) detected by the measuring device 11 is d _E (mm), and the number of revolutions of the winding drum 2 of an arbitrary drawing head 4n is Ln, and the final drawing is performed while Ln is counted. When the rotational speed of the head 4 _E of the winding drum 2, L _E, the wire passing per predetermined time is constant, the following equation holds.

Π (dn / 2) ² × Ln = π (d _E / 2) ² × L _E (1) From this, dn = √ (L _E / Ln) × d _E (2) is derived.

Thus, in order to determine the die diameter of an arbitrary wire drawing head 4n, when the winding drum 2 of the arbitrary wire drawing head 4n rotates by a predetermined number of revolutions Ln, the final set of the winding drum 2 advance decide Ln so that the rotational speed is, for example, 5000 rpm, the take-up drum 2 detects the final set of the winding rotational speed L _E of the drum 2 between the Ln rotation. Further, the wire diameter of the wire W corresponding to the final die diameter is also measured, and these values are substituted into the equation (2) to calculate a desired die diameter in the wire drawing head 4n. This calculation result is displayed on a display device or printed out.

[0026] Then, a die diameter of KakuShinsen head 4A～4 _E, it is determined whether the die diameter exceeds the reference tolerance, examine the degree of wear. If the wear is severe, the operation is stopped and the die 1 is replaced.

Here, when the detection of the number of rotations of an arbitrary winding drum 2 is started, and when the last winding drum 2 is in a state as shown in FIG. 1, one rotation is not counted. . For example, assuming that the circumference of the winding drum 2 is 1 m, there is a possibility that an error of 1 m at maximum for one rotation occurs in the length of the wire W. L _E is 5000 rpm (5000
m), the error Err (%) is: Err = ｒ (1/5000) × 100 = 1.41%. Actually, since the die diameter does not change rapidly, for example, if 5000 m is changed to 10,000 m, Err = 1.0
%become. As described above, by comparing the length, the error of the calculated die diameter can be made very small, and the reliability of the measurement result can be increased.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that many modifications and changes can be made to the above-described embodiment within the scope of the present invention. The die diameter measuring method and the measuring device of the present invention may be applied to a continuous wire drawing machine provided with a dancer roller upstream of the winding drum in the wire rod advancing direction in order to keep the storage amount of the winding drum constant. .

The rotation speed of the winding drum may be detected by a rotary encoder, an optical sensor or the like. Also,
By increasing the frequency of detection of the number of revolutions of the winding drum to two pulses instead of one pulse per rotation, the error can be further reduced to √ (1/2) = 0.707 times when the error is one pulse. The higher the frequency, the higher the accuracy of detecting the die diameter.

Instead of using the final drawing head as a reference for measurement, it is also possible to measure the die diameter of each die by measuring the wire diameter of a wire rod based on an arbitrary drawing head. it can.

[0031]

As is apparent from the above description, according to the present invention, in order to obtain the die diameter, the windings in an arbitrary set are determined.
Up drum is compared to the length of the wire passed through the take-up drum during the rotation, and the length of wire which has passed through the reference and ing winding drum during this time. The ratio of its length by calculating the rotational speed of the winding drum, so seeking die diameter than the formula _{dn = √ (L E / Ln} ) × d E, determined from the speed ratio of the motor as in the prior art Compared to the case, the measurement can be performed without being affected by the slip between the motor and the winding drum, and the accuracy can be improved. Therefore, even if a motor having no feedback function is used, measurement accuracy is not affected, and the cost of the entire continuous wire drawing machine can be reduced. Further, since the length of the drawn wire material corresponds to the number of rotations of the winding drum, a maximum error of the winding drum 1
Although an error occurs by the length corresponding to the rotation, the error of the calculated die diameter can be reduced as the length to be compared becomes longer, and the reliability of the measurement result can be increased.

The die diameter measuring device includes a detector for detecting the number of revolutions of each winding drum, a measuring device for measuring the outer diameter of a wire rod drawn by a set of dies as a reference, and an arbitrary set of A simple structure such as a calculator for calculating an arbitrary set of die diameters from the length of the drawn wire rod based on the detection values from the detector and the measuring device during the rotation of the winding drum can be provided. Since the detector and the measuring device are usually used, if an existing device is used, it is not necessary to newly provide the detector and the measuring device, and the cost can be further reduced. Therefore, the die abrasion can be managed with high accuracy and at low cost.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a die diameter measuring device in a continuous wire drawing machine of the present invention.

FIG. 2 is a diagram showing a part of a continuous wire drawing machine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Dice 2 Winding drum 4a-4 _E wire drawing head 10 Detector 11 Measuring device 12 Computing unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01B 21/14 G01B 7/12

Claims (3)

(57) [Claims] 1. A continuous wire drawing machine in which a plurality of dies for drawing a wire, a winding drum of the same diameter for winding the drawn wire, and a motor for rotating and driving the winding drum constitute one set. In, take-up in any set
Compared to the length of the wire passed through the take-up drum while the ram is rotated, a length of wire which has passed through the winding drum criteria and ing the meantime, as a reference based on the ratio of its length A method for measuring the diameter of a die, comprising determining the diameter of a die in an arbitrary set from the diameter of the die. The length of 2. A winding wire was passed through the drum member is detected based on the rotation speed of the winding drum, a die diameter of obtaining dn, the final set of die diameter d _E, any of the winding drum the rotational speed Ln, when the rotational speed of the final set of the winding drum and _{L E, dn = √ (L} E / Ln) method of measuring the die diameter according to claim 1, characterized in that a × d _E. 3. A continuous drawing machine in which a plurality of dies for drawing a wire, a winding drum having the same diameter for winding the drawn wire, and a motor for rotating and driving the winding drum are provided as one set. In, a detector for detecting the number of rotations of each winding drum, and a measuring device for measuring the outer diameter of the wire drawn by a set of dies as a reference ,
And a calculator for calculating an arbitrary set of die diameters from the length of the drawn wire rod based on the detection values from the detector and the measuring device during the rotation of the winding drum of the set. Die diameter measuring device.