JP3499432B2 - Material testing machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamometer for controlling the operation of a tester body for applying a load to a test piece to test the material characteristics of the test piece, efficiently and efficiently from a data processing device. The present invention relates to a material testing machine that can give a control command accurately.

[0002]

2. Related Background Art Generally, a material testing machine has a testing machine body 10 for applying a load such as a load or a displacement to a specimen and an operation of the testing machine body 10 as shown in the schematic configuration of FIG. Dynamometer 20 for controlling the load and displacement of the specimen under control of the load, and the material characteristics of the specimen according to the data consisting of the load and the displacement detected by the dynamometer 20. And a data processing device 30.

Specifically, the tester main body 10 uses a load device 11 such as a hydraulic cylinder on a test piece such as a piece of metal material mounted on a pair of chucks (not shown) to compress or load it. Alternatively, it is configured to apply a load consisting of compressive displacement and tensile displacement. Incidentally, not only compression and tension but also load such as bending and strain may be applied. Then, the dynamometer 20 includes the load device 11 of the tester body 10.
And a control unit 21 for controlling the operation of the load meter (load cell) 1 incorporated in the tester body 10.
2, between the displacement unit (extension meter) 13, the strain gauge 14, and the like, the measuring unit 22 that measures the load, the displacement, and the strain applied to the sample, and the data processing device 30. It is configured to include a communication unit 23 that executes communication.

On the other hand, the data processing device 30 is
The dynamometer 2 comprises a personal computer, for example.
Data composed of the load and displacement detected at 0 is fetched at a predetermined cycle, and the data is processed. With this data processing device 30, the load of the specimen is
Elongation characteristics, stress / strain characteristics, and further material characteristics such as strength are required. Recently, the data processing device 30
Therefore, an instruction such as a test start is given to the dynamometer 20 while communicating control commands and the like with the dynamometer 20 under a predetermined control program.

[0005]

By the way, recently, it has been attempted to set the test conditions for the dynamometer 20 from the data processing device 30. The control command in this case is, for example, as shown in FIG. 6, [(constant speed) load test], [(constant speed) displacement test], [(constant speed) strain test], [JIS tensile test],
A control command to selectively specify the test conditions as [Concrete test], an operation mode consisting of [Manual] and [Automatic] and a test consisting of [Start], [Stop], [Hold] and [Return]. It is given as a control command to control and a control command to specify measurement conditions such as [load range] and [strain gauge removal].

That is, when performing a material test, the test forms are roughly classified according to how the load applied to the specimen is managed (type of control). Therefore, the test conditions are load control, displacement control, and strain. In addition to specifying by classifying into control, J
The control command is prepared as described above so as to specify the IS tensile test and the special test concrete test separately. Then, the data processing device 30 controls the execution of the test by selectively giving these control commands to the dynamometer 20 together with data (load speed, stress speed, etc.) designating the execution condition of the test. It has become a thing. Incidentally, the control commands and command data are expressed as a series of numerical data composed of ASCII code. Further, the communication formats of these control commands are fixedly assigned to their data areas and the like so that the communication can be easily realized by a predetermined communication protocol.

However, there are various test methods for the specimen using the material testing machine, and the embodiment of the test is also changed depending on the purpose of the test. For example, when applying a compressive load as a load to a test piece, generally, the load is often increased at a constant speed, and the 雖 also repeatedly and repeatedly applies a load (cycle test), or at a predetermined cycle. The material properties are tested by applying a load intermittently (interval test). In the case of such a special test form, since the control command is limited as described above, the data processing device 30 cannot instruct the command. Therefore, the test conditions are set locally by the dynamometer 20 exclusively.

In such a case, the data processing device 30 cannot accurately grasp the state of the material test being executed in the tester body 10, so that, for example, the test conditions and device conditions can be stably and The problem arises that it will be difficult to collect reliably. Therefore, it is conceivable to realize the above-described cycle test or interval test by making full use of the control command and giving a control command for instructing load control, for example, to the dynamometer 20 at regular intervals. However, not only does the number of times of communication between the dynamometer 20 and the data processing device 30 increase, but also data already communicated is repeatedly communicated each time, so there is much waste of communication. It cannot be denied that the processing load on the processing device 30 becomes enormous.

