TWI855508B - Thread processing machine monitoring system and monitoring method - Google Patents

Abstract

A thread processing machine monitoring system and monitoring method. The control unit is based on a processing file transmitted from the input unit, and the processing file has taken into account the machine rigidity and servo control of the processing machine. The control unit sends the first control command according to the first sensing signal sent from the first sensor, and sends the second control command according to the second sensing signal sent from the second sensor. The first control command and the second control command are respectively transmitted to the first driving device and the second driving device, so as to control the first driving device or the second driving device to perform corresponding actions to the workpiece. Thread processing, thereby judging whether the current thread processing process of the workpiece is abnormal.

Description

Thread processing machine monitoring system and monitoring method thereof

The present invention relates to the field of thread processing, and in particular to a thread processing diagnosis and monitoring system and a monitoring method thereof.

Machine tools generally require the use of thread processing technology, but there are many types of thread processing problems, and different solutions will be used for different causes. Generally, once the end customer encounters a thread processing problem that cannot be solved, the manufacturer will need to send personnel to assist, or provide online support, but it often requires both parties to spend a lot of time and manpower costs.

On the other hand, different machines have different solutions to thread processing problems, which usually rely heavily on the user's past processing experience.

Among them, patent CN111479653A discloses a method for automatic diagnosis of thread turning, which continuously calculates thread error through the actual spindle speed and feed shaft speed to obtain a thread error curve, and analyzes the error cause based on the thread error curve. However, patent CN111479653A can only solve the thread abnormal process problem of specific thread processing by capturing the two pieces of information of spindle speed and feed shaft speed during thread processing. On the other hand, the patent can only analyze the cause of the problem, but cannot solve the problem through automatic adjustment.

The purpose of the present invention is to provide a thread processing diagnosis monitoring system and a monitoring method thereof, so that the system can analyze the current thread processing problem phenomenon, summarize the problem and the cause of the problem, and automatically adjust according to the cause of the problem, thereby greatly reducing the time, manpower and communication costs of problem investigation.

Another object of the present invention is to provide a thread processing diagnostic monitoring system and a monitoring method thereof, which increases the thread processing problem diagnostic function by using a CNC control device, and refers to the processing file, tool axis encoder, and workpiece axis encoder to analyze the problem and provide solutions according to different thread processing problem phenomena, and can also automatically adjust the stroke parameters according to the problem, greatly reducing the time for problem investigation.

In order to achieve the above-mentioned purpose, the present invention provides a thread processing machine monitoring system, which is applied to a thread processing machine, including: a first driving device coupled to a first sensor; a second driving device coupled to a second sensor; a control unit coupled to the first driving device, the second driving device, the first sensor, the second sensor and an input unit; the control unit performs thread processing on a workpiece according to a processing file transmitted by the input unit, and the processing file has taken into account a machine rigidity and a servo control of the processing machine. The control unit issues a first control command and a second control command according to a first sensing signal transmitted from the first sensor and a second sensing signal transmitted from the second sensor, and transmits the first control command and the second control command to the first driving device and the second driving device respectively, so as to control the first driving device and the second driving device to perform corresponding actions, thereby determining whether an abnormality occurs in the current thread processing process of the workpiece.

The present invention provides a thread processing machine monitoring method, which is applied to the monitoring method of a workpiece controlled by the processing machine through the first driving device and the second driving device for thread processing, comprising: the control unit is based on the processing file transmitted by the input unit, and the processing file has taken into account the machine rigidity and servo control of the processing machine; the control unit issues the first control command according to the first sensing signal transmitted by the first sensor, and issues the second control command according to the second sensing signal transmitted by the second sensor. The first control command and the second control command are transmitted to the first driving device and the second driving device respectively to control the first driving device or the second driving device to perform corresponding actions to perform thread processing on the workpiece, thereby determining whether the current thread processing process of the workpiece is abnormal.

Compared to the prior art, the present invention uses the control unit to analyze and provide solutions to different thread processing problems based on the processing file transmitted by the input unit, which has taken into account the machine rigidity and servo control of the processing machine; and can also automatically adjust the motion parameters based on the processing file, workpiece axis information, and tool axis information. Among them, the processing file is a processing instruction generated by considering the machine performance and servo control, and the workpiece axis information and tool axis information can be converted into speed and position by encoder signals. The control unit will automatically perform corresponding detection processes for the thread processing problems encountered by the user, and provide the user with corresponding solutions and can also perform automatic adjustments, which can greatly reduce processing time and labor costs.

