WO2015162739A1 - 数値制御装置 - Google Patents
数値制御装置 Download PDFInfo
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- WO2015162739A1 WO2015162739A1 PCT/JP2014/061488 JP2014061488W WO2015162739A1 WO 2015162739 A1 WO2015162739 A1 WO 2015162739A1 JP 2014061488 W JP2014061488 W JP 2014061488W WO 2015162739 A1 WO2015162739 A1 WO 2015162739A1
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- vibration
- movement
- movement path
- phase difference
- path
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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
- G05B19/19—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 positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
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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
- G05B19/41—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 interpolation, e.g. the computation of intermediate points between programmed end points to define the path to be followed and the rate of travel along that path
- G05B19/4103—Digital interpolation
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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
-
- 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
- G05B2219/36—Nc in input of data, input key till input tape
- G05B2219/36204—Lathe, turning
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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
- G05B2219/49—Nc machine tool, till multiple
- G05B2219/49384—Control of oscillatory movement like filling a weld, weaving
-
- 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
- G05B2219/50—Machine tool, machine tool null till machine tool work handling
- G05B2219/50047—Positioning, indexing
-
- 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
- G05B2219/50—Machine tool, machine tool null till machine tool work handling
- G05B2219/50049—Control machine as function of position, angle of workpiece
Definitions
- the present invention relates to a numerical control device.
- a numerical control device having a cutting tool feed mechanism that feeds a cutting tool to a workpiece and a control mechanism that controls a cutting tool feed drive motor by vibrating the cutting tool at a low frequency is known. It has been proposed (see, for example, Patent Documents 1 to 3).
- the control mechanism feeds the cutting tool in synchronization according to the operating means for performing various settings, and the workpiece rotation speed set by the operating means or the cutting tool feed amount per one cutting tool rotation.
- the vibration control is divided into forward movement and backward movement, and the forward distance / speed and the backward distance / speed are individually defined in the vibration condition table as vibration conditions, so that the low frequency vibration cutting is performed. Is related to the cutting feed rate and amplitude. Therefore, there has been a problem that low-frequency vibration cannot be performed at a speed other than the cutting feed speed that matches the vibration conditions defined in the vibration condition table.
- the present invention has been made in view of the above, and an object of the present invention is to obtain a numerical control device capable of freely selecting an arbitrary cutting feed rate in a numerical control device that performs cutting while vibrating at a low frequency. .
- a numerical control device moves a tool and a processing target along a moving path while relatively vibrating with a drive shaft provided on the tool or the processing target.
- a numerical control device that performs processing on the processing target, and is generated based on a command block in a processing program from a ratio of an amplitude of the vibration specified at the time of movement and a feed rate of the tool to the processing target.
- Phase difference calculating means for calculating a time lag of the vibration backward position with respect to the vibration forward position as a phase difference, and for each drive shaft using the vibration forward position and the vibration backward position based on the phase difference as the movement path for each drive shaft.
- a vibration movement amount generating means characterized in that it comprises a displacement synthesizing unit that the synthetic moving amount obtained by adding the vibration movement amount to the movement path generating for each of said drive shaft.
- the movement path is generated using the phase difference that is the time delay of the vibration retreat position with respect to the vibration advance position and the machining program, so that the user can perform any cutting feed in the low-frequency vibration cutting.
- the phase difference can be calculated from the vibration amplitude and the ratio of the feed rate of the tool to the machining target, and can also be used for relative movement accompanied by vibration between the tool and the machining target depending on parameters and the machining program. Can be specified.
- FIG. 1 is a block diagram showing an example of the configuration of the numerical control apparatus according to the first embodiment.
- FIG. 2 is a diagram schematically showing the configuration of the shaft of the numerical control apparatus according to Embodiment 1 that performs turning.
- FIG. 3 is a diagram schematically showing a method of processing while applying low-frequency vibration.
- FIG. 4 is a diagram schematically illustrating an example of a procedure of movement amount calculation processing in the interpolation processing unit according to the first embodiment (part 1).
- FIG. 5 is a diagram schematically illustrating an example of a movement amount calculation process performed by the interpolation processing unit according to the first embodiment (part 2).
