JPH05285889A - Life predicting/judging method of die and device therefor - Google Patents

Abstract

PURPOSE:To make it possible that life judgment is performed efficiently and quality of manufactured goods can be maintained stably by measuring working condition of a die at the time of material blanking work of a press working machine and comparing the result with pre-determined work condition at the life terminus time of the die. CONSTITUTION:Lowering amount (displacement amount) of a die per unit-hour in the infinitesimal time at the blanking time of sheet material is measured by displacement sensors 2 of eddy current type mounted in a pair on the side of upper and lower dies, and their measuring signals are input to a control part 7, and the data (D) obtained by an arithmetic part 7a is input to a hysteresis memory 7b to always store new hysteresis data, and at the same time, force a comparator 7f to compare it with a life predicting set value (D3) read out from a life predicting memory 7e, and, in case of D>=D3, an abnormal signal is generated and a die life indicating lamp 6d is lit, and, in the control part 7 also, judgements of initial condition, whether it is good or not, and existence of mis-shot are performed from the output of an initial condition judging memory 7c and a mis-shot judging memory 7d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for predicting / determining the life of a die used for a press working machine and punching a sheet material into a predetermined shape.

[0002]

2. Description of the Related Art Conventionally, in a process of punching a sheet material into a predetermined shape using a press working machine, a die used in the press working machine wears a contact portion between a die and a punch as the working time elapses. Due to
It must be maintained at the right time. That is, in the field, it is called re-sharpening, and the worn portion of the die or punch worn by punching work is ground for a predetermined length (5 to 10% of the product thickness is a standard), and the contact portion is renewed to always be good. It is considered that the punching work is performed in such a state. Therefore, in determining the timing of this resharpening,
The state of burrs generated at the edges of punched products and sheet materials (scraps) is microscopically observed and judged. For this purpose, various inspections using visual inspections and optical microscopes are carried out. Further, even if the object to be punched out is a minute burr such as an FD (floppy disk), the product quality may be significantly impaired (the burr peeled off in the disk body may damage the magnetic surface). In the case of sheet materials, more strict quality control is required. Therefore, even when carrying out the various inspections described above,
Image processing using a computer has been introduced, and the inspection accuracy is improved by performing a more detailed inspection such as enlarging the burr portion and observing the entire area. As a result, it becomes possible to reasonably and surely judge the proper timing for reshaping the die, and the efficiency of the maintenance work of the press machine has been improved.

However, even if the highly accurate inspection can be performed as described above, the timing of the inspection must be determined only by the experience and intuition of a skilled worker. In view of such a situation, a method for predicting the life of a mold used in a general press molding machine has been introduced. This method is to monitor the press molding condition by comparing the pressure obtained from the stroke pressure diagram during normal operation of the press working machine with the pressure during actual operation. That is, the pressure at the time of molding continuously changes, and the respective pressures at a plurality of certain time points are compared to judge the quality of the press molding in time series.

[0004]

However, the above-described method used for press molding has an effect only when it is applied to press molding for a material having a certain thickness, such as FD (floppy disk). Not suitable for very thin sheet materials. That is, since the sheet member is thin, the punching pressure applied to this sheet member changes discontinuously, the time for punching by the die (punch, die) is instantaneous, and the pressure at that time cannot be detected in time series. It was virtually impossible, and as a result, it was very difficult to plan the proper timing for resharpening.

In view of the above problems, it is an object of the present invention to provide a die life prediction method and a die prediction method which can reliably and easily predict the timing of resharpening of a die.

[0006]

The object of the present invention is a method for predicting / determining the life of a die used in a press machine for punching a material into a predetermined shape, wherein the operating state of the die during the punching operation of the material. Is measured and compared with an operating state when the life of the mold is reached, which is separately obtained in advance, to predict the life of the mold, which is achieved by a method of predicting / determining the life of the mold.

Another object of the present invention is a method of predicting / determining the life of a die used in a press machine for punching a material into a predetermined shape, which is a method of predicting the operating state quantity of the die measured during the punching operation of the material. This is achieved by a method for predicting / determining the life of a die, which is characterized in that the number of remaining shots from the change with the number of shots of the die to the operation state when the life of the die is reached is obtained.

