JP4325142B2 - Press machine test method, test system, test program, and test program recording medium - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a test method, a test system, and a test apparatus, a test program, and a test program recording medium used for examining the performance of a press machine.
[0002]
[Prior art]
It is important to know the performance of the press machine quantitatively in order to carry out the press work stably and accurately. Among the performances of press machines, the position accuracy of bottom dead center (hereinafter referred to as bottom dead center accuracy) is the most important because it affects the accuracy of the workpiece. The press machine becomes loose as you use it, and the accuracy of the bottom dead center becomes worse.
In particular, when a company that is not a manufacturer of a press machine develops or manufactures a press machine, it cannot be used until the performance of the press machine is examined.
Conventionally, no proposal has been made regarding performance tests of such press machines.
[0003]
[Problems to be solved by the invention]
As for the performance of the press machine, if the durability test is performed, the state of the change in the performance can be known. In the durability test, it is important to examine changes in the bottom dead center during pressing or changes in the maximum load.
In addition, the test needs to be performed while applying a predetermined load to the press machine, and for that purpose, a test apparatus equipped with a sensor means capable of detecting the displacement and load load of the press machine is required.
Furthermore, it is desirable to allow automatic testing because the testing of the press machine is very long. In that case, it is desired that measurement data collection, processing, determination, etc., control of the press machine, etc. be executed on software.
[0004]
Accordingly, an object of the present invention is to provide a test method and a test system for quantitatively examining the performance of a press machine.
Another object of the present invention is to provide a test apparatus suitable for testing a press machine.
Still another object of the present invention is to provide a test program and its recording medium for automatically performing a test of a press machine.
[0005]
[Means for Solving the Problems]
  In the testing method for a press machine according to the present invention, the test device for the press machine generates a load provided between an upper pressurizing unit, a lower sensor mounting unit, and the pressurizing unit and the sensor mounting unit. A transmission unit, a load sensor that detects a load from the pressure unit through the load generation / transmission unit, and a displacement sensor that detects a distance between the pressure unit and the sensor mounting unit. ,
  Setting the test apparatus in the press machine and measuring the bottom dead center position and / or the maximum load of the load when the press machine is operated;
  A second section is set in the first section divided by a predetermined cycle number unit, and bottom dead center data and / or maximum load data in the second section is set for each first section. The process of accumulating;
  The accumulated bottom dead center data and / or maximum load dataPreset valuesBy comparing withAnd determining the bottom dead center position and / or the maximum load.
[0006]
In the test method for a press machine according to the present invention, a durability test can be performed while applying a load to the press machine by a test apparatus. At that time, the bottom dead center position and / or the maximum load of the load is measured, and the measurement is performed. By examining how many times or how long the value is within the set value range, it is possible to quantitatively know the durability of the press machine, that is, the use limit.
[0010]
The test method for a press machine according to the present invention searches for position data representing a minimum value from a group of position data obtained by measuring with a displacement sensor in one cycle of the operation of the press machine, and dies the position data. This is point data.
Since the displacement of the press machine (stroke position of the ram) changes with time, position data representing the minimum value can be searched from the measurement data of each point in one cycle, and the position data can be determined as the bottom dead center. . This method is possible by obtaining a method described below or a displacement curve.
[0011]
The test method for a press machine according to the present invention searches for load data representing the maximum value from a group of load data obtained by measuring with a load sensor in one cycle of operation of the press machine, and uses the load data as the maximum load. Data.
The maximum load can be obtained in the same manner.
[0012]
The test method for a press machine according to the present invention measures the displacement of the press machine at every sampling period in the one cycle. When the current position data is smaller than the smallest position data in the past, the current position data is reduced. Replaced as dead point data, and when the current position data is larger than the past smallest position data, the current position data is ignored and the already replaced bottom dead center data is determined as the bottom dead center position. It is.
Since the displacement curve of the press machine approximates the sin curve, the position of the bottom dead center can be determined by sequentially comparing the position data of the current measurement point and the position data of the past measurement point. it can.
[0013]
The test method of the press machine of the present invention measures the load of the press machine at every sampling period in the one cycle, and when the current load data is larger than the largest load data in the past, the current load data is When the maximum load data is replaced and the current load data is smaller than the largest load data in the past, the maximum load data that has already been replaced is determined as the maximum load by ignoring the current load data.
Since the load curve is similar to a convex parabola, trapezoid or triangle, the maximum load can be determined in the same manner.
