JP2010029982A - Punching-position adjusting method for punching machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a punching-position adjusting method for a punching machine that can keep a punching load of a die in operation within a proper range. <P>SOLUTION: The punching-position adjusting method is used in the punching machine that moves up and down a lower surface plate 2 having a face plate thereon with respect to an upper surface plate 1 having a die therebelow thereby to punch a predetermined shape out of a sheet material flowing on the face plate. At each punching operation, a maximum value of the punching load is monitored. A control console 10 is provided to adjust a punching position by moving the lower surface plate up and down, and by inputting the proper load range of the die to the control console 10, the punching position is automatically set to an optimum position. Feedback control for the punching position of the die is performed so that the punching load in operation is kept within the proper load range. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention belongs to the technical field of a punching machine for punching a sheet material such as web-like paper or film into a product shape.

  Conventionally, a punching machine is used when a blank for assembling a paper box or the like is punched from a sheet material. This type of punching machine has a die and a face plate facing each other in the vertical direction, and a blank is punched from the sheet material by placing the sheet material on the face plate and pressing the die from above. .

  When blanks are punched from sheet materials using the punching machine as described above, uncut portions in the punching area called punching unevenness may occur. Such uncut portions affect product quality and operating efficiency. It is also a factor that lowers. Causes of the punching unevenness include deterioration of parallelism and surface accuracy of the upper surface plate to which the die is attached and the lower surface plate to which the face plate is attached, insufficient load due to poor setting of the punching position, and crushing of the die. Therefore, conventionally, so-called “unevenness removal” has been performed as a countermeasure for surface accuracy deterioration of the upper surface plate and the lower surface plate.

JP 2000-71198 A JP-A-2005-23280 JP-A-62-94297

  FIG. 1 is a schematic configuration diagram of a conventional punching machine, and FIG. 2 is a cross-sectional view showing a main part of the punching machine. As shown in these drawings, the punching machine has an upper surface plate 1 and a lower surface plate 2, and the lower surface plate 2 moves up and down by a crank mechanism 3 with respect to the fixed upper surface plate 1. ing. A die 5 is attached to the lower surface of the upper surface plate 1 via an unevenness mount 4, and a face plate 7 is attached to the upper surface of the lower surface plate 2 via a cushion material 6. The cutting die 5 is a base plate in which a cutting blade and a ruled line are fixed in a predetermined arrangement, and the face plate 6 has a flat receiving surface, but a groove is formed in a portion corresponding to the ruled line of the die 5. The

  When operating the above punching machine, the operator operates the handle 8 to shift the wedge to raise and lower the lower surface plate 2 together with the crank mechanism 4, thereby preliminarily setting a punching position that seems to be optimal. However, even if the punching position is accurately set, the unevenness mount 4 and the cushion material 6 interposed between the upper surface plate 1 and the lower surface plate 2 are gradually deteriorated during operation, and the die 5 and the face plate 7 are gradually deteriorated. And the punching load becomes smaller, and punching unevenness occurs. In addition, when an operation is performed with an overload due to an operator's position setting error, the die is crushed. For this reason, the operator is required to have a skill to set a punching position that is optimal for the punching punching load.

  On the other hand, regarding the bottom dead center position adjustment in the servo press, a mechanism for correcting the bottom dead center position of the slider with a servo motor from a detector of the press load and the slider movement amount has been proposed (for example, Japanese Patent No. 3692261). See the official gazette). However, in the punching machine, as shown in FIG. 1, the lower surface plate 2 moves up and down with a constant movement amount by the crank mechanism 3, and the punching speed per hour is as high as 5000 to 9000 shots. Therefore, this servo press machine technology cannot be diverted.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a punching position adjusting method for a punching machine that can keep the punching punching load during operation within an appropriate range. Is to provide.

