WO2023218648A1 - 工作機械の制御装置 - Google Patents

工作機械の制御装置 Download PDF

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Publication number
WO2023218648A1
WO2023218648A1 PCT/JP2022/020242 JP2022020242W WO2023218648A1 WO 2023218648 A1 WO2023218648 A1 WO 2023218648A1 JP 2022020242 W JP2022020242 W JP 2022020242W WO 2023218648 A1 WO2023218648 A1 WO 2023218648A1
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WIPO (PCT)
Prior art keywords
surface roughness
correction value
conditions
cutting
control device
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/020242
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English (en)
French (fr)
Japanese (ja)
Inventor
祐太郎 堀川
将司 安田
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Fanuc Corp
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Fanuc Corp
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Filing date
Publication date
Application filed by Fanuc Corp filed Critical Fanuc Corp
Priority to PCT/JP2022/020242 priority Critical patent/WO2023218648A1/ja
Priority to JP2024520220A priority patent/JP7794960B2/ja
Priority to US18/860,890 priority patent/US20250296187A1/en
Priority to CN202280095798.5A priority patent/CN119343645A/zh
Priority to DE112022006789.6T priority patent/DE112022006789T5/de
Publication of WO2023218648A1 publication Critical patent/WO2023218648A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • B23Q15/12—Adaptive control, i.e. adjusting itself to have a performance which is optimum according to a preassigned criterion
    • 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—Program-control systems
    • G05B19/02—Program-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 program data in numerical form
    • G05B19/406—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 program data in numerical form characterised by monitoring or safety
    • G05B19/4068—Verifying part program on screen, by drawing or other means
    • 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—Program-control systems
    • G05B19/02—Program-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 program 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 program 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 program, for the NC machine
    • 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

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 present disclosure has been made in view of the above problems, and aims to provide a technology that can calculate surface roughness and easily set processing conditions and swing conditions while checking the calculated surface roughness. do.
  • 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; comprising a surface roughness calculation section that calculates surface roughness based on the processing conditions and the rocking condition, and a surface roughness output section that outputs the surface roughness calculated by the surface roughness calculation section. It is a control device for machine tools.
  • 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. FIG. 3 is a diagram showing a surface roughness confirmation screen on which machining conditions and swing conditions are input. It is a figure showing a cutting path. It is a figure which shows the surface roughness confirmation screen on which the calculated surface roughness is displayed.
  • FIG. 3 is a diagram showing phases of obtaining a roughness curve. It is a figure showing a roughness curve.
  • 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 surface roughness correction table.
  • FIG. 3 is a diagram showing a first example of a surface roughness correction table. It is a figure which shows the surface roughness confirmation screen on which the calculated surface roughness is displayed. It is a figure which shows the surface roughness confirmation screen on which the surface roughness correct
  • FIG. 7 is a diagram showing a second example of a surface roughness correction table.
  • FIG. 7 is a diagram showing a second example of a surface roughness correction table.
  • FIG. 7 is a diagram showing a surface roughness confirmation screen on which surface roughness corrected for each type of workpiece 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. It is a figure which shows the surface roughness confirmation screen in which the attenuation rate of a rocking
  • 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 surface roughness calculation section 13, a surface roughness output section 14, and a surface roughness output section 14.
  • a roughness display section 15 is provided.
  • 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 the acquired machining conditions and swing conditions to the surface roughness calculation unit 13, which will be described later.
  • the machining conditions include at least information regarding the relative feed amount per revolution between the cutting tool and the workpiece, information regarding the shape of the cutting tool's cutting edge, and, for example, the rotation speed S (1/ min), the feed rate of the cutting tool (mm/min), the workpiece diameter (mm), the clearance angle of the cutting tool (°), and the like.
  • Information regarding the relative feed amount per revolution between the cutting tool and the workpiece includes the amount of transfer each time F (mm/rev), and information regarding the shape of the cutting tool edge includes the R ( mm).
  • 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 may be specified directly in the same way, or after specifying the swing amplitude (mm), the swing amplitude (mm), feed rate (mm/min), and spindle rotation speed can be specified. It may be calculated from S(1/min).
  • the surface roughness calculation unit 13 calculates the surface roughness based on the processing conditions and swing conditions acquired by the condition acquisition unit 12.
  • the surface roughness calculated by the surface roughness calculation unit 13 is, for example, the arithmetic mean roughness, the maximum height that is the maximum distance between peaks and valleys, and the maximum height from the average line of the surface.
  • the maximum cross-sectional height which is the sum of the maximum height of the peaks and the maximum depth of the valleys of the contour curve element, and the load of the contour curve element at a predetermined cutting level (height% or ⁇ m)
  • the surface roughness output section 14 outputs the surface roughness calculated by the surface roughness calculation section 13 to the outside.