[0014]
  In the testing method for a press machine according to the present invention, a second section is set in a first section divided by a predetermined number of cycles, and a bottom dead center in the second section is set for each first section. dataAnd / or accumulate maximum load dataIs.
[0015]
  The test system for a press machine according to the present invention includes an upper pressurizing unit, a lower sensor mounting unit, a load generating / transmitting unit provided between the pressurizing unit and the sensor mounting unit, and the pressurizing unit. A movable part of a press machine, comprising: a load sensor that detects a load from the pressure part via the load generation / transmission part; and a displacement sensor that detects a distance between the pressure part and the sensor mounting part. And a test apparatus attached to the fixed part, and a computer incorporating a test program,
  The test program isThe second section can be set in the first section divided by the number of cycles of the press machine, and the bottom dead center data in the second section for each first section, and / or The ability to accumulate maximum load data;
  Ability to evaluate the bottom dead center position and / or the maximum load of a press machine testWhenIt is characterized by having.
  By using such a test apparatus and a computer in which a test program is incorporated, a durability test of the press machine can be automatically performed, and the performance can be automatically checked.
[0020]
  In the press machine test system of the present invention, the test program includes:For each cycle of the operation of the press machine, position data is sequentially read from the displacement sensor at a fixed timing, and the current position data is compared with the smallest position data in the past. Replaced with bottom dead center data, and ignores the current position data when it is large.And / or for each cycle of the operation of the press machine, the load data is sequentially read from the load sensor at a fixed timing, and the current load data is compared with the largest load data in the past to obtain current load data. When the load data is large, it is replaced with the maximum load data, and when the current load data is small, the maximum load data is ignored.
[0022]
The second section is set in the first section divided in units of a predetermined number of cycles, and the bottom dead center data in the second section is accumulated for each first section.
[0023]
The second section is set in the first section divided in units of a predetermined number of cycles, and the maximum load data in the second section is stored for each first section.
[0024]
A function of setting the second section as an initial stage of the first section;
[0027]
The load generation / transmission unit further includes guide means for the sensor mounting unit.
The load generating / transmitting portion can be kept horizontal (parallel) by the guide means, and the elastic body load can be smoothly transmitted to the load sensor.
[0042]
  The test program for a press machine according to the present invention has a function for causing a computer to sequentially read position data from a displacement sensor at a fixed timing for each cycle of operation of the press machine, and the current position data and the smallest in the past. A function that compares the position data with the bottom dead center data when the current position data is small, and ignores it when the current position data is large. When,A second section can be set in the first section divided by the number of cycles of the press machine, and a function of accumulating bottom dead center data in the second section for each first section; ,And a function of determining whether or not the bottom dead center position is within a preset set value range.
[0043]
  The press machine test program according to the present invention includes a function for causing a computer to sequentially read load data at a constant timing from a load sensor for each cycle of the operation of the press machine, a current load data, and a past When the current load data is large when compared with the largest load data, it is replaced with the maximum load data.smallWhen ignoring it, the function to determine the maximum load of the press machine,A second section can be set in the first section divided in units of the number of cycles of the press machine, and a function of storing the maximum load data in the second section for each of the first sections;And a function of determining whether or not the maximum load is within a preset set value range.
[0044]
According to the press machine test program of the present invention, the press machine can be automatically tested using software, and the most important bottom dead center accuracy and maximum load accuracy in the performance of the press machine can be efficiently used. I can investigate well.
[0045]
The test program for a press machine of the present invention has the following features.
[0048]
The first section and the second section divided by the number of cycles of the press machine can be set, and a function of accumulating bottom dead center data in the second section for each first section This is realized by the computer.
[0049]
The first section and the second section divided by the number of cycles of the press machine can be set, and the function of storing the maximum load data in the second section for each of the first sections It is realized by a computer.
[0050]
The computer is caused to realize a function of setting the second section to the initial stage of the first section.
[0053]
  In addition, a test program recording medium for a press machine according to the present invention includes:aboveThe press machine test program according to any one of the above is recorded in a computer in a readable manner.
  Therefore, it is possible to easily provide test software suitable for testing any press machine.
[0054]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional front view of a test apparatus for a press machine according to the present invention, FIG. 2 is a cross-sectional side view of the test apparatus and a configuration diagram of a test system for a press machine using the test apparatus, and FIG. 3 is a perspective view of the test apparatus. FIG. 4 is a front view showing the mounting portion of the displacement sensor.
