JP5286871B2 - Method and apparatus for determining pass / fail of pressing process - Google Patents

Description

  The present invention relates to pass / fail judgment of a press (including press-fitting) process.

  2. Description of the Related Art Conventionally, a technique is known in which a load that changes with time or displacement in a pressing process is sampled at a predetermined sampling timing, and whether the pressing process is normal or abnormal is determined based on whether the sampling value is normal or abnormal. A technique for detecting a certain physical quantity and determining whether the detected value is normal is not limited to the pressing process.

  Patent Document 1 below discloses that the hardness of an article is determined by analyzing whether or not the maximum value and the minimum value of the amplitude level of the drop impact vibration are within an appropriate range.

  Patent Document 2 discloses that a plurality of level determination areas are set in order to determine whether or not a signal waveform is acceptable or not and determine a rejection level for the acceptance / rejection determination.

  Patent Document 3 discloses that the taper width of the pattern edge portion is detected from the signal intensity distribution of the pattern on the object to be measured, and that the measured value is determined to be correct when the detected taper width is within a predetermined range. Has been.

JP-A-8-193935 JP 2004-69590 A JP 2006-170969 A

  When determining whether or not the pressing process is normal based on whether or not the load value sampled at a predetermined sampling timing in the pressing process is normal, it is necessary to supply a sampling timing signal from the outside. In addition, it is desired that even if sampling is performed at a predetermined sampling timing, normality / abnormality (pass / fail) of the process can be determined more easily and reliably.

  The objective of this invention is providing the method and apparatus which can perform the pass / fail determination of a press process simply and with high precision.

The present invention is a method for determining pass / fail of a press process, the step of inputting a load value as a function of time or displacement detected during the press process, and among the load values, a sample point, an extreme point Detecting a plurality of hold points selected from among inflection points and peak points , and holding them as a combination of time or displacement and load value, and the hold points are within a predetermined time range or predetermined displacement range Determining whether or not the pressing process is acceptable by determining whether or not the abnormality is within an abnormality determination range set for each hold point consisting of a predetermined load value range; and outputting a determination result. Have

  Further, the present invention is a method for determining pass / fail of a pressing process, the step of inputting a load value as a function of time or displacement detected during the pressing process, and among the load values, a sample point, a pole A step of detecting at least one selected from a value point and a peak point and an inflection point and holding it as a combination of time or displacement and a load value; and the hold point is within a predetermined time range or a predetermined displacement Determining whether or not the pressing process is acceptable by determining whether or not the abnormality determination range is set for each hold point consisting of a range and a predetermined load value range, and outputting a determination result And have.

Further, the present invention is a method for determining pass / fail of a pressing process, the step of inputting a load value as a function of time or displacement detected during the pressing process, and among the load values, a sample point, a pole Detecting a plurality of hold points selected from a value point, an inflection point, and a peak point and holding them as a combination of time or displacement and load value; Determining whether or not the press process is acceptable by determining whether or not the normal determination range is set for each hold point including a displacement range and a predetermined load value range, and outputting a determination result Steps.

  Further, the present invention is a method for determining pass / fail of a pressing process, the step of inputting a load value as a function of time or displacement detected during the pressing process, and among the load values, a sample point, a pole A step of detecting at least one selected from a value point and a peak point and an inflection point and holding it as a combination of time or displacement and a load value; and the hold point is within a predetermined time range or a predetermined displacement Determining whether or not the press process is acceptable by determining whether or not it exists within a normal determination range set for each hold point comprising a range and a predetermined load value range, and outputting a determination result And have.

Further, the present invention is an apparatus for determining the success or failure of a pressing process, a means for inputting a load value as a function of time or displacement detected during the pressing process, and a sample point, pole value point, an inflection point, and holds as a combination of selection means for selecting a plurality of hold points from the peak point, of the load value, and the time to detect a hold point selected or displacement and load value means and the hold points, the by determining whether present in the abnormality determination range set for each of the hold points of a predetermined time range or a predetermined displacement range and a predetermined load value range It has a means for judging the pass / fail of the pressing process and a means for outputting the judgment result.

