JP3491105B2 - Numerically controlled machine tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention
When automatically generating a machining program based on
Refer to the specified cutting condition value table corresponding to the
Cutting conditions are automatically determined and set during the machining program.
Numerically controlled machine tool for performing machining. [0002] 2. Description of the Related Art The mass distribution of a rotor around a rotation axis is not sufficient.
Balanced parts do not balance as a whole during rotation and are unbalanced
The centrifugal force is transmitted to the machine frame via the shaft and the bearing. This power
Causes the machine to vibrate in the same cycle as the rotational speed,
Fatigue failure of parts and finishing surface refinement on machine tool spindles
It causes a decrease in degree. Conventionally, forces generated due to unbalance are
To keep the vibration within a certain limit, the quality of the rotor
Examine the mass distribution and, if necessary, readjust the mass distribution
You. This is generally referred to as balancing. Unbalanced
Measurements should be performed on parts (rotor
-), The balancing tester (balancing machine)
), While assembled on the machine frame
Parts (rotor), use a field balancer
Measure using [0004] This type of balance testing machine, field rose
Sensors are both devices that measure unbalance,
Modify parts and workpieces to compensate for unbalanced mass.
It does not have a mechanical mechanism to work. [0005] Therefore, conventionally, machining with a machine tool
At the end of the process, the completed parts are
Measure the unbalance and, based on the measurement results,
A machine was used to correct the unbalance. example
For example, the following correction processing steps (1) to (3)
Compensation for unbalance between finished parts and workpieces has been performed. (1) Once the machined work is taken out from the numerically controlled machine tool
Remove. And attached to the balance testing machine,
Measure the vibration of the machined workpiece and collect the analysis data.
You. (2) From the analysis data, the mass to be removed (hereinafter,
Positive mass), the phase of the position where the correction mass exists,
Calculates data such as distance from the data by a predetermined formula
I do. (3) The work is attached to the chuck again, and the calculated
Enter the correction data into the control unit of the numerically controlled machine
Correction processing for balance correction is performed. example
If the processing conditions for correcting the work unbalance mass
Set the cutting condition value corresponding to this machining condition.
It is automatically determined and this cutting condition value is
Set during programming. More specifically, it matches the corrected mass
Determine the hole with diameter and depth from the input data
The correction point on the workpiece
Empty by drilling based on the ram. Alternatively,
      End groove with arc and depth commensurate with positive mass
And cut it. In practice, a single corrective operation can correct unbalance
Often cannot. Therefore, the above (1), (2),
By repeating the process of (3), the unbalance is reduced to the allowable value range.
Repeat the correction processing to fit in the box. [0006] However, the above numerical control system
In machine tools, work to correct imbalance
Work processes such as removal, installation and correction
I had to return. Measurement and calculation of vibration
It took a lot of effort and time. Therefore, reduced productivity
Was also the cause. In addition, work installation and removal
Repeated removal makes it difficult to measure vibration accurately.
It is said that there is a large error in calculating the unbalanced mass.
There was also a problem. [0007] Because of the above, the work is unbalanced.
Correction processing of measurement and unbalance correction is used for main processing of workpieces
The number that can be subsequently performed as a series of continuous steps
Value-controlled machine tools have been sought for a long time. Accordingly, an object of the present invention is to measure the vibration from
The process from the main processing of the work to the correction processing
To provide a numerically controlled machine tool that can be executed as a subsequent process
And there. [0009] The gist of the present invention is as follows.
A machining program based on the set machining conditions.
When automatically generated, the specified cutting corresponding to the processing conditions
Cutting condition values are automatically determined by referring to the condition value table.
Numerical value that is set in the machining program to execute machining
In a control machine tool, mass imbalance occurs during spindle rotation
The vibration of the main shaft or the vibration between the main shaft and the main shaft
Vibration detection means for detecting the total vibration with the attached load
A rotation angle detecting means for detecting a rotation angle of the main shaft;
The vibration detected by the vibration detecting means and the rotation angle
Of the main shaft based on the rotation angle detected by the
Dynamic spectrum or total vibration spectrum of spindle and load
The vibration spectrum or the total vibration spectrum.
To the vibration frequency band corresponding to the spindle speed.
A particular spectrum, and extract the main axis from the particular spectrum.
Of the vibration amplitude and vibration phase of the
Vibration spectrum analyzer to detect vibration amplitude and vibration phase
And the vibration detected by the vibration spectrum analyzing means.
Based on the dynamic amplitude and vibration phase, the vibration vector
Or data representing the total vibration vector of the spindle and load.
