TW200925598A - Fatigue test device - Google Patents

Abstract

It is an object to provide a fatigue test device that enables a speed-amplitude constant sweep test in a wide frequency band including a high frequency region. The object has been attained by a fatigue test device comprised of a speed detection means that detects a deformation speed of works and a control means that, based on the detected result, controls a servo motor to set the ratio of the deformation speed to a predetermined speed in a predetermined range regardless of a period to repeatedly impose a load on the works whenever the period to impose the load changes. Further, it is an object to provide a fatigue test device that enables an acceleration amplitude constant sweep test in a wide frequency band including a high frequency region. The object has been attained by a fatigue test device comprised of an acceleration detection means that detects a deformation acceleration of works and a control means that, based on the detected result, controls a servo motor to set the ratio of the deformation acceleration to a predetermined acceleration in a predetermined range regardless of a period to repeatedly impose a load on the works whenever the period to impose the load changes.

Description

200925598 VI. Description of the Invention: [Technical Field of the Invention] • Examination Direction The present invention relates to a fatigue test apparatus for applying a torsional force, a tensile load, and a reverse load to a workpiece. [Prior Art] Applying a static load to a material or a reversal device is widely used to use the angle of two = Ο 四 (4);: ==: = by moving the phase of the wheel of the motor to its angle. In == there is a rotation for detecting the phase change of the axis. = The difference between the angles of the rotation axes judged by the detected value of the encoder generates the drive power given to the servo motor. The torque test device for performing the torque test is applied to the workpiece by amplifying the torque of the servo motor by a reduction gear (deceleration, wheel, etc.) provided between the tooth card and the rotary shaft of the servo motor. Further, the universal testing device for performing the pull-down, compression, and bending tests converts the rotational motion of the motor of the direct-transformation motor such as the feed screw mechanism on the rotary shaft of the servo motor into a linear motion. > In recent years, a servo motor with high reactivity has been put into practical use, and a high frequency has a positively subtracted, rectangular wave and a triangular wave waveform repeatedly applied to the workpiece. In such a test apparatus, a fatigue test can be performed to maintain the amplitude of the deformation speed of the workpiece (the speed in the torque test), and the speed amplitude of the frequency change is fixed to the frequency sweep test. The workpiece can perform a vibration of the fatigue peak (the angular acceleration in the torsion test), and the amplitude of the acceleration of the frequency change must be swept. 3 200925598 SUMMARY OF THE INVENTION In such a frequency sweep test, it is necessary to keep the amplitude of the deformation speed of the workpiece constant. Previously, the torque test device was based on the reduction ratio of the reducer. The universal test device was based on the conversion rate of the linear converter (the feed screw mechanism was the lead of the feed screw), and by controlling the angular velocity of the servo motor. The desired angular velocity and speed or the desired angular acceleration and acceleration cause the workpiece to receive a repetitive load. However, especially in the high frequency region, the elasticity and viscosity of the workpiece itself or the power transmission system (reducer and linear converter) are calculated according to the phase change amount of the rotating shaft of the servo motor and the characteristics of the power transmission system. The theoretical value of the angular velocity and velocity of the workpiece 'does not necessarily match the angular velocity and velocity of the actual workpiece. Further, the theoretical value of the angular acceleration and acceleration of the workpiece calculated based on the phase change amount of the rotary shaft of the servo motor and the characteristics of the power transmission system does not necessarily coincide with the angular acceleration and acceleration of the actual workpiece. Therefore, the prior fatigue test apparatus cannot perform a certain frequency sweep test in a wide frequency band including a high frequency region, or a certain frequency sweep test of the acceleration amplitude. The present invention has been made to solve the above problems. That is, the object of the present invention is to provide a fatigue test apparatus which can perform a certain frequency sweep test or an acceleration amplitude sweep test in a wide frequency including a high frequency region. In order to achieve the above object, the fatigue testing device of the present invention has: a f-degree detecting means for detecting a deformation speed of the workpiece; and a control hand' which controls the servo motor based on the detection result of the speed detecting means to apply a reverse load on the workpiece When the period changes, the ratio of the deformation speed of the money workpiece to the mosquito speed is within the specified range regardless of the period during which the reverse load is applied. 4 200925598 In addition, it is preferable to control the amplitude of the rotating shaft measured by the control means = in the ratio of the maximum value of the finger speed to the specified speed based on the speed detecting means. In addition, within the scope of the so-called motor, such as the system 95 or the so-called specified range, is between 0 99 〇 〇 Ο 5. In addition, a fatigue test device is attached to the workpiece. The torsion test device 'and the deformation speed of the workpiece is at the workpiece: the angular velocity around the axis of rotation of the workpiece. The specific position or the fatigue test of the tensile, compressive or bending load applied to the material A: the specific position of the workpiece is placed in the feed screw machine, and in order to achieve the above purpose, The fatigue of the invention has an acceleration detecting means for detecting the change of the workpiece, and the control means 'based on the acceleration detecting hand^" = * the period during which the reverse load is applied to the workpiece: two = ❹ Irrelevant, the ratio of the deformation acceleration of the workpiece to the specified acceleration is within the specified range. $External = and the ratio of the large value to the specified acceleration is measured in the specified period according to the acceleration detection means. The control means makes the servo horse violate the axis of rotation. The amplitude change is controlled. In addition, the so-called specified range is between 0.95 and 1.05. Or, within the specified range, it is between 0.99 and 1.01. In addition, if the fatigue test device is attached to the workpiece. Applying a torsion load to the two-force test device, and the deformation acceleration of the workpiece is the angular acceleration around the rotation axis of the workpiece at a specific position of the workpiece. Or, the fatigue test device is via the feed screw Mechanism, a universal test device that applies tensile, compressive or bending loads on the work, and the deformation acceleration of the work piece 200925598 is at a specific position of the workpiece in the feed direction component of the feed screw mechanism. According to the present invention, a fatigue test apparatus capable of performing a speed amplitude constant frequency sweep test or an acceleration amplitude constant frequency sweep test in a wide frequency band including a high frequency region is realized. [Embodiment] Hereinafter, with respect to an embodiment of the present invention, The first drawing shows the block diagram of the fatigue testing device according to the first embodiment of the present invention. The fatigue testing device of the present embodiment can repeatedly apply a torsional load on the test piece (workpiece). As shown in the first figure, the fatigue testing device 1 of the present embodiment has: a device body 10 for applying a torsional load on a workpiece W for driving a servo amplifier 20 of a servo motor 12 having a body 10 And controlling the control unit 30 of the servo amplifier 20. The apparatus body 10 has chucks 11a, lib, servo motor 12, reducer 13, and sense of torque The detector 14 and the angle sensor 15. The chucks 11a and 11b hold the workpiece W from both ends. The speed reducer 13 is disposed between the drive shaft of the servo motor 12 and one of the chucks 11a to increase the drive of the servo motor 12. The torque of the shaft is given to the workpiece W. Further, the other chuck lib is fixed to the frame of the apparatus body not shown in the figure via the torque sensor 14. In the configuration described above, when the servo motor 12 is driven, A torque load is applied to the workpiece W held by the chucks 11a and 11b, and the magnitude thereof is measured by the torque sensor 14. Further, the angle sensor 15 is provided on the output shaft of the speed reducer 13 to detect the workpiece near the chuck 11a. The torque angle of W. The servo motor 12 is controlled by the servo amplifier 20. That is, the servo 6 200925598 amplifier 20 is generated for driving the servo in accordance with the set angle transmitted from the control unit 3 (the rotation axis angle of the target servo motor). The driving power of the motor 12 is sent to the servo motor 12 to be driven. The servo motor 12 is provided with a rotary encoder 12a for detecting the number of revolutions, the angle, and the like of the rotary shaft of the servo motor 12. The signal output of the rotary encoder 12a is connected to the servo amplifier 20, and the servo amplifier 2 performs feedback control of the drive power in accordance with the measurement result of the rotary encoder 12a.

