Peeling apparatus and signal processing method

Abstract

To provide a peeling apparatus and a signal processing method capable of identifying the positional information of the butt joints of rod materials continuously supplied to the peeling apparatus. [Solution] From the source signal output from the peeling device, a main signal is obtained that includes a first peak caused by the butt joint of the bar passing through any part of the peeling device, a second peak caused by noise, and, if a processing abnormality occurs during processing of the bar, a third peak caused by the processing abnormality. Simultaneously, one or more sub-signals are obtained from the source signal to identify the first peak included in the main signal. Furthermore, an assumed boundary range in which the first peak is expected to appear is calculated based on the sub-signals, and the largest peak that appears within the assumed boundary range of the main signal is identified as the first peak.

Description

Technical Field

[0001] The present invention relates to a peeling device and a signal processing method, and more particularly to a peeling device and a signal processing method capable of specifying the position information of the butting portion of a bar continuously supplied to the peeling device.

Background Art

[0002] The "peeling device (PM)" refers to a device for removing surface defects such as mill scale, decarburized layer, scratches, and poorly hardened layer on the outer peripheral surface of a bar (round bar) by cutting while continuously supplying the bar cold-rolled or hot-rolled.

[0003] The peeling device has the advantage that it can continuously process a large amount of bars because it is not necessary to attach and detach the bars during processing. However, the peeling device (a) When the cutting tool is damaged during processing, scratches (cutter marks) may occur on the bar surface. (b) When the bar passes through the feed roller, the stepped portion of the feed roller may bite into the bar surface, and scratches (concave deformation) may occur on the bar surface. (c) When the roundness of the bar is low, mill scale may remain after processing. (d) When chatter vibration occurs during processing, scratches may occur on the bar surface. and other problems.

[0004] When the cutting tool is damaged during processing, it is necessary to promptly stop the peeling device and replace the cutting tool. Also, when a scratch occurs on the bar surface during processing, it is necessary to promptly identify the bar with the scratch and perform repair or discard. For this purpose, it is necessary to accurately detect the presence or absence of processing abnormalities during peeling. Regarding such abnormality detection methods, various proposals have been made conventionally.

[0005] For example, in Patent Document 1, a vibration detection sensor is installed in a machine body equipped with a cutter, Determine whether the magnitude of vibration detected by the vibration detection sensor exceeds a threshold. A cutting anomaly detection device has been disclosed.

[0006] The document states: (a) During normal processing, the magnitude of vibration does not exceed the threshold, and the magnitude of vibration exceeds the threshold only when the butt joint of the peeling material passes through the cutter, and (b) When the cutter blade is damaged, the point at which the magnitude of vibration exceeds the threshold multiple times during the transport of a single peeling material. It is stated.

[0007] Patent Document 2 does not describe a method for detecting anomalies, A chip-blocking plate is installed between the cutter head and the guide roller mechanism. A cutting fluid flow hole is formed in the chip stopper plate, and the cutting fluid is forcibly discharged from the guide roller mechanism side toward the cutter head side through the cutting fluid flow hole. The peeling machine has been disclosed.

[0008] The document states: (a) If a chip-blocking plate is simply installed between the cutter head and the guide roller mechanism, the proportion of cutting fluid reaching the cutting area will be extremely small, resulting in wasted cutting fluid, and, (b) By forming cutting fluid flow holes in the chip stopper plate, cutting fluid can be accurately supplied to the cutting area, thereby extending the life of the cutting tool. It is stated.

[0009] Patent Document 3 contains: The type of tool and workpiece is estimated from the image data of the tool and workpiece. A machining anomaly detection algorithm is selected based on the estimated tool and workpiece type. The selected machining anomaly detection algorithm is used to input machining data and determine the degree of machining anomaly. If the degree of anomaly exceeds a threshold, it is determined to be a machining anomaly. A method for detecting processing abnormalities has been disclosed.

[0010] The same document describes that using such a method can achieve high-precision machining anomaly detection without human intervention.

[0011] Patent Document 4 discloses converting the sound generated when the workpiece is cut into an electrical signal, removing the noise caused by the rotation of the tool from the electrical signal, smoothing the electrical signal with the removed noise over time, and determining that the tool is worn when the smoothed electrical signal exceeds a threshold value an anomaly detection device.

[0012] The same document describes that using such a method can suppress false determination of anomalies caused by external sounds around the machine tool and noise from electronic components provided in the machine tool.

[0013] Patent Document 5 discloses extracting amplitude data from the vibration signal detected by a vibration sensor, calculating the Mahalanobis distance by the MT (Mahalanobis-Taguchi) method using the extracted amplitude data as a feature quantity, and determining that the cutting edge of the cutting tool is defective when the Mahalanobis distance exceeds a threshold value an anomaly detection device.

[0014] The same document describes that using such a method can stably detect anomalies of cutting tools regardless of the progress of tool wear.

