WO2023218649A1 - 工作機械の制御装置 - Google Patents
工作機械の制御装置 Download PDFInfo
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- WO2023218649A1 WO2023218649A1 PCT/JP2022/020243 JP2022020243W WO2023218649A1 WO 2023218649 A1 WO2023218649 A1 WO 2023218649A1 JP 2022020243 W JP2022020243 W JP 2022020243W WO 2023218649 A1 WO2023218649 A1 WO 2023218649A1
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- chip length
- correction value
- control device
- machine tool
- calculation unit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q15/00—Automatic control or regulation of feed movement, cutting velocity or position of tool or work
- B23Q15/007—Automatic control or regulation of feed movement, cutting velocity or position of tool or work while the tool acts upon the workpiece
- B23Q15/013—Control or regulation of feed movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B25/00—Accessories or auxiliary equipment for turning-machines
- B23B25/02—Arrangements for chip-breaking in turning-machines
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/404—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control arrangements for compensation, e.g. for backlash, overshoot, tool offset, tool wear, temperature, machine construction errors, load, inertia
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/4093—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by part programming, e.g. entry of geometrical information as taken from a technical drawing, combining this with machining and material information to obtain control information, named part programme, for the NC machine
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/37—Measurements
- G05B2219/37434—Measuring vibration of machine or workpiece or tool
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/41—Servomotor, servo controller till figures
- G05B2219/41256—Chattering control
Definitions
- the present disclosure relates to a control device for a machine tool.
- the cutting tool and workpiece are oscillated relative to each other.
- Oscillating cutting for cutting a workpiece is known.
- the tool path which is the locus of the cutting tool, is set so as to partially overlap the previous tool path.
- the cutting edge of the cutting tool separates from the surface of the workpiece, causing a missed swing called an air cut, which shreds the chips.
- the chips even if the chips can be shredded, if the length of the chips is too long, the chips may become entangled with the workpiece or cutting tool. Furthermore, if the cutting tool or workpiece is excessively swung in order to shorten the length of the chips, the mechanical load will increase and there is a risk that the machine will break down.
- the desired chip length is simply determined from the number of vibrations, but the chip length depends on the machining conditions and swing conditions, and the chip length is taken into consideration during machining. It was difficult to set the conditions and swing conditions. Therefore, a technology that can calculate the chip length and easily set the machining conditions and swing conditions while checking the calculated chip length is desired.
- the present disclosure has been made in view of the above problems, and aims to provide a technology that can calculate chip length and easily set machining conditions and swing conditions while checking the calculated chip length. purpose.
- the present disclosure is a control device for a machine tool that processes a cutting tool and a workpiece while relatively rocking the same, and includes a condition acquisition unit that acquires machining conditions and rocking conditions, and a condition acquisition unit that acquires machining conditions and rocking conditions; a chip length calculation section that calculates a chip length based on the machining conditions and the swinging conditions; and a chip length output section that outputs the chip length calculated by the chip length calculation section.
- This is a control device for a machine tool, comprising:
- FIG. 3 is a diagram for explaining swing cutting.
- 1 is a functional block diagram of a control device for a machine tool according to a first embodiment.
- FIG. It is a figure which shows the chip length confirmation screen in which machining conditions and rocking
- FIG. 2 is a functional block diagram of a control device for a machine tool according to a second embodiment.
- FIG. 3 is a diagram showing a first example of a chip length correction table.
- FIG. 3 is a diagram showing a first example of a chip length correction table. It is a figure which shows the chip length confirmation screen on which the calculated chip length is displayed.
- FIG. 3 is a functional block diagram of a control device for a machine tool according to a third embodiment. It is a figure which shows the attenuation rate of the actual value with respect to the command value of a rocking amplitude.
- FIG. 1 is a diagram for explaining swing cutting.
- oscillating cutting shown in FIG. (not shown) are operated to relatively rotate the cutting tool T and workpiece W, and perform cutting while relatively swinging the cutting tool T and workpiece W in the feeding direction.
