TW202146154A - Thread processing chip breaking control system and the control method thereof - Google Patents

Abstract

A thread processing chip breaking control system is provided, which includes a control module, a driver, a first swing axis and a second swing axis. The control module includes a command receiving unit, a chip breaking unit, and a path planning unit. The command receiving unit calculates a movement command according to a processing command and a processing condition. The chip breaking unit calculates swing amplitude and a swing frequency according to the processing condition and a machine performance. The path planning unit calculates a swing movement command according to the movement command, the swing amplitude and the swing frequency. The driver receives the swing movement command. The control module control the driver to drive the first swing axis and the second swing axis simultaneously according to the swing movement command to carry out the thread processing chip breaking process for a workpiece.

Description

Threading chip breaking control system and control method

The present invention relates to the technical field of numerical control, in particular to a chip breaking control system for thread machining and a control method thereof.

During the cutting process of the machine tool, the chips will wrap around the tool or the workpiece, causing scratches on the workpiece or damage to the tool. Therefore, the user will turn on the chip breaking function of the machine tool according to the actual processing situation, so as to avoid the generation of excessively long chips and affect the processing quality.

The existing thread cutting chip breaking technology usually encounters the following problems: (1) The user needs to set at least one set of parameters most suitable for the processing situation to perform the thread cutting chip breaking function according to the actual processing parameters. (2) Because the rigidity of each machine is different, even if the same machining conditions are set, the effect of chip breaking may not be the same.

On the other hand, in the existing threading chip breaking process, most of the tools break chips in a single direction. As shown in FIG. 1A , the component symbol 100 is the workpiece, the component symbol 102 is the tool, and the X direction is the cutting direction of the tool 102 , and the Y direction is the vibration direction of the tool 102, so the tool 102 only performs the threading chip breaking process in the X direction, but the disadvantage is that heat will be generated during the threading chip breaking process, and the thermal stress at high temperature will make the tool 102 produces damage. Therefore, in order to avoid the situation where the contact area between the threading tool 102 and the workpiece 100 increases as the depth increases, which leads to the tool breaking, an equal-area threading process is mostly used, as shown in FIG. 1B . In FIG. 1B , the reference numeral 1002 represents the thread on the workpiece 100 , the upper right of the figure represents the equal-area threading process with single-side feed, and the lower-right of the figure represents the equal-area threading process with left and right feeds. However, whether it is a single-side feed or left-right feed and other area threading processes, the user needs to set a large swing amplitude to obtain a good chip breaking effect, which is likely to cause problems such as poor thread quality and surface finish of the workpiece.

In order to improve the above problems, the main purpose of the present invention is to provide a threading chip breaking control system and a control method thereof. The numerical control device automatically calculates the swing amplitude and the swing frequency according to the current machining conditions, machining conditions and machine performance. The machine operator only needs to turn on this function in the processing area where this function is used, and does not need to set any parameters, and does not need to adjust the chip breaking cutting parameters according to each processing condition or different machine, greatly reducing the Improve user friendliness and precisely control the quality of chip breaking.

Another object of the present invention is to provide a threading chip breaking control system and a control method thereof, which utilizes the simultaneous swinging of two axes, and only requires a very small amount of The swing amount can achieve a very stable chip breaking effect, and the very small swing amount can make the thread processing quality better and have a good surface finish, and the screw of the machine does not need to be back and forth due to a large range. Swing to reduce the loss of the screw.

According to the above object, the present invention discloses a threading chip breaking control system, comprising: a control module, a driver, a first swing shaft and a second swing shaft, wherein the driver is respectively connected with the control module, the first swing shaft and the second swing shaft connect. The control module includes: a command receiving unit, a chip breaking unit and a path planning unit, the command receiving unit receives at least one processing command, at least one processing condition and at least one machine performance, and the command receiving unit calculates the movement command according to the processing command and processing conditions ;The chip breaking unit receives the machining conditions and machine performance transmitted by the command receiving unit, and the chip breaking unit calculates the swing amplitude and swing frequency according to the machining conditions and machine performance; the path planning unit receives the movement command calculated by the command receiving unit , and receive the swing amplitude and the swing frequency calculated by the chip breaking unit, and the path planning unit calculates the swing movement command according to the movement command, the swing amplitude and the swing frequency. The drive receives the wobble movement command transmitted by the path planning unit. The control module controls the driver to simultaneously drive the first swing shaft and the second swing shaft according to the swing movement command to perform the thread machining chip breaking process on the workpiece.

In a preferred embodiment of the present invention, the chip breaking unit sets the swing frequency reference interval according to the performance of the machine, and the chip breaking unit compares the swing frequency reference interval with the swing frequency. When the swing frequency is not included in the swing frequency reference interval, Then the chip breaking unit is recalculated according to the machining conditions and machine performance to obtain another oscillation frequency.

In a preferred embodiment of the present invention, the chip breaking unit sets the swing amplitude reference interval according to the performance of the machine, and the chip breaking unit compares the swing amplitude with the swing amplitude reference interval. When the swing amplitude is not included in the swing amplitude reference interval, Then the chip breaking unit is recalculated according to the machining conditions and machine performance to obtain another oscillation amplitude.

