JP2017100161A - Piercer mill shaft cor measuring system, piercer mill shaft core measuring method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piercer mill shaft core measuring system in which the way to move a shaft core of a cored bar or a pass line in order to decrease an eccentric uneven thickness is identified online.SOLUTION: In displacement between a shaft core of a cored bar 13 and a shaft core of a billet 20 occurring when pierced by a piercer mill, a shaft core displacement amount and the direction cannot be identified easily because the displacement of the shaft core between the cored bar 13 and the billet 20 and also other factors are involved during piercing. However, the present inventors discover the fact that the displacement between the shaft core of the cored bar 13 and that of the billet 20 has correlation with the displacement amount and direction when a plug 12 comes in contact with the billet 20 and the displacement occurs first. Then, the displacement amount between the pre-initiation of the piercing and the immediately after the initiation of the piercing is derived by the displacement amount of the cored bar 13 (horizontal direction shift amount ΔX') due to the shaft core displacement in a horizontal direction (X-axis direction) and the displacement amount of the cored bar 13 (vertical direction shift amount ΔY'_t) due to the shaft core displacement in a vertical direction (Y-axis direction) using a two-dimensional laser displacement gauge 15, and the amount of the shaft core displacement and the direction are determined, and whereby the occurrence of the shaft core displacement can be decreased.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a piercer mill axis measurement system, a piercer mill axis measurement method, and a program, and is particularly suitable for use in measuring the deviation of the axis of a core metal in a piercer mill (piercing machine).

As a technique for producing a seamless pipe such as a seamless steel pipe, there is a technique for producing a hollow shell from a material such as a billet heated in a heating furnace by using a piercer mill (piercing machine).
Some piercer mills include a pair of inclined rolls and a plug. The pair of inclined rolls are disposed so as to face each other with a space between each other across the billet pass line and to be inclined with respect to the pass line. The piercer mill pushes the billet into the plug (core metal) while rotating the billet in the circumferential direction by an inclined roll, and drills and rolls the material into a hollow shell.

  In the piercer mill, a shift between the axis of the plug and the core metal and the axis of the billet (material) or the pass line becomes a problem. If piercing and rolling are performed in a state where such an axial misalignment has occurred, an eccentric thickness deviation occurs in the hollow shell. In particular, primary uneven thickness is difficult to eliminate or suppress in the next step. In the next stage of the piercer mill, the thickness of the hollow shell tube manufactured by the piercer mill is measured by a γ-ray thickness gauge, but the average thickness is measured by the γ-ray thickness gauge, which is due to the deviation of the shaft core described above. It is difficult to detect uneven thickness. Also, in the final process, it is possible to detect the uneven thickness generated in the hollow shell using an ultrasonic wall thickness gauge etc., but until the result of detecting the uneven thickness is reflected in the operation in the Pierce mill Takes time.

  There are a variety of factors causing the eccentric thickness deviation in the hollow shell, but the ratio of the above-described axial deviation to the factor causing the eccentric thickness deviation is not small. Therefore, Patent Document 1 discloses the following technique. A laser spot is emitted from a laser light emitting device arranged on the entrance side of the piercer mill so as to coincide with the axis of the pass line. The laser spot is photographed from the axial direction by an inclined roll unit or the like, and the axis of the inclined roll is adjusted so that the laser spot is positioned at the center of the image. Using the image thus taken, each roll axis is adjusted so that the center of the laser spot is the center of the image in each roll unit.

  However, in the technique described in Patent Document 1, measurement must be performed offline. Such off-line work cannot be performed frequently, for example, only once every several months. In actual drilling / rolling operations, for example, drilling / rolling is performed several hundred times a day, and the load on the equipment is applied each time. Become. Therefore, it is not possible to detect an axial misalignment at an early stage online during operation. Therefore, it is desired to measure the deviation between the axis of the plug (core metal) and the axis of the billet (material) or pass line at the operation stage of the Piercer mill (that is, online). As this type of technology, there are technologies described in Patent Documents 2 to 4.

  Patent Document 2 discloses the following technique. A laser displacement meter is installed on the exit side of the piercer mill to measure the amplitude of the metal core during piercing and rolling. Based on the fact that there is a correlation between the amplitude of the core metal and the amount of uneven thickness, if the measured amplitude of the core metal deviates from the control value, the thickness of the core metal is large and the core metal is replaced.

  Patent Document 3 discloses the following technique. A displacement measuring device is installed on the exit side of the inclined roll to measure the amplitude of the cored bar and shell (material being drilled) during drilling and rolling. Based on the fact that there is a correlation between the swinging amplitude of the core metal / shell during piercing / rolling and the uneven thickness ratio of the shell, the swinging amplitude of the core metal or shell is monitored. When this swinging amplitude is large, measures to prevent uneven thickness such as rolling stop, prevention of material heat deviation, adjustment of the inclination and eccentricity of the cored bar, and position adjustment of the drilling machine are taken.

  Patent Document 4 discloses the following technique. A uniaxial CCD camera is installed so that only one cross section in a direction perpendicular to the axis of the shell at the time of piercing / rolling falls within the field of view. Using this single-axis CCD camera, the amplitude of the vertical vibration of the shell during drilling and rolling is measured.

JP-A-6-153200 JP 2005-2111912 A JP 61-119318 A JP-A-4-157005

  However, in the technique described in Patent Document 2, it is not clear which part of the core bar to measure the amplitude, and when the eccentric eccentric thickness of the hollow shell has occurred, the core bar or the shaft core of the pass line It is not easy to specify in which direction the eccentric eccentric thickness of the hollow shell is reduced. Further, although it is described that a measure of replacing the core metal is taken when the amplitude of the core metal is large, it cannot be said that the measure is necessarily effective. This is because, for example, the amplitude of the metal core also varies depending on the uneven heat of the material and the backlash generated in the piercer mill.

  Further, in the technique described in Patent Document 3, there is a correlation between the swinging amplitude of the cored bar / shell during piercing / rolling and the thickness deviation ratio of the shell. However, the amount of runout of the cored bar or shell during piercing / rolling and the eccentric thickness deviation of the hollow shell do not always match with high accuracy. For example, when the whirling of the metal core and the shell are synchronized, the accuracy of detecting the eccentric thickness deviation of the hollow shell is reduced. Therefore, it is not easy to specify in which direction the shaft core of the metal core or the pass line is moved to reduce the eccentric thickness of the hollow shell, and what measures are effective. It is not easy to specify whether or not.

  In the technique described in Patent Document 4, the amplitude of only the vertical direction of the shell is measured. Therefore, in addition to being unable to measure the amplitude in the horizontal direction, it is not easy to specify in which direction the eccentric core thickness of the hollow shell is reduced by moving the core of the core bar or pass line. Also, it is not easy to specify what measures are effective.

  As described above, in the techniques described in Patent Documents 2 to 4, when the eccentric eccentric thickness of the hollow shell is generated, the eccentric eccentric thickness of the hollow basic tube can be changed by moving the shaft core of the core metal in any direction. It was not easy to specify whether to reduce. In addition, as described above, in the techniques described in Patent Documents 2 to 4, it is possible to specify what measures are effective when an eccentric thickness deviation of the hollow shell occurs. It's not easy. In this case, it is conceivable to extract only the misalignment between the shaft core of the metal core and the shaft core of the line. However, the techniques described in Patent Documents 2 to 4 do not provide such a method.

The present invention has been made in view of the above problems, and when the eccentric eccentric thickness of the hollow shell has occurred, the heat of the material and the runout of the core due to the backlash generated in the piercer mill are reduced. Except for the core misalignment of the core metal and billet, if the misalignment between the core core and the pass line occurs, the direction of the hollow core tube should be changed in which direction A first object is to enable online identification of whether the eccentric thickness deviation is reduced.
It is a second object of the present invention to be able to extract as much as possible the deviation between the axis of the cored bar and the pass line.
This is because, when drilling is started and the drilling of the material with a plug, a core metal, an inclined roll, etc. is advanced, the shaft core and the pass line are misaligned in addition to the shaft center misalignment, This is because, for example, the runout due to the above causes a measurement of the total runout, and it is impossible to extract only the misalignment between the core metal and the pass line.