Further, the present invention is an apparatus for determining the success or failure of a pressing process, a means for inputting a load value as a function of time or displacement detected during the pressing process, and a sample point, pole value point, an inflection point, and holds as a combination of selection means for selecting a plurality of hold points from the peak point, of the load value, and the time to detect a hold point selected or displacement and load value And determining whether the hold point is within a normal determination range set for each hold point comprising a predetermined time range or a predetermined displacement range and a predetermined load value range. It has a means for judging the pass / fail of the pressing process and a means for outputting the judgment result.

  According to the present invention, it is possible to easily and accurately determine whether or not the pressing process is successful.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In FIG. 1, the block diagram of the pass / fail determination apparatus of the press process in this embodiment is shown. The apparatus 1 shown in FIG. 1 also functions as a digital indicator, and visually displays a load change or a displacement of the press machine in a press process as a graph display or a digital numerical value. The digital indicator is incorporated in the press process control mechanism that controls the press process, and the load signal from the strain gauge type transducer that measures the load during pressing, or the displacement meter (sensor) that measures the displacement of the press machine. Input the displacement signal.

  The device 1 according to the present embodiment includes an input / output interface I / F 10, a memory 12, a display device 14, a CPU 16, a ROM 18, and a RAM 20.

  The input / output interface I / F 10 inputs a load signal from a transducer or a displacement signal from a displacement meter.

  In accordance with the program stored in the ROM 18, the CPU 16 converts the input load signal into a digital signal using the RAM 20 as a working memory, holds it at a predetermined timing, and stores it in the memory 12. In the present embodiment, instead of the load value at a predetermined sampling timing as in the prior art, it is stored in the memory 12 as a set of time or displacement and load value. The time means the elapsed time from the start of the pressing process, and the displacement means the amount of displacement of the press machine from the start of the pressing process. For example, when the load value held at a certain elapsed time t1 is W1, the CPU 16 stores the set of (t1, W1) in the memory 12 as a hold value. Alternatively, when the load value held at a certain displacement amount x1 is W2, the CPU 16 stores a set of (x1, W2) in the memory 12 as a hold value.

The hold timing in this embodiment is not unambiguous and is held at a plurality of timings (multi-hold). Specific examples are as follows.
(1) Sample hold (2) Extreme value (maximum value, minimum value) hold (3) Inflection point hold (4) Peak hold

  (1) to (4) can be appropriately combined. For example, (1) and (2), (1) and (3), (1) and (4), (2) only, (2) and (3), (2) and (4), (3) Only (3) and (4), only (4), etc. Only (1) is a sampling hold similar to the conventional one. In order to determine the normality / abnormality of the pressing process, (2) and (3) are particularly important, and it is preferable to include at least one of (2) and (3). Only (2), only (3), (2) and (3), (1) and (3), etc. The timing at which the data is held may be appropriately selected by the user, or may be incorporated in the apparatus as a program in the ROM 18 in advance. When the user selects, it is preferable that a plurality of hold patterns are displayed on the display device 14 as menus, and the user can select them while referring to the menus. For example, one user selects (2) and (3) as the hold pattern, and another user selects only (3). By configuring the ROM 18 with a rewritable ROM such as an EEPROM, the hold pattern selected by the user can be stored in the ROM 18.

  In addition, the CPU 16 displays the sequentially acquired load values on the display device 14 as a function of time or displacement. A load value as a function of time or displacement is called a load profile. The display device 14 is composed of a liquid crystal monitor or an organic EL monitor.

  FIG. 2 shows an example of the load profile 15 displayed on the display device 14. The horizontal axis X is time or displacement, and the vertical axis Y is a load value. The load profile 15 is shown as a curve in the XY coordinate system. The user can grasp the state of the pressing process by visually recognizing the load profile 15.