Alternatively, it is preferable that the operating state amount is an average speed from the time when the die comes into contact with the material until the punching work is completed. Alternatively, it is preferable that the operating state amount is a speed immediately after completion of punching of the material of the mold until the mold reaches the bottom dead center. Furthermore, it is a device for predicting / determining the life of a die used in a press machine for punching a material into a predetermined shape, and a means for measuring the amount of displacement of the die at the time of punching the material, and an operating state based on the displacement. Prediction of the life of the mold comprising means for calculating the indicated amount and means for storing the amount of operating state when the mold reaches its life
Achieved by the judging device.

Further, a die life predicting / determining device used in a press machine for punching a material into a predetermined shape, means for measuring a displacement amount of the die during a punching operation of the material,
And a means for calculating an amount showing an operating state from the displacement amount, a means for storing the operating state amount when the die reaches the end of its life, and / or a means for computing the number of shots until reaching the end of its life. This is achieved by a die life prediction / determination device characterized by the above.

Further, a die life predicting / determining device used in a press working machine for punching a material into a predetermined shape, means for measuring a displacement amount of the die during a punching operation of the material,
Prediction of the life of the mold comprising means for calculating an amount indicating the operation state from the displacement amount, and means for storing the operation state of the mold when the initial position of the mold is normal.
Achieved by the judging device.

As described above, the remaining number of shots can be calculated by using the means for calculating the number of shots until the die reaches the end of its life. It should be noted that by using a means for storing the operation state of the mold when the initial position of the mold is normal, the quality of the initial setting can be predicted.

[0012]

When predicting the life of a die used in a press machine for punching a material into a predetermined shape, the amount of displacement of the die obtained by the measuring means is taken in and the operating state quantity is calculated, which is calculated in advance. Since the life of the mold can be predicted by comparing with the stored operation state amount of the mold when the mold reaches its life, the mold can be resharpened without missing the timing. As a result, the quality is stable without causing burrs or the like on the edges of the punched material. Further, it is possible to predict how many shots the life will be reached from the current operation state quantity by using the operation state quantity and the shot number which are measured and stored in advance when the die reaches the life. Further, for example, a means for displaying the predicted value,
By providing a means for displaying a warning when the predicted value reaches a certain value or less, reshaping of the mold can be prevented, and the quality of the material to be punched becomes more stable.

Further, the operation state quantity of the die is determined by a moving distance, an operation speed, an acceleration, an average speed from the die hitting the material to the completion of cutting, or from the completion of cutting to the bottom dead center. Any of these speeds will achieve the above objectives. Further, the initial position of the mold can be set surely and smoothly by the means for storing the operation state quantity when the initial position of the mold is normal.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a die life predicting method and a life predicting apparatus according to the present invention will be described below by applying it to a press working machine. That is, FIG. 1 shows an FD (flexible disk)
In the manufacturing process of 1., an overall perspective view showing an outline of a press machine for punching a sheet material into a predetermined shape, FIG. 2 is an explanatory view showing a punching state of the sheet material in the press machine,
FIG. 3 is a front view of the same, FIG. 4 is a block diagram, FIG. 5 is a flow chart showing an operation process for predicting whether the initial state is good, and FIG. 6 is a flow diagram showing an operation process for performing a miss shot prediction.
Is a flow chart showing the operation process for predicting the life, FIG. 8 is a graph in which the vertical displacement of the die at the time of punching is measured in a minute time and the slope is drawn continuously, and FIG. 9 is the number of punches and the burr area. FIG. 10 is a graph showing the relationship between the die lowering speed and the number of shots from the start to the end of cutting the sheet material until the die is separated from the sheet material, and FIG. 6 is a graph showing the relationship between the speed and the number of shots when the mold is released from the load of cutting the sheet material.

In the drawing, A is a press working machine, which is configured to punch a long thin sheet material M to be loaded into a predetermined shape (disc shape of a flexible disk). 1 is an upper die 1 equipped on the press machine A
It is a mold constituted by a and a lower mold 1b, and a die 1c is arranged in the upper mold and a punch 1d is arranged in a pair in the lower mold.