- the tool path which is the locus of the cutting tool T, is set so that the current path partially overlaps the previous path. In other words, the part that was machined in the previous path is partially included in the current path, causing a miss called air cut in which the cutting edge of the cutting tool T separates from the surface of the workpiece W, and the chips are shredded.
- the shape of the workpiece is not limited. In other words, even if the workpiece has a tapered part or an arcuate part on the machined surface and requires multiple feed axes (Z-axis and X-axis), if the workpiece is columnar or cylindrical and the feed axis is (Z-axis) is also applicable.
- FIG. 2 is a functional block diagram of the machine tool control device 1 according to the first embodiment.
- the machine tool control device 1 includes an input section 11, a condition acquisition section 12, a chip length calculation section 13, and a chip length output section 14. , and a chip length display section 15.
- the machine tool control device 1 includes, for example, memory such as ROM (read only memory) and RAM (random access memory), a CPU (control processing unit), and a communication control unit that are connected to each other via a bus. Constructed using a computer. The functions and operations of each of the functional units described above are achieved by the cooperation of a CPU installed in the computer, a memory, and a control program stored in the memory.
- the machine tool control device 1 may be configured with a CNC (Computer Numerical Controller), and may be connected to a host computer (not shown) such as a CNC or a PLC (Programmable Logic Controller). In addition to the machining program, machining conditions such as rotation speed and feed rate, and swing conditions such as swing amplitude and swing frequency are input from the host computer to the control device 1 of the machine tool.
- a CNC Computer Numerical Controller
- PLC Programmable Logic Controller
- the input unit 11 inputs information regarding processing conditions and swing conditions in response to an operator's input operation on an input means (not shown) such as a keyboard or touch panel. Information regarding machining conditions and swing conditions input through the input section 11 is output to a condition acquisition section 12, which will be described later.
- the condition acquisition unit 12 acquires the machining conditions and swing conditions input through the input unit 11.
- the condition acquisition unit 12 outputs these acquired machining conditions and swing conditions to a chip length calculation unit 13, which will be described later.
- the machining conditions include at least information regarding the machining diameter (mm), as well as, for example, the rotation speed S (1/min) of the spindle, the amount of transfer F (mm/rev) each time, and the feed rate of the cutting tool. (mm/min), work diameter (mm), cutting edge R (mm), clearance angle of the cutting tool (°), etc.
- the oscillation conditions include information regarding the relative number of oscillations per revolution between the cutting tool and the workpiece, and information regarding the oscillation amplitude with respect to the relative feed amount per revolution between the cutting tool and the workpiece.
- Information regarding the relative number of oscillations per rotation between the cutting tool and the workpiece includes an oscillation frequency multiplier I (times) indicating the oscillation frequency per one rotation of the main shaft.
- the swing amplitude magnification K indicates the magnitude of the swing amplitude relative to the feed amount per rotation of the spindle. (times) is mentioned.
- the oscillation frequency magnification I can be specified directly, or it can be calculated from the oscillation frequency (Hz) and the spindle rotation speed S (1/min) after specifying the oscillation frequency (Hz). good.
- the swing amplitude magnification K times may be specified directly in the same way, or it can be calculated from the swing amplitude (mm) and the amount of transfer each time F (mm/rev) after specifying the swing amplitude (mm). You may.
- the chip length calculation unit 13 calculates the chip length based on the machining conditions and swing conditions acquired by the condition acquisition unit 12. A specific method for calculating the chip length will be detailed later.
- the chip length output unit 14 outputs the chip length calculated by the chip length calculation unit 13 to the outside.
- the chip length output unit 14 outputs the calculated chip length to a chip length display unit 15, which will be described later.
- the chip length display section 15 displays the chip length output by the chip length output section 14. Specifically, the chip length display section 15 displays the chip length calculated by the chip length calculation section 13 on a chip length confirmation screen as described in detail later.
- FIG. 3 is a diagram showing a chip length confirmation screen in which machining conditions and swing conditions are input.
- FIG. 4 is a diagram showing cutting paths.
- FIG. 5 is a diagram showing a chip length confirmation screen on which the calculated chip length is displayed.
- the operator inputs machining conditions and swing conditions by operating the input means of the input section 11 using the chip length confirmation screen displayed on the chip length display section 15. .