  On the other hand, the memory 12, the ROM 18, or the RAM 20 stores determination window data for determining normality / abnormality of the pressing process. The determination window is set as a two-dimensional range that combines a time or displacement range and a load value range. For example, in a certain determination window, the time range is set as t1 to t2, and the load value range is set as W1 to W2. The determination window is compared with the hold value held by the CPU 16 and stored in the memory 12, and it is determined whether or not the hold value is included in the determination window. There are two types of judgment windows. The first is a normal determination window. If the hold value is included in this range, the press process is determined to be normal. The second is an abnormality determination window. If the hold value is included in this range, the press process is determined to be abnormal. One or more determination windows are set. For example, only a normal determination window, only an abnormality determination window, and a mixture of a normal determination window and an abnormality determination window. The CPU 16 determines whether or not the hold value is included in the determination window, and determines whether the pressing process is normal or abnormal according to the determination result. There may be various combinations depending on what determination window is set and whether or not the hold value is included in the set determination window. The CPU 16 comprehensively determines normal / abnormal depending on whether the determination window and the hold value belong. The normal / abnormal determination result is supplied from the input / output I / F 10 to the press control device. The press control device controls whether to perform the press process again or to execute some error processing based on the determination result.

  FIG. 3 shows a hold pattern. This is an example of sample hold, inflection point hold, and peak hold. The sample hold point is S1, the inflection point hold point is S2, and the peak hold point is S3. Each hold point is a combination of time or displacement and the load value at that time as described above. If the time of the sample hold point S1 is t1, and the load value is W1, then S1 = (t1, W1). Similarly, if the time at the inflection point hold point S2 is t2 and the load value is W2, S2 = (t2, W2), the time at the peak hold point S3 is t3, and the load point is W3, S3 = (t3, W3). It is. The sample hold point S1 is obtained by sampling and holding a load signal in accordance with an external sampling timing signal. FIG. 3 shows a measurement start signal and a sampling timing signal. FIG. 3 shows a state in which waveform measurement starts at time t0 according to the measurement start signal, and the sample hold point S1 is sampled and held at time t1 according to the sampling timing signal. The inflection point hold value S2 is held by searching for the inflection point of the load profile 15. The inflection point is defined as a point where the inclination of the load profile 15 changes. If the slope changes more than a predetermined threshold before and after a certain point, that point is held as an inflection point. The inflection point does not need to be used in a mathematically exact sense, and can be grasped as a point where the inclination changes remarkably. The inflection point in the pressing process is physically significant as the point in time when the workpiece is completely deformed in the pressing process. The peak hold S <b> 3 is held by searching for the peak value of the load profile 15. The peak value in the pressing process is physically significant as the completion point of the pressing process.

  FIG. 3 also illustrates a determination window in addition to the sample hold point S1, the inflection point hold point S2, and the peak hold point S3. The determination window 100 is a normal determination window for determining the sample hold point S1. The determination window 200 is a normal determination window for determining the inflection point hold point S2. The determination window 300 is a normal determination window for determining the peak hold point S3. The determination windows 100, 200, and 300 are set so as to include a trajectory of the load profile 15 that will be obtained when the pressing process is normally executed. For example, the determination window 100 is set so as to include a load W obtained at a certain sampling timing t when the pressing process is normally executed. When the lower limit of the time range of the determination window 100 is ta and the upper limit is tb, Δt is set as a fixed value, and ta = t−Δt and tb = t + Δt are set. It can also be set as a displacement range instead of a time range. When the lower limit of the load range of the determination window 100 is Wa and the upper limit is Wb, ΔW is set as a fixed value, and Wa = W−ΔW and Wb = W + ΔW are set. The same applies to the determination window 200, and is set so as to include an inflection point load W 'obtained at a certain timing t' when the pressing process is normally executed. When the lower limit of the time range of the determination window 200 is tc and the upper limit is td, Δt is set as a fixed value, and tc = t′−Δt and td = t ′ + Δt are set. If the lower limit of the load range of the determination window 200 is Wc and the upper limit is Wd, ΔW is set as a fixed value, and Wc = W′−ΔW and Wd = W ′ + ΔW are set. The same applies to the determination window 300, and is set so as to include a peak load W "obtained at a certain timing t" when the pressing process is normally executed. When the lower limit of the time range of the determination window 300 is te and the upper limit is tf, Δt is a fixed value, and te = t ″ −Δt and tf = t ″ + Δt are set. If the lower limit of the load range of the determination window 300 is We and the upper limit is Wf, ΔW is a fixed value, and We = W ″ −ΔW and Wf = W ″ + ΔW.