The following will describe in detail various embodiments of the present invention, and will be illustrated with accompanying drawings. In addition to these detailed descriptions, the present invention can also be widely implemented in other embodiments, and any easy replacement, modification, and equivalent changes of the embodiments are included in the scope of the present invention and are subject to the scope of the patent application. In the description of the specification, many specific details are provided to enable readers to have a more complete understanding of the present invention; however, the present invention may still be implemented on the premise of omitting some or all of the specific details. In addition, well-known steps or components are not described in the details to avoid unnecessary limitations on the present invention. The same or similar components in the drawings will be represented by the same or similar symbols. It should be noted that the drawings are for illustration purposes only and do not represent the actual size or quantity of components. Some details may not be fully drawn for the sake of simplicity.

Please refer to FIG1, which is a block diagram of the thread processing machine monitoring system of the present invention. The present invention is a thread processing machine monitoring system, which is applied to a thread processing machine. In practice, the thread processing machine monitoring system at least includes: a first drive device 100 coupled to a first sensor 110; a second drive device 200 coupled to a second sensor 210. In practice, the first drive device 100 can be a tool shaft motor, and the first sensor 110 is a tool shaft encoder; the second drive device 200 can be a workpiece shaft motor, and the second sensor 210 is a workpiece shaft encoder.

A control unit 300 is coupled to the first driving device 100, the second driving device 200, the first sensor 110, the second sensor 210 and an input unit 400. In practical applications, the control unit 300 may be a controller of the processing machine, and the input unit 400 is not limited to an input method, and may be an input interface on the processing machine or an external device (such as a laptop).

In practice, the control unit 300 performs thread processing on a workpiece using a processing file 410 transmitted from the input unit 400. The processing file 410 has taken into account a machine rigidity and a servo control of the processing machine. The machine rigidity includes the static rigidity of the machine (the ability of the machine to resist deformation under external force) or the dynamic rigidity of the machine (the vibration response of the machine under external force). The servo control includes not only the stroke parameters of the machine (such as motor speed, motor moving speed, back-off angle parameters or back-off length parameters, etc.) or the servo parameters of the machine (current, speed, position control loop related parameters), but also servo delay or command delay or communication delay. The control unit 300 issues a first control command 301 and a second control command 302 according to a first sensing signal 111 transmitted from the first sensor 110 and a second sensing signal 211 transmitted from the second sensor 210 (the first sensing signal 111 is the tool axis position, and the second sensing signal 211 is the workpiece axis position), and transmits the first control command 301 and the second control command 302 to the first drive device 100 and the second drive device 200 respectively, so as to control the first drive device 100 and the second drive device 200 to perform corresponding actions, thereby determining whether an abnormality occurs in the current thread processing process of the workpiece.

In practice, the thread processing machine monitoring method of the present invention is that the control unit 300 issues the first control command 301 according to the first sensing signal 111 transmitted from the first sensor 110 and the second control command 302 according to the second sensing signal 211 transmitted from the second sensor 210 based on the processing file 410 transmitted from the input unit 400, and the processing file 410 has taken into account the machine rigidity and servo control of the processing machine. The first control command 301 and the second control command 302 are transmitted to the first driving device 100 and the second driving device 200 respectively to control the first driving device 100 or the second driving device 200 to perform corresponding actions to perform threading on the workpiece, thereby determining whether the current threading process of the workpiece is abnormal.

Please refer to FIG. 2 for a schematic diagram of the thread processing cycle. The cutting cycle of the thread processing process, taking the thread processing as an example, the relationship between the tool and the workpiece is: point A (tool starting point), point B (thread processing starting point), point C (tail back starting point (tool back starting point)), point D (middle point), point E (end point), point F (thread starting point). To determine whether the processing process is abnormal, the implementation description will use these points and whether the points are abnormal as the thread processing problem diagnosis process of this case. For the thread processing problem phenomenon encountered by the user, the control unit 300 will automatically perform the corresponding detection process and provide the user with a corresponding solution.

In practical application, please refer to FIG. 3 . When the control unit does not receive the first sensing signal 111 or the second sensing signal 211, it means that the thread processing process has an unexpected interruption (e.g., stuck during processing). At this time, the control unit 300 will issue a third control command 303 or a fourth control command 304 to the first drive device 100 or the second drive device 200 to drive the first drive device 100 or the second drive device 200, thereby determining whether the hardware wiring of the thread processing machine monitoring system is normal.

When the first drive device 100 or the second drive device 200 does not perform the corresponding action according to the third control command 303 or the fourth control command 304, it means that the hardware wiring is abnormal, and the control unit 300 will send a warning signal, which can be displayed on the aforementioned input unit 400 or on an external warning device. In this embodiment, the control unit 300 of the present invention can check the thread processing problem caused by the abnormal wiring (such as: falling off or damaged) of the first drive device 100 (tool shaft motor) or the second drive device 200 (workpiece shaft motor) and warn the user.

