JPH04279300A - Controller of punch press machine - Google Patents

Abstract

PURPOSE:To rapidly and automatically recover it on the time that the stop position of the crank shaft is separated from the top dead center. CONSTITUTION:When the stopping angle of the crank shaft 15 is separated from the top dead center, the blank punching control means 32 to execute the null punching at the punched hole position being machined is set. That is, the coordinate of the punching time is stored always at the proceeding working coordinate storing means 27 until the completion of the work feed for the next punching. When the separation from the top dead center is generated, the coordinate stored at the proceeding working coordinate storing means 27 is positioned again with the blank punching control means 32, the blank punching is executed by one punch. With this blank punching, it returns to the top dead center generally.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a crank type punch press machine that performs numerical control.

0002

2. Description of the Related Art In a crank-type punch press machine, the rotation of a flywheel that is constantly rotated by a press motor is transmitted to a crankshaft via a hydraulic clutch brake to move a punch tool up and down. The crankshaft is stopped at the top dead center for each punching operation by turning on and off the clutch brake, and the workpiece is fed during this period.

A punch press machine equipped with a numerical control device repeatedly performs the above operations by executing a machining program.

0004

Due to deterioration of the brake pad in the clutch brake or various other factors, the stopping angle of the crankshaft may deviate from the top dead center during execution of a machining program. When the crankshaft deviates from the top dead center and stops in this way, if the next punching operation is continued without any change, processing defects may occur.

[0005] Conventionally, therefore, when the stop angle deviates from the top dead center, an alarm is displayed and the operator manually returns the crankshaft to the top dead center.

[0006] However, depending on the operator's operation, there are problems in that it takes time to restart operation, lowering the operating rate and impeding unmanned operation.

[0007] For this reason, we have proposed a control device that automatically repairs the workpiece, when it is detected that the workpiece has deviated from the top dead center, returns the workpiece to its original position where the entire workpiece is deviated from the punching position, and performs blank punching. If you perform one blank shot like this,
In most cases, it returns to top dead center.

However, returning the workpiece to the origin position
When punching is performed at a location far from the original position, there is a problem in that it takes time to return the workpiece to the original position and to feed the workpiece for the next punch.

An object of the present invention is to provide a control device for a punch press machine that can quickly and automatically restore the crankshaft stop position when it deviates from the top dead center.

0010

[Means for Solving the Problems] The structure of the present invention will be explained with reference to FIG. 1 corresponding to an embodiment. The control device for this punch press machine is provided with a blank punching control means (32) that causes blank punching to be performed at the punched hole position immediately after the punch press leaves the top dead center.

That is, the workpiece feeding mechanism (1
A pre-processing coordinate storage means (27) is provided to store the coordinate values of 3) until the work is fed for the next punching process, and the stopping angle of the crankshaft (15) is out of the top dead center range after punching. Top dead center return confirmation means (34) that detects
will be established. The blank firing control means (32) is configured to control the checking means (
In response to the disconnection detection signal (a) of the crankshaft (15), an axis feed command is given to the workpiece feed mechanism (13) to return it to the memorized coordinate position of the pre-processing coordinate storage means (27), and the crankshaft (15)
), a punch command is given to the clutch brake (19).

0012

[Operation] According to this configuration, the coordinate values of the workpiece feeding mechanism (13) during each punch performed sequentially are stored in the pre-processing coordinate storage means (13) until the workpiece feeding for the next punching process is completed.
7). If the stopping angle of the crankshaft (15) is out of the top dead center range, the top dead center return confirmation means (34
), and the deviation detection signal (a) is sent to the blank firing control means (32). When the removal is detected, the feeding of the workpiece for the next punching process has usually already started, and the punched hole has already moved from the punching position.

The idle striking control means (32) responds to the detachment confirmation signal (a) and gives an axis feed command to the workpiece feeding mechanism (13) to return it to the coordinate position stored in the pre-machining coordinate storage means (27). As a result, the punched hole from the previous punching process is returned to the punching position. A blank punching operation is performed in this punch hole. Dry firing will usually return you to top dead center. After this, punching continues.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 2 is a plan view of a turret punch press to which the present invention is applied. A turret 2 is provided on a frame 1, and a work table 3 is arranged in front of the turret 2. The work table 3 consists of a fixed table 3a at the center and slide tables 3b on both sides thereof, and the slide tables 3b move back and forth (in the Y-axis direction) together with the carriage 4 on the rails 6 of the bed 5. A cross slide 7 is mounted on the carriage 4 so as to be movable laterally (in the X-axis direction), and a work holder 8 for gripping a work W is attached to the cross slide 7.

The cross slide 7 and carriage 4 are
They are driven forward and backward by an X-axis servo motor 11 and a Y-axis servo motor 12 via feed screws 9 and 10, respectively. With these work holder 8 and servo motors 11, 12, etc.,
A workpiece feeding mechanism 13 is configured.

As shown in FIG. 3, a crank mechanism 14 for driving a punch at a punching position P is installed at the top of the frame 1.

Referring to FIG. 1, the crank mechanism 14 will be explained. Pitman 1 attached to the crankshaft 15 and moving up and down
6, a punch tool 18 of the turret 2 is connected via a ram 17. A flywheel 20 is connected to the crankshaft 15 via a hydraulic clutch brake 19, and the flywheel 20 is constantly driven to rotate by a press motor (not shown) via a belt hung around its outer periphery. . The clutch brake 19 is an electromagnetic clutch valve 21
The on/off control is controlled by An angle detector 22 consisting of a rotary encoder is connected to the crankshaft 15.

