TWI739469B - 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

Thread processing chip breaking control system and control method thereof

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

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

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

On the other hand, in the existing thread machining chip breaking process, most of the tools are broken in a single direction. As shown in Figure 1A, the component symbol 100 is the workpiece, the component symbol 102 is the tool, and the X direction is the cutting travel direction of the tool 102 , And the Y direction is the vibration direction of the tool 102, so the tool 102 can only perform the threading and chip-breaking process in the X-direction. 102 is damaged. Therefore, in order to avoid the situation that the contact area between the thread machining tool 102 and the workpiece 100 increases as the depth increases and the tool breaks, the equal-area thread machining process is usually used, as shown in FIG. 1B. In Figure 1B, the yuan The part symbol 1002 represents the thread on the workpiece 100. The upper right of the figure represents the single-side feed equal area threading process, and the lower right of the figure represents the left and right feed equal area threading process. However, whether it is a single-edge or left-right-feed and other area threading process, 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 of the workpiece and decreased surface finish.

In order to improve the above problems, the main purpose of the present invention is to provide a thread processing chip-breaking control system and its control method. The numerical control device automatically calculates the swing amplitude and swing frequency according to the current processing conditions, processing conditions and machine performance. The machine operator only needs to turn on this function in the processing interval that uses this function. There is no need to set any parameters, and there is no need to adjust the chip breaking cutting parameters according to each processing condition or different machines. Improve the user's operating friendliness and accurately control the quality of chip breaking.

Another object of the present invention is to provide a thread processing chip-breaking control system and its control method, which utilizes dual-axis simultaneous swinging, and in equal area thread processing (that is, single-sided and left-right infeed) cutting, only minimal The amount of swing can achieve a very stable chip breaking effect, and the extremely small amount of swing can also make the quality of thread processing and have a good surface finish, and the screw of the machine does not need to go back and forth because of a large amplitude. Swing to reduce the loss of the screw.

According to the above objective, the present invention discloses a thread processing chip breaking control system, comprising: a control module, a driver, and a first swing shaft and a second swing shaft, wherein the driver is connected to the control module and the first swing shaft and the second swing shaft, respectively 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 a movement command according to the processing command and the processing condition ; The chip breaking unit receives the processing conditions and machineability transmitted by the command receiving unit Yes, and the chip breaking unit calculates the swing amplitude and frequency according to the processing conditions and machine performance; the path planning unit receives the movement command calculated by the command receiving unit, and receives the swing amplitude and 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 driver receives the swing movement command transmitted by the path planning unit. The control module controls the driver to simultaneously drive the first swing axis and the second swing axis to perform threading and chip breaking processes on the workpiece according to the swing movement command.

In a preferred embodiment of the present invention, the chip breaking unit sets the swing frequency reference interval according to the machine performance, 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 recalculates according to the processing 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 machine performance, 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 recalculates according to the processing conditions and machine performance to obtain another swing 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 storing 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 Swing frequency.

In a preferred embodiment of the present invention, the first swing axis and the second swing axis are respectively connected to the swing unit, the swing unit includes a spindle and/or a feed axis, and the processing conditions include the speed of the spindle and the feed of the feed axis. Speed 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 features including the shape, size and/or at least material characteristics of the workpiece.

In a preferred embodiment of the present invention, the first swing axis and the second swing axis are connected to the main shaft and/or the feed axis, and the driver simultaneously drives the first swing axis and the second swing axis 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 speed, feed speed, speed loop gain, and speed loop integral time constant, and the chip breaking unit calculates the swing amplitude according to the speed, feed speed, workpiece characteristics, and speed loop gain. Calculate the swing frequency with the integral time constant of the speed loop.

In a preferred embodiment of the present invention, the chip breaking unit further calculates the first swing amplitude according to the speed, feed speed, speed loop gain, speed loop integral time constant, and position loop gain, and the chip breaking unit further calculates the first swing amplitude according to the speed and feed speed. Speed, workpiece characteristics, speed loop gain, speed loop integral time constant and position loop gain are calculated to obtain the first swing frequency.

