KR20150048279A - Cutting Apparatus And Method for Steel Rod - Google Patents

Abstract

Disclosed is a bar-cutting apparatus and a bar-cutting method for cutting a bar using a cutting wheel. Disclosed is a bar cutting apparatus comprising: a cutting wheel rotatably installed on a device body for cutting a bar; A thermal image measuring unit for collecting, in real time, image data of a red-hot portion of the cutting wheel when the bar is cut by the cutting wheel; And a control unit for calculating a diameter of the cutting wheel from the image data collected by the thermal image measuring unit and controlling at least one of driving and replacing the cutting wheel according to the diameter of the cutting wheel. Also, the disclosed bar cutting method includes: a bar fixing step of fixing a bar steel to a bar strength fixing portion corresponding to a cutting position of a bar; And a bar cutting step of cutting the bar steel by rotationally driving the cutting wheel, wherein the bar cutting step includes a step of cutting the bar from the image data of the thermal image measuring unit that senses the red- And to control at least one of the drive and replacement timings of the cutting wheels.

Description

TECHNICAL FIELD [0001] The present invention relates to a cutting apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bar-cutting apparatus and a bar-cutting method for cutting a bar using a cutting wheel.

A grinding wheel sawing machine is used in which a bar is cut without using cooling water and lubricating oil in a short time by using a grinding wheel that rotates at a high speed in order to cut a bar of a large diameter. The bar cutting apparatus of this type can perform the cutting operation of the bar without further rework or supplementation of the section using the feature of the high speed cutting method.

Thus, the cutting wheel plays an important role in the bar cutting apparatus using the cutting wheel. Such a cutting wheel is a component that rotates at high speed (for example, 1500 rpm or more) and wears continuously due to friction with the bar steel, resulting in a shortened service life.

Therefore, it is necessary to measure and manage the degree of wear of the cutting wheel in order to safely operate without interference of the diameter of the cutting wheel in consideration of the diameter of the bar to be cut and the clamping structure of the device, In case of life judgment, the device should be stopped and the cutting wheel replaced. However, since there is no means for precisely measuring the wear rate of such a cutting wheel during a conventional bar cutting operation, it is possible to replace the cutting wheel with a remaining life time at a constant cycle, thereby wasting expensive cutting wheels, There is a problem that is interrupted.

Fig. 1 schematically shows a configuration of a conventional bar-cutting device 10.

1, the conventional bar cutting device 10 is configured such that the cutting wheel 11 is coupled to the power transmitting portion 13 through the wheel fixing portion 12 and rotates at a high speed to the bar WR It is pressed while applying pressure. The force F generated at this time can be divided into a downward force in the direct downward direction and a lateral force for continuously contacting the cutting wheel 11 with the bar WR. As shown in Fig. 1 (b) (WR) generates a reaction force in the opposite direction with respect to each force.

In this case, as shown in Fig. 2, the device body and the power transmitting portion 13 connecting the device body and the cutting wheel 11 are subjected to a large amount of vibration due to continuous friction between the cutting wheel 11 and the bar WR .

This vibration causes the vibration of the arm structure, that is, the entire power transmitting portion 13, which transmits the driving force by fixing the cutting wheel 11. The work wear limit line LD 'of the cutting wheel 11 must be used as the cutting edge of the cutting wheel 11 because the vibration is generated randomly and must be used in addition to the wear limit line LD of the cutting wheel 11 itself, 11) itself must be set higher than the wear limit line (LD).

This problem not only reduces the service life of the cutting wheel 11 but also shortens the replacement cycle of the expensive cutting wheel 11 as well as the number of times the cutting operation of the bar WR is interrupted for the replacement of the cutting wheel 11 And the process cost is increased.

Further, in the conventional bar-cutting device 10, a large impact is generated in the cutting wheel 11 due to an instantaneous increase in frictional force at the moment when the barrel 11 and the bar WR come into contact with each other at the beginning of cutting, Which causes cracking and breakage of the cutting wheel 11.

SUMMARY OF THE INVENTION The present invention has been made to solve at least some of the problems of the prior art as described above, and it is an object of the present invention to provide a bar and bar cutting device and a bar cutting method capable of confirming the degree of abrasion of a cutting wheel during a bar cutting operation.

Another aspect of the present invention is to provide a bar-cutting device and a bar-cutting method that can maximize the wear limit of a cutting wheel to increase the service life of the cutting wheel.

It is another object of the present invention to provide a bar-cutting device and a bar-bar cutting method capable of minimizing vibration during cutting work of a bar.