Reference numeral 2 denotes an eddy current type displacement sensor attached to the side portions of the upper die 1a and the lower die 1b in a pair, and the die 1c
Die 1 punches sheet material M in a minute time
The amount of decrease (displacement amount) of c per unit time is measured (sampled). The vertical displacement of the die 1c per unit time is shown as an inclination in FIG.
Is. In FIG. 8, the range indicated by U is the range in which the sheet material M is punched out by the die 1c, and the inclination is small and the speed of the die 1c during that time is slow. Then, paying attention to the range indicated by U, the die 1c
The relationship between the speed (that is, the slope of the range indicated by U in FIG. 8) and the number of shots is plotted a certain number of times in a graph.
It is a graph shown in 0. Similarly, in FIG. 8, the range indicated by V is the range immediately after the punching of the sheet material M is completed,
It indicates that the inclination is large and the speed of the die 1c during that time rapidly increases. Then, paying attention to the range indicated by V,
FIG. 11 is a graph in which the relationship between the speed of the die 1c (that is, the slope of the range indicated by V in FIG. 8) and the number of shots is plotted a certain number of times on the graph.

The algorithm for determining the above-mentioned inclination, that is, the acceleration of the die 1c per unit time, and the life prediction of the die (die) are as follows. Mold contact detection: The displacement sensor detects the moment when the die surface and the punch surface contact. Sampling: After contact detection, the displacement sensor performs sampling at a preset sampling period and number of sampling operations of the die. Velocity calculation: When the position of the die is X (t), t =
The velocity V ₁ is calculated by sampling the die positions at t ₁ and t = t _{2 at two} preset points t ₁ and t _{2, that} is, X (t ₁ ) and X (t ₂ ).

V ₁ = X (t ₂ ) −X (t ₁ ) / t ₂ −t ₁ Similarly, when calculated with t ₃ and t ₄ set in advance, V ₂ = X (t ₄ ) −X (T ₃ ) / t ₄ −t ₃ Acceleration calculation: Therefore, the acceleration a is obtained (inclined) by V ₂ −V ₁ / t ₄ −t ₂ . Life Prediction Calculation: Let X be the number of shots and Y be the speed, and Y =
By accumulating the historical data in the formula of aX + b, a and b are determined, and it is determined from the conventional empirical rule that Y = −33 is satisfied for this type of die, so these are satisfied. The life of the mold can be roughly predicted by calculating X.

Reference numeral 3 is a mold guide shaft, 4 is a feed roll, 5 is a product stocker, and 6 is an operation panel. Reference numeral 6a denotes a data input means arranged on the outer surface of the operation panel 6 and constituted by a numeric keypad or the like. With this data input means 6a, a set value D ₁ for judging whether the initial state is good or bad, a set value D ₂ for judging a miss shot and a life prediction are provided. The set value D ₃ is input and set in advance before the work.

Reference numeral 7 is a control unit provided on the operation panel 6 and is connected to the eddy current displacement sensor 2. Further, the control unit 7 is connected and provided with a computing unit, each memory and a comparator which will be described later. Then, the data input from the displacement sensor 2 to the control unit 7 for each punching shot is calculated by the calculator 7a, input to the history memory 7b, and sequentially updated as the latest history data.
The history data is updated after the input data D, which will be described later, and the previous history data D ₄ are compared. 7c is a memory for initial state determination that stores / updates the set value D ₁ for determining whether the initial state is good, and 7d indicates miss shot determination that stores / stores the set value D ₂ for miss shot determination. A memory, 7e is a life prediction memory in which the life prediction setting value D ₃ is set and stored so that it can be updated, and 7f is the input data D, the history data D ₄ , and the setting values D ₁ ,
A comparator that compares and predicts D ₂ and D ₃ , respectively.
Reference numeral 7g is a processing machine control section which outputs a signal for forcibly and instantaneously stopping the driving of the mold 1 to the molding machine drive section 9 in response to the output from the comparator 7f, and to the defective product discharging mechanism 8. The control signal is output and the punching failure indicator lamp 6c arranged on the operation panel 6 is turned on. Reference numeral 8 denotes a defective product discharging mechanism arranged immediately in front of the product stocker 5,
The defective product is appropriately discharged in response to the signal from the processing machine control section 7g. In addition, the set value D ₃ for life prediction and the history data D are input to the comparator 7f and a prediction signal indicating an abnormality output as a result of comparison is received and a mold provided at an easily recognizable position above the operation panel 6 is received. The life indicator lamp 6d is turned on to let the operator recognize that the mold (dies 1c and 1d) has reached the end of its life. It should be noted that, unlike the above case, only defective products may be discharged and the operation of the processing machine A may not be stopped when a defect is detected. Reference numeral 9 denotes a processing machine driving section 9 connected to the processing machine control section 7g, which instantaneously stops the processing machine A by the output from the comparator 7f.