[0055]
In this embodiment, a test apparatus 10 for performing a test of a press machine is attached between an upper movable part 101 and a lower fixed part 102 of the press machine. The test apparatus 10 has a configuration in which a part constituting the apparatus main body has a form like a mold and can be handled like a mold. That is, it is roughly divided into two upper and lower parts, and the upper part is a pressurizing part 11 fixed to the movable part 101 of the press machine. The lower portion includes an intermediate portion 12 and a pedestal portion 13, and the pedestal portion 13 as a sensor mounting portion is fixed to a fixing portion 102 of a press machine. The intermediate portion 12 is a load generating / transmitting portion, and is slidably mounted on the pedestal portion 13 so that the generated load load is directly and smoothly transmitted to the load detecting portion of the pedestal portion 13. It has become.
[0056]
The pressurizing unit 11 includes two plate members. The upper plate 111 is integrally fixed to the upper plate 112 with bolts 113, and the upper plate 112 is movable with the bolt 114 through the upper plate 111. It is fixed to the part 101. Of course, these upper plates 111 and 112 do not have to be separate bodies as described above, and the pressurizing unit 11 may be formed as a single unit.
[0057]
The intermediate load generation / transmission unit 12 is provided with an elastic body 14 for setting a virtual machining load and a guide means 15 for the base unit 13 so as to keep the load generation / transmission unit 12 horizontal (parallel). It is installed. The guide means 15 includes positioning posts 16 disposed at four corners of the load generating / transmitting portion 12 and fitting holes 17 of the positioning posts 16 provided on the pedestal portion 13. The positioning posts 16 and the fitting holes 17 may be disposed in the reverse order of the illustrated ones.
[0058]
A load sensor 18 for detecting a load applied to the elastic body 14 and a displacement sensor 19 for detecting the displacement of the pressurizing unit 11 are disposed on the pedestal portion, that is, the sensor mounting portion 13. Each of the load generation / transmission unit 12 and the pedestal unit 13 is also composed of two plate members. In the load generation / transmission unit 12, the intermediate plate 121 and the intermediate plate 122 are fixed by bolts 125. In the pedestal unit 13, the lower plate 132 is fixed to the fixing unit 102 of the press machine by the bolts 135 via the lower plate 131. ing. Of course, the middle plates 121 and 122 and the lower plates 131 and 132 can also be formed as a single unit as described above.
[0059]
The load generating / transmitting unit 12 transmits the load of the elastic body 14 generated by being pressed by the upper pressing unit 11 directly and smoothly to the load sensor 18 attached to the lower pedestal unit 13. Yes. In this example, a spring is used for the elastic body 14, but a synthetic rubber (for example, urethane rubber, silicon rubber, etc.), a spring using fluid pressure, or the like can also be used. One or a plurality of elastic bodies 14 are provided and are equally arranged in the test apparatus 10.
[0060]
The elastic body 14 is provided so as to be compressed by being pressed by the upper pressure unit 11. Therefore, the elastic body 14 is inserted into the hole 123 so that the upper end portion protrudes upward from the middle plate 121 of the load generating / transmitting portion 12. A shaft 20 is erected coaxially inside the hole 123, and the elastic body 14 is inserted so that the shaft 20 enters the elastic body 14. The elastic body 14 can set a virtual machining load assuming any mold. Moreover, since the elastic body 14 is inserted in the shaft 20, even if a load is applied, it does not twist or shift. Further, by inserting a spacer 21 as a height adjusting plate under the elastic body 14 and finely adjusting the height of the elastic body 14 by the thickness of the spacer 21, the load of the elastic body 14 can be finely adjusted.
[0061]
The load generating / transmitting portion 12 is positioned with respect to the pedestal portion 13 by a positioning post 16 of the guide means 15 and a fitting hole 17 into which the positioning post 16 is fitted, and is slidably guided in the vertical direction. It is like that. That is, the load sensor 18 is brought into contact with the lower surface of the middle plate 122 and the load generating / transmitting unit 12 is slightly lifted from the pedestal unit 13 (a slight gap is provided between the middle plate 122 and the lower plate 132). The load generation / transmission unit 12 is supported. Such a guide means 15 holds the load generating / transmitting portion 12 horizontally (parallel) so that the load of the elastic body 14 is accurately transmitted to the load sensor 18. Reference numeral 126 denotes a bolt for fixing the positioning post 16.
