JPH1157881A - Processing control method for bending work in punch press machine and control device for practicing it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always perform the normal punching processing and drawing processing even if the bending part exists in the work by interrupting the processing in the case of the processing, wherein the die enters a dead zone. The zone where the bending part of the bending work and the die are interfered (bending dead zone) is detected in advance. SOLUTION: Before the punch processing or the drawing processing is performed to a bending work W4 which is bending processed in advance, the die data, the data of the bending work W4, and the data of the bending part are input to a data input part of the bending dead zone. Then, the data that the zone where the die and the bending part are interfered each other is considered as the bending dead zone, is formed so as to store it in a storage part. On the other hand, the data of the positioning point against the die of the work W4 and the data of the rising position of the die are calculated and formed at an arithmetic logical unit of the target moving position. The data of the bending dead zone and the data of the target moving position of the work W4 are collated in advance of the processing operation, so as to control the up/down movement of a ram 1 by a ram control part and the movement of a shaft by a shaft control part respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punch press for a bent work, such as a control panel door, which is generally used in a punch press capable of positioning a work arbitrarily using a mold. The present invention relates to a control method and a control device for performing the method.

[0002]

2. Description of the Related Art In a conventional punch press machine, punching is performed while a workpiece is fixed to a clamp. Therefore, a clamp dead zone is set as a punch-inhibited area so that a punch die does not interfere with the clamp. To prevent punching in the zone.

[0003] Further, in the conventional punching, punching and drawing of a flat work are premised, and therefore, as shown in FIGS. No special consideration has been given to the bent part in. For this reason, even if there is a previously bent part in the work, the processing can be continued as it is, so that the bent part interferes with the punch die and damages the bent part,
There was a risk of damaging the mold. 1 to 4
, The bent work W1 has four cross sections L on the four sides of the square sheet metal A.
Which was subjected to shape bending b _1, W2 are those subjected to a cross-sectional L-shaped bent b ₁ to a set of two opposed sides of the sheet metal A, also the bending work W3 cross section U in four sides of the sheet metal A that has been subjected to a shape bending b _2, W4 is obtained by subjecting the shaped bend b ₂ of the cross section U in a set of two opposed sides of the sheet metal a.

On the other hand, in order to perform punching at high speed,
The shorter the moving distance of the ram (return stroke amount or rising amount), the better the processing efficiency. Therefore, as shown in FIG. 5, the lower surface P of the mold 2 being processed is controlled so as to rise only to a position closer to the upper surface of the bent workpiece W4 (hereinafter, referred to as an intermediate top dead center mDp). When the mold 2 at a height intermediate the top dead center is moved relative to the workpiece W4, the bent portion of the die 2 and the bending work W4 when passing through the bent portion b ₂
b ₂ interferes. To avoid this, if the middle top dead center mDp of the ram is always raised to the top dead center uDp in FIG. 5, the number of punching operations per unit time is reduced, and the processing efficiency is impaired. In FIG. 5, reference numeral 1 denotes a ram of a punch press, 2 denotes a punch die mounted on a lower portion of the ram 1, and 3 denotes a die die disposed on the lower surface of the bent work W4.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned prior art, and has been described in view of the fact that a bent portion and a mold do not always interfere with a bent workpiece that has been subjected to a bending process in advance.
An object of the present invention is to provide a method for controlling a punch press machine and a control device for performing the method so that punching or drawing can be performed.

[0006]

Means for Solving the Problems The control method according to the present invention, which has been made to solve the above-described problems, is intended to perform punching or drawing on a bent workpiece such as a sheet metal that has been previously bent. Before machining, a region where the bent portion of the bent workpiece and the mold interfere with each other (hereinafter, referred to as a bending dead zone) is detected in advance from the mold data, machining data, and the like, and the mold enters the dead zone at the time of machining. The processing is characterized in that the processing is interrupted so as to avoid processing on the bent portion of the bent work or deformation of the bent portion. In the present invention, when it is detected that the mold enters the bending dead zone, an alarm may be issued to interrupt the processing.

Another configuration of the control method according to the present invention is such that, when punching or drawing is performed on a bent workpiece such as a sheet metal which has been bent in advance, a bent portion of the bent workpiece and a metal are formed before the bending. The bending dead zone where the mold interferes is detected in advance, and at the time of machining, when the mold enters the dead zone, by raising the ram to prevent the mold from interfering with the bent portion of the bending work. The present invention is characterized in that deformation of a bent portion of the bending work is avoided.