- FIG. 6 is a diagram illustrating an example of a machining program and parameters when the vibration amplitude feed ratio is stored in the storage unit as a parameter.
- FIG. 7 is a diagram showing an example of a machining program in which a vibration amplitude feed ratio is designated.
- FIG. 8 is a diagram illustrating a movement path with respect to time in the X-axis direction.
- FIG. 9 is a block diagram showing an example of the configuration of the numerical controller according to the second embodiment.
- FIG. 10 is a diagram illustrating an example of a machining program and parameters when the phase difference is stored in the storage unit as a parameter.
- FIG. 11 is a diagram illustrating an example of a machining program in which a phase difference is designated.
- FIG. 12 is a diagram illustrating a movement path with respect to time in the X-axis direction.
- FIG. 1 is a block diagram showing an example of the configuration of the numerical control apparatus according to the first embodiment.
- the numerical control device 1 includes a drive unit 10, an input operation unit 20, a display unit 30, and a control calculation unit 40.
- the drive unit 10 is a mechanism that drives one or both of the machining target and the tool in at least two axial directions.
- a servo motor 11 that moves a workpiece or a tool in each axial direction defined on the numerical control device 1
- a detector 12 that detects the position / speed of the servo motor 11, and a detector 12 detect the servo motor 11.
- Each axis servo control unit 13 (X-axis servo control unit 13X, Z-axis servo control unit 13Z,..., Which controls the position and speed of the object to be processed or the tool based on the position / speed is described below. In the case where it is not necessary to distinguish the direction of the drive shaft, it is simply expressed as a servo control unit 13).
- the detector 15 that detects the position / rotation speed of the spindle motor 14, and the position / rotation speed detected by the detector 15, A spindle control unit 16 that controls rotation.
- the input operation unit 20 is configured by input means such as a keyboard, a button, or a mouse, and a user inputs a command or the like to the numerical control device 1 or inputs a machining program or a parameter.
- the input operation unit 20 includes a cutting feed rate changing unit 201 that can change the cutting feed rate.
- the cutting feed speed changing unit 201 is constituted by a dial, for example, and can change the current cutting feed speed by rotating the dial.
- the change of the cutting feed rate by the cutting feed rate changing unit 201 is input to a parameter 431 included in the control calculation unit 40, for example.
- the display unit 30 is configured by display means such as a liquid crystal display device, and displays information processed by the control calculation unit 40.
- the control calculation unit 40 includes an input control unit 41, a data setting unit 42, a storage unit 43, a screen processing unit 44, an analysis processing unit 45, a machine control signal processing unit 46, and a PLC (Programmable Logic Controller) circuit.
- the input control unit 41 receives information input from the input operation unit 20.
- the data setting unit 42 stores the information received by the input control unit 41 in the storage unit 43. For example, when the input content is an edit of the machining program 432, the edited content is reflected in the machining program 432 stored in the storage unit 43, and when a parameter is input, the parameter 431 in the storage unit 43 is reflected. To be stored in the storage area.
- the storage unit 43 stores information such as the parameters 431 used in the processing of the control calculation unit 40, the machining program 432 to be executed, the screen display data 433 to be displayed on the display unit 30, and the like.
- the storage unit 43 is provided with a shared area 434 for storing temporarily used data other than the parameters 431 and the machining program 432.
- the parameter 431 may include a vibration amplitude feed ratio 4311 that defines a ratio between the vibration amplitude and the feed speed when creating the movement path.
- the vibration amplitude feed ratio 4311 is stored when specified by the parameter 431 instead of the machining program 432.
- the parameter 431 may store a vibration condition.
- the screen processing unit 44 performs control to display the screen display data 433 in the storage unit 43 on the display unit 30.
- the analysis processing unit 45 includes a movement command generation unit 451, a vibration command analysis unit 452, and a vibration amplitude feed ratio analysis unit 453.
- the movement command generation unit 451 reads a machining program including one or more blocks, analyzes the read machining program for each block, and generates a movement command for movement in one block.
- the vibration command analysis unit 452 analyzes whether the machining program includes a vibration command. When the vibration command is included, the vibration command analysis unit 452 generates vibration information such as frequency and amplitude included in the vibration command.
- the amplitude of the vibration command included in the machining program is preferably 1 micron or more and 300 microns or less.