[0062]
The load sensor 18 is attached to the center of the test apparatus 10 (the center of the press machine). For example, a load cell, a strain gauge, a piezoelectric element, or the like can be used as the load sensor 18. The load sensor 18 is supported by a height adjustment plate 22, and the height of the load sensor 18 can be finely adjusted by the thickness of the height adjustment plate 22. Further, the height adjusting plate 22 and the load sensor 18 are inserted into a hole 134 provided in the lower plate 132 of the pedestal portion 13, and the movement of the case portion of the load sensor 18 is restricted by the hole 134. Of course, it is good also as a structure which fixes the load sensor 18 to the base part 13 via the height adjustment board 22. FIG. Reference numeral 136 denotes a fixing screw for the height adjusting plate 22.
[0063]
The displacement sensor 19 measures the distance from the pressurizing unit 11, in this example, the distance from the lower surface of the upper plate 112, and is attached to the front side of the peripheral part of the test apparatus 10. That is, as shown in FIGS. 2 and 3, a notch 124 is provided on the front side of the middle plates 121 and 122, and the displacement sensor 19 is placed on the pedestal 13 via the height adjustment plate 23 in the notch 124. It is attached. The height adjusting plate 23 is provided for the purpose of finely adjusting the height of the displacement sensor 19. In addition, if the mounting position of the displacement sensor 19 is on the base part 13, there will be no special limitation. Reference numeral 127 denotes a mounting screw for the displacement sensor 19, and 128 denotes a fixing screw for the height adjusting plate 23.
[0064]
The displacement sensor 19 is not limited to the non-contact type as described above, but may be a contact type. Examples of the contact-type displacement sensor include a potentiometer and a linear encoder. Examples of the non-contact type displacement sensor include an optical sensor, a laser sensor, an ultrasonic sensor, an eddy current sensor, a magnetic sensor, and a capacitive sensor (for example, a proximity switch).
[0065]
In the present invention, the durability test of the press machine is performed by using the test apparatus 10 configured as described above as a test jig. However, since the durability test of the press machine is performed for a very long time, the test can be automatically performed.
[0066]
As shown in FIG. 2, the test system 30 further reads and analyzes measurement signals output from the load sensor 18 and the displacement sensor 19 of the test apparatus 10, and performs a test for controlling the test system 30. And a computer 31 in which software for software is installed. The output signals of the load sensor 18 and the displacement sensor 19 are amplified by the amplifiers 32 and 33, respectively, are converted into digital signals by the A / D converter 34, and are input to the computer 31. The test software of the computer 31 incorporates a program for automatically performing a durability test of the press machine. By using this test software, the performance of the press machine is evaluated. The control device 35 of the press machine is controlled. The number of press machine operations (or the number of presses) is counted by a counter (not shown) in the press machine controller 35. Further, the display device 36 displays the test status, measurement results, and the like, and also displays a test error message. The measurement result can be printed out by a printer (not shown).
[0067]
First, operation | movement of the test apparatus 10 in this test system 30 is demonstrated roughly in relation to operation | movement of 1 cycle of a press machine.
(1) The load sensor 18 and the displacement sensor 19 constantly output signals, and the test program incorporated in the computer 31 reads the signals.
(2) The initial state is a state in which the movable part 101 of the press machine is raised, and the pressure part 11 is also raised and does not push the elastic body 14 (a state slightly separated from the elastic body 14). .
(3) When the press machine starts to descend, the pressure unit 11 also descends accordingly.
(4) Then, the lower surface of the upper plate 112 of the pressure unit 11 pushes the elastic body 14. Since the elastic body 14 is supported by the load generation / transmission unit 12 and the load generation / transmission unit 12 is placed on the load sensor 18 of the pedestal 13, the force applied to the elastic body 14 is directly applied to the load sensor 18. Reportedly. At the same time, a load by the elastic body 14 is applied to the test press machine. Further, the displacement sensor 19 attached to the pedestal portion 13 measures the distance from the upper plate 112 of the pressing portion 11.
(5) The elastic body 14 gradually shrinks, and a large load is applied to the press machine, and at the same time, the load is applied to the load sensor 18.
(6) When the movable part 101 of the press machine reaches the bottom dead center (bottom end position), then starts to rise and returns to the initial start position (usually the top dead center position), the number of operations of the press machine (cycle) Number) is added once. The number of operations is counted by a counter of the press machine control device 35.
