KR20090124007A - Method for torque test - Google Patents

Abstract

PURPOSE: A torque testing method is provided to measure and compare the torque of both torque cells while a torque value applied in the both torque cells is kept regularly and to improve accuracy of measurement. CONSTITUTION: Torque of staircase type is applied in a slave torque cell(300) and a master torque cell(200). The torque value of the master torque cell and slave torque cell is compared. The staircase type is composed of a maintenance unit and a rising unit. The torque value of the master torque cell and slave torque cell is compared in the maintenance unit. A controller(190) controls a rotation angle of a servo motor(120). The rotation angle of the servo motor relates to a high level duration time per a unit time of a pulse signal applied in the servo motor. A repetition cycle of the pulse signal applied in the servo motor is uniform. The pulse signal applied in the duration of the maintenance unit has the high level duration time shorter than the pulse applied in the duration of the rising unit. The high level duration time of the pulse signal applied in the servo motor is uniform. The pulse signal applied in the duration of the maintenance unit has the repetition cycle longer than the pulse applied in the duration of the rising unit.

Description

Torque test method {Method for torque test}

The present invention relates to a torque test method, and more particularly, by applying a torque of the same magnitude to a master torque cell precisely calibrated by an authorized institution and a slave torque cell to be tested by using a servomotor to improve the accuracy of the slave torque cell. The present invention relates to a torque test method for determining, but improving the accuracy of the determination by applying a stepped torque.

Torque measuring device is used to measure the rotational force of the measuring object and is widely used in various fields such as measuring the rotational force of various machine tools and turbines or torque wrenches. To maintain the accuracy of the measurement, the torque tester is frequently used to test the accuracy. do.

In the test process of the torque meter, it is generally checked whether the torque value applied to the torque meter and the torque value measured by the torque meter have the same value while applying a predetermined torque to the torque meter. Therefore, the accurate test of the torque meter requires a method that can apply the correct value of torque to the torque meter.

The present invention is to solve the above problems, by using the servo motor to determine the accuracy of the slave torque cell by applying the same magnitude of torque to the master torque cell precisely calibrated in the authorized institution and the slave torque cell to be tested. However, the present invention relates to a torque test method capable of improving the accuracy of the determination by applying a stepped torque.

The torque test method of the present invention includes a table, a slave torque cell having one end detachably installed at the table and the other end gripped and fixed to a second coupling, and a third coupling connected to the second coupling. A master torque cell having one end gripped and fixed, a servo motor fixed to the support frame and connected to the other end of the master torque cell via a fourth coupling to provide torque, and a controller controlling the servo motor. In the torque test method using a tester, it is characterized in that the torque value of the slave torque cell and the master torque cell is compared while applying a stepped torque to the slave torque cell and the master torque cell.

The staircase is composed of a holding part and a rising part, and the holding part preferably compares torque values of the slave torque cell and the master torque cell.

The controller controls the rotation angle of the servo motor, wherein the rotation angle of the server motor is proportional to a high level duration per unit time of a pulse signal applied to the server motor.

The repetition period of the pulse signal applied to the servomotor is the same, but it is preferable that the pulse signal applied during the duration of the holding part is shorter in the high level duration than the pulse applied during the duration of the rising part.

However, the high level duration of the pulse signal applied to the servomotor is the same, but the pulse signal applied during the duration of the holding part may be formed so that the repetition period is longer than the pulse applied during the duration of the rising part.

In the torque test method of the present invention, the accuracy of the slave torque cell is determined by applying a torque to the master torque cell and the slave torque cell to be tested by using a servo motor, but by applying the torque in a step shape, both torque cells It is possible to improve the accuracy of the measurement by measuring and comparing the torque in both torque cells in a state that the torque value applied to the constant.

In the present invention, the torque is applied to the master torque cell 200 and the slave torque cell 300 by using the servo motor 120 and compared to the torque values measured in the master torque cell 200 and the slave torque cell 300. The slave torque cell 300 is calibrated. In this case, the master torque cell 200 refers to a torque cell in which the degree of distortion of the applied torque value is accurately corrected by an authorized institution, and the slave torque cell 300 refers to a target of a torque test such as a torque meter.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a configuration diagram of a torque tester used in the present invention, and FIG. 2 is a configuration diagram of a friction joint used in the torque tester.