Means for generating vibration vector data, and the vibration vector
Vibration vector of the spindle generated by the
Torque data and test weight of known mass as load
The total vibration of the spindle and the test weight when attached to the spindle
From the vector data, the vibration vector data of the test weight alone
Weight vibration vector calculating means for calculating the vibration,
Spindle vibration generated by vector data generation means
Workpiece data is taken as the main axis as motion vector data and load.
Vibration vector data of main spindle and workpiece when attached
To calculate the vibration vector data of the workpiece
Vibration vector computing means and the above-mentioned test weight vibration vector
Vibration vector of the test weight calculated by the
Data and the above work vibration vector calculation means
From the vibration vector data of the workpiece
Unbalance quality to calculate the unbalance mass in the network
The quantity calculating means and the calculated work unbalance mass
Judgment means for judging whether it is out of the specified allowable mass range
The work unbalance mass is the allowable mass
If an affirmative decision is made that the value is out of the range,
Work unbalance mass calculated by the mass calculation means
And the work vibration vector calculation means
Based on the vibration vector of the workpiece alone,
Machining condition setting to set machining conditions for correcting interference
Numerical control machine tool comprising:
It is in. [0010] The numerical control machine according to the present invention constructed as described above.
According to the machine, the vibration spectrum analyzing means uses the vibration detecting means.
The magnitude of the vibration detected by the step and the rotation angle detecting means
Vibration angle of the main shaft based on the rotation angle detected by
The total vibration spectrum of the vector or spindle and load
To analyze. Next, from the vibration spectrum, the spindle rotation speed
Extract a specific spectrum in the vibration frequency band corresponding to the
From the specific spectrum and the vibration amplitude and vibration of the main shaft.
Phase or total vibration amplitude and vibration of the spindle and load
Detect the dynamic phase. [0011] Based on the detected vibration amplitude and vibration phase,
Then, the vibration vector data generating means
Represents the total vibration vector between the vector and the main shaft and load
Generate data. Then, the trial weight vibration vector calculation
The means is a combination of the main shaft vibration vector data and the load.
And a test weight with a known mass attached to the spindle
From the total vibration vector data of the shaft and the test weight,
Calculate the vibration vector data of the weight alone. This comprehensive
The motion vector is the vibration vector of the spindle and the vibration of the test weight alone.
It is nothing but a composite vector with a motion vector. Therefore,
Specifically, the vibration vector of the main shaft is calculated from the total vibration vector.
Is subtracted to obtain the vibration vector (data
Is required. And the work vibration vector operator
The step is generated by the vibration vector data generating means.
In addition, the vibration vector data and the load
Vibration between the spindle and the workpiece when the tool is mounted on the spindle
From the vector data, the vibration vector data of the work alone
Is calculated. This total vibration vector data is
To the composite vector of the motion vector and the work vibration vector
Nothing else. Therefore, specifically, the total vibration vector
By subtracting the vibration vector of the spindle from
Is obtained. Subsequently, the unbalanced mass calculating means performs a trial
Vibration vector data of a single weight and vibration vector of a single workpiece
And the quality of unbalance in the work
Calculate the quantity. For example, as is well known, when the spindle speed is
At constant, the vibration amplitude is proportional to the magnitude of the unbalance.
In addition, the test weight has a known mass. Therefore, the work
Trial the magnitude of the vibration vector (effective line segment) of a single unit
Divided by the magnitude of the body vibration vector (effective line segment)
Multiplied by the test weight, the unbalanced mass of the work
Is required. [0013] Then, the judging means determines the calculated work.
The unbalanced mass is outside the specified allowable mass range
It is determined whether or not. Here, the work unbalance quality
If a positive determination is made that the amount is outside the allowable mass range,
The processing condition setting means determines whether the work unbalance mass
Based on single vibration vector data,
Set the processing conditions for correcting the balance. Then, in the numerically controlled machine tool, the setting
Automatically generates machining programs based on specified machining conditions
At the time of cutting, the specified cutting condition value table
The cutting conditions are automatically determined with reference to the
Set in the gram to compensate for unbalance.
Perform the work. [0015] Embodiments of the present invention will be described below with reference to the drawings.
You. First, FIG. 1 shows an automatic processing system to which the present invention is applied.
FIG. 2 is an explanatory view showing a schematic configuration, and FIG.
FIG. 3 is an explanatory view showing the arrangement of each part of the machine, and FIG.
Block diagram showing the main configuration of the main control unit in the machine, FIG.