The present invention also provides, as one aspect, a bar-cutting device and a bar-cutting method capable of stable cutting operation.

The present invention is, as one aspect, to provide a bar and bar cutting apparatus and bar bar cutting method capable of increasing the straightness of a cut surface.

According to an aspect of the present invention, there is provided a cutting machine comprising: a cutting wheel rotatably mounted on a device body for cutting a bar; A thermal image measuring unit for collecting, in real time, image data of a red-hot portion of the cutting wheel when the bar is cut by the cutting wheel; And a control unit for calculating a diameter of the cutting wheel from the image data collected by the thermal image measuring unit and controlling at least one of driving and replacing the cutting wheel according to the diameter of the cutting wheel, Lt; / RTI >

At this time, the thermal image measuring unit may be configured to measure the infrared region of the cutting wheel surface.

The control unit may be configured to determine that there is an abnormality in the cutting wheel and to control the driving of the cutting wheel when there is a part having a temperature higher than the set value in the inner area of the cutting wheel.

The control unit compares the diameter of the cutting wheel, which is expected upon completion of the operation of the trailing bar, with the wear amount limit before the cutting operation of the trailing bar is performed after the cutting operation of the preceding bar steel is completed, . ≪ / RTI >

In another aspect of the present invention, the apparatus for cutting a bar may further include a laser sensor for measuring a diameter of the cutting wheel in real time. At this time, the laser sensor may include a transmission type laser sensor. The controller may be configured to calculate the diameter of the cutting wheel in real time based on the data measured by the thermal imager and the laser sensor.

According to another aspect of the present invention, there is provided an apparatus for cutting a bar, the cutting wheel including a cutting wheel feeding part for feeding the cutting wheel to a bar side for cutting a bar; And a vibration sensor for measuring vibration due to the driving of the cutting wheel. The control unit may be configured to control the driving of the cutting wheel based on the vibration value measured by the vibration sensor. For example, when the cutting wheel is moved close to the bar by the cutting wheel feeder, the control unit is configured to increase the pressing force of the cutting wheel when the cutting wheel is detected to be in contact with the bar steel through the vibration sensor . In addition, the controller may be configured to reduce the vibration by adjusting the pressing force of the cutting wheel when the vibration value measured by the vibration sensor exceeds the set value.

According to another aspect of the present invention, there is provided an apparatus for cutting a bar, comprising: a cutting wheel rotating unit for rotating the cutting wheel; And a current sensor for measuring a current value applied to the cutting wheel rotation unit, wherein the control unit controls the driving of the cutting wheel based on the current value measured by the current sensor during the bar cutting operation . For example, the controller may lower the feed speed of the cutting wheel feeder when the current value measured by the current sensor increases, and increase the feed speed of the cut wheel feeder when the current value measured by the current sensor decreases. .

Further, the bar-cutting device according to an aspect of the present invention may further include a bar-like fixing portion for fixing the bar-bar to be cut, wherein the bar-bar fixing portion is provided on both sides of the bar- Clamping means provided vertically movably so as to clamp the bars in both the upper and lower directions from both sides of the cutting wheel; and clamping means provided vertically movably so as to additionally support the bar steel supported by the fixing rolls from the lower side And a lifting support roll may be provided.

According to another aspect of the present invention, there is provided a bar-fixing method comprising: a bar-fixing step of fixing a bar to a bar-fixing portion so as to correspond to a cutting position of the bar; And a bar cutting step of cutting the bar steel by rotationally driving the cutting wheel, wherein the bar cutting step includes a step of cutting the bar from the image data of the thermal image measuring unit that senses the red- And controlling at least one of the driving and replacement timing of the cutting wheel.

At this time, the bar cutting step is configured to control at least one of driving and replacing time of the cutting wheel according to the diameter of the cutting wheel measured from the laser sensor and the diameter of the cutting wheel calculated from the image data of the thermal image measuring unit .

The method further includes the step of comparing the diameter of the cutting wheel, which is expected upon completion of the cutting operation of the trailing bar after completion of the cutting step, with the wear amount to determine whether the cutting wheel needs to be replaced .

The bar-cutting step may be configured to increase the pressing force of the cutting wheel when it is detected that the cutting wheel is in contact with the bar, based on the vibration value measured by the vibration sensor.

Also, the bar cutting step may be configured to control the feed speed of the cutting wheel feeding part for feeding the cutting wheel in inverse proportion to a current value applied to the cutting wheel rotating part for rotating the cutting wheel.