As shown in FIG. 1, the torque tester 100 used in the present invention includes a table 180, a plurality of couplings 150, 151, 152 and 153, a bearing 170, a clutch 140, a reducer 130, The servo motor 120 and the controller 190 are included.

Table 180 is for fixing the slave torque cell 300, a plurality of inverted "T" shaped grooves are formed on the upper surface, and the slave torque cell 300 is fixed while the T-shaped nut is inserted into the groove. Let's go. However, the slave torque cell 300 may be fixed via the coupling 150 and the friction joint 160 which will be described later, depending on the shape thereof. In such a case, the couple disposed at the bottom of the coupling 150, 151, 152, 153. The ring 150 (hereinafter referred to as 'first coupling') is fixed to the upper surface of the table 180 by bolts, and the groove of the upper surface of the first coupling 150 is formed in the first friction joint 160. The hollow shaft part is inserted and installed, and the slave torque cell 300 is fixed by the first friction joint 160.

The table 180 may be configured to be liftable for convenience of fastening and detaching of the master torque cell 200, the slave torque cell 300, the couplings 150, 151, 152, 153, or the friction joints 160, 161, 162, 163.

Couplings 150, 151, 152, 153 are configured as conventional disk couplings as flexible couplings for automatically aligning the axis of torque tester 100. Here, the disc coupling is configured with the disc interposed between the upper body and the lower body and both the body, the upper and lower body can be inclined toward the disk side, the alignment of the axis center shifted by the restoring force of the bumper automatically Is a normal coupling.

As shown in FIG. 2, the friction joints 160, 161, 162 and 163 are generally hollow members, and a wrench groove is formed to which the wrench bolt 160b is fastened to one side of the body 160a having a substantially “T” shape. Through the thickness portion of the friction joint (160,161,162,163) is filled with a lubricant, such as a predetermined fluid, such as grease (grease). Therefore, when the wrench bolts 160b of the friction joint 160 are tightened, the grease in the friction joint 160 is compressed, and an expansion pressure acts on the inner surface of the friction joint 160, thereby causing the shafts of the torque cells 200 and 300 to be described later. It can be firmly gripped and fixed. That is, the lower shaft 302 of the slave torque cell 300 is gripped and fixed by the first friction joint 160, and the upper shaft 301 is the second friction joint configured on the lower surface of the second coupling 151. 161 is held and fixed.

Meanwhile, the shafts 201, 202, 301 and 302 of the master torque cell 200 and the slave torque cell 300 may be components of the torque cells 200 and 300, but may be adapters installed separately in the torque cells 200 and 300 for torque testing. In the following, the term "axis of torque cell" is referred to collectively.

The third coupling 152 is installed on the upper portion of the second coupling 151 via the bearing 170, and the third friction joint 162 is installed on the upper portion of the third coupling 152. do.

On the other hand, the second coupling 151 and the third coupling 152 respectively installed on the upper and lower sides of the bearing 170 is connected to be linked to the connecting shaft 172, the connecting shaft 172 is a bearing 170 Idling inside).

The lower shaft 202 of the master torque cell 200 is gripped and fixed to the third friction joint 162, and the upper shaft 201 is the fourth friction joint configured on the lower surface of the fourth coupling 153 located on the upper side. 163 is held and fixed. The upper part of the fourth coupling 153 is configured with a clutch 140 via a bearing 142.

The clutch 140 is to interrupt the power of the servo motor 120 to be described later, and when connected, the same torque is applied to the master torque cell 200 and the slave torque cell 300 by the operation of the servo motor 120. When shut off, the torque is released and restored to its original state.

The clutch 140 has a driving shaft 141 connected to the fourth coupling 153 so as to protrude from the lower portion thereof, and the driving shaft 141 is guided by the bearing 142. A servo motor 120 fixed to the support frame is installed at the upper portion of the clutch 140, and a reducer 130 for reducing the power of the motor 120 is installed at the lower portion of the servo motor 120. 130 is installed to interlock with the clutch 140.