1 is a block diagram illustrating a schematic configuration of a vibration measuring device. As shown in the figure, the automatic processing system 1
Looking broadly, the numerically controlled machine tool 3, the vibration measuring device 5,
And the numerically controlled machine tool 3
The machining section 10 and the main control section 30 are provided as main sections.
Have been. As shown in FIG. 1 and FIG.
The workpiece processing section 10 of the machine 3 includes a spindle 11 and a headstock 1.
2. Tool post 13 with mill shaft, turret 14, display device
There is an operation panel 16 provided with a device 15 and the like. On the main shaft 11
Is equipped with a chuck 20. Yes shown in figure
No, but on the axis of the main shaft 11, facing the main shaft 11
And another spindle is provided. The two headstocks
Both are coaxial and can move independently in the horizontal direction
It is provided in. One and two works with these two spindles
The machine is configured so that continuous machining is possible. blade
The stage 13 has a test weight used for vibration measurement, in addition to various tools.
Mounting equipment (not shown), brazing or soldering possible
A working injection device (not shown) is also provided. These tools
・ The instrument is used from the tool post 13 for vibration measurement and machining.
It is taken out and set in a predetermined mounting position. What
The functions of each part of the machine are the components of a numerically controlled machine tool.
Therefore, detailed description is omitted. The operation panel 16 adjusts the cutting feed speed.
Key to adjust the spindle peripheral speed
Overdrive key to be programmed
Command to rewrite the cutting feed rate or spindle peripheral speed setting
Command key (all not shown) for the work, unbalanced work
A command key or the like for commanding measurement of a match is connected.
The display device 15 displays data related to processing and work processes.
Is displayed. As shown in FIG. 3, the main control unit 30
Central information with information processing function configured as a logic operation circuit
A processing unit 31 is provided.
Main memory 33 with sufficient storage capacity, system control
System control program memory in which programs are stored
34, a machining program in which a program for machining is stored
RAM memory 35, in which a program for vibration measurement is stored
Measurement program memory 36, temporary storage and calculation of data
Work memory 37 serving as a work area for processing, outside
1st interface for input / output and processing of signals with external units
Interface 38 for input / output and processing of signals with external devices.
To the second interface 39. The system control program memory 34 includes:
System control for controlling the entire automatic processing system 1
The processing program is stored in the machining program memory 3.
5 shows the generation and execution of machining programs corresponding to various workpieces.
Processing for line control, data rewriting, processing condition setting,
Programs and word processing for various processes for setting cutting conditions
Various data such as cutting conditions and initial values for
The stored data reference table is stored. Externally connected to the first interface 38
What is different from the vibration measuring device 5 is the spindle control unit 4
0, control the X-axis / Z-axis servo motors SMx and SMz
-Axis servo unit 41 / Z-axis servo unit
42, a mill axis servo unit 4 for controlling the driving of the mill axis
3 and so on. Externally connected to the second interface 39
The equipment to be operated includes the operation panel 16, various sensors 44,
There are a pulse handle 45, a printer 46, and the like. The spindle control unit 40 is a motor driver
And directly controls the rotational drive of the spindle motor M
I do. The spindle motor M has a transducer (not shown)
It is provided and detects a rotation angle amount of the spindle motor M. X axis
Servo unit 41, Z axis servo unit 42, mill axis
Servo unit 43 also serves as a motor driver
Composed of servo motors SMx, SMz and mill shaft motors
(Not shown) are directly controlled. The automatic processing system 1 configured as described above
Then, at the time of startup, the main control unit 3 of the numerically controlled machine tool 3
0 is a list of machining conditions, patterns, and manuals of cutting condition values.
Display device for selection of automatic setting or automatic setting
15 is output. When manual setting is selected,
Outputs a list of condition items and details. Next, setup
The information screen is output to the display 15. For example, let's take a look at
Information screen, details of the shape and dimensions of the chuck and outer claws, etc.
An information screen showing details, an information screen showing details of the machining shape,
An information screen showing details of the tool is shown. like this
In a format that allows all information about machining to be easily checked
Is output. Also print from keyboard (not shown)
When a command is input, the setup information system has the same format as the display output.
Is output from the printer 46. The main control unit 30 stores the machining program memory 3
From 5, the machining program corresponding to the type of workpiece to be machined
Read and execute the system to control the machining operation.
Do. For example, based on the processing conditions input from the operation panel 16,
When automatically generating a machining program based on
In the machining program memory 35 corresponding to the machining conditions of the workpiece
Refer to the cutting condition value table of
Is automatically determined and set during the machining program.
You. In the machining program, for example, the spindle 11
Angle from the origin (so-called C-axis origin)
Executes machining processes such as milling by control.