When the first drive device 100 or the second drive device 200 performs the corresponding action according to the third control command 303 or the fourth control command 304, it means that the hardware wiring is normal, so the thread processing process may be interrupted unexpectedly by the user due to the unreasonable rotation speed of the first drive device 100 or the second drive device 200. In this embodiment, the control unit 300 calculates the rotation speed of the first drive device 100 or the second drive device 200 within an operating range, and then the first drive device 100 or the second drive device 300 performs processing at the adjusted rotation speed according to the third control command 303 or the fourth control command 304 issued by the control unit 300. When the control unit 300 calculates that the speed of the first drive device 100 or the second drive device 200 is not within the operating range, the control unit 300 will send a warning signal. In the present invention, the speed operating range of the first drive device 100 or the second drive device 200 usually varies according to the type of motor, and the present invention has no special limitation on this.

Referring to FIG. 2 and FIG. 4 , in determining whether the front end of the thread is irregular during the threading process, when the control unit 300 receives a threading starting point (point B) and a thread starting point (point F), a first driving current 101 transmitted from the first driving device 100 or a second driving current 201 transmitted from the second driving device 200, the control unit 300 calculates a first load according to the first driving current 101. The control unit 300 calculates a first load rate or a second load rate according to the second driving current 201; the control unit 300 calculates a first distance between the thread processing starting point (point B) and the thread starting point (point F) during processing by using the variation data of the first load rate or the second load rate, and the control unit 300 compares the first distance with a preset distance between the thread processing starting point (point B) and the thread starting point (point F) in the processing file 410. In the present invention, the user can adjust the preset distance according to the actual processing situation.

When the control unit 300 determines that the first distance is less than or greater than the preset distance, the control unit issues a fifth control command 305 or a sixth control command 306 to control the first drive device 100 or the second drive device 200 until the difference between the first distance and the preset distance is within an error range. In the present invention, the user can adjust the error range according to the actual processing situation. In an ideal situation, the difference between the first distance and the preset distance will be within the error range. However, when the difference between the first distance and the preset distance is not within the error range, it means that the thread processing machine may have component wear (such as motor belt wear or screw wear). Therefore, the thread front end may have regular abnormalities during the thread processing process.

Please refer to FIG. 2 and FIG. 5 again. In determining whether the rear end of the thread has an abnormal application during the thread processing (after the backing start point C), the control unit 300 learns the position of the backing start point (point C) under a normal processing state according to the processing file 410, and controls the first drive device 100 or the second drive device 200 to determine whether the backing start point (point C) has an abnormal application. The control unit 300 determines whether the backing start point (point C) has an abnormal application during the thread processing (after the backing start point C). 3 respectively calculates a third load rate or a fourth load rate; and the control unit 300 learns the position of the tail-retraction starting point (point C) of an actual processing state from the first sensing signal 111, that is, the X-axis starts to move or the Z-axis speed is zero, and calculates a fifth load rate or a sixth load rate according to a fifth driving current 105 or a sixth driving current 205 of the first driving device 100 or the second driving device 200 at that time.

When the control unit 300 determines that the difference between the fifth load rate or the sixth load rate of the actual processing state and the third load rate or the fourth load rate of the normal processing state is outside a first range, the control unit issues a seventh control command 307 or an eighth control command 308 to drive the first drive device 100 or the second drive device 200 to adjust The rotation speed, moving speed, or retraction length (retraction length) parameter, or retraction angle (retraction angle) parameter, or acceleration/deceleration time parameter of the first driving device 100 or the second driving device 200 is adjusted to reduce the fifth load rate or the sixth load rate at the retraction starting point (point C) of the actual processing state. In the present invention, the user can adjust the first range according to the actual situation.

Furthermore, when the control unit 300 issues the seventh control command 307 or the eighth control command 308 to drive the first drive device 100 or the second drive device 200 to adjust the rotation speed, movement speed, back-off length parameter, back-off angle parameter, or acceleration/deceleration time parameter of the first drive device 100 or the second drive device 200 and none of them can reduce the fifth load rate or the sixth load rate under the actual processing state, the control unit 300 will issue a warning signal.