[0008] Still another control method of the present invention is a work holder which presses a bent work before operating the reposition function in a punch press machine having a work gripping function (hereinafter, referred to as a reposition function). By detecting a bending dead zone where the support area of the work and the bent portion of the work interfere with each other, and re-holding the bent work, interrupting the re-gripping when the support area of the work holder enters the bending dead zone, the bending work is stopped. This is characterized in that deformation of the bent portion is avoided. In the present invention, an alarm may be issued when it is detected that the work holder enters the bending dead zone.

On the other hand, the configuration of a control device for carrying out the control method of the present invention includes a bending dead zone data input section into which machining data and mold data including bending section data are input, and a data input section for the input section. Bending dead zone data storage unit that stores the input data, target movement position calculation unit that calculates the target movement position of the work, and data input from the data storage unit and target position calculation unit for processing. Bending dead zone which calculates and detects whether or not the mold enters the bending dead zone before machining, interference detection part of the mold or work holder, and control of ram up and down by data obtained by the interference detection part And a shaft controller for controlling the axis movement of the work clamp. This device may be provided with an alarm output unit that outputs an alarm as needed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to a block diagram and a flowchart of a control device for implementing the method of the present invention.

In FIG. 7, reference numeral 11 denotes a bending dead zone in which data such as dimensions of a bent work including data of a bent portion and data such as mold data used for machining are input in order to calculate a bending dead zone. Data input, 12
Is a storage unit for bending dead zone data that stores information input to the data input unit 11 for the bending dead zone, 13 is a target movement position calculation unit that calculates a target movement position of a workpiece during machining, and 14 is the storage unit. Data is input from the target position calculation unit 11 and the target position calculation unit 12 to calculate and detect whether or not the planned position (elevated position, relative position on the work) of the mold interferes with the bending dead zone during processing. The interference detection unit between the zone and the mold, 15 receives the interference data obtained in the interference detection unit 14 between the bending dead zone and the mold, and a ram control unit that controls the raising and lowering of the ram as necessary, 16 is the ram control unit. Similarly to the ram control unit 15, an axis control unit that inputs the interference data obtained in the bending dead zone detection unit 14 and controls the position of the clamp as necessary, and 17 is an alarm output unit that also outputs an alarm as necessary. .

That is, according to the method of the present invention, when punching or drawing is performed on a bent workpiece that has been subjected to bending in advance, the die data, the data of the bent workpiece, and the data of the bent portion (the bent portion) Plane width, height (Z axis), etc.)
Is input to the data input section 11 of the bending dead zone to form data that sets a region where a die used during punching or drawing processing interferes with the bending portion as a bending dead zone, and this data is bent. While the dead zone is stored in the dead zone storage unit 12, the calculation unit 13 of the target movement position
The target moving position of the work, that is, the data of the positioning point of the work with respect to the mold and the data of the ascending position of the mold are calculated and formed, and the bending dead zone and the interference detection unit 14 of the mold form the bending dead zone. The data of the bending dead zone and the data of the target moving position of the work input from the data storage unit 12 and the target position calculation unit 13 are stored before the ram and the work clamp are all processed, or Before each machining operation, the collation is performed in advance, and whether or not the mold may enter the bending dead zone is calculated and detected for each machining operation one by one, and the information of the detection result is detected by the ram control unit 15 and the axis. Output to the control unit 16 and the alarm output unit 17, respectively,
The ram control unit 15 controls the raising and lowering of the ram, and the axis control unit 16 controls the movement of the axis of the work clamp. With this, if it is detected in advance that the mold enters the bending dead zone before machining, the machining operation of the ram and the work holder is stopped before the machining, or the ram is raised to the top dead center uDp and The interference of the bent portion can be avoided. Note that, when it is detected that the mold enters the bending dead zone, it is desirable to control the alarm output unit 17 to generate an alarm before or at the same time as the processing is stopped.

An example of the process for detecting the presence / absence of interference between the bending dead zone and the mold will now be described with reference to the flowchart of FIG. That is, in the interference detection unit 14 that detects the interference between the bending dead zone and the mold, in Step S1, the work "whether or not the bent portion passes under the ram (or the mold) when moved to the target movement position". And determine
If the result of the determination is "pass", the ram control unit
When 15 is activated and the ram is raised to the top dead center uDp in step S2 to move the work, and
The process proceeds to the next step S3 without raising the ram, where it is determined whether or not punching or drawing is to be performed on the bent portion. If the determination result is that processing is to be performed, an alarm output unit When 17 is activated, an alarm is issued, machining is stopped, and when `` the machining is not to be performed '', the ram control unit 15 and the axis control unit 16 perform operations necessary for the machining, assuming that the machining is to be executed. is there.

