WO2012011173A1 - 材料試験機 - Google Patents
材料試験機 Download PDFInfo
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- WO2012011173A1 WO2012011173A1 PCT/JP2010/062313 JP2010062313W WO2012011173A1 WO 2012011173 A1 WO2012011173 A1 WO 2012011173A1 JP 2010062313 W JP2010062313 W JP 2010062313W WO 2012011173 A1 WO2012011173 A1 WO 2012011173A1
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- 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
- G01N2203/0058—Kind of property studied
- G01N2203/0092—Visco-elasticity, solidification, curing, cross-linking degree, vulcanisation or strength properties of semi-solid materials
- G01N2203/0094—Visco-elasticity
-
- 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
- G01N2203/0208—Specific programs of loading, e.g. incremental loading or pre-loading
-
- 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 a material testing machine, and more particularly to a material testing machine for testing a test piece having an elastic region and a plastic region.
- Such a material testing machine has, for example, a configuration in which a pair of screw rods are rotatably supported on a table in synchronization with each other, and both end portions of the crosshead are supported on these screw rods via nuts. Then, the crosshead is moved along the pair of screw rods by rotating the pair of screw rods in synchronization with each other by the rotation of the motor.
- a gripper is connected to each of the crosshead and the table. And it is comprised so that a load may be added with respect to a test piece by moving a crosshead in the state which hold
- a servo motor is usually used as a motor for rotating the screw rod.
- the physical quantity selected as the control amount among the test force acting on the test piece, the elongation of the test piece, etc. The detected value is fed back to the target value to control the motor. That is, for example, when the test force is selected as the control amount, a calculation such as PID is performed on the deviation between the detected value (current value) and the target value, and a value corresponding to the calculation result is applied to the driving motor.
- the motor is controlled by giving it as a rotational angular velocity command to the servo amplifier that supplies the drive signal.
- the value obtained by multiplying the deviation by a constant (proportional gain), the value obtained by multiplying the time derivative of the deviation by a constant (differential gain), or the value obtained by multiplying the time integral of the deviation by a constant (integral gain)
- the magnitude of the rotational angular velocity command is determined.
- a motor is used as a drive source of a load mechanism that applies a load to a test piece, and a rotational angular velocity command of the motor is momentarily given to a servo amplifier that drives the motor.
- a material testing machine having a control mechanism for controlling the operation of the load mechanism is disclosed.
- a test force acting on a test piece as a control amount and an elongation of the test piece as a control amount are detected as detection values.
- the magnitude of the rotational angular velocity supplied as a command to the servo amplifier is calculated according to the deviation between the detected value and the target value.
- the ratio of the detected value of the control amount to the displacement amount of the motor is sequentially calculated, and a value proportional to the value obtained by dividing the deviation by the calculated ratio is supplied as a command to the servo amplifier.
- the size is
- the setting of the control gain does not require skill, or trial and error work is performed, so that a long time is not required for setting. A material test can be performed.
- the rate of displacement between the gauge points is about 10% to 50%. That is, when a tensile force is applied to the test piece, deformation of the entire load mechanism such as the gripping tool holding the test piece and the crosshead for moving the gripping tool, Due to deformations other than between the points, the ratio of the displacement amount between the test marks in the test piece is smaller than the movement amount of the crosshead.
- test force tensile force
- the test force increases in proportion to the amount of movement of the crosshead, but in the plastic region, the test force does not vary greatly.
- the test force is highly dependent on the moving speed of the crosshead. If the moving speed of the crosshead is changed during the test, the test force varies due to the change in the test speed.
- the present invention has been made to solve the above problems, and provides a material testing machine capable of preventing the influence of noise and obtaining appropriate test results by reducing fluctuations in test force in the plastic region.
- the purpose is to do.
- the invention according to claim 1 is a material testing machine for testing a test piece having an elastic region and a plastic region, and a pair of grips for gripping both ends of the test piece, and the pair of grips.
