WO2007148380A1 - 押込型材料試験機、試験方法、および試験用プログラム製品 - Google Patents
押込型材料試験機、試験方法、および試験用プログラム製品 Download PDFInfo
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- WO2007148380A1 WO2007148380A1 PCT/JP2006/312294 JP2006312294W WO2007148380A1 WO 2007148380 A1 WO2007148380 A1 WO 2007148380A1 JP 2006312294 W JP2006312294 W JP 2006312294W WO 2007148380 A1 WO2007148380 A1 WO 2007148380A1
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- WIPO (PCT)
- Prior art keywords
- detection signal
- indenter
- filter
- displacement detection
- displacement
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/0202—Control of the test
- G01N2203/021—Treatment of the signal; Calibration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
Definitions
- the present invention relates to an indentation-type material testing machine, a testing method, and a test program product that evaluate a material by pressing an indenter or the like against a sample with a minute load.
- Patent Document 1 discloses a micro hardness meter that presses an indenter against a sample and detects the displacement of the indenter with respect to the pressing load to measure the hardness of the sample.
- the pressure load on the sample of the indenter is very small, and the hardness tester itself may vibrate due to ambient noise and vibration, which may adversely affect the measurement results.
- Patent Document 2 discloses a testing machine that removes noise in a detection signal by inserting a preselected filter in a detection output extraction circuit for a test force or elongation acting on a test piece. ing. In this tester, noise is removed from the detection output by using the filter characteristics selected in advance.
- Patent Document 1 Japanese Patent Laid-Open No. 5-85019
- Patent Document 2 JP 2005-331256 A
- An indentation type material testing machine includes an indenter that is pushed into a sample, a load device that applies a load to the sample via the indenter, a displacement sensor that measures the displacement of the indenter, and an unloaded state. Displacement sensor force Based on the obtained displacement detection signal, a calculation device for calculating a filter characteristic for removing a disturbance component in the displacement detection signal, and a filter characteristic calculated by the calculation device A storage device that stores the filter; and a filter device that filters the displacement detection signal with the filter characteristics stored in the storage device.
- An indentation type material testing machine includes an indenter that is pushed into a sample, a load device that applies a load to the sample via the indenter, a displacement sensor that measures displacement of the indenter, and a load state Displacement sensor force based on the obtained displacement detection signal, a calculation device for calculating a filter characteristic for removing a disturbance component in the displacement detection signal, a storage device for storing the filter characteristic calculated by the calculation device, and a storage device And a filter device for filtering the displacement detection signal with the filter characteristics stored in.
- This indentation type material testing machine calculation device can also calculate the filter characteristics based on the displacement detection signal sampled at the beginning of indenter indentation.
- the filter device can perform filter processing in real time after the filter characteristics are calculated.
- the indenter indentation depth test force curve is calculated from the displacement sensor detection signal filtered by the filter device and the indenter pressing force by the load device.
- An arithmetic device for calculating the hardness can be further provided.
- the test method according to the present invention is such that the indenter is pressed against the sample, the displacement of the indenter is detected, the test force acting on the sample is detected by the indenter, and FFT analysis is performed on the detected displacement detection signal of the indenter, etc.
- To detect the noise frequency band calculate the filter characteristics based on the detected frequency band, filter the displacement detection signal based on the calculated filter characteristics, and calculate the displacement detection signal and test force after filtering. Based on the above, the physical properties of the sample are evaluated.
- the displacement detection signal used to detect the frequency band of noise can be a signal sampled in an unloaded state when the indenter contacts the sample.
- This test method is also used to detect noise frequency bands.
- the displacement detection signal used is a signal sampled in a load state where the indenter is pressing the sample.
- the test program product includes a process for pressing the indenter against the sample, a process for detecting the displacement of the indenter, a process for detecting the test force acting on the sample by the indenter, and the displacement of the detected indenter.
- a process for detecting a noise frequency band for the detection signal, a process for calculating a filter characteristic based on the detected frequency band, a process for filtering the displacement detection signal based on the calculated filter characteristic, and a post-filter process A computer executes processing for evaluating the physical properties of the sample based on the displacement detection signal and the test force.
- a material testing machine includes a measuring device that measures the frequency characteristics of disturbance noise superimposed on a detection signal, an arithmetic device that analyzes the frequency characteristics and determines a filter constant, and filters the detection signal.