According to an embodiment of the present invention having such a configuration, a change in real time diameter of a cutting wheel can be precisely calculated during a cutting operation through a thermal image measuring unit. In addition, according to an embodiment of the present invention, when the thermal image measuring unit and the laser sensor are used together, the diameter value can be stably measured even if noise is generated in the thermal image measuring unit. Therefore, it is possible not only to perform cutting operation corresponding to the reduction in the diameter of the cutting wheel during the bar cutting operation, but also to accurately measure whether or not the wear limit is reached in the cutting operation.

In particular, when a thermal image measuring unit is used, it is possible to prevent a safety accident due to cracking or breakage of a cutting wheel by detecting occurrence of excessive heat in an inner area of the cutting wheel.

Further, according to the embodiment of the present invention, the amount of wear of the cutting wheel required for cutting the succeeding bar steel after the cutting operation of the preceding bar steel is completed is predicted in advance, and it is predicted that the cutting wheel reaches the wear limit during the bar steel working It is possible to maximize the service life of the cutting wheel.

According to an embodiment of the present invention, the moment when the cutting wheel that rotates at high speed through the vibration sensor touches the bar is detected, and the pressing force of the cutting wheel is gradually increased, It is possible to reduce the vibration and to prevent cracking and breakage of the cutting wheel.

According to an embodiment of the present invention, the current value applied to the cutting wheel rotating unit is measured and the cutting speed (feeding speed of the cutting wheel) is adjusted in inverse proportion to the current value, thereby minimizing vibration and realizing a stable cutting operation .

According to an embodiment of the present invention, since the wear limit can be maximized through the measurement of the vibration amount through the vibration sensor and the measurement of the diameter reduction of the cutting wheel through the thermal image measuring unit and / or the laser sensor, Thereby reducing the number of cutting wheel replacements and thereby reducing the processing cost.

Further, according to the embodiment of the present invention, it is possible to increase the straightness of the cut surface by making it possible to securely support the bar, which is the object to be cut, through the bar strength fixing portion.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view schematically showing a conventional bar steel cutting apparatus, wherein (a) is a perspective view and (b) is an explanatory view showing a direction of a force. Fig.
Fig. 2 is a schematic view showing the abrasion limit according to vibration of a conventional bar cutting device. Fig.
3 is a front schematic view of a bar steel cutting apparatus according to an embodiment of the present invention.
Fig. 4 is a schematic view showing a state in which the bar steel is cut using the bar cutting apparatus shown in Fig. 3; Fig.
FIG. 5 is a side schematic view showing an example of a bar strength fixing unit provided in a bar strength cutting apparatus according to the present invention. FIG.
FIG. 6 is a flowchart illustrating a bar-cutting method according to an embodiment of the present invention. FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. The shape and size of elements in the drawings may be exaggerated for clarity.

Furthermore, the singular forms "a", "an," and "the" include plural referents unless the context clearly dictates otherwise.

3 to 5, a bar steel cutting apparatus 100 according to an embodiment of the present invention will be described.

3, the bar cutting apparatus 100 according to an embodiment of the present invention includes a cutting wheel 120, a thermal image measuring unit 130 for measuring the diameter of the cutting wheel 120, And a controller (C) for controlling at least one of driving and replacing the cutting wheel (120), and further comprising a laser sensor (140) for measuring the diameter of the cutting wheel (120) A cutting wheel transfer unit 180 for transferring the cutting wheel 120 to the bar WR side, a cutting wheel rotation unit 160 for rotating the cutting wheel 120, a vibration sensor 150 for measuring vibration, A current sensor 170 for measuring the current value applied to the rotation unit 160 and at least a part of the bar strength fixing unit 190 for fixing the bar WR during the cutting operation.

The cutting wheel 120 is rotatably installed in a device body (not shown) for cutting the bar WR and receives rotational force from a cutting wheel rotating part 160, which will be described later, by the power transmitting part 110.

The cutting wheel 120 cuts the bar WR while rotating at a high speed (for example, 1500 rpm or more) and is continuously worn by friction with the bar WR. The abrasion limit amount (abrasion limit diameter) LD is set to the cutting wheel 120 in order to enable stable operation in consideration of the structure of the wheel fixing part 125 of the cutting wheel 120, the diameter of the bar WR, and the like. The material, size, thickness, etc. of the cutting wheel 120 used in the present invention are not limited as long as it is possible to cut the bar WR.

As described above, the cutting wheel 120 is worn down as the cutting operation of the bar WR proceeds, thereby reducing the diameter. However, the conventional bar cutting device 100 measures the diameter of the cutting wheel 120 in real time I could not. In order to solve this problem, the bar-cutting device 100 according to an embodiment of the present invention includes a thermal image measuring unit 130 and / or a laser sensor 140 so as to calculate the diameter of the bar WR in real- .

