JPH08122046A - Method and apparatus for measurement of die diameter in continuous wiredrawing machine - Google Patents

Abstract

PURPOSE: To measure every die diameter in a continuous wiredrawing machine with high accuracy and at a low cost. CONSTITUTION: A detector 10 which detects the number of revolutions of every take-up drum 2, a measuring instrument 11 which measures the outside diameter of a wire material W drawn by a die 1 in a last set and an arithmetic device 12 which operates a die diameter in an arbitrary set on the basis of detection values from the detector 10 and the measuring instrument 11 are installed. A die diameter to be found is designated as dn, a die diameter in a last set is designated as dE, the number of revolutions of an arbitray take-up drum 2 is designated as Ln, and the number of revolutions of a take-up drum 2 in the last set is designated as LE. Then, respective detection values are substituted in dn=√(LE/Ln)×dE, and a desired die diameter dn is computed.

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 equipped with a die for drawing a wire rod and a winding drum for winding the drawn wire rod. Each winding drum is provided with a motor for rotationally driving.

The wire rod is given a drawing force by being wound on a winding drum, and the cross-sectional area is reduced and the length is increased each time the wire passes through the die, and the drawing speed of the wire rod approaches the finish. Therefore it will be faster. Therefore, each winding drum is driven at different rotation speeds according to the drawing speed of the wire.

By the way, the die wears with the drawing of the wire, the die diameter 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 of measuring the die diameter is
The speed ratio of the motor of each winding drum was calculated and calculated.
The die diameter referred to here is the hole diameter of the die.

[0006]

However, in the conventional measuring method, a slip between the motor and the take-up drum causes a difference between the speed of the motor and the drawing speed of the wire rod due to slippage. The accuracy was poor, or a high-precision signal converter was needed. Further, in order to solve such a problem, it is necessary to use a motor having a feedback function equipped with a rotation detector, which causes a problem of cost increase.

In view of the above, it is an object of the present invention to provide a method for measuring the die diameter accurately and at low cost, and a measuring apparatus therefor.

[0008]

The problem solving means according to the present invention is, as shown in FIG. 1, a die 1 for drawing a wire W.
And a detector 10 for detecting the number of rotations of each winding drum 2 with respect to a continuous wire drawing machine in which a plurality of winding drums 2 for winding the drawn wire W form one set,
A measuring instrument 11 for measuring the outer diameter of the wire W drawn by the final set of dies 1, and a computing element 12 for computing the die diameter of an arbitrary set based on the detector 10 and the detection value from the measuring instrument 11. And are provided.

Then, the number of revolutions of each winding drum 2 is detected, and the number of revolutions of the winding drum 2 of the final set as a reference and the length of the drawn wire rod W in any set are compared with the die diameter thereof. by calculating the ratio from the rotation speed take-up drum 2, and requests die diameter than the formula _{dn = √ (L E / Ln} ) × d E.

However, the required die diameter is dn, the final set of die diameters is d _E , the rotation speed of any winding drum 2 is Ln,
Let the rotational speed of the winding drum 2 of the final set be L _E.

[0011]

In the above means for solving the problems, the die 1 wears and the diameter of the die changes while the continuous wire drawing is continued for a long time. Therefore, the rotation of the winding drum 2 during operation is detected by the detector 10. 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 this is regarded as the die diameter of the final set of dies 1.

Then, Ln is determined so that the arbitrary winding drum 2 has a predetermined rotation number, and the rotation number of the final group of the winding drums 2 during the predetermined number of rotations of the winding drum 2 is set. To detect. These detection results dn = √ (L _E / L
n) × d _E , and the die diameter d _n of the desired die 1 is calculated.

In this way, the die diameter of each pair of dies 1 is obtained, and the degree of wear is examined. At this time, the detection error has a length corresponding to one rotation of the winding drum 2 at maximum, and the error due to measurement can be made small, and the die diameter can be measured with high accuracy.

[0014]

EXAMPLE A continuous wire drawing machine of the present example, as shown in FIG. 2, 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 The drum diameters of 2 are all the same, and they are operated in synchronization with each other.
Then, the drawing force is applied by being wound on the take-up drum 2, and drawn by the next adjacent die 1. The above operation is repeated in order to finish to a predetermined outer diameter.

The winding drum 2 is a cylinder rotatably supported on the upper surface of a base via a drive shaft 5, and has an outer diameter that decreases toward the top. The drive shaft 5 is connected to a motor 6, each winding drum 2 is driven at a rotation speed set according to the die diameter, and each motor 6 is drive-controlled so that the stored dose becomes 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 attached to the tip thereof. In addition, above the winding drum 2, a guide roller 8 for guiding the wire W unwound from the unwinding arm 3 to the next wire drawing head 4.
Is provided, and the wire rod W is provided between the guide roller 8 and the die 1.
A guide roller 9 for guiding the sheet to the die 1 is provided.

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

The continuous wire drawing machine is equipped with a die diameter measuring device for controlling the wear of the die 1, and as shown in FIG. 1, a detector 10 for detecting the number of revolutions of each winding drum 2. And a measuring device 11 for measuring the outer diameter of the wire W drawn by the die 1 of the final wire 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 to face each winding drum 2, and is turned on when the detected piece 13 of the winding drum 2 approaches. The measuring device 11 is composed of a size sensor, for example, an electric micrometer, a linear image sensor, etc., and is arranged downstream of the winding drum 2 of the final wire drawing head 4 _{E in} the wire rod advancing direction. The outer diameter of the passing wire W is measured. A microcomputer, a sequencer or the like is used as the computing unit 12, each detector and measuring instrument are connected, and it has a display device for displaying a computation result, an operation panel for inputting operating conditions, and the like.