  The piercer mill shaft measuring system according to the present invention includes a plug that is pushed into a material for manufacturing a hollow shell, and a longitudinal end of the plug that is coaxial with the plug at an end opposite to the material. A cored bar arranged in such a manner, an inclined roll for rotating the material about its longitudinal axis as a rotation axis, and a holding roll arranged in the axial direction for holding the cored bar. A piercer mill shaft core measuring system for deriving a deviation between the axis of the cored bar and a pass line in the piercer mill having a measuring means disposed on the exit side of the piercer mill, at least in two different directions Measuring means for optically measuring the position of the cored bar in the core of the cored bar measured at different timings before and after the start of drilling of the billet by the piercer mill by the measuring unit Based on the location, the amount of movement of the metal core, and having a, a first derivation means for deriving at each of two different directions perpendicular to each other the longitudinal axis of said metal core.

  The method of measuring a piercer mill axis according to the present invention includes a plug pushed into a material to produce a hollow shell, and a longitudinal end of the plug that is coaxial with the plug at an end not facing the material. A cored bar arranged in such a manner, an inclined roll for rotating the material about its longitudinal axis as a rotation axis, and a holding roll arranged in the axial direction for holding the cored bar. A piercer mill axis measuring method for deriving a deviation between an axis of the cored bar and a pass line in the piercer mill having a measuring means disposed on the exit side of the piercer mill, wherein at least two directions different from each other A measurement step of optically measuring the position of the metal core in the step, and a position of the metal core measured at different timings before and after the start of billet drilling by the piercer mill by the measurement process. There are, the amount of movement of the metal core, characterized by having a a deriving step of deriving in each of two different directions perpendicular to each other the longitudinal axis of said metal core.

  The program of the present invention is arranged so as to be coaxial with the plug at a plug that is pushed into the material to produce a hollow shell, and an end of the plug that is not opposed to the material in the longitudinal direction. In a piercer mill having a cored bar, an inclined roll for rotating the material about a longitudinal axis thereof, and a holding roll arranged in the axial direction for holding the cored bar, A program for causing a computer to derive a deviation between an axis of a core bar and a pass line, and measuring means arranged on the exit side of the piercer mill, at least in two different directions Based on the position of the core metal measured at different timings before and after the start of drilling of the billet by a piercer mill by a measuring means for optically measuring the position of the core metal in , The amount of movement of the metal core, characterized in that to execute a derivation step of deriving the respective longitudinal axis perpendicular mutually different two directions of the core metal into the computer.

According to the present invention, the amount of movement of the metal core in each of two different directions perpendicular to the longitudinal axis of the metal core is measured and the drilling of the billet is started in the piercer mill by the measuring means arranged on the exit side of the piercer mill. Derivation is based on the position of the core bar measured at different timings before and after the start (in particular, immediately after the start is preferable). Therefore, when the eccentric eccentric thickness of the hollow shell has occurred, only the shaft misalignment of the core metal and billet is extracted, excluding the heat of the material and the runout of the core metal due to the backlash generated in the piercer mill. When a deviation between the shaft core and the pass line occurs, it is possible to specify online in which direction the shaft core of the core metal or the pass line is moved to reduce the eccentric eccentric thickness of the hollow shell.
In addition, the amount of movement of the core metal in each of two mutually different directions perpendicular to the longitudinal axis of the core metal is measured at different timings within a predetermined measurement time by measuring means arranged on the exit side of the piercer mill. Derived based on the position of the cored bar. Accordingly, it is possible to suppress the movement amount of the derived cored bar from including the amount of movement other than the deviation of the axis of the cored bar from the pass line. Therefore, it is possible to extract as much as possible the deviation between the axis of the metal core and the pass line.

It is a figure which shows the 1st example of a structure of a piercer mill axial center measuring system. It is a figure which illustrates notionally an example of an axial misalignment. It is a figure which shows an example of a functional structure of an axial misalignment calculating apparatus. It is a figure which shows the 1st example of a beam profile notionally. It is a figure which shows the 1st example of a beam profile and its peak. It is a figure explaining an example of the method of deriving | leading-out the distance difference with respect to the reference | standard peak position in a perpendicular direction (Y-axis direction) of the measurement peak position in a perpendicular direction (Y-axis direction). It is a flowchart explaining an example of operation | movement of an axial misalignment calculating apparatus. It is a figure which shows an example of the perpendicular | vertical direction movement amount and the horizontal direction movement amount derived | led-out by the axial center deviation calculating device. It is a figure which shows notionally an example of the amount of deflections of a billet before and after adjustment of the axis of a metal core. It is a figure which shows the 2nd example of a structure of a piercer mill axial center measuring system. It is a figure which shows notionally the 2nd example of a beam profile. It is a figure which shows notionally the 2nd example of a beam profile and its peak. It is a figure which shows an example of the time chart about perforation and a measurement.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
First, the first embodiment will be described.
<Configuration of piercer mill shaft measurement system>
FIG. 1 is a diagram illustrating an example of a configuration of a piercer mill shaft measuring system. Specifically, FIG. 1A is a diagram illustrating an example of the overall configuration of the piercer mill shaft measurement system. FIG. 1B shows the positional relationship between the metal core 13 and the two-dimensional laser displacement meter 15 when viewed from the direction along the pass line PL of the billet 20 (the direction of the white arrow line shown in FIG. 1A). It is a figure which shows an example. In the present embodiment, a case where a hollow shell is manufactured by drilling and rolling a billet 20 which is an example of a raw material using a punching machine (piercer mill) 10 will be described.

The punching machine 10 includes a pair of inclined rolls 11 a and 11 b, a plug 12, a cored bar 13, and a guide 14. In addition to these, the punching machine 10 has a known configuration necessary as a piercer mill. For example, the drilling machine 10 also has a plurality of holding rolls arranged in the axial direction to hold the cored bar 13.
The inclined rolls 11a and 11b are arranged at positions facing each other with a space therebetween via the pass line PL. The inclined rolls 11a and 11b are inclined from the piercer mill exit side toward the entry side. The inclined rolls 11 a and 11 b rotate the billet 20 in the circumferential direction (that is, using the longitudinal axis of the billet 20 as a rotation axis) and roll the billet 20 together with the plug 12. As shown in FIG. 1 (a), a centering punch hole 21, which is a recess for guiding the position of the plug 12 to the center of the billet 20, is formed at the center of the end surface on the top side of the billet 20. .

  The inclined rolls 11a and 11b may be a cone type or a barrel type. In FIG. 1, the case where the punch 10 is a two-roll type provided with a pair of inclined rolls 11a and 11b is shown as an example. However, the punch 10 is not limited to the two-roll type. For example, when viewed from the direction along the pass line PL, three or more inclined rolls arranged around the pass line PL are arranged so as to have a rotationally symmetrical positional relationship about the pass line PL. May be provided.

  The plug 12 is a position between the pair of inclined rolls 11a and 11b, and a position where the longitudinal axis of the plug 12 coincides with the pass line PL (its axis) is set as a target position. The plug 12 has a circular cross section, and its outer diameter increases from the front end to the rear end of the plug 12. Thus, the shape of the plug 12 is substantially bullet-like.

  When the billet 20 is pierced and rolled, the plug 12 is pushed into the center of the end surface on the top side of the billet 20 (that is, the end surface facing the plug 12) to pierce the billet 20.

  The metal core 13 is a member that extends in the direction of the pass line PL (its axial core), and is a member for arranging the plug 12 at a predetermined position. The distal end of the core metal 13 is coupled to the proximal end surface of the plug 12. For example, the base end surface of the plug 12 has a coupling portion that is recessed in the axial direction, and the distal end portion of the cored bar 13 is inserted into the coupling portion and fixed. At this time, the longitudinal axis of the plug 12 and the longitudinal axis of the core metal 13 are matched (that is, the plug 12 and the core metal 13 are coaxial). As described above, the target position of the plug 12 is a position where the longitudinal axis of the plug 12 coincides with the pass line PL. Therefore, the target position of the cored bar 13 is also a position where the longitudinal axis of the cored bar 13 coincides with the pass line PL. In the following description, the longitudinal axis of the plug 12 and the longitudinal axis of the core metal 13 are abbreviated as the axial core of the plug 12 and the axial core of the core metal 13 as necessary.

  The guide 14 is disposed in front of the inclined rolls 11a and 11b (on the positive direction side of the Z axis). The guide 14 suppresses vibration of the billet 20. The vibration of the billet 20 is, for example, that the billet 20 reciprocates in a direction perpendicular to the pass line PL in a side view or a plan view.

  The two-dimensional laser displacement meter 15 is for measuring the displacement of the cored bar 13 in the horizontal direction (X-axis direction) and the measurement direction (Y / sin θ-axis direction) online. The measurement direction is the visual field direction (optical axis direction) of the two-dimensional laser displacement meter 15. That is, the measurement direction is a direction along the alternate long and short dash line in FIG. 1A and is a direction from the two-dimensional laser displacement meter 15 toward the cored bar 13.