The operation procedure of the die life predicting method and apparatus configured as described above will be described. That is, when performing the work of punching a thin sheet material M into a disk shape of a predetermined floppy disk using the press working machine A configured as described above, it is necessary to obtain the necessary work previously obtained as a pre-stage work of the press working work. Data, that is, the set value D ₁ for predicting whether the initial state is good or bad (set to adjust the alignment when the die 1c is mounted on the upper die 1a after resharpening), the set value D for life prediction
₃ (threshold value L ₁ shown on the graph of FIG. 11, this threshold value L ₁ is a value unique to each press working machine A, and in the case of this working machine A, it is −33 and this −33 value exceeds is a threshold L ₂ substantially life to be predicted) and missed shot determination setting value D ₂ (Similarly, when measured frequently, the threshold L ₂ also specific to each pressing unit a The value is -30 in the case of this processing machine A, and this -30
When a value that exceeds the value is measured or when a value that greatly differs from the value up to now is measured, it is determined to be various miss shots such as double hits). 6a to each corresponding memory 7c,
Input / set in 7d and 7e. After the above preparatory work, the sheet material M is loaded into the press working machine A, and the punching work is started. At this time,
By the eddy current type displacement sensor 2 attached to the upper mold 1a and the lower mold 1b in a pair, the moving amount of the die 1c descending per unit time during the minute time when the die 1c of the upper mold 1a is punching the sheet material M. Is measured (sampling)
The measured displacement amount is subjected to calculation (calculation of inclination) by the calculator 7a for each punching, and then the history memory 7b is obtained.
, And is sequentially updated and always stored as new history data. Then, this input data D is input to the comparator 7f, and the initial state determination memory 7c is also input to the comparator 7f.
initial abnormality warning lamp 6b when it is compared with the determined set value D ₁ of the initial quality came inputted to the f is abnormal
Lights up. (Refer to FIG. 5) Further, it is compared with the miss shot determination set value D ₂ input from the miss shot determination memory 7d or the previous input data D ₄ input from the history memory,
As a result, when it is determined that the shot is a miss shot, the punching failure indicator lamp 6c is turned on. (See FIG. 6) Further, the input data D input to the comparator 7f is the life prediction set value D ₃ input from the life prediction memory 7e.
When it is determined that the mold life is reached, an abnormal signal is emitted and the mold life indicator lamp 6d is turned on. When it is determined that the life has not yet expired, a normal signal is issued and the predicted life shot number display lamp 6e lights up. (See FIG. 7) As described above, since the life of the die 1c can be predicted, the die 1c can be re-sharpened without losing the timing, and the work is rationalized. As a result, the quality of the product W is stabilized without causing a bad burr on the edge of the punched product W.

Further, the set value D ₁ for judging whether the initial state is good or bad, which is set in the initial state judgment memory 7c, is used for the die 1c and the punch 1.
Since it can be preset as data corresponding to the initial position of d, the initial position can be adjusted surely and smoothly. FIG. 12 is a block diagram of the control unit 7 used in the second embodiment of the die life prediction method and the life prediction apparatus according to the present invention. The basic structure and operation of the main body of the press machine A and the like are similar to those of the first embodiment described above, and detailed description of the overlapping parts will be omitted.