(7) In one cycle of the operation of the press machine, the largest load measured by the load sensor 18 is determined as the maximum load, and the shortest distance measured by the displacement sensor 19 is determined by the bottom dead center position and the test program. To do.
By repeatedly performing the above operation, the durability test of the press machine that is the test object can be automatically performed.
[0068]
Since this test apparatus 10 has a form similar to a mold and is configured to be attached to and detached from the press machine as if it were a mold, the test machine 10 has an elasticity provided in the test apparatus 10. The body 14 can load a load (virtual machining load) assumed to act during actual press working as a repeated load. The press machine generally deteriorates by receiving a load repeatedly over a long period of time, and eventually stops functioning as a lifetime. Meanwhile, by monitoring the bottom dead center or the maximum load, it is possible to quantitatively grasp and determine the durability performance of the press machine. The endurance performance can be determined by the number of operations of the test program incorporated in the computer 31 when the bottom dead center position or the maximum load of the press machine is out of a predetermined range. At the same time, the test program has a function of automatically stopping the press machine. Accordingly, it is possible to prevent the press machine and the test apparatus 10 from being damaged, destroyed, and the like, and to prevent excessive damage.
Moreover, since various virtual processing loads can be set by the elastic body 14, it is possible to carry out a test assuming any mold.
[0069]
In the durability test of the press machine, the test apparatus 10 may fail first. For example, the elastic body 14 is damaged. Even in such a case, the test program automatically stops the press machine. Further, an error message is displayed on the display device 36, or an alarm is issued with a buzzer or the like.
In this case, the operator determines whether the press machine has failed or the test apparatus 10 has failed. If the test apparatus 10 is out of order, the test is restarted by replacing parts and the like. If the press machine fails, the test ends.
[0070]
Further, the load of the press machine can be changed by changing the elastic body 14 to another type, that is, a different type of elastic body having a different virtual processing load, or changing the number of used elastic bodies. Accordingly, it is possible to perform an accelerated test of durability of the press machine. It is also possible to estimate the maximum processing load applicable to the press machine.
[0071]
It is desirable to design and manufacture the test apparatus 10 so that the lifetime is as long as possible, and the bending deformation is minimized. In order to perform a test suitable for actual use, a structure similar to a mold is preferable. Therefore, the plate members 111, 112, 121, 122, 131, and 132 that constitute the test apparatus 10 are manufactured to have a highly accurate flatness. Further, the load generation / transmission unit 12 needs to be designed to have high rigidity. Furthermore, with respect to the hardness, the upper plate 112, the middle plate 122, the lower plates 131 and 132, the positioning post 16, and the height adjustment plate 22 of the load sensor 18 are particularly hardened to prevent wear. Is necessary.
[0072]
Next, the test method for the press machine of the present invention will be described in more detail with reference to the flowchart of FIG. This control flow shows processing in one cycle of operation of the press machine, and is executed by a test program.
[0073]
First, parameters in this control flow are as follows.
K_J: Upper limit of load
K_K: Lower limit of load
I_J: Upper limit of bottom dead center
I_K: Lower limit of bottom dead center
S: Data accumulation interval (that is, the first interval)
N: Number of data accumulation (that is, the second interval)
M: Set number indicating the set number (numbered section) of data accumulation
D: Data number
C: Initial counter value in one cycle
C₁: Counter value read at any time
K₁: Load read from time to time
I₁: Position to read from time to time
K: Maximum load at that point in the cycle
I: Minimum position at that point in the cycle
K_P(M + 1, D): Mth set D + 1 maximum load
I_P(M + 1, D): D + 1 bottom dead center position of M + 1 set
[0074]
First, in the preparatory stage before the test, input of each set value and initialization processing are performed. That is, as the setting value of the test program, the upper limit value K of the load_J, Lower limit of load K_K, Lower dead center upper limit I_J, Lower limit I of the bottom dead center_K, The data accumulation interval S, and the data accumulation count N are input. Also, initialization M = 0 for the measurement set and initialization D = 0 for the measurement set are set. In addition, there is an input of a set value relating to accumulation of measurement data, which will be described later. Then, the press machine is operated to start the test (step S1). When the press machine starts operation, the test program reads the value (sampling period) of the cycle counter of the press machine control device 35, and at the same time, initialization of the maximum load K = 0, initial position of the bottom dead center position. I = α (where α is a value greater than the top dead center) is automatically performed (steps S2 to S4).
