CN111752225B - Machine tool, information processing method, and storage medium - Google Patents
Machine tool, information processing method, and storage medium Download PDFInfo
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- CN111752225B CN111752225B CN202010104054.8A CN202010104054A CN111752225B CN 111752225 B CN111752225 B CN 111752225B CN 202010104054 A CN202010104054 A CN 202010104054A CN 111752225 B CN111752225 B CN 111752225B
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- 230000010365 information processing Effects 0.000 title claims abstract description 8
- 238000003672 processing method Methods 0.000 title claims abstract description 8
- 238000004364 calculation method Methods 0.000 claims abstract description 18
- 238000004590 computer program Methods 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 description 62
- 238000000034 method Methods 0.000 description 11
- 238000005259 measurement Methods 0.000 description 6
- 230000001133 acceleration Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005401 electroluminescence Methods 0.000 description 2
- 239000012636 effector Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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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
- G05B19/416—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 of velocity, acceleration or deceleration
-
- 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
- G05B2219/32—Operator till task planning
- G05B2219/32063—Adapt speed of tool as function of deviation from target rate of workpieces
Abstract
The invention provides a machine tool, an information processing method and a storage medium, which can restrain vibration of the ground provided with the machine tool. A machine tool that performs work by using a tool, wherein the machine tool has: a floor intensity calculating unit that calculates the intensity of the floor on which the machine tool is installed; and a display unit that displays the floor strength calculated by the floor strength calculation unit.
Description
Technical Field
The present invention relates to a machine tool that performs an operation by using a tool, an information processing method for the machine tool, and a storage medium.
Background
Japanese laid-open patent publication No. 2009-15448 discloses a control device that suppresses the natural vibration amplitude of a robot itself in order to suppress the occurrence of vibrations of an end effector or the like mounted on the robot or the like. There are such problems that: when a plurality of machine tools are installed on the same floor, vibration generated in one machine tool vibrates the floor, and this vibration affects other machine tools, thereby reducing the machining accuracy of the other machine tools. The degree of vibration of the ground depends on the strength of the ground, but the control device in patent document 1 does not take into consideration the strength of the ground.
Disclosure of Invention
The purpose of the present invention is to provide a machine tool, an information processing method, and a storage medium, which are capable of calculating the floor strength and reflecting the floor strength to the operation of the machine tool, thereby suppressing floor vibration.
The machine tool according to claim 1 works by using a tool, wherein the machine tool has: a floor intensity calculating unit that calculates the intensity of the floor on which the machine tool is installed; and a display unit for displaying the floor strength calculated by the floor strength calculation unit.
The floor intensity calculating unit of the machine tool calculates the intensity of the floor on which the machine tool is provided, and the display unit displays the floor intensity calculated by the floor intensity calculating unit to the user.
The machine tool according to claim 2 includes: an automatic tool changing device for a tool; and a speed adjusting unit for adjusting the operation speed of the automatic tool changer based on the calculation result of the ground strength calculating unit.
The speed adjusting unit adjusts the operation speed of the automatic tool changer based on the calculation result of the ground strength calculating unit. For example, when the ground strength is weak, the operation speed of the automatic tool changer is slowed down.
The machine tool according to claim 3 includes a selection receiving unit that receives a selection of whether or not to perform adjustment of the operation speed of the automatic tool changer based on the speed adjusting unit.
The selection receiving unit receives a selection from a user as to whether or not to adjust the operation speed of the automatic tool changer based on the speed adjusting unit.
The machine tool according to claim 4 includes a vibration measuring unit that measures vibration of the machine tool when the machine tool is operated at a specific portion, and the floor strength calculating unit calculates the floor strength based on the magnitude of the maximum vibration or the frequency corresponding to the maximum vibration in a predetermined frequency range in which the vibration is corresponding to the frequency.
The vibration measuring unit measures, for example, vibration of the machine tool in the Z axis when a specific part of the machine tool is operated, and the floor strength calculating unit calculates the floor strength based on the magnitude of the maximum vibration in a predetermined frequency range or the frequency corresponding to the maximum vibration when the vibration is expressed corresponding to the frequency.
The machine tool according to claim 5 includes a vibration measuring unit that measures vibration of the machine tool caused by vibration when the machine tool is operated at a specific portion, and the floor strength calculating unit calculates the floor strength based on the magnitude of the maximum vibration in a predetermined frequency range when the vibration is associated with the frequency and the frequency associated with the maximum vibration.
The vibration measuring unit measures, for example, vibration of the machine tool in the Z axis when a specific part of the machine tool is operated, and the floor strength calculating unit calculates the floor strength based on the magnitude of the maximum vibration in a predetermined frequency range and the frequency corresponding to the maximum vibration when the vibration is expressed corresponding to the frequency.