- a moving member that moves one gripping tool among the tools, and a displacement meter that measures the amount of displacement of the distance between the gauge points in the test piece when the one gripping tool is moved by the moving member;
- a moving amount measuring means for measuring the moving amount of the moving member, and a rate of change R which is a ratio of the displacement amount of the distance measured by the displacement meter and the moving amount of the moving member measured by the moving amount measuring means is sequentially calculated.
- the feedback control unit when the rate of change R exceeds a set value, sets a value of a parameter K used for feedback control to a predetermined value.
- the feedback control is executed while being fixed to.
- the feedback control unit when the rate of change R exceeds a set value, sets the value of the parameter K used for feedback control at that time.
- the feedback control is executed with the value fixed between 1 and 1.
- the feedback control unit when the rate of change R exceeds a set value, sets a value of a parameter K used for feedback control at that time.
- the feedback control is executed with the value fixed.
- the feedback control unit determines the parameter K used for the feedback control.
- the feedback control is executed by performing arithmetic processing so that the variation rate of the value of K becomes a small value.
- the set value is 0.7.
- the moving mechanism that moves the moving member includes a motor that is used to move the moving member, and a servo amplifier that drives the motor.
- the movement amount measuring means measures the movement amount based on the displacement amount of the rotation angle of the motor.
- the invention according to an eighth aspect is the invention according to the seventh aspect, wherein the deviation between the target value of the distance displacement amount and the detected value of the distance displacement amount is set in advance to a value obtained by dividing the parameter K by the parameter K. A value obtained by multiplying the reciprocal of the time constant is used as the rotation angle to be supplied to the servo amplifier.
- the feedback control is performed based on the sequentially calculated change rate R, an appropriate material test can always be performed. At this time, by reducing the fluctuation of the test force in the plastic region, it becomes possible to prevent the influence of noise and obtain an appropriate test result.
- the material testing machine using a motor as a drive source it is not necessary to set a gain for feedback control of the motor. Accurate material testing can always be performed without requiring a long time for setting by performing necessary or trial and error work.
- FIG. 6 is a graph showing a relationship between a displacement amount E (t) of a distance D between the gauge points 19 and a displacement amount ⁇ (t) of a rotation angle of the servo motor 31.
- FIG. 1 is a schematic diagram of a material testing machine according to the present invention.
- FIG. 2 is a schematic view of the test piece 10.
- This material testing machine is movable along a table 16, a pair of screw rods 11, 12 that are erected on the table 16 so as to be vertically oriented, and these screw rods 11, 12.
- a cross head 13 and a load mechanism 30 for applying a load to the test piece 10 by moving the cross head 13 are provided.
- the crosshead 13 is connected to the pair of screw rods 11 and 12 via nuts (not shown).
- Worm speed reducers 32 and 33 in the load mechanism 30 are connected to lower ends of the screw rods 11 and 12.
- the worm speed reducers 32 and 33 are connected to a servo motor 31 that is a drive source of the load mechanism 30, and the rotation of the servo motor 31 is transferred to the pair of screw rods 11 and 12 via the worm speed reducers 32 and 33. It is configured to be transmitted.
- the crosshead 13 moves up and down along these screw rods 11 and 12.
- the upper grip 21 for holding the upper end of the test piece 10 is attached to the cross head 13.
- the cross head 13 functions as a moving member according to the present invention.
- the table 16 is provided with a lower gripping tool 22 for gripping the lower end portion of the test piece 10.
- the test force tensile load
- the test force is applied to the test piece 10 by raising the cross head 13 in a state where both ends of the test piece 10 are held by the upper gripping tool 21 and the lower gripping tool 22.
- the test force acting on the test piece 10 is detected by the load cell 14, amplified by the load amplifier 41, digitized by the AD converter 43, and input to the arithmetic control unit 40. Further, the displacement amount of the distance D (see FIG. 2) between the gauge points 19 in the test piece 10 is measured by the displacement meter 15, amplified by the strain amplifier 42, digitized by the AD converter 44, and calculation controlled. Input to the unit 40.
