CN102175436B - Method for testing dynamic stiffness of machine tool spindle based on MEMS (micro electro mechanical systems) - Google Patents
Method for testing dynamic stiffness of machine tool spindle based on MEMS (micro electro mechanical systems) Download PDFInfo
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- CN102175436B CN102175436B CN201010624005A CN201010624005A CN102175436B CN 102175436 B CN102175436 B CN 102175436B CN 201010624005 A CN201010624005 A CN 201010624005A CN 201010624005 A CN201010624005 A CN 201010624005A CN 102175436 B CN102175436 B CN 102175436B
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Abstract
The invention provides a method for testing dynamic stiffness of a machine tool spindle based on MEMS (micro electro mechanical systems). The method comprises the following steps: firstly, arranging a force sensor and an acceleration transducer on a shaft shoulder of the machine tool spindle along the vertical direction; sticking a reflection belt on the machine tool spindle close to a grinding wheel; arranging a photoelectric sensor on the inner wall of a machine tool cabinet close to the position of the reflection belt; connecting the sensors with an industrial personal computer; and acquiring a normal displacement signal S(t) by utilizing the matrix laboratory (MATLAB) software to perform integration calculation on a signal a(t) for the acquired normal acceleration; acquiring a normal force F(Omega) and displacement S(Omega), by transforming the acquired normal force F(t) and the displacement S(t) into amplitude spectrums by performing the Fourier transform; calculating and acquiring a dynamic stiffness G(Omega) according to the normal force F(Omega) and the displacement S(Omega) by utilizing the following formula: G(Omega) is equal to F(Omega)/ S(Omega); and lastly, judging if the working condition of the machine tool is safe, by comparing the detected dynamic stiffness at different conditions. By using the method, the precision for testing dynamic stiffness is increased. The method provided by the invention has the advantages that the precision for testing dynamic stiffness is high and the testing cost is low.
Description
Technical field
The present invention relates to machine tool chief axis dynamic stiffness field tests, be specifically related to a kind of method of testing of the machine tool chief axis dynamic stiffness based on MEMS.
Background technology
MEMS is the abbreviation of microelectromechanical systems, is meant to integrate microsensor, actuator and signal Processing and control circuit, interface circuit, communicate by letter and the Micro Electro Mechanical System of power supply.Its target be through system microminiaturization, integrated explore have new principle, the element and the system of new function.
Main shaft is one of important component part of lathe; The quality of the dynamic property of main shaft directly affects crudy and the lathe throughput rate of lathe to workpiece; The main shaft dynamic stiffness of lathe is the main evaluation index of main shaft dynamic property; It has reflected the ability of lathe opposing external applied load, and is all influential for the crudy and the lathe life-span of workpiece.For present Machine Tool design and manufacturing, general viewpoint is will be through increasing the vibration influence that rigidity reduces lathe, therefore; The measurement of dynamic stiffness is very important, yet the research for Dynamic Stiffness of Machine Tools both at home and abroad also is in the starting stage; The often dependence experience of measurement of Dynamic Stiffness of Machine Tools is carried out; Do not have clear and definite dynamic stiffness criterion, exist the measuring accuracy of dynamic stiffness low, measure the high shortcoming of cost.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of method of testing of the machine tool chief axis dynamic stiffness based on MEMS, improved the measuring accuracy of dynamic stiffness, the measuring accuracy with dynamic stiffness is high, measures the low advantage of cost.
In order to achieve the above object, the technical scheme of the present invention's employing is:
A kind of method of testing of the machine tool chief axis dynamic stiffness based on MEMS may further comprise the steps:
The first step; Vertically installing force sensor 3 and acceleration transducer 4 on the shaft shoulder 5 of machine tool chief axis 1; On machine tool chief axis, paste reflective tape 2 near emery wheel 9 places; Near the position of reflective tape 2 photoelectric sensor 7 is installed at lathe rack 6 inwalls, force transducer 3, acceleration transducer 4 and photoelectric sensor 7 are linked to each other with industrial computer 8;
Second step; Through matrix experiment chamber (MATLAB) software the normal acceleration that collects is carried out integral and calculating through
to signal a (t), obtain normal direction displacement signal S (t);
The 3rd step; It is amplitude spectrum that the normal force F (t) that collects and normal direction displacement S (t) are carried out Fourier transform through
, obtains normal force F (ω) and displacement S (ω);
In the 4th step, calculate dynamic rate G (ω) through G (ω)=F (ω)/S (ω) according to normal force F (ω) and normal direction displacement S (ω);
In the 5th step,, can whether evaluate safely the operating mode of lathe through the dynamic stiffness that records under the more different operating modes.
Because the present invention has adopted force transducer 3, acceleration transducer 4 and photoelectric sensor 7, through original signal is gathered and analyzed, so improved the measuring accuracy of dynamic stiffness, has the measuring accuracy advantages of higher of dynamic stiffness.
Description of drawings
Accompanying drawing is the scheme of installation of force transducer of the present invention 2, acceleration transducer 3, photoelectric sensor 4.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail, present embodiment adopts grinding machine to test.