The vibration measuring unit of the machine tool according to claim 6 is provided on a head, a column, a work table for supporting a work, or a base for supporting the column and the work table, and a tool is attached to the head, and the head moves up and down on the column.
The vibration measuring section can be provided at the upper end of the head, the upper end of the column, or the like, on the upper end side of the machine tool, or at the work table, the base, or the like.
The vibration measuring unit of the machine tool according to claim 7 is provided at an upper end portion of the head or an upper end portion of the column.
By providing the vibration measuring section at the upper end side of the machine tool such as the upper end of the head or the upper end of the column, the measurement accuracy of the vibration measuring section can be improved.
In the machine tool according to claim 8, the speed adjusting unit reduces the operation speed of the automatic tool changer when the floor strength calculated by the floor strength calculating unit is smaller than the threshold value.
When the ground strength calculated by the ground strength calculating unit is smaller than a threshold value, that is, when the ground strength is weak, the speed adjusting unit reduces the operation speed of the automatic tool changer, thereby suppressing vibration to the ground.
The floor intensity calculating unit of the machine tool according to claim 9 calculates the floor intensity based on the ratio of the magnitude of the maximum vibration to the threshold value when the magnitude of the maximum vibration is smaller than the threshold value.
When the vibration of the machine tool in the Z axis is measured and the magnitude of the maximum vibration in the case where the vibration is expressed in correspondence with the frequency is smaller than the threshold value, the floor strength calculating unit calculates the floor strength based on the ratio of the magnitude of the maximum vibration to the threshold value.
The floor intensity calculating unit of the machine tool according to claim 10 calculates the floor intensity based on the ratio of the frequency corresponding to the maximum vibration to the threshold value when the frequency corresponding to the maximum vibration is lower than the threshold value.
When the frequency corresponding to the maximum vibration in the case where the vibration of the machine tool in the Z axis is measured and the frequency corresponding to the vibration is expressed as a frequency is lower than the threshold value, the floor strength calculating unit calculates the floor strength based on the ratio of the frequency corresponding to the maximum vibration to the threshold value.
In the information processing method according to claim 11, the following processing is performed by a machine tool: the intensity of the ground surface on which the machine tool is installed is calculated, and the calculated ground surface intensity is displayed on a display unit of the machine tool.
The storage medium of claim 12 stores a computer program for executing the following processing by a computer: the intensity of the ground surface on which the machine tool is installed is calculated, and the calculated ground surface intensity is displayed on a display unit of the machine tool.
The intensity of the ground surface on which the machine tool is installed is calculated, and the calculated intensity of the ground surface is displayed to the user by a display unit.
The present invention can calculate the floor strength, and can reflect the floor strength to the operation of the machine tool, and as a result, can suppress the vibration of the floor.
Drawings
Fig. 1 is a perspective view of a machine tool.
Fig. 2 is a side view of a machine tool.
Fig. 3 is a functional block diagram showing a configuration of a main part of the numerical control apparatus.
Fig. 4 is a functional block diagram showing the configuration of the main part of the control unit.
Fig. 5 is a flowchart illustrating a process of adjusting the operation speed of the tool changer.
Fig. 6 is an explanatory diagram showing an example of the vibration waveform measured by the vibration measuring unit.
Fig. 7 is a flowchart illustrating a process of adjusting the operation speed of the tool changer in the machine tool according to the other embodiment.
Fig. 8 is a flowchart illustrating a process of adjusting the operation speed of the tool changer in the machine tool according to the further embodiment.
Detailed Description
The machine tool, the best method, and the storage medium of the embodiments are described in detail based on the drawings.
Embodiment 1
In the following, the left-right direction of the machine tool 1 is the X-axis direction, the front-rear direction is the Y-axis direction, and the up-down direction is the Z-axis direction.
As shown in fig. 1 and 2, the machine tool 1 has a base 2, a column 5, a spindle head 7, a spindle 9, a control box 6, a work table 10, and a tool changer 20 (automatic tool changer). The base 2 is an iron base having a substantially rectangular parallelepiped shape. The upright 5 is fixed to the upper rear part of the base 2. The spindle head 7 is movable in the up-down direction by a Z-axis movement mechanism (not shown) provided on the front surface of the column 5. The spindle head 7 rotatably supports the spindle 9 inside thereof, so that the spindle 9 can rotate. The spindle 9 extends vertically, and has a fitting hole (not shown) in a lower end portion thereof, and the spindle 9 is rotated by a spindle motor 52. The spindle motor 52 is located at the upper portion of the spindle head 7. One end side of the shank 17 holds the tool 4, and the other end side of the shank 17 is fitted into a fitting hole (not shown) of the spindle 9.