Please refer to FIG. 2 and FIG. 6 again, in determining whether there is an abnormal implementation application in the thread processing process (between the thread starting point F and the back-off starting point C), the control unit 300 learns the positions of the thread starting point (point F) and the back-off starting point (point C) in a normal processing state from the processing file 410, and according to the position of the thread starting point (point F) to the back-off starting point (point C) in the normal processing state, a seventh driving current 107 or an eighth driving current 207 of the first driving device 100 or the second driving device 200 respectively calculates a seventh load rate or an eighth load rate; Furthermore, when the control unit 300 changes from the screw thread starting point (point F) to the back-off starting point (point C) in an actual processing state, a ninth driving current 109 or a tenth driving current 209 of the first driving device 100 or the second driving device 200 respectively calculates a ninth load factor or a tenth load factor; thereby, the control unit 300 calculates the position of the screw thread starting point (point F) in the actual processing state by the change of the ninth load factor or the tenth load factor, and the control unit 300 obtains the position of the back-off starting point (point C) in the actual processing state from the first sensing signal 111.

When the control unit 300 determines that the difference between the ninth load rate or the tenth load rate and the seventh load rate or the eighth load rate is outside a second range, the control unit 300 adjusts the processing instructions in the processing file 410 and issues a corresponding ninth control command 309 or a tenth control command 310 to drive the first drive device 100 or the second drive device 200, thereby reducing the ninth load rate or the tenth load rate of the actual processing state.

Furthermore, when the control unit 300 adjusts the processing instructions in the processing file 410 and issues the corresponding ninth control command 309 or the tenth control command 310 to drive the first driving device 100 or the second driving device 200, and fails to reduce the ninth load rate or the tenth load rate of the actual processing state, the control unit 300 will issue a warning signal.

In practical applications, when the aforementioned load rate changes abnormally during the actual processing, the control unit 300 can also determine whether the processing tool has an abnormality based on the tool information of the processing tool (such as tool type, tool material). For example, damage or excessive wear of the tool will cause the load rate to be abnormal. The tool information allows the control unit 300 to more accurately determine the cause of the abnormal load rate change.

Please refer to FIG. 7 again. In the implementation application of the thread processing machine monitoring system of the present case (the implementation method is explained based on the embodiment shown in FIG. 1), the control unit 300 can be further coupled to a visual detection device 500, such as an image capture device, CCD, camera, etc., to monitor abnormalities in the thread processing process by visual means. The visual monitoring method using the visual detection device 500 has the following advantages: 1. It can improve the accuracy of judging the positions of point A (tool starting point), point B (thread processing starting point), point C (tail back starting point), point D (middle point), point E (end point), and point F (screw starting point) in the thread processing cycle; 2. It can detect whether the tool setting method is incorrect, for example, whether the position of the tool tip and the processing surface is as expected; 3. It can detect whether the workpiece or tool is clamped abnormally, such as unstable or mismatched.

In the implementation of the thread processing machine monitoring system of this case, the first drive device 100 is further provided with a vibration sensor 600, such as an accelerometer, for optimizing the detection of excessive vibration during thread processing. In practice, the vibration sensor 600 can be attached to the tool shaft of the first drive device 100, and the control unit 300 detects abnormal vibration during thread processing according to the signal sent by the vibration sensor 600. The main function of the vibration sensor 600 is to replace the aforementioned load rate. For example, the front control unit 300 calculates a first load rate based on the first driving current 101. In practice, if the vibration value emitted by the vibration sensor 600 is used instead, the control unit 300 can determine the distance between the two points (the first distance) by the vibration values of the thread processing starting point (point B) and the thread starting point (point F).

In the implementation of the thread processing machine monitoring system of this case, the control unit 300 is further connected to a remote storage monitoring device 700 through the Internet to synchronize and store the monitoring status of the processing machine. In the implementation, the remote storage monitoring device 700 can be a server host for storing monitoring data of multiple thread processing machines, or a remote computer for non-site operators to make monitoring records, so that remote users or monitors can synchronously understand the processing status, and when abnormalities are detected during the processing process, they can give warnings or other corresponding actions. If there is manually adjusted data, the relevant processing information and the adjusted optimal parameters can be uploaded to the remote storage monitoring device 700 in the cloud as a database for other similar problems in the future.

Please refer to FIG. 8 again. In the implementation of the thread processing machine monitoring system of the present invention, the first driving device 100 and the second driving device 200 are further coupled to a third sensor 120 and a fourth sensor 220 respectively. The control unit 300 determines whether the first driving device 100 is in operation according to the first sensing signal 111 and a third sensing signal 121 transmitted from the third sensor 120. The control unit 300 determines whether a first transmission belt of the second driving device 200 (practically, a transmission belt driven by the tool shaft motor to drive the tool shaft) is abnormal, or the control unit 300 determines whether a second transmission belt of the second driving device 200 (practically, a transmission belt driven by the workpiece shaft motor to drive the workpiece shaft) is abnormal based on the second sensing signal 211 and a fourth sensing signal 221 transmitted by the fourth sensor 220.