  In order to achieve the above object, the present invention provides a punching machine that punches a sheet material flowing on a face plate into a predetermined shape by moving a lower face plate attached with a face plate up and down with respect to an upper face plate attached with a die. This is a punching position adjustment method that monitors the maximum punching load at each punching, and has a control panel for adjusting the punching position by moving the lower surface plate up and down. The punching position is automatically set to the optimal position by inputting the appropriate load range of the punching die on the panel, and the punching position of the punching die is feedback controlled so that the punching load during operation maintains the appropriate load range. It is characterized by that.

  According to the present invention, since it is not necessary for an operator to set and manage the punching position, the work load can be reduced and the skill of the operator can be reduced. In addition, inadequate load due to deterioration of inclusions such as unevenness mount and cushion material during operation, and mistakes in setting the punching position by the operator can be prevented. Therefore, it is possible to suppress a decrease in product quality and production efficiency.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 3 is a schematic configuration diagram showing an example of a punching machine for carrying out the present invention. This punching machine is similar to the punching machine of FIG. 1 in terms of mechanism, and has an upper surface plate 1 and a lower surface plate 2, and a lower surface plate 2 is a crank mechanism 3 with respect to the fixed upper surface plate 1. It is designed to move up and down. Similarly to FIG. 2, a die 5 is attached to the lower surface of the upper surface plate 1 via an unevenness mount 4, and a face plate 7 is attached to the upper surface of the lower surface plate 2 via a cushion material 6. . The cutting die 5 is a base plate in which a cutting blade and a ruled line are fixed in a predetermined arrangement, and the face plate 7 has a flat receiving surface, but a groove is formed in a portion corresponding to the ruled line of the die 5. The

  As shown in FIG. 3, the punching machine includes a control panel 10 for inputting an appropriate load of the punching die 5, a load meter 11 for monitoring the punching load during operation, and a punching position. An adjustment mechanism 12 for adjustment is provided. The load meter 11 is attached to the upper surface plate 1, and the punching load during operation is monitored from the control panel 10 as the maximum value at that time for each punching. The adjustment mechanism 12 includes a motor and is attached to the crank mechanism 3. The punching position is adjusted by moving the lower surface plate 2 up and down according to an instruction from the control panel 10.

  The procedure for setting the punching position performed when punching a sheet material using this punching machine will be described below.

  First, after the die 5 is installed in the punching machine, information on the die 5 is input to the control panel 10. Here, the range of the appropriate load of the cutting die 5 calculated by another system is input, but the control panel 10 is equipped with a system for calculating the appropriate load from the information (shape, blade length, CAD data, etc.) of the cutting die 5. Also good. As shown in FIG. 4A, the appropriate load is set to “maximum load: M” and “minimum load: N” applied to the die, or “appropriate” applied to the die as shown in FIG. 4B. Set “Load: A” and “Allowable range: ± B”. Further, the punching position at this point is automatically avoided at a position where the distance between the upper surface plate 1 and the lower surface plate 2 is maximized in order to prevent overload at the start of operation.

  After the input of the punching information is completed, the operation (blank operation) is started without flowing the sheet material on the face plate 7, and the punching load is within the proper load range while raising the lower surface plate 2 by the adjusting mechanism 12. To reach the position where the minimum value of is reached. The reason is as follows.

As shown from X to Y in FIG. 5, when the sheet material S on the face plate 7 is punched, the sheet material S is punched before the interval between the upper surface plate 1 and the lower surface plate 2 is minimized, and the upper surface plate is fixed. At the time when the interval between the platen 1 and the lower platen 2 is minimized, the sheet material S is the same. When this punching process is represented by a displacement-load curve as shown in FIG. 6, the actual punching load of the sheet material S appears as the _first maximum value P ₁ , and then the interval between the upper surface plate 1 and the lower surface plate 2. There appears as the maximum value P ₂ load of the second pressing of the cutting dies 5 and the face plate 7 when the minimum. The magnitude relationship between the _first maximum value P ₁ and the second maximum value P ₂ depends on the setting of the punching position. That is, P ₁ > P ₂ when the distance between the upper surface plate 1 and the lower surface plate 2 is narrow, and P ₁ <P ₂ when the distance between the upper surface plate 1 and the lower surface plate 2 is wide. Therefore, in order to satisfy the conditions for reliably punching the sheet material S without flowing the sheet material S, the punching load in the state where the sheet material S is not on the face plate 7 is set to be equal to or greater than the minimum value of the appropriate load range. What is necessary is just to set the extraction position.