Next, the configuration of the control unit 30 will be described. The second drawing is a block diagram of the control unit 30 of the present embodiment. As shown in the second figure, the control unit 30 of the present embodiment has a controller 31, a signal conversion means %, an A/D conversion section 33, a torque sensor Ail 34a, an angle sensor amplifier 34b, and an operation means. 35. Waveform generating circuit 36, floppy disk drive (FDD) 37, memory 38 and analog 珲39. Further, in the first diagram and the first diagram, the control unit 30 is described as one block, but is actually formed by a plurality of units. For example, the torque sensor amplifier 34a and the angle sensor amplifier 34b are formed as separate units. Further, the operation means 35 is provided on the control panel of the unit 包含 including the controller 31, but the control unit 35 may be a separate unit (e.g., a personal computer) connected to the control state 31 via electric thinning. The control unit 30 of the present embodiment refers to the moment and the angle of the guard w and the angle detected by the torque sensor 14 and the angle sensor 15 (both as shown in FIG. The desired waveform mode 'transfers the set angle to the feed amplifier 2 (first image). The waveform of the action (load and deformation amount) assigned to the work J is made by the means 35. The operation means 35 is provided with an input means for a keyboard or the like and a wheeled wire means for a secret touch means. The operator of the torque device of the present embodiment sets the torque, the difference or the torque when the reverse torque test is performed. Angular speed of the van 7 200925598,. For example, the angle of the back and forth torque motion can be set in a sinusoidal manner. The setting result of the operation means 35 is transmitted to the controller 31 and stored in the memory 38. Further, the waveform generating circuit 36 is a circuit for oscillating a signal waveform such as a chopping wave, a triangular wave or a rectangular wave with a desired cycle and timing. More ^ _, the generation t) is to output the value s represented by the formula S=f(1) to the controller 31 in order to use the time 1 as a function of the self-variable. Further, in the above formula a, if the waveform is a sine wave, the period is τ, and the phase is Ο, then f(t) = sin(27C(t - a) / T). At this time, the period τ and the phase a can be set to an arbitrary value by the operation operation means 35. The controller 31 transmits the value of the target wave > from the waveform generating circuit 30 to the value set by the controller 31 for the value set by the operating means 35, and the nose should be sent from the target waveform to the set angle of the servo amplifier 20. Then, the operation unit 35 transmits the signal to the servo amplifier 2 via the signal conversion means 32' by a predetermined angle. With the above configuration, the servo motor 12 can be driven to change the torsion angle of the workpiece w in accordance with a predetermined waveform of a sine wave, a triangular wave or a rectangular wave. The torsion testing device β of the present embodiment performs the angular velocity vibration by the angular velocity of the workpiece W in accordance with the sine wave; the frequency of the == is called, and the upper limit of the angular velocity applied to the workpiece W in the sweep test in the wide frequency region. , that is, the amplitude must be kept constant. However, in the frequency sweep test; the amplitude is kept -^, especially in the high-frequency region, because of the speed of the first-figure, etc., the transmission system and the workpiece J become = slow, and therefore the friction and viscosity caused by the attenuation Thereafter, the difference is sent to the target value (target waveform) of the servo amplifier 20. In the embodiment of 200925598, based on the measured value of the actual displacement of the workpiece w, the feedback control gives the set angle of the servo amplifier 20, and the sweep test is performed with the desired amplitude. Hereinafter, the specific procedure will be described. The third figure shows a program flow chart for performing a frequency-frequency sweep of a certain frequency on the workpiece W mounted on the test apparatus 1 in the present embodiment. The following description is based on this process. First, the operator of the apparatus 1 operates the operation means 35 to "perform the upper limit frequency F max and the lower limit frequency Fmin of the frequency sweep" "whether or not the frequency is swept by the equal interval or the equal interval" "the frequency sweep interval Af"参数 The parameter "Amplitude ros of angular velocity of workpiece W" and "Number of sweeps K" are input to control unit 30 (step S1). In the above parameters, the interval Af is a difference when frequency sweeping is performed at equal intervals, and is proportional to the time interval. In the present embodiment, when the frequency at which the frequency sweep is performed is Fn (n = 1, 2, · · · N), the relationship of the equation 1 is established between F min, • Af, η, and Fn. [Equation 1] When the frequency sweep is equal interval, Fn=F min+Afx(nl). The frequency sweep is equal to the interval F„=FminxAf<I1-1). In addition, even at equal intervals or equal intervals When the frequency sweep is performed, the relationship of Equation 2 holds between Fn, N and F max. [Expression 2]

Fn^F max < Fn+i 9 200925598 That is, the minimum value of Fn is F min, and the maximum value ρ of Fn is not more than the maximum frequency of Fmax. Next, when the speed amplitude constant frequency sweep test is performed in accordance with the following equation 3', the angular amplitude Dn of the rotational axis of the servo motor 12 is obtained (step S2). [Expression 3] 〇 In addition, the reduction ratio of the 'R-type reduction gear unit 13 in the above Expression 3 is given. Continuing, the sine wave of the amplitude D1 and the frequency F1=F min is used as the set angle (that is, Dnxsin(27cxFnxt)' to drive the servo motor 12 (step S3). • Next, the angular velocity of the workpiece W is measured (step S4). In the embodiment, 'in order to more accurately measure the torsion angle of the workpiece W, an acceleration sensor is mounted on the workpiece W' to measure the acceleration around the suspected shaft of the workpiece W. The output of the acceleration sensor is connected to the control via an amplifier. The ratio 埠39 (second diagram), the controller 31 can obtain the speed vM obtained by integrating the acceleration a measured by the acceleration sensor with time, and the mounting position of the accelerometer and the rotating shaft of the workpiece W. With a distance of 1, the angular velocity ω 工件 of the workpiece W is obtained according to the following formula 4 (unit: ra(i / s). The controller 31 measures at least one period, that is, the time 1/Fn2 angular velocity ω Μ, and obtains the maximum angular velocity. (i.e., 'Amplitude of angular velocity'® Mmax. [Expression 4] 200925598 Next, the angular velocity cos set in step S1 is compared with the angular velocity coMmax measured in step S4 (step S5). That is, the ratio of the two angular velocities is When it is 0.95S〇)/scmDMS1.05, it is determined that it is not necessary to change the setting angle given to the servo amplifier 20 (step S5: YES), and the process proceeds to step S6. Further, when the ratio of the two angular velocities does not satisfy the above-mentioned requirements It is determined that it is necessary to change the set angle degree given to the servo amplifier 20 (step S5: NO), and the process proceeds to step S21. In the present embodiment, as described above, the difference between the two angular velocities is within ±5%. However, when performing a more accurate test, the above reference may be more strictly set to ±1% (that is, 0.99$ωδ/ωΜ_$l.oi). In step S21, the angular velocity set in step S1 is performed. And • the determination of the angular velocity оMmax measured in step S4 is greater. That is, the & ten measured value coMmax is greater than the set value (〇 s is large (step § 21: YES), and the process proceeds to step S22. Step S22 is based on The equation 5 calculates the amplitude Dn of the rotation axis of the servo motor 12, and changes the set angle given to the servo amplifier 20 in accordance with the corrected Dn. Next, returns to step S4 and recalculates the amplitude of the angular velocity ®Mmax 0 [Expression 5 ] Δϋ„

Dn = D„ -AD„ η η n xD„ 11 200925598

Further, in step S21, the measured value 〇oMmax is smaller than the set value % (step S21: NO), and the flow proceeds to step S23. In step S23, the amplitude Dn' of the rotation axis of the servo motor 12 is calculated based on the following equation 6', and the set angle given to the servo amplifier 20 is changed in accordance with the corrected Dn. Next, returning to step S4, the amplitude G) Mmax of the angular velocity is again calculated.