In the above configuration, the die diameter, the wire processing speed, etc. are input to set the operating conditions, and each wire drawing head 4
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 is drawn. The wire W wound on the winding drum 2 is unwound by the unwinding arm 3 and guided to the next die 1 via the upper guide roller 8 and the guide roller 9. Then, the wire W is sequentially drawn through the above path, finished by the final wire drawing head 4 _E , and taken out.

[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 There is. Also, the finished wire W is the measuring instrument 1
1, the outer diameter is measured. Incidentally, the outer diameter corresponds to the die diameter of die 1 of final drawing head 4 _E.

Then, while continuing operation for a long time,
The die 1 wears and the die diameter changes. If this happens, wire drawing cannot be performed as specified, resulting in poor quality. Therefore, the calculator 12 manages the wear of the die 1 by calculating the die diameter based on the data input from the detector 10 and the measuring instrument 11.

Explaining this method of measuring the die diameter, the amount of rotation of the final 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 rod W that has passed through is determined. The die diameter is obtained by comparison. Here, the die diameter of an arbitrary wire drawing head 4n is set to dn.
(Mm), the die diameter (wire diameter) detected by the measuring device 11 is d _E (mm), and the final wire drawing while counting the number of rotations Ln and Ln of the winding drum 2 of the wire drawing head 4n. Assuming that the number of revolutions of the winding drum 2 of the head 4 _E is L _E , the following equation holds because the wire rod passing amount per predetermined time is constant.

[0024] ^{π (dn / 2) 2 ×} Ln = π (d E / 2) 2 × L E (1) than _{this, dn = √ (L E /} Ln) × d E (2) is derived.

Thus, in order to obtain the die diameter of the arbitrary wire drawing head 4n, when the winding drum 2 of the arbitrary wire drawing head 4n is rotated by a predetermined number of revolutions Ln, the winding drum 2 of the final set is wound. Ln is determined so that the number of rotations is, for example, 5000, and the number of rotations L _E of the final set of winding drums 2 is detected while the winding drum 2 rotates Ln. 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 the die diameter of the desired wire drawing head 4n. The 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 the arbitrary winding drum 2 is started and the final winding drum 2 is in the state as shown in FIG. 1, one rotation is not counted. . For example, if the circumference of the winding drum 2 is 1 m, there is a possibility that the length of the wire W may have an error of 1 m for one rotation at the maximum. L _E rotates 5000 times (5000
m), the error Err (%) is Err = √ (1/5000) × 100 = 1.41%. Actually, since the die diameter does not change rapidly, if 5000 m is changed to 10000 m, Err = 1.0
%become. In this way, by comparing the lengths, the error in the calculated die diameter can be made very small, and the reliability of the measurement result can be improved.

The present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments 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 in which a dancer roller is provided on the upstream side of the winding drum in the wire advancing direction in order to keep the storage amount of the winding drum constant. .

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

Further, instead of using the final wire drawing head as a reference for measurement, the wire diameter of the wire rod can be measured with reference to an arbitrary wire drawing head to measure the die diameter of each die. it can.

[0031]

As is apparent from the above description, according to the present invention, the number of rotations of each winding drum is detected, and the number of rotations of the winding drum serving as a reference and the die diameter thereof are extracted in an arbitrary set. since processed by the length ratio of the wire is calculated from the rotational speed of the winding drum seeking die diameter than the formula _{dn = √ (L E / Ln} ) × d E, the speed ratio of the motor as in the prior art As compared with the case of obtaining from the above, 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, the measurement accuracy is not affected and the cost of the continuous wire drawing machine as a whole can be reduced.

The die diameter measuring device comprises 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 reference set of dies, the detector and It is possible to have a simple structure such as a calculator that calculates the die diameter of an arbitrary set based on the detected value from the measuring device.Since the detector and measuring device are usually used, if you use an existing one, It is not necessary to newly provide it, and further cost reduction can be achieved. Therefore,
It is possible to manage die wear with high accuracy and at low cost.

[Brief description of 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]

1 die 2 winding drum 4A～4 _E drawing head 10 detector 11 measuring device 12 calculator

Claims (3)

[Claims] 1. A die for drawing a wire rod and a winding drum for winding the drawn wire rod make up one set, and in a continuous wire drawing machine in which a plurality of sets are continuously arranged, the number of rotations of each winding drum is detected. , The ratio of the length of the drawn wire rod in an arbitrary set to the reference rotation speed of the winding drum and its die diameter is calculated from the rotation speed of the winding drum to obtain the die diameter. Die diameter measurement method. 2. The obtained die diameter is dn, the final set die diameter is d _E , the rotation speed of an arbitrary winding drum is Ln, and the rotation speed of the final winding drum is L _E, and dn = √ (L _E / Ln)
The method for measuring the die diameter according to claim 1, wherein xd _E is set. 3. A die for drawing a wire rod and a winding drum for winding the drawn wire rod make up one set, and in a continuous wire drawing machine in which a plurality of sets are connected in series, detection for detecting the number of rotations of each winding drum is performed. And a measuring instrument for measuring the outer diameter of a wire rod drawn by a reference set of dies, and a computing element for computing the die diameter of any set based on the detection value from the detector and the measuring instrument. A die diameter measuring device characterized by being provided with.