  In the present embodiment, the two-dimensional laser displacement meter 15 performs measurement by an optical cutting method. That is, the two-dimensional laser displacement meter 15 irradiates the object with line-shaped laser light, acquires the reflected light as height data, and measures the measurement direction (optical axis) between the two-dimensional laser displacement meter 15 and the object. Direction) distance based on triangulation. In the following description, this distance is referred to as a measurement distance L as necessary (see FIG. 1A). Thereby, the position of the measurement direction of the metal core 13 is measured.

Note that the two-dimensional laser displacement meter 15 is a technique for measuring the distance from the reflected light from the measurement object to the measurement object in two dimensions, and therefore, when the metal core 13 described in the present embodiment is measured, Although it is acquired as measurement data of the arc-shaped reflected light, hereinafter, the acquired arc-shaped measurement value will be referred to as a beam profile.
In addition, the two-dimensional laser displacement meter 15 is arranged so that the pixels of the light receiving sensor that receives the reflected light are arranged in the horizontal direction (X-axis direction) of the cored bar 13. As a result, the peak position of the received beam profile becomes the distance to the metal core 13, and the horizontal position (X-axis direction) of the metal core 13 is measured from the horizontal pixel value of the light receiving sensor. The two-dimensional laser displacement meter 15 itself can be realized by a known technique.

In the present embodiment, the wavelength λ of the laser light is 405 [nm]. However, since the cored bar 13 is not a hot material, the wavelength λ of the laser beam is not limited.
As shown in FIG. 1A, the two-dimensional laser displacement meter 15 is installed on the exit side of the drilling machine 10. The two-dimensional laser displacement meter 15 is installed with an angle θ with respect to the pass line PL and an angle φ with respect to the horizontal direction (X-axis direction). Further, in the present embodiment, an area of 100 [mm] centered on the cored bar 13 in the horizontal direction (X-axis direction) is defined as a visual field width in the horizontal direction (X-axis direction) of the two-dimensional laser displacement meter 15. However, if the field of view of the two-dimensional laser displacement meter 15 includes a region of several millimeters including the uppermost end (end portion in the negative direction of the Y-axis) of the core bar 13, the two-dimensional laser displacement meter 15 The visual field width in the horizontal direction (X-axis direction) is not limited to this.

  The diameter of the cored bar 13 varies widely, and the cored bar 13 having various diameters is used. In this embodiment, in order to simplify the explanation, the two-dimensional laser displacement meter 15 is installed at a position where the shortest distance between the two-dimensional laser displacement meter 15 and the cored bar 13 in the optical axis direction is 400 [mm]. That is, in the present embodiment, the reference value of the measurement distance L described above is 400 [mm]. In this embodiment, the measurement resolution of the light receiving sensor of the two-dimensional laser displacement meter 15 is 0.3 [mm / pixel] at the reference value (= 400 [mm]) of the measurement distance L. In the following description, this measurement resolution is referred to as a reference resolution as necessary. The measurement resolution of the light receiving sensor of the two-dimensional laser displacement meter 15 can be arbitrarily set according to the pixel array of the light receiving sensor. The measurement resolution of the light receiving sensor of the two-dimensional laser displacement meter 15 is a distance in the real space per pixel of the light receiving sensor. By using this measurement resolution, the distance in the real space can be obtained from the number of pixels. .

  Further, in the present embodiment, as an example, the position of the two-dimensional laser displacement meter 15 is changed so that the reference value of the measurement distance L is 400 [mm] even if the diameter of the cored bar 13 is changed. I will give you a description. However, if the reference value of the measurement distance L is maintained at 400 [mm], the reference value of the measurement distance L is changed when interference between the two-dimensional laser displacement meter 15 and equipment occurs.

Further, as shown in FIG. 1A, in the present embodiment, the angle θ is set to 45 [°]. However, the angle θ is not limited to 45 [°] as long as the operation by the drilling machine 10 is not hindered. As shown in FIG. 1B, in the present embodiment, the two-dimensional laser displacement meter 15 is installed such that the angle φ with respect to the horizontal direction (X-axis direction) is 90 [°]. That is, in the present embodiment, the two-dimensional laser displacement meter 15 is installed along the vertical direction (Y-axis direction).
Note that, under the above conditions, it is preferable to install the two-dimensional laser displacement meter 15 so as to be as close as possible to the cored bar 13 as long as the operation by the drilling machine 10 is not hindered.

In FIG. 1A and FIG. 13, the tip detector 16 has a top end face (Z-axis negative surface) of the billet 20 that is transported along the guide 14 in the negative direction of the Z-axis by a transport mechanism (not shown). , The measurement start trigger signal 1301 is transmitted. Although the measurement itself has not yet started at this time, a timer for a predetermined offset time OT is started due to the measurement start trigger signal 1301. In FIG. 13, the broken line extending in the vertical direction indicates an example of the position where the end surface on the top side of the billet 20 reaches at time t1 to t4.
In this embodiment, after the end side on the top side of the billet 20 is detected at time t1, the end side on the top side of the billet 20 that continues to be conveyed through the offset time OT starts normal measurement when the offset time OT has passed. The position of the tip detector 16 is determined so as to be positioned at a position (a position of a broken line extending in the vertical direction at the measurement start time t2).
The normal measurement start position is, for example, a position where the top end surface of the billet 20 and the tip of the plug 12 are slightly spaced.

Then, after the lapse of the offset time OT, the measurement described later is actually started with respect to the end face on the top side of the billet 20 that has passed the normal measurement start position, and the deviation amount is measured over a predetermined time. .
That is, since it takes a further time after the measurement is started until the end surface on the top side of the billet 20 contacts the tip of the plug 12 (from the measurement start time t2, the end surface on the top side of the billet 20 is connected to the plug 12). By setting a predetermined measurement time MT to be longer than the time period PT (see time PT until time t3 at which the tip contacts the tip), before the start of drilling of the billet 20 (from time t3 when the drilling of the billet 20 is assumed to start) It is possible to acquire both the displacement of the core bar 13 before and the displacement of the core bar 13 after the start of drilling (after time t3 when the drilling of the billet 20 is assumed to start). Then, when the predetermined measurement time MT elapses and time t4 is reached, the measurement is terminated.

  The tip detector 16 includes, for example, a projector and a light receiver. For example, the tip detector 16 can be configured to detect the end surface on the top side of the billet 20 when light projected from the projector is no longer received by the light receiver. The tip detector 16 itself can be realized by a known technique. In addition, the existing thing may be utilized as the front-end | tip detector 16 in the manufacturing line of the hollow shell by the punching machine 10, and you may newly install the exclusive front-end | tip detector 16. FIG.

When the predetermined offset time elapses after receiving the measurement start trigger signal 1301 transmitted from the tip detector 16, the axial misalignment calculation apparatus 100 receives the measurement of the two-dimensional laser displacement meter 15 at the predetermined measurement time MT from that timing. Based on the measurement result, the amount of deviation between the pass line PL and the axis of the cored bar 13 in the horizontal direction (X-axis direction) and the vertical direction (Y-axis direction) is calculated. The predetermined measurement time MT is determined in advance so that a measurement result by the two-dimensional laser displacement meter 15 is obtained only during a certain period including immediately before and after the plug 12 contacts the end surface on the top side of the billet 20, for example. For example, the predetermined measurement time MT is determined from the range of 0.01 [s] to 0.5 [s].
In the following description, the deviation between the pass line PL and the axis of the core 13 is referred to as an axis misalignment as necessary. In addition, the shaft misalignment calculating device 100 calculates the amount of deviation due to the shaft misalignment and the direction of the shaft misalignment. In addition, since the predetermined offset time described above is determined according to the arrangement of the tip detector 16, the predetermined offset time described above may be 0 (zero) depending on the arrangement of the tip detector 16.

FIG. 2 is a diagram for conceptually explaining an example of axial misalignment. Specifically, FIG. 2A shows a case where no axial misalignment occurs, and FIG. 2B shows a case where an axial misalignment occurs.
As shown in FIG. 2A, when the axis of the plug 12 and the cored bar 13 and the pass line PL are coincident with each other, there is no axial misalignment.