The tool changer 20 has a disc-shaped magazine 21. One end of a pair of left and right frames 8 is fixed to the front surface side of the column 5, and the other end of the frames 8 holds a magazine 21. The tool magazine 21 has a plurality of holding arms 90 on the outer periphery, and the plurality of holding arms 90 are radially provided. The clamp arm 90 holds the shank 17 so that the shank 17 can be attached and detached. The tool changer 20 rotates the magazine 21 to position the predetermined tool in the tool changing position. The tool changer 20 exchanges the tool 4 (tool shank 17) mounted on the spindle 9 with the next tool (tool shank 17) in the tool changing position. The tool changing position is the position of the lowermost end of the magazine 21.
The control box 6 houses a numerical control device 30 (see fig. 3). The numerical control device 30 controls the operation of the machine tool 1. The work table 10 is provided above the base 2, and the work table 10 is moved in the X-axis direction and the Y-axis direction by an X-axis motor 53, a Y-axis motor 54, and an X-axis-Y-axis guide mechanism (not shown).
As shown in fig. 3, the numerical control device 30 includes a CPU31, a control unit 32, a storage unit 34, an input/output unit 33, a driving circuit 51A to a driving circuit 55A, and the like. The CPU31 controls the numerical control device 30. The storage unit 34 is configured by a ROM, a RAM, a nonvolatile memory device, and the like. The ROM stores programs and the like related to the operation of the machine tool 1. The program is for calculating the strength of the ground on which the machine tool 1 is installed, displaying the calculated ground strength, adjusting the operation speed of the tool changer 20, and accepting a selection as to whether or not to adjust the operation speed of the tool changer 20. The RAM is used to temporarily store various data during execution of various processes. The program may be provided by a portable storage medium such as a usb disk or a CD-ROM. The operation panel 24 has an input unit 25 and a display unit 28, and is connected to an input/output unit 33. The input unit 25 has a physical keyboard, a touch panel, and the like. The operator inputs tool information such as a numerical control program and a tool type, various parameters, and the like, by using the input unit 25. After the operator operates the input unit 25, the display unit 28 displays various input screens, operation screens, and the like. The numerical control program or the like inputted and registered by the operator through the input unit 25 is stored in the storage unit 34. The numerical control program is composed of a plurality of blocks including various control commands, and controls various operations including axis movement, tool changing, and the like of the machine tool 1 on a block basis. The display unit 28 is constituted by an LCD or an EL (electro luminescence) panel, etc., and displays an intensity value of the floor surface F, a warning to be displayed to an operator, etc., which will be described later.
The machine tool 1 has a vibration measuring unit 26. The vibration measuring unit 26 is a gyro sensor, an acceleration sensor, or the like. The vibration measuring unit 26 measures vibration of the machine tool 1 in the Z axis, which is caused when a specific portion of the machine tool 1 is operated. The specific portion refers to the spindle head 7, the tool magazine 21, the work table 10, and the like. The vibration measured by the vibration measuring unit 26 is a velocity, an acceleration, or the like. Next, an example using the displacement measured by the vibration measuring unit 26 will be described. Further, when the acceleration measured by the vibration measuring unit 26 is double integrated, the displacement is obtained. The vibration measuring unit 26 measures the vibration (displacement) of the machine tool 1 according to the frequency. The vibration measuring unit 26 is disposed at the upper end portion of the machine tool 1 such as the spindle head 7 and the column 5, and at the work table 10 and the base 2. Further, it is more preferable that the displacement of the machine tool 1 in the Z axis be measured more reliably at the upper end portion (indicated by o in fig. 2) of the machine tool 1 such as the spindle head 7 and the column 5.
As shown in fig. 4, the control unit 32 includes a ground strength calculating unit 321, a speed adjusting unit 322, a selection receiving unit 323, and the like. The floor intensity calculating unit 321 calculates the intensity of the floor F on which the machine tool 1 is provided. The floor intensity calculating unit 321 calculates the intensity of the floor F based on the vibration (displacement) of the machine tool 1 in the Z axis measured by the vibration measuring unit 26. The control unit 32 performs fourier transform on the displacement measured by the vibration measuring unit 26, and associates the displacement with the frequency. The ground strength calculating unit 321 calculates the strength of the ground F based on the magnitude of the maximum displacement (maximum vibration) in the predetermined frequency range or the frequency corresponding to the maximum displacement when the displacement measured by the vibration measuring unit 26 is corresponding to the frequency. The predetermined frequency range is, for example, 50Hz or less. The display unit 28 displays the intensity of the floor surface F calculated by the floor intensity calculating unit 321 to the user. The ground strength calculating unit 321 calculates the strength of the ground F based on the difference between the magnitude of the maximum displacement and the threshold value when the magnitude of the maximum displacement is smaller than the threshold value. The ground strength calculating unit 321 calculates the strength of the ground F based on the difference between the frequency corresponding to the maximum displacement and the threshold value when the frequency corresponding to the maximum displacement is lower than the threshold value. The threshold value for comparison with the magnitude of the maximum displacement and the frequency corresponding to the maximum displacement is stored in the storage unit 34.