In a preferred embodiment of the present invention, the control module further includes a memory unit to receive and store the processing conditions and machine performance input by the user.

In a preferred embodiment of the present invention, the memory unit further includes and stores at least one resonance frequency range. When the swing frequency is included in the resonance frequency range, the chip breaking unit recalculates according to the processing conditions and machine performance to obtain another resonance frequency range. Swing frequency.

In a preferred embodiment of the present invention, the first swing shaft and the second swing shaft are respectively connected to the swing unit, the swing unit includes a main shaft and/or a feed shaft, and the processing conditions include the rotational speed of the main shaft and the feed of the feed shaft Velocity and at least one workpiece feature of the workpiece, machine performance including speed loop gain, speed loop integral time constant and/or position loop gain and workpiece feature including shape, size and/or at least material properties of the workpiece.

In a preferred embodiment of the present invention, the first swing shaft and the second swing shaft are connected to the main shaft and/or the feed shaft, and the driver drives the first swing shaft and the second swing shaft simultaneously according to the swing movement command.

In a preferred embodiment of the present invention, the chip breaking unit calculates the swing amplitude according to the rotational speed, the feed speed, the speed loop gain and the speed loop integral time constant, and the chip breaking unit calculates the swing amplitude according to the rotational speed, the feed speed, the workpiece characteristics, and the speed loop gain. The oscillating frequency is calculated by integrating the time constant with the speed loop.

In a preferred embodiment of the present invention, the chip breaking unit further calculates the first swing amplitude according to the rotational speed, the feed speed, the speed loop gain, the integral time constant of the speed loop and the position loop gain, and the chip breaking unit further calculates the first swing amplitude according to the rotational speed, the feed The first swing frequency is obtained by calculating the speed, workpiece characteristics, speed loop gain, speed loop integral time constant and position loop gain.

In a preferred embodiment of the present invention, the workpiece will generate a first chip breaking amount at a first time in the threading chip breaking process, and a second chip breaking amount will be generated at a second time, and the first chip breaking amount is the same as the second chip breaking amount The chip breaking amount is included in the tolerance range.

In a preferred embodiment of the present invention, the workpiece is subjected to the chip breaking process at the third time in the threading chip breaking process according to the third swing amplitude and the third swing frequency, and the workpiece is in the fourth time in the thread machining chip breaking process. The time is based on the fourth swing amplitude and the fourth swing frequency to perform the threading chip breaking process, and the third swing amplitude is greater than the fourth swing amplitude, and the third swing frequency is smaller than the fourth swing frequency, wherein the swing unit moves at the third time. The third machining distance is smaller than the fourth machining distance moved at the fourth time.

In a preferred embodiment of the present invention, the oscillating unit moves along the first flank of the workpiece during the chip breaking process of threading.

In a preferred embodiment of the present invention, the swing unit moves along the first flank of the workpiece and moves staggeredly with the second flank during the threading chip breaking process.

In a preferred embodiment of the present invention, the path planning unit further includes: receiving a feedback value of the first swing axis and the second swing axis for threading and chip breaking process of the workpiece; comparing the feedback value with the swing movement command to generate a feedback value give a movement command; calculate a swing feedback movement command according to the feedback movement command, the second movement command, the second swing amplitude and the second swing frequency; and simultaneously drive the first swing shaft and the second swing shaft pair according to the swing feedback movement command The workpiece is subjected to thread machining chip breaking process compensation, wherein the occurrence time of the movement command is earlier than the occurrence time of the second movement command.

In addition, the present invention further discloses a threading chip breaking control method, the steps of which include: starting a threading chip breaking process in a machining interval; receiving a machining command, at least one machining condition and at least one machine performance; calculating according to the machining command and the machining condition Move command; calculate swing amplitude and swing frequency according to processing conditions and machine performance; calculate swing movement command according to movement command, swing amplitude and swing frequency; and control the driver to drive the first swing axis and the second swing axis simultaneously according to the swing movement command In order to perform threading chip breaking process on the workpiece.

In a preferred embodiment of the present invention, the method for controlling chip breaking in threading further includes setting a reference interval of the wobble frequency according to the performance of the machine, and comparing the wobble frequency with the reference interval of the wobble frequency. When the wobble frequency is not included in the reference interval of the wobble frequency within, then recalculate according to the processing conditions and machine performance to obtain another oscillation frequency.

In a preferred embodiment of the present invention, the method for controlling chip breaking in threading further includes setting a swing amplitude reference interval according to machine performance, and comparing the swing amplitude with the swing amplitude reference interval. When the swing amplitude is not included in the swing amplitude reference interval Inside, recalculate to obtain another swing amplitude according to processing conditions and machine performance.

In a preferred embodiment of the present invention, the processing conditions and machine performance are input by the user or stored in the memory unit.

In a preferred embodiment of the present invention, the method for controlling chip breaking in threading further includes storing at least one resonance frequency range in the memory unit, and when the swing frequency is included in the resonance frequency range, recalculate the calculation according to processing conditions and machine performance to get another swing frequency.