The thermal image measuring unit 130 may measure the diameter of the cutter wheel 120 which is reduced during the WR cutting operation and the image data of the glowing region (infrared region) due to the friction of the cutter wheel 120 in real time .

That is, when the cutting operation of the barrel WR proceeds, the outer circumferential portion 121 of the cutting wheel 120 is heated due to the friction between the cutting wheel 120 and the bar WR, The outer circumferential portion 121 is glowed. At this time, the difference in temperature between the outer circumferential portion 121 of the cutting wheel 120 and the ambient air is several hundreds of degrees Celsius or more, so that the reddish portion of the cutting wheel 120 can be clearly confirmed even with naked eyes. Particularly, since the bar-cutting apparatus 100 using the cutting wheel 120 does not normally use grinding oil or cooling water, the glowing region becomes clearer, and therefore, the infrared rays appearing on the outer circumferential portion 121 of the cutting wheel 120 (Infrared) region can be accurately measured through the thermal image measuring unit 130, and the image data can be collected.

In addition, the thermal image measuring unit 130 can collect thermal image data irrespective of dust and various contaminants generated during the cutting operation, and thus can be efficiently used for real time diameter measurement of the cutting wheel 120.

Thus, the collected image data is analyzed through the control unit C. The controller C is described as including the function of calculating the diameter of the cutting wheel 120 through the data collected from the thermal image measuring unit 130 or the measured values of the laser sensor 140, The diameter calculation unit is provided separately from the control unit C and is included in the configuration of the control unit C of the present invention.

The control unit C analyzes the pixel data of the reddish portion from the image data from the thermal image measuring unit 130 and calculates the current wear amount of the cutting wheel 120, . For example, by analyzing the pixel data, the real-time diameter of the cutting wheel 120 can be calculated by calculating the radius of the red-hot portion (infrared region) from the center of the cutting wheel 120.

The control unit C calculates the real time diameter of the cutting wheel 120 and controls the driving of the cutting wheel 120 or the replacement time of the cutting wheel 120 according to the real time diameter. For example, as the diameter of the cutter wheel 120 decreases, the rotational speed of the cutter wheel 120 may be adjusted or the feed rate of the cutter wheel 120 to the bar WR side may be adjusted. In addition, when the diameter of the cutter wheel 120 reaches the wear limit LD, it is possible to stop the cutting operation and / or to notify the operator through the display portion D that the cutter wheel 120 needs to be replaced .

In the case where the thermal image measuring unit 130 is used according to an embodiment of the present invention, not only the outer circumferential portion 121 of the cutting wheel 120 but also the heat generated in the inner region 122 of the cutting wheel 120 ) State can be confirmed. The friction between the outer circumferential portion 121 of the cutting wheel 120 is greatest during the normal cutting operation and the temperature of the outer circumferential portion 121 is high. However, in an abnormal situation such as a crack occurs in the cut wheel 120, The temperature of a portion of the inner region 122 of the cutting wheel 120 rises.

Therefore, if it is determined that there is a portion having a temperature higher than the preset value in the inner region 122 located inside the outer peripheral portion 121 of the cutting wheel 120 through the thermal image measuring unit 130, C determines that the cutting wheel 120 is abnormal and stops the driving of the cutting wheel 120 or the driving of the cutting wheel 120 such as reducing the rotational speed and / As shown in FIG. Accordingly, not only the smoothness of the cutting wheel 120 can be determined but also a safety accident due to cracking, breakage or the like of the cutting wheel 120 can be prevented in advance.

Meanwhile, the bar cutting device 100 according to an embodiment of the present invention may further include a laser sensor 140 for measuring the diameter of the cutting wheel 120. Here, the laser sensor 140 may include a transmission laser sensor 140. It is more preferable to use the transmission type laser sensor 140 because it is difficult to measure the real time diameter due to the heat generated in the outer circumferential portion 121 of the cutting wheel 120. However, The use of the reflection type laser sensor 140 is not excluded. Also, the laser sensor 140 may be used to measure the real diameter of the cutting wheel 120, but not limited thereto, and may be used to measure the initial diameter of the cutting wheel 120 before the cutting operation is performed.