In a preferred embodiment of the present invention, the workpiece will have a first chip breaking amount at the first time in the chip breaking process of thread machining, and a second chip breaking amount will be produced at the second time. The amount of chip breaking is included in the tolerance interval.

In a preferred embodiment of the present invention, the workpiece is in the thread machining chip breaking process at the third time according to the third oscillation amplitude and the third oscillation frequency to perform the chip breaking process, and the workpiece is in the fourth time of 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 less than the fourth swing frequency. 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 swing unit moves along the first tooth surface of the workpiece during the threading and chip breaking process.

In a preferred embodiment of the present invention, the swing unit moves along the first tooth surface and the second tooth surface of the workpiece in a staggered movement during the threading and chip breaking process.

In a preferred embodiment of the present invention, the path planning unit further includes: receiving the feedback value of the first swing axis and the second swing axis for the thread machining and chip breaking process of the workpiece; comparing the feedback value with the swing movement command to generate the feedback 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 simultaneously drive the first swing axis and the second swing axis pair according to the swing feedback movement command The workpiece is compensated for the chip-breaking process of thread machining, in which 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 thread processing chip breaking control method, the steps of which include: starting the thread processing chip breaking process in the processing interval; receiving processing commands, at least one processing condition, and at least one machine performance; calculating according to the processing commands and processing conditions Movement command; calculate the swing amplitude and frequency according to the processing conditions and machine performance; calculate the swing movement command according to the movement command, swing amplitude and frequency; and control the driver according to the swing movement command to simultaneously drive the first swing axis and the second swing axis In order to thread the workpiece and chip breaking process.

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

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 thread machining further includes storing at least one resonance frequency interval in the memory unit. When the oscillation frequency is included in the resonance frequency interval, recalculation is performed according to the processing conditions and machine performance. To get another swing frequency.

In a preferred embodiment of the present invention, the swing unit includes a spindle and/or a feed shaft, and the processing conditions include the rotation speed of the spindle, the feed speed of the feed axis, and at least one feature of the workpiece, and the swing unit and the first swing The shaft and the second swing shaft connection and machine performance include speed loop gain, speed loop integral time constant and/or position loop gain, and workpiece features include the shape, size and/or at least material characteristics of the workpiece.

In the preferred embodiment of the present invention, the swing amplitude is calculated based on the speed, feed speed, speed loop gain, and speed loop integral time constant, and the swing frequency is based on the 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 thread processing chip breaking control method further includes calculating the first swing amplitude according to the speed, the feed speed, the speed loop gain, the speed loop integral time constant, and the position loop gain, and further according to the speed, The feed rate, workpiece characteristics, speed loop gain, speed loop integral time constant and position loop gain are calculated to obtain the first swing frequency.

In the preferred embodiment of the present invention, the workpiece will produce a first chip breaking amount at the first time in the chip breaking process of thread machining, and a second chip breaking amount will be produced at the second time. Both chip breaking amounts are included in the tolerance interval.

In a preferred embodiment of the present invention, the workpiece is in the thread machining chip breaking process at the third time according to the third oscillation amplitude and the third oscillation frequency to perform the thread machining chip breaking process, and the workpiece is at the first time in the thread machining chip breaking process The four-time thread processing chip breaking process is performed according to the fourth swing amplitude and the fourth swing frequency, and the third swing amplitude is greater than the fourth swing amplitude, and the third swing frequency is less than the fourth swing frequency. The swing unit moves at the third time The third processing distance of is smaller than the fourth processing distance moved at the fourth time.

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

In a preferred embodiment of the present invention, the thread processing chip breaking control method further includes: receiving the feedback value of the first swing axis and the second swing axis for the thread processing and chip breaking process of 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 according to the swing feedback movement command to control the driver to simultaneously drive the first swing The axis and the second swing axis perform threading and 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 swing unit moves along the first tooth surface of the workpiece during the threading and chip breaking process.

In a preferred embodiment of the present invention, the swing unit moves along the first tooth surface and the second tooth surface of the workpiece in a staggered movement during the threading and chip breaking process.

Steps S10-S20: Step flow chart of the chip breaking control method for thread machining

1: Thread processing 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 axis

Fig. 1A is a schematic diagram showing a single-axis vibration chip breaking processing process according to the prior art.