- the frequency is preferably 10 Hz or more and 300 Hz or less. This is because if the frequency is lower than 10 Hz, the effect of vibration cutting cannot be obtained, and if it is higher than 300 Hz, the servo system cannot respond.
- the vibration amplitude feed ratio analysis unit 453 analyzes whether or not the vibration amplitude feed ratio is included in the machining program, and if it is included, acquires the vibration amplitude feed ratio.
- the machine control signal processing unit 46 confirms that the auxiliary command is instructed when the analysis processing unit 45 reads an auxiliary command as a command for operating a machine other than the command for operating the numerical control axis (drive axis). Notify the PLC circuit unit 47.
- the PLC circuit unit 47 receives a notification from the machine control signal processing unit 46 that an auxiliary command has been issued, the PLC circuit unit 47 executes processing corresponding to the auxiliary command.
- the interpolation processing unit 48 includes a phase difference calculation unit 481, a movement path generation unit 482, a vibration waveform generation unit 483, a vibration movement amount generation unit 484, and a movement amount synthesis unit 485.
- the phase difference calculation unit 481 calculates the phase difference from the vibration amplitude feed ratio acquired from the analysis processing unit 45 or the storage unit 43.
- the phase difference indicates the time delay of the vibration backward position with respect to the vibration forward position created based on the command.
- the movement path generation unit 482 generates a movement path for the time in each axis direction in a unit time (interpolation period) using the phase difference calculated by the phase difference calculation unit 481.
- the movement path with respect to time based on the target command block is set as the vibration advance position
- the movement path obtained by translating the vibration advance position in the direction of delaying the time by the phase difference is obtained as the vibration retreat position.
- the vibration waveform generation unit 483 generates, for each axis, a vibration waveform that serves as a reference for vibrating the tool or the processing object from the vibration command acquired from the analysis processing unit 45 or the storage unit 43.
- the reference vibration waveform indicates a position in each axial direction with respect to time. Any reference vibration waveform can be used, but here the vibration waveform is assumed to be a triangular wave.
- the triangular wave has an amplitude of 1.0, and the period has a value specified by the vibration condition.
- the vibration movement amount generation unit 484 obtains a difference between the vibration advance position and the vibration retreat position at each time, and calculates a vibration movement amount obtained by multiplying this by a vibration waveform for each axis.
- the movement amount synthesizing unit 485 adds the vibration retreat position generated by the movement path generation unit 482 and the vibration movement amount generated by the vibration movement amount generation unit 484, and adds each movement amount per unit time (interpolation cycle). Calculate the combined movement amount of the axes.
- the acceleration / deceleration processing unit 49 converts the combined movement amount of each drive axis output from the interpolation processing unit 48 into a movement command per unit time considering acceleration / deceleration in accordance with a previously specified acceleration / deceleration pattern.
- the axis data output unit 50 outputs the movement command per unit time processed by the acceleration / deceleration processing unit 49 to the servo control units 13X, 13Z,.
- FIG. 2 is a diagram schematically showing the configuration of the shaft of the numerical control apparatus according to Embodiment 1 that performs turning.
- a Z axis and an X axis that are orthogonal to each other in the drawing are provided.
- FIG. 2 (a) shows a case where only the tool 62, which is a turning tool for performing turning, for example, is moved in the Z-axis and X-axis directions while the object to be processed 61 is fixed, and FIG.
- This is a case where the object 61 is moved in the Z-axis direction and the tool 62 is moved in the X-axis direction.
- the processing described below can be performed.
- FIG. 3 is a diagram schematically showing a processing method while applying low-frequency vibration.
- a case is shown in which Z-axis and X-axis that are orthogonal to each other in the plane of the paper are provided, and machining is performed while relatively moving the tool 62 and the machining target along the movement path 101 in the ZX plane.
- the tool 62 when the tool 62 is moved relative to the machining target along the movement path 101, the tool 62 is vibrated so as to follow the movement path 101. That is, the tool 62 is vibrated so as to reciprocate along a straight line in a straight section, and the tool 62 is vibrated so as to reciprocate along a curved line in a curved section.
- the description of vibrating the tool 62 is a relative movement of the tool 62 with respect to the processing target 61, and actually, either the tool 62 or the processing target 61 may be moved as shown in FIG. 2. The following description is also the same.