As described above, in the case of using the thermal image measuring unit 130 and the laser sensor 140 together, the thermal image measuring unit 130 and the laser sensor 140 measure the data based on the data measured by the thermal image measuring unit 130 and the laser sensor 140, It is possible to measure the diameter of the electrode 120 in real time. The control unit C compares the diameter value of the cutting wheel 120 by the thermal image measuring unit 130 with the diameter value of the cutting wheel 120 by the laser sensor 140, The diameter of the cutter wheel 120 can be calculated stably even if noise is generated in the cutter wheel 130. Therefore, by measuring the diameter value (wear degree) of the cutting wheel 120 more stably, it is possible to perform a cutting operation corresponding to the reduction of the diameter of the cutting wheel 120 during the WR cutting operation, It is possible to more accurately determine whether or not it is reached.

Particularly, in the case of the laser sensor 140, it is possible to accurately measure the initial diameter (wear degree) of the cutting wheel 120 before the cutting operation is performed, It is possible to collect the pixel data of the thermal image irrespective of various contaminants and thereby to calculate the real time diameter of the cutting wheel 120. Accordingly, when the thermal image measuring unit 130 and the laser sensor 140 are used together, the real-time diameter value of the cutting wheel 120 can be more accurately measured.

As described above, by measuring the wear state of the cutting wheel 120, that is, the change in real time diameter of the cutting wheel 120 through the thermal image measuring unit 130 and / or the laser sensor 140, The wear amount of the cutting wheel 120 actually consumed in the work can be obtained. In addition, in the manufacturer of the cutting wheel 120, the wear amount estimation data of the cutting wheel 120 consumed at the time of cutting is provided.

Therefore, the controller C predicts the replacement time of the cutting wheel 120 by comparing the diameter value of the real-time cutting wheel 120 with the wear amount estimation data of the cutting wheel 120 for the bar WR to be cut And informs the operator of this through the display unit D.

For example, if the wear limit (LD) of the cutting wheel 120 is 45% of the initial diameter and the real time diameter value is 50% of the initial diameter, the cuttable remaining amount to the wear limit (LD) is 5% It is necessary to compare the data to be worn in the bar WR to be cut and to reach the abrasion limit LD during cutting so that the cutting operation is stopped and the replacement timing signal of the cutting wheel 120 It is possible to judge whether the operator should be notified. Thereby enabling the active cutting wheel 120 to be managed.

Although it is possible to determine the replacement time of the cutting wheel 120 in real time during the cutting operation for the bar WR, there is a high possibility that the cutting failure occurs when the cutting edge 120 reaches the wear limit LD during the cutting operation, It may be performed before the cutting operation of the trailing bar WR is performed after the completion of the cutting operation of the preceding bar WR.

That is, before the cutting operation of the trailing bar WR is completed after the cutting operation of the preceding bar steel WR is completed, the control unit C determines the predicted value of the cutting wheel 120 expected at the completion of the operation of the trailing bar WR The diameter of the cutting wheel 120 may be compared with the wear limit LD to determine the replacement time of the cutting wheel 120 to thereby maximize the wear limit LD of the cutting wheel 120, The service life can be increased.

The apparatus for cutting a bar steel 100 according to an embodiment of the present invention includes a cutting wheel feeding part 180 for feeding the cutting wheel 120 to a bar WR side for cutting a bar WR, 120 may be further included. The apparatus for cutting a bar steel 100 according to an embodiment of the present invention includes a vibration sensor 150 for measuring vibration due to the driving of the cutting wheel 120 and a vibration sensor 150 for measuring a current value applied to the cutting wheel rotation unit 160 The current sensor 170 may be provided. 4, the cutting wheel transfer unit 180 may have a structure that causes the power transmission unit 110 and the cutting wheel 120 connected thereto to move back and forth in the direction of the bar WR (in the direction of H) have.

When the vibration sensor 150 is provided, the controller C controls the driving of the cutting wheel 120 (L1 in Fig. 4) based on the vibration value measured by the vibration sensor 150 , L4).

The cutting wheel 120 is moved to the bar WR side through the cutting wheel feeder 180. When the bar WR comes into contact with the cutting wheel 120, A strong vibration and an impact are applied to the cutter wheel 120 due to the increase of the frictional force and the load, and fatigue failure of the cutter wheel 120 can be caused, . In addition, the vibration continues to occur during the continuous friction cutting process of the cutting wheel 120 and the bar WR, and this vibration leads to the vibration of the cutting wheel 120, so that the cutting wheel 120 can not be used up to the wear limit . In order to solve such a problem, an embodiment of the present invention may include a vibration sensor 150 installed in the device body, particularly, the power transmission part 110 where vibration is largely generated.