- a filter device that performs a filter process defined by a constant and an evaluation device that evaluates a material using a detection signal that has been filtered by the filter device are provided.
- FIG. 1 is a diagram schematically showing the configuration of an indentation type material testing machine according to the present invention.
- Controller 21 CPU
- FIG. 1 shows an embodiment in which the indentation type material testing machine according to the present invention is applied to a micro hardness tester.
- the microhardness meter of this embodiment has a function for measuring the frequency characteristics of disturbance at the installation location, a function for determining the filter constant by analyzing the frequency characteristics of disturbance noise, and a filter constant for the displacement detection output. It has a function to suppress the influence of disturbance by applying the specified filtering process.
- the microhardness meter includes a frame 1, a sample stage 2 provided on the frame 1 so as to be movable up and down, and a stage 3 installed on the sample stage 2 and movable in XY directions orthogonal to each other.
- the sample TP held on the stage 3 is pressed by the indenter 4.
- the frame 1 includes a load device 5 that applies a test force to the sample TP via the indenter 4 and a displacement sensor 6 that measures the displacement of the indenter 4.
- the frame 1 is provided with a plurality of objective lenses 7 attached to a revolver, and the observation light incident on the objective lens 7 is observed at the eyepiece 10 by the imaging optical system 8 and the eyepiece optical system 9.
- An imaging device (not shown) is provided in the eyepiece 10, and an observation image from the imaging device is input to the control device 20 via the AZD transformation 11.
- the displacement sensor 6 is composed of, for example, a differential transformer type displacement detector.
- the analog output of the displacement sensor 6 is input to the AZD conversion from the amplifier 12, converted into a digital signal, and input to the control device 20.
- the load device 5 is composed of, for example, an electronic balance type variable load device.
- This load device 5 has an electromagnetic coil 51 to which the current adjusted by the load current supply device 14 is supplied, and the indenter 4 is pressed against the sample TP by the electromagnetic force of the electromagnetic coil 51.
- the pressing load is controlled by the supply current from the load current supply device 14.
- the control device 20 monitors the load current command value to the electromagnetic coil 51 and detects the pressing load by the indenter 4.
- the control device 20 includes a CPU 21, ROM 22, RAM 23, I / 024, touch panel monitor 25, recorder 26, etc., and the CPU 21 executes various processes described later by a test program stored in the ROM 22.
- the touch panel monitor 25 displays a test condition setting screen, a test data display screen, a test result display screen, and the like.
- the touch panel monitor 25 also displays various button switches to be described later.
- Recorder 26 is connected to IZ024 and measurement data is recorded.
- the CPU 21 determines the indentation depth detected by the displacement sensor 6 and the pressure on the sample TP by the indenter 4.
- the load (test force) is detected in association, and the hardness of the sample TP is obtained from the test car indentation depth curve.
- This process is a normal measurement process.
- the CPU 21 also executes a process for determining a filter constant. That is, the frequency characteristic due to the disturbance is analyzed based on the output signal of the displacement sensor 6, and the filter constant is calculated based on the analysis result. This process is called a filter constant calculation process. Then, the CPU 21 performs a filtering process defined by a filter constant on the displacement detection output from the displacement sensor 6 to remove a vibration component due to a disturbance.
- the filter constant is a parameter that determines the filter characteristics of the digital filter.
- the microhardness meter uses a filter characteristic pre-measurement method that calculates a filter constant using a displacement detection signal in an unloaded state prior to a test, and a displacement detection signal in a load state after the start of the test.
- the hardness measurement test can be performed with any of the post-measurement methods for filter characteristics to calculate the filter constant.
- the filter constant is calculated by measuring the frequency component of noise superimposed on the displacement detection signal measured in the no-load state prior to the test, and the displacement detection signal is filtered. Data is sampled while applying to remove noise. All data is sampled until the indenter 4 is pushed down to the specified indentation depth or until the indentation force reaches the specified value. Note that after sampling all of the displacement detection signals, the filter processing may be performed using a filter constant calculated in advance.
- a displacement detection signal is sampled while pushing an indenter into a sample, and a filter constant is calculated by analyzing a noise frequency superimposed on the displacement detection signal.