[0015] Furthermore, Patent Document 6 discloses measuring the strain generated in the tool while machining the workpiece to be machined, inputting the measured strain into a machine learning model, and determining that an anomaly has occurred when the anomaly degree exceeds a threshold value an anomaly detection system.

[0016] The same document describes that when using such a method, it is possible to detect tool abnormalities using information that accurately reflects the state of the tool attached to the machine tool.

[0017] When processing a bar using a peeling device, various signals (hereinafter collectively referred to as "source signals") that reflect the processing state of the bar are output from the peeling device. Examples of source signals include, for example, a signal indicating the magnitude of vibration output from a vibration sensor, an output signal of a cutter motor, and the like.

[0018] When the butting portion of the bar passes through any part of the peeling device, a change in amplitude (hereinafter also referred to as "the first peak") appears in the source signal. Similarly, when a processing abnormality occurs during the peeling process of the bar, a change in amplitude also appears in the source signal. Therefore, in order to accurately determine the presence or absence of a processing abnormality using the source signal, it is necessary to identify the first peak included in the source signal and remove the first peak from the source signal.

[0019] However, since the end faces of each bar continuously supplied to the peeling device are not necessarily perpendicular to the axial direction, the magnitude of the first peak usually does not become constant. Therefore, in the method of identifying the peak whose amplitude magnitude exceeds a threshold value as the first peak among the peaks included in a certain specific signal, there is a risk of a decrease in the identification accuracy of the first peak.

Prior Art Documents

Patent Documents

[0020]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

[0021] The problem that the present invention aims to solve is to provide a peeling device that can identify the positional information of the butt joints of rod materials that are continuously supplied to the peeling device. Another problem that the present invention aims to solve is to provide a signal processing method that can identify the positional information of the butt joints of rod materials that are continuously supplied to a peeling device. [Means for solving the problem]

[0022] To solve the above problems, the peeling apparatus according to the present invention has the following configuration. (1) The peeling apparatus is A cutting device for cutting the outer surface of a bar material, A feed device for continuously supplying a plurality of the aforementioned rod materials to the cutting device, A carriage device for transporting the rod material discharged from the cutting device to the downstream side, An inlet guide device for guiding the rod material supplied from the feed device to the machining center of the cutting device, An outlet guide device for guiding the rod material discharged from the cutting device to the carriage device, An exit pinch device for pulling the rod material conveyed by the carriage device to the downstream side, A control device for controlling the cutting device, the feed device, the carriage device, the inlet guide device, the outlet guide device, and the outlet pinch device. It is equipped with. (2) The control device is A main signal acquisition device acquires a main signal from the source signals output from the cutting device, the feed device, the carriage device, the inlet guide device, the outlet guide device, and the outlet pinch device, which includes a first peak caused by the butt joint of the bar passing through any part of the peeling device, a second peak caused by noise, and, if a processing abnormality occurs during the processing of the bar, a third peak caused by the processing abnormality. A sub-signal acquisition device that acquires one or more sub-signals from the source signal to identify the first peak included in the main signal, A first peak identification device calculates an assumed boundary range in which the first peak is expected to appear based on the sub-signal, and identifies the largest peak appearing within the assumed boundary range of the main signal as the first peak. It is equipped with.

[0023] The signal processing method according to the present invention is (A) A cutting device for cutting the outer surface of a bar material, A feed device for continuously supplying a plurality of the aforementioned rod materials to the cutting device, A carriage device for transporting the rod material discharged from the cutting device to the downstream side, An inlet guide device for guiding the rod material supplied from the feed device to the machining center of the cutting device, An outlet guide device for guiding the rod material discharged from the cutting device to the carriage device, An exit pinch device for pulling the rod material conveyed by the carriage device to the downstream side, A main signal acquisition step is to acquire a main signal from the source signal output from a peeling device equipped with a first peak caused by the butt joint of the rod passing through any part of the peeling device, a second peak caused by noise, and, if a processing abnormality occurs during processing of the rod, a third peak caused by the processing abnormality. (B) A sub-signal acquisition step of acquiring one or more sub-signals from the source signal to identify the first peak included in the main signal, (C) A first peak identification step which involves calculating an assumed boundary range in which the first peak is expected to appear based on the sub-signal, and identifying the largest peak that appears within the assumed boundary range of the main signal as the first peak. It is equipped with. [Effects of the Invention]

[0024] By obtaining the main signal and sub-signal from the source signal, the sub-signal can be used to calculate the expected boundary range in which the first peak is expected to appear. Once the expected boundary range is known, the largest peak appearing within the expected boundary range of the main signal can be identified as the first peak. Using this method, the first peak can be accurately identified even if its magnitude fluctuates due to unforeseen circumstances. Furthermore, by using the main signal in which the first peak has been accurately identified to determine machining abnormalities, the accuracy of the machining abnormality determination and the accuracy of identifying the bar material in which the machining abnormality occurred are improved. [Brief explanation of the drawing]

[0025] [Figure 1] This is a schematic diagram of a peeling device. [Figure 2] This is a schematic diagram illustrating a method for identifying the first peak using the cutter motor output signal, the carriage device position signal, and the feed rate signal. [Figure 3] This is a schematic diagram illustrating a method for identifying the first peak using the acceleration signal from an accelerometer installed in a feed device and the rotational speed signal from an inlet roller motor provided in an inlet guide device. [Modes for carrying out the invention]

[0026] One embodiment of the present invention will be described in detail below. [1. Peeling device] Figure 1 shows a schematic diagram of a peeling apparatus. In Figure 1, the peeling apparatus 10 comprises a cutting device 20, a feed device 30, a carriage device 40, an inlet guide device 50, an outlet guide device 60, an outlet pinch device 70, and a control device (not shown).