In a preferred embodiment of the present invention, the oscillating unit includes a main shaft and/or a feed shaft, the machining conditions include the rotational speed of the main shaft, the feed speed of the feeding shaft and at least one workpiece feature of the workpiece, and the oscillating unit and the first oscillating Shaft and second swing shaft connections and machine performance include velocity loop gain, velocity loop integral time constant and/or position loop gain, and workpiece characteristics include shape, size and/or at least material properties of the workpiece.

In a preferred embodiment of the present invention, the swing amplitude is calculated according to the rotation speed, feed rate, speed loop gain and speed loop integral time constant, and the swing frequency is calculated according to the rotation speed, feed speed, workpiece characteristics, speed loop gain and speed The loop integral time constant is calculated.

In a preferred embodiment of the present invention, the method for controlling chip breaking in threading further comprises calculating the first swing amplitude according to the rotational speed, the feed rate, the speed loop gain, the integral time constant of the speed loop and the position loop gain, and further according to the rotational speed, The first swing frequency is obtained by calculating the feed speed, workpiece characteristics, speed loop gain, speed loop integral time constant and position loop gain.

In a preferred embodiment of the present invention, the workpiece will generate the first chip breaking amount at the first time in the threading chip breaking process, and will generate the second chip breaking amount at the second time, and the first chip breaking amount is the same as the second chip breaking amount. Both chip breaking amounts are included in the tolerance range.

In a preferred embodiment of the present invention, the workpiece is subjected to the threading chip-breaking process at the third time in the threading chip-breaking process according to the third swing amplitude and the third swing frequency, and the workpiece is in the threading chip-breaking process at the third time. The chip breaking process of thread machining is performed according to the fourth swing amplitude and the fourth swing frequency for four times, and the third swing amplitude is greater than the fourth swing amplitude, and the third swing frequency is smaller than the fourth swing frequency, wherein the swing unit moves at the third time. The third machining distance of is smaller than the fourth machining distance moved at the fourth time.

In a preferred embodiment of the present invention, the first swing shaft and the second swing shaft are connected to the main shaft and/or the feed shaft, and the driver drives the first swing shaft and the second swing shaft simultaneously according to the swing movement command.

In a preferred embodiment of the present invention, the method for controlling chip breaking in threading further comprises: respectively receiving feedback values of the first swing axis and the second swing axis for thread machining chip breaking process on the workpiece; comparing the feedback value with the swing movement command to generate a feedback movement command; calculate the swing feedback movement command according to the feedback movement command, the second movement command, the second swing amplitude and the second swing frequency; and control the driver to simultaneously drive the first swing according to the swing feedback movement command The axis and the second swing axis perform thread machining chip breaking process compensation on the workpiece, wherein the occurrence time of the movement command is earlier than the occurrence time of the second movement command.

In a preferred embodiment of the present invention, the oscillating unit moves along the first flank of the workpiece during the chip breaking process of threading.

In a preferred embodiment of the present invention, the swing unit moves along the first flank of the workpiece and moves staggeredly with the second flank during the threading chip breaking process.

First, please refer to FIG. 2 and FIG. 3 . 2 is also described together with FIG. 3 , wherein FIG. 2 is a flow chart showing the steps of a threading chip breaking control method according to the technology disclosed in the present invention, and FIG. 3 shows a threading chip breaking control system. Schematic. In FIG. 2 , the steps of the method for controlling chip breaking in threading include: Step S10 : starting the chip breaking process in the machining interval. In this step, the user enables the chip breaking processing function on the host computer 2 according to the actual processing requirements, and the chip breaking processing function is the thread processing chip breaking process. Step S12: Receive a machining command, at least one machining condition and at least one machine performance. In this step, the command receiving unit 30 in the control module 3 receives the processing command, at least one processing condition and at least one machine performance transmitted by the host computer 2, wherein the definition of the processing command, processing conditions and machine performance will be in the A detailed description will be given later. It is worth noting that the machine performance can be obtained by the host computer 2 or built into the memory unit 36 of the control module 3 .

Next, step S14: Calculate the movement command according to the machining command and the machining conditions. In this step, the command receiving unit 30 calculates the movement command according to the processing command and processing conditions transmitted from the upper level. Before the processing machine performs chip breaking processing on the workpiece (not shown in the figure), the processing state of the workpiece, such as the size or depth of the cutting hole, needs to be obtained through the processing command of the host computer 2. Step S16: Calculate the swing amplitude and the swing frequency according to at least one processing condition and at least one machine performance. In this step, the chip breaking unit 32 calculates the swing amplitude and the swing frequency according to the processing conditions and machine performance transmitted from the upper computer 2 . In the present invention, the machine performance can be regarded as the rigidity of the processing machine, and mainly includes information such as velocity loop gain, velocity loop integral time constant, and/or position loop gain. Step S18: Calculate the wobble movement command according to the movement command, the wobble amplitude and the wobble frequency. In this step, the command receiving unit 30 is used to transmit the movement command to the path planning unit 34, the swing amplitude and the swing frequency are transmitted from the chip breaking unit 32 to the path planning unit 34, and then the path planning unit 34 according to the movement command, the swing amplitude and the path planning unit 34. The wobble frequency is used to calculate the wobble movement command.