The control unit C can sense the cutting start point when the bar WR and the cutting wheel 120 are in contact with each other using the vibration sensor 150, The driving of the cutting wheel 120 can be controlled so that the contact force is gradually increased. When the excessive force is applied to the cutting wheel 120, the amount of vibration may increase. If the control unit C detects that the vibration value is larger than (or exceeds) the set value, The driving of the cutting wheel 120 can be controlled.

In this way, the control unit C can be configured to monitor the amount of vibration while increasing the pressing force, and to apply the cutting force to the cutting wheel 120 so that the vibration is minimized.

The control unit C determines whether the amount of vibration of the cutting wheel 120 is greater than the amount of wear to the wear limit LD through the vibration amount of the power transmitting unit 110 and the diameter of the cutting wheel 120 in real- , It is possible to obtain facility safety during operation close to the abrasion limit.

When the current sensor 170 is provided, the controller C controls the cutting wheel (L3 in FIG. 4) based on the current value measured by the current sensor 170 while the WR cutting operation is in progress 120 (L 2, L 4 in FIG. 4).

4, in order to stably cut the bar WR, the cut wheel transfer unit 180 may be configured to move the power transmission unit 110 and the cutting wheel 120 connected thereto to the bar WR side (In the direction of the arrow).

Referring to FIG. 1, in the bar cutting device 100, a force (torque) received by the cutting wheel 120 increases as cutting proceeds. In order to offset the torque variation due to the increase of the frictional resistance and to rotate at a constant speed, the cutting wheel rotation unit 160 (for example, Motor) is increased. Since the increase in the current value is a value that reflects the degree of cutting, the current value applied to the cutting wheel rotation unit 160 is detected through the current sensor 170, It is desirable to adjust the speed.

For example, when the current value measured by the current sensor 170 increases, the control unit C lowers the feed rate of the cut-off wheel feed unit 180, and the current value measured by the current sensor 170 The feeding speed of the cutter wheel feeder 180 may be increased. Specifically, the controller C has a small contact area between the bar WR and the cutter wheel 120 at the beginning of the cutting of the bar WR, and thus the current value applied to the cutter wheel rotator 160 is low. When the contact area between the bar WR and the cutter wheel 120 increases as the cutting progresses, the current value applied to the cutter wheel turner 160 increases, When the contact area between the bar WR and the cutting wheel 120 is reduced due to the half or more of the cutting of the bar WR and the feed speed of the feed wheel 180, (Cutting speed).

Thus, by adjusting the feeding speed of the cutter wheel feeder 180 in inverse proportion to the current value applied to the cutter wheel rotating unit 160, the stability of the driving current and the stability of the cutting process can be secured at the same time.

The bar-cutting device 100 according to an embodiment of the present invention includes a bar strength fixing part 190 for fixing a bar WR to be cut, A clamping roll 191 fixed to both sides of the cutting wheel 120 so as to support a lower portion of the cutting wheel 120 and a clamping roll 191 fixed to both sides of the cutting wheel 120 to vertically clamp the bar WR, And a lifting and supporting roll 193 which is vertically movable to further support the bar WR supported by the fixed roll 191 from the lower side.

Since the bar fixing part used in the conventional bar cutting device has a simple clamping structure for fixing the bar WR, the bar WR vibrates greatly during the cutting operation and the straightness of the cutting face is low, There was a problem that it was low.

However, the bar strength fixing unit 190 according to an embodiment of the present invention has a lower clamping unit 192b for performing clamping in conjunction with the upper clamping unit 192a, It is possible not only to securely fix the bar WR during the WR cutting operation but also to minimize the vibration and improve the straightness of the cutting face and to improve the quality of the cutting face.

Particularly, by adopting a configuration in which the lower clamping means 192b and the lifting and lowering support roll 193 are simultaneously lifted and lowered, it is possible to obtain an effect that the fixing operation of the bar WR is easier.

Next, the bar cutting method according to one embodiment of the present invention will be described with reference to the flowchart of Fig. Here, the reference numerals of the structures provided in the bar steel cutting method will be described with reference to Figs. 3 to 5 as an example.

The bar cutting method S100 according to an embodiment of the present invention includes a bar bar fixing step S110 and a bar WR cutting step S120 to determine whether or not the cutting wheel 120 needs to be replaced (S130). ≪ / RTI >

First, in the bar fixing step S110, the bar WR is fixed to the bar strength fixing part 190 so as to correspond to the cutting position of the bar WR. As an example of the bar strength fixing part 190, the configuration shown in FIG. 5 may be used, but it is not limited thereto, and various structural changes are possible if the bar WR can be fixed.