That is, in the control unit 7, the output from the displacement sensor 2 provided in the press working machine A is sampled and then input to the arithmetic unit 11 via the A / D converter 10. In the calculator 11, the speed of the mold 1 is calculated by the timing signal (not shown) output for each shot, and the descending speed from the completion of cutting of the material M to the bottom dead center is obtained, and the gold for each shot is calculated. It is output as mold operation state data and stored in the memory 12.

In the comparator A, the mold operation state data and the data of the initial value memory 13 selected by SW1 are input and compared, and when it is determined to be abnormal, an abnormal signal 1 is issued. , SW2 is input to the processing machine drive unit 9 as an initial setting failure signal selected in conjunction with SW1 and the processing machine A is instantaneously stopped. Further, when the mold operating state data and the data of the life judging memory 14 selected by SW1 are inputted and compared and it is judged as abnormal, an abnormal signal 1
Is issued and a life end signal selected by SW2 in conjunction with SW1 is input to the mold life indicator lamp 6d to indicate that the mold 1 has reached the end of its life.

In the comparator B, the mold operation state data output from the arithmetic unit 11 and the memory 12 which was output last time are stored.
As will be described later, the mold operating state data stored is compared, and if the difference exceeds a certain value, an abnormal signal 2 is issued, and the SW3 outputs it as a punching failure signal to display a punching failure display. The lamp 6c is turned on. Even if the abnormal signal 2 is issued during the initial setting, the SW3 is not switched and the punching failure indicator lamp 6c is not turned on.

The comparison between the two comparators A and B is performed by inputting a comparison timing signal output from the arithmetic unit 11 to both the comparators A and B after the output of the arithmetic unit 11 is determined. Further, the normal signals 1 and 2 output from both comparators A and B are input to the AND gate 15, and the logical product is input to the memory 12 as a memory write signal, and the arithmetic unit output at that time is the mold operation state. The data is written and stored in the memory. The output from the computing unit 11 is held until the abnormal signals 1 and 2 or the normal signals 1 and 2 are output.

In order to simplify the structure of the control unit 7, the memory 12 and the comparator B are removed and the die life indicator 6d is used for both life determination and punching failure determination. There is no problem above. 13 to 15 relate to a third embodiment of the mold life predicting method and the life predicting apparatus according to the present invention. FIG. 13 is a block diagram in which the controller 7 is mainly composed of a computer, and FIG. FIG. 15 is a flow chart showing each operation, and FIG. 15 is an explanatory diagram for performing calculation for predicting the life of the mold.

The basic structure and operation of the main body of the press machine A and the like are substantially the same as those of the first and second embodiments described above, and the detailed description of the overlapping parts will be omitted. The outline of the configuration and operation will be described with reference to the block diagram of FIG. That is,
As a pre-work, initial setting values, defect detecting setting values, and life determining setting values are input into the computer device 22 from the data input means 6a of the operation panel 21 or other input means, and are stored / saved. .. Next, the output from the displacement sensor 2 of the driven press machine A is the displacement sensor I / F 23.
Is input to the computer device 22 and the output data is compared with the stored set values. As a result, a defective product discharge signal is output to the defective product discharge mechanism 8 and a processing machine drive stop signal is output to the processing machine drive unit 9 via the press processing machine I / F 24. Similarly, the output from the computer device 22 is output via the indicator light I / F 25 to the initial state abnormality warning lamp 6b, the punching failure indicator lamp 6c, and the die life indicator lamp 6d for display.