  On the other hand, in the example shown in FIG. 2B, the axis of the plug 12 and the core 13 and the pass line PL do not coincide with each other, indicating that there is an axial misalignment of the deviation amount AG. 2B shows the axial misalignment in the vertical direction (Y-axis direction) for convenience of description, the axial misalignment is a component in the horizontal direction (X-axis direction) and the vertical direction (Y-axis direction). ) Ingredients. The absolute value (total displacement) of the deviation due to the axial misalignment described above is the sum of the square of the component in the horizontal direction (X-axis direction) and the square of the component in the vertical direction (Y-axis direction). Expressed as square root.

In the following description, the amount of deviation due to the axial misalignment is referred to as a movement amount as necessary, and the amount of deviation of the core bar 13 due to the axial misalignment in the horizontal direction (X-axis direction) is the horizontal direction moving amount as necessary. The shift amount of the metal core 13 due to the axial misalignment in the vertical direction (Y-axis direction) is referred to as the vertical movement amount as necessary.
The shaft misalignment calculating device 100 determines whether or not the absolute value of at least one of the horizontal direction movement amount and the vertical direction movement amount exceeds a threshold value set in advance for each.

  When it is determined by the shaft misalignment calculation device 100 that at least one of the horizontal movement amount and the vertical movement amount exceeds a preset threshold value for each of the output devices 200, Information on the amount of movement in the horizontal direction, the amount of movement in the vertical direction, the amount of deviation due to axial misalignment, and the direction of axial misalignment is output. As the output form, for example, at least one of display on a computer display, transmission to an external device, and storage on a storage medium can be adopted.

<Axial misalignment calculation device 100>
Next, an example of the shaft misalignment calculation device 100 will be described in detail.
The hardware of the axis misalignment calculation device 100 is realized by using, for example, an information processing device including a CPU, ROM, RAM, HDD, and various interfaces, or dedicated hardware. FIG. 3 is a diagram illustrating an example of a functional configuration of the shaft misalignment calculation apparatus 100. Below, an example of the function which the axis misalignment calculating apparatus 100 has is demonstrated.

[Lead edge detection determination unit 101]
The tip detection determination unit 101 determines whether or not the tip detector 16 has detected the top end surface of the billet 20. As described above, the tip detector 16 transmits the measurement start trigger signal 1301 when detecting the top end surface of the billet 20. Therefore, when the tip detection determination unit 101 receives the measurement start trigger signal 1301, the tip detection unit 16 determines that the top end surface of the billet 20 has been detected, and starts a timer for measuring a predetermined offset time OT. To start.

[Beam profile creation unit 102]
When a predetermined offset time OT elapses after the tip end detection determination unit 101 determines that the end face on the top side of the billet 20 has been detected by the tip detection determination unit 101, the beam profile creation unit 102 continues until a predetermined measurement time MT elapses from that timing. Based on the measurement result of the two-dimensional laser displacement meter 15, a beam profile is repeatedly created at a predetermined sampling period. In this embodiment, the beam profile is information indicating the position of the cored bar 13 in the horizontal direction (X-axis direction) and the measurement direction when viewed from the two-dimensional laser displacement meter 15. As described above, the measurement direction is the visual field direction (optical axis direction) of the two-dimensional laser displacement meter 15 (see the one-dot chain line in FIG. 1A). In addition, as described above, the predetermined measurement time MT is such that, for example, the measurement result by the two-dimensional laser displacement meter 15 can be obtained only in the period immediately before and immediately after the plug 12 contacts the top end surface of the billet 20. Predetermined. As described above, the predetermined measurement time MT is, for example, a time of 0.01 [s] to 0.5 [s]. The predetermined sampling period is, for example, 1 [ms].

FIG. 4 is a diagram conceptually illustrating an example of a beam profile.
As described above, the pixels of the light receiving sensor of the two-dimensional laser displacement meter 15 are arranged so as to be aligned in the horizontal direction (X-axis direction) of the cored bar 13. Therefore, in FIG. 4, the value of the X axis corresponds to the pixel position of the light receiving sensor of the two-dimensional laser displacement meter 15. The value of the Y / sin θ axis corresponds to the measurement distance L measured by the two-dimensional laser displacement meter 15. The above also applies to FIGS. 5, 11, and 12 described later.

Here, if an annotation is described for the beam profile, the beam profile measured between the two-dimensional laser displacement meter 15 and the core metal 13 is reflected on the core metal 13 in the explanatory diagram shown in FIG. In order to mean a reflected image of the laser beam of the laser displacement meter 15, the beam profile has an upper semicircular shape toward the two-dimensional laser displacement meter 15. That is, the peak position of the semicircular beam profile is the closest point of the two-dimensional laser displacement meter 15.
However, in FIG. 4 and subsequent figures, for convenience of graph notation, the direction away from the two-dimensional laser displacement meter 15 is vertically inverted so as to be the positive direction of the Y axis, in other words, the upward direction of the Y axis. That is, it is described so that the peak point of the semicircular beam profile is the closest point of the two-dimensional laser displacement meter 15, that is, the lowest point in the same profile on the graph. This also applies to FIGS. 5, 11, and 12 described later.

  Such a beam profile 400 is repeatedly created at a predetermined sampling period. In this embodiment, the beam profile creation unit 102 takes a moving average of the beam profile 400 that is repeatedly created at a predetermined sampling period, and creates a beam profile at each sampling period. For example, when a predetermined sampling period is 1 [ms] and a moving average is taken every 5 [ms], a moving average of five beam profiles 400 is taken. Then, the value after the moving average is set as the beam profile at the earliest creation time among the creation times of the five beam profiles 400. In the following description, unless otherwise specified, when referred to as a beam profile, it is assumed to be a beam profile after this moving average.

[Peak position extraction unit 103]
As described above, since the optical cutting method is used in this embodiment, the distance between the two-dimensional laser displacement meter 15 and the cored bar 13 is derived from the peak position in the beam profile. Therefore, the peak position extraction unit 103 extracts the peak position from each of the beam profiles created by the beam profile creation unit 102. In the present embodiment, the peak position extraction unit 103 takes a moving average of (one) beam profile every 8 pixels, and extracts the position of the peak of the beam profile after the moving average. In the following description, unless otherwise specified, the term “beam profile peak” refers to a peak extracted in this manner.

FIG. 5 is a diagram conceptually showing an example of a beam profile and its peak.
Specifically, FIG. 5A shows beam profiles 501 and 502 when the change in the position of the shaft core of the core bar 13 before the start of drilling of the billet 20 and the position of the shaft core of the core bar 13 after the start of drilling are small. And the relationship between the peaks 501a and 502a. On the other hand, FIG. 5B shows the beam profiles 501 and 503 in the case where the change in the position of the shaft core of the core metal 13 before the drilling of the billet 20 and the position of the shaft core of the core metal 13 after the drilling start are large. It is a figure which shows the relationship and the relationship of the peaks 501a and 503a.

  If the shaft cores of the plug 12 and the cored bar 13 are not greatly deviated from the center of the end face on the top side of the billet 20 (that is, the pass line PL), the distance between the two-dimensional laser displacement meter 15 and the cored bar 13 is There is no significant deviation between before start and immediately after drilling. For this reason, as shown in FIG. 5A, the beam profiles 501 and 502 do not differ greatly before and after the start of drilling. Here, the beam profiles 501 and 502 are examples of beam profiles at a certain timing before the start of drilling and immediately after the start of drilling.

  On the other hand, as described above, in the present embodiment, the centering punch hole 21 for guiding the billet 20 to the center is formed at the center of the end face on the top side of the billet 20. Accordingly, when the drilling is started in a state where the shaft cores of the plug 12 and the core metal 13 are largely deviated from the center of the end face on the top side of the billet 20 (that is, the pass line PL), the plug 12 and the core metal 13 are , Guided in the direction of the centering punch hole 21. For this reason, as shown in FIG. 5B, the beam profiles 501 and 503 are greatly different before and after the start of drilling. Here, the beam profiles 501 and 503 are examples of beam profiles at a certain timing before the start of drilling and immediately after the start of drilling.

[Coordinate converter 104]
The coordinate conversion unit 104 determines the peak position in each of the horizontal direction (X-axis direction) and the vertical direction (Y-axis direction) based on the beam profile at the start of measurement and the peak position of each beam profile after the start of measurement. The distance difference is derived.
As described above, the measurement start time here is a timing at which the tip detection determination unit 101 determines that the end face on the top side of the billet 20 has been detected and a predetermined offset time OT has elapsed. In this measurement, the peak position before the start of drilling is obtained. In addition, since the measurement after the start here is a timing after the start of the measurement, the peak position before the start of drilling and the peak position after the start of drilling are acquired in the measurement at that time. .

