TWI600902B - Fatigue test method - Google Patents

Description

Fatigue test method

The invention relates to test methods, and in particular to a fatigue test method.

At present, hand tool products (such as screwdrivers and wrenches) usually need to pass the durability test and fatigue test before leaving the factory, so as to ensure that the hand tool products meet the product specifications.

However, the current fatigue test is to draw the torque of the object to be tested, so the design of the test machine is complicated and requires more computing time. The fatigue test process of such a test object usually takes 12 hours or even For a longer time. Among them, the Taiwan Patent Application No. 201031912 discloses a continuous testing device for a torque testing machine.

In view of the above-mentioned deficiencies, the fatigue testing method of the present invention controls the fatigue angle of the object to be tested by controlling the rotation angle of the object to be tested and monitoring the rotation of the object to be tested to a specific angle. The fatigue test can be completed continuously and automatically.

To achieve the above object, the fatigue testing method of the present invention comprises the steps of providing a testing machine including a testing device, a driving device and a control device. The control device is connected to the test device and the drive device, and controls the drive device to rotate; provides a test object, which is fixed on the drive device and abuts the test device; the control device has a target parameter; and the control device controls the drive device to drive the test object Performing an initial operation to cause the test device to generate a plurality of consecutive test results, each test result including a test parameter and a test angle; one of the test parameters of the test results is the same as the target parameter, and the control device is The test angle of the test result identical to the target parameter is defined as a first angle; and the control device controls the driving device to drive the object to be tested to perform multiple reciprocating operations according to the first angle, and each reciprocating operation causes the test device to generate an operating parameter. .

In order to achieve the above object, the present invention also provides a fatigue testing method, which is used for A test machine for testing a test object mounted on the test machine. The fatigue testing method comprises the following steps: the testing machine is provided with a target parameter; the testing machine performs a plurality of reciprocating operations at a first angle, each reciprocating operation causes the testing machine to generate an operating parameter; and the testing machine increases the angle mode. A subsequent reciprocating operation is performed to cause the operating parameters to track the target parameters.

Thus, the fatigue testing method of the present invention can continuously and automatically perform fatigue testing on the object to be tested, thereby effectively reducing the test time and ensuring that the object to be tested is subjected to fixed or similar parameters during the fatigue test.

Detailed steps, features, or modes of operation of the fatigue testing method provided by the present invention will be described in the detailed description of the subsequent embodiments. However, it should be understood by those of ordinary skill in the art that the present invention is not limited by the scope of the invention.

10‧‧‧Testing machine

11‧‧‧Testing device

13‧‧‧ drive

15‧‧‧Control device

20‧‧‧Test object

S31-S38‧‧‧Steps

Fig. 1 is a schematic view showing a test machine in which an object to be tested is mounted.

Figure 2 is a block flow diagram of the fatigue testing method of the present invention.

Figure 3 is a block flow diagram of the fatigue testing method of the present invention continuing from Figure 2.

Hereinafter, the steps, composition, and achievement of the fatigue test method of the present invention will be described with reference to the preferred embodiments of the drawings. The steps and the steps of the various figures are only used to illustrate the technical features of the present invention, and are not intended to limit the present invention.

As shown in FIG. 1 , the testing machine 10 is used to test a test object 20 and includes a testing device 11 , a driving device 13 and a control device 15 . The control device 15 connects the test device 11 and the drive device 13, and controls the drive device 13 to rotate.

The object to be tested 20 is fixed to the driving device 13 and abuts against the testing device 11. In this embodiment, the testing device 11 is a torsion sensor. Therefore, the testing device 11 can detect the torque applied by the driving device 13 on the object to be tested 20.

The operator can set a torque and a frequency to be tested by the control device 15 by using the control device 15. In this embodiment, the control device 15 can be a computer or other electronic device capable of setting test conditions.

When the rear end of the object to be tested 20 is fixed on the driving device 13, and the front end of the object to be tested 20 is abutted or inserted into the testing device 11, the control device 15 can perform fatigue testing on the object to be tested 20, and the fatigue test is also called For durability testing and strength testing.

As shown in Figure 2, the fatigue test method includes the following steps:

Step S31 is that the control device sets a target parameter. In this embodiment, the target parameter is a torque value.

Step S32 is that the control device controls the driving device to drive the object to be tested for an initial operation, so that the testing device generates a plurality of consecutive test results, each test result includes a test parameter and a test angle. In this embodiment, the test parameter Torque value.