Next, a specific operation procedure will be described with reference to the flow chart of FIG. That is, the punching work is executed after inputting and setting the number of presses (the number of shots) to be performed by the data inputting means 6a, data is taken in from the displacement sensor 2 of the die 1 for each shot, and the speed / acceleration of Although the arithmetic processing is performed, it is judged whether the initial setting is good or bad in the case of the first time, and the press drive is stopped in the case of an abnormality. If normal, this normal data is written in the history memory. On the other hand, in the case of the second time or later, the life is judged, and in the case of an abnormality, the press drive is stopped. At this time, if it is set to predict the life of the press drive not to stop it immediately, the press drive is continued. (It should be noted that the calculation method of this life prediction will be described in detail later.) Further, in the case of normal operation, the punching failure is further determined. In this case, the sampled data and the computer device 22 are stored. The stored and saved average value data of several times up to the previous time is compared. In the case of abnormality, an abnormality signal is input to the defective product discharge mechanism 8 to discharge the defective product, and the punching defect display lamp 6c is turned on. Then, the punching work is continued again. If normal, this normal data is written in the history memory. When the number of presses (the number of shots) initially input and set is reached, the punching work is ended, and when the number is not reached, the punching work is continued again. When the data is compared, the computer 22 reads the data input to the displacement sensor I / F 23 one by one for each sampling, but a memory is stored in the displacement sensor I / F 23. Alternatively, all data for each shot may be stored and stored in the computer 22 after one pressing operation is completed. This configuration may be determined in consideration of the required sampling interval and the access cycle of the displacement sensor I / F 23 of the computer device 22.

Next, the calculation for predicting the life of the mold will be described with reference to the graph of FIG. That is, the relationship between the mold operation state value (speed) Y and the number of shots X is approximated to a straight line of Y = aX + b as shown in the figure from the accumulation of past data. (This relational expression is obtained by the least-squares method.) Specifically, if the shot of the captured data is the xth shot, the number of shots Δx until the life is reached is given by the following relational expression.

Δx ₁ = (L−b) / a−x [Number of Shots] Resharpening can be performed at a good timing by providing a warning when Δx ₁ becomes a value below a certain value. Furthermore, if you set the number of shots (L ₂ ) that gives this warning to the number of shots to be executed in one day, you can know the necessity of resharpening on the day before the end of life, and set an appropriate date and time. You can perform planned resharpening work.

If the taken operating state quantity is y, the shot number Δx ₂ until the life L is reached is given by the following relational expression. Δx ₂ = (L−y) / a [Number of shots] If Δx _{1 and} Δx ₂ are obtained by using the above two relational expressions, and either smaller value, that is, the one with a short life is adopted as the life prediction value, Safe and reliable life prediction can be performed, and the reliability of manufactured products is improved.

As described above, by constructing the life prediction calculation and the life prediction display in the software of the computer, that is, the program of the computer 22, the accurate mold 1 is obtained.
Re-sharpening work can be performed. Further, if the life prediction display is configured to be displayed in several stages (for example, different colors are used, identification is performed by the degree of blinking, etc.), it becomes easier for the operator to use.

Further, it is obvious that such an operation can be performed by using an arithmetic unit constituted by hardware instead of computer software.

[0035]

Since the present invention is configured as described above, when predicting the life of the mold, the displacement amount of the mold obtained by the measuring means is taken in to calculate the operation state amount and stored in advance. Since the life of the mold can be predicted by comparing it with the amount of operating state of the mold when the mold reaches the end of its life, the mold can be resharpened without missing the timing. As a result, the quality is stable without causing burrs or the like on the edges of the punched material. That is, as in the past, when determining the time to re-sharpen the die, a complicated visual inspection for microscopically determining the state of burrs on the edge of the punched product or an inspection using an optical microscope, etc. It is not necessary to carry out the inspection, automation and rationalization of the inspection can be achieved, and the inspection which cannot help relying on the experience and intuition of a skilled worker can be performed properly and promptly.

Further, it is possible to predict how many shots the life will be reached from the current operation state quantity by using the operation state quantity and the number of shots when the life of the mold is measured and stored in advance. And, for example, means for displaying the predicted value,
When a means for displaying a warning is provided when the predicted value reaches a certain value or less, reshaping of the mold can be performed preventively, and the quality of the punched material becomes more stable.