In practice, the control unit 300 calculates the slip ratio of the first transmission belt according to the angular displacement signal (first sensing signal 111) of the motor of the first driving device 100 and the angular displacement signal (third sensing signal 121) of the tool shaft, and the calculation method is as follows:

In addition, the control unit 300 calculates the accumulated slip distance of the first transmission belt according to the following formula:

The control unit 300 calculates the slip ratio of the second transmission belt according to the angular displacement signal (second sensing signal 211) of the motor of the second driving device 200 and the angular displacement signal (fourth sensing signal 221) of the workpiece shaft. The calculation method is as follows:

In addition, the control unit 300 calculates the accumulated slip distance of the second transmission belt according to the following formula:

In further applications, the control unit 300 can also calculate the slip ratio change rate based on the differential of the slip ratio with respect to time, and calculate the slip cumulative distance change rate based on the differential of the slip cumulative distance with respect to time. Through the slip ratio, the slip cumulative distance, the slip ratio change rate, and the slip cumulative distance change rate, the belt transmission abnormality of the entire thread processing abnormality in the thread abnormality can be checked. When any of the slip ratio, the slip cumulative distance, the slip ratio change rate, and the slip cumulative distance change rate exceeds the tolerance range, the control unit 300 sends a warning signal to ask the user to check.

In terms of overall technology, this case technically refers to the processing file, tool axis encoder, and workpiece axis encoder. The machine rigidity and servo control are considered in the processing file, and the processing machine does not need to be installed with additional sensors (only the originally configured tool axis encoder and workpiece axis encoder are required). The control unit can automatically check all problems in thread processing, analyze problems and provide solutions based on different thread processing problem phenomena, and can also automatically adjust the motion parameters according to the problem phenomena. In this way, by adding the thread processing problem diagnosis function to the CNC control unit, the system will analyze the current thread processing problem phenomenon, summarize the problem and the cause of the problem, and automatically adjust according to the cause of the problem. This can greatly reduce the time, manpower and communication costs of problem investigation.

The above disclosed embodiments are merely illustrative of the principles, features and effects of the present invention, and are not intended to limit the scope of the present invention. Any person skilled in the art may modify and alter the above embodiments without violating the spirit and scope of the present invention. Any equivalent changes and modifications made using the contents disclosed in the present invention shall still be covered by the scope of the patent application below.

100: first drive device 101: first drive current 103: third drive current 105: fifth drive current 107: seventh drive current 109: ninth drive current 110: first sensor 111: first sensing signal 120: third sensor and 121: third sensing signal 200: second drive device 201: second drive current 203: fourth drive current 205: sixth drive current 207: eighth drive current 209: tenth drive current 210: second sensor 211: second sensing signal 220: fourth sensor 221: fourth sensing signal 300: Control unit 301: First control command 302: Second control command 303: Third control command 304: Fourth control command 305: Fifth control command 306: Sixth control command 307: Seventh control command 308: Eighth control command 309: Ninth control command 310: Tenth control command 400: Input unit 410: Processing file 500: Visual detection device 600: Vibration sensor 700: Remote storage monitoring device Point A: Tool starting point Point B: Thread processing starting point Point C: Tail back starting point Point D: Middle point Point E: End point Point F: Screw thread starting point

[Figure 1] is a block diagram of the monitoring system of the thread processing machine in this case. [Figure 2] is a schematic diagram of the thread processing cycle. [Figure 3] is a block diagram of the monitoring system of the thread processing machine in this case. [Figure 4] is a block diagram of the monitoring system of the thread processing machine in this case. [Figure 5] is a block diagram of the monitoring system of the thread processing machine in this case. [Figure 6] is a block diagram of the monitoring system of the thread processing machine in this case. [Figure 7] is a block diagram of the monitoring system of the thread processing machine in this case. [Figure 8] is a block diagram of the monitoring system of the thread processing machine in this case.