  Here, the peak position in the measurement direction (Y / sin θ-axis direction) of the beam profile at the start of measurement is Y0. The peak position in the measurement direction (Y / sin θ-axis direction) of the beam profile after the start of measurement is Y ′. For example, in FIGS. 5A and 5B, assuming that the beam profile at the start of measurement is the beam profile 501, the position of the peak in the measurement direction (Y / sin θ-axis direction) of the beam profile at the start of measurement. Y0 is the value of the Y / sin θ axis of the peak 501a. The peak position Y ′ in the measurement direction (Y / sin θ-axis direction) of each beam profile after the start of measurement is the value of the Y / sin θ-axis of the peaks 502a and 503a.

  In the following description, the peak position of the beam profile at the start of measurement (peak position before the start of drilling) is referred to as a reference peak position as necessary. The peak position of each beam profile after the start of measurement is referred to as a measurement peak position as necessary.

  The coordinate conversion unit 104 derives a distance difference ΔY ′ from the measurement peak position Y ′ in the measurement direction (Y / sin θ axis direction) with respect to the reference peak position Y0 in the measurement direction (Y / sin θ axis direction) (ΔY ′ = Y0). -Y '). In the following description, this distance difference ΔY ′ is referred to as a Y-axis direction distance difference ΔY ′ as necessary. Then, the coordinate conversion unit 104 determines the vertical position of the measurement peak position in the vertical direction (Y-axis direction) based on the distance difference ΔY ′ in the Y-axis direction and the angle θ of the two-dimensional laser displacement meter 15 with respect to the pass line PL. A distance difference ΔY′_t with respect to the reference peak position in the direction (Y-axis direction) is derived.

FIG. 6 is a diagram for explaining an example of a method for deriving a distance difference ΔY′_t between a measurement peak position in the vertical direction (Y-axis direction) and a reference peak position in the vertical direction (Y-axis direction).
In FIG. 6, the peak position Y0 in the measurement direction (Y / sin θ-axis direction) of the beam profile at the start of measurement is the shortest distance between the two-dimensional laser displacement meter 15 and the surface 15a of the metal core 13 at the start of measurement. Become. The peak position Y ′ in the measurement direction (Y / sin θ-axis direction) of the beam profile after the start of measurement is the shortest distance between the two-dimensional laser displacement meter 15 and the surface 15b of the cored bar 13 after the start of measurement. .

As shown in FIG. 6, the distance difference ΔY′_t between the measurement peak position in the vertical direction (Y-axis direction) and the reference peak position in the vertical direction (Y-axis direction) is expressed by the following equation (1).
ΔY′_t = (Y0−Y ′) × sin θ (1)
Accordingly, the coordinate conversion unit 104 calculates the equation (1) to derive a distance difference ΔY′_t between the measurement peak position in the vertical direction (Y-axis direction) and the reference peak position in the vertical direction (Y-axis direction). To do.
In the present embodiment, the distance difference ΔY′_t between the measurement peak position in the vertical direction (Y-axis direction) and the reference peak position in the vertical direction (Y-axis direction) is the above-described vertical movement amount.

Further, the coordinate conversion unit 104 calculates the following equation (2) to derive a distance difference ΔX ′ between the measurement peak position in the X-axis direction and the reference peak position in the X-axis direction.
ΔX ′ = (X0−X ′) × αi (2)
In equation (2), X0 is a reference peak position in the X-axis direction, X ′ is a measurement peak position in the X-axis direction, and αi is a measurement resolution of the light receiving sensor of the two-dimensional laser displacement meter 15. .
In the present embodiment, the distance difference ΔX ′ between the measurement peak position in the X-axis direction and the reference peak position in the X-axis direction becomes the horizontal movement amount described above.

In the following description, the measurement resolution αi of the light receiving sensor of the two-dimensional laser displacement meter 15 is abbreviated as measurement resolution αi as necessary.
When the reference value of the measurement distance L is Ls, the measurement value of the measurement distance L is Lm, and the reference resolution is αs, the measurement resolution αi is calculated by the following equation (3).
αi = αs × Lm / Ls (3)
In this embodiment, as described above, the reference value Ls of the measurement distance L is 400 [mm], and the reference resolution αs is 0.3 [mm / pixel]. Further, the measurement value Lm of the measurement distance L is calculated by the following equation (4).
Lm = Y ′ (4)

[Determining unit 105]
The determination unit 105 determines whether the absolute value of the horizontal movement amount ΔX ′ derived by the coordinate conversion unit 104 exceeds a preset threshold value. Further, the determination unit 105 determines whether or not the absolute value of the vertical movement amount ΔY′_t derived by the coordinate conversion unit 104 exceeds a preset threshold value. Note that the threshold for the absolute value of the horizontal movement amount ΔX ′ and the threshold for the absolute value of the vertical movement amount ΔY′_t are individually set.

[Moving amount / moving direction calculation unit 106]
When the absolute value of the horizontal movement amount ΔX ′ or the absolute value of the vertical movement amount ΔY′_t exceeds a preset threshold value by the determination unit 105, the movement amount / movement direction calculation unit 106 Based on the horizontal direction movement amount ΔX ′ and the vertical direction movement amount ΔY′_t derived by the conversion unit 104, the deviation amount D due to the axial misalignment and the axial misalignment direction η are derived. In the present embodiment, the movement amount / movement direction calculation unit 106 derives the deviation amount D due to the misalignment of the shaft center by calculating the following equation (5). Further, the movement amount / movement direction calculation unit 105 derives the direction η of the axial misalignment by calculating the following equation (6).
D = {(ΔX ′) ² + (ΔY′_t) ² } ^1/2 (5)
η = tan ⁻¹ (ΔY′_t / ΔX ′) (6)

[Output unit 107]
The output unit 107 outputs the horizontal movement amount in the case where the absolute value of the horizontal movement amount ΔX ′ exceeds the threshold value and / or the absolute value of the vertical movement amount ΔY′_t exceeds the threshold value. ΔX ′, the vertical movement amount ΔY′_t, the horizontal movement amount ΔX ′, the shift amount D due to the axial misalignment derived from the vertical movement amount ΔY′_t, and the direction of the axial misalignment are output. Output to the device 200.

<Operation flowchart>
Next, an example of the operation of the axial misalignment calculation apparatus 100 of the present embodiment will be described with reference to the flowchart of FIG.
First, in step S <b> 701, the tip detection determination unit 101 stands by until the tip detector 16 detects the top side end surface (tip) of the billet 20. When the tip detector 16 detects the end surface (tip) on the top side of the billet 20, the process proceeds to step S702.

In step S702, the beam profile creation unit 102 waits until a predetermined offset time OT has elapsed. Then, when a predetermined offset time has elapsed, the process proceeds to step S703.
In step S703, the beam profile creating unit 102 creates a beam profile based on the measurement result of the two-dimensional laser displacement meter 15. As described above, the beam profile is repeatedly generated at a predetermined sampling period, and a moving average value at a predetermined time of the plurality of beam profiles generated in this manner becomes a final beam profile.

Next, in step S704, the peak position extraction unit 103 extracts the peak position of the beam profile created in step S703. As described above, the peak position extraction unit 103 extracts the peak position of the beam profile from the moving average value in a predetermined pixel of the beam profile.
Next, the process proceeds to step S705. In step S705, the peak position extraction unit 103 determines whether or not a predetermined measurement time MT has elapsed. As a result of the determination, if the predetermined measurement time MT has elapsed, the process proceeds to step S706. On the other hand, if the predetermined measurement time MT has not elapsed, the process returns to step S703 to create a beam profile and extract a peak position at the next timing. Then, the processes in steps S703 to S705 are repeated until a predetermined measurement time MT elapses.
Next, in step S706, the coordinate conversion unit 104 calculates the expression (1) to derive the vertical movement amount ΔY′_t, and calculates the expressions (2) and (3). Thus, the horizontal movement amount ΔX ′ is derived.

Next, in step S707, the determination unit 105 determines whether or not the absolute value of the horizontal movement amount ΔX ′ exceeds the threshold value and whether or not the absolute value of the vertical movement amount ΔY′_t exceeds the threshold value. As a result of this determination, if at least one of the absolute value of the horizontal movement amount ΔX ′ and the absolute value of the vertical movement amount ΔY′_t exceeds the threshold value, the process proceeds to step S708.
Next, in step S708, the movement amount / movement direction calculation unit 106 calculates the expression (5), thereby deriving the deviation amount D due to the axial misalignment and calculating the expression (6). Thus, the direction η of the axial misalignment is derived.
In step S709, the output unit 107 derives from the horizontal movement amount ΔX ′, the vertical movement amount ΔY′_t, the horizontal movement amount ΔX ′, and the vertical movement amount ΔY′_t. The deviation amount D due to the axial misalignment and the direction η of the axial misalignment are output to the output device 200. And the process by the flowchart of FIG. 7 is complete | finished.