  • the surface roughness output unit 14 outputs the calculated surface roughness to a surface roughness display unit 15, which will be described later.
  • the surface roughness display section 15 displays the surface roughness output by the surface roughness output section 14. Specifically, the surface roughness display section 15 displays the surface roughness calculated by the surface roughness calculation section 13 on a surface roughness confirmation screen as described in detail later.
  • FIG. 3 is a diagram showing a surface roughness 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 surface roughness confirmation screen on which the calculated surface roughness is displayed.
  • the operator inputs processing conditions and swing conditions by operating the input means of the input section 11 using the surface roughness confirmation screen displayed on the surface roughness display section 15.
  • the operator sets the cutting tool's transfer amount F (mm/rev), which is information about the relative feed amount per rotation of the cutting tool and the workpiece, as the machining conditions.
  • the R (mm) of the cutting edge which is information regarding the shape of the cutting edge, is input, and the swinging frequency multiplier I and swinging amplitude multiplier K, which are swinging conditions, are input.
  • the input machining conditions and swing conditions are acquired by the condition acquisition unit 12, and the surface roughness calculation unit 13 automatically calculates the surface roughness based on the acquired machining conditions and rocking conditions. .
  • the surface roughness calculation unit 13 calculates the coordinate value Y (mm) of the feed direction of the cutting passes using the following formula (1), and searches for the location where the distance between the cutting passes 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).
  • FIG. 4 shows the location where the distance between cutting passes is maximum.
  • each coordinate value Y of the location where the distance between the cutting passes is the maximum is determined by the above formula (1), and the distance between the determined coordinate values is set as the maximum distance between the cutting passes.
  • the maximum height Rz which is the maximum distance between peaks and valleys, as surface roughness
  • the maximum height Rz can be calculated by substituting into the following formula (2).
  • the surface roughness after oscillating cutting is calculated from machining conditions such as the shape of the cutting tool's cutting edge, the rotational speed of the spindle, and the feed rate.
  • the oscillation frequency multiplier I and the oscillation amplitude multiplier K which are the oscillation conditions, are also used as calculation conditions. Calculate the surface roughness by including it in Therefore, according to the surface roughness calculation unit 13 of this embodiment, it is possible to calculate surface roughness more accurately than in the past.
  • the surface roughness calculated by the surface roughness calculation unit 13 as described above is automatically displayed on the surface roughness confirmation screen, as shown in FIG. In FIG. 5, the maximum height is displayed as the surface roughness. This allows the operator to set machining conditions and oscillation conditions while checking the surface roughness calculated more accurately than before, making it easier to set machining conditions and oscillation conditions. There is.
  • FIG. 6 is a diagram showing the phases of acquiring the roughness curve.
  • FIG. 7 is a diagram showing a roughness curve.
  • FIG. 6 shows the cutting path shown in FIG. 4 rotated by 90 degrees, and the phase at the point where the distance between the cutting paths is the maximum is the phase at which the roughness curve of the workpiece surface is obtained.
  • the roughness curve shown in FIG. 7 can be obtained by arranging a circular arc with a radius R of the cutting edge at the coordinate values of the cutting path in this phase. In this way, it is possible to obtain the roughness curve of the machined surface of the workpiece considering the cutting edge R of the cutting tool, and by substituting the Z value in the obtained roughness curve of FIG. 7 into the following formula (3), Arithmetic mean roughness Ra is calculated.
  • the machine tool control device 1 includes a condition acquisition unit 12 that acquires machining conditions and swing conditions, and a surface roughness calculation unit 13 that calculates surface roughness based on the machining conditions and swing conditions. , and a surface roughness output section 14 that outputs the calculated surface roughness.
  • a condition acquisition unit 12 that acquires machining conditions and swing conditions
  • a surface roughness calculation unit 13 that calculates surface roughness based on the machining conditions and swing conditions.
  • a surface roughness output section 14 that outputs the calculated surface roughness.
  • the machine tool control device 1 further includes a surface roughness display section 15 that displays the surface roughness outputted by the surface roughness output section 14.
  • a surface roughness display section 15 that displays the surface roughness outputted by the surface roughness output section 14.
  • the machine tool control device 1 acquires, as machining conditions, information regarding the relative feed amount per revolution between the cutting tool and the workpiece, and information regarding the shape of the cutting tool edge.
  • machining conditions information regarding the relative number of oscillations per rotation between the cutting tool and workpiece, and information regarding the oscillation amplitude with respect to the relative feed amount per rotation between the cutting tool and workpiece are acquired, and these machining conditions are and the surface roughness is calculated based on the swing conditions.
  • the surface roughness depends on the rocking conditions, conventionally the rocking conditions were not taken into consideration, but according to this embodiment, the rocking conditions are also included in the calculation conditions. It is possible to calculate the surface roughness more accurately.