[Expression 6J ❹ ΑΌ. :D„

Dn = Dn + ADn As described above, when the ratio of the angular velocity % set in step S1 and the step-by-step angle exceeds the specified reference, the step S6 of adjusting the rotation axis of the servo motor 12 is performed by the processing of the ratio = S~S23. When the measured value is 0^_1 and the setting state is reached, it will stand by until the designated month > G Emperor S is within the reference. Next =;; 7 cycles of the reverse load applied to the workpiece. In this embodiment, the frequency is increased from the minimum value (outgoing) to the maximum value at the frequency ^ to the maximum value Fn). Then, it is reduced to a value of two after the = rate (return to step S7 to judge the current execution of the loop) (step S7: YES), proceeds to step S8 f or backhaul, when the process is NO) Go to step S9. 1糸Return time (Step S7: Step S8 is to determine whether the large value FN is now being performed. If the maximum value F has reached the maximum N (step S8: YES), it is judged that 12 200925598 is the completion of the journey, and the entry is made. Step S32. When the frequency has not reached the maximum value FN (step S8: NO), the process proceeds to step S31. Step S31 is to increase the frequency. That is, when the frequency is now Fn, the frequency is formed as Fn+1. Secondly, returning Step S4, measuring the amplitude of the angular velocity by the frequency ®M max ° Step S9 is to determine whether the frequency of the current test has reached the minimum value Fi. When the minimum value f1 has been reached (step S9: YES), it is determined that the return journey is completed, and the entry is made. Step S10: When the frequency has not reached the minimum value Fi (step S9: NO), the process proceeds to step S32. Step S32 is to reduce the frequency. That is, when the frequency system Fn is now, the frequency is formed. Next, returning to step S4, The amplitude of the angular velocity C 〇 Mmax is measured at the frequency. Step S10 is to check that the test of the current cycle has been completed. That is, when it is determined that the test of the κ cycle set in step S1 has been completed (step Sio : YES) 'in the step S 11 The servo motor 12 is stopped, and the flow is ended. When the number of cycles completed in step S10 is less than κ (step S1: Ν0) 'returns to step S4, and the test of the next cycle is performed. In the present embodiment, the angular velocity amplitude constant frequency sweep test can be performed in such a manner that the set angular velocity amplitude C0S is substantially consistent with the measured angular velocity amplitude ωΜιη&χ. The first embodiment of the present invention described above relates to the torque test 2 However, the present invention is not limited to the above-described constituents. That is, the t invention can be applied even in other types of fatigue test devices using a servo motor: the fatigue measuring device according to the second embodiment of the present invention described below, A so-called universal testing device that applies a tensile, compressive or bending load to a workpiece by a feed screw mechanism driven by a servo motor. The fourth figure shows a block 13 of the fatigue testing device 101 of the present embodiment. The fatigue testing device of the present embodiment can repeatedly apply a tensile, compressive or bending load on the test piece (workpiece). The test device 1〇1 of the present embodiment has a device body 110' for driving the device body feeding amplifier 120 and a control servo amplification unit 130. The device body 110 has a frame dynamic transformation. 11113, the load sensor 114, the sense of displacement, the device 115 and the adapters 118a and 118b. 直 The linear motion converter 113 is used to move the servo motor 112 in the straight forward direction, and has: a feed screw pair guide And the moving block 113d corresponding to the guide rails respectively. The nut H3b and the feed screw 113 are attached to the nut n3b. The moving block can move along the edge of the second and the second guide ll3e, and cannot move outside the second side. Therefore, the movement of the moving block 113d and the nut U3b is limited to the direction in which the direction of the production rail 113e is extended, and the direction of the vehicle direction and the direction in which the guide rail 113c protrudes = the second movement protection, by the feeding motor 112 The feed screw 1 i3a is rotated === the guide rail 113c is moved. As shown in the fourth figure, the service motor 112 is fixed on the platform llla of the Mm platform, and the sorcerer is on the platform part llla. Thus, the nut 113b is called up and down. Further, a lower adapter 118a for the temple workpiece w from below is attached to the nut. Further, it is suspended below the top plate 111b of the adjacent frame 111. #1171. The upper surface of the lower layer is provided with a guide hole extending in the upper direction of the figure. The hole is formed on the upper end of the stage 116 so that the hole U6a passes through the through hole 116a. The upper Weikou 116 can be moved in the up and down direction along the guide rod u7c. Further, the inner diameter of the through hole 116a can be reduced by screwing it to the upper stage, and the upper stage 116 can be borrowed. Underneath the upper stage 116, Amher

A bolt (not shown) of 6 can hold the load 1 on the workpiece w in the state where the guide rod 117c is fixed and the workpiece is held between the parts of the joint 117, and the upper portion and the lower adapter ll8a can be applied to the workpiece w. And l18b respectively can be attached to and detached from the upper stage yoke and the nut 113b, and can be selected according to the type of load applied to the jade piece w. Since the fourth figure is a configuration in which a compressive load is applied to the workpiece w, the lower surface of the upper adapter 118b and the upper surface of the lower adapter are formed in a planar shape. When a tensile load is applied to the workpiece W, the adapters li8a and 118b for holding the chuck of the workpiece W are placed. For the two-point bending test, the combination is used for the adapter for compression test and the clamp for three-point bending. Further, the upper stage 116 is suspended from the top plate 1Ub of the frame 111 by the feed screw 117a. Buried with the feed screw u7a in the top plate mb

A nut that rotates in combination (not shown). The nut is rotationally driven by a motor 117b disposed on the top plate 111b. Further, by connecting the link of the feed screw 117a and the upper stage 116, the feed screw U7a rotates the upper stage 116 around its axis. Therefore, when the bolt of the upper stage 116 is loosened and the nut is rotated by the motor 117b while the upper stage 116 is movable, the feed screw 117a can be driven in the up-and-down direction and the upper portion can be connected to the feed screw n7a. Stage 116. This function is used to adjust the interval between the adapters 118a and ι 8 8 in accordance with the size of the workpiece w. That is, when the test is performed, the bolt is tightened, and the upper stage 116 is fixed to the guide rod 117c. In the above-described configuration, when the servo motor 112 is driven while holding the workpiece 15 200925598 W by the adapters 118a and 118b, a tensile, compressive or bending load is applied to the workpiece w, and the magnitude thereof is measured by the load cell 114. In addition, the displacement sensor 115 detects the displacement of the lower adapter, that is, detects the opening of the workpiece W > ^: the sensor (such as a dial gauge inserted into the rotary encoder) ° and The first embodiment similarly controls the servo motor 112 by the servo amplifier 120. That is, the servo amplifier 12 generates drive power for driving the servo motor 112 based on the target value transmitted from the control unit 13 (the rotation axis angle of the target servo motor), and sends it to the servo 112 to drive it. . The servo motor 112 is provided with a rotary encoder 112 & for detecting the number of revolutions and the angle of rotation of the servo shaft 112. The signal output of the rotary encoder 112a is connected to the servo amplifier 12A, and the servo amplifier 120 performs feedback control based on the measurement results of the rotary encoder 112&. two