Finally, in step S20 : according to the swing movement command, the first swing shaft and the second swing shaft are driven to perform a thread machining chip breaking process on the workpiece. In this step, the control module 3 can drive the driver 4 according to the swing movement command calculated by the path planning unit 34 in step S18 to control the first swing shaft 52 and the second swing shaft to simultaneously align the workpiece (not shown in the figure). Indicated in ) for threading chip breaking process. The functions of the above-mentioned host computer 2 , driver 3 , command receiving unit 30 , chip breaking unit 32 and path planning unit 34 will be described in detail later.

Next, please refer to FIG. 3 . Fig. 3 is a schematic diagram showing a chip breaking control system for threading. The threading chip breaking control system 1 at least includes: a host computer 2, a control module 3, a driver 4, a first swing shaft 52 and a second swing shaft 54, wherein the control module 3 is respectively connected with the host computer 2 and the driver 4, and the driver 4 is connected to the first swing shaft 52 and the second swing shaft 54, and the driver 4 drives the first swing shaft 52 and the second swing shaft 54 at the same time. In the embodiment of the present invention, the host computer 2 may be a controller of a processing machine (not shown in the figure), a desktop computer, a notebook computer, a smart phone or a remote server, etc., and the host computer 2 It is connected with the control module 3 through wired or wireless means.

The control module 3 at least includes a command receiving unit 30, a chip breaking unit 32, a path planning unit 34 and a memory unit 36, wherein the command receiving unit 30 receives the processing command, processing conditions and machine performance transmitted by the host computer 2, The command receiving unit 30 calculates the movement command according to the processing command and processing conditions, wherein the processing conditions include the rotational speed of the main shaft and the feed speed of the feed shaft, and transmits the calculated movement command to the path planning unit 34 . In addition, the command receiving unit 30 transmits the rotational speed of the main shaft, the feed speed of the feed axis, at least one workpiece feature of the workpiece, and machine performance to the chip breaking unit 32 in the machining conditions. In the present invention, the machining command refers to the machining state of the workpiece, that is, what shape the user wants to process the workpiece into. The workpiece characteristics of the workpiece include the shape, size and/or material properties of the workpiece; the machine performance includes velocity loop gain, velocity loop integral time constant and/or position loop gain.

The chip breaking unit 32 receives the rotational speed of the main shaft, the feed speed of the feed shaft, at least one workpiece feature of the workpiece and the machine performance in the machining conditions transmitted by the command receiving unit 30 to calculate the swing amplitude and swing of the swing unit 5 frequency. The swing amplitude is calculated by the chip breaking unit 32 according to the rotational speed of the main shaft, the feed speed of the feed shaft, the speed loop gain in the machine performance, and the speed loop integral constant. In addition, the oscillating frequency is calculated by the chip breaking unit 32 according to the speed loop gain and the speed loop integral time constant in the rotation speed of the main shaft, the feed speed of the feed axis, workpiece characteristics and machine performance. It is worth noting that the workpiece features in the machining conditions are the workpiece features of the workpiece at each stage of the chip breaking machining process.

In another embodiment of the present invention, the chip breaking unit 32 can calculate the first swing according to the rotational speed of the main shaft, the feed speed of the feed axis, the speed loop gain, the speed loop gain, the speed loop integral time constant and the position loop gain. In addition, the chip breaking unit 32 calculates the first oscillation frequency according to the rotational speed of the spindle, the feed speed of the feed axis, the workpiece characteristics, the speed loop gain, the speed loop integral time constant and the position loop gain. It is worth noting that, in the embodiment of the present invention, the chip breaking unit 32 also takes the position loop gain in the machine performance into consideration to calculate the first swing amplitude and the first swing frequency, which is an optimization method, which can improve the screw thread. The stability and precision of the chip breaking process.

Next, the chip breaking unit 32 transmits the wobble amplitude and wobble frequency obtained by the above calculation to the path planning unit 34, and the path planning unit 34 transmits the movement command sent by the command sending unit 30 and the wobble amplitude and the wobble amplitude sent by the chip breaking unit. The wobble frequency is used to calculate the wobble movement command. In another embodiment, the chip breaking unit 32 transmits the first wobble amplitude and the first wobble frequency to the path planning unit 34 . Similarly, the path planning unit 34 transmits the movement command sent by the command sending unit 30 and the chip breaking The first wobble movement command is calculated based on the first wobble amplitude and the first wobble frequency sent by the unit, so that the driver 4 receives the wobble movement command (or the first wobble movement command) sent by the path planning unit 34 in the control module 3 ), and according to the swing movement command (or the first swing movement command), the first swing unit 52 and the second swing unit 54 are simultaneously controlled to perform the threading chip breaking process on the workpiece (not shown in the figure).