- the sampled displacement detection signal is subjected to filter processing defined by the filter constant to remove noise.
- the filter characteristic pre-measurement method and the filter characteristic post-measurement method are selected.
- the filter characteristic pre-measurement method button 25a and the filter characteristic post-measurement method button 25b are provided as the mode selection buttons shown in FIG.
- a filter constant calculation button 25c for determining the filter constant and a test start button 25d for sampling the hardness measurement data are also displayed.
- Figure 2 In the example, the filter characteristic pre-measurement method button 25a and the filter constant calculation button 25c are operated.
- Procedure 1 Control the load current supply device 14 to hold the indenter 4 at a predetermined position in the air.
- Step 2 Displacement detection signal of displacement sensor 6 is sampled for a predetermined time and stored in RAM23.
- Step 3 Read sampled displacement detection signal sequence from RAM23 and perform FFT analysis
- Step 4 Based on FFT analysis results, detect noise frequency characteristics and calculate filter constants to remove noise .
- This filter constant represents, for example, the pass frequency of the low-pass filter and the threshold value of the band-pass filter.
- Step 5 Store the filter constant in RAM23.
- the hardness of the sample TP is measured by the following procedures 11 to 15 using the determined filter constant.
- Step 11 Read the filter constant stored in RAM23 by operating test start button 25d.
- Step 12 Create an indentation by pressing the indenter 4 against the sample TP at a predetermined displacement speed.
- the displacement detection signal push-in depth
- the load current command value test force
- the read filter constant is applied to the displacement detection signal, and digital filtering is performed to remove noise.
- a test car indentation depth curve is created based on the displacement detection signal train and the load current command value after filtering.
- Step 13 Evaluate the hardness of the sample TP based on the test force-indentation depth curve. Next, a test procedure that employs the filter characteristic post-measurement method will be described.
- Step 21 Filter characteristic post-measurement method button 25b selects filter characteristic post-measurement method, and when test start button 25d is operated, indenter 4 is pressed against sample TP at a predetermined displacement speed to create an indentation. At this time, the displacement detection signal of the displacement sensor 6 is sampled, and the current command value indicating the test force is sampled at the same timing. The displacement detection signal (push-in depth) and the current command value (test force) are stored in the RAM 23 in association with each other.
- Step 22 When the specified indentation depth is detected or the specified indentation force is detected, the indenter 4 is finished being pushed in.
- Step 23 Read the displacement detection signal sequence of the displacement sensor 6 from the RAM 23, perform FFT analysis, detect the noise frequency band, and determine the filter constant.
- Step 24 The determined filter constant is stored in the RAM 23 of the control device 20.
- Step 25 Read the displacement detection signal and filter constant of displacement sensor 6 from RAM23, apply the digital filtering process to the displacement detection signal sequence with the read filter constant, and obtain the displacement detection signal from which the influence of disturbance has been removed. Store in RAM23.
- Step 26 Read out the displacement detection signal from which the disturbance has been removed and the test force corresponding to the displacement detection signal, and create a test car indentation depth curve.
- Step 27 Evaluate the hardness of the sample TP based on the test force-indentation depth curve.
- FIGS. 3 to 6 are flowcharts of a program for executing the above processes by the CPU 21.
- step S10 when the filter characteristic pre-measurement method button 25a is selected in step V, the filter characteristic pre-measurement method is selected.
- the process proceeds to the filter characteristic post measurement method processing in step S30.
- FIG. 4 is a flowchart of the filter characteristic prior measurement method process.
- the filter constant calculation button 25c is turned on in step S21, the process proceeds to step S22, and the load current supply device 14 is controlled to hold the indenter 4 at a predetermined position in the air.
- step S23 the displacement detection signal of the displacement sensor 6 is sampled and stored in the RAM 23 for a predetermined time.
- the sampled displacement detection signal train is also read out from the RAM23 and subjected to FFT analysis.
- the filter constant is calculated by detecting the frequency band of the noise included in the displacement detection signal sequence based on the FFT analysis result, and the filter constant is stored in the RAM 23 in step S26. In this way, after obtaining the filter constant in advance, the test process is executed in step S27.
- FIG. 5 is a flowchart of the test process.
- the filter constant stored in the RAM 23 is read in step S272.