100: First drive device 110: First sensor 111: First sensing signal 200: Second drive device 210: Second sensor 211: Second sensing signal 300: Control unit 301: First control command 302: Second control command 400: Input unit 410: Processing file

Claims (32)

A thread processing machine monitoring system is applied to a thread processing machine, comprising: a first driving device coupled to a first sensor; a second driving device coupled to a second sensor; a control unit coupled to the first driving device, the second driving device, the first sensor, the second sensor and an input unit; the control unit performs thread processing on a workpiece according to a processing file transmitted by the input unit, and the processing file has taken into account a machine rigidity and a servo control of the processing machine; the control unit issues a first control command and a second control command according to a first sensing signal transmitted by the first sensor and a second sensing signal transmitted by the second sensor, and transmits the first control command and the second control command to the first sensor, respectively. The control unit obtains the position of the back-off starting point under a normal processing state according to the processing file, and calculates a third load rate or a fourth load rate according to a third drive current or a fourth drive current of the first drive device or the second drive device at the back-off starting point; and the control unit obtains the position of the back-off starting point under a normal processing state according to the processing file, and calculates a third load rate or a fourth load rate according to a third drive current or a fourth drive current of the first drive device or the second drive device at the back-off starting point; and the control unit obtains the position of the back-off starting point under a normal processing state according to the processing file, and calculates the position of the back-off starting point under a normal processing state according to the third drive current or the fourth drive current of the first drive device or the second drive device at the back-off starting point; and the control unit obtains the position of the back-off starting point under a normal processing state according to the processing file, and calculate ... The position of the tail-retraction starting point of an actual processing state is determined, and a fifth load rate or a sixth load rate is calculated according to a fifth drive current or a sixth drive current of the first drive device or the second drive device at that time, so as to control the first drive device and the second drive device to perform corresponding actions, thereby judging whether the current thread processing process of the workpiece is abnormal. The threading machine monitoring system as described in claim 1, wherein when the control unit does not receive the first sensing signal or the second sensing signal, it indicates that an unexpected interruption has occurred in the threading process, and the control unit will issue a third control command or a fourth control command to the first drive device or the second drive device to drive the first drive device or the second drive device, thereby determining whether the hardware wiring of the threading machine monitoring system is normal; when the first drive device or the second drive device does not perform the corresponding action according to the third control command or the fourth control command, the control unit will issue a warning signal. The thread processing machine monitoring system as described in claim 1, wherein when the control unit does not receive the first sensing signal or the second sensing signal, the control unit will issue a third control command or a fourth control command to the first driving device or the second driving device to drive the first driving device or the second driving device, thereby determining whether the thread processing machine monitoring system is in operation or not. Whether the system hardware wiring is normal; when the first drive device or the second drive device performs the corresponding action according to the third control command or the fourth control command, the control unit will calculate the speed of the first drive device or the second drive device within an operating range, and then the first drive device or the second drive device will perform processing according to the speed adjusted by the control unit. The threading machine monitoring system as described in claim 3, wherein when the control unit calculates that the rotation speed of the first drive device or the second drive device is not within the operating range, the control unit will issue a warning signal. The thread processing machine monitoring system as described in claim 1, wherein the control unit receives a thread processing starting point and a thread starting point, a first driving current transmitted from the first driving device or a second driving current transmitted from the second driving device, and the control unit calculates a first load rate according to the first driving current or a second load rate according to the second driving current; the control unit calculates a first distance between the thread processing starting point and the thread starting point during processing by using the variation data of the first load rate or the second load rate, and the control unit compares the first distance with a preset distance between the thread processing starting point and the thread starting point in the processing file. A threading machine monitoring system as described in claim 5, wherein when the control unit determines that the first distance is less than or greater than the preset distance, the control unit issues a fifth control command or a sixth control command to control the first drive device or the second drive device until the difference between the first distance and the preset distance is within an error range. The thread processing machine monitoring system as described in claim 1, wherein when the control unit determines that the difference between the fifth load rate or the sixth load rate of the actual processing state and the third load rate or the fourth load rate of the normal processing state is outside a first range, the control unit drives the first drive device or the second drive device by issuing a seventh control command or an eighth control command to adjust the rotation speed, movement speed, or tail-off length parameter, or tail-off angle parameter, or acceleration/deceleration time parameter of the first drive device or the second drive device, thereby reducing the fifth load rate or the sixth load rate of the actual processing state at the tail-off starting point. The thread processing machine monitoring system as described in claim 7, wherein the control unit issues the seventh control command or the eighth control command to drive the first drive device or the second drive device to adjust the rotation speed, movement speed, or tail-off length parameter, or tail-off angle parameter, or