[0075]
Here, the determination flow of the maximum load and the bottom dead center will be described with reference to FIG. FIG. 6 shows the change over time of the load and position (displacement of the pressurizing unit 11) in one cycle of the press machine, and the mark ● indicates the measurement point.
[0076]
Along with the operation of the press machine, the test program reads the cycle counter value C₁Is read at any time (step S5), and the load data K from the load sensor 18 is synchronized with this.₁Is read (step S6). And the load data K at the current measurement point₁Is larger than the largest past load data K (step S7). As a result, K₁If> K, current load data K₁Is replaced with the maximum load K (step S8). For example, in FIG.₆Measurement point A₆Load data K₁Is the time t just before_FiveMeasurement point A_FiveIs larger than the maximum load K, so measurement point A₆Load data K₁Is replaced with the maximum load K. Similarly, time t₇Measurement point A₇Load data K₁Is the time t just before₆Measurement point A₆Is larger than the maximum load K, so measurement point A₇Load data K₁Is replaced with the maximum load K.
[0077]
Conversely, K₁If not> K, it has already been replaced by the maximum load K, so K₁= The process proceeds to the next process without changing K. For example, in FIG.₉Measurement point A₉Load data K₁Is the time t just before₈Measurement point A₈Is less than the maximum load K and the measurement point A₈Since the load data of is already replaced as the maximum load K, measurement point A₉The load data of is ignored. Similarly, time t₉Measurement point A₉Load data and time t_TenMeasurement point A_TenIn comparison with the load data, the measurement point A_TenThe load data is smaller and the measurement point A is already₈Is replaced with the maximum load K, so measurement point A_TenThe load data is also ignored. Therefore, in the case of FIG.₈Load data K₁Is determined to be the maximum load K.
[0078]
As described above, the maximum load is determined by the above-described maximum load determination flow (steps S7 and S8) for current and past load data periodically read at a certain timing. That is, every time load data is read, the load data is compared with the maximum value so far in one cycle. Thus, at the end of one cycle, the maximum load is determined as shown in FIG.
[0079]
The same processing is basically performed on the bottom dead center position data measured by the displacement sensor 19 (steps S9 and S10). That is, in step S5, the cycle counter value C₁Is read in synchronization with the position data I₁(Step S9), and the position data I at the current measurement point₁Are compared with the smallest past position data I (step S10). As a result, I₁If <I, the current position data I₁Is replaced with the bottom dead center position I (step S11). For example, in FIG.₆Measurement point B at₆Position data I₁Is the time t just before_FiveIs smaller than the position data I of₆Position data I₁Is replaced with bottom dead center position I. Similarly, time t₇Measurement point B at₇Position data I₁Is the time t₆Is smaller than the position data I at₇Position data I₁Is replaced with the bottom dead center position I.
[0080]
Conversely, I₁<If not I, it has already been replaced with the bottom dead center position I.₁= The process proceeds to the next process without changing I. For example, in FIG.₉Measurement point B at₉Position data I₁Is the time t just before₈Is larger than the position data I and the measurement point B₈Since the position data of has already been replaced as the bottom dead center position I, the measurement point B₉The position data of is ignored. Similarly, time t₉Measurement point B at₉Position data and time t_TenMeasurement point B at_TenIn comparison with the position data, the measurement point B_TenThe position data is larger and the measurement point B is already₈Is replaced as the bottom dead center position I, so measurement point B_TenThe position data of is also ignored. Therefore, in the case of FIG.₈Position data I₁Is determined as the bottom dead center position I.
[0081]
As described above, the bottom dead center is determined for the position data periodically read at a certain timing by the bottom dead center determination flow (steps S10 and S11). That is, each time the position data is read, a comparison is made with the previous minimum value in one cycle, and if it is smaller, a process of replacing it with the minimum value is performed. Thus, at the end of one cycle, the bottom dead center is determined as shown in FIG.
[0082]
When the determination flow for the maximum load and the bottom dead center is completed, 1 is added to the cycle counter value (step S12). Here, one cycle of press operation is completed.
[0083]
The flow described below relates to a method for accumulating data (maximum load data and bottom dead center data). FIG. 7 shows an example of data accumulation according to this method. The test program is initially input with the data accumulation interval S as the first interval and the data accumulation count N as the second interval. ing.
[0084]
First, it is determined whether it is the number of times data is stored (step S13). Here, the determination is made based on whether or not the counter value C at the beginning of one cycle is M · S ≦ C ≦ M · S + N−1 (if the determination is No, skip to step S19). Here, M is the set number in which the data is stored, S is the data storage interval (or set section), and N is the number of data storage (or the number of data stored per set).