[0027] [1.1. Cutting equipment] The cutting device 20 is a device for cutting the outer surface of the bar stock 12. The cutting device 20 comprises a cylindrical rotating spindle 22, a cutter head 24 provided on the upstream end face of the rotating spindle 22, holders 26a to 26d provided on the upstream end face of the cutter head 24, and a cutter motor (not shown) for rotating the rotating spindle 22.

[0028] The cutter head 24 is hollow and disc-shaped, with the rod material 12 passing through the hollow portion. Holders 26a to 26d are attached to the upstream end face of the cutter head 24 at 90° intervals. Cutting tips 28 are attached to the tips of each of the holders 26a to 26d. The rotating spindle 22 and the cutter motor are connected by a timing belt (not shown), and the rotating spindle 22 is rotated via the cutter motor and timing belt.

[0029] [1.2. Feed device] The feed device 30 is a device for continuously supplying a plurality of bar stocks 12 to the cutting device 20. The feed device 30 comprises a pair of first feed rollers 22a, 22a installed on the upstream side, a pair of second feed rollers 22b, 22b installed on the downstream side, a hydraulic cylinder (not shown) for moving the first and second feed rollers in the vertical direction, and a drive motor (not shown) for rotating the first and second feed rollers.

[0030] The first feed rollers 22a, 22a and the second feed rollers 22b, 22b are for conveying the bar material 12. Their outer surfaces have a V-shaped cross-section, and numerous protrusions are formed on the contact surfaces with the bar material 12. When cutting the bar material 12, the first and second feed rollers are rotated via a drive motor while the bar material 12 is held between the first and second feed rollers from above and below via a hydraulic cylinder. This allows the bar material 12 to be forcibly fed into the cutting device 20 while suppressing its rotation in the circumferential direction.

[0031] [1.3. Carriage Device] The carriage device 40 is a device for transporting the bar material 12 discharged from the cutting device 20 to the downstream side. The carriage device 40 comprises a mobile table 42, a pair of clamps 44, 44 provided on the mobile table 42, a guide rod 46 installed along the transport direction of the bar material 12, a hydraulic cylinder (not shown) for moving the clamps 44, 44 in the vertical direction, and a drive rack (not shown) for moving the mobile table 44 in the horizontal direction along the guide rod 46.

[0032] The clampers 44, 44 are for gripping the bar material 12 discharged from the cutting device 20 from above and below. The guide rod 46 is for restricting the direction of movement of the mobile table 42 to the direction of transport of the bar material 12, and is inserted into the lower part of the mobile table 42.

[0033] Initially, the mobile table 42 is waiting at the position furthest from the cutting device 20. Once the processing of the bar stock 12 begins and a predetermined time has elapsed, the drive rack is activated to move the mobile table 42 to the position closest to the cutting device 20. Furthermore, after the tip of the bar stock 12 discharged from the cutting device 20 has passed through the clampers 44, 44 and a predetermined time has elapsed, the hydraulic cylinder is activated to clamp the bar stock 12 with the clampers 44, 44. At the same time, the drive rack is activated to move the mobile table 44 downstream along the guide rod 46.

[0034] The mobile platform 42 reaches the position furthest from the cutting device 20, and after transferring the bar material 12 to the exit pinching device 70, the clampers 44, 44 are released and it waits in place. In actual processing, multiple rod materials 12 are supplied in succession, so the series of operations described above are repeated.

[0035] [1.4. Entrance Guide Device] The inlet guide device 50 is a device for guiding the bar material 12 supplied from the feed device 20 to the machining center of the cutting device 20. The inlet guide device 50 comprises a pair of first inlet guide rollers 52a, 52a located on the upstream side, a pair of second inlet guide rollers 52b, 52b located on the downstream side, a hydraulic cylinder (not shown) for moving the first and second inlet guide rollers vertically, and an inlet roller motor (not shown) for driving the first and second inlet guide rollers.

[0036] The bar material 12 supplied from the feed device 30 is guided through the first inlet guide rollers 52a, 52a and the second inlet guide rollers 52b, 52b to the machining center of the cutting device 20 (the area surrounded by the four holders 26a to 26d).