  • FIG. 8 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 surface roughness acquisition unit, compared to the machine tool control device 1 according to the first embodiment. 17 and that, unlike the surface roughness calculation unit 13 of the first embodiment, the surface roughness calculation unit 13A also corrects the surface roughness, and the other configurations are the same as the first embodiment. be.
  • the actual surface roughness acquisition unit 17 acquires the actual surface roughness obtained by actually measuring the surface roughness of the workpiece machined surface obtained by actually performing the swing cutting process.
  • the acquired actual surface roughness 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 for correction of surface roughness. Specifically, the correction value calculation unit 16 calculates the correction value based on the theoretical surface roughness calculated by the surface roughness calculation unit 13A and the actual surface roughness measured by the actual surface roughness acquisition unit 17. calculate. For example, the correction value calculation unit 16 calculates the difference based on the deviation magnification or difference between the actual surface roughness and the theoretical surface roughness obtained by actually performing the oscillating cutting process under the machining conditions and oscillating conditions used for calculation. Calculate the correction coefficient or correction amount. The calculated correction value is output to a surface roughness calculation section 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 surface roughness calculation unit 13A calculates the surface roughness based on the processing conditions and swing conditions acquired by the condition acquisition unit 12 using the same calculation method as the surface roughness calculation unit 13 of the first embodiment. Furthermore, unlike the surface roughness calculation unit 13 of the first embodiment, the surface roughness calculation unit 13A corrects the calculated theoretical surface roughness using the correction value calculated by the correction value calculation unit 16.
  • FIGS. 9 to 12 are diagrams showing a first example of a surface roughness correction table.
  • FIG. 11 is a diagram showing a surface roughness confirmation screen on which the calculated surface roughness is displayed.
  • FIG. 10 is a diagram showing a surface roughness confirmation screen on which surface roughness corrected based on the surface roughness correction coefficient is displayed.
  • the operator selects, as machining conditions, the amount of transfer each time F (mm/rev), which is information about the relative feed amount per revolution between the cutting tool and the workpiece, and the cutting edge, which is information about the shape of the cutting tool's cutting edge.
  • R (mm) and the rotation speed S (1/min) of the main shaft are input, as well as the oscillation frequency magnification I and oscillation amplitude magnification K, which are the oscillation conditions.
  • the theoretical surface roughness automatically calculated by the surface roughness calculating section 13A is displayed on the surface roughness confirmation screen as the surface roughness.
  • the maximum height Rz is displayed as the surface roughness (the same applies to FIG. 12).
  • 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 processing conditions and swing conditions used for calculating the theoretical surface roughness. Measure the surface roughness of the machined surface of the workpiece.
  • the operator operates the input means of the input unit 11 to open a surface roughness correction table as shown in FIG.
  • the surface roughness correction table includes the amount of transfer each time F, the R of the cutting edge, the rotation speed S of the spindle, the oscillation frequency multiplier I, and the oscillation that were entered on the surface roughness confirmation screen.
  • the calculated theoretical surface roughness is automatically displayed.
  • the theoretical maximum height Rz is displayed as the calculated theoretical surface roughness (the same applies to FIG. 10).
  • the operator operates the input means of the input section 11 to input the actual surface roughness obtained by actual measurement.
  • the actual maximum height Rz is displayed as the actual surface roughness (the same applies to FIG. 10).
  • the correction value calculation unit 16 automatically calculates a correction coefficient based on the deviation magnification between the theoretical surface roughness and the actual surface roughness, and the calculated correction coefficient is automatically displayed on the surface roughness correction table. Ru. Further, as shown in FIG. 12, the surface roughness display on the surface roughness confirmation screen is changed to a surface roughness value corrected using the correction coefficient.
  • the correction value calculation unit 16 automatically calculates the correction coefficient based on the arithmetic mean of the deviation magnification of the theoretical surface roughness and the actual surface roughness calculated for each combination.
  • other data analysis methods such as the geometric mean, harmonic mean, median, and mode may be used.
  • FIGS. 13 to 16 are diagrams showing a second example of a surface roughness correction table.
  • FIG. 15 is a diagram showing a surface roughness confirmation screen on which the calculated surface roughness is displayed.
  • FIG. 16 is a diagram showing a surface roughness confirmation screen on which surface roughness corrected for each type of workpiece is displayed.
  • the operator selects, as machining conditions, the amount of transfer each time F (mm/rev), which is information about the relative feed amount per revolution between the cutting tool and the workpiece, and the cutting edge, which is information about the shape of the cutting tool's cutting edge.
  • R (mm) and the type of workpiece (material) are input, as well as the oscillation frequency magnification I and oscillation amplitude magnification K, which are the oscillation conditions.
