KR20190124956A - Apparatus for measuring straightness and method for manufacturing rod using same - Google Patents

Abstract

The present invention relates to a straightness measuring device for measuring a straightness of a wire rod in an in-line state after drawing to improve productivity, and improving the straightness when a deviation occurs and then cutting to manufacture a product, and the wire rod manufacturing method using the same. The straightness measuring device comprises: a measuring part for measuring a distance with the wire rod; a tube member installed in one side of the measuring part and rotating while surrounding the wire rod penetrating therethrough; and a driving part for rotating the tube member.

Description

Straightness measuring device and manufacturing method of wire rod using same {APPARATUS FOR MEASURING STRAIGHTNESS AND METHOD FOR MANUFACTURING ROD USING SAME}

The present invention is to measure the straightness of the wire rod in the in-line state after drawing to improve the productivity, improve the straightness when the deviation occurs, to produce a product by cutting the straightness measurement device and the wire rod using the same It is about a method.

In general, in order to manufacture the spring, the molten steel is first refined to have a predetermined composition, and the molten steel is injected into a mold to cast a steel ingot, followed by hot rolling to form a square steel piece, and then rolled into a rod shape to manufacture a wire rod. Subsequently, the wire is drawn to the desired diameter, then heated and quenched through induction heat treatment, tempering, and the resulting steel wire is cold to spring. Molding.

Here, one of the factors that can cause processing problems during the induction heating heat treatment is the straightness of the rod-shaped wire rod. If the straightness is bad, an eccentricity occurs when the wire is inserted into the heating furnace for heat treatment, and an eccentricity occurs, thereby resulting in a failure of the required product properties. In addition, even after the heat treatment may affect the straightness of the wire rod, which may lead to structural instability after forming the spring, leading to degradation of the stability and performance of the product.

In general, a method of measuring the straightness of wire rod is to cut the drawn wire rod, and then move to another measurement position such as a test panel and measure by dial gauge, which is a method of contacting the dial gauge while rotating the cut wire rod by 360 degrees. . This measurement method is time consuming, and if the warpage is severe, there is a problem in terms of economics and productivity, such as the process of scraping the wire rod (Scrap), or transfer to the position of the straightening roller to straighten.

(Patent Document 1) KR 2008-0001558 U

Accordingly, the present invention provides a straightness measuring device and a wire rod manufacturing method using the same, which measures the straightness of the wire rod in the inline state after drawing to improve the productivity, and improves the straightness when the deviation occurs, to cut the product to produce a product. Its main purpose is to help.

Straightness measuring apparatus according to the present invention, the measuring unit for measuring the distance to the wire rod; A tube member installed at one side of the measurement unit and rotating while surrounding the wire rod; And a driving part for rotating the tube member.

In addition, the wire rod manufacturing method according to the invention, the step of drawing the wire rod to reduce the diameter of the wire rod; Measuring the straightness of the wire rod immediately after the drawing step; And cutting the wire rod to a predetermined length.

According to the present invention as described above, heat treatment of the wire rods can be performed under the same conditions so that the quality of the product can be secured excellently, and even if the bending occurs severely, the straightening can be performed immediately, thereby improving economic efficiency and productivity. It can be effective.

1 is a perspective view showing a straightness measuring device according to the present invention, and a wire rod manufacturing equipment including the same.
2 is a flow chart showing a wire rod manufacturing method according to the present invention.

Hereinafter, the present invention will be described in detail through exemplary drawings. In adding reference numerals to the elements of each drawing, it should be noted that the same elements are denoted by the same reference numerals as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a perspective view showing a straightness measuring device according to the present invention, and a wire rod manufacturing equipment including the same. As shown here, the straightness measuring device according to the present invention, the measuring unit 10 for measuring the distance to the wire rod (1); A tube member 20 provided at one side of the measuring unit and rotating while surrounding the wire rod to pass therethrough; And a drive unit 30 for rotating the tube member.

As the measuring unit 10, for example, a spindle type electronic indicator such that the wire rod 1 and the meter reader 11 may be employed. Such a measuring unit has a wide measuring range and is preferably not affected by cutting oil or moisture.

Here, although the measuring unit is a spindle type electronic indicator, which is a type of contact displacement sensor, the measurement unit is illustrated, but the configuration of the measuring unit is not necessarily limited thereto, and a non-contact displacement sensor using an eddy current caused by a high frequency magnetic field, a laser, an ultrasonic wave, or the like. May be selected as the measuring unit.