The present invention has been made in consideration of such circumstances, and an object thereof is to realize efficient data communication between a data processing device and a dynamometer to thereby achieve a processing load in the data processing device. It is an object of the present invention to provide a material testing machine capable of reducing the above-mentioned problems, accurately setting test conditions for the dynamometer, and stabilizing the material test and improving reliability.

[0010]

In order to achieve the above-mentioned object, the present invention provides a tester main body for applying a load to a test piece, and a tester main body for controlling the operation of the tester main body and applying a load. A material comprising a dynamometer for detecting a load and a displacement, and a data processing device for setting a test condition for the dynamometer and determining a material characteristic of the specimen according to the load and the displacement detected by the dynamometer. With regard to a testing machine, particularly in the data processing device, for example, control types classified as load control, displacement control, and strain control, and, on the other hand, tests classified as constant speed load test, cycle load test, and interval load test. The first control command group that is individually set for each of a plurality of test modes in which the test conditions for the sample are finely classified according to the type of Using the second control command group for controlling the line is characterized in that it has to give a control command to the power meter.

That is, a control command (first control command group) according to a plurality of test modes subdivided according to various test conditions, and a control command capable of instructing execution of the test at a fine control level ( By using the second control command group), it is possible to give an accurate command to the dynamometer at an appropriate timing without increasing the amount of communication data or the processing load on the data processing device. It is characterized by that.

More specifically, as described in claim 2, the test conditions for the specimen are classified into a constant speed load test, a cycle load test and an interval load test according to the type of the test, and each test further load control according to the type of the control, three test modes classified into displacement control and nine test modes reclassified respectively distortion control, also compression tested concrete test, bending test and tensile test , And the JIS tensile test are finely classified as test modes, and the first control command group is constructed as 13 kinds of control commands for individually designating each of these test modes.

[0013] In the data processing apparatus, in accordance with the content of the control command specified by the control command, and the format of communication data communicated between said dynamometer, control data specified by the format It is characterized in that data communication is performed by changing the contents of the area. In other words, the format of communication data is changed according to the test condition specified by the control command, and the communication content is changed so that only the information necessary for executing the test is properly given, thereby saving waste. The feature is that it realizes the previously described data communication.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a control command given to a dynamometer 20 from a material testing machine according to an embodiment of the present invention, particularly a data processing device 30, will be described with reference to the drawings. The material testing machine according to this embodiment is basically the same as that shown in FIG.
As described above with reference to FIG.
0, and a data processing device 30. Therefore, in the dynamometer 20, according to the test conditions set on the operation panel (not shown) and the control information given from the data processing device 30, the tester main body 1
While controlling the operation of 0 and applying a predetermined load to the sample (not shown), the load, displacement and strain applied to the sample are sampled and detected at a predetermined cycle. At this time, dynamometer 20
At the same time, the operating states and the like of the respective parts in the tester main body 10 are monitored at the same time, and information indicating these operating states and the like is collected for each preset status item.

The feature of the present invention is that the test conditions executed in the tester main body 10 under the control of the dynamometer 20 depend on the type of test as shown in the concept of FIG. It is classified into a constant speed load test V, a cycle load test C, and an interval load test I, and is further roughly classified into five, which are a JIS tensile test J and a concrete test C which is a special test form. Paying attention to being classified into load control P, displacement control L, and strain control S according to the type, the control command is defined for each of these test conditions.

Specifically, in the material testing machine according to this embodiment, the constant speed load test V is subdivided into a constant speed load test Pv, a constant speed displacement test Lv, and a constant speed strain test Sv. Similarly, cycle load test C is replaced by cycle load test P
c, cycle displacement test Lc, and cycle strain test S
The interval load test I is subdivided into c, and the interval load test I and the interval displacement test L
It is subdivided into i and interval strain test Si. And JIS tensile test J is applied to each of these test modes.
And the concrete test C is a concrete compression test C
p, concrete bending test Cr, and concrete tensile test Ct, and a test mode subdivided into a total of 1
The test conditions are subdivided into three types of test modes.

The first control command group for designating each of these subdivided test conditions is set as a control command for individually designating each of the test modes. By the way, each control command is given as a sequence of ASCII codes consisting of, for example, 3 bytes [A01], [A02],
Is used for data communication as code data of [A13].