Fig. 1B is a schematic diagram showing the 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 thread processing according to the technology disclosed in the present invention.

FIG. 3 is a block diagram of the chip breaking control system for thread machining according to the technology disclosed in the present invention.

Please refer to Figure 2 and Figure 3 first. 2 is also explained in conjunction with FIG. 3 while describing FIG. 2 in which FIG. 2 is a flow chart showing the steps of the thread processing chip-breaking control method according to the technology disclosed in the present invention, and FIG. 3 shows the thread processing chip-breaking control system Schematic. In FIG. 2, the steps of the method for controlling chip-breaking in thread machining include: Step S10: Turn on the chip-breaking process in the machining interval. In this step, the user turns on the chip breaking processing function on the host computer 2 according to the actual processing requirements, and the chip interrupting function is the thread processing chip breaking process. Step S12: receiving a processing command, at least one processing 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. The definition of the processing command, processing conditions and machine performance will be in Detailed instructions will be given later. It is worth noting that the machine performance can be obtained by the host computer 2 or can be built in the memory unit 36 of the control module 3.

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

Finally, in step S20: drive the first swing axis and the second swing axis according to the swing movement command to perform a threading and chip breaking process on the workpiece. In this step, the control module 3 can drive the driver 4 to control the first swing axis 52 and the second swing axis to simultaneously align the workpiece (not shown in the figure) according to the swing movement command calculated by the path planning unit 34 in step S18. Indicated in the middle) for threading and 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 Figure 3. Fig. 3 is a schematic diagram showing a chip breaking control system for thread machining. The thread processing 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 connected to the host computer 2 and the driver 4, respectively. 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 upper computer 2 may be a processing machine (not shown in the figure) controller, a desktop computer, a notebook computer, a smart phone or a remote server, etc., and the upper 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. The command receiving unit 30 receives processing commands, processing conditions, and machine performance from the host computer 2. The command receiving unit 30 calculates the movement command according to the machining command and the machining condition, where the machining condition includes the rotation speed of the main shaft and the feed speed of the feed axis, and transmits the calculated movement command to the path planning unit 34. In addition, the command receiving unit 30 transmits the rotation speed of the spindle, the feed speed of the feed shaft, at least one feature of the workpiece and the machine performance in the processing conditions to the chip breaking unit 32. In the present invention, the processing command refers to the processing state of the workpiece, that is, what form the user wants to process the workpiece. The workpiece characteristics of the workpiece include the shape, size and/or material characteristics of the workpiece; the machine performance includes the speed loop gain, the speed loop integral time constant and/or the position loop gain.

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

In another embodiment of the present invention, the chip breaking unit 32 can calculate the first swing according to the rotation speed of the main shaft, the feed speed of the feed shaft, the speed loop gain, the speed loop gain, the speed loop integral time constant, and the position loop gain. Amplitude; In addition, the chip breaking unit 32 calculates to obtain the first oscillation frequency according to the spindle speed, feed speed of the feed axis, workpiece characteristics, speed loop gain, speed loop integral time constant and 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 oscillation amplitude and the first oscillation frequency, which is actually an optimization method, which can improve the thread The stability and accuracy of the chip breaking process.

Then, the chip breaking unit 32 transmits the oscillation amplitude and oscillation frequency obtained by the above calculation to the path planning unit 34, and the path planning unit 34 is based on the movement command transmitted by the command transmission unit 30 and the oscillation amplitude and the oscillation amplitude transmitted by the chip breaking unit. The swing frequency is used to calculate the swing movement command. In another embodiment, the chip breaking unit 32 transmits the first oscillation amplitude and the first oscillation frequency to the path planning unit 34. Similarly, the path planning unit 34 is based on the movement command transmitted by the command transmission unit 30 and the chip breaking The first swing amplitude and the first swing frequency transmitted by the unit are calculated to obtain the first swing movement command, so that the driver 4 receives the swing movement command (or the first swing movement command) transmitted by the path planning unit 34 in the control module 3. ), and according to this swing movement command (or the first A swing movement command) simultaneously controls the first swing unit 52 and the second swing unit 54 to perform threading and chip breaking processes on the workpiece (not shown in the figure).