- the operator inputs a coordinate value in the workpiece radial direction (also referred to as coordinate value Input I and the swing amplitude magnification K.
- the chip length calculation unit 13 automatically calculates the chip length based on the acquired machining conditions and rocking conditions. calculate. Specifically, the chip length calculation unit 13 calculates the coordinate value Y (mm) in the feed direction of the cutting pass using the following formula (1), and calculates the coordinate value Y (mm) in the feed direction of the cutting pass (previous cutting pass and current cutting pass). Search for the location where the phase difference between the intersection points is maximum.
- Y is the coordinate value in the feed direction (mm)
- f is the feed amount per spindle rotation (mm/rev)
- S is the spindle rotation speed (1/min)
- I is the oscillation frequency multiplier
- K represents the oscillation amplitude magnification (times)
- t represents time (sec).
- the intersection of the previous cutting pass and the current cutting pass is the starting point or ending point of air cutting. That is, the location where the phase difference between the intersection points of the previous cutting pass and the current cutting pass is maximum means the cutting section of the maximum chip length where the chip length is the maximum. Therefore, in this embodiment, the phase difference in the maximum chip length cutting section is calculated using the above formula (1), and the workpiece radius (mm) is calculated as the phase difference in the maximum chip length cutting section as shown in the following formula (2).
- the maximum chip length obtained by multiplying by etc. is calculated as the chip length (mm).
- maximum chip length and chip length will be explained as having the same meaning.
- the chip length calculated by the chip length calculation unit 13 of this embodiment excludes the section where air cut occurs. Therefore, the section where air cut occurs is not included in the chip length.
- the chip length calculation unit 13 of this embodiment it is possible to calculate a chip length more accurately than in the past.
- chip length calculated by the chip length calculation unit 13 as described above is automatically displayed on the chip length confirmation screen, as shown in FIG. This allows the operator to set machining conditions and oscillation conditions while checking the chip length, which has been calculated more accurately than before, making it easier to set machining conditions and oscillation conditions. ing.
- the machine tool control device 1 includes a condition acquisition unit 12 that acquires machining conditions and swing conditions, and a chip length calculation unit that calculates chip length based on the machining conditions and swing conditions. 13, and a chip length output unit 14 that outputs the calculated chip length.
- the chip length depends on the machining conditions and oscillation conditions, and while it was previously difficult to set the machining conditions and oscillation conditions while taking the chip length into consideration, this embodiment The chip length can be calculated based on the machining conditions and the swing conditions, and the machining conditions and the swing conditions can be easily set while checking the calculated chip length that is output to the outside.
- the machine tool control device 1 further includes a chip length display section 15 that displays the chip length outputted by the chip length output section 14.
- a chip length display section 15 that displays the chip length outputted by the chip length output section 14.
- the machine tool control device 1 acquires information regarding the machining diameter as the machining condition, and acquires information regarding the relative number of oscillations per rotation between the cutting tool and the workpiece as the oscillation condition. , information regarding the swing amplitude with respect to the relative feed amount per revolution between the cutting tool and the workpiece is acquired, and the chip length is calculated based on these machining conditions and swing conditions.
- the chip length depends on the vibration amplitude, which greatly affects the occurrence of air cuts, conventionally the vibration amplitude was not taken into account, but according to this embodiment, the vibration amplitude is not taken into consideration.
- the chip length can be calculated by including the dynamic amplitude in the calculation conditions, and it is possible to calculate a more accurate chip length excluding the air cut generation section.
- FIG. 6 is a functional block diagram of a machine tool control device 1A according to the second embodiment.
- the machine tool control device 1A according to the second embodiment has a correction value calculation unit 16 and an actual chip length acquisition unit, compared to the machine tool control device 1 according to the first embodiment.
- the chip length calculation unit 13A of the first embodiment further includes a chip length calculation unit 17, and that the chip length calculation unit 13A also corrects the chip length, and the other configurations are the same as those of the first embodiment. It is common to the form.
- the actual chip length acquisition unit 17 acquires the actual chip length obtained by actually measuring the chip length of the chips obtained by actually performing the swing cutting process. .