- the arithmetic control unit 40 is configured by a computer, a sequencer, and peripheral devices thereof, and executes test data and displacement amount data from the load cell 14 and the displacement meter 15 to execute data processing.
- the servo motor 31 is driven to rotate by the current supplied from the servo amplifier 45.
- the servo amplifier 45 supplies a current corresponding to the magnitude of the rotational angular velocity command supplied from the arithmetic control unit 40 via the D / A converter 46 to the servo motor 31.
- the servo motor 31 is feedback controlled by the arithmetic control unit 40.
- the arithmetic control unit 40 also functions as a movement amount measuring unit that measures the movement amount of the crosshead 13 based on the displacement amount of the rotation angle of the servo motor 31.
- the calculation control unit 40 determines a parameter 48 necessary for executing feedback control based on the calculated change rate R and a calculation unit 48 for sequentially calculating a change rate R, which will be described later, and feedback control. And a feedback control unit 49 for executing.
- An operation unit 47 is connected to the arithmetic control unit 40, and various commands can be given by operating the operation unit 47, or a constant A corresponding to a time constant described later can be set.
- the displacement amount of the rotation angle of the servo motor 31 is ⁇ (t)
- the detected value of the displacement amount (elongation amount) of the distance D between the gauge points 19 on the test piece 10 (currently) (Value) is E (t)
- the displacement angle ⁇ (t ⁇ t0) of the rotation angle of the servo motor 31 at a time t ⁇ t0 a certain time before t and the displacement amount E (t ⁇ ) of the distance D between the gauge points The rate of change R (t) represented by the following formula (1) using t0) is calculated every moment.
- a value proportional to the value obtained by dividing the deviation is set as the magnitude of the rotational angular velocity d ⁇ / dt to be supplied to the servo amplifier 45 by the parameter K (t) obtained by Expression (3).
- the detected value of the displacement amount of the distance D between the current gauge points 19 as the control amount is E (t)
- the target value of the control amount at that time is Ed (t)
- the deviation is ⁇
- Ed (t) ⁇ E (t) ⁇ the rotational angular velocity d ⁇ / dt to be supplied to the servo amplifier 45 is expressed by the following equation (4).
- a in Formula (4) is a constant set in advance, and this corresponds to the reciprocal of the time constant (time constant of variation in deviation) in the invention according to claim 7.
- A is increased if it is desired to converge quickly, and A may be decreased if it can be delayed.
- the ratio of the rotational angular velocity command magnitude d ⁇ / dt of the momentary rotational angular velocity command supplied to the servo amplifier 45 for driving the load mechanism 30 to the servo motor 45 is the amount of displacement of the rotational angle of the servo motor 31. Is automatically determined in accordance with the ratio of the change in the detected value of the displacement amount of the distance D between the gauge points 19, and is controlled to be small when the ratio is large and large when the ratio is small. In other words, the proportional gain is small when the ratio is large, and the proportional gain is automatically set large when the ratio is small. This makes it possible to always perform an accurate material test without setting a gain by trial and error prior to the test.
- the relationship between the displacement amount of the distance D between the gauge points 19 as the control amount and the rotation angle of the servo motor 31 is instantaneously substantially proportional, and the plastic deformation of the test piece as the test proceeds.
- the assumption is that the proportionality constant will change. That is, assuming that the displacement amount of the servo motor 31 from the beginning of the test is ⁇ (t) and the detected value of the displacement amount of the distance D between the gauge points 19 selected as the control amount is E (t), Formula (5) is materialized.
- this equation (5) shows that the displacement amount E (t) of the distance D between the gauge points 19 as the control amount is proportional to the displacement amount ⁇ (t) of the rotation angle of the servo motor 31 and is temporally
- the change in Er (t) indicates that the two are not strictly proportional.
- other than the proportional term is expressed by Er (t).
- FIG. 3 is a graph showing the relationship between the displacement amount E (t) of the distance D between the gauge points 19 and the displacement amount ⁇ (t) of the rotation angle of the servo motor 31.