Next, the configuration of the control unit 130 will be described. The fifth diagram is a block diagram of the control unit 130_ of the present embodiment. As shown in the figure, the control unit 130 of the present embodiment can be replaced with a load sensor instead of a torque sensor, and a displacement sensing H instead of the sensation hall. The examples are the same. Therefore, in the control unit 13 (), the same or similar components as those in the first embodiment of the invention are denoted by the same reference numerals, and the details of the control unit 130 are omitted. The control unit m of the present example refers to the workpiece w = and the deformation ί ' produced by the load sensor ι 4 and the displacement sensing 115 (both reduced to the fourth figure), and the load or the amount of deformation is displayed with time. The way of the waveform, the transmission angle is set to the word service amplifier 12〇). 101 200925598 To set the magnitude of the load, deformation, etc. during the repeated test. For example, the displacement amplitude when a sinusoidal reverse compression displacement is applied to the workpiece w can be set. The controller 31 multiplies the value set by the operation means 35 by the value transmitted from the waveform generating circuit 36 to the controller 31, calculates the target value, compares the target value with the load detected by the load sensor 114, or shifts The amount of deformation detected by the sensor 115 (or the time differential value of these times) is calculated to be sent to the set angle of the servo amplifier 120. The calculated set angle is transmitted to the servo © amplifier 120 via the signal conversion means 32. According to the above configuration, the servo motor 112 can be driven such that the load applied to the workpiece W or the deformation amount of the workpiece W fluctuates according to a predetermined waveform of a sine wave, a triangular wave or a rectangular wave. In addition, as in the first embodiment, the test device 101 of the present embodiment can perform a certain frequency sweep test of the speed amplitude, and can change the speed of the workpiece W according to the sine wave waveform, and gradually increase or decrease the frequency of the waveform. And a repetitive load is applied to the workpiece in a wide frequency region.曰 中 In this sweep test, the amplitude applied to the workpiece w, that is, the amplitude must be kept constant. However, S, in the frequency sweep test, especially in the high-frequency region, it is necessary to consider the transmission system and the workpiece w due to the feed screw 4 member 113 (fourth figure), etc., and therefore, etc. After the influence of the noise and the noise, the target value sent to the servo amplifier 120 (target, in the present embodiment, the measured value according to the actual displacement of the guard w > the set angle of the amplifier 120) is desired The amplitude "frequency frequency test. Hereinafter, the specific procedure is explained. In this embodiment, the speed amplitude-fixed frequency sweep test is also performed according to the flowchart shown in the third figure. Therefore, the description of τ is First, the operator of the device 101 operates the operation means 35 to "perform the upper limit frequency F max and the lower limit frequency Fmin of the frequency sweep" "whether the frequency is performed at equal intervals or equal intervals" The parameter of the frequency sweep "frequency sweep interval Af" "the amplitude Vs of the velocity of the workpiece W" and the sweep frequency K is input to the control unit 30 (step S1). Within the above parameters, the interval Af is frequency-equivalently When sweeping is bad, to compare In the present embodiment, when the frequency at which the frequency sweep is performed is Fn (n=l, 2, · · · N), between F min, ❹ Af, 11 and Fn, the equation The relationship of 1 is established. Further, even when the frequency sweep is performed at equal intervals or equal intervals, the relationship of the above equation 2 is established between Fn, N and F max . That is, the minimum value of Fn is F. Min, the maximum value of Fn, FN, does not exceed the maximum frequency of F max. - Next, when the speed amplitude constant frequency sweep test is performed according to the following Equation 7, the angular amplitude Dn of the rotation axis of the servo motor 12 is obtained (step S2). ® [Expression 7]

Vs

FnxL Further, in the above Equation 7, the lead of the L-feed screw 113 (unit mm/rev). Continuing to use the sine wave of amplitude Di and frequency Fi=F min as the set angle (ie, Dnxsin (27ixFnxt)) to drive the servo motor 12 (step S3). 18 200925598 Next, 'measure the speed of the workpiece W (step S4). In the embodiment, in order to more accurately measure the speed of the workpiece w, a f-degree sensor ' is mounted on the workpiece w to measure a speed at a specific position on the surface of the workpiece w. The output of the accelerometer is connected to the control via an amplifier. Part % ^ analog 埠 39 (second diagram), the controller 31 can obtain the speed Vm of the workpiece W by integrating the acceleration a measured by the acceleration sensor with time (unit: the controller 31 can measure at least one cycle and also immediately

The velocity Vm of 1/Fn is obtained, and the maximum value of the velocity (i.e., the amplitude of the velocity) VMmax is obtained. Next, the speed Vs set in step S1 and the speed VMmax measured in the step are compared (step S5). In other words, when the ratio of the two speeds is 0.95 Vs/V^4max $1·05, it is determined that the setting angle given to the servo amplifier 20 is not required to be changed (step S5: YES), and the process proceeds to step S6. When the ratio of the two speeds does not satisfy the above-described specifications, it is determined that it is necessary to change the setting angle given to the servo amplifier 2 (step S5: NO), and the process proceeds to step S2. In the present embodiment, as described above, The difference between the two speeds is within ±5%. However, when the test is more accurate, the above reference can be more strictly set to ±1M, that is, o.99$Vs/vMm "1〇1). In step S21, it is determined whether the speed Vs set in step S1 and the speed vMmax measured in step S4 are large. That is, when the measured value VMmax is larger than the set value Vs (step S21: YES), the routine proceeds to step S22. In step S22, the amplitude Dn' of the rotation axis of the servo motor 12 is calculated according to the following equation 8, and the set angle of the servo amplifier 20 is given in accordance with the change after the correction. Next, the process returns to step %, and the amplitude VMmax of the speed is again calculated. 200925598 [Digital formula △D η

D„=Dn−ADn Further, 'the measured value VMmax is smaller than the set value Vs in step S21 (step S21: NO)' proceeds to step S23. Step S23 calculates the rotational axis of the servo motor 12 according to the following formula 9. The amplitude Dn is changed to the set angle of the servo amplifier 20 in accordance with the corrected Dn change. Next, returning to step S4, the amplitude vMmax of the speed is again measured. [Expression 9]