  Thereafter, the sheet material S is flowed on the face plate 7, the actual punching load (maximum value in each punching) is compared with the input appropriate load range, and when the punching load is out of the proper load range, The adjustment mechanism 12 is driven by the control panel 10 so that the lower surface plate 2 is adjusted to the optimum punching position with respect to the upper surface plate 1. That is, when the punching load is larger than the maximum value of the appropriate load range, the lower surface plate 2 is lowered, and when the punching load is smaller than the minimum value of the appropriate load range, the lower surface plate 2 is raised and punched. Adjust the position.

  Here, when the adjusting mechanism 12 is driven during the punching process, the load applied to the motor increases because the load applied to the lower surface plate 2 is large. Therefore, the drive timing of the adjusting mechanism 12 is set only in a region where the interval (platen interval) between the upper surface plate 1 and the lower surface plate 2 is wide as shown in FIG. Better. The distance between the upper surface plate 1 and the lower surface plate 2 is detected by installing a displacement meter between them or by rotating the crankshaft. Further, the drive amount (position adjustment amount) of the motor may be calculated as a drive amount corresponding to the load difference based on data obtained in advance from the rigidity curve of the punching machine.

  The purpose of operating the sheet material S without flowing it on the face plate 7 after inputting the punching information is to reduce the number of sheets used for punching conditions. Therefore, if the number of sheets for condition setting is not particular, the punching position may be adjusted while the sheet material S is flowed on the face plate 7 after inputting the die cutting information.

  As the punching position control mode, as described above, the load is constantly monitored and the position is adjusted, and the hold mode is used to control the position until the initial production stage when the sheet material starts to flow, and then the position control is canceled. There are modes for the operator to set the punching position from the beginning as a mode to perform and a manual mode, and can be switched to each mode.

  The embodiment of the present invention has been described in detail above. However, the punching position adjusting method of the punching machine according to the present invention is not limited to the above-described embodiment, and does not depart from the spirit of the present invention. Of course, various changes can be made.

It is a schematic block diagram of the conventional punching machine. It is sectional drawing which shows the principal part of the punching machine of FIG. It is a schematic block diagram which shows an example of the punching machine which implements this invention. It is explanatory drawing which shows the input of the appropriate load range with respect to a control panel. It is explanatory drawing which shows the mode of the punching of the sheet material by a punching machine. It is a displacement-load curve in the punching process of the sheet material by a punching machine. It is a graph which shows the space | interval of the upper surface plate and the lower surface plate at the time of punching.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper surface plate 2 Lower surface plate 3 Crank mechanism 4 Unevenness mounting board 5 Punching die 6 Cushion material 7 Face plate 10 Control panel 11 Load meter 12 Adjustment mechanism

Claims (3)

  A punching position adjustment method for a punching machine for punching a sheet material flowing on a face plate into a predetermined shape by moving a lower surface plate attached with a face plate up and down relative to an upper surface plate attached with a punching die. The maximum value of the punching load at that time is monitored, a control panel is provided to adjust the punching position by moving the lower surface plate up and down, and the appropriate load range of the punching die is input to the control panel. The punching position adjustment of the punching machine is characterized by automatically setting the punching position to the optimum position and performing feedback control of the punching position of the punching die so that the punching load during operation is maintained within the appropriate load range. Method.   2. The punching position adjusting method for a punching machine according to claim 1, wherein a maximum load and a minimum load applied to the punching die are input as an appropriate load range.   2. The punching position adjusting method for a punching machine according to claim 1, wherein an appropriate load and an allowable range for die cutting are input as the appropriate load range.

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