In addition, the measurement unit 10 may include a wireless communication unit (not shown) for outputting the measurement data signal to the control unit 40 or the display unit 50.

The controller 40 compares the measured value input from the measuring unit 10 with a predetermined reference value, and when the reference value is greater than or equal to the reference value, operates the calibration roller 4 to be described later to perform straightening of the wire rod 1. .

The display unit 50 such as a monitor or the like may display the measurement data input via the control unit 40 or directly from the measurement unit 10 in any format such as a graph.

The tube member 20 may be made of metal, for example tool steel or the like. This is because it needs to hold the measuring unit 10 and connected to the driving unit 30 to rotate, so that a predetermined or more strength is required to maintain the shape and to ensure stability.

Due to the tube member 20, the wire rod (1) can penetrate the tube member and can measure the straightness of the wire rod using the measuring unit 10 in the inline state after drawing, the wire rod is rotated in the present invention It can not be configured so that the tube member equipped with the measuring unit is rotated approximately 360 degrees.

In the illustrated example, it is shown that the measuring unit 10 is installed on one side of the inner circumferential surface of the tube member 20, but is not limited thereto. For example, the measuring unit may be located at one end surface of the tube member.

The drive unit 30 may include a motor 31 and a transmission mechanism 32 interposed between the rotation shaft of the motor and the tube member 20. For convenience of illustration, an example in which the driving unit is disposed above the wire rod 1 is shown, but the arrangement of the driving unit is not necessarily limited thereto, and the driving unit may be disposed below the wire rod.

As the electric mechanism 32, for example, as shown in FIG. 1, the first gear 33 provided on the rotating shaft of the motor 31 and the outer circumferential surface of the tube member 20 are engaged with the first gear. The second gear 34 may be adopted. However, the configuration of the transmission mechanism is not necessarily limited to this, a belt mechanism or a chain mechanism may be used.

The straightness measuring apparatus according to the present invention may further include at least one support part 60 for supporting the rotation of the tube member on the outer circumferential surface of the tube member 20.

The support part 60 may include the rotating member 61 which contacts the outer peripheral surface of the tube member 20, and a pair of bearing parts 62 which support the rotating shaft of this rotating member.

As the rotating member 61, for example, as shown in FIG. 1, a gear member engaged with the second gear 34 formed on the outer circumferential surface of the tube member 20 may be employed. However, the configuration of the rotating member is not necessarily limited thereto, and a rolling member such as a roller or a ball may be used depending on the shape of the tube member.

In addition, the straightness measuring apparatus according to the present invention may further include at least one support portion 70 for supporting the movement of the wire rod under the wire rod (1).

The supporting portion 70 may include a slide surface portion 71 having a concave surface which slides while the wire rod 1 contacts, and a frame 72 that supports the slide surface portion at a predetermined height. These slide surface portions and the frame may be integrally formed, for example, made of metal such as stainless steel.

The wire rod 1 can move at the same speed as the previous process, for example the drawing speed.

Hereinafter, the operation of the straightness measuring device according to the present invention configured as described above will be briefly described.

The drawn wire 1 passes through the tube member 20 of the straightness measuring device according to the present invention in an inline state. At this time, the moving speed of the wire rod 1 may be the same as the wire speed.

Since the wire rod 1 cannot rotate, by operating the motor 31 of the drive unit 30 and transmitting the rotational force of the motor to the tube member 20 by the electric mechanism 32, the tube member is rotated and measured. The portion 10 may rotate approximately 360 degrees.

Since the wire rod 1 is traveling at a constant moving speed, the movement trajectory of the tube member 10 with respect to the wire rod is helical.

The measurement unit 10 outputs the measurement data signal to the control unit 40 or the display unit 50 through the wireless communication unit, the operator can check the measurement data by a display unit such as a monitor.

2 is a flow chart showing a wire rod manufacturing method according to the present invention. As shown therein, the wire rod manufacturing method according to the present invention comprises the steps of: drawing a wire rod such that the diameter of the wire rod is reduced; Measuring the straightness of the wire rod immediately after the drawing step; And cutting the wire rod to a predetermined length.