Therefore, in the torque tester 100 according to the present invention, since the configuration from the servo motor 120 to the first coupling 150 or the slave torque cell 300 fixed to the table 180 is aligned in one axis, the servo The rotational force generated by the motor 120 is equally applied to the master torque cell 200 and the slave torque cell 300.

Hereinafter, a torque test method using the torque tester having the above configuration will be described in detail.

3 is a graph schematically showing torque values applied to torque cells 200 and 300 in a torque test process. As shown in FIG. 3, in the torque test process of the present invention, torque is applied to the torque cells 200 and 300 in a staircase form. That is, the torque value applied to the torque cells 200 and 300 is increased until the maximum torque value is reached, but the holding part 301 and the rising part 320 are repeated as many times as a preset number. However, as shown in FIG. 3, the torque may be applied in increasing decreasing order. Reference numeral 330 denotes a lowering part.

The torque is applied by the servo motor 120 as described above, and the controller 190 adjusts the torque values applied to the torque cells 200 and 300 by performing position control on the servo motor 120.

The control method of the servo motor 120 can be generally divided into speed control and position control. In this case, the position control is performed after grasping the rotation angle of the servo motor 120 with respect to the pulse signal applied to the servo motor 120. As a control method for adjusting the rotation angle of the servomotor 120 by adjusting the number or width of the signals, the servomotor 120 in the present invention is suitable for accurately applying the torque of the type shown in FIG. 3 to the torque cells 200 and 300. Position control is performed to adjust the rotation angle of the servomotor 120 to adjust the torque values applied to the torque cells 200 and 300. In this case, the pulse signal is generally in the form of a voltage.

The rotation angle of the servomotor 120 is generally increased in proportion to the high level duration per unit time of the pulse signal applied to the servomotor 120. Therefore, when the repetition period of the pulse signal is the same, as the high level duration in each period becomes longer, the rotation angle of the servomotor 120 is generally increased. However, the rotation angle of the servomotor 120 may be increased by increasing the number of pulses applied to the servomotor 120 per unit time while keeping the high level duration of each pulse constant.

The comparison between the torque values measured by the master torque cell 200 and the slave torque cell 300 is made by the holding unit 310 of FIG. 3. That is, as a result of applying a pulse signal (hereinafter referred to as 'drive pulse') to the servomotor 120 for a time corresponding to the rising part 320 as shown in FIG. 3, the torque values applied to the torque cells 200 and 300 are reduced. When the predetermined value is reached, the torque value of the master torque cell 200 and the slave torque cell 300 is measured using a torque sensor (not shown) while maintaining a constant torque value for a time corresponding to the holding part 310. Be prepared.

At this time, when the driving pulse is not applied to the servo motor 120, the servo motor 120 rotates in the opposite direction by the torque applied to the torque cells 200 and 300, so that the torque applied to the torque cells 200 and 300 is constant. I can't keep it. Accordingly, the pulse signal for preventing the servo motor 120 from rotating in the opposite direction even during the time corresponding to the holding part 310 and compensating for the error of the torque value generated as the servo motor 120 rotates in the opposite direction. (Hereinafter referred to as 'subpulse') should be applied to the servomotor 120.

In this case, the sub-pulse may have the same repetition period as the driving pulse as shown in FIG. 4, in which case, the high level duration is preferably shorter than the driving pulse. However, as shown in FIG. 5, the driving pulse and the sub pulse may have the same high level duration, but the repetition period of the sub pulse may be longer than the repetition period of the driving pulse.

6 illustrates a main window 400 of the controller 190. The controller 190 controls the operation of the torque tester 100 and presents data measured in the torque test process to the user.

The test setting area 401 sets the rotation direction, the test type, the maximum torque value, and the like of the servomotor 120. Specifically, the rotational direction of the servomotor 120 is selected from the forward direction (CW) or the reverse direction (CCW), and the maximum torque value (ex: 500.00 N / m), test frequency (ex: 1) and step to be applied to the torque cell are shown. You will enter (ex: 5).

The maximum torque value refers to the maximum torque value applied to the torque cells 200 and 300 in the torque test process, and the step is the number of steps in the case of applying the torque in the step shape as shown in FIG. 3, that is, the holding part 310. ) Means the number. At this time, when the user inputs the maximum torque value and the step, the torque value corresponding to the holding part 310 is automatically calculated.