- 4 and 5 are diagrams schematically illustrating an example of the procedure of the movement amount calculation process in the interpolation processing unit according to the first embodiment.
- the movement command generation unit 451 of the analysis processing unit 45 generates a movement command including a start point and an end point from the command block of the machining program, and outputs the movement command to the interpolation processing unit 48.
- the vibration command analysis unit 452 outputs a vibration condition including the frequency and amplitude included in the machining program or set by parameters to the interpolation processing unit 48, and the vibration amplitude feed ratio analysis unit 453 outputs the vibration condition to the machining program.
- the included vibration amplitude feed ratio or the vibration amplitude feed ratio set by the parameter is output to the interpolation processing unit 48.
- the phase difference calculation unit 481 obtains the phase difference W from the vibration amplitude feed ratio acquired from the analysis processing unit 45 or the storage unit 43.
- phase difference W is expressed by the following equation (4).
- a / W F / T (3)
- the phase difference calculation unit 481 calculates the phase difference W using the vibration amplitude feed ratio and the equation (4) in this way.
- the movement path generation unit 482 generates a movement path with respect to time in each axis direction from the target command.
- the type of machining is cutting vibration
- two types of paths of the vibration forward position R 1 and the vibration backward position R 2 are created using the phase difference calculated by the phase difference calculation unit 481.
- the vibration forward position R 1 is a path generated based on the movement command acquired from the movement command generation unit 451, and the same until the vibration backward position R 2 reaches the movement end point when the movement end point is reached. Generated to stay in position.
- the vibration backward position R 2 starts moving after waiting for the phase difference W after the movement of the vibration forward position R 1 is started.
- FIG. 4B shows the axial vibration advance position R 1 and the vibration retreat position R 2 created according to such a rule.
- the vibration waveform generation unit 483 generates a reference vibration waveform to be superimposed on the movement path using the vibration condition from the vibration command analysis unit 452. Specifically, a vibration waveform having a frequency in a vibration condition and having an amplitude (height from a valley to a mountain) of 1 is generated. At this time, a predetermined waveform (for example, a triangular wave) is used as the vibration waveform. A reference vibration waveform in the X-axis direction and the Z-axis direction generated by such a rule is shown in FIG. This reference vibration waveform is a function of time.
- the vibration movement amount generation unit 484 obtains the difference between the vibration forward position and the vibration backward position at each time.
- the difference between the vibration advance position and the vibration retreat position in the axial direction is shown in FIG.
- the vibration movement amount generation unit 484 multiplies the difference between the vibration advance position and the vibration retreat position by the reference vibration waveform generated by the vibration waveform generation unit 483 to calculate the vibration movement amount. That is, in each axis direction, the vibration movement amount is calculated by multiplying the graph of FIG. 4C and the graph of FIG. The axial movement amount calculated in this way is shown in FIG.
- the movement amount combining unit 485 superimposes (adds) the vibration retreat position generated by the movement path generation unit 482 and the vibration movement amount generated by the vibration movement amount generation unit 484 for each axis. Generate a travel path for time.
- the axial movement path R 3 generated in this way is shown in FIG.
- the vibration retracted position of the moving path R 3 has reached the target position, the moving path R 3 Does not exceed the target position. Thereafter, the vibration retracted position of the moving path R 3 has reached the target position while gradually decreasing the amplitude.
- the vibration retreat position of the movement path R 3 reaches the target position and the vibration converges, a command with the next vibration is executed so as to have the set vibration amplitude feed ratio. This completes the movement amount calculation process.
- the waveform is calculated in units of one block of the machining program.
- the interpolation processing unit 48 performs each unit time (interpolation cycle). The calculation will be performed.
- the vibration amplitude feed ratio may be stored in the storage unit 43 as the parameter 431, or may be set in the machining program.
- FIG. 6 is a diagram illustrating an example of a machining program and parameters when the vibration amplitude feed ratio is stored in the storage unit as a parameter.
- the machining program 432 is read and executed for each row (block) shown in FIG.
- the command “G0 X0.0;” indicated by the sequence number “N01” in the machining program 432 is a positioning command.
- the command “G165 P1” means the start of the vibration cutting control mode.