The main control unit 30 also stores the machining program in a well-known EIA /
Compile into an execution control program using ISO code, etc.
I get irritated. Then, according to the generated execution control program,
Controlling the machine drive system of the numerically controlled machine tool 3
Execute processing. Note that these execution control programs
Since the contents are well known, details are omitted. As shown in FIG. 4, the vibration measuring device 5
Sensors 51 and 52, an input interface 55, and D
FT operation unit 56 and input / output interface 57
Vibration of the main shaft 11 when the main shaft rotates,
Vibration when test weight is applied, total of spindle 11 and workpiece
The combined vibration is measured and its vibration spectrum is analyzed. vibration
The measuring device 5 is provided from the main control unit 30 of the numerically controlled machine tool 3.
When a command signal is input, measurement is performed, and measurement and analysis data
(The amplitude of vibration μm and phase α) are output to the main control unit 30
I do. The vibration sensor 51 is a piezoelectric acceleration pickup.
The size of the vibration is measured as pressure and the
The signal S1 is output. The encoder 52 is an optical shaft
・ A rotary disk directly connected to the spindle 11, called an encoder
When the disk (not shown) rotates, the rotating disk slips.
(Not shown) to detect the light passing through
A periodic pulse signal S2 is output. The vibration sensor 51 uses a piezo element.
Semiconductor pressure sensor and non-contact eddy current displacement detection
Sensor. The encoder 52 is a magnetic encoder.
Or a numerical control machine tool 3 in advance.
Output by a provided transducer (not shown)
Electric signals may be used. In this case,
The number of components and signal lines of the device 5 can be reduced. The input interface 55 is a vibration sensor
The analog level signal S1 input from the
A that pulls and holds and converts it into digital data D1
/ D converter 55a and digital level data D1
A memory 55b for temporarily storing and storing
The input signal S2 from the decoder 52 is converted into a square wave synchronization signal D2.
A waveform shaping circuit 55c for shaping is provided as a main part.
You. The DFT operation unit 56 is a logical operation circuit
ROM, RAM, I / O port
(None shown) One-chip microcomputer
Unit, and a discrete Fourier transform (Descrete Fouri
er Transform). DFT operation unit
At 56, a discrete Fourier class is used for the level data D1.
Analyze vibration by performing numerical operations. In this embodiment, the input
Digital data D1 and synchronization signal D2
The vibration spectrum is calculated by the operation of discrete Fourier transform.
Is analyzed. From the analysis, the specific specification of the spindle speed component was
The vector is extracted and its vibration amplitude and phase are determined. The input / output interface 57 is a DFT
Of the vibration amplitude and phase obtained by the arithmetic unit 56
Control of the numerically controlled machine tool 3 using the total data as a signal
Output to the unit 30. In addition, a measurement command signal is
When a signal is input, the vibration
Command to take in signals from sensor 51 and encoder 52
I do. The unit of the vibration amplitude S is [μm] (micro
Ron), and the unit of the phase α is represented by [degree]. Ma
In addition, the above operation is a calculation method of a discrete Fourier operation.
Therefore, details are omitted. In this embodiment,
Performs the DFT operation unit 56 and the discrete Fourier operation.
To calculate the amplitude and phase of the vibration.
Fast Fourier Transform called FT (Fast Fourier Transform)
D) Calculation may be performed by performing an operation.
Central processing unit for Fourier operation (so-called DS
The Fourier transform may be executed at high speed using P). The automatic processing system configured as described above
1, the main control unit 30 of the numerically controlled machine tool 3
Before processing, first perform the reference vibration measurement process.
You. Hereinafter, the flow of FIG. 7 will be described with reference to FIGS. 5 and 6.
This processing will be described along the chart. When the process is started, first, at step 100
With no load and no test weight
A finger to enter the operation mode in which the spindle 11 rotates for a fixed time
Command to the spindle control unit 30 and the vibration
Sends a measurement command (hereinafter, referred to as a first measurement) to the vibration measurement device 5
Output. The state of the first measurement is schematically shown in the column (a) of FIG.
Shown in Subsequently, in step 110, the test weight D is
11 to the mill axis servo unit.
Output to the knit 43. By executing this process, the spindle
The test weight D having the mass Wt [g] is placed at the predetermined position Pt of No. 11.
Attached. The predetermined position Pt is, for example,
0 degrees of the axis of the axis of rotation, the so-called C axis origin, and the axis of the axis of rotation
At a predetermined distance r from the
The angular position in the axis coordinates is called a C-axis phase.) Note that
In the embodiment, the predetermined distance r is corrected from the center of the rotation axis described later.