The drawing of the wire rod 1 passes the wire rod through a die 2 (see Fig. 1) having a smaller cross-sectional area on the outlet side than the inlet. The die may be made of cemented carbide, for example tungsten carbide or the like.

Such a die 2 may have a cross-sectional reduction rate of 10 to 30% per pass, and when the strength of the wire rod 1 is large, a plurality of dice may be arranged and drawn in two or three passes. That is, a plurality of dice can be arranged in series so as to reduce the inner diameter from the upstream to the downstream, and the wire rod can be passed sequentially. It is preferable to reduce the diameter of the wire to less than one pass, and to increase the manufacturing cost to more than four passes.

In the wire rod manufacturing method according to the present invention, the step of measuring the straightness of the wire rod immediately after the drawing step is performed. Measuring the straightness may be made by the straightness measuring apparatus of the present invention described with reference to FIG.

After drawing, the straightness of the wire rod 1 is measured using the measuring unit 10 of the straightness measuring device in the inline state, but since the wire rod is continuously drawn out from the die 2, the measurement unit cannot rotate. Measure straightness while rotating approximately 360 degrees relative to.

The measurement unit 10 outputs the measurement data signal to the control unit 40 or the display unit 50 through the wireless communication unit, the operator can check the measurement data by a display unit such as a monitor.

The controller 40 electrically connected to the measuring unit 10 compares the measured value input from the measuring unit with a predetermined reference value.

For example, when the measured value is less than the reference value, it is determined that there is no deviation, and the wire rod 1 is cut to a predetermined length. Cutting the wire rod may use a cutter 3 (see FIG. 1) such as a Shear Knife.

On the other hand, if the measured value is greater than the reference value, it is determined that a deviation has occurred, and the control unit 40 can selectively perform a calibration step of straightening the wire rod 1 while operating the calibration roller 4 (see FIG. 1). have.

The straightening roller 4 can be moved (or raised) by the actuator 5 selectively when the bending occurs in the wire rod 1 and rotated in contact with the surface of the wire rod. In the illustrated example, two pairs of straightening rollers are shown above and below the wire rod, and the other pair of straightening rollers is shown as two pairs of straightening rollers arranged to the left and right of the wire rod, but the arrangement of the straightening rollers is not necessarily limited thereto.

In addition, when only a pair of straightening rollers 4 are arranged, the effect of straightening by the straightening rollers is small, and when three or more pairs are used, it is not preferable in terms of economics of equipment. good.

On the surface of each of the straightening roller 4 can be formed a concave groove of approximately semi-circular cross section, the rotational speed of the wire rod 1 should be maintained so as to move at the same speed as the drawing speed.

As the actuator 5, a fluid pressure cylinder or an electric actuator such that the rotating shaft of the calibration roller 4 can be connected to the end of the working rod can be used, but is not necessarily limited to these examples.

As described above, after the calibration step of improving the straightness when a deviation occurs in the wire rod, the above-described wire rod is cut into a predetermined length.

Example

Hereinafter, the present invention will be described in more detail with reference to Examples.

An alloy steel having a predetermined component system was cast to form a rectangular steel piece having a size of 160 mm × 160 mm, and then hot rolled to prepare a wire having a diameter of 15 mm. The wire rod having a diameter of 15 mm was drawn at a cross-sectional reduction rate of approximately 10.7% while passing a plurality of dice at a drawing speed of 50 m / min, and formed into a wire rod having a diameter of 13.4 mm.

Rotation angle of measuring part (degrees) Deviation
(mm) Average
(mm) 0 45 90 135 180 225 270 315 Inventive Example 1 0 0.7 0.2 0.3 -0.8 0.4 0.2 0.3 0.08 0.09 Inventive Example 2 0 0.5 0.3 0.3 -0.5 0.2 0.4 0.4 0.1 Inventive Example 3 0 0.2 0.5 0.7 -0.8 0.3 0.5 0.2 0.1 Comparative Example 1 0 0.8 0.2 0.3 -0.1 0.2 0.3 0.8 0.16 0.17 Comparative Example 2 0 0.7 0.4 0.5 -0.3 0.5 0.4 0.7 0.18 Comparative Example 3 0 0.2 0.8 0.7 -0.4 0.6 0.2 0.6 0.17 Inventive Example 4 0 6.7 10.2 7.8 4.5 -1.8 -2 -1.2 1.51 Inventive Example 5 0 0.4 0.2 0.2 0.1 0.2 0.2 0.3 0.1

In Table 1, Inventive Example 1-3 is a result of measuring the amount of deviation with respect to the zero point after cutting the wires manufactured by the wire rod manufacturing method according to the present invention.