  As already described, any one of sample hold, inflection point, peak hold, or a combination of these can be used as the hold point. FIG. 4 illustrates these combinations. “Mode 1” is a combination of sample hold and inflection point hold, “Mode 2” is a combination of sample hold and peak hold, “Mode 3” is a combination of inflection point hold and peak hold, and “Mode 4” is a sample hold And a combination of inflection point hold and peak hold. Each mode not only defines a hold point, but also defines a decision window. This is because the hold point and the determination window correspond as shown in FIG. When “mode 1” is selected, sample hold and inflection point hold are selected as hold points, and determination window 100 and determination window 200 are selected as determination windows. When “mode 2” is selected, sample hold and peak hold are selected as hold points, and determination window 100 and determination window 300 are selected as determination windows. When “mode 3” is selected, inflection point hold and peak hold are selected as hold points, and determination window 200 and determination window 300 are selected as determination windows. When “mode 4” is selected, sample hold, inflection point hold, and peak hold are selected as hold points, and determination window 100, determination window 200, and determination window 300 are selected as determination windows.

  Assume that “mode 4” is selected. The CPU 16 creates a load profile 15 from load signals that are sequentially input and displays the load profile 15 on the display device 14, and also performs sample hold, inflection point hold, and peak hold to sequentially store the hold points in the memory 12. The sample hold is executed based on an external sampling timing signal. Inflection point hold and peak hold can be executed without using an external sampling timing signal. Next, the CPU 16 compares each held value with the corresponding determination window, and determines whether or not it is included in the determination window. That is, it is determined whether or not the sample hold point S1 is included in the determination window 100, whether or not the inflection point hold point S2 is included in the determination window 200, and the peak hold point S3 is included in the determination window 300. It is determined whether or not. When the sample hold point S1 is included in the determination window 100, the inflection point hold point S2 is included in the determination window 200, and the peak hold point S3 is included in the determination window 300, the pressing process is normal. It is determined that Whether or not each hold point is included in the corresponding determination window may be determined after all the pressing steps are completed, or is it included in the corresponding determination window each time each hold point is detected. It may be determined whether or not. In this case, for example, it is determined whether or not it is included in the determination window 100 when the sample hold point S1 is obtained, and it can be determined that the pressing process is abnormal when it is determined that it is not included.

  Note that the CPU 16 basically includes the sample hold point S1 in the determination window 100, the inflection point hold point S2 in the determination window 200, and the peak hold point S3 in the determination window as described above. 300, it is determined that the pressing process is normal, but it may be determined normal if at least any two of the determination windows 100, 200, 300 include a hold point. You may weight between the windows 100, 200, and 300. FIG. For example, the weights of the determination window 200 and the determination window 300 are relatively increased, the weight of the determination window 100 is relatively decreased, and the sample hold point S1 is not included in the determination window 100, but the inflection point hold point If S2 is included in the determination window 200 and the peak hold point S3 is included in the determination window 300, it is determined as normal. It is preferable to determine the weights of the determination windows 100, 200, and 300 according to the importance of each hold point in the pressing process. Since the inflection point indicating the deformation of the molding object in the pressing process is highly important, the weight of the determination window 200 can be maximized. When the hold point is included in the determination window, it is 2 points. When the hold point is not included, it is determined as 0 point, and it is determined whether each hold point is included in the corresponding determination window. It may be determined to be normal when the threshold is exceeded, and may be determined to be abnormal when it is equal to or less than the threshold. The difference between the weighted addition value and the threshold value may be used as a ratio to indicate how normal it is even when it is determined to be normal. For example, it is determined as normal with a probability of 80%. Gray zones may be provided above and below the threshold value, and the determination of whether normal or abnormal may be reserved as long as it is within this gray zone.

