KR101638623B1 - System and method for machining simulation of workpiece - Google Patents
System and method for machining simulation of workpiece Download PDFInfo
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- KR101638623B1 KR101638623B1 KR1020160008827A KR20160008827A KR101638623B1 KR 101638623 B1 KR101638623 B1 KR 101638623B1 KR 1020160008827 A KR1020160008827 A KR 1020160008827A KR 20160008827 A KR20160008827 A KR 20160008827A KR 101638623 B1 KR101638623 B1 KR 101638623B1
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- tool
- cutting force
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- workpiece
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- 238000004088 simulation Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000003754 machining Methods 0.000 title claims description 54
- 238000013500 data storage Methods 0.000 claims abstract description 40
- 238000004364 calculation method Methods 0.000 claims description 30
- 238000000605 extraction Methods 0.000 claims description 5
- 238000013016 damping Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000003801 milling Methods 0.000 abstract description 12
- 238000010586 diagram Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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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
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/41885—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by modeling, simulation of the manufacturing system
-
- 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
- G05B19/414—Structure of the control system, e.g. common controller or multiprocessor systems, interface to servo, programmable interface controller
- G05B19/4145—Structure of the control system, e.g. common controller or multiprocessor systems, interface to servo, programmable interface controller characterised by using same processor to execute programmable controller and numerical controller function [CNC] and PC controlled NC [PCNC]
-
- 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
- G05B2219/32216—If machining not optimized, simulate new parameters and correct machining
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- General Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Human Computer Interaction (AREA)
- Numerical Control (AREA)
- Automatic Control Of Machine Tools (AREA)
Abstract
Description
The present invention relates to a machining simulation system for a workpiece and a method of using the same, which can predict a machining accuracy of a workpiece through a simulation by inputting a CNC program before machining a workpiece such as a metal mold using a CNC milling machine.
Generally, a virtual CNC milling machine can input the CNC program and predict the machining shape of the workpiece through simulation. Such a conventional virtual CNC milling machine reads coordinates from a CNC program and mathematically processes the Boolean operation to simulate the machining shape of the workpiece.
6 is a flowchart showing an example of verifying a machining shape through a conventional virtual CNC milling machine. A tool shape, a workpiece shape, and a cutting condition are input to the virtual CNC milling machine (S101). Then, in the CNC program, one block of G code, X, Y and Z coordinate values are inputted (S103). The virtual CNC milling machine then computes the volume of the entire CNC program block and erases the computed volume (S105). That is, as shown in Fig. 7, the volume V to be eliminated of the work W is calculated and the calculated volume V is erased. Then, the virtual CNC milling machine outputs the machining shape to the screen (S107). The operator can then determine whether the machining shape is suitable for the purpose. Then, it is determined whether the entire block of the CNC program is completed (S109). If the block of the entire CNC program is not finished, the above-described steps S103 to S107 are repeatedly performed.
Such a conventional virtual CNC milling machine has a problem that it is impossible to predict a machining failure of a workpiece caused by breakage, abrasion and vibration of the tool due to excessive cutting occurring in an actual machining phenomenon.
SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a CNC machining method, A simulation system of a workpiece that predicts the vibration applied to the tool and the wear and tear to reduce the machining defects caused by tool breakage, abrasion and vibration caused by excessive cutting of the workpiece during actual machining, And a method using the same.
In order to achieve the object of the present invention as described above, the present invention provides a machining method for machining a workpiece, a shape of a workpiece, a cutting condition, a code of each block in a CNC program, A control unit for calculating a cutting force using the data of the input unit, a control unit for storing data input through the input unit and stored in the CNC program, A basic data storage unit in which the feed speed and the spindle speed are optimized and stored, and an output unit that outputs a machining simulation shape of the workpiece by using the cutting force calculated by the control unit,
Wherein the controller calculates a chip volume per blade in each block of the CNC program and calculates a cutting force by eliminating the calculated chip volume per day.
The chip volume calculating unit calculating a chip volume per blade of the tool, a cutting force calculating unit calculating a cutting force of the tool using the value calculated by the chip volume calculating unit, a value calculated by the chip volume calculating unit, A wear amount calculating section for calculating a wear amount of the tool using the value calculated by the chip volume calculating section, and a wear amount calculating section for calculating a wear amount And an extracting unit for extracting the cutting force and extracting the highest vibration value among the values calculated by the vibration value calculating unit.