xDn Όα=Όη+ΑΌη ❹ As described above, the ratio of the speed % set in step S1 to the speed VMmaxi measured by the lining S4 exceeds the specified reference point S21 to S23, and the rotation axis of the feeding motor 12 is adjusted. article. Step S6 is the leaf measurement value \_ and the set value). Then, the rate is reduced to 1 step... to judge the current execution; go to the second suspect 20 200925598 (step S7: YES), and proceed to step S8. When the return is made (step S7: NO), the process proceeds to step S9. Step S8 is to determine whether the frequency at which the test is currently performed has reached the maximum value FN. When the maximum value FN has been reached (step S8: YES), it is determined that the departure is completed, and the process proceeds to step S32. When the frequency has not reached the maximum value FN (step S8: NO), the process proceeds to step S31. Step S31 is to increase the frequency. That is, when the frequency is now Fn, the frequency is formed as Fn+1. Next, returning to step S4, the amplitude of the angular velocity ©Mmax is measured at the frequency. ❹ Step S9 determines whether the frequency at which the test is currently performed has reached the minimum value. When the minimum value Fi has been reached (step S9: YES), it is determined that the return journey is completed, and the process proceeds to step S10. Further, when the frequency has not reached the minimum value Fi (step S9: NO), the process proceeds to step S32. Step S32 is to reduce the frequency. That is, when the current frequency is Fn, • the frequency is Fn-i. Next, returning to step S4, the amplitude VMmax of the velocity is measured at the frequency. Step S10 checks that the test of the first few cycles has been completed. That is, when it is determined that the test of the K cycle set in step S1 has been completed (step S10: YES), the servo motor 12 is stopped in step S11, and the flow is ended. Further, when the number of cycles completed in step S10 does not reach K (step S10: NO), the process returns to step S4 to perform the test of the next cycle. As described above, according to the present embodiment, the speed amplitude constant frequency sweep test can be performed in such a manner that the set speed amplitude Vs and the measured speed amplitude VMmax are substantially identical. Next, a third embodiment of the present invention will be described in detail using the drawings. Fig. 6 is a block diagram showing the fatigue test apparatus of the third embodiment of the present invention. The fatigue test apparatus of this embodiment is a fatigue test apparatus which can apply a torsion load repeatedly on a test piece (work). 21 200925598 As shown in the sixth figure, the test apparatus of the present embodiment has a device body 210 for applying a torsional load on the workpiece W, a servo amplifier 220 for driving the servo motor 212 of the device body 210, and a control servo amplifier 220. Control unit 230. The apparatus body 210 has chucks 211a, 211b, a servo motor 212, a speed reducer 213, a torque sensor 214, and an angle sensor 215. The chucks 211a and 211b hold the workpiece w from both ends. The speed reducer 213 is disposed between the drive shaft of the servo motor 212 and one of the chucks 211 & and increases the torque of the drive shaft of the servo motor 212 to be applied to the workpiece w. Further, the other chuck is fixed to the frame of the apparatus body (not shown) via the torque sensor 214. In the configuration described above, when the servo motor 212 is driven, a torsional load is applied to the workpiece W held by the chucks 211a, 211b, and the magnitude thereof is measured by the torque sensor 214. Further, the angle sensor 215 sets the output shaft of the speed reducer 213 to detect the torsion angle of the workpiece w in the vicinity of the chuck 2lla. The servo motor 212 is controlled by a servo amplifier 220. That is, the servo amplifier 220 generates drive power for driving the servo motor 212 in accordance with the set angle transmitted from the control unit 230 (the rotation axis angle of the servo motor as the target), and sends it to the servo motor 212 to drive it. . The tamper motor 212 is provided with a rotary encoder 212a for detecting the number of revolutions and the angle of the rotating sleeve of the feeding motor 212. The signal output of the rotary coder 212a is connected to the servo amplifier 220, and the servo amplifier 220 performs feedback control of the drive power based on the measurement result of the rotary encoder 212a. Next, the configuration of the control unit 230 will be described. The seventh diagram is a block diagram of the control unit 230 of the present embodiment. As shown in the seventh figure, the control unit 230 of the present embodiment includes a controller 331, a signal conversion means 332, a 22 200925598 conversion means 333, a torque sensor amplifier 334a, an angle sensor amplifier 334b, an operation means 335, A waveform generation circuit 336, a floppy disk drive (FDD) 337, a memory 338, and an analog 埠 339. Further, in the sixth and seventh figures, the control unit 23 describes a single element, but actually it is formed by a plurality of units. The torque sensor amplifier 334a and the angle sensor amplifier 334b are formed as separate units. Further, the operation means 335 is provided on a control panel outside the casing of the unit including the controller 331, but may be a separate unit (e.g., a personal computer) connected to the controller 331 via a cable. The control unit 230 of the present embodiment refers to the moment and angle of the workpiece w detected by the torque sensor 214 and the angle sensor 215 (both as shown in FIG. 6), and displays the hope with time or time of the moment or angle. The mode of the waveform 'transfers the set angle to the servo amplifier 220 (sixth figure). The waveform imparted to the workpiece W (load and deformation amount) is set using the operation means 335. The operation means 335 includes an input means such as a keyboard and a display means for recognizing the input result of the input means, and the operator of the torque test apparatus of the present embodiment can operate the operation means 335 to set the reverse torque test. The range of moments, angles, or angular velocities. For example, the amplitude of the angular variation when the back and forth torque motion is performed in a sinusoidal wave shape can be set. The setting result of the operation means 335 is transmitted to the controller 331, and stored in the memory 338. Further, the waveform generating circuit 336 is a circuit that generates signal waveforms such as sine waves, triangular waves, and rectangular waves in a desired cycle and timing. More specifically, when f(t) is a function of the time t as a self-variable, the value s expressed by the equation s=f(t) is sequentially output to the controller 331. Further, in the above formula, when the waveform is a sine wave, the period is set to T, and the phase is set to 23 200925598 a', and f(t) = sin(2Ti(t - a) / T). At this time, the period T and the phase a can be set to arbitrary values by the operation means 335. The controller 331 multiplies the value transmitted from the waveform generating circuit 336 to the controller 331 by the value set by the operating means 335 to calculate the target waveform, and calculates the set angle to be sent from the target waveform to the servo amplifier 22A. Then, the calculated set angle set by the operation means 335 is transmitted to the servo amplifier 220 via the signal conversion means 332.

With the above configuration, the servo motor 212 can be driven to change the torsion angle of the workpiece W in accordance with a predetermined waveform of a sine wave, a triangular wave or a rectangular wave. In addition, the 'torque testing device of the embodiment can perform the angular acceleration amplitude certain frequency sweep test' can be made by changing the angular acceleration of the workpiece W according to the sine wave waveform, and gradually increasing or decreasing the frequency of the waveform, and repeating in the wide frequency region. A load is applied to the workpiece. In this sweep test, the upper and lower limits of the angular acceleration applied to the workpiece W, that is, the amplitude must be kept constant. However, in the frequency sweep test, in order to keep the amplitude constant, especially in the high frequency region, it is necessary to consider the slow response of the transmission system and the workpiece w itself due to the reduction of the machine 213 (sixth figure). Therefore, after the influence of the friction and the viscosity caused by the attenuation, the target value (target waveform) sent to the servo amplifier 22 is calculated. In the embodiment, the set value is given to the servo amplifier 220 based on the measured value of the actual displacement of the workpiece W, and the frequency sweep test is performed with the desired amplitude. Hereinafter, the specific procedure will be described. The eighth figure shows the program flow of the frequency sweep test of the acceleration amplitude at the factory installed in the test apparatus in the present embodiment. The following description is based on this process. First, the operator of the device operates the operation means 335 to "perform the upper limit frequency Fmax and the lower limit frequency Fmin of the frequency of the 200925598 frequency sweep" "whether or not to perform frequency sweep at equal intervals or equal intervals" "frequency sweep interval Af" The parameter "the amplitude of the angular acceleration of the workpiece W as" and the "the number of times of the sweep K" are input to the control unit 230 (step S101). In the above parameters, the interval Af is a difference when frequency sweeping is performed at equal intervals, and is proportional to the time interval. In the present embodiment, when the frequency at which the frequency sweep is performed is Fn (n = 1, 2, · · · N), the relationship of Equation 10 is established between F min, Δf, η, and Fn. © [Expression 10] When the frequency sweep is equal to the interval, Fn=Fmin+Afx(nl)' When the frequency sweep is equal to the interval, even if the frequency sweep is performed at equal intervals or equal intervals, at Fn Between N and F max , the relationship of Equation 11 holds. ❹ [Expression 11]