[0037] [1.5. Exit Guide Device] The exit guide device 60 is a device for guiding the rod material 12 discharged from the cutting device 20 to the carriage device 40. The exit guide device 60 comprises a pair of first exit guide rollers 62a, 62a located on the upstream side, a pair of second exit guide rollers 62b, 62b located on the downstream side, a hydraulic cylinder (not shown) for moving the first and second exit guide rollers vertically, and an exit roller motor (not shown) for driving the first and second exit guide rollers.

[0038] The bar material 12 discharged from the cutting device 20 is guided to the carriage device 40 by passing through the first outlet guide rollers 62a, 62a and the second outlet guide rollers 62b, 62b.

[0039] [1.6. Exit pinch device] The exit pinch device 70 is a device for pulling the rod material 12, which has been transported by the carriage device 40, to the downstream side. The exit pinch device 70 comprises a pair of pinch rollers 72, 72, a hydraulic cylinder (not shown) for moving the pinch rollers 72, 72 in the vertical direction, and a pinch roller motor (not shown) for driving the pinch rollers 72, 72.

[0040] After the upstream end of the bar material 12 is separated from the cutting device 20, the downstream end of the bar material is gripped by the pinch rollers 72, 72, and the pinch rollers 72, 72 are rotated to discharge the bar material 12 downstream at high speed.

[0041] [1.7. Control Device] The control device (not shown) is a device for controlling the cutting device 20, the feed device 30, the carriage device 40, the entrance guide device 50, the exit guide device 60, and the exit pinch device 70. In the present invention, in addition to a device for controlling the normal operation of these devices, the control device includes a device for identifying the position information of the butt joints of the continuously supplied rod material 12. Specifically, in the peeling apparatus 10 according to the present invention, the control device includes a main signal acquisition device (not shown), a sub-signal acquisition device (not shown), and a first peak identification device (not shown).

[0042] [1.7.1. Main signal acquisition device] A "main signal acquisition device" refers to a device used to acquire the main signal from among the source signals. "Source signal" refers to a signal output from the cutting device 20, feed device 30, carriage device 40, inlet guide device 50, outlet guide device 60, and outlet pinch device 70, which includes information regarding the processing state of the bar stock 12.

[0043] "Main signal" refers to the source signal, (a) Changes in amplitude (hereinafter also referred to as the "first peak") caused by the butt joint of the rod material 12 passing through any part of the peeling device 10, and, (b) Changes in amplitude caused by noise (hereinafter also referred to as the "second peak"), and, (c) If a machining abnormality occurs during the processing of the bar material 12, the change in amplitude caused by the machining abnormality (hereinafter also referred to as the "third peak") This refers to a signal that includes [a specific element].

[0044] In the present invention, the method for acquiring the main signal is not particularly limited, and the most suitable method can be selected depending on the purpose. Furthermore, in this invention, the type of main signal is not particularly limited, and the optimal signal can be selected according to the purpose.

[0045] For example, the output signal of the cutter motor of the cutting device 20 can be the main signal. When the cutting process of the bar material 12 is stable, the output signal of the cutter motor is almost constant, containing only slight amplitude fluctuations (second peak) caused by noise.

[0046] On the other hand, when the butt joint of the bar material 12 passes through the cutting device 20, the cutting tool momentarily becomes idle. As a result, the output of the cutter motor momentarily decreases, and a first peak appears in the output signal of the cutter motor. However, since the end face of the bar material 12 is not necessarily perpendicular to the axial direction, the magnitude of the first peak varies depending on the condition of the end face of the bar material 12. Furthermore, if a malfunction occurs in the cutting tool and the cutting resistance suddenly increases, a large load is placed on the cutter motor. As a result, the output of the cutter motor increases, and a fluctuation in amplitude (third peak) appears in the output signal of the cutter motor.

[0047] Alternatively, if an accelerometer is installed near the first feed rollers 22a, 22b or near the second feed rollers 22b, 22b of the feed device 30, the acceleration signal output from the accelerometer can become the main signal. When the feed roller is positioned in the middle of the rod 12, the acceleration signal output from the accelerometer is almost constant, containing only slight amplitude fluctuations (second peak) due to noise.

[0048] On the other hand, when the butt joint of the bar 12 passes through the feed roller, a large vibration is instantaneously generated. As a result, the acceleration increases instantaneously, and a first peak appears in the acceleration signal. However, since the end face of the bar 12 is not necessarily perpendicular to the axial direction, the magnitude of the first peak varies depending on the condition of the end face of the bar 12. Furthermore, if an abnormality occurs in the cutting tool, or if the butt joint of the bar material 12 passes through the cutting device 20, vibration may occur in the cutting device 20, and this vibration may be transmitted to the feed device 30 via the inlet guide device 50. As a result, the acceleration increases instantaneously, and fluctuations in amplitude (third peak or first peak) appear in the acceleration signal.

[0049] Other source signals that can serve as the main signal include, for example, (a) Cutter motor load current signal, (b) Torque signal of the cutter motor, (c) Output signal of the motor for driving the feed roller, (d) Load current signal of the motor for driving the feed roller, These are some examples.