In addition to the first control command group as described above, in this material testing machine, control commands for requesting test conditions from the dynamometer 20 to the data processing device 30, device conditions, and measured values are A control command for sending is prepared. Further, instead of the operation for performing the test on the operation panel of the dynamometer 20, as a second control command group for remotely controlling this from the data processing device 30, manual, automatic, test start, test Control commands consisting of hold, test stop, ram home return, displacement hold, auto setup, measurement start, measurement stop, load auto zero, load auto range, etc. are defined to enable fine control of the test execution process. . These control commands are used for data communication as code data [A14], [A15], to [A28] given as a sequence of ASCII codes, for example.

However, each of the control commands [A01], [A
02] to [A28] are data (information) necessary for executing the material test in the test mode specified by the control command, as shown in the message format in FIG.
At the same time, communication is performed in a format according to the type of the control command. Particularly, the first control command group is specific to basic test condition data such as load range, cross-sectional area, rupture condition, initial valve opening, etc., and to each test mode such as test speed and automatic hold as shown in FIG. It is adapted to be used for communication between the data processing device 30 and the dynamometer 20 as communication data in a format including various test condition data.

The communication format of the control command will be briefly described below. The communication data for setting the test conditions includes 3-byte command data, several bytes of control data, and 1-byte load as shown in FIG. It has a format composed of range data, 5-byte cross-sectional area data, 3-byte breaking condition data, and 2-byte initial valve opening data.

However, the command data has the above-mentioned [A
01], [A02], to [A13], which is selectively given as a command code, and the type (content) of control data and the number of bytes for communicating the control data according to the command code. Is set. In addition, the load range data is ASCII code [1], which specifies the magnification.
It is given as [2], ～ [6], and the magnification is
It is selectively set as [x1], [x2], [x5], [x10], [x20], [x50]. Further, the cross-sectional area data is the numerical data up to the first digit of the decimal point whose unit is [mm ² ], and the fracture condition data is the numerical data up to the first digit of the decimal point whose unit is [max%], and the initial valve. The opening data is given as two-digit numerical data whose unit is [%]. However, in the case of a concrete test, the unit of the cross-sectional area data is given as [cm ² ].

Incidentally, the control data corresponding to the command code is given as test speed data and automatic hold condition data in the case of a constant speed load test.
However, in the case of the cycle load test, data defining upper and lower limits and data on the number of repetitions are given instead of the automatic hold conditions. When performing strain control, in addition to the above control data, data regarding the full scale of the extensometer and data regarding the gauge length are given. Further, in the case of the above-mentioned JIS tensile test, data of stress velocity, displacement velocity and stress point are given as the control data. In this way, the dynamometer 20
And the control data communicated between the data processing device 30 and
Depending on the test condition specified by the control command, only the one necessary for executing the test is given, and the allocated byte number is changed depending on the data amount, and the communication format is variable. Is set to.

On the other hand, as shown in FIG. 4, the communication data concerning the equipment condition communicated from the dynamometer 20 to the data processing device 30 is 1-byte unit system data, 7-byte tester weighing data, It consists of 1-byte load range data, 2-byte extensometer measurement range data, and 1-byte extensometer range data. The above unit system data is
Whether material testing was performed under the MKS unit system, or S
It is made up of identification data indicating whether or not it was executed under the I unit system, and the weighing data is made up of 7-digit numerical data whose unit is [kgf] or [N]. Further, the load range data is composed of an ASCII code for specifying the load range as described above, and the extension meter range data is composed of a code for designating whether the magnification is [× 1] or [× 4].
Further, the unit of the extensometer measurement range data is [mm] 3
It is given as digit data.

The above-mentioned manual, automatic, test start,
Each control command belonging to the second control command group consisting of test hold, test stop, ram origin return, displacement hold, auto setup, measurement start, measurement stop, load auto zero, load auto range, etc., has its code [A1
6], [A17], to [A28] are provided as a communication format from the data processing device 30 to the dynamometer 20. With such a control command (code), a control command as if the operation panel (not shown) of the dynamometer 20 was directly operated is remotely given from the data processing device 30.

Thus, according to the data processing device 30 for performing data communication with the dynamometer 20 under the control command systematized as described above and the communication format set according to each control command, The test conditions of the material test performed in the main body 10 can be easily set for each test mode that is finely classified by the test type and the control type as described above. Moreover, all of the control data required to carry out the test can be given in a lump using the communication format as described above. Therefore 1
The test condition can be set easily and surely by only one data communication.

After setting the test conditions, the execution of the material test can be sequentially specified using the second control command group. Moreover, an operation command can be given easily and reliably by simply communicating the control command (code). Therefore, as compared with the conventional case where data communication is performed with the dynamometer 20 under a fixed communication format, unnecessary data (unnecessary data) is not communicated, so The amount of communication data can be significantly reduced.