One of the test parameters of the test results is the same as the target parameter, and step S33 is that the control device defines the angle of the test result equal to the target parameter as a first angle.

Next, in step S34, the control device controls the driving device to drive the object to be tested to perform a continuous reciprocating operation according to the first angle, and each reciprocating operation causes the testing device to generate an operating parameter. In this embodiment, the operating parameter is a torque value

Each reciprocating operation includes a going angle and a return angle, and the going angle is opposite to the return angle, and the absolute value is the same. That is to say, if the outward angle is 10 degrees, the return angle is minus 10 degrees. Therefore, after taking the absolute value, the values of both the outward and return paths are the same.

Although the forward and return angles of each reciprocating operation are the same in this embodiment, the running angle should be the same as the first angle in practice, but the return angle can be smaller than the outward angle, for example, the outward angle is 10 degrees. The return angle is minus 6 degrees. Therefore, the outward angle and the return angle are not limited to the same.

Thus, since the fatigue test method of the present invention can continuously perform the fatigue test on the object to be tested, and the drive device can accurately apply the predetermined torque (ie, the target parameter) to the object by the control angle, the fatigue of the present invention The test method can effectively and quickly test the test object to greatly shorten the test time of the test object.

In the previous embodiment, the entire process of the fatigue testing method of the present invention is illustrated, but during the testing, the driving device drives the object to be tested to continuously reciprocate at a first angle, and the control device may be reciprocated at a certain time. It was found that the operating parameters generated by the test device were less than The target parameter indicates that the torsion (ie, the operating parameter) generated by the test object to the test device is insufficient when the object to be tested is turned to the first angle. Therefore, the control device needs to fine tune the first angle so that the operating parameters are the same as the target parameters. Subsequently, the method of fine-tuning the first angle by the control device will be described.

As shown in Fig. 3, the figure is a block flow continuing from Fig. 2, that is, step S34 following Fig. 2. First, step S35 is a control device determining whether the operating parameter is equal to the target parameter. When the control device determines that the operating parameter is equal to the target parameter, the control device continuously controls the driving device to drive the object to be tested to continuously reciprocate according to the first angle, that is, returns to step S34. When the control device controls the driving device to drive the object to be tested to perform continuous reciprocating operation according to the first angle, and the operating parameter is smaller than the target parameter, that is, when the control device determines that the operating parameter is smaller than the target parameter, step S36 is to increase the first angle by the control device. Performing a subsequent reciprocating operation to cause the operating parameter to track the target parameter; then, in step S37, the control device defines the increased first angle as a second angle when the operating parameter is equal to the target parameter; and subsequently, step S38 is controlling The device controls the driving device to drive the object to be tested for subsequent reciprocating operation according to the second angle.

In this embodiment, the control device increases the first angle by accumulating a fixed angle. For example, for example, the first angle is 10 degrees and the target parameter is 5 Newton meters (Nm). When the operating parameter is less than the target parameter, the control device increases the first angle by 0.1 degrees, that is, completes a reciprocating operation at 10.1 degrees. However, the operating parameters generated by the reciprocating test device are still not consistent or equal to the target parameters. If the operating parameter is equal to the target parameter, the control device sets 10.1 degrees to the second angle. If the operating parameters do not match the target parameters, the control device increases the degree by 0.1 degrees in the next reciprocating operation, that is, the next reciprocating operation is completed at 10.2 degrees. Thus, the operation parameters are tracked by successively accumulating at a fixed angle of 0.1 degrees. Go to the target parameter.

In this embodiment, although 0.1 degree is used as the fixed angle, in practice, other angles may be used, and therefore it is not limited to 0.1 degrees. Furthermore, although in this embodiment, the target parameter is tracked by accumulating the first angle, in practice, the first angle may be directly increased in one reciprocating operation so that the operating parameter is the same as the target parameter, so that The second angle is directly performed in the next reciprocating operation. Therefore, the present invention is not limited to increasing the first angle in an additive manner.

It should be noted that the reciprocating operation mentioned in Figure 3 is the same as that mentioned in Figure 2. The reciprocating operation can be divided into the outward angle and the return angle, but the difference is that the reciprocating angle of the reciprocating operation of FIG. 2 is the same as the first angle. Therefore, the reciprocating return angle of the reciprocating operation of the figure can be smaller than the first angle. . However, the outward travel angle of the reciprocating operation of FIG. 2 is the same as the second angle, and therefore, the return angle of the reciprocating operation of the figure may be smaller than the second angle.