FIG. 5 shows processing when “mode 1” is selected. The sample hold point S1 and the inflection point hold point S2 are searched as the hold points, and it is determined whether or not they are included in the determination windows 100 and 200, respectively. When the sample hold point S1 is included in the determination window 100 and the inflection point hold point S2 is included in the determination window 200, the CPU 16 determines that the pressing process is normal. That is, when the sample hold point S1 is (t ′, W ′) and the inflection point hold point S2 is (t ″, W ″),
ta ≦ t ′ ≦ tb, Wa ≦ W ′ ≦ Wb (1)
And tc ≦ t ″ ′ ≦ td, Wc ≦ W ″ ≦ Wd (2)
Is determined to be normal.
The above (1) is a determination of whether or not it is included in the determination window 100, and (2) is a determination of whether or not it is included in the determination window 200.

  FIG. 6 shows another example of the mode. This is a case where sample hold and inflection point hold are executed as hold points. The sample hold is executed in accordance with an external sampling timing signal, and is executed at predetermined times t1 and t2. Sample hold points S4 and S5 are acquired and stored in the memory 12. Further, the inflection point hold point S2 is stored in the memory 12. On the other hand, as a determination window, a determination window 400 is set corresponding to the sample hold point S4, a determination window 500 is set corresponding to the sample hold point S5, and a determination window 200 corresponding to the inflection point hold point S2. Is set. The determination windows 200 and 400 are normal determination windows and are determined to be normal when the hold point is included in the window. On the other hand, the determination window 500 is an abnormality determination window, and is a window that is determined to be abnormal when the hold point is included in this window. The abnormality determination window 500 is set on a locus of a load profile that will occur when there is an abnormality in the pressing process. For example, mutually overlapping trajectory portions are extracted from a plurality of past load profile trajectories when there is an abnormality in the pressing process, and an abnormality determination window is set so as to include the extracted trajectories. The abnormality determination window 500 is stored in advance in the memory 12 or the ROM 18 in the same manner as the normality determination window. The CPU 16 determines whether the sample hold point S4 is included in the determination window 400, whether the sample hold point S5 is included in the determination window 500, and whether the inflection point hold point S2 is included in the determination window 200. Determine. When the sample hold point S4 is included in the determination window 400, the sample hold point S5 is not included in the determination window 500, and the inflection point hold point S2 is included in the determination window 200, the pressing process is normal. It is determined that On the other hand, when the sample hold point S5 is included in the determination window 500, the CPU 16 determines that the pressing process is abnormal.

  If either the sample hold point S4 or the inflection point hold point S2 is not included in the determination windows 400 and 200 and the sample hold point S5 is not included in the determination window 500, the CPU 16 performs the pressing process. Determined as normal. If neither the sample hold point S4 nor the inflection point hold point S2 is included in the determination windows 400 and 200 and the sample hold point S5 is not included in the determination window 500, the CPU 16 determines that the pressing process is abnormal. To do. In short, even if the sample hold point S5 is not included in the determination window 500, normal / abnormal is determined according to the relationship between the remaining hold points and the determination window. Of course, when the sample hold point S5 is included in the determination window 500, the pressing process is determined to be abnormal regardless of the remaining sample hold points.