[0050] [1.7.2. Sub-signal acquisition device] A "sub-signal acquisition device" refers to a device used to acquire a sub-signal from the source signal. A "secondary signal" refers to one or more signals within the source signal used to identify the first peak included in the main signal. In other words, a "secondary signal" is a signal from which the "assumed delimiter range," described later, can be calculated.

[0051] In the present invention, the method for acquiring the secondary signal is not particularly limited, and the most suitable method can be selected depending on the purpose. Furthermore, in the present invention, the type of sub-signal is not particularly limited, and the optimal signal can be selected according to the type of main signal.

[0052] For example, if the output signal of the cutter motor provided in the cutting device 20 is selected as the main signal, the position signal of the carriage device 40 and the feed rate signal of the feed device 30 may become secondary signals.

[0053] Furthermore, for example, if the acceleration signal from the accelerometer installed in the feed device 30 is selected as the main signal, the rotation speed signal from the motor for the inlet roller provided in the inlet guide device 50 can become a secondary signal.

[0054] Other potential source signals that could serve as secondary signals include, for example, the rotation speed signal of the motor for the exit roller.

[0055] [1.7.3. First Peak Identification Device] A "first peak identification device" is a device that calculates an assumed boundary range based on the secondary signal and identifies the largest peak that appears within the assumed boundary range of the main signal as the first peak. The "expected boundary range" refers to the time range in which the first peak is expected to appear within the main signal, when time is plotted on the horizontal axis and the intensity of the main signal on the vertical axis.

[0056] By selecting the optimal secondary signal according to the type of main signal, the expected boundary range can be calculated from the secondary signal. Furthermore, once the expected boundary range is known, the largest peak appearing within the expected boundary range among the peaks appearing in the main signal can be identified as the first peak. The magnitude of the first peak varies depending on the condition of the end face of the bar material 12. Therefore, in a method that identifies the position of the butt joint based on whether or not the first peak exceeds a threshold, the accuracy of identifying the first peak may decrease. In contrast, using the method according to the present invention, the first peak can be accurately identified even if its magnitude increases or decreases due to force majeure. Details of the method for calculating the assumed delimiter range will be described later.

[0057] [2. Signal Processing Method] The signal processing method according to the present invention comprises a main signal acquisition step, a sub-signal acquisition step, and a first peak identification step.

[0058] [2.1. Main signal acquisition process] The main signal acquisition process is the process of acquiring the main signal from the source signals output from the peeling device 10.

[0059] [2.1.1. Peeling device] The peeling device 10 is A cutting device 20 for cutting the outer surface of the bar material 12, A feed device 30 for continuously supplying multiple rod materials 12 to the cutting device 20, A carriage device 40 for transporting the rod material 12 discharged from the cutting device 20 to the downstream side, An entrance guide device 50 for guiding the rod material 12 supplied from the feed device 20 to the machining center of the cutting device 20, An outlet guide device 60 for guiding the rod material 12 discharged from the cutting device 20 to the carriage device 40, An exit pinch device 70 for pulling the rod material 12, which has been transported by the carriage device 40, to the downstream side, It is equipped with.

[0060] Details of the cutting device 20, feed device 30, carriage device 40, inlet guide device 50, outlet guide device 60, and outlet pinch device 70 are as described above, so their explanation will be omitted.

[0061] [2.1.2. Source signal, main signal] Details regarding the source signal and main signal are as described above, so we will omit further explanation.

[0062] [2.2. Sub signal acquisition process] The secondary signal acquisition process is a process of acquiring one or more secondary signals from the source signal to identify the first peak included in the main signal. Details regarding the secondary signals are as described above, so we will omit further explanation.

[0063] [2.3. First Peak Identification Process] The first peak identification step involves calculating an assumed boundary range in which the first peak is expected to appear based on the secondary signal, and identifying the largest peak that appears within the assumed boundary range of the main signal as the first peak. The method for calculating the assumed delimiter range is not particularly limited, and the most suitable method can be selected depending on the type of secondary signal.

[0064] [2.3.1. Specific Example 1] For example, if the main signal is the output signal of the cutter motor provided in the cutting device 20, the assumed delimiter range can be calculated by using the position signal of the carriage device 40 and the feed rate signal of the feed device 30 as sub-signals.

[0065] As described above, in the initial state, the carriage device 40 is waiting at the position furthest from the cutting device 20. When the carriage device 40 receives the first bar 12 from the exit guide device 60, the carriage device 40 moves toward the cutting device 20 and waits at the position closest to the cutting device 20 until the receipt of the first bar 12 is complete. Furthermore, once the receipt of the first bar 12 is complete, the carriage device 40 quickly moves back to its initial position and hands the bar 12 over to the exit pinch device 70. After that, it waits at the initial position in preparation for the transport of the second bar 12.