- “F” and a numerical value subsequent thereto mean a cutting feed amount (for example, mm) during one rotation of the main shaft.
- the cutting feed command is 0.05 mm / r.
- a cutting feed rate per minute may be used as the cutting feed speed.
- the cutting feed command is 0.10 mm / r.
- the command “G165 P0;” indicated by the sequence number “N05” means the end of the vibration cutting control mode.
- the parameter 431 stores “2.0” as the parameter setting value of the vibration amplitude feed ratio.
- FIG. 7 is a diagram showing an example of a machining program in which the vibration amplitude feed ratio is specified.
- the content of FIG. 7 is basically the same as that of FIG. However, it differs from that in FIG. 6A in that the vibration amplitude feed ratio is set by “Q” in the command for starting the vibration cutting control mode of sequence number “N02”.
- FIG. 8 is a diagram showing a movement path with respect to time in the X-axis direction
- (a) is a diagram showing a movement path in the X-axis direction with respect to time generated according to FIG. 6 or FIG. It is the figure which expanded the part of A of (a)
- (c) is the figure which expanded the part of B of (a).
- the horizontal axis indicates the required time T per main shaft rotation
- the vertical axis indicates the X-axis position.
- the inclination of the vibration advance position R 1 and the vibration retreat position R 2 is equal to the feed amount F per revolution and is 0.05 mm. Further, the amplitude A is obtained by modifying the equation (1) to be 0.10 mm.
- the horizontal axis indicates the required time T per rotation of the main shaft
- the vertical axis indicates the X-axis position.
- the inclination of the vibration advance position R 1 and the vibration retreat position R 2 is equal to the feed amount F per rotation and is 0.10 mm.
- the cutting feed rate changing unit 201 of the input operation unit 20 When the cutting feed rate changing unit 201 of the input operation unit 20 is operated and the cutting feed rate is changed, the cutting feed rate is changed while the vibration amplitude feed ratio remains set as described above. Will be changed. For example, in FIG. 8, the inclination of the movement path changes with the vibration amplitude feed ratio unchanged. Even when the cutting feed rate is changed by the cutting feed rate changing unit 201 as described above, the same processing as described above is performed.
- the vibration amplitude feed ratio is set as a parameter or the vibration amplitude feed ratio is set as a machining program, and a movement path in each axial direction with vibration is generated based on the vibration amplitude feed ratio. This has the effect that the user can freely select the cutting feed rate in low-frequency vibration cutting.
- the cutting feed speed changing unit 201 is provided so that the cutting feed speed can be changed during low-frequency vibration cutting and the vibration amplitude feed ratio is maintained, that is, the vibration amplitude feed ratio is double the cutting feed speed with the changed amplitude. So that the movement route is changed. This has the effect that the cutting feed rate can be changed freely (in real time, continuously) even during low-frequency vibration cutting.
- the first axis position on the movement path at the time when the main shaft reaches a certain rotation phase and the second axis position on the movement path at the time when the main shaft reaches the rotation phase after one rotation or more.
- Embodiment 2 FIG. In the first embodiment, the machining is performed at a constant vibration amplitude feed ratio during the cutting process with low-frequency vibration. In the second embodiment, a case will be described in which processing is performed with a constant phase difference instead of the vibration amplitude feed ratio.
- FIG. 9 is a block diagram showing an example of the configuration of the numerical controller according to the second embodiment.
- the configurations of the storage unit 43, the analysis processing unit 45, and the interpolation processing unit 48 are different from those of the first embodiment.
- the parameter 431 in the storage unit 43 may include a phase difference 4312 instead of the vibration amplitude feed ratio 4311.
- the phase difference 4312 is stored when the parameter 431 is specified instead of the machining program 432.
- the phase difference 4312 is obtained by subtracting the amplitude of the vibration condition (time) from the path created based on the movement command at a certain position that passes through the movement command.
- the analysis processing unit 45 includes a phase difference analysis unit 454 instead of the vibration amplitude feed ratio analysis unit 453.
- the phase difference analysis unit 454 analyzes whether or not the phase difference is included in the machining program 432, and if it is included, acquires the phase difference.