The bar cutting step S120 is a step of rotating the cutting wheel 120 to cut the bar WR. At this time, the bar cutting step S120 may include at least a part of the control functions of the control part C described in the above-described bar cutting device 100, and thus the specific configuration of the bar cutting step S120 I will replace it as soon as possible. Hereinafter, only the main configuration of the bar cutting step (S120) will be briefly described.

When cutting of the bar WR is started (S121), the bar cutting step S120 controls the driving of the cutting wheel 120 (S122). When an abnormality occurs in the cutting wheel 120 (S123) (S127). If there is no abnormality, the step S124 of completing the cutting operation can be included.

In this case, the bar cutting step S120 may be performed in accordance with the diameter of the cutting wheel 120 calculated in real time from the image data of the thermal image measuring unit 130, which senses the heat- And at least one of the driving and replacement timing of the battery 120 is controlled.

3 and 4, in order to measure the diameter of the cutting wheel 120 which is reduced during the WR cutting operation through the thermal image measuring unit 130, (Infrared region) caused by the cutting wheel 120 in real time and analyzes the pixel data of the reddish portion from the image data to calculate the current amount of wear of the cutting wheel 120, The diameter can be calculated.

It is also possible to measure the real time diameter of the cutting wheel 120 in parallel with the laser image sensor 140 as well as the thermal image measuring unit 130 described above in step S120. In this case, the bar cutting step S120 calculates the diameter of the cutting wheel 120 measured from the laser sensor 140 and the diameter of the cutting wheel 120 calculated from the image data of the thermal image measuring unit 130 .

In step S 120, the cutting operation is controlled in step S 120 according to the calculated real-time diameter in step S 120. In step S 122, it is determined whether an error has occurred in the cutting wheel 120 in step S 123. It is possible to determine the replacement timing of the cutting wheel 120.

For example, in the driving control process S122 of the cutting wheel 120, as the diameter of the cutting wheel 120 decreases, the rotation speed of the cutting wheel 120 is adjusted or the rotation speed of the cutting wheel 120 toward the bar WR side Can be adjusted. When the cutting wheel 120 detects that the cutting wheel 120 is in contact with the bar WR based on the vibration value measured by the vibration sensor 150 through the driving control process S122 of the cutting wheel 120, 120 can be increased. In addition, the driving control process S122 of the cutting wheel 120 may be configured to reduce the vibration by adjusting the pressing force of the cutting wheel 120 when the vibration value measured by the vibration sensor 150 exceeds a set value It is possible.

The cutting wheel 120 is rotated by a driving control process S122 of the cutting wheel 120 in a direction opposite to the current value applied to the cutting wheel rotating unit 160, It is also possible to control the feeding speed of the wheel feeding section 180.

For example, when the diameter of the cutting wheel 120 reaches the wear limit LD or when the cutting wheel 120 is rotated through the thermal image measuring unit 130, Or when the amount of vibration of the cutting wheel 120 is larger than the amount of wear of the cutting wheel 120 to the wear limit LD, the cutting operation is stopped and / or the display portion D The operator can be notified that the cutting wheel 120 needs to be replaced.

Finally, the step S130 of determining whether or not the cutting wheel 120 needs to be replaced is determined by comparing the diameter of the cutting wheel 120, which is expected upon completion of the cutting operation of the trailing bar WR after completion of the cutting step, Thereby determining whether or not the cutting wheel 120 needs to be replaced.

That is, since the cutting failure is likely to occur when the wear limit (LD) is reached during the cutting operation of the bar WR, the diameter of the cutting wheel 120, which is expected upon completion of the operation of the trailing bar WR It is possible to determine the replacement timing of the cutting wheel 120 by judging whether or not the wear limit LD is exceeded. In this way, the wear limit (LD) of the cutting wheel 120 can be maximally utilized, so that the service life of the cutting wheel 120 can be increased.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be obvious to those of ordinary skill in the art.

Although the present invention has been described with respect to an embodiment in which a laser sensor is used in addition to a thermal image measuring unit for real time diameter measurement of a cutting wheel in the present specification, the scope of the present invention includes a laser sensor It is also possible to include embodiments that measure the real-time diameter of the wheel.