On the other hand, if neither the absolute value of the horizontal movement amount ΔX ′ nor the absolute value of the vertical movement amount ΔY′_t exceeds the threshold value in step 707, the process proceeds to step S 709, according to the flowchart of FIG. The process ends.
Although different from the flow of FIG. 7, even if neither the absolute value of the horizontal movement amount ΔX ′ nor the absolute value of the vertical movement amount ΔY′_t exceeds the threshold value, steps S708 and S709 are performed. As described above, the horizontal movement amount ΔX ′, the vertical movement amount ΔY′_t, the deviation amount D due to the axial misalignment, and the axial misalignment direction η are output, as shown in FIG. You may make it complete | finish the process by a flowchart.

FIG. 8 is a diagram illustrating an example of the vertical movement amount 801 and the horizontal movement amount 802 derived by the axial misalignment calculation apparatus 100 of the present embodiment. As described above, in the present embodiment, the predetermined measurement time MT is determined from the range of 0.01 [s] or more and 0.5 [s] or less. However, in FIG. The results of deriving the vertical movement amount 801 and the horizontal movement amount 802 over a long period of time are shown. In the example shown in FIG. 8, at time t, the vertical movement amount 801 is about 2 [mm] and the horizontal movement amount 802 is about 1 [mm], which exceed the threshold values. Therefore, it can be determined that perforation has started at time t.
In the axial misalignment calculation apparatus 100 of the present embodiment, since the deviation amount exceeding the threshold value is finally derived (S708, S709), after time t in FIG. 8 (depending on the setting of the threshold value). As a result, it becomes possible to grasp the moving direction and amount of the core bar 13 or the pass line for correcting the deviation.

<Summary>
As described above, according to the present embodiment, based on the result of measurement by the two-dimensional laser displacement meter 15, the shift amount (horizontal movement amount ΔX ′) of the metal core 13 due to the axial misalignment in the horizontal direction (X-axis direction) and The deviation amount (vertical movement amount ΔY′_t) of the metal core 13 due to the axial misalignment in the vertical direction (Y-axis direction) is derived. Therefore, it is possible to measure the deviation of the cored bar 13 in both the horizontal direction (X-axis direction) and the vertical direction (Y-axis direction). Accordingly, if the eccentricity of the billet 20 is caused by how much the shaft core of the cored bar 13 is moved in any direction, excluding the heat of the billet 20 and the swinging of the cored bar 13 due to the backlash generated in the piercer mill. When only the axial misalignment between the core bar 13 and the billet 20 is extracted and the axis core of the core bar 13 and the pass line 20 are displaced, in which direction the axis of the core bar 13 or the pass line is moved. It can be specified online whether the eccentric thickness deviation of the billet 20 is reduced.

FIG. 9 is a diagram conceptually showing an example of the amount of swing of the billet 20 before and after the adjustment of the axis of the core bar 13. Specifically, FIG. 9A shows the case of the method of the present embodiment, and FIG. 9B shows the case of the conventional method (described in Patent Documents 2 to 4).
As shown in FIG. 9A, in the present embodiment, since the horizontal direction movement amount ΔX ′ and the vertical direction movement amount ΔY′_t are derived, the deviation amount D due to the axial misalignment, the axial misalignment direction η, (A solid arrow line 902 in FIG. 9A represents the shift amount D due to the axial misalignment and the direction η of the axial misalignment). Therefore, the position of the shaft core of the core metal 13 may be adjusted so as to cancel this (the broken arrow line 901 in FIG. 9A indicates the adjustment amount and the adjustment direction of the position of the shaft core of the core metal 13). Represents). By adjusting the position of the shaft core of the core bar 13 in this way, the swing of the billet 20 can be suppressed from a solid-line ellipse 903 to a broken-line ellipse 904.

  On the other hand, as shown in FIG. 9B, in the conventional method, it is derived only by the amount of vibration around the shell or the cored bar 13. Therefore, as shown by the arrow line in FIG. 9B, this direction is the direction around the runout of the core bar 13 or the shell, and the core misalignment between the core bar and the pass line does not necessarily match. In other words, adjusting the metal core or the pass line in this direction does not correct the shaft misalignment.

Further, as shown in FIG. 9 (b), in the conventional method, is this measured value indicating the amount of run-out of the cored bar 13 or the shell due to a deviation between the axis of the cored bar 13 and the pass line PL? It is not possible to specify whether this is another factor as described above.
On the other hand, the present inventors have found that the displacement between the metal core 13 and the shaft core of the billet 20 has a correlation with the displacement amount and direction when the plug 12 comes into contact with the billet 20 for the first time. I found it. Therefore, in the present embodiment, the horizontal movement amount ΔX ′ and the vertical movement amount ΔY′_t are derived based on the measurement result of the two-dimensional laser displacement meter 15 at the predetermined measurement time MT. For example, when the temperature distribution of the end face on the top side of the billet 20 is uneven or when the punching machine 10 has a backlash, the axial misalignment due to the influence is somewhat after the start of drilling. Occurs after the time elapses. Therefore, by measuring the tip portion (top side) of the core bar 13, it is possible to capture a minute amount of movement from immediately before the start of drilling to immediately after, and the amount of movement when the temperature distribution is biased, Deriving the horizontal movement amount ΔX ′ and the vertical movement amount ΔY′_t based on the measurement result of the two-dimensional laser displacement meter 15 until the time when the movement amount due to the play generated in the punching machine 10 occurs is reached. Accordingly, it is possible to extract as much as possible the deviation between the axis of the core 13 and the pass line PL, and to grasp the amount and direction of the axis misalignment.

In addition, with a simple configuration using a single two-dimensional laser displacement meter 15, the amount of misalignment of the core 13 due to misalignment in the two directions (X-axis direction and Y-axis direction) can be detected online at high speed and with high accuracy. can do.
Therefore, the adjustment direction and the adjustment amount of the cored bar 13 when the axial misalignment occurs are clarified, and the swinging of the shell can be suppressed accurately and quickly.
Moreover, since there is no restriction | limiting of the installation position in the circumferential direction of the metal core 13 of the two-dimensional laser displacement meter 15, it can suppress that the two-dimensional laser displacement meter 15 and an installation interfere.

<Modification>
It is preferable to use one two-dimensional laser displacement meter 15 as in this embodiment because the configuration is simplified and interference with equipment can be easily suppressed. However, the number of two-dimensional laser displacement meters is not limited to one. For example, a sensor that optically measures the displacement in the horizontal direction (X-axis direction) of the cored bar 13 and a sensor that optically measures the displacement in the vertical direction (Y-axis direction) of the cored bar 13 are separately provided. Also good. The direction in which the displacement of the core bar 13 is measured is not limited to the horizontal direction (X-axis direction) and the vertical direction (Y-axis direction), and may be any direction as long as they are two different directions. . In addition, a three-dimensional sensor may be used instead of the two-dimensional sensor.

  Further, in the present embodiment, the case where the horizontal direction movement amount and the vertical direction movement amount are derived has been described as an example. However, the direction of deriving the amount of deviation of the cored bar 13 is not limited to the horizontal direction (X-axis direction) and the vertical direction (Y-axis direction), but in two different directions perpendicular to the axis of the cored bar 13. Any direction is acceptable.

  Further, in the present embodiment, a case where the horizontal direction movement amount ΔX ′, the vertical direction movement amount ΔY′_t, the deviation amount D due to the axial misalignment, and the axial misalignment direction η are output will be described as an example. did. However, this is not always necessary. For example, from the horizontal direction movement amount ΔX ′ and the vertical direction movement amount ΔY′_t, the axial misalignment direction η and the shift amount D due to the axial misalignment can be obtained. Therefore, when outputting the horizontal direction movement amount ΔX ′ and the vertical direction movement amount ΔY′_t, it is not necessary to output at least one of the axial center shift direction η and the shift amount D due to the shaft center shift. Further, a horizontal movement amount ΔX ′ and a vertical movement amount ΔY′_t are obtained from the deviation amount D due to the axial misalignment and the direction η of the axial misalignment. Therefore, when outputting the shift amount D due to the shaft misalignment and the direction η of the shaft misalignment, the horizontal movement amount ΔX ′ and the vertical movement amount ΔY′_t may not be output. That is, it is only necessary to output information for specifying the shift amount D due to the shaft misalignment and the direction η of the shaft misalignment. Further, these pieces of information may be output regardless of whether or not at least one of the absolute value of the horizontal movement amount ΔX ′ and the absolute value of the vertical movement amount ΔY′_t exceeds a threshold value.