Further, the operating state quantity of the mold is determined by the moving distance of the mold,
The above-mentioned object can be achieved by using any one of the operation speed, the acceleration, the average speed from the hitting of the die to the material until the cutting is completed, or the speed from the completion of the cutting to the bottom dead center. Further, the means for storing the operation state amount when the initial position of the mold is normal allows the initial position of the mold to be set, for example, the alignment at the time of mounting after the mold resharpening can be surely and smoothly performed.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing an outline of a press machine for punching a sheet material into a predetermined shape in an FD (flexible disk) manufacturing process by a press machine that employs a die life prediction apparatus according to the present invention. is there.

FIG. 2 is an explanatory view showing a punching process of a sheet material in the same press working machine.

FIG. 3 is a front view of the same.

FIG. 4 is a block configuration diagram in the first embodiment.

FIG. 5 is a flowchart showing an operation process of predicting whether the initial state is good or bad.

FIG. 6 is a flowchart showing an operation process of performing miss shot prediction.

FIG. 7 is a flow chart showing an operation process of performing life prediction.

FIG. 8 is a graph in which the amount of vertical displacement of the die during punching is measured in a minute time.

FIG. 9 is a graph showing the relationship between the number of punches and the burr area.

FIG. 10 is a graph showing the relationship between the moving speed of the mold and the number of shots from the start to the end of cutting the sheet material.

FIG. 11 is a graph showing the relationship between the number of shots and the speed at which the load is released after the cutting, and the reaction is followed to drop the load.

FIG. 12 is a block diagram of a second embodiment.

FIG. 13 is a block diagram mainly showing a computer according to a third embodiment.

FIG. 14 is a flowchart showing each operation in the third embodiment.

FIG. 15 is an explanatory diagram for performing calculation for predicting the life of the mold in the third embodiment.

[Explanation of symbols]

 A Press machine M Sheet material 1a Die 2 Displacement sensor 6 Operation panel 7 Control section

Claims (10)

[Claims] 1. A method for predicting / determining the life of a die used in a press machine for punching a material into a predetermined shape, wherein the die operating state is measured at the time of punching the material, and the die is separately obtained in advance. A method for predicting / determining the life of a die, which comprises predicting the life of the die by comparing it with the operating state when the life of the die is reached. 2. A method for predicting / determining the life of a die used in a press machine for punching a material into a predetermined shape, which is associated with the number of shots of the die of the operation state amount of the die measured during the punching operation of the material. A method for predicting / determining the life of a die, which is characterized in that the number of remaining shots from the change until the operating state at the end of the die life is reached. 3. The method of predicting / determining the life of a mold according to claim 1, wherein the operating state quantity is a moving distance of the mold. 4. The method of predicting / determining the life of a mold according to claim 1, wherein the operating state quantity is the operating speed of the mold. 5. The life prediction of a mold according to claim 1, wherein the operation state quantity is acceleration of the mold.
Judgment method. 6. The life prediction / judgment of the die according to claim 1, wherein the operating state quantity is an average speed from the time the die contacts the material until the punching work is completed. Method. 7. The life of the mold according to claim 1, wherein the operating state quantity is a speed from immediately after the completion of punching of the material of the mold to the time when the mold reaches the bottom dead center. Prediction / judgment method. 8. A tool life prediction / determination apparatus used in a press machine for punching a material into a predetermined shape, comprising means for measuring the displacement of the die during material punching operation, and the displacement amount. An apparatus for predicting / determining the life of a mold, comprising: a unit for calculating an amount indicating an operating state; and a unit for storing the amount of the operating state when the die reaches the end of its life. 9. A device for predicting / determining the life of a mold used in a press machine for punching a material into a predetermined shape, comprising means for measuring the amount of displacement of the die during material punching operation, and the displacement amount. A means for calculating an amount indicating an operating state, a means for storing an operating state amount when the die reaches the end of its life, and / or a means for computing the number of shots until reaching the end of its life. Life prediction / determination device for molds. 10. A die life prediction / determination apparatus used in a press machine for punching a material into a predetermined shape, comprising:
Means for measuring the amount of displacement of the die during material punching operation, means for calculating an amount indicating the operating state from the amount of displacement, and storing the operating state of the die when the initial position of the die is normal And a device for predicting / determining life of a die.