100 ... bar steel cutting device 110 ... power transmission portion
120 ... cutting wheel 121 ... outer circumferential portion
122 ... inner region 130 ... thermal image measuring section
140 ... laser sensor 150 ... vibration sensor
160 ... Cutting wheel rotation part 170 ... Current sensor
180 ... cutting wheel feed portion 190 ... bar steel fixing portion

Claims (19)

A cutting wheel rotatably mounted on the apparatus body for cutting the barrel;
A thermal image measuring unit for collecting, in real time, image data of a red-hot portion of the cutting wheel when the bar is cut by the cutting wheel; And
A controller for calculating a diameter of the cutting wheel from the image data collected by the thermal image measuring unit and controlling at least one of driving and replacing the cutting wheel according to the diameter of the cutting wheel;
. The method according to claim 1,
And the thermal image measuring unit measures the infrared region of the surface of the cutting wheel. 3. The method of claim 2,
Wherein the control unit determines that there is an abnormality in the cutting wheel and controls the driving of the cutting wheel when there is a portion having a temperature higher than a set value in the inner region of the cutting wheel. The method according to claim 1,
The control unit determines the replacement time of the cutting wheel by comparing the diameter of the cutting wheel expected at the completion of the operation of the trailing bar with the wear limit amount before the cutting operation of the trailing bar is completed after the cutting operation of the preceding bar steel is completed And a cutting device for cutting the bar. The method according to claim 1,
A laser sensor for measuring the diameter of the cutting wheel in real time;
Further comprising a bar-cutter. 6. The method of claim 5,
Wherein the laser sensor is a transmission type laser sensor. The method according to claim 5 or 6,
Wherein the control unit calculates the diameter of the cutting wheel in real time based on the data measured by the thermal image measuring unit and the laser sensor. 7. The method according to any one of claims 1 to 6,
A cutting wheel feeder for feeding the cutting wheel to the barrel side for cutting the barrel; And
A vibration sensor for measuring vibration due to driving of the cutting wheel;
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Wherein the control unit controls the driving of the cutting wheel based on the vibration value measured by the vibration sensor. 9. The method of claim 8,
Wherein when the cutting wheel is brought close to the bar by the cutting wheel transfer unit, the control unit increases the pressing force of the cutting wheel when it is detected that the cutting wheel is in contact with the bar through the vibration sensor. Device. 9. The method of claim 8,
Wherein the control unit reduces the vibration by adjusting the pressing force of the cutting wheel when the vibration value measured by the vibration sensor exceeds the set value. 9. The method of claim 8,
A cutting wheel rotating part for rotating the cutting wheel; And
A current sensor for measuring a current value applied to the cutting wheel rotating unit;
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Wherein the control unit controls the driving of the cutting wheel based on the current value measured by the current sensor while the bar cutting operation is in progress. 12. The method of claim 11,
Wherein the control unit lowers the feeding speed of the cutting wheel feeding unit when the current value measured by the current sensor increases and increases the feeding speed of the cutting wheel feeding unit when the current value measured by the current sensor decreases. Bar steel cutting device. 7. The method according to any one of claims 1 to 6,
A bar steel fixing part for fixing the bars to be cut;
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The bar-
A stationary roll fixed to both sides of the cutting wheel so as to support the bottom of the bar,
Clamping means provided so as to be movable up and down so as to clamp the bar steel in the vertical direction from both sides of the cutting wheel,
And a lifting and lowering support roll provided so as to be movable up and down so as to further support the bar steel supported by the fixed roll from the lower side.
A bar-fixing step of fixing the bar steel to the barrel fixing portion corresponding to the cutting position of the barrel; And
And a bar cutting step of rotating the cutting wheel to cut the bar steel,
Wherein the bar cutting step is configured to control at least one of driving and replacing time of the cutting wheel according to the diameter of the cutting wheel calculated in real time from the image data of the thermal image measuring unit sensing the heat- Way. 15. The method of claim 14,
Wherein the bar cutting step is configured to control at least one of driving and replacement timing of the cutting wheel according to the diameter of the cutting wheel measured from the laser sensor and the diameter of the cutting wheel calculated from the image data of the thermal image measuring unit, Way. 16. The method according to claim 14 or 15,
Determining whether the cutting wheel needs to be replaced by comparing the diameter of the cutting wheel expected when the cutting operation of the trailing bar is completed after completion of the cutting step with the wear limit amount;
Further comprising the step of cutting the bar. 16. The method according to claim 14 or 15,
Wherein the bar cutting step increases the pressing force of the cutting wheel when it is detected that the cutting wheel is in contact with the bar based on the vibration value measured by the vibration sensor. 16. The method according to claim 14 or 15,
Wherein the bar cutting step adjusts the pressing force of the cutting wheel to reduce the vibration when the vibration value measured by the vibration sensor exceeds the set value. 16. The method according to claim 14 or 15,
Wherein the bar cutting step controls the feed rate of the cutting wheel feeding part for feeding the cutting wheel in inverse proportion to the current value applied to the cutting wheel rotating part for rotating the cutting wheel.

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