Further, the present invention is characterized by comprising steps of receiving a tool shape, a shape of a workpiece and a cutting condition, receiving a shape of the tool, a shape of a workpiece, and a cutting condition, The coordinate values of X, Y and Z of the tool, the feed rate of the tool, and the spindle rotational speed in the basic data storage unit, the code of the block, the X, Y and Z coordinate values of the tool, Calculating a cutting force of the tool after the step of reading the rotation speed of the spindle and the rotation speed of the spindle, calculating a cutting force of the tool, determining whether the tool impacts the workpiece or generates excessive cutting force , Determining whether the tool impacts the workpiece or generates excessive cutting forces, the tool colliding with the workpiece A step of outputting a warning message when a cutting force is generated, and a step of determining whether an excessive cutting force is applied to the workpiece or not when the tool does not collide with the workpiece or an excessive cutting force is not generated Determining whether or not one block of the CNC program is completed, determining that the block is completed to move to a position before the cutting force when the one block is not finished, and performing a block in the step of determining completion of the block Calculating the tool wear amount, extracting the maximum cutting force and the maximum vibration value, and calculating the tool wear amount, the machining shape output, the maximum cutting force, the maximum vibration magnitude , The amount of tool wear is output and stored in the data storage And then outputs the machining shape output, the maximum cutting force, the maximum vibration magnitude, and the tool wear amount, and stores the machining shape output, the maximum vibration magnitude, and the tool wear amount in the data storage unit. After completion of the CNC program, And returning to the step before receiving the G code, X, Y, Z coordinate value, feed rate, and spindle speed of one block in the CNC program when the execution is not completed,
The step of calculating the cutting force provides a method of machining a workpiece by calculating the chip volume per blade in a CNC program block to erase the volume of the virtual workpiece and calculating the cutting force.
However, the present embodiment of the present invention as described above can simulate the machining shape by removing the chip volume per blade in the same manner as the cutting state of the actual milling machine, accurately predict the cutting force of the tool, The cutting condition can be verified precisely and the CNC program can be optimized to improve the accuracy of the workpiece after machining.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing a machining simulation system of a workpiece for explaining an embodiment of the present invention. Fig.
2 is a flowchart showing a machining simulation method of a workpiece for explaining an embodiment of the present invention.
FIG. 3 is a view illustrating a cutting force per tool per day of a tool for explaining an embodiment of the present invention and outputting it to a display.
FIG. 4 is a diagram showing a verification result of a verification CAD model and a virtual CNC program for explaining an embodiment of the present invention.
FIG. 5 is a view illustrating a cutting force per day calculated and output to a display in order to explain an embodiment of the present invention.
6 is a flowchart illustrating a method of predicting a machining shape using a conventional virtual CNC milling machine.
Fig. 7 is a view showing contents of erasing the volume of a workpiece according to the prior art. Fig.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.
In the embodiment of the present invention, a virtual tool is denoted by T and a virtual workpiece is denoted by W. [
FIG. 1 is a block diagram for explaining an embodiment of the present invention, and FIG. 2 is a flowchart for explaining an embodiment of the present invention, showing a machining simulation system for a workpiece and a method using the same.
The machining simulation system for a workpiece according to the embodiment of the present invention may include an
The
The
The
The
The chip
That is, the chip volume per tooth (S th )
Lt; / RTI >
Where S p is the volume removed during each sampling simulation time d t ,
ego, Is the cutting time per day,
Cutting time per day
Quot;Lt; / RTI >
Where S is the spindle revolution (rpm),
Is the number of teeth of the tool.The cutting force calculating unit 35 per blade can calculate the cutting force F th per cutting edge of the tool using the chip volume S th per blade. The cutting force F th per blade of the tool through the cutting force calculating unit 35 per blade can be expressed by the following equation.
The vibration
When modeling a cutting system by a tool with a vibration system, the vibration equation is as follows.