[0066] Typically, the tip of the second bar 12 (i.e., the butt joint of the bar 12) passes the cutting device 20 while the carriage device 40 is in the closest position to the cutting device 20. Furthermore, the shortest distance between the cutter head 24 and the carriage device 40 is known. Therefore, knowing the position of the carriage device 40 and the feed speed of the bar 12, it is possible to estimate the assumed delimiter range (the time range in which the butt joint of the bar 12 is estimated to have passed the cutting device 20). In this case, the error range of the assumed delimiter range can be selected to an optimal value depending on the purpose.

[0067] When the butt joint of the bar material 12 passes through the cutting device 20, the load on the cutting tool decreases instantaneously, and the output signal of the cutter motor also decreases instantaneously. Therefore, the largest decrease in the output signal that appears within the assumed boundary range can be identified as the first peak.

[0068] Figure 2 shows a schematic diagram illustrating the method for identifying the first peak using the cutter motor output signal, the carriage device position signal, and the feed rate signal. Note that the horizontal axis in Figure 2 represents the number of data samples, which is synonymous with time. Furthermore, the carriage device 40 is (a) A step of waiting at the position furthest from the cutting device 20, (b) Steps of moving toward the cutting device 20, (c) A step of waiting at the position closest to the cutting device 20, (d) Step of moving toward the exit pinch device 70 This is repeated at predetermined time intervals. The time at which the carriage device 40 begins moving toward the cutting device 20, and the time at which the carriage device 40 begins moving toward the exit pinch device 70, can be predetermined if the length of the bar material 12 and the feed speed are known.

[0069] Alternatively, the time at which the carriage device 40 begins to move may be determined according to the position information of the bar material 12 and the estimated feed speed. For example, the position information of the bar material 12 can be obtained by installing a material detector (not shown) upstream of the feed device 30 and detecting the front and rear ends of the bar material 12. The time at which the carriage device 40 begins to move toward the cutting device 20 can be determined using the time at which the material detector detects the rear end of the rod 12. The time at which the carriage device 40 begins moving toward the exit pinch device 70 can be determined using the time at which the rear end of the rod 12 passes the first feed roller 22a (calculated using an estimated value of the feed speed).

[0070] First, at point A in Figure 2, the rise in rotational speed of the pinch roller motor provided in the exit pinch device 70 is detected. The detected signal becomes a preliminary signal indicating that processing has started. The preliminary signal is used as a prerequisite (flag) for subsequent processing. Specifically, if the preliminary signal is "true", the subsequent processing is performed; if the preliminary signal is "false", the subsequent processing is not performed. Next, the point at which the actual feed rate of the bar material 12 by the feed device 30 closely matches the set value (point B in Figure 2) is defined as the "processing start position".

[0071] Next, the rising position of the carriage device 40 (point C in Figure 2, the time when the carriage device 40 is closest to the cutter head 24) and the falling position (point D in Figure 2, the time when the carriage device 40 starts moving toward the exit pinch device 70) are obtained. The number of rods 12 passing through the peeling device 10 can be determined by the number of rising positions of the carriage device 40 (the number of points C in Figure 2).

[0072] The method for identifying points C and D from the position signals of the carriage device 40, which are output moment by moment, is not particularly limited, and the most suitable method can be selected depending on the purpose. Here, d[i] is denoted as the value of the position signal of the carriage device 40 at time [i], that is, the distance between the initial position of the carriage device 40 and its position at time [i]. In this case, one way to identify point C is, for example, to identify time [i-1] as point C if the following three conditions are met. (a) d[i-1] exceeds a threshold (e.g., 200 mm), (b) d[i-1] is greater than d[i-2], and (c) d[i] is equal to d[i-1]. Another method for identifying point D is to identify time [j-1] as point D if the following two conditions are met. (a) Point C is determined (carriage rise flag is "true"), and, (b) d[j] is less than d[j-1].

[0073] Next, the assumed delimiter range (range E in Figure 2) is calculated from the rising position of the carriage device 40 (point C in Figure 2) and the actual feed rate. The intended delimiter range is, specifically, (a) Based on the rising position of the carriage device 40, the shortest distance between the cutter head 24 and the carriage device 40, and the feed rate of the feed roller, the time (assumed delimiter position) at which the butt joint of the bar material 12 is expected to pass through the cutting device 20 is calculated. (b) Calculate the lower limit time of the assumed division range by subtracting the error from the assumed division position. (c) Calculate the upper limit of the assumed boundary range by adding an error to the assumed boundary position. This can be determined by [meaning].

[0074] The expected delimiter position can be calculated specifically using the following formula (1). Assumed delimiter position = t c +L min / v …(1) however, t c This is the time of the rising position (point C) of the carriage device 40. L min The shortest distance between the cutter head 24 and the carriage device 40 is v is the feed rate of the feed roller. L min Since this is known, t c If we know v, we can calculate the expected delimiter position. The error can be set to an optimal value depending on the purpose. For example, the error is the shortest distance L between the cutter head 24 and the carriage device 40 under the condition of a given feed rate. min This can be defined as "the time required for a length equivalent to 1.5% of the length to pass through the cutting device 20."