- the indenter 4 is pressed against the sample TP at a predetermined displacement speed to create an indentation. While the indenter 4 is moving, step S273 to step S277 are repeated. That is, the displacement detection signal is read in step S274, the current command value is read in step S275, and the displacement detection signal and the current command value are stored in the RAM 23 in association with each other in step S276.
- step S277 when the indentation depth of the indenter 4 reaches a predetermined value or the indentation force reaches a predetermined value, the indenter 4 is stopped in step S278 and the process proceeds to step S279.
- step S279 digital filter processing is performed on the displacement detection signal sequence using the filter constant read in step S272. Thereby, the noise superimposed on the displacement detection signal is removed.
- step S280 a test car indentation depth curve is created based on the displacement detection signal after filtering and the current command value. The test force can be detected by the current command value to the load current supply device 14 as described above.
- step S281 the hardness of the sample TP is evaluated based on the test car indentation depth curve.
- step S41 When the test start button 25d is operated in step S41, the indenter 4 is pressed against the sample TP at a predetermined displacement speed in step S42 to create an indentation.
- the displacement detection signal from the displacement sensor 6 is sampled in step S43, and the load current command value representing the test force is sampled in step S44.
- step S45 the displacement detection signal is associated with the load current command value. And store it in RAM23.
- step S46 the predetermined indentation depth by the indenter 4 has reached the predetermined value, or the indentation force has not reached the predetermined value. If it is determined that it has been pushed, the pushing of the indenter 4 is terminated in step S47.
- step S48 the displacement detection signal string is read from the RAM 23 and subjected to FFT analysis.
- step S49 based on the FFT analysis result, a frequency band of noise included in the displacement detection signal sequence is detected to calculate a filter constant, and the filter constant is stored in the RAM 23.
- step S50 the displacement detection signal and filter constant of the displacement sensor 6 are read from the RAM 23, and digital filtering processing is performed on the displacement detection signal with the filter constant.
- step S51 a test car indentation depth curve is created based on the displacement detection signal after filtering and the current command value. The test force can be detected by the current command value to the load current supply device 14 as described above.
- step S52 the hardness of the sample TP is evaluated based on the test force-indentation depth curve.
- the filter constant that appropriately removes disturbance due to vibration at the installation location. It is preferable to calculate the filter constant each time using the post-measurement method for filter characteristics in environments where the installation location changes frequently and in environments where disturbances change from moment to moment. In an environment where the installation location is not changed frequently and the disturbance does not fluctuate, the filter constant pre-measurement method is selected and the filter constant is calculated prior to the test in order to shorten the test time. preferable.
- the present invention has an indentation-type material that has a small test force as a result of a physical property evaluation test of a thin film, and as a result, it is possible to evaluate a material under a test condition with an indentation depth force of ⁇ ⁇ m or less. Suitable for testing machines.
- the filter constant is determined by the displacement detection signal sequence sampled while pushing the indenter to a predetermined pushing depth. That is, after all the test data was sampled, FFT analysis was performed on the displacement detection signal train.
- the filter constant may be calculated by performing FFT analysis on the displacement detection signal sequence sampled at a predetermined time at the beginning of the pushing operation, and the subsequent sample data may be filtered in real time. It is also possible to detect the frequency component of noise by a method other than FFT analysis.
- the filter characteristic pre-measurement method and the filter characteristic post-measurement method One of the formulas was selected. However, it can also be used as an indentation type material testing machine equipped with only one of the methods!
- the filter processing for the displacement detection signal is digital processing in the CPU.
- an analog low-pass filter or a band-pass filter that removes noise components may be used.
- the filter characteristics must be variable according to commands from the CPU.
- the microhardness meter has been described above. However, the present invention is not limited to a test in which an indenter is pushed into a sample and the physical performance of the material is evaluated using at least a displacement detection signal. It is not limited to the microhardness meter described above. For example, the present invention can be applied to a testing machine that measures unloading curve force elastic modulus and the like.
- the present invention can add the above-described filter constant calculation function and programmable filter processing function to an existing material testing machine by rewriting a test program mounted on the existing material testing machine. That is, the test program product according to the present invention includes a process for pressing an indenter against a sample, a process for detecting displacement of the indenter, a process for detecting a test force acting on the sample by the indenter, and a displacement of the detected indenter.