It is set based on the distance to the normal processing point. Subsequently, in step 120, step 1
The same predetermined time and predetermined rotation speed as the first measurement performed in Step 10
Command to enter the operation mode for rotating the spindle 11 with
Output to the mill axis servo unit 43 and measure vibration
Measurement command (hereinafter, referred to as second measurement) to the vibration measuring device 5
To proceed to step 130. Column (b) of FIG.
2 schematically shows the state of measurement. In step 130, the vibration measuring device 5
The measurement result data (amplitude of vibration μm and phase α)
When input, create vector data from the input data
And a process for calculating the vibration vector of the test weight unit D.
Execute the process. Specifically, the amplitude and phase of the vibration
The input data at the time of the first and second measurements is
And Sb · αb, the vibration vector at the first measurement is V
a (Sa, αa), the vibration vector Vb (S
b, αb). Vibration vector Vb at the time of second measurement
From the vibration vector Va at the time of the first measurement
A vibration vector of the weight D alone is obtained. Therefore,
The vibration vector of the test weight D is denoted by Vt (St, αt).
Then, as is well known, Vb−Va = Vt (A) It is. Therefore, from equation (A), the vector operation
The vibration vector Vt of the test weight D
it can. This vector operation is shown in column (a) of FIG.
Thus, it is expanded as follows. | Vt | = (| Va |^Two+ | Vb |^Two-2 | Va | ・ | V
b ｜ cosθ₁)^1/2= ｛(Sa)^Two+ (Sb)^Two-2 (S
a) (Sb) cosθ₁｝^1/2= St θ₁ = Αa-αb θ_Two = Αb-αt = cos^-1(| Vb |^Two+ | Vt |^Two− |
Va |^Two) / 2 | Vb | · | Vt | = cos^-1｛(Sb)^Two
+ (Sa)^Two-(St)^Two/ 2Sb ・ St｝ αt = αb-θ_Two αt is at a position where the test weight D is 0 degrees in the C-axis phase.
In other words, it seems that the unbalanced mass of the work W is concentrated.
The phase (measurement phase) αw of the point to be formed is an angle in the C-axis phase.
It is expressed as (αw-αt). In this embodiment, the operation of the inverse trigonometric function is
Therefore, the angle of the vibration vector was obtained.
Create a table in advance, and_Two , αt
Good. In this case, the processing time required for the calculation is reduced.
As a result, this process is executed at a higher speed. Subsequently, in step 140, the obtained
Vectors Vt (St, αt), Va (Sa, αa), V
b (Sb, αb) as the default value
Stored in a predetermined area in the memory 37, and the processing is temporarily terminated.
I do. As a result of the above processing, the vibration of the test weight D alone
The vector Vt (St, αt) is obtained. This vibration
The vector Vt is fixed to the main shaft 11 again.
Measurement with mass (Wt [g] and phase αt)
The vibration vector. Therefore, as known in the literature
(For example, edited by Kenichi Kido, Manifold using FFT analyzer
Al] published by Japan Plant Maintenance Association, Japan Management Association
Meeting release), vibration caused by unbalance, (1) Frequency is equal to spindle speed (2) When the rotational speed is constant, the vibration amplitude is large
Proportional to the size (g-mm) (3) Position is related to vibration phase (unbalanced mass is almost
It is considered to be concentrated at one point) For this reason, the vibration vector V of the test weight D alone
t is a vibration vector caused by unbalance of the workpiece W.
This is a reference for calculation. The vibration vector of the workpiece W
Vx (Sx, αx), the unbalanced mass W
x is represented by the following equation. Wx = (Sx / St) × Wt (B) This Wt is called an influence coefficient. About trial weight D
In other words, the mass Wt and the position Pt are known (as described above).
As described above, the position Pt is the C-axis origin, and the C-axis phase
βt = 0). And, by the above processing,
The vibration vector Vt (St, αt) of the weight D alone is obtained.
Was. Therefore, the work vibration vector Vx (Sx,
If αx) is measured, the work is unbalanced from equation (B).
Can be determined. Next, the main control unit 30 executes the main processing of the work.
When finished, measure the workpiece vibration and correct the unbalance.
Run. Hereinafter, referring to FIG. 5 and FIG.
This processing will be described along a flowchart. When the process is started, first, at step 200
And the processed workpiece W is mounted on the chuck 20.
After confirming this, the process proceeds to step 210. Step 21
0 is the same as the first time and the second time for the predetermined time.
To enter the operation mode in which the main shaft 11 is rotated at the rotation speed.