- the interpolation processing unit 48 does not include the phase difference calculation unit 481. Further, the movement path generation unit 482 does not use the phase difference calculated by the phase difference calculation unit 481, but uses the phase difference acquired from the analysis processing unit 45 or the storage unit 43 in unit time (interpolation cycle). A movement path with respect to time in each axial direction is generated.
- symbol is attached
- the processing method by the numerical control device 1 according to the second embodiment is the same as that shown in FIG. 4 except that the processing for calculating the phase difference in FIG. .
- the phase difference may be stored in the storage unit 43 as the parameter 431 or may be set in the machining program 432.
- FIG. 10 is a diagram illustrating an example of a machining program and parameters when the phase difference is stored in the storage unit as a parameter.
- the machining program 432 shown in FIG. 10A is the same as that shown in FIG. 6A of the first embodiment.
- the parameter 431 stores “2.0” as the parameter setting value of the phase difference.
- the phase difference is the difference between the forward vibration position and the backward vibration position, and a magnification is set when the required time per one rotation of the main shaft is 1.
- FIG. 11 is a diagram illustrating an example of a machining program in which a phase difference is specified.
- the contents of FIG. 11 are basically the same as those shown in FIG. 7 of the first embodiment. However, it differs from that of FIG. 7 in that the phase difference is set by “W” in the command for starting the vibration cutting control mode of sequence number “N02”.
- the phase difference designated by “W” here, a magnification is set such that the required time per rotation of the main shaft is 1.
- FIG. 12A and 12B are diagrams showing a movement path with respect to time in the X-axis direction, where FIG. 12A is an enlarged view of a portion A in FIG. 8, and FIG. 12B is an enlarged view of a portion B in FIG. is there.
- the horizontal axis indicates the required time T per main shaft rotation
- the vertical axis indicates the X-axis position.
- the inclination of the vibration advance position R 1 and the vibration retreat position R 2 is equal to the feed amount F per rotation and is 0.05 mm. Further, the amplitude A is 0.10 mm by modifying the equation (1). Thus, the vibration amplitude feed ratio is 2.0. Further, as can be seen from this figure, the phase difference W is the difference t12-t11 between the time t12 when the vibration backward position R 2 becomes 0 and the time t11 when the vibration forward position R 1 becomes 0. And this phase difference W is 2T from Formula (4).
- the inclination of the vibration advance position R 1 and the vibration retreat position R 2 is equal to the feed amount (feed speed) F per rotation and is 0.10 mm.
- the amplitude A is 0.20 mm by modifying the equation (1).
- the vibration amplitude feed ratio is 2.0.
- the phase difference W is oscillating retracted position R 2 is 0 time t22 and the vibration forward position wherein R 1 is the difference t22-t21 and time t21 becomes 0. And this phase difference W is 2T from Formula (4).
- the vibration amplitude feed ratio Q is also constant. As a result, it can be seen that even if the phase difference W is specified instead of the vibration amplitude feed ratio Q, the same processing as in the first embodiment can be performed.
- the phase difference W is specified by the parameter 431 or the processing program 432 for processing. If the phase difference W is constant, the vibration amplitude feed ratio Q is also constant. In this case, the same effect as in the first embodiment can be obtained.
- the movement path on the machining program generally indicates the locus of the contour of the machining target after being machined by the command.
- the tool is cut with a tool.
- the trajectory of the reference position of the tool (for example, the center position of the tool) when moving the tool with respect to the object to be processed is the above movement path. Is different. This is because the reference position of the tool and the position of the cutting edge do not match. Therefore, the correction path may be generated by correcting so that the movement path on the machining program becomes the reference position of the tool, and vibration may be applied to the correction path. Examples of such correction include tool length correction, wear correction, nose R correction, other rotation direction correction, three-dimensional correction, and mechanical error correction.
- first and second embodiments described above can be applied to drilling.
- the numerical control device is suitable for numerical control of a machine tool using a machining program.