In the embodiment of the present invention, the chip breaking unit 32 mainly sets the reference interval of the oscillation frequency according to the performance of the machine. In another embodiment, the reference interval of the oscillation frequency can also be set by the user. Next, the chip breaking unit 32 compares the swing frequency reference interval with the previously calculated swing frequency. When the swing frequency is not included in the swing frequency reference interval, the chip breaking unit 32 will recalculate another swing frequency included in the swing frequency reference interval. swing frequency. For example, when the swing frequency ( _{referred to as swing frequency f 1} ) calculated by the chip breaking unit 32 is smaller than the minimum value of the swing frequency reference interval ( _{referred to as swing frequency f A} ) or greater than the maximum value of the swing frequency reference interval ( When the wobble frequency f _{B is} called), that is, the wobble frequency f _{1 does} not fall within the wobble frequency reference interval, the chip breaking unit 32 will not directly _{output the calculated wobble frequency f 1} to the path planning unit 34, but according to the wobble frequency f 1 The frequency f _A and the wobble frequency f _{B calculate another wobble frequency (called wobble frequency f 2} ) included in the wobble frequency reference interval. The subsequent chip breaking unit 32 _{outputs the wobble frequency f 2} to the path planning unit 34 .

On the other hand, the chip breaking unit 32 mainly sets the swing amplitude reference interval according to the performance of the machine, and in another embodiment, it can also be set by the user. The chip breaking unit 32 compares the previously calculated swing amplitude with the swing amplitude reference interval. When the swing amplitude is not included in the swing amplitude reference interval (that is, the swing amplitude does not fall within the swing amplitude reference interval), the chip breaking unit 32 will Recalculate another wobble amplitude contained within the wobble amplitude reference interval. For example, when the swing amplitude calculated by the chip breaking unit 32 ( _{referred to as the swing amplitude h 1} ) is smaller than the minimum value of the swing amplitude reference interval ( _{referred to as the swing amplitude h A} ) or greater than the maximum value of the swing amplitude reference interval ( When the swing amplitude h _{B is} called), that is, the swing amplitude h _{1 does} not fall within the swing amplitude reference interval, the chip breaking unit 32 will not directly _{output the calculated swing amplitude h 1} to the path planning unit 34, but according to The swing amplitude h _A and the swing amplitude h _{B calculate another swing amplitude (referred to as the swing amplitude h 2} ) included in the swing amplitude reference interval, and the subsequent chip breaking unit 32 will _{output the swing amplitude h 2} to the path planning unit 34 .

The path planning unit 34 calculates the wobble movement command according to the movement command sent from the command receiving unit 30 and the wobble frequency and wobble amplitude sent from the chip breaking unit 32 . The driver 3 simultaneously controls the first swing shaft 52 and the second swing shaft 54 to perform the threading chip breaking process according to the swing movement command calculated by the path planning unit 34 .

The first swing shaft 52 and the second swing shaft 54 are respectively connected with a swing unit (not shown in the figure), wherein the swing unit includes a main shaft (not shown in the figure) and/or a feed shaft (not shown in the figure), Specifically, the first swing shaft and the second swing shaft are connected with the main shaft and/or the feed shaft, so when the swing unit is the feed shaft (corresponding to the tool or the workpiece according to the actual machining process), the feed shaft can Oscillate on any of the x, y or z axes. Among them, the feed axis can be oscillated on any two axes of the x, y or z axis according to the actual machining process to break chips during the machining process. For example, when the machining process is linear chip breaking, the feed axis can be oscillated in any two axes of x, y or z axis for chip breaking. In another embodiment, similarly, when the machining process is an oblique line or an arc, the feed axis can be oscillated in any two axes of the x, y or z axes to perform the thread machining chip breaking process. In other words, the first swing axis 52 and the second swing axis 54 may be any two axes among the x, y or z axes.

In another embodiment, when the oscillating unit is the spindle (corresponding to the tool or workpiece according to the actual machining process), the spindle can oscillate on the a, b or c axis, wherein the spindle can be oscillated in a, b or c according to the actual machining process It is the c-axis swing for chip breaking. In one embodiment, when the machining process is straight-line chip breaking, the spindle can be oscillated in any two axes a, b or c for chip breaking; in another embodiment, when the machining process is an oblique line or an arc , the spindle can also oscillate in any two axes of a, b or c for chip breaking processing. In other words, the first swing shaft 52 and the second swing shaft 54 may be any two of the a, b or c axes. In yet another embodiment, when the swing unit is the feed axis and the main shaft (corresponding to the tool or the workpiece according to the actual machining process), the feed axis can swing in any one of the x, y or z axes and the main shaft can swing in a , b or c axis swing to perform the chip breaking process. In other words, the first swing axis 52 may be any one of the x, y or z axes, and the second swing axis 54 may be any one of the a, b or c axes.

For example, the first swing shaft 52 and the second swing shaft 54 are respectively connected with the swing unit, and the swing unit will move along the first tooth surface of the workpiece to perform the threading chip breaking process. Specifically, the driver 4 will move according to the swing Command to control the first swing shaft 52 and the second swing shaft 54 at the same time to move the swing unit along the first tooth surface of the workpiece (not shown in the figure), that is, to perform the threading chip breaking process on the workpiece in a single-side feed mode . In another embodiment, the oscillating unit moves staggeredly along the first tooth surface and the second tooth surface of the workpiece to perform the threading chip-breaking process, that is, the threading chip-breaking process is performed on the workpiece by feeding left and right. In yet another embodiment, after the first swing shaft 52 and the second swing shaft 54 allow the swing unit to move along the first tooth surface of the workpiece, the swing unit will move alternately along the first tooth surface and the second tooth surface of the workpiece. , that is, the threading chip-breaking process is performed on the workpiece by a single-side feed, and then the threading chip-breaking process is performed by a left-right feed.