Command to the spindle control unit 30 and vibration
Measurement (hereinafter, referred to as third measurement) to the vibration measurement device 5
Command. Then, the measurement result data is transmitted from the vibration measuring device 5.
Wait for input of vibration (amplitude of vibration μm and phase α)
To step 220. In column (c) of FIG.
The state of the measurement is schematically shown. In step 220, the third measurement data
Create the vector data and set the main
The magnitude of the unbalance of the shaft 11 and the unbalance of the work W
A process for calculating the reciprocating mass is executed. Specifically
Is the input data on the amplitude and phase of the vibration during the third measurement.
Is represented by Sc · αc, the vibration vector is Vc
(Sc, αc). No work, no test weight
Measurement of the vibration vector Va (Sa, αa)
The vibration vector V of the work alone
x (Sx, αx) is Vx = Vc-Va | Vx | = (| Vc |^Two+ | Va |^Two− | Vc | · | Va
｜ cosθ_Three)^1/2 θ_Three= Αc-αa θ_Four= Cos^-1{(| Va |^Two+ | Vx |^Two− | Vc |^Two) / 2 |
Va | ・ | Vx |}^1/2 αx = θ_Three+ Θ_Four+ Αa | Vx | = Sx was obtained, so from equation (B),
The unbalanced mass of the Wx = (Sx / St) × Wt Therefore, the measurement phase αt of the test weight D is already
Is determined by the reference vibration measurement process.
The C-axis phase βt of D is known. Workpiece vibration
Since the measurement phase αx of the vector Vx has been determined,
The C-axis phase βx at the unbalanced point is βx = (αx−αt) + βt Here, the mounting position of the test weight D is the C-axis origin.
And βt = 0. Therefore, the C axis position of the corrected machining point
The phase βx is represented by the following equation. βx = αx-αt Next, the routine proceeds to step 230, where
Correction processing from the cutting condition value table in the gram memory 35
Read data. Corrected machining data is stored in the machining program
According to the type of work, the data table provided in
It is set in advance. As modified processing data,
If the distance r from the rotation axis center to the corrected machining point
Correction processing contents (hole drilling,
Domilling, etc.), correction processing according to the specific gravity of the work material
Size (drilling hole diameter / depth, end mill
The length of the circular arc when machining)
There are tool types and tool diameters. Step 240
The workpiece machining accuracy that is predetermined for each type of workpiece
From the data table for unbalanced mass tolerance
Read box M. The maximum allowable value M of the unbalanced mass
Is the allowable vibration amplitude at the maximum rotation speed of the completed workpiece.
It is predetermined by the user. Subsequently, in step 250, step 22
The unbalanced mass Wx of the work obtained at 0 is calculated in Step 2
Exceeding the maximum allowable value M of the unbalance mass read out at 40
It is determined whether or not. In this judgment process,
Not exceeding the permissible value M, that is, below the maximum permissible value M
If a negative determination is made that there is, proceed to step 400.
No. On the other hand, there is no affirmative judgment that the maximum allowable value M has been exceeded.
If so, the process proceeds to step 260. In step 260, a process for correcting
It is determined whether a process is prepared. In this judgment process
No negative judgment is made that a correction process is not prepared.
If so, the process proceeds to step 400. Meanwhile, the correction process
If it is determined that the is prepared,
Proceed to 70. In step 270, the work unbalance
The mass Wx, the phase βmil of the corrected processing point, and the step 23
Based on the data read at 0, the X, Y, and C axes
Coordinate position on the configured 3D coordinates, modified processing data
Set. In step 280, the unbalance amount is set to a numerical value.
Data required for machining program of control machine tool 3
Execute processing for determining processing details in a format. Concrete
Specifically, the mass to be removed (hereinafter referred to as a corrected mass m)
, Angle and position data, and workpiece W material information
From the above, the processing mode (drilling, end milling, etc.)
), The diameter and depth of the drilled hole, the specified tool, etc.
Generates a data table. Note that the correction mass m is not
The amount of contact Wx is set as the maximum mass,
Limited by the range of the rated weight. Subsequently, at step 290, step 2
70 and the coordinates set in step 280.
To execute a predetermined machining program based on
The command is sent to the spindle control unit 40, the X-axis and Z-axis servos.
Output to units 41 and 42 and mill axis servo unit 43
I do. This process is used as processing control for numerically controlled machine tools.
Since it is knowledge and is not a main part of the present invention, the description is omitted.
I do. In step 300, the number of times of execution of the correction
It is determined whether the number is less than a predetermined limit number. This judgment
If the number of times of execution of correction processing is less than the limit
When a positive determination is made, the process returns to step 210.