The speed adjusting unit 322 adjusts the operation speed of the tool changer 20 based on the calculation result of the ground strength calculating unit 321. When the calculation result of the ground strength calculation unit 321 is lower than the threshold value, that is, when the strength of the ground F is weak, the speed adjustment unit 322 makes the operation speed of the tool changer 20 slower than the preset speed, thereby reducing the impact on the ground F. The speed adjusting unit 322 slows down the up-down movement speed of the spindle 9, the rotational speed of a magazine motor 55 described later, and the like at the time of tool changing. Without being limited thereto, the speed adjusting unit 322 may increase the operation speed of the tool changer 20 when the calculation result of the ground strength calculating unit 321 is higher than the threshold value.
When the display unit 28 displays the intensity of the floor surface F, the selection receiving unit 323 receives a selection of the following from the user via the input unit 25: whether or not to adjust the operation speed of the tool changer 20 by the speed adjusting unit 322. The display unit 28 displays a dialog box for prompting the user to make a selection. When the selection receiving unit 323 receives a selection to adjust the operation speed of the tool changer 20, the speed adjusting unit 322 adjusts the operation speed of the tool changer 20 based on the calculation result of the ground strength calculating unit 321. When the selection receiving unit 323 receives a selection that does not adjust the operation speed of the tool changer 20, the display unit 28 stops displaying the dialog box.
The drive circuit 51A is connected to the current detector 51C, Z, the shaft motor 51, and the encoder 51B. The drive circuit 52A is connected to the current detector 52C, the spindle motor 52, and the encoder 52B. The drive circuit 53A is connected to the current detector 53C, X, the shaft motor 53, and the encoder 53B. The drive circuit 54A is connected to the current detector 54C, Y, the shaft motor 54, and the encoder 54B. The drive circuit 55A is connected to the magazine motor 55 and the encoder 55B. The drive circuits 51A to 55A receive instructions from the CPU31 and output drive currents to the motors 51 to 55 corresponding to the respective drive circuits. The drive circuit 51A receives a feedback signal from the encoder 51B, the drive circuit 52A receives a feedback signal from the encoder 52B, the drive circuit 53A receives a feedback signal from the encoder 53B, the drive circuit 54A receives a feedback signal from the encoder 54B, and the drive circuit 55A receives a feedback signal from the encoder 55B to perform feedback control of the position and the speed. The feedback signal is a pulse signal. The current detector 51C detects the driving current outputted by the driving circuit 51A, the current detector 52C detects the driving current outputted by the driving circuit 52A, the current detector 53C detects the driving current outputted by the driving circuit 53A, and the current detector 54C detects the driving current outputted by the driving circuit 54A. The current detector 51C feeds back the detected drive current to the drive circuit 51A, the current detector 52C feeds back the detected drive current to the drive circuit 52A, the current detector 53C feeds back the detected drive current to the drive circuit 53A, and the current detector 54C feeds back the detected drive current to the drive circuit 54A. The drive circuit 51A performs current (torque) control based on the drive current fed back from the current detector 51C, the drive circuit 52A performs current (torque) control based on the drive current fed back from the current detector 52C, the drive circuit 53A performs current (torque) control based on the drive current fed back from the current detector 53C, and the drive circuit 54A performs current (torque) control based on the drive current fed back from the current detector 54C. In general, the drive current flowing to the motor and the load torque applied to the motor are substantially identical. Therefore, the current detectors 51C to 54C detect the driving currents of the motors 51 to 54, thereby detecting the load torques of the motors 51 to 54.
When the tool holder 17 (tool 4) is assembled to the spindle 9 during the operation of the tool changer 20, the spindle 9 is moved up and down, and the spindle 9 holds the other end of the tool holder 17. At this time, the machine tool 1 vibrates due to the operation of the tool holding mechanism (the drawbar and the mechanism for operating the drawbar) housed in the spindle head 7. The vibration of the machine tool 1 is transmitted to the floor surface F as an external force, and the floor surface F is vibrated. Sometimes, the vibration of the ground F may affect other machine tools on the ground F as external interference, preventing the other machine tools from working normally. The machine tool 1 of the present invention can solve the above-described problems by adjusting the speed of changing the tool by the tool changing device 20 in accordance with the strength of the floor surface F.