[0075] Furthermore, the largest output drop within the assumed delimiter range (point F in Figure 2) is determined to be the butt joint of the bar stocks. Point F in Figure 2 is both the "end of processing" position for the first bar stock 12 and the "start of processing" position for the second bar stock 12.

[0076] Furthermore, in Figure 2, a decrease in cutter motor output (point G) is observed outside the assumed delimiter range E. Since point G is outside the assumed delimiter range, it is clear that point G is not the first peak caused by the butt joint of the bar material 12 passing through the cutting device 20. Therefore, point G is, (a) The first peak caused by the butt joint of the bar material 12 passing through a part other than the cutting device 20, (b) A second peak caused by noise, or (c) Third peak caused by processing abnormalities It can be presumed that it is one of the following:

[0077] [2.3.2. Specific Example 2] For example, if the main signal is the acceleration signal from an accelerometer installed in the feed device 30, the assumed delimiter range can be calculated by using the rotation speed of the motor for the inlet roller provided in the inlet guide device 50 as the secondary signal.

[0078] When the butt joints of the bar material 12 reach directly above and below the entrance guide roller of the entrance guide device 50, the entrance guide roller momentarily slips, and its rotational speed increases instantaneously. Therefore, assuming that the feed rate of the bar material 12 is constant, it is possible to estimate the time range (i.e., the assumed interval) in which the acceleration signal from the accelerometer is expected to increase sharply, from the time when the rotational speed of the entrance guide roller increases sharply.

[0079] Alternatively, instead of assuming that the feed rate of the bar material 12 is constant, the actual feed rate of the bar material 12 may be obtained, and the assumed delimiter range may be calculated from the time when the rotation speed of the inlet guide roller increased sharply and the actual feed rate. However, the distance between the accelerometer installed in the feed device 30 and the inlet guide roller is known, and the inlet guide device 50 is positioned close to the feed device 30. Therefore, even if the actual feed rate of the bar stock 12 increases or decreases for each bar stock 12, a large error will not occur if we assume that the feed rate is constant.

[0080] Figure 3 shows a schematic diagram illustrating a method for identifying the first peak using the acceleration signal from an accelerometer installed in the feed device and the rotational speed signal from the inlet motor provided in the inlet guide device. In Figure 3, the horizontal axis represents time. Figure 3 also shows the state after the phase alignment of each signal has been performed after identifying the first peak.

[0081] First, an accelerometer is installed near the first feed rollers 22a, 22a or the second feed rollers 22b, 22b of the feed device 30. In this state, if the inlet guide device 50 is operated without operating the feed device 30, the accelerometer will detect vibration (point A in Figure 3). Subsequently, when the inlet guide device 50 is stopped, the acceleration signal becomes noise level.

[0082] When the feed device 30 and the inlet guide device 50 are activated, a relatively large vibration occurs when the butt joint of the bar material 12 passes through the feed roller (point B in Figure 3). On the other hand, when the butt joint of the bar material 12 passes the entrance guide roller of the entrance guide device 50, the entrance guide roller momentarily spins freely, and the rotation speed of the entrance roller motor increases instantaneously (point C in Figure 3). Therefore, from the time at point C, it is possible to calculate the assumed interval in which the first peak is expected to appear in the acceleration signal.

[0083] Furthermore, in Figure 3, a peak other than the first peak (point B) is observed in the acceleration signal (point D in Figure 3). Since point D is outside the assumed boundary range, it is clear that point D is not the first peak caused by the butt joint of the rod material 12 passing through the feed device 30. Therefore, point D is, (a) The first peak caused by the butt joint of the rod 12 passing through a part other than the feed device 30, (b) A second peak caused by noise, or (c) Third peak caused by processing abnormalities It can be presumed that it is one of the following:

[0084] In the example shown in Figure 3, in addition to the acceleration signal and the rotation speed signal of the inlet roller motor, the output signal of the cutter motor provided in the cutting device 20 is also illustrated. The cutter motor output signal shows a peak (point F) that originates from the butt joint of the bar material 12 passing through the cutting device 20. Since the phases of point F and point D coincide, it can be estimated that point D, which appeared in the acceleration signal, is a vibration caused by the vibration generated when the butt joint of the bar material 12 passed through the cutting device 20 reaching the acceleration sensor installed in the feed device 30 via the inlet guide device 50 (i.e., the first peak caused by the butt joint of the bar material 12 passing through a part other than the feed device 30).

[0085] [3. Effect] Of the source signals output from the peeling device, the main signal is: (a) Change in amplitude (first peak) caused by the butt joint of the rod passing through any part of the peeling device, (b) Amplitude changes due to noise (second peak), and (c) If a processing abnormality occurs during the processing of the bar material, the change in amplitude (third peak) caused by the processing abnormality. It includes. Therefore, in order to determine processing abnormalities using the main signal, it is necessary to identify the first peak contained in the main signal and remove the first peak from the main signal.