[0085]
Since the durability test of a press machine must be operated millions of times and tens of millions of times, it is practically impossible to store data for all of them. Therefore, determine the interval (first interval or set interval) for storing data every time, and determine how many data items to store for each data storage interval in the test program. input.
[0086]
For example, in the example shown in FIG. 7, the data accumulation interval S = one million units and the data accumulation count N = 100.
In this case, for every 1 million presses, data is accumulated for the first 100 times. Therefore, 100 data items for each set are accumulated every 1 million cycles.
[0087]
Next, when it corresponds to the set which accumulate | stores data, a data number is added 1 each time it accumulates data (step S14). Next, an accumulation address (registered address) of each maximum load data and bottom dead center data in the (M + 1) th set is determined (step S15). Then, it is determined whether the data accumulation number D has reached the set number N (step S16). As a result, when D = N, that is, when the data accumulation number reaches the set number, one set number is added (step S17). Further, the data number is initialized (step S18).
[0088]
For all the maximum load data K, the accumulated data and the non-accumulated data, K is a preset upper limit value K._JAnd lower limit K_KIt is determined for each stroke whether it is within the range. Similarly, for the bottom dead center data I in the (M + 1) th set, all the bottom dead center data I are set to an upper limit value I set in advance._JAnd lower limit I_K(Step S19).
As a result, if any of the maximum load data or the bottom dead center data is outside the set range, the press machine is stopped and the flow is terminated (step S20). If the maximum load data and the bottom dead center data are both within the respective setting ranges, the test moves to the next cycle, and the processes after step S2 are repeated.
[0089]
As described above, the number of cycles is divided by a predetermined number of units, and data is accumulated at intervals divided by the appropriate number of cycles, so it is possible to accurately grasp fluctuations in bottom dead center accuracy and maximum load accuracy. It is possible to know the performance of the press machine more accurately.
[0090]
In the above description, the test of the press machine has been described. However, the test object is not limited to the press machine, and any machine that can reciprocate (for example, a cylinder device, a processing machine that rotates and reciprocates) can be applied. .
Also, an example of the test apparatus is shown, and a more compact configuration may be used, and any apparatus may be used as long as it applies a constant repetitive load to the press machine.
[0091]
The test program can also be changed within the scope of the present invention. For example, since the displacement curve approximates a sin curve, a flow for calculating the displacement curve may be provided to determine the bottom dead center position.
Further, since the load curve is similar to a convex parabola, trapezoid or triangle, a flow for calculating such a load curve may be provided to determine the maximum load.
[0092]
【The invention's effect】
As described above, according to the test method and test system for a press machine of the present invention, it is possible to automatically perform a test of the press machine for a very long period of time. In particular, it is possible to efficiently and accurately check the bottom dead center and the maximum load that are most important in the performance of the press machine.
Moreover, according to the test apparatus of this invention, it can handle like a metal mold | die and can test the press machine according to actual use.
Furthermore, according to the present invention, it is possible to provide a test program and its recording medium that can automatically perform a test of a press machine.
[Brief description of the drawings]
FIG. 1 is a cross-sectional front view of a test apparatus for a press machine according to the present invention.
FIG. 2 is a configuration diagram showing a test system for a press machine according to the present invention together with a cross-sectional side surface of the test apparatus.
FIG. 3 is a top view of the test apparatus as seen through.
FIG. 4 is a view showing an attachment portion of a displacement sensor attached to the test apparatus.
FIG. 5 is a flowchart showing a test method for a press machine according to the present invention.
FIG. 6 is a diagram showing temporal changes in load and position in one cycle of the press machine.
FIG. 7 is a diagram illustrating an example of data accumulation.