As shown in fig. 5, the CPU31 monitors the input unit 25, and determines whether or not an instruction to calculate the intensity of the floor surface F (hereinafter referred to as an intensity calculation instruction) is received from the user (step S101). The present invention is not limited to this, and for example, when a main switch (not shown) is turned on, the main switch may be recognized as an intensity calculation instruction.
When the CPU31 determines that the intensity calculation instruction is not received (NO in step S101), the above determination is repeated. When it is determined that the intensity calculation instruction is received (yes in step S101), the CPU31 instructs the drive circuit 51A to raise the spindle head 7. The drive circuit 51A drives the Z-axis motor 51 in accordance with the instruction of the CPU31, and the spindle head 7 is raised in the Z-axis direction at a predetermined speed (step S102).
The CPU31 monitors the position of the spindle head 7 based on the feedback signal from the encoder 51B, and determines whether the position of the spindle head 7 has reached the first position (step S103). The first position is a position lower than a second position described later, and is a position higher than a third position described later. That is, in the Z-axis direction, the second position is highest, the first position is next highest, the third position is lowest, and the first position is closer to the second position than the third position.
When determining that the position of the spindle head 7 has not reached the first position (no in step S103), the CPU31 returns the process to step S102, and the spindle head 7 continues to be raised at a predetermined speed. When determining that the position of the spindle head 7 has reached the first position (yes in step S103), the CPU31 instructs the drive circuit 51A to reduce the raising speed of the spindle head 7. The drive circuit 51A controls the drive current of the Z-axis motor 51 in accordance with the instruction of the CPU31, and the spindle head 7 is raised in the Z-axis direction at a low speed (step S104). The CPU31 monitors the position of the spindle head 7 based on the feedback signal from the encoder 51B, and determines whether the position of the spindle head 7 has reached the second position (step S105). When determining that the position of the spindle head 7 has not reached the second position (step S105: no), the CPU31 returns the process to step S104, and the spindle head 7 continues to rise at a lower speed than the highest speed stored in the storage unit 34 in advance. When determining that the position of the spindle head 7 has reached the second position (yes in step S105), the CPU31 instructs the drive circuit 51A to stop the spindle head 7. The drive circuit 51A controls the drive current of the Z-axis motor 51 in accordance with the instruction of the CPU31, and the spindle head 7 stops (step S106). The CPU31 instructs the drive circuit 51A to move down the spindle head 7 at a high speed. The drive circuit 51A controls the drive current of the Z-axis motor 51 in accordance with the instruction of the CPU31, and the spindle head 7 descends at a high speed (step S107). The CPU31 determines whether or not the position of the spindle head 7 reaches the third position based on the feedback signal from the encoder 51B (step S108). When determining that the position of the spindle head 7 has not reached the third position (step S108: NO), the CPU31 returns the process to step S107, and the spindle head 7 continues to descend at a high speed. When determining that the position of the spindle head 7 has reached the third position (yes in step S108), the CPU31 instructs the drive circuit 51A to stop the spindle head 7. The drive circuit 51A controls the drive current of the Z-axis motor 51 in accordance with the instruction of the CPU31, and the spindle head 7 stops (step S109). At this time, a predetermined force N is applied to the floor surface F based on the inertia (due to acceleration and deceleration) of the spindle head 7, and the machine tool 1 and the floor surface F vibrate, and the vibration measuring unit 26 measures the vibration waveform. The vibration waveform is represented by associating the displacement of the machine tool 1 due to the vibration with the frequency. The control unit 32 (ground strength calculating unit 321) obtains the vibration waveform from the vibration measuring unit 26 via the input/output unit 33 (step S110).
Fig. 6 is a diagram showing an example of the vibration waveform measured by the vibration measuring unit 26, and the graph of the solid line shows the vibration waveform measured by the vibration measuring unit 26 (hereinafter referred to as a measured vibration waveform). In fig. 6, the horizontal axis represents frequency, and the vertical axis represents displacement of the machine tool 1. The vertical axis in fig. 6 may also be acceleration or velocity. The ground strength calculating unit 321 determines the maximum displacement from the measured vibration waveform acquired by the vibration measuring unit 26 (step S111). The maximum displacement is a value indicating a maximum displacement in a frequency range within 50 Hz. In fig. 6, the maximum displacement has a value (magnitude) of L1 (see solid arrow), and the corresponding frequency is H1. The floor intensity calculating unit 321 reads out the threshold value from the storage unit 34 (step S112). Fig. 6 is a graph illustrating an example of the threshold value using a broken line. The floor intensity calculating unit 321 calculates the intensity of the floor F on which the machine tool 1 is installed, based on the threshold value and the measured vibration waveform (step S113). The ground strength calculating unit 321 compares the magnitude of the maximum displacement of the measured vibration waveform with the magnitude of the maximum displacement of the threshold (see the broken line arrow in fig. 6) in the frequency range of 50Hz or less, and calculates the strength of the ground F. The maximum displacement of the threshold value is L0, and the corresponding frequency is H0. The ground strength calculating unit 321 calculates the strength of the ground F based on the ratio (L1/L0) of the magnitude of the maximum displacement of the measured vibration waveform to the maximum displacement of the threshold value when the magnitude of the maximum displacement of the measured vibration waveform is smaller than the maximum displacement of the threshold value.