- Processing that performs FFT analysis on the detection signal to detect the frequency band of noise, processing that calculates the filter characteristics based on the detected frequency band, and processing that filters the displacement detection signal based on the calculated filter characteristics And a process for evaluating the physical properties of the sample based on the displacement detection signal after the filter processing and the test force.
- the present invention further includes a measurement device that measures the frequency characteristics of disturbance noise superimposed on the detection signal, an arithmetic device that analyzes the frequency characteristics to determine a filter constant, and a filter constant for the detection signal. It can also be realized as a material testing machine that includes a filter device that performs the filtering process and an evaluation device that evaluates the material using the detection signal filtered by the filter device. Furthermore, the present invention is not limited to the above embodiment as long as the characteristics of the present invention are not impaired.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US12/305,280 US8156794B2 (en) | 2006-06-20 | 2006-06-20 | Indenting type material testing machine, testing method, and testing program product |
JP2008522196A JP4793445B2 (ja) | 2006-06-20 | 2006-06-20 | 押込型材料試験機、試験方法、および試験用プログラム製品 |
DE112006003935T DE112006003935B4 (de) | 2006-06-20 | 2006-06-20 | Materialprüfmaschine vom Eindringtyp, Prüfverfahren und Prüfprogrammprodukt |
PCT/JP2006/312294 WO2007148380A1 (ja) | 2006-06-20 | 2006-06-20 | 押込型材料試験機、試験方法、および試験用プログラム製品 |
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PCT/JP2006/312294 WO2007148380A1 (ja) | 2006-06-20 | 2006-06-20 | 押込型材料試験機、試験方法、および試験用プログラム製品 |
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WO2007148380A1 true WO2007148380A1 (ja) | 2007-12-27 |
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US (1) | US8156794B2 (ja) |
JP (1) | JP4793445B2 (ja) |
DE (1) | DE112006003935B4 (ja) |
WO (1) | WO2007148380A1 (ja) |
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JP2012093121A (ja) * | 2010-10-25 | 2012-05-17 | Mitsutoyo Corp | 硬さ試験方法及びプログラム |
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JP2020169838A (ja) * | 2019-04-01 | 2020-10-15 | 株式会社島津製作所 | 材料試験機、及び材料試験機の制御方法 |
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US9689825B1 (en) | 2013-09-09 | 2017-06-27 | Apple Inc. | Testing a layer positioned over a capacitive sensing device |
US9903781B2 (en) | 2014-03-28 | 2018-02-27 | United Technologies Corporation | Material testing apparatus and method |
US9622357B2 (en) | 2014-05-06 | 2017-04-11 | Apple Inc. | Method for orienting discrete parts |
US9739696B2 (en) * | 2015-08-31 | 2017-08-22 | Apple Inc. | Flexural testing apparatus for materials and method of testing materials |
JP6854183B2 (ja) * | 2017-04-28 | 2021-04-07 | 株式会社ミツトヨ | 硬さ試験機及びプログラム |
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CN103674744B (zh) * | 2013-12-16 | 2016-03-30 | 苏州美山子制衣有限公司 | 内衣棉杯手感测试仪 |
KR20200038883A (ko) * | 2017-08-10 | 2020-04-14 | 스미토모덴키고교가부시키가이샤 | 다결정 다이아몬드로 이루어진 압자, 그것을 이용한 균열 발생 하중의 평가 방법 및 그 평가 장치 |
KR102478351B1 (ko) * | 2017-08-10 | 2022-12-16 | 스미토모덴키고교가부시키가이샤 | 다결정 다이아몬드로 이루어진 압자, 그것을 이용한 균열 발생 하중의 평가 방법 및 그 평가 장치 |
JP2020169838A (ja) * | 2019-04-01 | 2020-10-15 | 株式会社島津製作所 | 材料試験機、及び材料試験機の制御方法 |
JP7180507B2 (ja) | 2019-04-01 | 2022-11-30 | 株式会社島津製作所 | 材料試験機、及び材料試験機の制御方法 |
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US8156794B2 (en) | 2012-04-17 |
JPWO2007148380A1 (ja) | 2009-11-12 |
DE112006003935B4 (de) | 2012-12-20 |
DE112006003935T5 (de) | 2009-07-09 |
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US20100229637A1 (en) | 2010-09-16 |
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