- the acquired actual chip length is output to a correction value calculation unit 16, which will be described later.
- the correction value calculation unit 16 calculates a correction value used to correct the chip length. Specifically, the correction value calculation unit 16 calculates the value based on the theoretical chip length calculated by the chip length calculation unit 13A and the measured actual chip length acquired by the actual chip length acquisition unit 17. , calculate the correction value. For example, the correction value calculation unit 16 calculates the value based on the deviation magnification or difference between the actual chip length and the theoretical chip length obtained by actually performing oscillating cutting under the machining conditions and oscillating conditions used for calculation. Then, the correction coefficient or correction amount is calculated. The calculated correction value is output to a chip length calculation unit 13A, which will be described later.
- the correction value calculation unit 16 calculates a correction value for each processing condition. Specifically, the correction value calculation unit 16 calculates the value for each machining condition including at least one of the material of the cutting tool's cutting edge, the shape of the cutting tool's cutting edge, the material of the workpiece, cutting speed, cutting depth, and cutting angle. , it is preferable to calculate a correction value.
- the chip length calculation unit 13A calculates the chip length based on the machining conditions and swing conditions acquired by the condition acquisition unit 12 using the same calculation method as the chip length calculation unit 13 of the first embodiment. calculate. Further, unlike the chip length calculation unit 13 of the first embodiment, the chip length calculation unit 13A calculates the calculated theoretical chip length using the correction value calculated by the correction value calculation unit 16. to correct.
- FIGS. 7 to 10 are diagrams showing a first example of a chip length correction table.
- FIG. 9 is a diagram showing a chip length confirmation screen on which the calculated chip length is displayed.
- FIG. 10 is a diagram showing a chip length confirmation screen on which the chip length corrected based on the chip length correction coefficient is displayed.
- the operator inputs the coordinate value X in the workpiece radial direction, which is information regarding the machining diameter, as the machining conditions, and also inputs the oscillation frequency multiplier I and the oscillation amplitude, which are the oscillation conditions. Enter the magnification K. Then, as shown in FIG. 9, the theoretical chip length automatically calculated by the chip length calculation unit 13A is displayed on the chip length confirmation screen as the chip length. In addition, the operator operates the control device 1A of the machine tool before and after the above input operation to actually execute the swing cutting process under the machining conditions and swing conditions used for calculating the theoretical chip length. Measure the length of the chips.
- the operator operates the input means of the input unit 11 to open a chip length correction table as shown in FIG. Then, as shown in Fig. 7, the chip length correction table contains, in addition to the workpiece radial coordinate value , the calculated theoretical chip length is automatically displayed.
- the operator operates the input means of the input unit 11 to input the actual chip length obtained by actual measurement.
- the correction value calculation unit 16 automatically calculates a correction coefficient based on the deviation magnification between the theoretical chip length and the actual chip length, and the calculated correction coefficient is automatically stored in the chip length correction table. will be displayed. Further, as shown in FIG. 10, the display of the chip length on the chip length confirmation screen is changed to the value of the chip length corrected using the correction coefficient.
- the correction value calculation unit 16 automatically calculates the correction coefficient based on the arithmetic average of the deviation magnification of the theoretical chip length and the actual chip length calculated for each combination.
- other data analysis methods such as the geometric mean, harmonic mean, median, and mode may be used.
- FIGS. 11 to 14 are diagrams showing a second example of a chip length correction table.
- FIG. 13 is a diagram showing a chip length confirmation screen on which the calculated chip length is displayed.
- FIG. 14 is a diagram showing a chip length confirmation screen on which chip lengths corrected for each type of workpiece are displayed.
- the operator inputs the workpiece radial coordinate value X, which is information about the machining diameter, and the type of workpiece (material) as the machining conditions, and also inputs the oscillation frequency magnification I and the oscillation amplitude magnification K, which are the oscillation conditions. input.
- the theoretical chip length automatically calculated by the chip length calculation unit 13A corresponding to the selected workpiece type is confirmed as the chip length. displayed on the screen.