  In the present embodiment, after it is determined that at least one of the absolute value of the horizontal movement amount ΔX ′ and the absolute value of the vertical movement amount ΔY′_t exceeds the threshold value, the horizontal movement amount ΔX is determined. The case where the deviation amount D due to the axial misalignment and the direction η of the axial misalignment are derived from 'and the vertical movement amount ΔY'_t has been described as an example. However, this is not always necessary. For example, following the derivation of the horizontal direction movement amount ΔX ′ and the vertical direction movement amount ΔY′_t, the deviation amount D due to the axial misalignment and the axial misalignment direction η may be derived.

  In the present embodiment, the case where it is determined whether or not the absolute value of the horizontal movement amount ΔX ′ and the absolute value of the horizontal movement amount ΔX ′ exceed a threshold value has been described as an example. However, this is not always necessary. For example, instead of or in addition to this, it may be determined whether or not the deviation amount D due to axial misalignment exceeds a threshold value.

  Further, in the present embodiment, as shown in the equation (6), the case where the axis misalignment direction η is represented by an angle from the horizontal direction (X-axis direction) has been described as an example. However, as long as the information indicates the direction of the axial misalignment, it is not always necessary to derive the direction of the axial misalignment by the expression (6).

  In the present embodiment, the case where the predetermined offset time OT is provided has been described as an example, but the predetermined offset time OT may not be provided.

(Second Embodiment)
Next, a second embodiment will be described. In the first embodiment, the case where the two-dimensional laser displacement meter 15 is arranged so that the angle φ with respect to the horizontal direction (X-axis direction) is 90 [°] has been described as an example. On the other hand, in this embodiment, the case where the angle φ with respect to the horizontal direction (X-axis direction) of the two-dimensional laser displacement meter 15 is an angle other than 90 [°] will be described. Thus, the present embodiment and the first embodiment are mainly different in configuration and part of processing due to the different arrangement of the two-dimensional laser displacement meter 15. Therefore, in the description of the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals as those in FIGS.

  FIG. 10 is a diagram illustrating an example of a configuration of the piercer mill axis measurement system. Specifically, FIG. 10A is a diagram illustrating an example of the overall configuration of the piercer mill axis measurement system, and corresponds to FIG. FIG. 10B shows an example of the positional relationship between the metal core 13 and the two-dimensional laser displacement meter 15 when viewed from the direction along the pass line PL (the direction of the white arrow line shown in FIG. 10A). It is a figure shown, and it is a figure corresponding to FIG.1 (b).

  As is apparent from a comparison between FIG. 1B and FIG. 10B, in the present embodiment, the two-dimensional laser displacement meter 15 has an angle of 45 [°] as the angle φ with respect to the horizontal direction (X-axis direction). Installed and installed. Other configurations of the piercer mill shaft measuring system of the present embodiment are the same as those of the first embodiment.

FIG. 11 is a diagram conceptually illustrating an example of the beam profile 1100. When the X axis and the Y / sin θ axis are determined as shown in FIG. 4 described in the first embodiment, the beam profile 1100 is created in the direction shown in FIG.
FIG. 12 is a diagram conceptually illustrating an example of a beam profile and its peak. Specifically, FIG. 12A shows beam profiles 1201 and 1202 when the change in the position of the shaft core of the core bar 13 before the start of drilling of the billet 20 and the position of the shaft core of the core bar 13 after the start of drilling are small. And peaks 1201a and 1202a, corresponding to FIG. 5 (a). On the other hand, FIG. 12B shows beam profiles 1201 and 1203 when the position of the shaft core of the core bar 13 before the drilling of the billet 20 and the position of the shaft core of the core bar 13 after the drilling start are large. FIG. 6 is a diagram showing the peaks 1201a and 1203a and corresponding to FIG. 5 (b).

  In the first embodiment, the distance difference ΔY′_t between the measurement peak position in the vertical direction (Y-axis direction) and the reference peak position in the vertical direction (Y-axis direction) calculated by the expression (1) is moved in the vertical direction. It becomes quantity. Further, the distance difference ΔX ′ between the measured peak position in the X-axis direction and the reference peak position in the X-axis direction calculated by the expressions (2) and (3) is the horizontal movement amount.

On the other hand, in the present embodiment, the vertical movement amount ΔYY is calculated by the following equation (7), and the horizontal movement amount ΔXX is calculated by the following equation (8).
ΔYY = ΔY′_t × cos φ−ΔX ′ × sin φ (7)
ΔXX = ΔY′_t × sin φ + ΔX ′ × cos φ (8)

  Therefore, the movement amount / movement direction calculation unit 105 derives the vertical movement amount ΔYY by calculating the equation (7), and derives the horizontal movement amount ΔXX by calculating the equation (8). To do.

Then, the moving amount / moving direction calculation unit 105 calculates the deviation amount D due to the misalignment of the axis by performing the following equations (9) and (10) instead of the equations (5) and (6). And the direction η of the axial misalignment is derived.
D = {(ΔXX) ² + (ΔYY) ² } ^1/2 (9)
η = tan ⁻¹ (ΔYY / ΔXX) (10)

As described above, even when the angle φ with respect to the horizontal direction (X-axis direction) of the two-dimensional laser displacement meter 15 is an angle other than 90 [°], the same effects as those of the first embodiment described above can be obtained. it can. Further, by adjusting the angle φ with respect to the horizontal direction (X-axis direction) of the two-dimensional laser displacement meter 15, it is possible to suppress interference between the two-dimensional laser displacement meter 15 and the equipment.
Also in the present embodiment, various modifications described in the first embodiment can be employed.

(Other embodiments)
The embodiment of the present invention described above can be realized by a computer executing a program. Further, a computer-readable recording medium in which the program is recorded and a computer program product such as the program can also be applied as an embodiment of the present invention. As the recording medium, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.
In addition, the embodiments of the present invention described above are merely examples of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed as being limited thereto. Is. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.

(Relationship with claims)
Below, an example of the relationship between a claim and embodiment is shown. Note that the present invention is not limited to the above-described embodiment, as described in the modification and the like.
<Claims 1, 5, 12, 13>
The plug is realized by using the plug 12, for example.
The cored bar is realized, for example, by using the cored bar 13.
The material is realized by using, for example, the billet 20.
The inclined roll is realized, for example, by using inclined rolls 11a and 11b.
The measuring means is realized by using a two-dimensional laser displacement meter 15, for example.
At least two different directions are realized by using, for example, the X-axis direction and the Y / sin θ-axis direction (measurement direction).
The first derivation means is realized by using, for example, the beam profile creation unit 102, the peak position extraction unit 103, and the coordinate conversion unit 104.
Two different directions perpendicular to the longitudinal axis of the cored bar are realized by using, for example, the X-axis direction and the Y-axis direction.
The amount of movement of the mandrel is, for example, the distance difference ΔX ′ from the measurement peak position in the X-axis direction to the reference peak position in the X-axis direction and the vertical direction (Y-axis of the measurement peak position in the vertical direction (Y-axis direction)) This is realized by the distance difference ΔY′_t with respect to the reference peak position in the direction).
<Claims 2 and 3>
A detection means is implement | achieved by using the front-end | tip detector 16, for example.
<Claim 4>
Prior to the start of drilling, for example, the tip detection determination unit 101 determines that the end surface on the top side of the billet 20 has been detected, and after the predetermined offset time OT has elapsed, the end surface on the top side of the billet 20 is the tip of the plug 12. It is realized by the timing until it touches. After the start of drilling, it is realized at a timing after the top end surface of the billet 20 contacts the tip of the plug 12 (more preferably, immediately after contact).
<Claim 6>
The amount of movement of the metal core in the second measurement direction is realized by, for example, a distance difference ΔY ′ in the Y-axis direction. Further, the angle of the measuring means with respect to the pass line is realized by an angle θ, for example. Further, the movement amount of the metal core in the second movement amount derivation direction is the distance difference ΔY′_t () between the measurement peak position in the vertical direction (Y-axis direction) and the reference peak position in the vertical direction (Y-axis direction). (Equation (1))
<Claim 7>
The angle of the measuring means with respect to the horizontal direction perpendicular to the longitudinal axis of the cored bar is realized, for example, by an angle φ (see also equation (7)).
<Claim 8>
The position of the metal core in the first measurement direction measured by the measurement means at different timings before and after the start of drilling is, for example, a measurement result (beam profile) of the two-dimensional laser displacement meter 15 The measurement peak position X ′ in the X-axis direction obtained based on
The reference resolution, which is a distance in the real space per one pixel, is realized by the reference resolution αs, for example.
The reference distance between the measurement means and the cored bar in the second measurement direction is realized by, for example, a reference value Ls of the measurement distance L (400 [mm] in the example of the present embodiment).
The measurement distance between the measurement means and the metal core in the second measurement direction determined based on the position of the metal core in the second measurement direction measured by the measurement means is a measured value of the measurement distance L. This is realized by Lm (Equation (4)).
The movement amount of the metal core in the first movement amount derivation direction is realized by, for example, a distance difference ΔX ′ (equation (2)) between the measurement peak position in the X-axis direction and the reference peak position in the X-axis direction. .
<Claim 9>
The angle of the measuring means with respect to the horizontal direction perpendicular to the longitudinal axis of the cored bar is realized, for example, by an angle φ (see also equation (8)).
<Claim 10>
The total movement amount of the shaft center is realized by, for example, a shift amount D (equation (5)) due to a shaft center shift.
The moving direction of the shaft center is realized by, for example, the shaft misalignment direction η (equation (6)).
The second derivation means is realized by using the movement amount / movement direction calculation unit 105, for example.
<Claim 11>
The determination unit is realized by using the determination unit 106, for example.
An output means is implement | achieved by using the output part 107 and the output device 200, for example.