The display unit 28 displays the intensity of the floor surface F calculated by the floor intensity calculating unit 321 (step S114). The display unit 28 displays the value of "L1/L0", for example, in% form. Alternatively, the storage unit 34 stores a first threshold value and a second threshold value (the first threshold value > the second threshold value), and when L1/L0 is greater than the first threshold value, the floor is displayed as "harder, when L1/L0 is smaller than the first threshold value but greater than the second threshold value, the floor is displayed as" weaker, and when L1/L0 is smaller than the second threshold value, the floor is displayed as "weaker. The display section 28 displays "a harder ground" when the maximum displacement of the vibration waveform is measured with a magnitude greater than the threshold value. The present invention is not limited thereto, and the ground strength calculating unit 321 may calculate the strength of the ground F based on the difference (|l0-l1|) between the magnitude of the maximum displacement of the measured vibration waveform and the maximum displacement of the threshold value.
The CPU31 determines whether or not the intensity of the floor surface F calculated in step S113 is smaller than a predetermined threshold value (step S115). The predetermined threshold is, for example, the first threshold. When determining that the intensity of the floor surface F is smaller than the predetermined threshold (step S115: yes), the CPU31 instructs the speed adjustment unit 322 to adjust the speed. The speed adjusting unit 322 adjusts the up-down movement speed of the spindle 9, the rotation speed of the magazine motor 55, and the like in response to the instruction from the CPU31 at the time of changing the tool (step S116). When determining that the intensity of the floor surface F is not less than the predetermined threshold value (step S115: NO), the CPU31 ends the process.
The floor intensity calculating unit 321 has been described as comparing the maximum displacement of the measured vibration waveform with the maximum displacement of the threshold value to calculate the intensity of the floor F, but is not limited thereto. The ground strength calculating unit 321 may calculate the strength of the ground F by comparing the frequency corresponding to the maximum displacement of the measured vibration waveform with the frequency corresponding to the maximum displacement of the threshold value. When the frequency corresponding to the maximum displacement of the measured vibration waveform is lower than the frequency corresponding to the maximum displacement of the threshold value, the ground strength calculating unit 321 may calculate the strength of the ground F based on the difference (|h0-h1|) between the frequency corresponding to the maximum displacement of the measured vibration waveform and the frequency corresponding to the maximum displacement of the threshold value. The ground strength calculating unit 321 may calculate the strength of the ground F based on a ratio (H1/H0) between the frequency corresponding to the maximum displacement of the measured vibration waveform and the frequency corresponding to the maximum displacement of the threshold value.
The vibration measuring unit 26 measures the vibration waveform of the floor surface F when the spindle head 7 is lowered, but is not limited thereto. Instead of measuring the vibration waveform of the floor surface F when the spindle head 7 is lowered, the vibration measuring unit 26 may measure the vibration waveform of the floor surface F when the tool magazine 21 is rotated or the work table 10 is moved, and use the measurement result for calculating the intensity of the floor surface F. While the calculation of the intensity of the floor surface F using the vibration waveform measured by the vibration measuring unit 26 has been described, the present invention is not limited to this.
When a load (inertia) is applied to the Z-axis motor 51 from the outside, a speed change occurs. The speed change can be detected from the position feedback signal and the speed feedback signal. The drive circuit 51A controls the drive power so as to restore the detected speed change. Accordingly, since the numerical control device 30 controls the drive current in response to the load applied to the Z-axis motor 51 during the feedback control, the load applied to the Z-axis motor 51 can be calculated based on the drive current. That is, the ground strength may be measured based on the load applied to the Z-axis motor 51.
As described above, in the machine tool 1 according to embodiment 1, when the strength of the floor surface F is weak, the speed adjusting unit 322 reduces the vertical movement speed of the spindle 9, the rotation speed of the magazine motor 55, and the like at the time of changing the tool, thereby reducing the impact on the floor surface F. Therefore, the influence of the vibration of the floor surface F on other machine tools on the floor surface F can be suppressed in advance. Since the vibration waveform of the floor surface F is measured when the spindle head 7 is lowered, the tool magazine 21 is rotated, or the work table 10 is moved, the force N applied to the floor surface F is constant when the intensity of the floor surface F is measured, and a stable and highly reliable measurement result can be obtained.