- the operator operates the control device 1A of the machine tool before and after the above input operation to actually execute the swing cutting process under the machining conditions and swing conditions used for calculating the theoretical chip length. Measure the length of the chips.
- the operator operates the input means of the input unit 11 to open a chip length correction table as shown in FIG.
- the chip length correction table includes the workpiece radial coordinate value X, workpiece type, swing frequency multiplier I, and swing amplitude multiplier input on the chip length confirmation screen.
- the calculated theoretical chip length is automatically displayed.
- the operator operates the input means of the input unit 11 to input the actual chip length obtained by actual measurement.
- the correction value calculation unit 16 automatically calculates a correction coefficient based on the deviation magnification between the theoretical chip length and the actual chip length, and the calculated correction coefficient is automatically stored in the chip length correction table. will be displayed. Further, as shown in FIG. 14, the display of the chip length on the chip length confirmation screen is changed to the value of the chip length corrected using the correction coefficient.
- the correction coefficient is calculated for each type of workpiece.
- the correction coefficient is calculated for each type of workpiece, but in addition to the type of workpiece, the material of the cutting tool's cutting edge, the shape of the cutting tool's cutting edge, cutting speed, depth of cut, etc.
- a correction value such as a correction coefficient may be calculated for each processing condition including at least one of the cutting angle and the cutting angle.
- the correction value calculation unit 16 automatically calculates the correction coefficient based on the average value of the deviation magnification between the theoretical chip length and the actual chip length calculated for each combination.
- the machine tool control device 1A further includes a correction value calculation unit 16 that calculates a correction value used for correcting the chip length, and the correction value calculation unit 16 calculates the calculated chip length.
- the configuration is such that correction is performed using the correction value calculated in .
- an actual chip length acquisition unit 17 is further provided to acquire the actual chip length obtained by actually performing machining, and the calculated theoretical chip length and actual chip length are Based on this, the correction value is calculated. This allows more accurate chip length calculation.
- the correction value calculation unit 16 is configured to calculate a correction value for each machining condition. More specifically, the correction value calculation unit 16 is configured for each machining condition including at least one of the material of the cutting tool edge, the shape of the cutting tool edge, the material of the workpiece, the cutting speed, the depth of cut, and the angle of cut. The configuration is such that the correction value is calculated based on the This makes it possible to calculate a more accurate chip length.
- FIG. 15 is a functional block diagram of a machine tool control device 1B according to the third embodiment.
- the machine tool control device 1B according to the third embodiment has a correction value calculation section 16A and an actual swing amplitude acquisition section, compared to the machine tool control device 1 according to the first embodiment. 18, and unlike the chip length calculation unit 13 of the first embodiment, the chip length calculation unit 13B also corrects the chip length, and the other configurations are the same as those of the first embodiment. It is common to
- the actual oscillation amplitude acquisition unit 18 acquires the oscillation amplitude of the actually measured cutting path obtained by actually performing oscillation cutting under the machining conditions and oscillation conditions used to calculate the theoretical chip length. Obtained as vibration amplitude.
- the actual value of the cutting path can be obtained by a position detector such as an encoder that is normally included in a servo motor.
- the acquired actual swing amplitude is output to a correction value calculation unit 16A, which will be described later.
- the correction value calculation unit 16A calculates a correction value used to correct the chip length. Specifically, the correction value calculation unit 16A calculates the attenuation rate of the actual rocking amplitude acquired by the actual rocking amplitude acquiring unit 18 with respect to the rocking amplitude acquired by the condition acquiring unit 12, that is, the command value of the rocking amplitude. Based on this, a correction value is calculated. For example, the attenuation rate itself is used as the correction value. The calculated correction value is output to a chip length calculation section 13B, which will be described later.
- the correction value calculation unit 16A calculates each machining condition, specifically, the material of the cutting tool edge, the shape of the cutting tool edge, the material of the workpiece, and the cutting speed. It is preferable to calculate the correction value for each processing condition including at least one of the following: , cutting thickness, and cutting angle.