  10: punching machine, 11a to 11b: inclined roll, 12: plug, 13: cored bar, 14: guide, 15: two-dimensional laser displacement meter, 16: tip detector, 100: axial misalignment calculation device, 200: output Apparatus: 101: tip detection determination unit, 102: beam profile creation unit, 103: peak position extraction unit, 104: coordinate conversion unit, 105: determination unit, 106: movement amount / movement direction calculation unit, 107: output unit

Claims (15)

A plug that is pushed into the material to produce a hollow shell, and a cored bar that is arranged so as to be coaxial with the plug at the end of the plug in the longitudinal direction that does not face the material, An axis core of the core bar in a piercer mill having an inclined roll for rotating the material about its longitudinal axis as a rotation axis and a holding roll arranged in the axial direction for holding the core bar; A piercer mill axis measurement system that derives a deviation from a pass line,
Measuring means disposed on the exit side of the piercer mill, wherein the measuring means optically measures the position of the core metal in at least two different directions;
Based on the position of the core bar measured at different timings before and after the start of drilling by the measuring means, the amount of movement of the core bar is mutually perpendicular to the longitudinal axis of the core bar. First deriving means for deriving in each of two different directions;
A piercer mill shaft measuring system. Of the end faces in the longitudinal direction of the material, further comprising a detecting means for detecting the end face facing the plug,
The first derivation unit is configured to detect the end surface facing the plug among the end surfaces in the longitudinal direction of the material, or after a predetermined offset time has elapsed from the timing. , Based on the position of the core metal measured by the measuring means at different timings before and after the start of drilling within a predetermined measurement time, the movement amount of the core metal is determined in the longitudinal direction of the core metal 2. The piercer mill axis measuring system according to claim 1, wherein the piercer mill axis measuring system is derived in each of two different directions perpendicular to the axis of the axis.   The piercer mill axis measurement system according to claim 2, wherein the predetermined measurement time is 0.01 [s] or more and 0.5 [s] or less.   The first derivation unit is configured to perform the drilling based on the position of the cored bar measured before the drilling is started by the measuring unit and the position of the cored bar measured after the drilling is started by the measuring unit. The amount of movement of the cored bar at each timing after the start is derived in each of two different directions perpendicular to the longitudinal axis of the cored bar. 2. The piercer mill axis measurement system according to item 1. The two directions which are measurement directions by the measurement means are a first measurement direction which is a horizontal direction perpendicular to the longitudinal axis of the core bar and a second measurement direction which is a visual field direction of the measurement means. Yes,
The two directions which are the derivation directions of the movement amount of the core metal are the first movement amount derivation direction which is a horizontal direction perpendicular to the longitudinal axis of the core metal and the second movement amount which is a vertical direction. The piercer mill axis measurement system according to any one of claims 1 to 4, wherein the piercing direction is a derivation direction.   The first deriving unit is configured to measure in the second measurement direction from the position of the cored bar in the second measurement direction, measured by the measurement unit at different timings before and after the start of drilling. Deriving the amount of movement of the cored bar, and using the derived amount of movement of the cored bar in the second measuring direction and the angle of the measuring means with respect to the pass line, the second moving amount derivation direction The piercer mill shaft measurement system according to claim 5, wherein a movement amount of the mandrel is derived.   The first deriving unit derives the movement amount of the core bar in the second movement amount deriving direction by further using the angle of the measuring unit with respect to a horizontal direction perpendicular to the longitudinal axis of the core bar. The piercer mill axis measurement system according to claim 6 characterized by things. The measurement means has a plurality of pixels arranged along the first measurement direction,
The first deriving unit is configured to measure the position of the mandrel in the first measurement direction and the actual per pixel measured by the measuring unit at different timings before and after the start of drilling. A reference resolution which is a distance in space, a reference distance between the measuring means and the cored bar in the second measuring direction, and a position of the cored bar in the second measuring direction measured by the measuring means The movement amount of the metal core in the first movement amount deriving direction is derived using the measurement distance between the measurement means and the metal core in the second measurement direction determined based on The piercer mill axis measurement system according to any one of claims 5 to 7.   The first derivation means derives the movement amount of the core metal in the first movement amount derivation direction by further using the angle of the measurement means with respect to a horizontal direction perpendicular to the longitudinal axis of the core metal. The piercer mill shaft measuring system according to claim 8.   Based on the movement amount of the metal core in two different directions perpendicular to the longitudinal axis of the metal core, derived by the first derivation means, The piercer mill shaft measurement system according to any one of claims 1 to 9, further comprising second derivation means for deriving a moving direction of the cored bar. At least one of the absolute values of the movement amount of the core metal in two different directions perpendicular to the longitudinal axis of the core metal, and the total movement of the core metal derived from these movement amounts Determining means for determining whether at least one of the absolute value of the quantity exceeds a threshold value;
By the determination means, at least one of absolute values of the movement amount of the core metal in two different directions perpendicular to the longitudinal axis of the core metal, and the absolute value of the total movement amount of the core metal Output means for outputting information for specifying a total movement amount of the core metal and a movement direction of the core metal when it is determined that at least any one of the values exceeds a threshold value; The piercer mill axis measurement system according to claim 1, wherein the piercer mill axis measurement system is provided.   The piercer mill axis measurement system according to any one of claims 1 to 11, wherein the measuring means is configured by a single device.   The piercer mill axis measurement according to any one of claims 1 to 12, wherein a concave portion is formed in a central portion of an end surface facing the plug among end surfaces in a longitudinal direction of the material. system. A plug that is pushed into the material to produce a hollow shell, and a cored bar that is arranged so as to be coaxial with the plug at the end of the plug in the longitudinal direction that does not face the material, A shaft core of the core bar in a piercer mill having an inclined roll for rotating the material about its longitudinal axis as a rotation axis and a holding roll disposed in the axial direction for holding the core bar A piercer mill axis measurement method for deriving the deviation between the pass line and
Measuring means arranged on the exit side of the piercer mill, wherein the measuring step optically measures the position of the metal core in at least two different directions;
Based on the position of the cored bar measured at different timings before and after the start of drilling by the measurement step, the amount of movement of the cored bar is mutually perpendicular to the longitudinal axis of the cored bar. A derivation step for deriving in each of two different directions;
A piercer mill shaft measuring method characterized by comprising: A plug that is pushed into the material to produce a hollow shell, and a cored bar that is arranged so as to be coaxial with the plug at the end of the plug in the longitudinal direction that does not face the material, A shaft core of the core bar in a piercer mill having an inclined roll for rotating the material about its longitudinal axis as a rotation axis and a holding roll disposed in the axial direction for holding the core bar A program for causing a computer to derive a deviation between a path line and
Measuring means disposed on the exit side of the piercer mill, wherein the measuring means optically measures the position of the core metal in at least two different directions at different timings before and after the start of drilling. Causing the computer to execute a derivation step for deriving the amount of movement of the metal core in each of two mutually different directions perpendicular to the longitudinal axis of the metal core based on the measured position of the metal core. A program characterized by

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