In the embodiment of the present invention, the control module 3 further includes a memory unit 36 for storing processing conditions, machine performance, reference interval of swing frequency, reference interval of swing amplitude and tolerance interval. Further, the memory unit 36 also stores a resonance frequency interval, when the breaker unit 32 calculates the frequency of the wobbling (wobbling frequency f ₃ referred to) comprising (i.e., the wobble frequency f at a predetermined resonant frequency bins falling within the resonator ₃ frequency range), it means that the vibration frequency generated by the first swing shaft 52 and the second swing shaft 54 during the threading chip breaking process will resonate with the machine (not shown in the figure), which will cause the threading to break. The chip process cannot be carried out smoothly, and it is easy to cause damage to the machine (not shown in the figure) and related parts due to resonance. At this time, the chip breaking unit 32 does not directly _{output the calculated swing frequency f 3} to the path planning unit 34 , but recalculates the swing frequency f ₄ avoiding all frequencies in the resonance frequency range, and the chip breaking unit 32 will subsequently The wobble frequency f _{4 is} output to the path planning unit 34 .

In an embodiment of the present invention, a chip breaking amount is generated during the threading chip breaking process of the workpiece. When the driver 4 simultaneously drives the first swing shaft 52 and the second swing shaft 54 to perform the threading chip breaking process on the workpiece according to the swing movement command, if the generated chip breaking amount is included in the tolerance interval, it means that the chip breaking unit 32 calculates The resulting oscillation frequency and oscillation amplitude can stabilize chip breaking. If the chip breaking amount is not included in the tolerance range, the user can decide whether the chip breaking unit 32 needs to recalculate the oscillation frequency and oscillation amplitude according to the actual machining conditions, so that the chip breaking process performed in different unit time will cause the breakage. The amount of chips should be included in the tolerance interval. In embodiments of the present invention, the amount of chip breaking may be by weight or volume. For example, the workpiece will generate the first chip breaking amount at the first time in the chip breaking process, and will generate the second chip breaking amount at the second time. When the weight of the first chip breaking amount and the second chip breaking amount or The volume is included in the tolerance range, which means that the chip breaking effect of the current machine (not shown in the figure) is stable.

In one embodiment, as the processing time of the workpiece is different, the oscillation frequency and the oscillation amplitude are also adjusted accordingly. Take the workpiece as a bar mounted on the spindle and the swing unit as a tool mounted on the feed shaft. In the chip breaking process, the tool will process from the outer diameter surface of the bar to the center of the bar. When the tool is at the third time (for example, the diameter of the bar is 50mm), it will perform the chip breaking process on the bar according to the third swing amplitude and the third swing frequency; when the tool is at the fourth time (for example, the diameter of the bar is 40mm), it will be processed according to the The fourth oscillating amplitude and the fourth oscillating frequency perform a chip breaking machining process on the bar. The third swing amplitude is greater than the fourth swing amplitude, the third swing frequency is smaller than the fourth swing frequency, and the third machining distance moved by the tool at the third time is smaller than the fourth machining distance moved at the fourth time.

In addition, the present invention compensates for the first swing shaft 52 and the second swing shaft 54 in the thread breaking process of the workpiece. The path planning unit 34 is mainly used to receive the feedback value when the first swing shaft 52 and the second swing shaft 54 perform the threading and chip breaking process on the workpiece (not shown in the figure), wherein the feedback value is encoded by the motor. generator (not shown in the figure). Then, the path planning unit 34 compares the oscillating movement command previously calculated by the chip breaking unit 32 according to the oscillating amplitude and the oscillating frequency according to the feedback value, to obtain the feedback movement command; then, the path planning unit 34 according to this Feedback movement command, movement command (second movement command), swing amplitude (second swing amplitude) and swing frequency (second swing frequency) to calculate the swing feedback movement command. It should be noted that the time point at which the movement command obtained in the next unit time occurs is later than the previously mentioned command received by the user through the host computer 2 from the control module 3 The generation time of the machining command input by the unit 30, the machining conditions and the machine performance, and the time point of the movement command calculated by the command receiving unit 30 according to the machining command. Finally, the control module 3 drives the first swing shaft 52 and the second swing shaft 54 at the same time according to the swing feedback movement command to compensate the workpiece (not shown in the figure) for threading breakage.

Steps S10-S20: flow chart of the steps of the control method for chip breaking in threading 1: Threading chip breaking control system 2: host computer 3: Control module 30: Command receiving unit 32: Chip breaking unit 34: Path Planning Unit 36: Memory Unit 4: Drive 52: The first swing axis 54: Second swing shaft

FIG. 1A is a schematic diagram showing a uniaxial vibration chip breaking process according to the prior art. FIG. 1B is a schematic diagram showing a chip breaking process of equal-area thread machining according to the prior art. FIG. 2 is a schematic flow chart showing the steps of a method for controlling chip breaking in threading according to the technology disclosed in the present invention. 3 is a block diagram illustrating a chip breaking control system for threading according to the disclosed technology.