- the chip length calculation unit 13B calculates the theoretical chip length based on the machining conditions and swing conditions acquired by the condition acquisition unit 12 using the same calculation method as the chip length calculation unit 13 of the first embodiment. Calculate. Further, the chip length calculation unit 13B uses the same calculation method as the chip length calculation unit 13 of the first embodiment to calculate the chip length using the above-mentioned formula (1). Instead of the dynamic amplitude magnification K, the chip length is calculated by substituting a value obtained by multiplying the oscillation amplitude magnification K by the attenuation factor as a correction value into Equation (1). Thereby, it is possible to calculate the chip length corrected based on the attenuation rate.
- FIG. 16 is a diagram showing the attenuation rate of the actually measured value of the oscillation amplitude with respect to the command value.
- FIG. 17 is a diagram showing a chip length confirmation screen in which the attenuation rate of the swing amplitude is input.
- FIG. 18 is a diagram showing a chip length confirmation screen on which the chip length corrected based on the attenuation rate of the swing amplitude is displayed.
- the operator inputs the coordinate value X in the workpiece radial direction, which is information regarding the machining diameter, as the machining conditions, and also inputs the oscillation frequency multiplier I and the oscillation amplitude, which are the oscillation conditions. Enter the magnification K. Then, as shown in FIG. 17, the theoretical chip length automatically calculated by the chip length calculation unit 13B is displayed as the chip length on the chip length confirmation screen.
- the operator operates the control device 1A of the machine tool before and after the above input operation to actually execute the oscillating cutting process under the machining conditions and oscillating conditions used for calculating the theoretical chip length, and to pass the cutting path. Obtain the actual measured value.
- the correction value calculation unit 16A calculates the attenuation rate of the actual measurement value with respect to the command value of the oscillation amplitude by comparing the command value and the actual measurement value of the cutting path, and calculates the attenuation rate of the actual measurement value with respect to the command value of the oscillation amplitude. itself as the correction value.
- the chip length calculation unit 13B calculates the corrected chip length based on the attenuation rate, and as shown in FIG. 18, the amplitude attenuation rate is displayed on the chip length confirmation screen. At the same time, the chip length display is changed to a chip length value corrected based on the attenuation rate.
- the machine tool control device 1B further includes an actual oscillation amplitude acquisition unit 18 that acquires an actual oscillation amplitude obtained by actually performing oscillation cutting, and a correction value calculation unit 16A.
- the correction value is calculated based on the attenuation rate of the actual swing amplitude acquired by the actual swing amplitude acquisition unit 18 with respect to the swing amplitude acquired by the condition acquisition unit 12. This allows more accurate chip length calculation.