Fn^F max < Fn+i That is, the minimum value of Fn is F min, and the maximum value of Fn FN does not exceed the maximum frequency of F max . Then, when the angular acceleration amplitude constant frequency sweep test is performed according to the following formula 12, the angular amplitude Dn of the rotation axis of the servo motor 212 is obtained (step S102). 25 200925598 [Expression 12] 〇„

asxR ¥η2χ4π2 Further, in the above formula 12, the reduction ratio of the R-type reduction gear 213. Continuing to 'take the sine wave of the amplitude Di and the frequency F1=p min as the set angle (ie, Dnxsin(2axFnxt)) to drive the servo motor 212 (step S103). Next, 'measure the angular acceleration of the workpiece W (step S1〇4) In the present embodiment, in order to more accurately measure the torsion angle of the workpiece W, an acceleration sensor is mounted on the workpiece W to measure the acceleration around the rotating shaft of the workpiece w. The output of the acceleration sensor is connected to the control via an amplifier. In the analogy 339 of the portion 230 (the seventh figure), the controller 331 can calculate the acceleration aM measured by the acceleration sensor and the distance between the mounting position of the accelerometer and the rotating shaft of the workpiece W by the following formula 13 Obtain an angular acceleration α 工件 of the workpiece W (unit: rad/s2). The controller 331 measures at least one period, that is, an angular acceleration α F of time 1/Fn, and ❹ obtains the maximum value of the angular acceleration (that is, the amplitude of the angular acceleration) aMmax. [Expression 13] Next, the angular acceleration as set in step S101 and the angular acceleration aMmax measured in step S104 are compared (step S105). That is, the ratio of the two angular accelerations satisfies 0.9. When 5 S as/aMmaxS 1.05, it is judged that 26 200925598 is not required to change the set angle given to the servo amplifier 220 (step S105: YES) 'and proceeds to step si 〇 6. In addition, the ratio of the two angular accelerations does not satisfy the above. When it is predetermined, it is determined that it is necessary to change the set angle given to the servo amplifier 220 (step S105: NO), and the process proceeds to step S121. In the present embodiment, as described above, the difference between the two angular accelerations is within ±5%. Benchmark, however, when performing a more accurate test, the above reference can be more strictly set to ±1% (that is, 〇99$as/^Mmax=1-01). In step S121, 'Step S101 is set. The angular acceleration 〇as is determined to be larger than the angular acceleration aMmax measured in step S104. That is, when the measured value aMmax is larger than the set value as (step S121: YES), the process proceeds to step S122. Step S122 is based on the following number Equation 14 calculates the amplitude Dn of the rotation axis of the servo motor 212, and changes the setting angle given to the servo amplifier 220 in accordance with the corrected Dn. Next, returns to step S104 to recalculate the amplitude of the angular acceleration ClMmax. ] ❹

Δϋ = brain xD n % female n 〇 η = 〇 η - Δϋ η In addition, in step S121, the measured value aMmax is smaller than the set value as (step S121: NO), and the flow proceeds to step S123. In step S123, the amplitude Dn of the rotation axis of the servo motor 212 is calculated based on the following equation 15, and the set angle given to the servo amplifier 220 is changed in accordance with the corrected team. Next, return to step s丨, and then operate 27 200925598 to calculate the amplitude aMmax of the angular velocity. [Expression 15]

XD „ As described above, when the ratio of the angular velocity as set in step S101 to the angular velocity aMmax measured in step S104 exceeds the specified reference, the amplitude of the rotational axis of the servo motor 212 is adjusted by the processing of steps S121 to S123. In step S106, the measured value aMmax and the set value as are within the reference, and wait until the repeated load of the specified cycle is applied to the workpiece. Next, the process proceeds to step S107. In the present embodiment, the frequency is increased from the minimum value Fi to The maximum value Fn (outbound), after the frequency reaches the maximum value, reduces the frequency to F! (return). Then, it is used as a loop to perform the test of the K loop. Step S107 is to judge the current execution. Or the return trip is the time of the departure (step S107: YES) 'Go to step S108. When it is the return trip (step S107: NO), the process proceeds to step S109. Step S108 is to determine whether the frequency of the current test has reached the maximum value FN. When the maximum value Fn is reached (step si〇8: YES), it is determined that the departure is completed, and the process proceeds to step S132. In addition, when the frequency has not reached the maximum value FN (step S108: NO), Step S131. Step S131 is to increase the frequency. That is, when the frequency system Fn is now, the frequency is formed as Fn+1. Secondly, the process returns to step S104, and the amplitude aMmax of the angular acceleration is measured at the frequency. 28 200925598 = Step S1〇9 It is determined whether the frequency of the current test has arrived, the small value Fl ° has reached the minimum value Fi (step S109: YES), and the process returns to step S11. In addition, when the frequency has not yet been checked for the minimum value Fi (step Sl〇9 : N〇), proceeds to step sn2. Step S132 is performed to reduce the frequency. That is, the current frequency F forms the frequency Fn^. Next, returns to step S104, and the amplitude aMr of the angular acceleration is calculated by the frequency. Lmax Step S110 checks that the test of the first few cycles has been completed.

In other words, it is determined that the test of the κ cycle set in step S101 has been completed (step S110: YES), and the servo motor is stopped in step S111, and the flow is ended. Further, when the number of cycles completed in step S110 reaches K (step su〇: N〇), the process returns to step sl4, the test of the loop. I. Two owing As described above, according to the present embodiment, the angular acceleration amplitude of a certain frequency sweep test can be performed in such a manner that the set angular acceleration amplitude as is substantially the same as the measured angular acceleration amplitude aMmax. The third embodiment of the present invention described above relates to a torque testing device. However, the present invention is not limited to the above-described constituents. That is, the present invention is applicable even in other types of fatigue test apparatuses using servo motors, and the fatigue test apparatus of the fourth embodiment of the present invention described below is a feed screw that can be driven by a servo motor. Mechanism, a so-called universal test device that applies a tensile, compressive or bending load to a workpiece. The ninth diagram shows the block diagram of the fatigue test apparatus 4〇1 of the present embodiment. The fatigue testing device of the present embodiment can repeatedly apply a tensile, compressive or bending load on the test piece (workpiece). As shown in the ninth figure, the test apparatus 401 of the present embodiment has a device body 410 for applying a load on the workpiece W, a servo amplifier 420 for driving the servo motor 412 of the device body 29 200925598 410, and a control servo amplifier 420. Control unit 430. The apparatus body 410 has a frame 411, a servo motor 412, a linear motion converter 413, a load sensor 414, a displacement sensor 415, and adapters 418a and 418b. The linear motion converter 413 is for converting the rotational motion of the rotary shaft of the servo motor 412 into a motion in the straight forward direction. And having: a feed screw 413a, a nut 413b, a pair of guide rails 413c, and corresponding to the guide rails, respectively