1: Threading chip breaking control system

2: host computer

3: Control module

30: Command receiving unit

32: Chip breaking unit

34: Path Planning Unit

36: Memory Unit

4: Drive

52: The first swing axis

54: Second swing shaft

Claims (28)

A threading chip breaking control system, comprising: a control module, including: a command receiving unit for receiving at least one processing command, at least one processing condition and at least one machine performance, and the command receiving unit calculates a movement command according to the processing command and the processing condition; a chip breaking unit that receives the machining conditions and the machine performance transmitted by the command receiving unit, and the chip breaking unit calculates a swing amplitude and a swing frequency according to the machining conditions and the machine performance; and a path planning unit, receiving the movement command calculated by the command receiving unit, and receiving the wobble amplitude and the wobble frequency calculated by the chip breaking unit, and the path planning unit according to the movement command, the wobble amplitude and the the wobble frequency calculates a wobble movement command; a driver, connected with the control module, to receive the swing movement command transmitted by the path planning unit; and A first swing shaft and a second swing shaft are respectively connected with the driver, and the control module controls the driver to simultaneously drive the first swing shaft and the second swing shaft according to the swing movement command to perform thread machining on a workpiece Chip breaking process. The chip breaking control system for threading according to claim 1, wherein the chip breaking unit sets a reference interval of oscillation frequency according to the performance of the machine, and the chip breaking unit compares the reference interval of oscillation frequency with the oscillation frequency, when The wobble frequency is not included in the wobble frequency reference range, and the chip breaking unit recalculates according to the machining conditions and the performance of the machine to obtain another wobble frequency. The chip breaking control system for threading according to claim 1, wherein the chip breaking unit sets a swing amplitude reference interval according to the performance of the machine, and the chip breaker compares the swing amplitude with the swing amplitude reference interval, when The swing amplitude is not included in the swing amplitude reference interval, and the chip breaking unit recalculates according to the machining conditions and the machine performance to obtain another swing amplitude. The chip breaking control system for thread machining as claimed in claim 1, wherein the control module further comprises a memory unit for receiving and storing the machining conditions and the machine performance input by a user. The chip breaking control system for threading as claimed in claim 4, further comprising storing at least one resonance frequency range in the memory unit, and when the oscillation frequency is included in the resonance frequency range, the chip breaking unit is based on the processing conditions and The machine performance is recalculated to obtain another wobble frequency. The chip breaking control system for thread machining according to claim 1, wherein the first swing shaft and the second swing shaft are respectively connected with a swing unit, the swing unit includes a main shaft and/or a feed shaft, and the machining Conditions include a rotational speed of the spindle, a feed rate of the feed axis, and at least one workpiece feature of the workpiece, and the at least one machine performance includes a speed loop gain, a speed loop integral time constant, and/or a position loop Gain, the workpiece feature includes a shape, a dimension and/or at least one material property of the workpiece. The chip breaking control system for threading according to claim 6, wherein the first swing shaft and the second swing shaft are connected with the main shaft and/or the feed shaft, and the driver drives the first swing shaft simultaneously according to the swing movement command A swing shaft and the second swing shaft. The threading chip breaking control system of claim 1, wherein the chip breaking unit calculates the oscillation amplitude according to the rotational speed, the feed rate, the speed loop gain and the speed loop integral time constant, and the chip breaking unit calculates the oscillation amplitude according to the The rotational speed, the feed speed, the workpiece feature, the speed loop gain and the speed loop integral time constant are calculated to obtain the oscillating frequency. The threading chip breaking control system according to claim 1, wherein the chip breaking unit further calculates a first swing according to the rotational speed, the feed rate, the speed loop gain, the speed loop integral time constant and the position loop gain and the chip breaking unit calculates a first swing frequency according to the rotational speed, the feed speed, the workpiece feature, the speed loop gain, the speed loop integral time constant and the position loop gain. The threading chip breaking control system according to claim 1, wherein the workpiece generates a first chip breaking amount at a first time in the threading chip breaking process, and generates a second chip breaking at a second time The chip amount, the first chip breaking amount and the second chip breaking amount are all included in a tolerance interval. The threading chip breaking control system of claim 1, wherein the workpiece performs the chip breaking process according to a third oscillation amplitude and a third oscillation frequency at a third time in the threading chip breaking process, and The workpiece performs the threading chip breaking process at a fourth time in the threading chip breaking process according to a fourth swing amplitude and a fourth swing frequency, and the third swing amplitude is greater than the fourth swing amplitude, and the first swing amplitude is greater than the fourth swing amplitude. The third swing frequency is smaller than the fourth swing frequency, wherein a third processing distance moved by the swing unit at the third time is smaller than a fourth processing distance moved at the fourth time. The control system for threading chip breaking according to claim 6, wherein the swing unit moves along a first tooth surface of the workpiece during the threading chip breaking process. The threading chip breaking control system according to claim 6, wherein the swing unit moves along the first flank of the workpiece and moves alternately with a second flank during the threading chip breaking process. The thread processing chip breaking control system according to claim 1, wherein the path planning unit further comprises: receiving a feedback value of the threading chip breaking process performed on the workpiece by the first swing shaft and the second swing shaft; comparing the feedback value with the swing movement command