  FIG. 7 shows another example of the mode. This is a case where extreme value hold and inflection point hold are executed as hold points. In the extreme value hold, a point at which the load profile becomes a maximum value or a minimum value is searched and held. The extreme value hold can be executed without using an external sampling timing signal. Since the inflection point hold is the same, an external sampling timing signal becomes unnecessary. Further, when there is no local maximum point or local minimum point in the load profile, even if the local maximum value hold is executed, there is no hold point as a result and no data is stored in the memory 12 (null data indicating that there is no local data may be stored). In FIG. 7, there is no extreme value hold point, and only the inflection point hold point S2 exists. The determination window 500 corresponds to the extreme value hold point, and the determination window 200 corresponds to the inflection point hold point S2. The CPU 16 determines whether or not the extreme value hold point is included in the determination window 500 and whether or not the inflection point hold point S2 is included in the determination window 200. As described with reference to FIG. 6, the determination window 500 is an abnormality determination window. If the hold point is included here, the pressing process is determined to be abnormal. In FIG. 7, there is no extreme value hold point because there is no extreme value, and therefore the hold point is not included in the determination window 500. Here, even if the hold point does not exist in the first place, it is considered that it is not included in the corresponding determination window. When the inflection point hold point S2 is included in the determination window 200, the pressing process is determined to be normal.

  If the extreme point hold point is not included in the determination window 500 and the inflection point hold point S2 is not included in the determination window 200, the CPU 16 determines that the pressing process is abnormal.

  FIG. 8 shows another load profile in the mode of FIG. This is a mode in which extreme value hold and inflection point hold are executed, and is a case where a maximum value and a minimum value exist. The maximum value and the minimum value exist, and the maximum value hold point S6 and the minimum value hold point S7 are searched and stored in the memory 12. Further, the inflection point hold point S2 is searched and stored in the memory 12.

  The local maximum hold point S6 corresponds to the determination window 500, and the inflection point hold point S2 corresponds to the determination window 200. The CPU 16 reads the local maximum hold point S6 from the memory 12 and determines whether it is included in the determination window 500. When the local maximum hold point S6 is included in the determination window 500, the pressing process is determined to be abnormal. On the other hand, when the local maximum hold point S6 exists but is not included in the determination window 500 and the inflection point hold point S2 is included in the determination window 200, the pressing process is determined to be normal. When the local maximum hold point S6 exists but is not included in the determination window 500 and the inflection point hold point S2 is not included in the determination window 200, the pressing process is determined to be abnormal.

  In this embodiment, sample hold, inflection point hold, peak hold, and extreme value hold are illustrated as hold points, and normal determination windows and abnormality determination windows are illustrated as determination windows, but the combination of these hold points and determination windows is The examples are not limited to those disclosed in the above embodiment. For example, extreme hold and peak hold may be selected as the hold value, and an abnormality determination window may be set as the determination window and a normal determination window may be set as the peak hold. Further, an abnormality determination window may be set for the extreme value hold, and an abnormality determination window may be set for the peak hold.

  In the present embodiment, the user may select which hold point to use, and may select which of the normality determination window or the abnormality determination window to use.

  Further, in this embodiment, assuming that the inflection point hold point is the most important, only the inflection point hold point is executed, and it is determined whether it is included in the normality determination window 200 to determine normality / abnormality. Good. An inflection point hold point may be used as an essential hold point, and other hold points may be selected as appropriate by the user.

It is a block diagram of embodiment. It is explanatory drawing which shows the example of a display of a display apparatus. It is explanatory drawing of a hold point and a determination window. It is mode explanatory drawing which prescribes | regulates a hold point. It is explanatory drawing of a hold point and a determination window. It is explanatory drawing of a hold point and a determination window. It is explanatory drawing of a hold point and a determination window. It is explanatory drawing of a hold point and a determination window.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Press process pass / fail determination apparatus, 10 interface, 12 memory, 14 display apparatus, 16 CPU, 18 ROM, 20 RAM.