Embodiment 2
Fig. 7 is a flowchart illustrating a process of adjusting the operation speed of the tool changer 20, and steps S201 to S214 are the same as steps S101 to S114 in fig. 5, and the description thereof is omitted.
After the display unit 28 displays the intensity of the floor surface F (step S214), the CPU31 determines whether or not the intensity of the floor surface F calculated in step S213 is smaller than a predetermined threshold value (step S215). When it is determined that the intensity of the floor surface F is smaller than the predetermined threshold value (step S215: yes), the CPU31 instructs the display unit 28 to select the recommended display. The display unit 28 displays a selection recommendation in accordance with the instruction from the CPU31 (step S216). The selection recommendation is such that: the user is prompted to select whether to adjust the operation speed of the tool changer 20 by the speed adjustment unit 322. The CPU31 monitors the selection receiving unit 323 or the input unit 25, and determines whether or not a selection of an option to adjust the operation speed of the tool changer 20 is received from the user (step S217). When it is determined that the selection of the option to be executed has not been received from the user (step S217: NO), that is, when the selection of the option not to be executed has been received from the user, the CPU31 ends the processing. When it is determined that the user has received the selection of the option to perform the adjustment of the operation speed of the tool changer 20 (yes in step S217), the CPU31 instructs the speed adjustment unit 322 to perform the speed adjustment. The speed adjusting unit 322 adjusts the speed in accordance with the instruction from the CPU31, and slows down the up-down movement speed of the spindle 9, the rotation speed of the magazine motor 55, and the like at the time of tool changing (step S218).
As described above, with the machine tool 1 according to embodiment 2, when the strength of the floor surface F is weak, the machine tool can reduce the impact on the floor surface F, and can suppress the influence of the vibration of the floor surface F on other machine tools on the floor surface F. When the machine tool 1 is used to measure the strength of the floor surface F, the force N applied to the floor surface F is made constant, and a stable and highly reliable measurement result can be obtained.
With the machine tool 1 according to embodiment 2, the operation speed of the tool changer 20 can be selectively adjusted according to the needs of the user.
Embodiment 3
Fig. 8 is a flowchart illustrating a process of adjusting the operation speed of the tool changer 20, and steps S301 to S310 are the same as steps S101 to S110 in fig. 5, and the description thereof is omitted.
The ground strength calculating unit 321 determines the maximum displacement from the measured vibration waveform acquired by the vibration measuring unit 26 (step S311), and determines the frequency corresponding to the determined maximum displacement (step S312). As shown in fig. 6, the value (magnitude) of the maximum displacement of the measured vibration waveform is L1, and the corresponding frequency is H1. The floor intensity calculating unit 321 reads out the threshold value from the storage unit 34 (step S313). In fig. 6, an example of the threshold is illustrated by a graph of a broken line, and the value (magnitude) of the maximum displacement of the threshold is L0, and the corresponding frequency is H0. The CPU31 determines whether or not the frequency H1 corresponding to the maximum displacement of the measured vibration waveform is smaller than the frequency H0 corresponding to the maximum displacement of the threshold (step S314). When determining that the frequency H1 corresponding to the maximum displacement of the measured vibration waveform is smaller than the frequency H0 corresponding to the maximum displacement of the threshold (yes in step S314), the CPU31 instructs the speed adjustment unit 322 to adjust the speed. The speed adjusting unit 322 adjusts the speed in accordance with the instruction from the CPU31, and slows down the up-down movement speed of the spindle 9, the rotation speed of the magazine motor 55, and the like at the time of tool changing (step S316). When determining that the frequency H1 corresponding to the maximum displacement of the measured vibration waveform is greater than the frequency H0 corresponding to the maximum displacement of the threshold (step S314: no), the CPU31 determines whether the magnitude L1 of the maximum displacement of the measured vibration waveform is smaller than the magnitude L0 of the maximum displacement of the threshold (step S315). When determining that the magnitude L1 of the maximum displacement of the measured vibration waveform is smaller than the magnitude L0 of the maximum displacement of the threshold (yes in step S315), the CPU31 instructs the speed adjustment unit 322 to adjust the speed, and the speed adjustment unit 322 adjusts the speed to slow down the up-down movement speed of the spindle 9, the rotational speed of the magazine motor 55, and the like at the time of tool change (step S316). The display unit 28 may display the intensity of the floor surface F calculated by the floor intensity calculating unit 321. The display of the intensity of the ground surface F by the display unit 28 has already been described, and the description thereof is omitted here. When determining that the magnitude L1 of the maximum displacement of the measurement vibration waveform is larger than the magnitude L0 of the maximum displacement of the threshold (step S315: no), the CPU31 ends the processing.