A kind of method of testing of the machine tool chief axis dynamic stiffness based on MEMS may further comprise the steps:
The first step; With reference to accompanying drawing; Vertically installing force sensor 3 and acceleration transducer 4 on the shaft shoulder 5 of machine tool chief axis 1, the normal force signal F (t) of synchronous acquisition machine tool chief axis and the normal acceleration signal a (t) of machine tool chief axis, on machine tool chief axis 1 near emery wheel 9 places subsides reflective tape 2; Photoelectric sensor 7 is installed in position near reflective tape 2 on lathe rack 6 inwalls; Photoelectric sensor 7 can be radiated at gather mirror on the reflective tape 2, thereby carry out tachometry, force transducer 3, acceleration transducer 4 and photoelectric sensor 7 are linked to each other with industrial computer 8 to signal;
Second step; Through matrix experiment chamber (MATLAB) software the normal acceleration that collects is carried out integral and calculating through
to signal a (t), obtain normal direction displacement signal S (t);
The 3rd step; It is amplitude spectrum that the normal force F (t) that collects and displacement S (t) are carried out Fourier transform through
, obtains normal force F (ω) and displacement S (ω);
In the 4th step, calculate dynamic rate G (ω)=F (ω)/S (ω) according to normal force F (ω) and normal direction displacement S (ω);
In the 5th step,, can whether evaluate safely the operating mode of lathe through the dynamic stiffness that records under the more different operating modes.
In the accompanying drawing: 1 is machine tool chief axis; 2 is reflecting piece; 3 is force transducer; 4 is acceleration transducer; 5 is the shaft shoulder; 6 is the lathe rack; 7 is photoelectric sensor; 8 is industrial computer; 9 is emery wheel.
Claims (1)
1. method of testing based on the machine tool chief axis dynamic stiffness of MEMS is characterized in that: may further comprise the steps:
The first step; Vertically installing force sensor (3) and acceleration transducer (4) on the shaft shoulder (5) of machine tool chief axis (1); On machine tool chief axis, locate to paste reflective tape (2) near emery wheel (9); Near the position of reflective tape (2) photoelectric sensor (7) is installed at lathe rack (6) inwall, force transducer (3), acceleration transducer (4) and photoelectric sensor (7) are linked to each other with industrial computer (8);
Second step; Through matrix experiment chamber software; Be that MATLAB carries out integral and calculating through
to signal a (t) to the normal acceleration that collects, obtain normal direction displacement signal S (t);
The 3rd step; It is amplitude spectrum that the normal force F (t) that collects and displacement S (t) are carried out Fourier transform through
, obtains normal force F (ω) and displacement S (ω);
In the 4th step, calculate dynamic stiffness G (ω) through G (ω)=F (ω)/S (ω) according to normal force F (ω) and normal direction displacement S (ω);
In the 5th step,, can whether evaluate safely the operating mode of lathe through the dynamic stiffness that records under the more different operating modes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010624005A CN102175436B (en) | 2010-12-31 | 2010-12-31 | Method for testing dynamic stiffness of machine tool spindle based on MEMS (micro electro mechanical systems) |
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|---|---|---|---|
| CN201010624005A CN102175436B (en) | 2010-12-31 | 2010-12-31 | Method for testing dynamic stiffness of machine tool spindle based on MEMS (micro electro mechanical systems) |
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| CN102175436A CN102175436A (en) | 2011-09-07 |
| CN102175436B true CN102175436B (en) | 2012-09-26 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103217308A (en) * | 2013-03-27 | 2013-07-24 | 清华大学 | Complete machine dynamic stiffness testing system for numerical control machine tool |
| CN103278320A (en) * | 2013-05-31 | 2013-09-04 | 清华大学 | Non-contact detecting system of running dynamic stiffness of machine tool spindle |
| CN106768748B (en) * | 2017-02-07 | 2023-06-16 | 河北工业大学 | Built-in machine tool spindle axial dynamic stiffness testing device and testing method |
| CN108764073B (en) * | 2018-05-14 | 2021-09-21 | 华南理工大学 | Acceleration noise filtering and integrating method combined with spectrum energy form fitting |
| CN110449990A (en) * | 2019-07-11 | 2019-11-15 | 科德数控股份有限公司 | A kind of open loop dynamic error measurement method of closed-loop lathe |
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| KR20090121001A (en) * | 2008-05-21 | 2009-11-25 | 창원대학교 산학협력단 | A rigidity measurement of the main spindle which uses magnetic force |
| CN101718658B (en) * | 2009-11-17 | 2011-11-09 | 重庆大学 | Device for testing dynamic stiffness and constant pressure of high-speed electric spindle |
| CN101701868B (en) * | 2009-11-17 | 2011-07-27 | 重庆大学 | High-speed electric main shaft dynamic rigidity test device |
| CN101804580A (en) * | 2010-03-29 | 2010-08-18 | 华中科技大学 | Method for assessing reliability of technology for large numerical control machine |
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