[0086] However, since the end faces of each bar material continuously supplied to the peeling device are not necessarily perpendicular to the axial direction, the magnitude of the first peak is usually not constant. Therefore, in a method that identifies a peak whose amplitude exceeds a threshold as the first peak, the accuracy of identifying the first peak may decrease. Furthermore, if processing abnormalities are determined using a source signal in which the first peak has not been sufficiently identified, there is a risk of misidentifying the first peak as the third peak. In addition, if the first peak is misidentified as the second peak, it may become difficult to identify the bar material in which the processing abnormality occurred because the position of the butt joint of the bar material cannot be determined.

[0087] In contrast, by acquiring the main signal and sub-signal from the source signal, the sub-signal can be used to calculate the expected boundary range in which the first peak is expected to appear. Once the expected boundary range is known, the largest peak appearing within the expected boundary range of the main signal can be identified as the first peak. Using this method, the first peak can be accurately identified even if its magnitude fluctuates due to unforeseen circumstances. Furthermore, by using the main signal in which the first peak has been accurately identified to determine machining abnormalities, the accuracy of the machining abnormality determination and the accuracy of identifying the bar material in which the machining abnormality occurred are improved.

[0088] Although embodiments of the present invention have been described in detail above, the present invention is not limited in any way to the above embodiments, and various modifications are possible without departing from the spirit of the present invention. [Industrial applicability]

[0089] The peeling apparatus according to the present invention can be used for peeling various steel materials such as stainless steel for semiconductors and stainless steel for automobiles.

Claims

1. A peeling device having the following configuration: (1) The peeling apparatus is A cutting device for cutting the outer surface of a bar material, A feed device for continuously supplying a plurality of the aforementioned rod materials to the cutting device, A carriage device for transporting the rod material discharged from the cutting device to the downstream side, An inlet guide device for guiding the rod material supplied from the feed device to the machining center of the cutting device, An outlet guide device for guiding the rod material discharged from the cutting device to the carriage device, An exit pinch device for pulling the rod material conveyed by the carriage device to the downstream side, A control device for controlling the cutting device, the feed device, the carriage device, the inlet guide device, the outlet guide device, and the outlet pinch device. It is equipped with. (2) The control device is A main signal acquisition device acquires a main signal from the source signals output from the cutting device, the feed device, the carriage device, the inlet guide device, the outlet guide device, and the outlet pinch device, which includes a first peak caused by the butt joint of the bar passing through any part of the peeling device, a second peak caused by noise, and, if a processing abnormality occurs during the processing of the bar, a third peak caused by the processing abnormality. A sub-signal acquisition device that acquires one or more sub-signals from the source signal to identify the first peak included in the main signal, A first peak identification device calculates an assumed boundary range in which the first peak is expected to appear based on the sub-signal, and identifies the largest peak appearing within the assumed boundary range of the main signal as the first peak. It is equipped with.

2. The main signal is the output signal of the cutter motor provided in the cutting device. The aforementioned sub-signals are the position signal of the carriage device and the feed rate signal of the feed device. The peeling apparatus according to claim 1.

3. The feed device further includes an accelerometer installed therein, The main signal is the acceleration signal from the accelerometer. The aforementioned sub-signal is the rotation speed signal of the motor for the entrance roller provided in the entrance guide device. The peeling apparatus according to claim 1.

4. (A) A cutting device for cutting the outer surface of a bar material, A feed device for continuously supplying a plurality of the aforementioned rod materials to the cutting device, A carriage device for transporting the rod material discharged from the cutting device to the downstream side, An inlet guide device for guiding the rod material supplied from the feed device to the machining center of the cutting device, An outlet guide device for guiding the rod material discharged from the cutting device to the carriage device, An exit pinch device for pulling the rod material conveyed by the carriage device to the downstream side, A main signal acquisition step is to acquire a main signal from the source signal output from a peeling device equipped with a first peak caused by the butt joint of the rod passing through any part of the peeling device, a second peak caused by noise, and, if a processing abnormality occurs during processing of the rod, a third peak caused by the processing abnormality. (B) A sub-signal acquisition step of acquiring one or more sub-signals from the source signal to identify the first peak included in the main signal, (C) A first peak identification step which involves calculating an assumed boundary range in which the first peak is expected to appear based on the sub-signal, and identifying the largest peak that appears within the assumed boundary range of the main signal as the first peak. A signal processing method equipped with [a specific feature / feature].

5. The main signal is the output signal of the cutter motor provided in the cutting device. The aforementioned sub-signals are the position signal of the carriage device and the feed rate signal of the feed device. The signal processing method according to claim 4.

6. The peeling device further comprises an accelerometer installed in the feed device, The main signal is the acceleration signal from the accelerometer. The aforementioned sub-signal is the rotation speed signal of the motor for the entrance roller provided in the entrance guide device. The signal processing method according to claim 4.

Images