In the embodiment of the present invention, the chip breaking unit 32 mainly sets the swing frequency reference interval according to the machine performance. In another embodiment, the user may also set the swing frequency reference interval. 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 one included in the swing frequency reference interval.的wigging frequency. For example, when the swing frequency calculated by the chip breaking unit 32 ( _{called swing frequency f 1} ) is less than the minimum value of the swing frequency reference interval ( _{called swing frequency f A} ) or greater than the maximum value of the swing frequency reference interval ( When the oscillating frequency f _{B is} called), that is, the oscillating frequency f _{1 does} not fall into the oscillating frequency reference interval, the chip breaking unit 32 will not directly _{output the calculated oscillating frequency f 1} to the path planning unit 34, but according to the oscillating frequency f 1 The frequency f _A and the swing frequency f _{B calculate another swing frequency (referred to as the swing frequency f 2} ) included in the swing frequency reference interval, and the subsequent chip breaking unit 32 _{outputs the swing 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 machine performance. 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 swing amplitude included in the swing amplitude reference interval. For example, when the swing amplitude calculated by the chip breaking unit 32 ( _{called swing amplitude h 1} ) is less than the minimum value of the swing amplitude reference interval ( _{called 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 does 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 included in the swing amplitude reference interval ( _{referred to as the swing amplitude h 2} ), 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 swing movement command based on the movement command from the command receiving unit 30 and the swing frequency and swing amplitude 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 and 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 axis and the second swing axis are connected to the main shaft and/or the feed axis, so when the swing unit is the feed axis (corresponding to the tool or the workpiece according to the actual processing flow), the feed axis can be Swing on any two of the x, y, or z axes. Among them, the feed axis can swing on any two of the x, y, or z axes in accordance with the actual processing flow to perform chip breaking during processing. For example, when the machining process is linear chip breaking, the feed axis can swing on any two of the x, y, or z axes for chip breaking. In another embodiment, similarly, when the machining process is an oblique line or an arc, the feed axis can swing on any two 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 can be any two of the x, y, or z axes.

In another embodiment, when the swing unit is the spindle (corresponding to the tool or workpiece according to the actual machining process), the spindle can swing at axis a, b or c, and the spindle can be at axis 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 linear chip breaking, the spindle can swing in any two of the a, b, or c axes for chip breaking; in another embodiment, when the machining process is diagonal or arc , The spindle can also swing on any two of the a, b or c axis for chip breaking processing. In other words, the first swing axis 52 and the second swing axis 54 can be any two of the a, b, or c axis. In another embodiment, when the swing unit is the feed axis and the spindle (corresponding to the tool or the workpiece according to the actual processing flow), the feed axis can swing in any of the x, y, or z axes and the spindle can be at a , B or c axis swings for chip breaking processing. In other words, the first swing axis 52 can be any of the x, y, or z axes, and the second swing axis 54 can be any of the a, b, or c axes.

For example, the first swing shaft 52 and the second swing shaft 54 are respectively connected to the swing unit, and the swing unit moves along the first tooth surface of the workpiece to perform the threading and chip breaking process. Specifically, the driver 4 moves according to the swing Commands to simultaneously control the first swing axis 52 and the second swing axis 54 to move the swing unit along the first tooth surface of the workpiece (not shown in the figure), that is, the workpiece is threaded and chip-broken by a single-side feed method. . In another embodiment, the swing unit moves staggered along the first tooth surface and the second tooth surface of the workpiece to perform the threading and chip-breaking process, that is, to perform the threading and chip-breaking process on the workpiece in a left and right feed. 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 staggeredly move along the first tooth surface and the second tooth surface of the workpiece. , That is, the workpiece is firstly threaded and chip-breaking process in the way of single-side infeed, and then threaded and chip-breaking process is carried out in the way of left and right infeed.