- the correction value calculation units 16 and 16A automatically calculate the correction value, but the present invention is not limited to this.
- a configuration may be adopted in which an operator manually inputs and sets a correction value obtained by calculating or the like using an external computer.
- the correction value may be calculated based on the attenuation rate.
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Abstract
Description
第1実施形態に係る工作機械の制御装置は、切削工具とワークを相対的に揺動させながらワークを切削加工する揺動切削を実行する。図1は、揺動切削を説明するための図である。図1に示される揺動切削の一例では、切削工具TとワークWとを相対的に回転させる少なくとも一つの主軸Sと、切削工具TをワークWに対して相対移動させる少なくとも一つの送り軸(不図示)と、を動作させて、切削工具TとワークWとを相対的に回転させるとともに、切削工具TとワークWとを相対的に送り方向に揺動させながら切削加工する。このとき、切削工具Tの軌跡である工具経路は、前回経路に対して今回経路が部分的に重なるように設定される。即ち、前回経路で加工済の部分が今回経路に部分的に含まれることで、切削工具Tの刃先がワークWの表面から離れるエアカットと呼ばれる空振りが発生することにより、切屑が細断される。
図6は、第2実施形態に係る工作機械の制御装置1Aの機能ブロック図である。図6に示されるように、第2実施形態に係る工作機械の制御装置1Aは、第1実施形態に係る工作機械の制御装置1と比べて、補正値算出部16及び実切り屑長さ取得部17をさらに備える点と、第1実施形態の切り屑長さ算出部13と異なり切り屑長さ算出部13Aが切り屑長さの補正も行う点において相違し、その他の構成は第1実施形態と共通である。
図15は、第3実施形態に係る工作機械の制御装置1Bの機能ブロック図である。図15に示されるように、第3実施形態に係る工作機械の制御装置1Bは、第1実施形態に係る工作機械の制御装置1と比べて、補正値算出部16A及び実揺動振幅取得部18をさらに備える点と、第1実施形態の切り屑長さ算出部13と異なり切り屑長さ算出部13Bが切り屑長さの補正も行う点において相違し、その他の構成は第1実施形態と共通である。
11 入力部
12 条件取得部
13,13A,13B 切り屑長さ算出部
14 切り屑長さ出力部
15 切り屑長さ表示部
16,16A 補正値算出部
17 実切り屑長さ取得部
18 実揺動振幅取得部
Claims (9)
- 切削工具とワークを相対的に揺動させながら加工する工作機械の制御装置であって、
加工条件及び揺動条件を取得する条件取得部と、
前記条件取得部により取得された前記加工条件及び前記揺動条件に基づいて切り屑長さを算出する切り屑長さ算出部と、
前記切り屑長さ算出部により算出された前記切り屑長さを出力する切り屑長さ出力部と、を備える、工作機械の制御装置。 - 前記切り屑長さ出力部により出力された前記切り屑長さを表示する切り屑長さ表示部をさらに備える、請求項1に記載の工作機械の制御装置。
- 前記条件取得部は、
前記加工条件として、加工径に関する情報を取得するとともに、
前記揺動条件として、前記切削工具と前記ワークの相対的な1回転あたりの揺動数に関する情報と、前記切削工具と前記ワークの相対的な1回転あたりの送り量に対する揺動振幅に関する情報を取得する、請求項1又は2に記載の工作機械の制御装置。 - 前記切り屑長さの補正に用いられる補正値を算出する補正値算出部をさらに備え、
前記切り屑長さ算出部は、前記条件取得部により取得された前記加工条件及び前記揺動条件に基づいて算出した前記切り屑長さを、前記補正値算出部で算出された前記補正値を用いて補正する、請求項1から3いずれかに記載の工作機械の制御装置。 - 前記加工を実際に実行することにより得られる実切り屑長さを取得する実切り屑長さ取得部をさらに備え、
前記補正値算出部は、前記切り屑長さ算出部により算出された前記切り屑長さと、前記実切り屑長さ取得部により取得された前記実切り屑長さと、に基づいて、前記補正値を算出する、請求項4に記載の工作機械の制御装置。 - 前記補正値算出部は、揺動振幅に対する実揺動振幅の減衰率に基づいて、前記補正値を算出する、請求項4に記載の工作機械の制御装置。
- 前記加工を実際に実行することにより得られる実揺動振幅を取得する実揺動振幅取得部をさらに備え、
前記条件取得部は、揺動振幅を取得し、
前記揺動振幅に対する実揺動振幅の減衰率は、前記条件取得部により取得された前記揺動振幅と、前記実揺動振幅取得部により取得された前記実揺動振幅に基づいて算出する、請求項6に記載の工作機械の制御装置。 - 前記補正値算出部は、前記加工条件ごとに前記補正値を算出する、請求項4から7いずれかに記載の工作機械の制御装置。
- 前記補正値算出部は、前記切削工具の刃先の材料、前記切削工具の刃先の形状、前記ワークの材料、切削速度、切込み厚さ及び切込み角のうち少なくともいずれかを含む前記加工条件ごとに前記補正値を算出する、請求項8に記載の工作機械の制御装置。
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US20090107308A1 (en) * | 2007-10-16 | 2009-04-30 | Woody Bethany A | Methods and systems for chip breaking in turning applications using cnc toolpaths |
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JP6984790B1 (ja) * | 2020-10-21 | 2021-12-22 | 三菱電機株式会社 | 数値制御装置及び数値制御方法 |
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US20090107308A1 (en) * | 2007-10-16 | 2009-04-30 | Woody Bethany A | Methods and systems for chip breaking in turning applications using cnc toolpaths |
JP2018094690A (ja) * | 2016-12-15 | 2018-06-21 | シチズン時計株式会社 | 工作機械の制御装置および工作機械 |
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