Move block 413d of 413c. The nut 413b is coupled to the feed screw 413a. Further, the moving block 413d is fixed to the nut 413b. The moving block 413d is movable along the corresponding rail 413c and cannot be moved in its outer direction. Thus, the movement of the moving block 413d and the nut 413b is limited to one degree of freedom in the direction in which the guide rail 413c protrudes. Further, since the axial direction of the feed screw 413a is parallel to the direction in which the guide rail 413c projects (i.e., the vertical direction), the nut 413b moves along the guide rail 413c when the servo motor 412 rotates the feed screw 413a. As shown in the ninth figure, the servo motor 412 is fixed to the lower portion of the frame portion 411a of the frame 411, and in addition, the guide 413c is fixed to the platform portion 411a. Therefore, the nut 41 replenishes the platform portion 411a up and down. Further, a lower adapter 418a for holding the workpiece W from below is attached to the nut. The upper stage 416 is suspended from the lower surface of the top plate 4Ub of the frame 411. The upper portion of the platform portion 411a is provided with a driving cup 417c extending upward in the drawing. A through hole 416a that is perforated in the upper q direction is formed at the end portion of the upper stage 416 in the left-right direction. The guide rod 417c passes through the through hole 416, so that the upper stage 416 can be moved up and down along the guide rod 417c. Further, the inner diameter of the hole 4 is bored by screwing a bolt (not shown) provided on the upper stage 416, whereby the guide bar We can be fixed to the upper stage 416. An upper adapter 418b for holding the workpiece '200925598 from above is mounted below the upper stage 416. In the present embodiment, by holding the workpiece W between the upper joint and the lower adapter 418a, the 413b is moved up and down to apply a load on the workpiece w. Further, the upper and lower articulators 418a and 418b respectively constitute a load adapter that can be attached to the workpiece w in response to the upper load and the nut 413b. Because the ninth figure is formed on the top of the workpiece (four), the top surface of the crucible is formed into a flat shape. Applying tensile negative on the workpiece... Second connection: Using the adapter that sets the chuck for holding the workpiece w, === Combining the adapter for testing with the system and three points to the second? = top coffee ^ 417a The top plate 4Ub is embedded in the motor that can be rotated with the feed screw f on the top plate. This is linked to the chain of the upper stage 416, and the feed screw = rotates around the carrier shaft. Therefore, in the state where the upper portion is unscrewed, the nut is rotated by 417b in a state where the upper stage 416 is movable, and the feed screw 417a can be driven in the up and down direction to connect the upper stage. The size adjustment adapter 4i8a of the workpiece w is fixed. When the test is performed, the bolt is tightened, and the upper part is loaded with w and the second is connected to the Yang to maintain the workpiece shrinkage or the f-curved load, and the tension is applied to the lower 2^. The position sensor 415 detects the sensor of the deformation amount of the portion, and the sensor (such as the plug: the transcoder 31 200925598 controls the feeding motor 412 by the servo amplifier 420 as in the third embodiment. That is, the load amplifier 420 generates drive power for driving the servo motor 412 in accordance with the target value transmitted from the control unit 430 (the rotation axis angle of the target servo motor), and sends it to the feeding motor 412 to drive it. The servo motor 412 is provided with a rotary encoder 412a for detecting the number of revolutions, the angle, and the like of the rotary shaft of the servo motor 412. The signal output of the rotary encoder 412a is connected to the servo amplifier 420, and the feed amplifier 420 is measured according to the rotary encoder 412a. As a result, the feedback control is performed. Ο Next, the configuration of the control unit 43 is described. The tenth diagram is a block diagram of the control unit 430 of the present embodiment. As shown in the figure, the control unit 430 of the present embodiment can be connected to the load separately. Sensing Instead of the torque sensor, and the displacement sensor instead of the angle sensor, it is the same as the third embodiment of the present invention shown in the seventh figure. Therefore, the control unit 430 is invented with the present invention. In the third embodiment, the same or similar constituent elements are denoted by the same reference numerals, and the detailed description of the control unit 430 is omitted. The control unit 430 of the present embodiment refers to the load sensor 414 and the displacement sensor 415 (both are described). In the ninth diagram, the load and the amount of deformation of the workpiece w detected are transmitted in such a manner that the desired waveform is displayed as the load or the amount of deformation changes with time, and the set angle is transmitted to the servo amplifier 42 (Fig. 9). The action waveform is set using an operation means. The operator of the test apparatus 401 of the present embodiment can operate the operation means 335 to set the magnitude of the load, the amount of deformation, and the like when performing the reverse test. For example, the sine can be set on the workpiece W. The amplitude of the displacement when the wave shape is reversely compressed is shifted. The controller 331 multiplies the value set by the operation means 335 by the value transmitted from the waveform generation circuit 336 to the controller 331 to calculate the value. 32 200925598 The value "samps" the target value and the load detected by the load sensor 414, or the amount of deformation detected by the displacement sensor 415 (or the deformation speed of the time 1 minute), the calculation should be sent The set angle to the servo amplifier 420. The calculated set angle is transmitted to the servo amplifier 420 via the signal conversion means 332. With the above configuration, the amount of deformation that can be applied to the workpiece W or the workpiece W is sinusoidal, triangular or The servo motor 412 is driven to change the predetermined waveform of the rectangular wave. Further, similarly to the third embodiment, the test apparatus 401 of the present embodiment can perform a certain amplitude sweep test of the acceleration amplitude by sinusoidal acceleration of the workpiece w. The waveform of the wave changes, and the frequency of the waveform is gradually increased and decreased, and a reverse load is applied to the workpiece in a wide frequency region. Ο Ο In this sweep test, the upper and lower limits of the acceleration applied to the workpiece W, that is, the amplitude must be kept constant. However, in the frequency sweep test, in order to keep the amplitude constant, especially in the high frequency region, it is necessary to consider the slow response due to the elasticity of the transmission system and the workpiece of the screw member 413 (Fig. 9), and thus, etc. After the influence of friction and viscosity, the calculation is sent to the target value of the feeding amplifier 420. In the present embodiment, the feedback control is given to the set angle of the servo amplifier 420 according to the measured value of the actual displacement of the workpiece W, and the frequency sweep test is performed in the desired frame. Hereinafter, the specific procedure will be described. In this embodiment, the acceleration amplitude is also a frequency sweep test according to the flowchart shown in FIG. Therefore, it is formed according to the eighth figure. The explanation under X is based on the fact that the operator of the device 401 operates the operation means to say that the upper frequency Fmax of the line frequency sweep and the lower limit frequency F "/to enter the equal interval or the equal interval interval frequency sweep" "$3 = M" "Amplitude As of the acceleration of the workpiece W" "Sweep frequency frequency 33 200925598 number input control unit 430 (step S101). The interval "Af in the parameter" is frequency sweep at the slip interval. In this embodiment, when the frequency of the frequency sweep is Fn (n=1, 2, · · · N), the relationship between the above equations is between F _, η and Fn. In addition, when the frequency sweep is performed at equal intervals or equal intervals, the relationship between the above equation U is still established between 匕, ^^ and max. That is, the minimum value of Fn is F coffee, 匕之之The maximum value & does not exceed the maximum frequency of F max. The broadcaster obtains the angular amplitude of the rotational axis of the motor 412 by a certain frequency according to the following equation 16 '. Equation 16]

, K

2^xFn2 xL In addition, the lead of the 'L series feed screw 413 in the above formula 16 (unit mm/rev). Continuing, the sine wave of amplitude Di and frequency FpF is used as the set angle (that is, Dnxsin (27ixFnxt) to drive the servo motor 412 (step S103). Next, the speed of the workpiece W is measured (step s1〇4). In order to more accurately measure the acceleration of the workpiece w, an acceleration sensor is mounted on the workpiece w to measure a specific bit acceleration on the surface of the workpiece w. The output of the acceleration sensor is connected via an amplifier = 34 of the second set 200925598 part 430 Analog 埠 339 (the tenth figure), the controller 331 can obtain the acceleration AM (unit: mm/s2) of the workpiece W measured by the acceleration sensor. The controller 331 measures at least one period, that is, the time 1/Fn2 acceleration AM The maximum value of the acceleration (i.e., the amplitude of the acceleration) AMmax is obtained. Next, the acceleration As set in step S101 and the acceleration AMmax measured in step S104 are compared (step S105). That is, the ratio of the two accelerations is satisfied. When it is 0.95SAs/AMmax$1.05, it is determined that it is not necessary to change the setting angle given to the servo amplifier 420 (step O S105 : YES), and the process proceeds to step S106. When the above-described regulations are not satisfied, it is determined that the setting angle given to the servo amplifier 420 needs to be changed (step S105: NO), and the process proceeds to step S121. In the present embodiment, as described above, the difference between the two accelerations is ±5. % is used as a reference. However, when a more accurate test is performed, the above reference can be more strictly set to ±1% (that is, 0.99$AS/AMmax^1.01). In step S121, the setting in step S101 is performed. The acceleration As is different from the acceleration AMmax measured in step S104. That is, when the measured value AMmax is larger than the set value As (step S121: YES), the process proceeds to step S122. Step S122 is based on the following equation The amplitude Dn of the rotation axis of the servo motor 412 is calculated by π, and the set angle given to the servo amplifier 420 is changed in accordance with the corrected Dn. Next, the process returns to step S104, and the amplitude AMmax of the acceleration is calculated again. [Expression 17] 35 200925598 △ Dn