Claims (10)

A method for determining pass / fail of a press process,
Inputting a load value as a function of time or displacement detected during the pressing process;
Among the load values, detecting a plurality of hold points selected from sample points, extreme points, inflection points, peak points , and holding as a combination of time or displacement and load values;
Pass / fail of the pressing step is determined by determining whether or not the hold point is within an abnormality determination range set for each hold point including a predetermined time range or a predetermined displacement range and a predetermined load value range. Determining
Outputting a determination result; and
A pass / fail judgment method for a pressing process, characterized by comprising: A method for determining pass / fail of a press process,
Inputting a load value as a function of time or displacement detected during the pressing process;
Detecting at least one selected from a sample point, an extreme point, and a peak point among the load values and an inflection point, and holding as a combination of time or displacement and load value;
Pass / fail of the pressing step is determined by determining whether or not the hold point is within an abnormality determination range set for each hold point including a predetermined time range or a predetermined displacement range and a predetermined load value range. Determining
Outputting a determination result; and
A pass / fail judgment method for a pressing process, characterized by comprising: The method according to claim 1,
The abnormality determination range is set as a range including a locus of a load value as a function of time or displacement obtained when the pressing process is abnormally performed. A method for determining pass / fail of a press process,
Inputting a load value as a function of time or displacement detected during the pressing process;
Among the load values, detecting a plurality of hold points selected from sample points, extreme points, inflection points, peak points, and holding as a combination of time or displacement and load values;
Pass / fail of the pressing step is determined by determining whether or not the hold point exists within a normal determination range set for each hold point including a predetermined time range or a predetermined displacement range and a predetermined load value range. Determining
Outputting a determination result; and
A pass / fail judgment method for a pressing process, characterized by comprising: A method for determining pass / fail of a press process,
Inputting a load value as a function of time or displacement detected during the pressing process;
Detecting at least one selected from a sample point, an extreme point, and a peak point among the load values and an inflection point, and holding the time or a combination of displacement and load value; and
Pass / fail of the pressing step is determined by determining whether or not the hold point exists within a normal determination range set for each hold point including a predetermined time range or a predetermined displacement range and a predetermined load value range. Determining
Outputting a determination result; and
A pass / fail judgment method for a pressing process, characterized by comprising: The method according to any one of claims 4 and 5,
The normality determination range is set as a range including a trajectory of a load value as a function of time or displacement obtained when the pressing process is normally executed. An apparatus for determining pass / fail of the pressing process,
Means for inputting the load value as a function of time or displacement detected during the pressing process;
A selection means for selecting a plurality of hold points from sample points, extreme points, inflection points, and peak points as points to be held,
Means for detecting a selected hold point out of the load values and holding it as a combination of time or displacement and load value;
The hold point is the pressing step by determining whether present in the abnormality determination range set for each of the hold points of a predetermined time range or a predetermined displacement range and a predetermined load value range Means for determining pass / fail;
Means for outputting the determination result;
A pass / fail determination apparatus for a pressing process, characterized by comprising: The apparatus of claim 7.
The abnormality determination range is set as a range including a trajectory of a load value as a function of time or displacement obtained when the pressing process is abnormally performed. An apparatus for determining pass / fail of the pressing process,
Means for inputting the load value as a function of time or displacement detected during the pressing process;
A selection means for selecting a plurality of hold points from sample points, extreme points, inflection points, and peak points as points to be held,
Means for detecting a selected hold point out of the load values and holding it as a combination of time or displacement and load value;
The hold point is the pressing step by determining whether or not present in the normal determination range set for each of the hold points of a predetermined time range or a predetermined displacement range and a predetermined load value range Means for determining pass / fail;
Means for outputting the determination result;
A pass / fail determination apparatus for a pressing process, characterized by comprising: The apparatus of claim 9.
The normality determination range is set as a range including a trajectory of a load value as a function of time or displacement obtained when the pressing process is normally executed.

Images