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Abstract
Description
図1は、実施の形態1による数値制御装置の構成の一例を示すブロック図である。数値制御装置1は、駆動部10と、入力操作部20と、表示部30と、制御演算部40と、を有する。
Q=A/F ・・・(1)
W=t1-t0 ・・・(2)
A/W=F/T ・・・(3)
W=AT/F=QT ・・・(4)
実施の形態1では、低周波振動を伴う切削加工の際に、振動振幅送り比率を一定にして加工を行っていた。実施の形態2では、振動振幅送り比率の代わりに位相差を一定にして加工を行う場合について説明する。
Claims (8)
- 工具または加工対象に設けられた駆動軸によって、前記工具と前記加工対象とを相対的に振動を伴いながら移動経路に沿って移動させて前記加工対象の加工を行う数値制御装置であって、
前記移動に際して指定される前記振動の振幅と前記加工対象に対する前記工具の送り速度の比率から、加工プログラム中の指令ブロックに基づいて生成される振動前進位置に対する振動後退位置の時間的な遅れを位相差として算出する位相差算出手段と、
前記位相差に基づき前記振動前進位置と前記振動後退位置とを前記移動経路として前記駆動軸ごとに生成する移動経路生成手段と、
前記移動経路に重畳させる基準振動波形に基づき前記移動経路における振動移動量を前記駆動軸ごとに算出する振動移動量生成手段と、
前記移動経路に前記振動移動量を加算した合成移動量を前記駆動軸ごとに生成する移動量合成手段と、
を備えることを特徴とする数値制御装置。 - 前記移動経路生成手段は、加工プログラム中の互いに異なる指令ブロックの移動経路を生成する場合に、前記比率を用いて各々前記移動経路を生成することを特徴とする請求項1に記載の数値制御装置。
- 前記送り速度を変化させる送り速度変更手段を備え、
前記移動経路生成手段は、前記送り速度変更手段で変更された前記送り速度と前記比率とを用いて前記移動経路を生成することを特徴とする請求項1に記載の数値制御装置。 - 前記比率は、前記加工対象を回転させる主軸が所定の回転位相になった時間での移動経路上での第1軸位置と、前記主軸が1回転以上回転した後に前記回転位相になった時間での移動経路上での第2軸位置と、を比較したときに、前記第1軸位置が進行方向に対して前記第2軸位置に比して移動始点に近い位置にある回転位相と、前記第2軸位置が進行方向に対して前記第1軸位置に比して前記移動始点に近い位置にある回転位相と、が存在するように設定されることを特徴とする請求項1から3のいずれか1つに記載の数値制御装置。
- 工具または加工対象に設けられた駆動軸によって、前記工具と前記加工対象とを相対的に振動を伴いながら移動経路に沿って移動させて前記加工対象の加工を行う数値制御装置であって、
加工プログラム中の指令ブロックに基づいて生成される振動前進位置と、前記移動に際して指定される位相差を前記振動前進位置に加算した振動後退位置とを前記移動経路として前記駆動軸ごとに生成する移動経路生成手段と、
前記移動経路に重畳させる基準振動波形に基づき前記移動経路における振動移動量を前記駆動軸ごとに算出する振動移動量生成手段と、
前記移動経路に前記振動移動量を加算した合成移動量を前記駆動軸ごとに生成する移動量合成手段と、
を備えることを特徴とする数値制御装置。 - 前記移動経路生成手段は、加工プログラム中の互いに異なる指令ブロックの移動経路を生成する場合に、前記位相差を用いて各々前記移動経路を生成することを特徴とする請求項5に記載の数値制御装置。
- 前記加工対象に対する前記工具の送り速度を変化させる送り速度変更手段を備え、
前記移動経路生成手段は、前記送り速度変更手段で変更された前記送り速度と前記位相差とを用いて前記移動経路を生成することを特徴とする請求項5に記載の数値制御装置。 - 前記位相差は、前記加工対象を回転させる主軸が所定の回転位相になった時間での移動経路上での第1軸位置と、前記主軸が1回転以上回転した後に前記回転位相になった時間での移動経路上での第2軸位置と、を比較したときに、前記第1軸位置が進行方向に対して前記第2軸位置に比して移動始点に近い位置にある回転位相と、前記第2軸位置が進行方向に対して前記第1軸位置に比して前記移動始点に近い位置にある回転位相と、が存在するように設定されることを特徴とする請求項5から7のいずれか1つに記載の数値制御装置。
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US20160266567A1 (en) | 2016-09-15 |
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JP5745710B1 (ja) | 2015-07-08 |
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