- the horizontal axis represents the displacement amount of the motor (rotation angle with the initial test being 0) ⁇
- the vertical axis represents the detected value of the displacement amount E of the distance D between the gauge points 19 as the control amount. It is.
- Expression (6) is obtained.
- K (t) changes with the progress of the test, the detected value of the displacement amount E (t) of the distance D between the gauge points 19 as the control amount and the displacement amount of the rotation angle of the servo motor 31 are detected.
- K (t) is calculated every moment using the calculated K (t) and the angular velocity command magnitude of the servo motor 31 to be supplied to the servo amplifier 45 using the calculated K (t) and the deviation at that time. It calculates by Formula (4).
- equation (11) is established.
- the rotational angular velocity d ⁇ / dt to be supplied to the servo amplifier 45 is controlled to satisfy the above formula (4). That is, if the value of the rate of change R shown in Equation (1) is calculated and K is calculated and changed from Equations (2) to (3), the rotational angular velocity d ⁇ / to be supplied to the servo amplifier 45 is changed. dt is changed, and the moving speed of the crosshead 13 is changed.
- the test force is highly dependent on the moving speed of the crosshead 13, and if the moving speed of the crosshead 13 is changed during the test, a change in the test force due to the change in the test speed is generated. .
- the calculation unit 48 in the calculation control unit 40 sequentially calculates the change rate R, and whether the change rate R exceeds a preset set value of 0.7. Whether or not is constantly monitored.
- the ratio of the displacement amount is about 10% to 50%.
- the ratio of the amount of displacement between the gauge points 19 in the test piece 10 to the amount of movement of the crosshead 13 is close to 1. Therefore, whether or not the test piece 10 currently being tested is an elastic region or a plastic region can be determined based on whether or not the value of the change rate R described above exceeds, for example, 0.7.
- the rate of change R exceeds 0.7, which is a set value
- the value of the parameter K used for feedback control is fixed to a predetermined value, and the feedback control is executed.
- the feedback control is executed by fixing the value of K at this time to a value between that value and 1.
- the feedback control is executed by fixing the value of K at this time to the value at that time.
- the rate of change of the value of the parameter K used for feedback control corresponding to the value of the rate of change R becomes a small value.
- the above-described feedback control is executed by performing an appropriate calculation process. More specifically, when the rate of change R exceeds 0.7, the calculation unit 48 in the calculation control unit 40 performs a calculation so that the variation rate of the value of K becomes small under a certain condition, The feedback control unit 49 performs feedback control using K in consideration of the calculated variation rate. Even in this case, it becomes possible to prevent the influence of noise associated with fluctuations in test force, and a smooth graph can be created when the test results are graphed.
- the set value described above is not limited to 0.7, and may be set as appropriate according to the relationship between the material testing machine and the test piece 10. For example, when the material testing machine is sufficiently large and has sufficient rigidity with respect to the test piece 10, the set value may be set to a value larger than 0.7 and close to 1, When the rigidity of the testing machine is small, a value smaller than 0.7 may be set as the set value. Further, for example, the ratio of the displacement amount between the gauge points 19 of the test piece 10 with respect to the movement amount of the cross head 13 in the elastic region may be measured in advance, and this set value may be set in accordance with the ratio.