acceleration/deceleration time parameter of the first drive device or the second drive device. When the fifth load rate or the sixth load rate under the actual processing state cannot be reduced, the control unit will issue a warning signal. The thread processing machine monitoring system as described in claim 1, wherein the control unit learns the positions of the thread starting point and the tail back starting point under a normal processing state from the processing file, and calculates a seventh load rate or an eighth load rate respectively according to a seventh drive current or an eighth drive current of the first drive device or the second drive device at the position from the thread starting point to the tail back starting point under the normal processing state; and the control unit calculates a seventh load rate or an eighth load rate from an actual processing When the state is from the starting point of the screw thread to the starting point of the back-off, a ninth driving current or a tenth driving current of the first driving device or the second driving device respectively calculates a ninth load rate or a tenth load rate; thereby, the control unit calculates the position of the starting point of the screw thread in the actual processing state by the change of the ninth load rate or the tenth load rate, and the control unit learns the position of the back-off starting point in the actual processing state from the first sensing signal. The thread processing machine monitoring system as described in claim 9, wherein when the control unit determines that the difference between the ninth load rate or the tenth load rate and the seventh load rate or the eighth load rate is outside a second range, the control unit adjusts the processing instructions in the processing file and issues a corresponding ninth control command or a tenth control command to drive the first drive device or the second drive device, thereby reducing the ninth load rate or the tenth load rate of the actual processing state. As described in claim 10, the thread processing machine monitoring system, wherein when the control unit adjusts the processing instructions in the processing file and issues the corresponding ninth control command or the tenth control command to drive the first drive device or the second drive device, and fails to reduce the ninth load rate or the tenth load rate of the actual processing state, the control unit will issue a warning signal. A thread processing machine monitoring system as described in claim 1, wherein the control unit is coupled to a visual detection device for monitoring abnormalities in the thread processing process. The threading machine monitoring system as described in claim 1, wherein the first drive device is provided with a vibration sensor, and the control unit detects vibration abnormalities during the threading process based on the signal emitted by the vibration sensor. The thread processing machine monitoring system as described in claim 1, wherein the control unit is further connected to a remote storage monitoring device via the Internet to synchronize and store the monitoring status of the processing machine. The thread processing machine monitoring system as described in claim 1, wherein the first drive device and the second drive device are respectively coupled to a third sensor and a fourth sensor, and the control unit determines whether a first transmission belt of the first drive device is abnormal according to the first sensing signal and a third sensing signal transmitted by the third sensor, or the control unit determines whether a second transmission belt of the second drive device is abnormal according to the second sensing signal and a fourth sensing signal transmitted by the fourth sensor. A thread processing machine monitoring system as described in claim 1, 5 or 9, wherein when the load rate changes abnormally during the actual processing, the control unit determines whether an abnormality occurs in the processing tool based on the tool information of the processing tool. A thread processing machine monitoring method is applied to a monitoring method for a workpiece controlled by a processing machine through a first driving device and a second driving device for thread processing, comprising: a control unit based on a processing file transmitted by an input unit, the processing file has taken into account a machine rigidity and a servo control of the processing machine; the control unit issues a first control command based on a first sensing signal transmitted by a first sensor coupled to the first driving device, and issues a second control command based on a second sensing signal transmitted by a second sensor coupled to the second driving device; the control unit learns the position of a tail retraction start point under a normal processing state according to the processing file, and the first driving device sends a second control command according to the position of the tail retraction start point. A third driving current or a fourth driving current of the first driving device or the second driving device is used to calculate a third load rate or a fourth load rate respectively; and the control unit learns the position of the tail-retraction starting point of an actual processing state from the first sensing signal, and calculates a fifth load rate or a sixth load rate according to a fifth driving current or a sixth driving current of the first driving device or the second driving device at that time; The first control command and the second control command are respectively transmitted to the first driving device and the second driving device to control the first driving device or the second driving device to perform corresponding actions to perform thread processing on the workpiece, thereby judging whether the current thread processing process of the workpiece is abnormal. The threading machine monitoring method as described in claim 17, wherein when the control unit does not receive the first sensing signal or the second sensing signal, it indicates that an unexpected interruption has occurred in the threading process, and the control unit will issue a third control command or a fourth control command to the first drive device or the second drive device to drive the first drive device or the second drive device, thereby determining whether the hardware wiring of the threading machine monitoring system is normal; when the first drive device or the second drive device does not perform the corresponding action according to the third control command or the fourth control command, the control unit will issue a warning signal. The thread processing machine monitoring method as described in claim 17, wherein when the control unit does not receive the first sensing signal or the second sensing signal within a second time, the control unit will issue a third control command or a fourth control command to the first driving device or the second driving device to drive the first driving device or the second driving device, thereby determining whether the thread processing machine is in operation