In the embodiment of the present invention, the control module 3 further includes a memory unit 36 for storing processing conditions, machine performance, swing frequency reference interval, swing amplitude reference interval, and tolerance interval. In addition, the memory unit 36 also stores a resonance frequency range. When the swing frequency ( _{called swing frequency f 3} ) calculated by the chip breaking unit 32 is included in the preset resonance frequency range (that is, the swing frequency f ₃ falls into the resonance frequency range). Frequency range), it means that the vibration frequency generated by the first swing shaft 52 and the second swing shaft 54 during the thread processing chip breaking process will resonate with the machine (not shown in the figure), which will cause the thread processing to break The chip manufacturing process cannot proceed smoothly, and it is easy to damage 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 avoids all frequencies in the resonance frequency range to recalculate the swing frequency f ₄ , and the subsequent chip breaking unit 32 will The wobble frequency f _{4 is} output to the path planning unit 34.

In an embodiment of the present invention, the amount of chip breaking is generated during the process of threading and chip breaking of the workpiece. When the driver 4 simultaneously drives the first swing shaft 52 and the second swing shaft 54 to perform the threading and chip breaking process on the workpiece according to the swing movement command, if the amount of chip breaking generated is included in the tolerance interval, it means that the chip breaking unit 32 calculates The output swing frequency and swing amplitude can be stabilized Chip breaking. If the amount of chip breaking is not included in the tolerance range, the user can determine whether the chip breaking unit 32 needs to recalculate the oscillation frequency and oscillation amplitude according to the actual processing conditions, so that the chip breaking process generated by the chip breaking process in a different unit time is broken. The amount of chips should be included in the tolerance interval. In the embodiment of the present invention, the amount of chip breaking may be weight or volume. For example, the workpiece will produce the first chip breaking amount at the first time in the chip breaking processing process, and the second chip breaking amount will be produced at the second time. When the weight of the first chip breaking amount and the second chip breaking amount is equal to or The volume is included in the tolerance interval, 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 swing frequency and swing amplitude are also adjusted accordingly. Taking the workpiece as a bar mounted on the spindle and the swing unit as a tool mounted on the feed axis as an example, in the chip breaking process, the tool will be processed 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 bar diameter is 50mm), it will perform chip breaking processing on the bar according to the third oscillation amplitude and the third oscillation frequency; when the tool is at the fourth time (for example, the bar diameter is 40mm), it will be processed according to The fourth oscillating amplitude and the fourth oscillating frequency perform a chip breaking processing process on the bar. The third swing amplitude is greater than the fourth swing amplitude, the third swing frequency is less 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 during the threading and chip 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), where the feedback value is encoded by the motor Generator (not shown in the figure). Then, the path planning unit 34 compares this feedback value with the previously calculated swing movement command calculated by the chip breaking unit 32 based on the swing amplitude and swing frequency to obtain the feedback movement command; next, the path planning unit 34 uses this Feedback movement command, in the next unit time, the movement command (second movement command) and swing amplitude (second pendulum The vibration amplitude) and the vibration frequency (the second vibration frequency) are used to calculate the vibration feedback movement command. It should be noted that the movement command obtained in the next unit time occurs later than the previously mentioned user through the upper position The machine 2 receives the processing command from the command receiving unit 30 of the control module 3 at the time of occurrence, processing conditions, and machine performance, and the command receiving unit 30 calculates the time of the movement command according to the processing 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 thread processing interruption.

1: Thread processing 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 axis

Claims (28)