Although only the operation parameter generated by the test device is different from the target parameter and the method for fine-tuning the first angle corresponding to the control device is used in the embodiment, in practice, the control device controls the driving device to drive the object to be tested to rotate at the second angle. It may happen that the running parameter does not match the target parameter. Therefore, the target parameter can still be tracked by the method of fine-tuning the first angle, that is, fine-tuning the second angle (ie, obtaining another second angle). The device can effectively and quickly complete the fatigue test of the object to be tested.

Therefore, the fatigue testing method of the present invention can track target parameters in the dynamics of reciprocating operation to improve the testing efficiency and accuracy of the object to be tested.

Moreover, since the control device can dynamically finely adjust the rotation angle of the object to be tested, so that the torque applied to the object to be tested in the reciprocating operation can be close to or equal to the test target, the fatigue test method of the present invention can be continuous and The fatigue test of the entire test object is automatically completed.

In addition, although the testing device includes the testing device, the driving device, and the control device in this embodiment, in practice, the testing device may also be a component of other devices, and thus is not limited to the embodiment. In short, the testing machine of the present invention can perform the fatigue test of the object to be tested, as long as the target parameter can be set, and the object to be tested is reciprocated a plurality of times at an angle, and the target parameter can be tracked by increasing the angle. It is the fatigue test method of the present invention.

Finally, it is emphasized that the constituent elements disclosed in the foregoing embodiments are merely illustrative and are not intended to limit the scope of the present invention, and alternatives or variations of other equivalent elements should also be the scope of the patent application of the present application. Covered.

S31-S34‧‧‧Steps

Claims (9)

A fatigue testing method includes the following steps: providing a testing machine, including a testing device, a driving device and a control device, the control device connecting the testing device and the driving device, and controlling the driving device to rotate; providing a waiting The test object is fixed on the driving device and abuts against the testing device; the control device has a target parameter; the control device controls the driving device to drive the object to be tested for an initial operation, so that the testing device Generating a plurality of consecutive test results, each test result including a test parameter and a test angle; one of the test parameters of the test results is the same as the target parameter, and the control device is equal to the target parameter The test angle of the test result is defined as a first angle; and the control device controls the driving device to drive the object to be tested to perform multiple reciprocating operations according to the first angle, and each reciprocating operation causes the testing device to generate an operating parameter Wherein each reciprocating operation includes a going angle and a back angle, the going angle being the same as the first angle The return line is smaller than the angle angle go away. The fatigue testing method according to claim 1, wherein when the control device controls the driving device to drive the object to be tested to perform continuous reciprocating operation according to the first angle, and the operating parameter is smaller than the target parameter, The fatigue testing method further includes the following steps: the control device increases the first angle for subsequent reciprocating operation to cause the operating parameter to track the target parameter; and the control device increases when the operating parameter is equal to the target parameter The first angle is defined as a second angle; and the control device controls the driving device to drive the object to be tested to perform a subsequent reciprocating operation according to the second angle. The fatigue testing method of claim 2, wherein each reciprocating operation comprises a going angle and a back angle, the going angle being the same as the second angle, the back angle being less than the going angle. The fatigue testing method of claim 2, wherein the control device increases the first angle by accumulating a fixed angle. The fatigue testing method according to claim 1 or 2, wherein the target parameter, the test parameter and the operating parameter are respectively a torque value. A fatigue testing method is applied to a testing machine for testing a test object mounted on the testing machine, the fatigue testing method comprising the following steps: the testing machine is provided with a target parameter; the testing machine is to be tested The object performs multiple reciprocating operations at an angle, each reciprocating operation causes the testing machine to generate an operating parameter; and the testing machine performs a subsequent reciprocating operation by increasing the angle so that the operating parameter tracks the target parameter. The fatigue testing method of claim 6, wherein the testing machine increases the angle by adding a fixed angle. The fatigue testing method according to claim 6 or 7, wherein the target parameter and the operating parameter are respectively a torque value. The fatigue testing method according to claim 6 or 7, wherein each reciprocating operation comprises a going angle and a return angle, wherein the going angle is the same as the angle, and the return angle is smaller than the going angle.