or not. Whether the hardware wiring of the monitoring system is normal; when the first drive device or the second drive device performs the corresponding action according to the third control command or the fourth control command, the control unit will calculate the speed of the first drive device or the second drive device within an operating range, and then the first drive device or the second drive device will perform processing according to the speed adjusted by the control unit. The thread processing machine monitoring method as described in claim 19, wherein when the control unit calculates that the rotation speed of the first drive device or the second drive device is not within the operating range, the control unit will issue a warning signal. A thread processing machine monitoring method as described in claim 17, wherein, when the thread processing program is at a thread processing starting point and a thread starting point, the control unit calculates a first load rate or a second load rate through a first drive current transmitted by the first drive device or a second drive current transmitted by the second drive device; the control unit calculates a first distance between the thread processing starting point and the thread starting point during processing through the change data of the first load rate or the second load rate, and the control unit compares the first distance with a preset distance between the thread processing starting point and the thread starting point in the processing file. A thread processing machine monitoring method as described in claim 21, wherein when the control unit determines that the first distance is less than or greater than the preset distance, the control unit issues a fifth control command or a sixth control command to control the first drive device or the second drive device until the difference between the first distance and the preset distance is within an error range. The thread processing machine monitoring method as described in claim 17, wherein when the control unit determines that the difference between the fifth load rate or the sixth load rate of the actual processing state and the third load rate or the fourth load rate of the normal processing state is outside a first range, the control unit issues a seventh control command or an eighth control command to drive the first drive device or the second drive device to adjust the rotation speed, or movement speed, or tail-off length parameter, or tail-off angle parameter, or acceleration/deceleration time parameter of the first drive device or the second drive device, thereby reducing the fifth load rate or the sixth load rate of the actual processing state at the tail-off starting point. The thread processing machine monitoring method as described in claim 23, wherein the control unit issues the seventh control command or the eighth control command to drive the first drive device or the second drive device to adjust the rotation speed, movement speed, or tail-out length parameter, or tail-out angle parameter, or acceleration/deceleration time parameter of the first drive device or the second drive device. When the actual processing state is at the tail-out starting point position and the fifth load rate or the sixth load rate cannot be reduced, the control unit will issue a warning signal. The thread processing machine monitoring method as described in claim 17, wherein the control unit learns the positions of the thread starting point and the tail back starting point under a normal processing state from the processing file, and calculates a seventh load rate or an eighth load rate respectively according to a seventh drive current or an eighth drive current of the first drive device or the second drive device at the position from the thread starting point to the tail back starting point under the normal processing state; and the control unit calculates a seventh load rate or an eighth load rate by an actual increase When the working state is from the starting point of the thread to the starting point of the back-off, a ninth driving current or a tenth driving current of the first driving device or the second driving device respectively calculates a ninth load rate or a tenth load rate; thereby, the control unit calculates the position of the starting point of the thread in the actual processing state by the change of the ninth load rate or the tenth load rate, and the control unit learns the position of the back-off starting point in the actual processing state from the first sensing signal. A thread processing machine monitoring method as described in claim 25, wherein when the control unit determines that the difference between the ninth load rate or the tenth load rate and the seventh load rate or the eighth load rate is outside a second range, the control unit adjusts the processing instructions in the processing file and issues a corresponding ninth control command or a tenth control command to drive the first drive device or the second drive device, thereby reducing the ninth load rate or the tenth load rate of the actual processing state. As described in claim 26, the thread processing machine monitoring method, wherein when the control unit adjusts the processing instructions in the processing file and issues the corresponding ninth control command or the tenth control command to drive the first drive device or the second drive device, and fails to reduce the ninth load rate or the tenth load rate of the actual processing state, the control unit will issue a warning signal. The thread processing machine monitoring method as described in claim 17, wherein the control unit is coupled to a visual detection device to monitor abnormalities in the thread processing process through visual detection. The threading machine monitoring method as described in claim 17, wherein the first drive device is provided with a vibration sensor, and the control unit detects vibration abnormalities during the threading process based on the signal emitted by the vibration sensor. The thread processing machine monitoring method as described in claim 17, wherein the control unit is further connected to a remote storage monitoring device via the Internet to synchronize and store the monitoring status of the processing machine. The thread processing machine monitoring method as described in claim 18, wherein the first drive device and the second drive device are respectively coupled to a third sensor and a fourth sensor, and the control unit determines whether a first transmission belt of the first drive device is abnormal according to the first sensing signal and a third sensing signal transmitted by the third sensor, or the control unit determines whether a second transmission belt of the second drive device is abnormal according to the second sensing signal. A thread processing machine monitoring method as described in claim 17, 21 or 25, wherein when the load rate changes abnormally during the actual processing, the control unit determines whether an abnormality occurs in the processing tool based on the tool information of the processing tool.