A thread processing chip breaking control system includes: a control module, including: a command receiving unit for receiving at least one processing command, at least one processing condition, at least one feature of a workpiece, and at least one machine performance, and The command receiving unit calculates a movement command according to the processing command and the processing condition, wherein the feature of the workpiece includes a shape, a size, and/or at least one material characteristic of the workpiece; a chip breaking unit receives the command received by the command receiving unit The processing conditions and the machine performance are transmitted, and the chip breaking unit calculates a swing amplitude and a swing frequency according to the processing conditions and the machine performance; and a path planning unit receives the calculation by the command receiving unit A movement command, and receiving the oscillation amplitude and the oscillation frequency calculated by the chip breaking unit, and the path planning unit calculates a oscillation movement command according to the movement command, the oscillation amplitude and the oscillation frequency; a driver, and the control The module is connected to receive the oscillating movement command transmitted by the path planning unit; and a first oscillating shaft and a second oscillating shaft are respectively connected to the driver, and the control module controls the driver to simultaneously drive the driver according to the oscillating movement command. The first swing shaft and the second swing shaft are used to perform a threading and chip breaking process on the workpiece. The chip breaking control system for thread machining according to claim 1, wherein the chip breaking unit sets a 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 oscillating frequency is not included in the oscillating frequency reference interval, and the chip breaking unit recalculates according to the processing conditions and the performance of the machine to obtain another oscillating frequency. The thread processing chip breaking control system according to claim 1, wherein the chip breaking unit sets a swing amplitude reference interval according to the machine performance, 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, and the chip breaking unit recalculates according to the processing conditions and the performance of the machine to obtain another swing amplitude. The thread processing chip breaking control system according to claim 1, wherein the control module further includes a memory unit for receiving and storing the processing conditions and the machine performance input by a user. The thread processing chip breaking control system according to claim 4, further comprising storing at least one resonance frequency interval in the memory unit, and when the oscillation frequency is included in the resonance frequency interval, the chip breaking unit is based on the processing conditions and The performance of the machine is recalculated to get another swing frequency. The thread processing chip-breaking control system 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 processing The conditions include a rotation speed of the main shaft and a feed speed of the feed axis, 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 thread processing chip-breaking control system according to claim 6, wherein the first swing axis and the second swing axis are connected with the main shaft and/or the feed axis, and the driver simultaneously drives the first swing axis according to the swing movement command. The swing axis and the second swing axis. The thread processing chip breaking control system according to claim 1, wherein the chip breaking unit calculates the swing amplitude according to the rotation speed, the feed speed, the speed loop gain, and the speed loop integral time constant, and the chip breaking unit calculates the oscillation amplitude according to The rotation speed, the feed speed, the feature of the workpiece, the speed loop gain and the speed loop integral time constant are calculated to obtain the swing frequency. The thread processing chip breaking control system according to claim 1, wherein the chip breaking unit is further based on the speed, the feed speed, the speed loop gain, the speed loop integral time constant and the position The loop gain calculates a first swing amplitude, and the chip breaking unit further calculates a first swing based on the rotation speed, the feed speed, the workpiece characteristics, the speed loop gain, the speed loop integral time constant, and the position loop gain. frequency. The thread machining chip breaking control system according to claim 1, wherein the workpiece generates a first chip breaking amount at a first time in the thread machining chip breaking process, and a second chip break occurs 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 thread machining chip breaking control system according to claim 1, wherein the workpiece is in the thread machining chip breaking process at a third time according to a third swing amplitude and a third swing frequency to perform the chip breaking process, and During a fourth time in the thread machining chip breaking process of the workpiece, the thread machining chip breaking process is performed according to a fourth oscillation amplitude and a fourth oscillation frequency, and the third oscillation amplitude is greater than the fourth oscillation amplitude, and the first oscillation amplitude is greater than the fourth oscillation amplitude. The three 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 thread processing chip breaking control system according to claim 6, wherein the swing unit moves along a first tooth surface of the workpiece during the thread processing chip breaking process. The thread processing chip breaking control system according to claim 6, wherein the swing unit moves along the first tooth surface and a second tooth surface of the workpiece in a staggered movement during the thread processing chip breaking process. The thread machining chip-breaking control system according to claim 1, wherein the path planning unit further includes: receiving a feedback value of the first swing axis and the second swing axis to perform the threading chip-breaking process on the workpiece; Comparing the feedback value with the swing movement command to generate a feedback movement command; Calculate a swing feedback movement command according to the feedback movement command, a second movement command, a second swing amplitude, and a second swing