You. That is, steps 210 to 290 are performed again.
Repeat the process. On the other hand, the number of times
If a negative determination is made that the value is above, step 4
Go to 00. On the other hand, from step 250,
From step 260 or from step 300, step 4
00, in this process, the unbalanced mass W
x and the phase are stored in a predetermined area of the work memory 37,
The process ends. It should be noted that the processing executed in step 280
There are several forms of detailed processing
is there. In this case, correction processing according to each form
Be sure to specify the details of Below, a specific example along FIG.
Will be described. (1) As shown in the column (a) of FIG.
The distance r to the correction processing point and the C-axis phase βmil
At the position determined by, one correction processing point (here, temporary
Is set as a reference point PCNT). (2) As shown in the column (b) of FIG.
When the mass Wx exceeds the predetermined amount Wd, the reference point PCNT
In addition, the correction processing points are set at a plurality of locations. For example,
A pitch h around a reference point on the circumference of the radius r
To set a plurality of correction processing points (P1, P2, ...)
You. At this time, first, at the reference point PCNT, a predetermined mass
Correction processing is performed for Wd. Next, the modified processing points (P1, P
2, ...) for the remaining corrected mass
And assign it to the corrected processing points (P1, P2, ...)
To set the drilling depth. However, correction processing point
Pn is within δ of the central angle from the reference point, and the total number is N
Set the following constraints according to the type of work.
Good. (3) As shown in column (c) of FIG.
Located on the bolt seat B (outside of the dowel pin)
Not set a modified processing point at the reference point PCNT.
No. Instead, clockwise around the reference point PCNT
And at a pitch i (or central angle ε) in a counterclockwise direction, 2
Correction processing points P1 and P2 are set at the locations. At this time
Divides the corrected mass m equally and divides it into the corrected machining points P1 and P2.
Set the drilling depth. In addition, additional fixes
If it is necessary to set the normal processing point (P3,
Clockwise outside of the normal processing point P1 and counterclockwise of P2
On the outside, at a smaller pitch j (or central angle ζ),
Set in two places. For the corrected mass m, the corrected machining point
Calculated in step 220 after machining at P1 and P2
Set the unbalanced mass Wx of the workpiece as
And distribute equally. (4) As shown in column (d) of FIG.
At this time, the arc length L (and the reference point PCNT)
Is unbalanced due to the center angle η) and depth d.
Correct the match. Work unbalance mass Wx
The length of the arc L is determined accordingly. Modifications after the second
In the above-mentioned conditions, the processing of the depth according to the correction mass m
Correction processing is performed by adding. As described above, in this embodiment, the automatic addition
In the machining system 1, the main control unit 10
Measurement of vibration and unbalanced mass and
Each process for calculating the contact point is executed. Then, the book
Each predetermined process for processing is executed. And work
Based on unbalanced mass and vibration vector of single workpiece
To set the processing conditions to correct the work imbalance.
Set. The cutting condition value table corresponding to this processing condition is
Determine cutting condition value by reference and set during machining program
And execute correction processing. For this reason, measurement of unbalance, work book
Automatically executes as a continuous process from machining to correction machining
Can be Therefore, labor is reduced and productivity is improved.
It works well above. Conventionally, attachment and detachment of a work
It is difficult to measure vibration accurately
Error in calculating the unbalanced mass
However, in this embodiment, the work
Vibration measurement and correction processing without mounting and removing
Is executed as a series of continuous processes,
It is effective in improving the accuracy of correction of the degree of unbalance. In addition
Conventionally, products made from deformed materials such as castings and fusing materials
Hole at a position that is not symmetrical about the rotation center of the rotating part
Unbalanced, such as finished parts that have been machined or notched
It took many steps and time to measure and correct
In this embodiment, the number of processes is reduced,
An integrated process from machining to repairing has been realized. Further, a correction for correcting imbalance is performed.
The form of machining is selected and executed according to the shape of the workpiece.
Therefore, the function of the completed work is not affected. In this embodiment, the work is unbalanced.
Was modified by drilling and end milling.
However, if the mass of the workpiece cannot be
Opposing position (C
Drilling and tapping at +180 degrees in axial coordinates)
And insert a metal screw with a large specific gravity into this hole.
Alternatively, fill the holes by brazing. Like this
To correct the imbalance. Alternatively, compensate for the corrected mass
The weight may be attached to the point opposite to the correction point.
No. In the above case, reducing the mass of the work
And can correct unbalance. [0057] As described in detail above, the numerical controller according to the present invention
According to the machine tool, the vibration spectrum analysis of the workpiece
Vibration vector of the weight alone and the vibration vector of the workpiece
Is calculated from these vibration vectors.
Calculate the contact mass. Furthermore, the work unbalance
Based on the mass and the vibration vector of the single workpiece,
The processing conditions to correct for
You. Then, based on the set processing conditions,
When automatically generating, the cutting condition value corresponding to the processing condition
The cutting condition value is automatically determined by referring to the table,
Perform machining by setting during the machining program. Souyu
In the numerically controlled machine tool of the present invention,
Work of the work, and correction of work unbalance
Process can be automatically executed as a continuous process.
it can.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing a schematic configuration of an automatic machining system according to an embodiment. FIG. 2 is an explanatory diagram showing a machine arrangement of a numerically controlled machine tool. FIG. 3 is a block diagram illustrating a main configuration of a main control unit. FIG. 4 is a block diagram illustrating a schematic configuration of a vibration measuring device. FIG. 5 is an explanatory diagram schematically showing vibration measurement. FIG. 6 is an explanatory diagram of calculation of a vibration vector. FIG. 7 is a flowchart of a reference vibration measurement process executed by a main control unit. FIG. 8 is a flowchart of a work vibration measurement process executed by a main control unit. FIG. 9 is an explanatory diagram of various modes of correction processing. [Description of Signs] 1 ... Automatic machining system 3 ... Numerical control machine tool 5 ... Vibration measuring device 30 ... Main control unit

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Shinichi Nakahira 1st small boarding, Oguchi-cho, Niwa-gun, Aichi Prefecture Inside the Yamazaki Mazak Co., Ltd. factory (72) Inventor Yoichi Mogi Oguchi-cho, Oguchi-cho, Niwa-gun, Aichi Prefecture Boarding No. 1 Yamazaki Mazak Co., Ltd. Factory (56) References JP-A-6-8106 (JP, A) JP-A-3-170251 (JP, A) JP-A-6-207882 (JP, A) (58) ) Surveyed fields (Int. Cl. ⁷ , DB name) B23Q 15/00-15/28 G05B 19/18-19/46 G05D 19/02

Claims (1)

(57) [Claims] [Claim 1] When a machining program is automatically generated based on a set machining condition, a cutting condition value is referred to a predetermined cutting condition value table corresponding to the machining condition. In a numerically controlled machine tool that automatically determines and sets during the machining program to execute machining, the vibration of the spindle or the load attached to the spindle and the spindle generated due to mass imbalance during spindle rotation. Vibration detecting means for detecting a total vibration of the main shaft, a rotation angle detecting means for detecting a rotation angle of the main shaft, and a main shaft based on the vibration detected by the vibration detecting means and the rotation angle detected by the rotation angle detecting means. Analyzing the vibration spectrum of the main shaft or the total vibration spectrum of the main shaft and the load, the vibration corresponding to the main shaft rotation speed from the vibration spectrum or the total vibration spectrum A vibration spectrum analyzing means for extracting a specific spectrum in a wave number band and detecting a vibration amplitude and a vibration phase of the main shaft or a total vibration amplitude and vibration phase of the main shaft and the load from the specific spectrum; Vibration vector data generating means for generating data representing a vibration vector of the main shaft or a total vibration vector of the main shaft and the load based on the obtained vibration amplitude and vibration phase; and a main shaft generated by the vibration vector data generating means. Test weight vibration vector calculating means for calculating the vibration vector data of the test weight alone from the vibration vector data and the total vibration vector data of the main shaft and the test weight when a test weight having a known mass is attached to the main shaft as a load. The main shaft vibration generated by the vibration vector data generating means Work vector calculation means for calculating the vibration vector data of the work alone from the total vibration vector data of the work spindle and the work when the work is mounted on the work spindle as a load, and the above-mentioned test weight vibration vector calculation means. An unbalanced mass calculating means for calculating an unbalanced mass of the work from the vibration vector data of the test weight alone and the vibration vector data of the work alone calculated by the work vibration vector calculating means; and the calculated work Determining means for determining whether or not the unbalanced mass is out of a predetermined allowable mass range; and when the determination means determines that the work unbalanced mass is out of the allowable mass range, the unbalanced mass is determined. The work unbalance mass calculated by the calculation means and the work vibration Based on the vibration vector of the workpiece itself, which is calculated by the torque calculating means, numerically controlled machine tool, characterized in that it includes a processing condition setting means for setting the processing conditions for correcting the imbalance of the workpiece, the.