[Explanation of symbols]
10: Test device, 11: Pressurizing section, 12: Load generating / transmitting section, 13: Sensor mounting section (pedestal section), 14: Elastic body, 15: Guide means, 16: Positioning post, 17: Fitting hole, 18: Load sensor, 19: Displacement sensor, 20: Shaft, 21: Spacer, 22: Height adjustment plate, 23: Height adjustment plate, 30: Test system, 31: Computer, 35: Press machine control device, 36: Display device, 101: movable part, 102: fixed part

Claims (12)

A press machine testing device includes an upper pressurizing unit, a lower sensor mounting unit, a load generation / transmission unit provided between the pressurizing unit and the sensor mounting unit, and A load sensor that detects a load via the load generation / transmission unit, and a displacement sensor that detects a distance between the pressurization unit and the sensor mounting unit,
Setting the test apparatus in the press machine and measuring the bottom dead center position and / or the maximum load of the load when the press machine is operated;
A second section is set in the first section divided by a predetermined cycle number unit, and bottom dead center data and / or maximum load data in the second section is set for each first section. The process of accumulating;
Determining the bottom dead center position and / or the maximum load by comparing the accumulated bottom dead center data and / or maximum load data with a preset set value;
A test method for a press machine, comprising:   In one cycle of the operation of the press machine, position data representing the minimum value is retrieved from the position data group obtained by measuring with the displacement sensor, the position data is used as bottom dead center data, and / or the press machine. The load data representing the maximum value is retrieved from the load data group measured by the load sensor in one cycle of the operation, and the load data is used as the maximum load data. Test method for press machines.   When the displacement of the press machine is measured at each sampling period in the one cycle and the current position data is smaller than the smallest position data in the past, the current position data is replaced with bottom dead center data, and the current position data Is larger than the smallest past position data, the current bottom position data is ignored and the already replaced bottom dead center data is determined as the bottom dead center position and / or the sampling during the one cycle is performed. When the load of the press machine is measured every cycle and the current load data is larger than the largest load data in the past, the current load data is replaced with the maximum load data, and the current load data is the largest load in the past. If it is smaller than the data, the current load data is ignored and the maximum load data that has already been replaced is determined as the maximum load. Press machine method of testing according to claim 2, wherein Rukoto. The test method for a press machine according to any one of claims 1 to 3, wherein the second section is set at an initial stage of the first section. An upper pressurizing unit, a lower sensor mounting unit, a load generating / transmitting unit provided between the pressurizing unit and the sensor mounting unit, and a load from the pressurizing unit generating and transmitting the load A load sensor that is detected via a part, a displacement sensor that detects a distance between the pressure part and the sensor attachment part, and a test device attached to the movable part and the fixed part of the press machine, and a test A computer with a built-in program,
The test program can set a second section in the first section divided by the number of cycles of the press machine, and the bottom dead center in the second section for each first section. A function of accumulating data and / or maximum load data;
In the test of a press machine, a press machine of the test system, characterized in that it has a function of evaluating the maximum load of the bottom dead center position and / or load. The test program sequentially reads position data from the displacement sensor at a fixed timing for each cycle of the operation of the press machine, compares the current position data with the smallest position data in the past, and compares the current position data. Has a function of determining the bottom dead center position by replacing it with bottom dead center data when the current position data is small, and ignoring it when the current position data is large, and / or Load data is sequentially read from the load sensor at a fixed timing every cycle, and the current load data is compared with the largest load data in the past. If the current load data is large, it is replaced with the maximum load data. When the current load data is small, it has a function of determining the maximum load by ignoring it. Press machine test system of claim 5 wherein. 6. The test system for a press machine according to claim 5 , wherein the test program has a function of setting the second section to an initial stage of the first section. 6. The test system for a press machine according to claim 5, wherein the load generation / transmission section further includes guide means for the sensor mounting section. A function for causing the computer to sequentially read position data from the displacement sensor at a fixed timing for each cycle of operation of the press machine, and comparing the current position data with the smallest past position data, When the data is small, it is replaced with bottom dead center data, and when the current position data is large, it is ignored, and the function of determining the bottom dead center position of the press machine is divided into the number of cycles of the press machine. A second section can be set in the first section, and a function for accumulating bottom dead center data in the second section for each first section and the bottom dead center position are preset. A program for testing a press machine, which realizes a function for determining whether or not the value is within a set value range. A function that allows the computer to sequentially read the load data from the load sensor at a fixed timing for each cycle of the operation of the press machine and the current load data is compared with the largest load data in the past. When it is large, it is replaced with the maximum load data, and when the current load data is small, it is ignored to determine the maximum load of the press machine. A second section can be set in the section, the function of accumulating the maximum load data in the second section for each first section, and the maximum load within the set value range set in advance A program for testing a press machine, characterized by realizing a function for determining whether or not the machine is in a machine. The press machine testing program according to claim 9 or 10 , wherein the computer is caused to realize a function of setting the second section to an initial stage of the first section. Claims 9-11 press machine test program recording medium in which the press machine of the test program is characterized by comprising recorded in a computer-readable of any one of.

Images