Abstract
Description
RよりKを計算する方法として、
としてもよいが、
(但し、aは係数であり、0<a<1)
とすることもできる。
この時a= 1 とすると式(2)となり、a0に近づけるとKの変化が小さくなる。
すなわち、試験開始当初からのサーボモータ31の変位量をθ(t)とし、制御量として選択されている標点19間の距離Dの変位量の検出値をE(t)とすると、下記の式(5)が成立する。
ここで、式(5)の両辺を時間微分すると、式(6)となる。
11 ねじ棹
12 ねじ棹
13 クロスヘッド
14 ロードセル
15 変位計
16 テーブル
21 上つかみ具
22 下つかみ具
30 負荷機構
31 サーボモータ
32 ウォーム減速器
33 ウォーム減速器
40 演算制御部
41 ロードアンプ
42 ストレインアンプ
45 サーボアンプ
47 操作部
48 算出部
49 フィードバック制御部
Claims (8)
- 弾性域と塑性域とを有する試験片に対して試験を行う材料試験機であって、
前記試験片の両端を把持する一対のつかみ具と、
前記一対のつかみ具のうちの一方のつかみ具を移動させる移動部材と、
前記移動部材により前記一方のつかみ具を移動させたときの、前記試験片における標点間の距離の変位量を測定する変位計と、
前記移動部材の移動量を測定する移動量測定手段と、
前記変位計により測定した距離の変位量と前記移動量測定手段により測定した移動部材の移動量との比である変化率Rを逐次算出する算出手段と、
前記逐次算出された変化率Rに基づいて、前記移動部材の移動量をフィードバック制御するために使用するパラメータKを算出する手段と、
フィードバック制御部と、を備え、
前記フィードバック制御部は、前記変化率Rが設定値を超えたときに、フィードバック制御に使用するパラメータKの値を前記フィードバック制御による影響力が小さい値に変更してフィードバック制御を実行することを特徴とする材料試験機。 - 請求項1に記載の材料試験機において、
前記フィードバック制御部は、前記変化率Rが設定値を超えたときに、フィードバック制御に使用するパラメータKの値を所定の値に固定して前記フィードバック制御を実行する材料試験機。 - 請求項2に記載の材料試験機において、
前記フィードバック制御部は、前記変化率Rが設定値を超えたときに、フィードバック制御に使用するパラメータKの値を、そのときのRの値と1との間の値に固定して前記フィードバック制御を実行する材料試験機。 - 請求項2に記載の材料試験機において、
前記フィードバック制御部は、前記変化率Rが設定値を超えたときに、フィードバック制御に使用するパラメータKの値をそのときのRの値に固定して前記フィードバック制御を実行する材料試験機。 - 請求項1に記載の材料試験機において、
前記フィードバック制御部は、前記変化率Rが設定値を超えたときに、このフィードバック制御に使用するパラメータKの値に対して、このKの値の変動率が小さな値となるような演算処理を行って、前記フィードバック制御を実行する材料試験機。 - 請求項1乃至請求項5のいずれかに記載の材料試験機において、
前記設定値は0.7である材料試験機。 - 請求項6に記載の材料試験機において、
前記移動部材を移動させる移動機構は、前記移動部材を移動させるために使用されるモータと、このモータを駆動するサーボアンプとを備え、
前記移動量測定手段は、前記モータの回転角の変位量に基づいて移動量を測定する材料試験機。 - 請求項7に記載の材料試験機において、
前記距離の変位量の目標値と距離の変位量の検出値との偏差を、上記パラメータKで除した値に、予め設定されている時定数の逆数を乗じた値を、前記サーボアンプに対して供給すべき回転角度の大きさとする材料試験機。
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US13/639,166 US8863584B2 (en) | 2010-07-22 | 2010-07-22 | Material testing system |
JP2012525272A JP5435135B2 (ja) | 2010-07-22 | 2010-07-22 | 材料試験機 |
PCT/JP2010/062313 WO2012011173A1 (ja) | 2010-07-22 | 2010-07-22 | 材料試験機 |
CN201080068160.XA CN103003682B (zh) | 2010-07-22 | 2010-07-22 | 材料试验机 |
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PCT/JP2010/062313 WO2012011173A1 (ja) | 2010-07-22 | 2010-07-22 | 材料試験機 |
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JP (1) | JP5435135B2 (ja) |
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CN103003682B (zh) | 2015-04-15 |
JP5435135B2 (ja) | 2014-03-05 |
US20130055823A1 (en) | 2013-03-07 |
US8863584B2 (en) | 2014-10-21 |
CN103003682A (zh) | 2013-03-27 |
JPWO2012011173A1 (ja) | 2013-09-09 |
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