In the master talk cell region 402 and the slave talk cell region 403, voltage values corresponding to torque values and torque values of the master torque cell 200 and the slave torque cell 300 are displayed. In this case, the voltage value means an output voltage of the torque sensor, and the torque value is a converted value obtained by multiplying the output voltage of the torque sensor by a predetermined function.

The difference region 404 means a difference between torque values in the master torque cell 200 and the slave torque cell 300. Therefore, the accuracy of the slave torque cell 300 is determined based on the torque value displayed in the difference region. In this case, when the test frequency is set to 2 or more in the test setting area 401, it is preferable to take an average of torque values and to compare the torque values of the master torque cell 200 and the slave torque cell 300.

The target torque cell area 405 is for determining the progress of the test process, and the torque value corresponding to the holding part 310 is displayed. That is, when the process starts, the target torque cell area 405 is first displayed with a torque value (ex: 100.00 N / m) corresponding to the first holding part 310, and the torque value of the master torque cell 200. When the torque value shown in the holding unit 310 is equal to the server motor 120 is stopped and the torque value of the slave torque cell 300 is measured in this state. Thereafter, the torque value of the target torque cell area is replaced with a torque value ex: 200.00 N / m corresponding to the second holding part 310, and this process is repeated a predetermined number of times.

The limit setting area 406 is for preventing the torque cells 200 and 300 from being damaged due to malfunction of the device during the test process. When the torque value applied to the torque cells 200 and 300 exceeds the preset limit value, the clutch is released. By separating, the torque is no longer applied to the torque cells 200 and 300.

Unlike the case of FIG. 3, the manual torque region 407 is for applying a torque of a predetermined value to the torque cells 200 and 300, and a user inputs a predetermined torque value through the manual torque region 407. When the move button is clicked, the servo motor 120 rotates so that the input torque value is applied to the torque cells 200 and 300.

1 is a block diagram of a torque tester (torque tester) used in the present invention.

2 is a configuration diagram of a friction joint used in the torque tester.

3 is a graph schematically showing a torque value applied to a torque cell.

4 is a conceptual diagram showing a relationship between a driving pulse and a subpulse.

5 is a conceptual diagram showing a relationship between a driving pulse and a subpulse.

6 is a main window of a control unit;

<Brief description of the major symbols in the drawings>

100: torque corrector 111: rail

120: servomotor 130: reducer 140: clutch 141: drive shaft 142: bearing 150,151,152,153: coupling 160,161,162,163: friction joint 160a: body

160b: Wrench Bolt 170: Bearing 180: Table 190: Control Unit

200: master torque cell 201,202: axis

300: slave torque cell 301,302: axis

310: holding part 320: rising part

330: descent 400: main window

401: Test setting area 402: Master torque cell area 403: Slave torque cell area 404: difference area

405: target torque cell area 406: limit setting area

407: manual torque area

Claims (5)

Table, one end thereof is detachably installed on the table, the other end is a slave torque cell gripped and fixed to the second coupling, the master end is gripped and fixed to the third coupling coupled to the second coupling A torque test method using a torque tester comprising a torque cell, a servo motor fixed to the support frame and connected to the other end of a master torque cell via a fourth coupling to provide torque, and a controller controlling the servo motor. , Torque test method, characterized in that for comparing the torque value of the slave torque cell and the master torque cell while applying a step-shaped torque to the slave torque cell and the master torque cell. The method of claim 1, The staircase form includes a holding part and a rising part, and the holding part compares torque values of the slave torque cell and the master torque cell. The method according to claim 1 or 2, The controller controls the rotation angle of the servo motor, wherein the rotation angle of the server motor is proportional to the high level duration per unit time of the pulse signal applied to the server motor. The method of claim 3, wherein The repetition period of the pulse signal applied to the servomotor is the same, but the pulse signal applied during the duration of the holding portion is a high level duration shorter than the pulse applied during the duration of the rising portion of the torque test method. The method of claim 3, wherein The high level duration of the pulse signal applied to the servomotor is the same, but the pulse signal applied during the duration of the holding portion is a torque test method characterized in that the repetition period is longer than the pulse applied during the duration of the rising portion.

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