Particularly, the above-mentioned setting of the test conditions is performed only once before the start of the material test,
Even if the communication format related to the first control command group is long and the communication data amount is large, the data processing device 30 does not have a heavy processing load. Rather, it can be said that the processing load can be reduced as compared with the conventional case where data communication is repeatedly performed using limited control commands for setting test conditions. Also, since the communication load is small and only the necessary data can be communicated at the required timing, it is possible to carry out a stable material test while accurately grasping the entire test status, improving the operational reliability. It is possible to achieve such effects.

The present invention is not limited to the above embodiment. For example, it is of course possible to increase the number of control commands for setting the test conditions, and it is also possible to increase the number of commands for controlling the execution of the test in accordance with the specifications of the operation panel of the dynamometer 20. . Further, regarding the communication format set according to the control command, it goes without saying that the data length or the like may be changed according to the required measurement accuracy or the like. In addition, the present invention can be variously modified and implemented without departing from the scope of the invention.

[0029]

As described above, according to the present invention, types of tests classified as, for example, a constant speed load test, a cycle load test, and an interval load test, and load control, displacement control, and strain control are classified. The first control command group corresponding to a plurality of test modes in which the test conditions for the test piece are finely classified according to the type of control, and the second control command group for controlling the execution of the test for the test piece are used. Since the control command is given to the dynamometer, the test conditions can be easily and accurately set at appropriate timing for the dynamometer without increasing the communication data amount and the processing load on the data processing device. Instructions regarding test execution can be given.

In particular, the format of communication data communicated with the dynamometer and the content of the control data area specified by the format are changed according to the content of the control command specified by the control command. Since data communication is performed, wasteful data communication can be realized, the communication load can be reduced, and the operation reliability can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a relationship between a classification system of test conditions and a control command in a material testing machine according to an embodiment of the present invention.

FIG. 2 is a diagram showing types of control commands in the material testing machine according to the embodiment of the present invention, and a message format defined for each control command.

FIG. 3 is a diagram showing a communication format of a first control command for setting a test condition.

FIG. 4 is a diagram showing a communication format of a control command indicating a device condition.

FIG. 5 is a diagram showing a schematic configuration of a material testing machine.

FIG. 6 is a diagram showing a conventional general format type of communication data communicated from a dynamometer to a data processing device.

[Explanation of symbols]

10 Testing machine body 20 dynamometer 30 data processor Pv constant speed load test Lv constant velocity displacement test Sv constant speed strain test Pc cycle load test Lc cycle displacement test Sc cycle strain test Pi interval load test Li interval displacement test Si interval strain test J JIS tensile test Cp concrete compression test Cr concrete bending test Ct concrete tensile test

Continuation of the front page (56) Reference JP 63-153700 (JP, A) JP 60-100202 (JP, A) JP 54-67455 (JP, A) JP 9-43125 (JP , A) JP-A-8-184541 (JP, A) JP-A-8-178607 (JP, A) JP-A-3-170840 (JP, A) Actual development Sho-63-109636 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01N 3/00-3/62 JISST file (JOIS)

Claims (2)

(57) [Claims] 1. A tester main body for applying a load to a test piece, a dynamometer for controlling the operation of the tester main body and detecting the load and displacement of the test piece under load, and the dynamometer setting the test conditions consist said specimen data processing apparatus for determining the material properties of accordance and both displacement and the load detected by the animal forces meter, said data processing apparatus, a type of classification and testing advance control A control for setting test conditions to be given to the dynamometer using a first control command group for individually setting a plurality of test modes classified according to the above, and a second control command group for controlling execution of a test on the test piece. Format of communication data for communication between command setting means and the dynamometer
And the control data area specified by the format
The contents of the control command specified by the control command
Change according to the contents and set by the control command setting means.
And a data communication means for applying the specified test conditions to the dynamometer . Wherein said first control command group, the constant speed test is classified by the type of test on the specimen, the cycle test and interval testing, load test to be classified by the type of each control, the displacement test and Distortion test
Nine test modes reclassified every three species classified in compression test, bending test and tensile test concrete test
The material testing machine according to claim 1, wherein the material testing machine is provided as a total of 13 kinds of control commands for individually setting each of the test modes of the same class and the test mode for designating the JIS tensile test.