frequency; and simultaneously drive the first swing shaft and the first swing axis according to the swing feedback movement command The two swing shafts are used to perform the thread processing 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. A thread machining chip-breaking control method, which includes the steps of: starting a thread machining chip-breaking process in a machining interval; receiving a machining command, at least one machining condition, at least one feature of a workpiece, and at least one machine performance, wherein the The feature of the workpiece includes a shape, a size, and/or at least one material characteristic of the workpiece; a movement command is calculated according to the processing command and the processing condition; a swing amplitude and a swing frequency are calculated according to the processing condition and the performance of the machine; A swing movement command is calculated according to the movement command, the swing amplitude, and the swing frequency; and a driver is controlled according to the swing movement command to simultaneously drive a first swing axis and a second swing axis to perform the thread processing on the workpiece. Chip manufacturing process. The chip breaking control method for thread machining according to claim 15, further comprising setting a swing frequency reference interval according to the performance of the machine, and comparing the swing frequency with the swing frequency reference interval, when the swing frequency is not included in the swing frequency reference interval. In the swing frequency reference interval, recalculate according to the processing conditions and the performance of the machine to obtain another swing frequency. The chip breaking control method for thread machining according to claim 15, further comprising setting a swing amplitude reference interval according to the performance of the machine, and comparing the swing amplitude with the swing amplitude reference interval, when the swing amplitude is not included in the swing amplitude reference interval. In the swing amplitude reference interval, recalculate according to the processing conditions and the performance of the machine to obtain another swing amplitude. The chip breaking control method for thread machining according to claim 15, wherein the machining conditions and the machine performance are input by a user or stored in a memory unit. The thread processing chip breaking control method according to claim 18, further comprising storing at least one resonance frequency interval in the memory unit, and when the oscillation frequency is included in the resonance frequency interval, according to the processing conditions and the performance of the machine Recalculate to get another swing frequency. The chip breaking control method for thread machining according to claim 15, wherein the swing unit includes a spindle and/or a feed axis, and the processing conditions include a rotation speed of the spindle and a feed speed of the feed axis, 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 thread processing chip-breaking control method according to claim 20, wherein the swing amplitude is calculated based on the rotation speed, the feed speed, the speed loop gain, and the speed loop integral time constant, and the swing frequency is based on the rotation speed , The feed speed, the feature of the workpiece, the speed loop gain and the speed loop integral time constant are calculated. The chip breaking control method for thread machining according to claim 20, further comprising calculating a first swing amplitude according to the rotation speed, the feed speed, the speed loop gain, the speed loop integral time constant, and the position loop gain, and According to the rotation speed, the feed speed, the characteristics of the workpiece, the speed loop gain, the speed loop integral time constant, and the position loop gain, a first swing frequency is calculated. The thread machining chip breaking control method of claim 15, wherein the workpiece will produce a first chip breaking amount at a first time in the thread machining chip breaking process, and a second chip break will occur 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 thread machining chip breaking control method according to claim 15, wherein the thread machining chip breaking process is performed according to a third oscillation amplitude and a third oscillation frequency during a third time in the thread machining chip breaking process of the workpiece, And the workpiece is subjected to the thread machining chip breaking process according to a fourth oscillation amplitude and a fourth oscillation frequency during a fourth time in the thread machining chip breaking process, and the third oscillation amplitude is greater than the fourth oscillation amplitude, the 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 thread processing chip breaking control method according to claim 20, wherein the first swing shaft and the second swing shaft are connected with the main shaft and/or the feed shaft, and the driver simultaneously drives the first swing axis according to the swing movement command. The swing axis and the second swing axis. The thread machining chip-breaking control method according to claim 15, further comprising: receiving a feedback value of the first swing shaft and the second swinging shaft for the thread processing chip-breaking process on the workpiece respectively; comparing the feedback Value and the swing movement command to generate a feedback movement command; calculate a swing feedback movement command according to the feedback movement command, a second movement command, a second swing amplitude, and a second swing frequency; and according to the swing Feedback movement command to control the driver to simultaneously drive the first swing axis and the second swing axis to perform the threading and chip-breaking process compensation on the workpiece, wherein the occurrence time of the movement command is earlier than the occurrence of the second movement command Point in time. The thread processing chip breaking control method according to claim 20, wherein the swing unit moves along a first tooth surface of the workpiece during the thread processing chip breaking process. The thread machining chip-breaking control method according to claim 27, wherein the swing unit moves along the first tooth surface and a second tooth surface of the workpiece in a staggered movement during the thread machining and chip-breaking process.

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