  • the theoretical surface roughness automatically calculated by the surface roughness calculation unit 13A corresponding to the selected workpiece type is displayed as the surface roughness on the surface roughness confirmation screen. be done.
  • the maximum height Rz is displayed as the surface roughness (the same applies to FIG. 16).
  • 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 processing conditions and swing conditions used for calculating the theoretical surface roughness. Measure the surface roughness of the machined surface of the workpiece.
  • the operator operates the input means of the input unit 11 to open a surface roughness correction table as shown in FIG.
  • the surface roughness correction table includes the amount of transfer each time F, the radius of the cutting edge, the type of workpiece, the oscillation frequency multiplier I, and the oscillation amplitude multiplication factor that were input on the surface roughness confirmation screen.
  • the calculated theoretical surface roughness is automatically displayed.
  • the theoretical maximum height Rz is displayed as the calculated theoretical surface roughness (the same applies to FIG. 14).
  • the operator operates the input means of the input section 11 to input the actual surface roughness obtained by actual measurement.
  • the actual maximum height Rz is displayed as the actual surface roughness (the same applies to FIG. 14).
  • the correction value calculation unit 16 automatically calculates a correction coefficient based on the deviation magnification between the theoretical surface roughness and the actual surface roughness, and the calculated correction coefficient is automatically displayed on the surface roughness correction table. Ru. Further, as shown in FIG. 16, the surface roughness display on the surface roughness confirmation screen is changed to a surface roughness value 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 arithmetic average of the deviation magnification of the theoretical surface roughness and the actual surface roughness calculated in combination.
  • other data analysis methods such as the geometric mean, harmonic mean, median, and mode may be used.
  • the machine tool control device 1A further includes a correction value calculation unit 16 that calculates a correction value used for correction of surface roughness, and the correction value calculation unit 16 calculates the calculated surface roughness.
  • the configuration is such that the correction is performed using the corrected correction value. More specifically, an actual surface roughness acquisition unit 17 is further provided to acquire the actual surface roughness obtained by actually performing the machining, and correction is performed based on the calculated theoretical surface roughness and actual surface roughness. The configuration was configured to calculate the value. Thereby, more accurate surface roughness can be calculated.
  • 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 Thereby, more accurate surface roughness can be calculated.
  • FIG. 17 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 that, unlike the surface roughness calculation unit 13 of the first embodiment, the surface roughness calculation unit 13B also corrects the surface roughness, and the other configurations are the same as the first embodiment. be.
  • 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 surface roughness. Obtained as dynamic 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 for correction of surface roughness. 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 surface roughness calculation unit 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 surface roughness calculation section 13B calculates the theoretical surface roughness based on the processing conditions and swing conditions acquired by the condition acquisition section 12 using the same calculation method as the surface roughness calculation section 13 of the first embodiment. .
  • the surface roughness calculation section 13B uses the same calculation method as the surface roughness calculation section 13 of the first embodiment to calculate the surface roughness by using the above-mentioned formula (1).
  • K the surface roughness is calculated by substituting a value obtained by multiplying the swing amplitude magnification K by the attenuation rate as a correction value into Equation (1). Thereby, it is possible to calculate the corrected surface roughness based on the attenuation rate.
  • FIG. 18 is a diagram showing the attenuation rate of the actually measured value of the oscillation amplitude with respect to the command value.
  • FIG. 19 is a diagram showing a surface roughness confirmation screen in which the attenuation rate of the swing amplitude is input.
  • FIG. 20 is a diagram showing a surface roughness confirmation screen on which surface roughness corrected based on the attenuation rate of the swing amplitude is displayed.
  • the operator selects, as machining conditions, the amount of transfer each time F (mm/rev), which is information about the relative feed amount per revolution between the cutting tool and the workpiece, and the cutting edge, which is information about the shape of the cutting tool's cutting edge.
  • F mm/rev
  • the oscillation frequency magnification I and oscillation amplitude magnification K which are the oscillation conditions.
  • the theoretical surface roughness automatically calculated by the surface roughness calculating section 13B is displayed on the surface roughness confirmation screen as the surface roughness.
  • the maximum height Rz is displayed as the surface roughness (the same applies to FIG. 20).
  • 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 surface roughness, and to adjust the cutting path. Obtain actual measurements.
  • 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 surface roughness calculation unit 13B calculates the corrected surface roughness based on the attenuation rate, and as shown in FIG. 20, the amplitude attenuation rate is displayed on the surface roughness confirmation screen, and the surface roughness is The roughness display is changed to a surface roughness 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. Thereby, more accurate surface roughness can be calculated.
  • 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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  • Physics & Mathematics (AREA)
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  • Human Computer Interaction (AREA)
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PCT/JP2022/020242 2022-05-13 2022-05-13 工作機械の制御装置 Ceased WO2023218648A1 (ja)

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