Dn = Dn - ΔΌη xD „ In addition, in step S121, the measured value AMmax is smaller than the set value As (step S121: NO), and the flow proceeds to step S123. Step S123 calculates the rotational axis of the servo motor 412 according to the following equation 18. The amplitude Dn' is given to the set angle of the servo amplifier 420 according to the modified team change. Secondly, returning to step s 1 , the amplitude of the measured acceleration AMmax is again measured. [Expression 18]

ADn = ~As|xD Δ η ^Mmax • Dn=Dn+ADn ❹ As described above, the ratio of the acceleration & set in step S1〇1 to the measured acceleration Αμ_ exceeds the specified reference & The processing of the two steps S121 to S123 adjusts the amplitude of the rotation axis of the servo motor 412. On the other hand, the S1G6 system measurement value AMmax and the setting As are within the reference 〜', and the standby load is applied to the workpiece at a specified cycle. The two of them proceed to step S107. In the example of f, the frequency is increased from the minimum value F1 to the maximum value Fn 鋥). And after the frequency reaches the maximum value FN, the frequency is reduced to F1 (back to step SliL, > as a loop, the test of the K loop is performed. 7 The system judges that the current execution is a process of going or returning, 36 200925598 (step S107: YES), the process proceeds to step S108. When the process returns (step S107: NO), the process proceeds to step S109. Step S108 is to determine whether the frequency of the test is now reaching the maximum value FN. When it is determined (YES in step S108: YES), the process proceeds to step S132. When the frequency has not reached the maximum value FN (step S108: NO), the process proceeds to step S131. Step S131 is to increase the frequency. When the frequency is Fn, the frequency is formed as Fn+1. Next, the process returns to step S104, and the amplitude of the angular velocity (〇Mmax) is measured at the frequency.

Step S109 is to determine whether the frequency at which the test is currently performed has reached the minimum value Fi. When the minimum value F1 has been reached (step si〇9: YES), it is determined that the return trip is completed, and the flow proceeds to step S110. Further, when the frequency has not reached the minimum value Fi (step si〇9: NO), the flow proceeds to step S132. Step S132 is to reduce the frequency. That is, when the frequency is now Fn, the frequency is formed as Fn-!. Next, returning to step S104, the amplitude AMmax of the acceleration is measured at the frequency. 'Step S110 is to check that the test of the first few cycles has been completed. That is, when it is determined that the test of the κ cycle set in step S101 has been completed (step Slio: YES), the servo motor 412 is stopped in step S111, and the flow is ended. Further, when the number of cycles completed in step S110 is less than κ (step S11 〇 : NO), the process returns to step S104 to perform a loop test. - As described above, according to the present embodiment, the acceleration amplitude constant frequency sweep test can be performed in such a manner that the set addition 8.5 is substantially consistent with the measured acceleration amplitude AMmax. Second, [Simplified description of the drawings] The first figure shows an overview of the fatigue test of the first embodiment of the present invention 37 200925598. The second drawing is a block diagram of the control unit of the fatigue testing apparatus of the first embodiment of the present invention. The third figure is a flow chart for performing a frequency sweep of a certain frequency in the first and second embodiments of the present invention. The fourth figure shows an overview of the fatigue testing apparatus of the second embodiment of the present invention. Fig. 5 is a block diagram of a control portion of the fatigue testing device of the third embodiment of the present invention. © Fig. 6 is a view showing an outline of a fatigue testing apparatus according to a third embodiment of the present invention. The seventh drawing is a block diagram of the control unit of the fatigue testing apparatus of the third embodiment of the present invention. The eighth figure is a flow chart of the acceleration-degree amplitude constant frequency sweep test in the third and fourth embodiments of the present invention. The ninth drawing shows an outline of the fatigue testing apparatus of the fourth embodiment of the present invention. Fig. 10 is a block diagram of the control unit of the fatigue test apparatus of the fourth embodiment of the present invention. [Main component symbol description] 1 Fatigue test device 10 Device body 12 Servo motor 20 Servo amplifier 30 Control unit 31 Controller 33 A/D converter 38 200925598 35 Operation method 37 Disk drive (FDD) W Workpiece

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Claims (1)

200925598 VII. Patent application scope: 1. A fatigue testing device, which applies a reverse load on a workpiece by a servo motor, and has: a testing method, wherein the deformation speed of the workpiece is a specified waveform, and a reverse load is applied. a periodic change, and a reverse load is applied to the workpiece; a speed detecting means for detecting a deformation speed of the workpiece; and a control means for controlling the servo motor according to the detection result of the speed detecting means, and applying the servo motor to the workpiece When the cycle of the load is changed repeatedly, the ratio of the deformation speed of the workpiece to the specified speed is within a specified range regardless of the period during which the reverse load is applied. 2. The fatigue testing device according to claim 1, wherein the control means causes the servo horse to reach a rotation axis according to a ratio of a maximum value of the deformation speed measured in the specified period to the specified speed by the speed detecting means. The amplitude change is controlled. 3. For the fatigue test device of claim 1 of the patent scope, the specified range is between 0.95 and 1.05. 4. For the fatigue test device of claim 3, where the specified ❹ is within the range of 0.99 to 1.01. 5. The fatigue testing device of claim 1, wherein the fatigue testing device is a torsion testing device that applies a torsional load on the workpiece, and the deformation speed of the workpiece is at a specific position of the workpiece. The angular velocity around. 6. The fatigue testing device of claim 1, wherein the fatigue testing device applies a universal testing device for tensile, compressive or bending loads on the workpiece via a feed screw mechanism, and the deformation speed of the workpiece The speed at a specific position of the workpiece is in the feed direction component of the feed screw mechanism. 200925598 7. A fatigue testing device for applying a reverse load on a workpiece by a servo motor, and having: a test means for a deformation acceleration of the workpiece to a specified waveform, and causing a periodic change of the applied reverse load, Applying a reverse load to the workpiece; an acceleration detecting means for detecting a deformation acceleration of the workpiece; and a control means for controlling the servo motor according to the detection result of the acceleration detecting means, and applying a period of the repeated load to the workpiece © changing Regardless of the period during which the reverse load is applied, the ratio of the deformation acceleration of the workpiece to the specified acceleration is within a specified range. 8. The fatigue testing device according to claim 7, wherein the control means causes the rotation axis of the 祠-motor according to a ratio of a maximum value of the deformation acceleration measured by the speed detecting means during the specified period to the specified acceleration. The amplitude change is controlled. 9. The fatigue testing device of claim 7 of the patent application, wherein the specified range is between 0.95 and 1.05. 10. The fatigue testing device of claim 9 of the patent application, wherein the specified ❹ is within the range of 0.99 to 1.01. 11. The fatigue testing device of claim 7, wherein the fatigue testing device is a torsion testing device that applies a torsional load on the workpiece, and the deformation acceleration of the workpiece is at a specific position of the workpiece. The angular acceleration around. 12. The fatigue testing device of claim 7, wherein the fatigue testing device applies a universal testing device for tensile, compressive or bending loads on the workpiece via a feed screw mechanism, and the deformation acceleration of the workpiece At a specific position of the workpiece, the acceleration is in the feed direction component of the feed screw mechanism.