As described above, with the machine tool 1 according to embodiment 3, when the strength of the floor surface F is weak, the machine tool can reduce the impact on the floor surface F, and can suppress the influence of the vibration of the floor surface F on other machine tools on the floor surface F. When the machine tool 1 is used to measure the strength of the floor surface F, the force N applied to the floor surface F is made constant, and a stable and highly reliable measurement result can be obtained.
The machine tool 1 according to embodiment 3 determines whether or not to adjust the operation speed of the tool changer 20 based on the magnitude of the maximum displacement and the frequency corresponding to the maximum displacement. Therefore, as compared with the case where the judgment is made based on only one of the magnitude of the maximum displacement and the frequency corresponding to the maximum displacement, an accurate judgment can be realized.
The ground strength calculating unit 321, the speed adjusting unit 322, and the selection receiving unit 323 may be configured by hardware logic.
Claims (12)
1. A machine tool which performs work by using a tool, characterized in that,
the machine tool comprises:
a floor intensity calculating unit that calculates the intensity of the floor on which the machine tool is installed;
a display unit that displays the floor strength calculated by the floor strength calculation unit;
an automatic tool changing device for the tool; and
And a speed adjusting unit that adjusts the operation speed of the automatic tool changer based on the calculation result of the ground strength calculating unit.
2. The machine tool according to claim 1, wherein,
the machine tool includes a selection receiving unit that receives a selection of whether to perform adjustment of the operation speed of the automatic tool changer based on the speed adjusting unit.
3. The machine tool according to claim 1, wherein,
the machine tool has a vibration measuring section that measures vibration of the machine tool when a specific portion is operated,
the ground intensity calculating unit calculates the ground intensity based on the magnitude of the maximum vibration in a predetermined frequency range by associating the vibration with the frequency.
4. The machine tool according to claim 1, wherein,
the machine tool has a vibration measuring section that measures vibration of the machine tool when a specific portion is operated,
the ground strength calculating unit calculates the ground strength based on a frequency corresponding to a maximum vibration in a predetermined frequency range, while associating the vibration with the frequency.
5. The machine tool according to claim 1, wherein,
the machine tool has a vibration measuring section that measures vibration of the machine tool caused by vibration when operating at a specific portion,
the floor intensity calculating unit calculates the floor intensity based on the magnitude of the maximum vibration in the predetermined frequency range and the frequency corresponding to the maximum vibration, while associating the vibration with the frequency.
6. The machine tool according to any one of claims 3 to 5, wherein,
the vibration measuring part is arranged on the head, the upright post, a workpiece table for supporting a workpiece or a base for supporting the upright post and the workpiece table, the cutter is arranged on the head, and the head moves up and down on the upright post.
7. The machine tool according to claim 6, wherein,
the vibration measuring part is arranged at the upper end part of the head part or the upper end part of the upright post.
8. The machine tool according to claim 1 or 2, wherein,
when the ground strength calculated by the ground strength calculating unit is smaller than a threshold value, the speed adjusting unit reduces the operation speed of the automatic tool changer.
9. A machine tool according to claim 3 or 5, wherein,
when the magnitude of the maximum vibration is smaller than a threshold value, the floor strength calculation unit calculates the floor strength based on a ratio of the magnitude of the maximum vibration to the threshold value.
10. The machine tool according to claim 4 or 5, wherein,
when the frequency corresponding to the maximum vibration is lower than a threshold value, the ground strength calculation unit calculates the ground strength based on a ratio of the frequency corresponding to the maximum vibration to the threshold value.
11. An information processing method, characterized in that,
in this information processing method, the following processing is performed by a machine tool:
the intensity of the ground on which the machine tool is arranged is calculated,
the calculated floor strength is displayed on a display unit of the machine tool,
and adjusting the action speed of the automatic tool changer for the tool based on the calculated ground strength.
12. A storage medium, characterized in that,
the storage medium stores a computer program to be executed by a computer to perform:
the strength of the ground on which the machine tool is installed is calculated,
the calculated floor strength is displayed on a display unit of the machine tool,
and adjusting the action speed of the automatic tool changer for the tool based on the calculated ground strength.
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| JP2019064186A JP7167811B2 (en) | 2019-03-28 | 2019-03-28 | Machine tool, information processing method and computer program |
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| CN111752225A (en) | 2020-10-09 |
| JP2020163490A (en) | 2020-10-08 |
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