In a punch press equipped with a repositioning function, the interference between the repositioning (at the time of gripping) is the bent portion of the bent work and the work holder or the work holder. Prior to the repositioning (re-grabbing) operation, avoidance is performed in advance by a method similar to the above-described method.

[0015]

According to the present invention, as described above, when punching or drawing is performed on a bent work, data of a bending dead zone where a bent portion of the bent work interferes with a mold is formed before processing. When the workpiece is moved to the target position during processing, it is determined in advance whether or not a die for punching or drawing may enter the bending dead zone, and if it is detected that the die enters the bending dead zone, Interrupting the processing with or without an alarm, or
By raising the ram to move the axis of the work clamp, it is possible to prevent the mold from interfering with the bent portion of the bent work in advance, so that the mold is moved to the bent portion of the bent work. It is possible to avoid punching or drawing, and to avoid deformation of a bent portion. Therefore, even if a work has a bent portion, normal punching and drawing can be always performed.

In a punch press having a repositioning function, the position of the work holder or the work holder can be controlled so as not to interfere with the bent portion during repositioning. To
It is possible to prevent the work holder or the work holder from pressing the bent part of the bent work, and therefore, even if the work has a bent part, it is possible to prevent the bent part of the work from being pressed and deformed during gripping. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first example of a bending work to which the present invention is applied.

FIG. 2 is a perspective view of a second example of a bending work to which the present invention is applied.

FIG. 3 is a perspective view of a third example of a bending work to which the present invention is applied.

FIG. 4 is a perspective view of a fourth example of a bending work to which the present invention is applied.

FIG. 5 is a front sectional view showing a relationship between a ram and a bent work of the punch press machine.

FIG. 6 is a flowchart for detecting interference between a bending dead zone and a mold according to the present invention.

FIG. 7 is a functional block diagram of an example of the control device of the present invention.

[Explanation of symbols]

W1, W2, W3, W4 bending work b ₁ L-shaped bend b ₂ U bend 1 punch press ram 2 punch tool 3 die tool 11 bent storage unit of the dead zone data bending data input section 12 of the dead zone 13 Target movement position calculation unit 14 Bending dead zone and die interference detection unit 15 Ram control unit 16 Work clamp axis control unit 17 Alarm output unit

Claims (4)

[Claims] When performing punching or drawing on a bent workpiece such as a sheet metal which has been subjected to bending in advance, interference between the bent portion of the bent workpiece and the die based on die data, processing data and the like before processing. A region to be bent (hereinafter referred to as a bending dead zone) is detected in advance, and at the time of processing, the processing is interrupted in the processing in which the mold enters the dead zone, whereby the bending of the bending work to the bending portion or the bending portion is performed. A method for controlling the processing of a bent work in a punch press, characterized by avoiding deformation. 2. When performing punching or drawing on a bent workpiece such as a sheet metal that has been subjected to bending in advance, a bending dead zone where a bent portion of the bent workpiece and a mold interfere with each other is detected before processing. At the time of machining, in the machining in which the mold enters the dead zone, the deformation of the bent portion of the bent work is avoided by raising the ram to prevent the mold from interfering with the bent portion of the bent work. A method for controlling the working of a bent workpiece in a punch press machine. 3. A punch press machine having a work gripping function (hereinafter referred to as a repositioning function).
Before activating the repositioning function, a bending dead zone where the support area of the work holder that holds the bending work and the bending portion of the work interfere with each other in advance is detected. A method for controlling the working of a bent work in a punch press machine, wherein the gripping is interrupted when entering a dead zone to avoid deformation of a bent portion of the bent work. 4. A bending dead zone data input section for inputting machining data and mold data including bending section data, and a bending dead zone data storage section for storing the data input to the input section. A target moving position calculating unit for calculating a target moving position of a work, and data before inputting data from the data storage unit and the target position calculating unit to determine whether or not a mold enters a bending dead zone during processing before processing. Bending dead zone which is calculated and detected, an interference detection unit of a mold or a work holder, a ram control unit for controlling the raising and lowering of a ram based on data obtained by the interference detection unit, and an axis control unit for controlling the axis movement of the work clamp. A processing control device for a bent work in a punch press machine, characterized by comprising: