WO2012133222A1 - 工作機械及びその加工制御装置 - Google Patents

工作機械及びその加工制御装置 Download PDF

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Publication number
WO2012133222A1
WO2012133222A1 PCT/JP2012/057586 JP2012057586W WO2012133222A1 WO 2012133222 A1 WO2012133222 A1 WO 2012133222A1 JP 2012057586 W JP2012057586 W JP 2012057586W WO 2012133222 A1 WO2012133222 A1 WO 2012133222A1
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WIPO (PCT)
Prior art keywords
processing
spindle
rotational speed
limit curve
stability limit
Prior art date
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Ceased
Application number
PCT/JP2012/057586
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English (en)
French (fr)
Japanese (ja)
Inventor
片岡　隆之
英二 名畑
律昭 小島
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Komatsu Ltd
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Komatsu Ltd
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Application filed by Komatsu Ltd filed Critical Komatsu Ltd
Priority to DE112012001500.2T priority Critical patent/DE112012001500B4/de
Priority to CN201280015657.4A priority patent/CN103476545B/zh
Priority to US14/003,822 priority patent/US9690281B2/en
Publication of WO2012133222A1 publication Critical patent/WO2012133222A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • 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
    • G05B2219/41115—Compensation periodical disturbance, like chatter, non-circular workpiece

Definitions

  • the present invention relates to a processing control device, and more particularly to a processing control device for controlling the rotational speed of a spindle on which a tool for cutting a workpiece is mounted, and a machine tool provided with the same.
  • the tool being cut is to cut while following the unevenness on the workpiece side left at the time of the previous cutting while shifting at the time of the next cutting.
  • the cutting thickness will vary.
  • the rigidity of the tool is weak as described above, the fluctuation of the cutting force excites the characteristic vibration of the tool and chatter vibration is easily generated during cutting.
  • Patent Document 1 a method of predicting chatter vibration using a stability limit curve and setting processing conditions has also been proposed.
  • parameters such as cutting force characteristic values determined by tool specifications and workpiece materials are used as input values, and an initial value of the stability limit cutting amount at which chatter vibration does not occur with respect to the input values is determined. It will be determined. Then, the calculated value obtained based on the initial value is compared with the initial value, and the initial value is corrected according to the comparison result. The above process is repeated, and when the corrected initial value and the calculated value fall within a certain error range, the stable limit cutting amount is determined.
  • FIG. 1 shows an example of the stability limit curve used in Patent Document 1.
  • the horizontal axis is the spindle rotational speed (rpm)
  • the vertical axis is the amount of axial cut (mm).
  • the area inside (lower side in the figure) of stability limit curve A is the stable area where chatter vibration is suppressed
  • the outside (upper side in the figure) of stability limit curve A is the unstable area where chatter vibration occurs is there.
  • the stability limit curve A Assuming that the stability limit curve A as described above is assumed, processing is performed under the condition of the a1 point in the stability region. At this time, errors and deviations occur in the variation in rigidity of the tool and in the dimensions of the workpiece material, so the actual stability limit curve (shown by a broken line A 'in FIG. 1) is the stability shown in FIG. It deviates from the limit curve A. Then, chatter vibration will occur even if processing is performed under the condition a1. In particular, since workpieces such as castings and forgings have large errors in material dimensions, the actual stability limit curve often deviates from the stability limit curve on the assumption of a predetermined material dimension. In such a case, chatter vibration will be generated in actual processing even if processing is performed with the most appropriate amount of inclusion a1 obtained by calculation.
  • An object of the present invention is to make it possible to easily and stably suppress frequent vibration generated during processing in a machine tool that performs cutting processing under conditions set based on a stability limit curve. .
  • a processing control apparatus for a machine tool is an apparatus for controlling the number of rotations of a spindle on which a tool for cutting a workpiece is mounted, and includes data storage means, processing start condition setting means, and vibration detection sensor And chattering vibration determination means and rotation speed control means.
  • the data storage means stores stability limit curve data indicating a limit infeed amount at which chatter vibration is suppressed with respect to the spindle rotational speed.
  • the processing start condition setting means sets the spindle rotation number and the amount of cutting of the tool at the start of processing based on the stability limit curve data.
  • the vibration detection sensor detects the vibration of the spindle at the time of cutting.
  • the chattering vibration determination means determines whether chattering vibration has occurred based on the detection result of the vibration detection sensor.
  • the rotation speed control means controls the spindle rotation speed so that chatter vibration is suppressed with reference to the stability limit curve data when chatter vibration occurs.
  • stability limit curve data is stored in the data storage means.
  • the stability limit curve data indicates the relationship between the spindle rotational speed at which chatter vibration is suppressed at the time of cutting and the limit infeed of the tool.
  • chatter vibration is suppressed and stable processing can be performed.
  • the spindle rotational speed at the start of machining and the amount of cutting of the tool are set. This setting may be set by the operator, or may be set automatically from the specifications of the tool to be used.
  • the vibration of the spindle is detected by the vibration detection sensor, and it is determined from the detection result whether chatter vibration has occurred. If it is determined that chatter vibration has occurred, the spindle speed is controlled so as to suppress chatter vibration with reference to the stability limit curve data.
  • chatter vibration can be suppressed by controlling the spindle rotational speed.
  • the processing start condition is set to the condition a1 with reference to the data of the stability limit curve.
  • the stability limit curve deviates to the curve A 'due to the variation of the tool rigidity and the error of the workpiece material dimension.
  • the processing condition a1 is in the unstable region, and chatter vibration occurs during processing.
  • the spindle rotational speed is reduced to shift the processing conditions to the a3 point.
  • the processing conditions are located within the stable region, and chatter vibration can be suppressed to enable stable processing.
  • the machining conditions in the unstable region can be easily shifted to the stable region by changing the spindle rotational speed. At this time, it is not necessary to significantly change the spindle rotational speed. Therefore, a significant reduction in processing efficiency can be avoided. Further, the process of controlling the spindle rotational speed does not need to change the machining program, and can be executed during machining, so that it can respond quickly according to the machining situation.
  • the processing control device for a machine tool according to a second aspect of the present invention is the processing control device according to the first aspect, wherein the stability limit curve data includes the characteristic value of the tool obtained by vibration analysis, the coefficient determined by the material of the work, and the processing conditions Desired.
  • the rotational speed control means comprises: first rotational speed changing means, determination means, second rotational speed changing means ,have.
  • the first rotation speed changing means increases or decreases the spindle rotation speed by the first rotation speed when chatter vibration occurs.
  • the determination means determines whether or not the spindle rotational speed adjusted by the first rotational speed is within the allowable range set based on the stability limit curve data.
  • the second rotation number changing means reduces the spindle rotation number by a second rotation number smaller than the first rotation number from the adjusted spindle rotation number if the adjusted spindle rotation number is not within the allowable range. increase.
  • the spindle rotational speed is first changed by the first rotational speed.
  • the range (permissible range) of the spindle rotational speed at which chatter vibration does not occur in a certain amount of infeed is determined.
  • the spindle rotational speed changed by the first rotational speed is within the allowable range. Then, if not within the allowable range, the spindle rotational speed is changed to the opposite side by a second rotational speed that is smaller than the first rotational speed. That is, when the spindle rotational speed is increased by the first rotational speed, it is lowered by the second rotational speed, and when it is lowered by the first rotational speed, it is increased by the second rotational speed.
  • a machining control device for a machine tool is the machining control device according to any of the first to third aspects, wherein the machining start condition setting means sets the depth of cut at the start of machining in the stable area in the stability limit curve data.
  • the cutting amount is set smaller than the maximum cutting amount, and the spindle rotation number at the start of machining is set to a rotation number lower than the rotation number corresponding to the maximum cutting amount in the stable area.
  • the rotation speed control means increases the spindle rotation speed by a predetermined rotation speed when chatter vibration occurs.
  • the depth of cut at the start of machining is set within the stable region, and the spindle rotational speed is set to the low rotational speed side within the stable region.
  • the depth of cut is set smaller than the maximum depth of cut (about 3.3 mm) in a certain stable region.
  • the spindle rotational speed is set to 2600 rpm, which is lower than the rotational speed (about 3000 rpm) corresponding to the maximum infeed amount.
  • the slope on the side where the spindle rotational speed is high is steeper than that on the low side because of the nature of the stability limit curve. Therefore, if the spindle rotational speed at the start of machining is set on the stable limit curve on the side where the spindle rotational speed is high, the condition goes back and forth between the stable area and the unstable area for a minute change in the spindle rotational speed. It will be. In such a state, it becomes difficult to stably suppress chatter vibration by controlling the spindle rotational speed.
  • the machining start condition is set on the side where the spindle rotational speed is low in the stable region to facilitate control of the spindle rotational speed to stably suppress chatter vibration.
  • a machining control device for a machine tool is the machining control device according to any of the first to third aspects, wherein the machining start condition setting means determines the cutting amount at the start of machining as the maximum cutting amount in the stable area in the stability limit curve data.
  • the spindle rotation number at the start of processing is set to a rotation number lower than the rotation number corresponding to the maximum cutting amount in the stable area while the cutting amount is set smaller, and the rotation number control means performs processing when chatter vibration does not occur. Maintain the spindle speed at start.
  • the spindle rotational speed is maintained at the rotation speed at the start of machining even in the above situation.
  • a machining control device for a machine tool is the machining control device according to any of the first to third aspects, wherein the machining start condition setting means determines the cutting amount at the start of machining as the maximum cutting amount in the stable area in the stability limit curve data.
  • the spindle rotation number at the start of machining is set to a rotation number higher than the rotation number corresponding to the maximum cutting amount in the stable region while the cutting amount is set smaller, and the rotation number control means performs the spindle when chatter vibration occurs.
  • the rotational speed is reduced by a predetermined rotational speed.
  • the stability region has a width in terms of spindle speed. Therefore, in the sixth aspect of the invention, in order to shorten the processing time, the processing start condition is set to a relatively high rotational speed (for example, 3000 rpm in the example of FIG. 1).
  • a machining control device for a machine tool is the machining control device according to any of the first to third aspects, wherein the machining start condition setting means measures the depth of cut at the start of machining from the maximum depth of cut in the stable area in the stability limit curve data.
  • the spindle rotation number at the start of machining is set to a rotation number higher than the rotation number corresponding to the maximum depth of cut in the stable area, and the rotation number control means starts machining when chatter vibration does not occur. Maintain spindle rotation speed at When the machining start condition is set to the highest spindle speed in the stable region and the actual stability limit curve shifts to the high rotation speed side, chatter vibration does not occur even with the machining start condition. Therefore, it is conceivable to further increase the spindle rotational speed to shorten the machining time.
  • the spindle rotational speed is maintained at the rotational speed at the start of machining.
  • a machine tool comprises a spindle having a cutting tool mounted at its tip, a numerical control unit that sets and controls machining conditions including the cutting amount of the cutting tool and the number of revolutions of the spindle, and controls the numerical control unit
  • the processing control device according to any one of claims 1 to 7, which sends a command.
  • a machining control method of a machine tool is a machining control method of a machine tool in which a cutting tool is mounted on a spindle of the machine tool, and includes a first step to a sixth step.
  • first step from the characteristic value of the cutting tool, the coefficient determined depending on the material of the workpiece, and the processing conditions, stability limit curve data indicating the limit cutting amount at which chatter vibration is suppressed with respect to the spindle rotational speed is determined.
  • the spindle rotational speed and the tool cutting amount are set as processing conditions at the start of processing.
  • machining is started under machining start conditions.
  • the vibration of the spindle at the time of cutting is detected.
  • the spindle rotational speed is controlled so that chatter vibration is suppressed with reference to the stability limit curve data.
  • BRIEF DESCRIPTION OF THE DRAWINGS The system block diagram of the whole machine tool by one Embodiment of this invention.
  • the figure for demonstrating the logic for determination of increase / decrease in the spindle rotational speed by other embodiment of this invention. 7 is a flowchart of control processing according to another embodiment of the present invention.
  • the cause of chatter vibration is due to the variation in cutting thickness during cutting. This state is shown in FIG. As shown in FIG. 2 (a), the tool being cut cuts while making a slight shift in the next cutting process while following the ups and downs left during the previous cutting. For this reason, as shown in FIG. 6B, the cutting thickness fluctuates, which becomes the excitation force that is the cause of the chatter vibration, and the natural vibration is excited to generate the chatter vibration.
  • chatter vibration can be suppressed by controlling the number of rotations of the spindle according to the natural frequency of the tool so that the cutting thickness becomes constant. That is, chatter vibration can be suppressed by setting the cutting amount by the tool and the cutting cycle in a predetermined relationship.
  • the cutting cycle can be converted to the number of rotations if the number of blades of the tool is known.
  • the motion of the tool during cutting is expressed by the following equation of motion using mass m, damping constant c, spring constant k, and external force Ff.
  • Kf is a specific cutting resistance, which is a value determined by the material of the work.
  • a is the amount of axial cuts
  • h is the thickness of the cut
  • T is the time delay (cutting cycle) in the cutting process.
  • the damping constant c and the spring constant k of the cutting tool can be determined by analyzing the vibration of the tool.
  • a stability limit curve can be obtained by solving the above equation of motion. Then, when the stability limit curve is obtained, generation of chatter vibration can be suppressed by setting the processing conditions within the stability region.
  • the actual stability limit curve deviates from the calculated stability limit curve.
  • the error in the material dimensions is large, the variation in the depth of cut also becomes large, and chatter vibration may occur even if the processing conditions are set in the stable region in the stability limit curve.
  • the machining start condition is set with reference to the stability limit curve, and chatter vibration is detected during machining, and when chatter vibration occurs, the spindle rotational speed is adjusted with reference to the stability limit curve. I try to suppress chatter vibration.
  • FIG. 4 is a block diagram of the entire machine tool system according to an embodiment of the present invention.
  • the present system includes a machine tool main body 1, a numerical control device (NC device) 2 for controlling machining of the machine tool main body 1, and a cutting amount and a spindle rotational speed for the numerical control device 2.
  • a control device 3 for instructing.
  • the machine tool main body 1 is provided with a main spindle 1a that is rotated by a motor, and a cutting tool 4 is attached to the tip of the main spindle 1a.
  • the spindle 1 a is provided with a vibration detection sensor 5 for measuring the vibration of the spindle 1 a.
  • an accelerometer is used as the vibration detection sensor 5.
  • the numerical control device 2 is provided with a storage device in which a processing program is stored, and an operation panel for setting processing conditions.
  • the control device 3 includes a Fourier transform unit (FFT) 6 that performs fast Fourier transform on the signal from the vibration detection sensor 5, a storage unit 7 in which data of the stability limit curve is stored, and an operation unit 8 that performs various operations.
  • Arithmetic unit 8 has a function of determining whether or not chatter vibration is generated by an input from Fourier transform unit 6, and instructs numerical control device 2 to adjust the spindle rotational speed when chatter vibration is generated.
  • the computing unit 8 has a function to determine whether or not the spindle rotational speed exceeds a preset maximum or minimum value (set limit value) when the spindle rotational speed is adjusted. .
  • the storage unit 7 includes a set limit value, a threshold value for determining the presence or absence of chattering through the input device 9 such as a keyboard, an adjustment rotational speed ( ⁇ ) when adjusting the spindle rotational speed, etc. Is to be input.
  • the input device 9 is also used by the operator to set the spindle rotational speed and the amount of infeed of the tool at the start of machining with reference to the data of the stability limit curve.
  • the spindle rotational speed at the start of machining and the tool cutting amount may be input from the operation panel of the numerical control device 2.
  • the spindle rotation number at the start of machining and the tool cutting amount may be determined by the calculation unit 8 and may be set in the numerical control device 2.
  • the method of controlling the spindle rotational speed includes the following steps.
  • Second step Chatter vibration is suppressed with respect to the spindle rotational speed from the characteristic value (mass, damping constant, spring constant) of the cutting tool, the coefficient (specific cutting resistance) determined by the material of the work, and the processing conditions (external force) Determine the stability limit curve data that indicates the limit cut amount.
  • the stability limit curve data is obtained before the start of processing, and is stored in the storage unit 7 of the control device 3.
  • Second step Based on the stability limit curve data, the spindle rotational speed and the tool cutting amount are set as processing conditions at the start of processing. These conditions are input by the operator via the control unit 3 or the numerical control unit 2. Alternatively, it may be set automatically using stability limit curve data.
  • Third step The processing is started under the processing start condition set in the second step.
  • the preparation process P1 When performing the control process for adjusting the spindle rotational speed, first, the preparation process P1 is performed.
  • a stability limit curve is determined by solving the above-mentioned equation from the used tool specification, the material of the workpiece as the material to be cut, and the processing conditions. Then, when the stability limit curve is obtained, the spindle rotation number Rs (rpm) and the infeed amount a (mm) are set as the processing start condition in the preparation step 2 with reference to the stability limit curve. These conditions are input by the operator.
  • control processing in step S1 and subsequent steps is performed.
  • step S1 a command to start processing is sent to the numerical control device 2.
  • step S2 a detection signal from the vibration detection sensor 5 is acquired, and in step 3, it is determined whether chattering vibration occurs.
  • the detection signal from the vibration detection sensor 5 is fast Fourier transformed by the Fourier transform unit 6 to obtain the amplitude Fp of the dominant frequency with the strongest power. Then, it is determined whether this amplitude Fp is equal to or greater than a predetermined threshold value F0.
  • step S4 the command value of the spindle rotational speed to the numerical control device 2 (hereinafter, the "command value of the spindle rotational speed" is simply described as “spindle rotational speed") is increased by the rotational speed ⁇ (rpm).
  • the processing conditions shift to condition C1 shown in FIG.
  • step S5 processing for counting the number of times the spindle rotational speed has been increased is executed.
  • the initial value of "n” is "1", and is incremented by one each time the rotational speed is increased.
  • step S6 it is determined whether the adjusted spindle rotational speed (Rs1 + ⁇ ) does not exceed the set limit value (here, the set maximum rotational speed Rmax).
  • the set maximum rotation speed Rmax is preset with reference to the data of the stability limit curve obtained in the preparation process P1.
  • the maximum main spindle rotational speed within the stable area range in the infeed amount a is R2
  • the rotational speed obtained by multiplying this rotational speed R2 by 1.2 is set as the set maximum rotational speed Rmax.
  • the actual stability limit curve often deviates from the calculated stability limit curve A, and the maximum rotation speed is shifted to the high rotation speed side in consideration of this deviation. ing.
  • step S6 when the adjusted spindle rotational speed (Rs1 + ⁇ ) does not exceed the set maximum rotational speed Rmax, the process proceeds from step S6 to step S7.
  • step S7 a change instruction of the spindle rotational speed is transmitted to the numerical control device 2, and the process returns to step S2.
  • step S8 the rotational speed is reduced by ⁇ / n from the previously adjusted spindle rotational speed (Rs1 + ⁇ ). That is, when the number of times of adjustment of the spindle rotational speed is the first, the rotational speed is decreased by ⁇ / 2 (rpm) from the adjusted spindle rotational speed, and the process proceeds to step S7 to change the spindle rotational speed change command into numerical controller 2 , And returns to step S2.
  • step S2 The spindle rotational speed is changed by the above processing. Then, the processing from step S2 to step S8 is repeatedly executed, and if the processing is finished without the occurrence of chatter vibration, the control processing is finished through step S9.
  • step S8 If chatter vibration occurs even if the spindle rotational speed is lowered in the first process of step S8, the spindle rotational speed is further lowered by ⁇ / (2 + 1), and the same process is executed.
  • step S3 it is determined as NO in step S3 until the processing is completed, and step S2 and step S3 are repeatedly executed to end the control processing by the completion of processing.
  • step S11 to step S13 the processing from step S11 to step S13 is the same as processing 1 and thus will be omitted.
  • the actual stability limit curve A ′ may be shifted to a lower rotational speed side than the calculated stability limit curve A.
  • chatter vibration is generated.
  • step S14 the spindle rotational speed Rs2 is decreased by ⁇ (rpm). As a result, the processing conditions shift to condition C2 shown in FIG. Further, in step S15, a process for counting the number of times the rotational speed has been lowered is executed.
  • step S16 it is determined whether or not the adjusted spindle rotational speed (Rs2- ⁇ ) is lower than the set limit value (here, the set minimum rotational speed Rmin).
  • the set minimum rotation number Rmin is a rotation number obtained by multiplying the minimum rotation number R1 of the stable region in the infeed amount a by 0.8 in FIG.
  • the rotation speed R1 is multiplied by 0.8 because the actual stability limit curve often deviates from the calculated stability limit curve A in the same manner as described above, and the minimum rotation speed set in consideration of this deviation (Rmin) is shifted to the low rotation speed side.
  • step S16 when the adjusted spindle rotational speed (Rs2- ⁇ ) is equal to or greater than the set minimum rotational speed Rmin, the process proceeds from step S16 to step S17.
  • step S17 a change instruction of the spindle rotational speed is transmitted to the numerical control device 2, and the process returns to step S12.
  • step S16 If the adjusted spindle rotational speed (Rs2- ⁇ ) is lower than the set minimum rotational speed Rmin, the process proceeds from step S16 to step S18.
  • step S18 the rotational speed is increased by ⁇ / n from the adjusted spindle rotational speed (Rs2- ⁇ ). Then, the process proceeds to step S17 to transmit a spindle rotational speed change command to the numerical control device 2, and the process returns to step S12.
  • the actual stability limit curve A ′ may be shifted to a higher rotational speed side than the calculated stability limit curve A.
  • the condition B2 of the infeed amount a at the spindle rotational speed Rs2 set as the processing start condition is within the stable region. Therefore, chattering vibration does not occur.
  • condition B2 may shift out of the stable region. Even if the spindle speed is increased to such an extent that chatter vibration does not occur, machining is also possible. We can not expect significant reduction of time. Therefore, in this case, the spindle rotational speed is maintained at the rotational speed at the start of machining.
  • chatter vibration occurs during cutting, chatter vibration can be suppressed by controlling the spindle rotational speed. Furthermore, since chatter vibration can be suppressed without significantly changing the spindle rotational speed, a significant reduction in machining efficiency can be avoided. In addition, since the process of controlling the spindle rotational speed does not need to change the machining program, it can be executed during machining, and can be quickly responded to the machining situation.
  • the machining start condition is automatically set, it may not be known at which position in the stable area the spindle rotational speed at the time of machining start is.
  • the processing start condition should be set within the stable region in terms of calculation.
  • the set processing start condition may be deviated out of the stable region in practice.
  • the data of the stability limit curve A is stored in the storage unit 7 as a two-dimensional table of the cutting amount with respect to the spindle rotational speed. With reference to the data in the table and the data of the machining start condition, it is determined whether to increase or decrease the spindle rotational speed. Specifically, as shown in FIG. 11A, it is assumed that data DS is set as the processing start condition with reference to the table of the stability limit curve A.
  • FIG. 1 A flowchart for control processing of the spindle rotational speed including the above determination is shown in FIG. In this flowchart, the processing of steps S21 to S23, 27, 29 is the same as that of the above embodiment.
  • the machining start condition is set within the stable region, but the stability limit curve deviates from the calculated curve due to the error of the workpiece material size, etc., and the automatically set machining start condition goes out of the stable region. It may shift. In this case, chatter vibration occurs during processing.
  • step S23 it is determined whether to increase or decrease the spindle rotational speed using the above-described logic described with reference to FIG.
  • step S24 the spindle rotational speed for the numerical control device 2 is increased or decreased by a predetermined rotational speed ( ⁇ ) based on the determination at step S30.
  • step S25 processing for counting the number of times the spindle rotational speed has been adjusted is executed. As described above, the initial value of “n” is “1”, and is incremented by “1” each time the rotational speed is adjusted.
  • step S26 with reference to the data of the stability limit curve A, it is determined whether the adjusted spindle rotational speed is within the set limit value range. That is, it is determined whether the adjusted spindle rotational speed exceeds the set minimum rotational speed Rmin and is less than the set maximum rotational speed Rmax.
  • the respective rotational speeds Rmin and Rmax are preset in the same manner as in the above embodiment.
  • step S26 If the adjusted spindle rotational speed is within the range of the allowable rotational speed, the process proceeds from step S26 to step S27.
  • step S27 a change instruction of the spindle rotational speed is transmitted to the numerical control device 2, and the process returns to step S22.
  • step S28 the previously adjusted spindle rotational speed is adjusted in the reverse direction. That is, when the number of times of adjustment of the spindle rotational speed is the first, the rotational speed is adjusted by ⁇ / 2 (rpm) from the adjusted spindle rotational speed in the opposite direction to step S24, and the process proceeds to step S27 and the spindle rotational A number change command is transmitted to the numerical control device 2, and the process returns to step S22.
  • step S22 The spindle rotational speed is changed by the above processing. Then, the processing in step S22 and the subsequent steps is repeatedly executed, and if the processing is completed without the occurrence of chatter vibration, the control processing is completed through step S29.
  • step S28 If chatter vibration occurs even if the spindle rotational speed is adjusted in the reverse direction in the first process of step S28, the spindle rotational speed is further adjusted by ⁇ / (2 + 1), and the same process is executed.
  • the depth of cut at the start of processing is set to 1/22 of the highest depth of cut of the stability limit curve, but this value is an example and is not limited.
  • control device 3 is provided separately from the numerical control device 2 of the machine tool, but the control device 3 may be incorporated in the numerical control device 2.

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PCT/JP2012/057586 2011-03-31 2012-03-23 工作機械及びその加工制御装置 Ceased WO2012133222A1 (ja)

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Application Number Priority Date Filing Date Title
DE112012001500.2T DE112012001500B4 (de) 2011-03-31 2012-03-23 Maschinenwerkzeug und Bearbeitungssteuervorrichtung derselben
CN201280015657.4A CN103476545B (zh) 2011-03-31 2012-03-23 机床及其加工控制装置
US14/003,822 US9690281B2 (en) 2011-03-31 2012-03-23 Machine tool and machining control device thereof

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JP2011080696A JP5258921B2 (ja) 2011-03-31 2011-03-31 工作機械及びその加工制御装置
JP2011-080696 2011-03-31

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