to generate a feedback movement command; calculating a wobble feedback movement command according to the feedback movement command, a second movement command, a second wobble amplitude and a second wobble frequency; and The first swing axis and the second swing axis are simultaneously driven according to the swing feedback movement command to perform the threading chip breaking process compensation for the workpiece, wherein the movement command occurs earlier than the second movement command. point in time. A method for controlling chip breaking in threading, the steps of which include: Start a threading chip breaking process in a machining section; Receive a processing order, at least one processing condition and at least one machine performance; Calculate a movement command according to the processing command and the processing condition; Calculate a swing amplitude and a swing frequency according to the processing conditions and the machine performance; calculating a wobble movement command based on the movement command, the wobble amplitude and the wobble frequency; and A driver is controlled according to the swing movement command to simultaneously drive a first swing shaft and a second swing shaft to perform the threading chip breaking process on a workpiece. The method for controlling chip breaking in threading as claimed in claim 15, further comprising setting a swing frequency reference interval according to the machine performance, and comparing the swing frequency with the swing frequency reference interval, when the swing frequency is not included in the swing frequency Within the reference interval of the wobble frequency, recalculate according to the processing conditions and the performance of the machine to obtain another wobble frequency. The method for controlling chip breaking in threading according to claim 15, further comprising setting a swing amplitude reference interval according to the machine performance, and comparing the swing amplitude with the swing amplitude reference interval, when the swing amplitude is not included in the swing amplitude Within the reference range of the swing amplitude, recalculate according to the processing conditions and the performance of the machine to obtain another swing amplitude. The method for controlling chip breaking in threading as claimed in claim 15, wherein the machining conditions and the machine performance are input by a user or stored in a memory unit. The method for controlling chip breaking in threading as claimed in claim 18, further comprising storing at least one resonance frequency range in the memory unit, and when the oscillation frequency is included in the resonance frequency range, according to the processing conditions and the machine performance Recalculate to get another wobble frequency. The method for controlling chip breaking in threading according to claim 15, wherein the swing unit includes a main shaft and/or a feed shaft, and the machining conditions include a rotational speed of the main shaft, a feed speed of the feed shaft and the At least one workpiece feature of the workpiece, and the swing unit is connected to the first swing axis and the second swing axis and the machine performance includes a speed loop gain, a speed loop integral time constant and/or a position loop gain, the Workpiece characteristics include a shape, a dimension, and/or at least one material property of the workpiece. The control method for threading chip breaking according to claim 20, wherein the oscillation amplitude is calculated according to the rotational speed, the feed rate, the speed loop gain and the integral time constant of the speed loop, and the oscillation frequency is calculated according to the rotational speed , the feed speed, the workpiece feature, the speed loop gain and the speed loop integral time constant are calculated. The method for controlling chip breaking in threading according to claim 20, further comprising calculating a first swing amplitude according to the rotational speed, the feed rate, the speed loop gain, the speed loop integral time constant and the position loop gain, and Furthermore, a first swing frequency is calculated according to the rotational speed, the feed speed, the workpiece feature, the speed loop gain, the speed loop integral time constant and the position loop gain. The method for controlling threading chip breaking according to claim 15, wherein the workpiece generates a first amount of chip breaking at a first time in the threading chip breaking process, and generates a second chip breaking at a second time The chip amount, the first chip breaking amount and the second chip breaking amount are all included in a tolerance interval. The method for controlling threading chip breaking according to claim 15, wherein the workpiece performs the threading chip breaking process according to a third oscillation amplitude and a third oscillation frequency at a third time in the threading chip breaking process, And the workpiece performs the threading chip breaking process at a fourth time in the threading chip breaking process according to a fourth swing amplitude and a fourth swing frequency, and the third swing amplitude is greater than the fourth swing amplitude, the The third swing frequency is smaller than the fourth swing frequency, wherein a third machining distance moved by the swing unit at the third time is smaller than a fourth machining distance moved at the fourth time. The control method for threading chip breaking according to claim 20, wherein the first swing shaft and the second swing shaft are connected to the main shaft and/or the feed shaft, and the driver drives the first swing shaft simultaneously according to the swing movement command A swing shaft and the second swing shaft. The method for controlling chip breaking in threading according to claim 15, further comprising: respectively receiving a feedback value for the threading chip breaking process performed by the first swing shaft and the second swing shaft on the workpiece; comparing the feedback value with the swing movement command to generate a feedback movement command; calculating a wobble feedback movement command according to the feedback movement command, a second movement command, a second wobble amplitude and a second wobble frequency; and Control the driver to simultaneously drive the first swing shaft and the second swing shaft to perform the threading chip breaking process compensation on the workpiece according to the swing feedback movement command, wherein the movement command occurs earlier than the second movement The point in time when the command occurred. The control method for threading chip breaking according to claim 20, wherein the swing unit moves along a first tooth surface of the workpiece during the threading chip breaking process. The control method for threading chip breaking according to claim 27, wherein the swing unit moves along the first flank of the workpiece and moves alternately with a second flank during the threading chip breaking process.

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