This vibration equation can be modeled as a multi-objective system. The displacement x (t) of the steady state of the forced vibration system by the predicted cutting force F t in the case of one degree of freedom is as follows.
Where X 0 is the amplitude of the vibration,
Is the phase, and the natural frequency and damping coefficient are as follows.
The amplitude X 0 is output as the vibration value.
The tool wear
That is, the tool wear amount W is
Can be calculated by the following equation.
The
The maximum cutting force can be extracted by comparing the cutting forces per tooth calculated by the cutting force calculating unit 35 per tooth. Also, the highest vibration value can be extracted by comparing the values calculated by the vibration
Since the maximum cutting force and the maximum vibration value actually affect the machining of the workpiece, it is possible to prevent the machining failure or to improve the machining accuracy by removing the problems expected in the actual machining of the workpiece in advance.
The machining simulation shape storage and
The
The
The basic
The cutting force
The vibration value
Likewise, the tool
The machining simulation method of the workpiece according to the embodiment of the present invention will now be described in detail with reference to FIGS. 1 and 2. FIG.
First, the user inputs the shape of the tool, the shape of the workpiece, and the cutting conditions and inputs the code of one block, the coordinate values of X, Y and Z of the tool, Speed, and spindle speed (S1). The data input through the
Then, the
Then, the
In an embodiment of the present invention, the cutting force per blade is preferably calculated using the chip volume per blade.
It is preferable that the cutting force per day calculated by the cutting force calculating unit 35 of the
In addition, it may be determined whether the tool collides with the workpiece due to the feed speed of the tool in the step S7 of determining whether the excessive cutting force is generated.
A warning message is output through the
Subsequently, when the tool does not collide with the virtual workpiece or does not generate excessive cutting force after the step (S7) of judging whether the tool collides with a virtual workpiece or an excessive cutting force is generated, Is completed (S11). If one block has not been completed in the step S11, the process moves to the step S5 of calculating the cutting force.
When the execution of one block is completed in the step S11 of determining the end of the block execution, the maximum cutting force and the maximum vibration value generated in the process are extracted and the amount of tool wear is calculated in step S13.
That is, the cutting force calculation unit 35 per day of the
Then, the machining shape output, the maximum cutting force, the maximum vibration magnitude, and the tool wear amount are output to the
After outputting the machining shape output, the maximum cutting force, the maximum vibration magnitude, and the tool wear amount and storing them in the data storage unit (S15), it is determined whether all the CNC programs have been executed. Is not completed, the CNC program is moved to a step before the step S3 in which the G code, X, Y, Z coordinate value, feed rate, and spindle speed of one block are inputted.
As described above, in the embodiment of the present invention, when calculating the cutting force, the chip volume per blade is calculated in a CNC program block, the chip volume of the virtual workpiece is erased, and the cutting force is calculated using the chip volume.
This embodiment of the present invention can simulate the machining shape by removing the chip volume per blade in the same manner as the cutting state of the actual milling machine, precisely predict the cutting force, and precisely verify the cutting condition before the work. Therefore, according to the present invention, it is possible to prevent a collision between a tool and an actual workpiece during machining by predicting a machining state before a machining operation of an actual workpiece, and to perform a precise machining operation.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And it goes without saying that the invention belongs to the scope of the invention.
1. Input,
3. The control unit,
5. Output,
7. Data storage,
31. A data loading unit,
33. Chip volumetric calculation unit per day,
35. Cutting force calculation unit per blade,
37. A vibration value calculating part,
39. Tool wear calculation part,
41. Maximum cutting force and maximum vibration value extraction unit,
43. Simulation of workpiece shape Shape storage and output,
71. Basic data storage,
73. Cutting force data storage section,
75. Vibration value data storage section,
77. Tool wear data storage section
Claims (10)
A control unit for calculating a cutting force using data of the input unit,
A basic data storage unit for storing data input through the input unit and input through the input unit or for optimally storing coordinate values, a feed rate, and a spindle speed in the CNC program,
And an output unit for outputting a machining simulation shape of the workpiece by using the cutting force calculated by the control unit,
The control unit
Calculating the chip volume per blade in each block of the CNC program to erase the computed chip volume per day and calculating the cutting force per blade using the chip volume per blade,
A chip volume calculating unit for calculating a chip volume per blade of the tool,
A cutting force calculation unit for calculating a cutting force of the tool using the value calculated by the chip volume calculation unit per blade,
A vibration value calculating unit for calculating a vibration value of the tool using the value calculated by the chip volume calculating unit per tooth,
A wear amount calculating unit for calculating a wear amount of the tool using the value calculated by the chip volume calculating unit per blade,
An extraction unit for extracting a maximum cutting force from the values calculated by the cutting force calculation unit for each blade and extracting a highest vibration value among the values calculated by the vibration value calculation unit,
And a machining simulation system for machining the workpiece.
In the calculation formula for calculating the chip volume per blade in the chip volume calculating unit per blade,
Lt; / RTI >
Where s p is the volume removed during each sampling simulation time d t , ego, Is the cutting time per day,
Cutting time per day Quot;
Lt; / RTI >
Where S is the spindle revolution (rpm), The number of tool teeth
A machining simulation system for a workpiece.
In the calculation formula for calculating the cutting force in the cutting force calculating section,
A machining simulation system for a workpiece.
Wherein the vibration value of the tool calculated by the vibration value calculating unit
And the displacement x (t) of the steady state of the forced vibration system by the predicted cutting force F t in case of one degree of freedom is modeled by the multi-
Lt;
Where X 0 is the amplitude of the vibration, Is the phase, and the natural frequency and damping coefficient are
And outputting an amplitude X 0 with the vibration value of the workpiece.
The calculation formula for calculating the amount of wear in the wear amount calculating unit is,
A machining simulation system for a workpiece.
After receiving the shape of the tool, the shape of the workpiece, and the cutting conditions, the code of one block, the coordinate values of X, Y and Z of the tool, the feed rate of the tool, and the spindle rotational speed are sequentially Loading in a basic data storage,
Calculating a cutting force of the tool after reading the code of the block, the X, Y, Z coordinate values of the tool, the feed rate of the tool, and the rotational speed of the spindle,
Determining whether the tool impacts the workpiece or generates excessive cutting forces after calculating the cutting force of the tool;
Outputting a warning message when the tool collides with the workpiece or generates an excessive cutting force in the step of determining whether the tool collides with the workpiece or an excessive cutting force is generated,
If it is determined that the tool does not collide with the workpiece or an excessive cutting force does not occur after the step of determining whether the tool impacts the workpiece or an excessive cutting force is generated, it is determined whether one block of the CNC program is finished, Determining the end of block execution to move to a point preceding the step of calculating the cutting force,
Calculating a tool wear amount by extracting a maximum cutting force and a maximum vibration value generated in the course of one block in the step of determining completion of the block execution,
A step of outputting the machining shape output, the maximum cutting force, the maximum vibration magnitude, and the tool wear amount after extracting the maximum cutting force and the maximum vibration value and calculating the tool wear amount,
After outputting the machining shape output, the maximum cutting force, the maximum vibration size, and the tool wear amount and storing them in the data storage unit, it is checked whether all of the CNC programs have been performed. A step of returning to the step of receiving a G code, X, Y, Z coordinate value, a feed speed, and a spindle speed of one block in the CNC program,
The step of calculating the cutting force
CNC program A method for machining a workpiece by calculating the chip volume per blade in one block, thereby eliminating the volume of the virtual workpiece and calculating the cutting force.
In the step of calculating the cutting force
The cutting force calculation formula in one CNC program block
, And the calculation formula of the chip volume per tooth (S th ) is
, Where s p is the volume removed during each sampling simulation time d t ego, Is the cutting time per day,
Cutting time per day Quot;
Lt; / RTI >
Where S is the spindle revolution (rpm), The number of tool teeth
Of the workpiece.
The vibration value of the tool
And the displacement x (t) of the steady state of the forced vibration system by the predicted cutting force F t in case of one degree of freedom is modeled by the multi-
Lt;
Where X 0 is the amplitude of the vibration, Is the phase, and the natural frequency and damping coefficient are
And outputting the amplitude X 0 by the vibration value of the workpiece.
The calculation formula of the wear amount of the tool is
Of the workpiece.
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Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107991995A (en) * | 2017-12-01 | 2018-05-04 | 长春设备工艺研究所 | Titanium alloy NC Milling Technology parameter optimization method based on engineer testing data model |
KR20180054354A (en) * | 2016-11-15 | 2018-05-24 | 주식회사 대영테크 | Adaptive Control Method For Vibration Of Machine Tool |
CN109446721A (en) * | 2018-11-16 | 2019-03-08 | 厦门大学 | Lathe technique interactive algorithm based on the arrangement of Identifier Software thread execution order |
KR20190043038A (en) * | 2017-10-17 | 2019-04-25 | 주식회사 대영테크 | Signal Processing Method For Adaptive Vibration Control Of Machine Tools |
KR20190125712A (en) | 2018-04-30 | 2019-11-07 | 충남대학교산학협력단 | Apparatus for simulating machine tool |
KR102053370B1 (en) * | 2018-06-01 | 2020-01-08 | (주)세원물산 | System and method for designing mold structure of high strength steel |
KR20200056635A (en) | 2018-11-15 | 2020-05-25 | 주식회사 대영테크 | Monitoring system for cutting system using intelligent cutting simulation and Monitoring method using thereof |
CN112462691A (en) * | 2020-11-25 | 2021-03-09 | 苏州谷夫道自动化科技有限公司 | OpenGL-based three-dimensional simulation method and system for multi-channel numerical control system |
CN114004539A (en) * | 2021-11-19 | 2022-02-01 | 四川启睿克科技有限公司 | Method for evaluating abrasion loss in each direction based on vibration data |
SE2351161A1 (en) * | 2022-10-09 | 2024-04-10 | Spm Instr Ab | A System for Tool Edge Monitoring |
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KR20180054354A (en) * | 2016-11-15 | 2018-05-24 | 주식회사 대영테크 | Adaptive Control Method For Vibration Of Machine Tool |
KR102073290B1 (en) * | 2017-10-17 | 2020-03-02 | 주식회사 대영테크 | Signal Processing Method For Adaptive Vibration Control Of Machine Tools |
KR20190043038A (en) * | 2017-10-17 | 2019-04-25 | 주식회사 대영테크 | Signal Processing Method For Adaptive Vibration Control Of Machine Tools |
CN107991995A (en) * | 2017-12-01 | 2018-05-04 | 长春设备工艺研究所 | Titanium alloy NC Milling Technology parameter optimization method based on engineer testing data model |
KR20190125712A (en) | 2018-04-30 | 2019-11-07 | 충남대학교산학협력단 | Apparatus for simulating machine tool |
KR102053370B1 (en) * | 2018-06-01 | 2020-01-08 | (주)세원물산 | System and method for designing mold structure of high strength steel |
KR20200056635A (en) | 2018-11-15 | 2020-05-25 | 주식회사 대영테크 | Monitoring system for cutting system using intelligent cutting simulation and Monitoring method using thereof |
KR102144420B1 (en) * | 2018-11-15 | 2020-08-12 | 백대균 | Monitoring system for cutting system using intelligent cutting simulation and Monitoring method using thereof |
CN109446721A (en) * | 2018-11-16 | 2019-03-08 | 厦门大学 | Lathe technique interactive algorithm based on the arrangement of Identifier Software thread execution order |
CN109446721B (en) * | 2018-11-16 | 2023-01-24 | 厦门大学 | Machine tool process interaction algorithm based on identifier software thread execution sequence arrangement |
CN112462691A (en) * | 2020-11-25 | 2021-03-09 | 苏州谷夫道自动化科技有限公司 | OpenGL-based three-dimensional simulation method and system for multi-channel numerical control system |
CN114004539A (en) * | 2021-11-19 | 2022-02-01 | 四川启睿克科技有限公司 | Method for evaluating abrasion loss in each direction based on vibration data |
CN114004539B (en) * | 2021-11-19 | 2024-05-14 | 四川启睿克科技有限公司 | Method for evaluating abrasion loss in all directions based on vibration data |
SE2351161A1 (en) * | 2022-10-09 | 2024-04-10 | Spm Instr Ab | A System for Tool Edge Monitoring |
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