Comparative Example 1-3 is the result of measuring the wire rods manufactured by the manufacturing method according to the prior art after calibration. In other words, after the wire is cut after drawing, the straightness of the cut wire is measured, and the result of the deviation is measured again by straightening with a calibration roller.

In order to give reliability to the measured values, the measurement sites of each wire rod were made similar.

The rotation angle of the measurement part was 45 degrees, and the measured value at zero degree was made into zero.

The magnitude of the deviation was defined as [sum of measured values] / 2. An average is an average of the deviation which three invention examples and three comparative examples have, respectively.

Inventive Example 1 shows that the deviation is 0.08 mm, and Inventive Examples 2 and 3 are each bent slightly within an acceptable range as 0.1 mm.

On the contrary, in Comparative Example 1-3 measured after cutting at the exit of the drawing die and straightening with a calibration roller, the deviations were 0.16 mm, 0.18 mm, and 0.17 mm, respectively. Although similar sites were measured after calibration, it was confirmed that there was still a deviation of straightness, and in particular, it was confirmed that the overall average appeared almost twice as high.

Meanwhile, Inventive Example 4 and Inventive Example 5 show deviations before and after the calibration step.

Inventive Example 4 measured straightness in an in-line state after passing through a die, but a deviation of 1.51 mm occurred, which was not suitable for use as a product. Without cutting this invention example 4, the straightening roller was operated to improve straightness and then cut.

As a result of measuring the wire rod cut after the calibration, it can be seen that the deviation of Inventive Example 5 is 0.1 mm, which ensures straightness.

According to the present invention as described above, heat treatment of the wire rods can be performed under the same conditions so that the quality of the product can be secured excellently, and even if the bending occurs severely, the straightening can be performed immediately, thereby improving economic efficiency and productivity. It can be effective.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the specification and the drawings are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

1: wire rod 2: dice
3: cutter 4: straightening roller
10: measuring unit 20: tube member
30: drive unit 40: control unit
50: display part 60: support part
70: base

Claims (12)

A measuring unit measuring a distance from the wire rod;
A tube member installed at one side of the measuring unit and rotating while surrounding the wire rod penetrating therethrough; And
Drive unit for rotating the tube member
Straightness measuring device comprising a.
The method of claim 1,
The measuring unit includes a straightness measurement device comprising a wireless communication unit for outputting the measurement data signal to the control unit or the display unit.
The method of claim 1,
The driving unit,
Motor,
An electric mechanism interposed between the rotating shaft of the motor and the tube member
Straightness measuring device comprising a.
The method of claim 3,
The electric mechanism,
A first gear provided on the rotating shaft of the motor,
A second gear formed on an outer circumferential surface of the tube member and engaged with the first gear
Straightness measuring device comprising a.
The method of claim 1,
Straightness measuring device further comprises at least one support for supporting the rotation of the tube member on the outer peripheral surface of the tube member.
The method of claim 5,
The support portion,
A rotating member in contact with the outer circumferential surface of the tube member;
A pair of bearing portions for supporting a rotating shaft of the rotating member
Straightness measuring device comprising a.
The method of claim 1,
In order to support the movement of the wire rod, the straightness measuring device further comprises at least one supporting portion having a sliding surface portion which is sliding in contact with the wire rod.
Drawing the wire rod to reduce the diameter of the wire rod;
Measuring the straightness of the wire rod immediately after the drawing step; And
Cutting the wire rod to a certain length
Wire rod manufacturing method comprising a.
The method of claim 8,
Measuring the straightness of the wire, wire rod manufacturing method, characterized in that for measuring while rotating the measurement unit of the straightness measuring device with respect to the wire in the inline state.
The method of claim 9,
Measuring the straightness of the wire rod, the wire rod manufacturing method, characterized in that for outputting a measurement data signal via wireless communication.
The method of claim 9,
And further comprising a calibration step of straightening the wire rod when it is determined that a deviation occurs because the measured value measured in the straightness of the wire rod is greater than or equal to a reference value.
The method of claim 11,
After the calibrating step, the step of cutting the wire to a predetermined length is carried out, characterized in that implemented.

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