The control system will be explained. First, I will explain the outline. The numerical control device 23 includes an arithmetic control section 26 that analyzes and executes a machining program read from a machining program memory 24 or a tape reader 25, and a pre-machining coordinate storage means 2.
7. The arithmetic control unit 26 includes a CPU, a system memory, etc., and includes a servo controller 2 that drives the servo motors 11 and 12 for each axis of the workpiece feeding mechanism 13.
At the same time, the sequence code of the machining program is transferred to the programmable controller 29.

The programmable controller 29 performs sequence control of the entire punch press, and includes a punch command means 33 for controlling the clutch valve 21 of the crank mechanism 14, a top dead center return confirmation means 34, and a pre-processing T code storage means. It is equipped with 35. Top dead center return confirmation means 3
4 is the crankshaft 15 based on the angle detected by the angle detector 22.
This is means for confirming that the stop angle of is within the top dead center range A (FIG. 4), and when it is outside the top dead center range A, outputs a deviation detection signal a. The pre-processing T-code storage means 35 stores data until the workpiece feeding for the next punch processing is completed.
This is means for storing a T code which is an index command for the turret 2.

The details of the calculation control section 26 will be explained. The arithmetic control unit 26 includes a positioning completion determination unit 30 that determines the completion of positioning of the workpiece W based on the completion of pulse delivery of the axis drive command, and an execution block coordinate system that stores the X-axis and Y-axis coordinate values of the currently executed block of the machining program. Storage means 3
1 and a blank firing control means 32. In response to the deviation detection signal a from the top dead center return confirmation means 34, the blank punching control means 32 gives an axis feed command for the memorized coordinate position of the pre-processing coordinate storage means 27 to the servo controller 28, and also sends the punch command means 33 This is means for giving a punch command by turning the clutch brake 19 on and off.

The pre-processing coordinate storage means 27 is a means for storing the X and Y coordinate positions of the workpiece feeding mechanism 13 during punching, and updates the stored contents in response to a completion judgment signal from the positioning completion judgment means 30. . The pre-machining coordinate storage means 27 may store calculated coordinate values from the machining program stored in the execution block coordinate storage means 31, or may store the coordinate values calculated from the machining program stored in the execution block coordinate storage means 31. It is also possible to store the detected value of (1). In addition,
Preferably, the pre-processing coordinate storage means 27 stores absolute coordinates.

Next, the operation of the above configuration will be explained. Each block of the machining program is sequentially executed by the arithmetic control unit 26, and as a result, each part of the workpiece W is sequentially positioned by the workpiece feed mechanism 13 and punched by the drive of the crank mechanism 14. In this case, the coordinate values of the workpiece feeding mechanism 13 during each punching are constantly stored in the pre-processing coordinate storage means 27 until the workpiece feeding for the next punching process is completed.

Punching is performed when the crankshaft 15 is stopped in the top dead center range A indicated by diagonal lines in FIG.
This is done by transmitting the rotation to the crankshaft 15. After this, at a predetermined brake angle BK, the clutch brake 19
By disengaging the clutch (brake on), the crankshaft 15 rotates due to inertia and stops in the top dead center range A. The top dead center range A is, for example, −25°≦from the top dead center TDC.
The top dead center return confirmation means 34 is set so that the angle θ is within the range of θ°≦25°.

[0024] Workpiece feed for the next punching process is as follows:
In order to shorten the cycle time, the process starts while the crankshaft 15 is rotating upward.

[0025] In the process of repeating such punch processing,
When the stop angle of the crankshaft 15 deviates from the top dead center range A, it is detected by the top dead center return confirmation means 34, and the deviation detection signal a is sent to the blank firing control means 32.

The blank striking control means 32 controls the servo controller 28 of the workpiece feeding mechanism 13 in response to the detachment detection signal a.
An axis feed command for the coordinate position stored in the pre-machining coordinate storage means 27 is given to. As a result, the punched hole H (FIG. 5) at the time of the previous punching process is returned to the punching position P. In this punch hole H, one blank punch is performed using the punch tool 18. This one punch will usually return you to top dead center. If it does not return, repeat the blank firing. After this, the remaining program portions of the machining program are subsequently executed.

[0027] If the T code is different between the previous punching process and the next punching process, the punch tool 18 used in the immediately previous punching process is determined based on the T code stored in the previous processing T code storage means 35. In this state, perform the above-mentioned blank firing.

The control device of this punch press machine is configured so that when the stop angle deviates from the top dead center range A as described above, the position of the immediately previous punch hole H is returned to the punch position P to perform blank punching. Therefore, the deviation in the stopping angle can be automatically corrected and machining can be continued. Moreover, the punch hole H just before
Therefore, compared to the case where the work W is returned to the origin so that the entire work W is removed from the punch position P, the workpiece feeding distance for the repair operation is shorter, and the repair can be performed quickly.

Although the pre-processing T code storage means 35 is provided in the above embodiment, even in a turret punch press, the pre-processing T code may not always be stored depending on the timing of the indexing operation, etc.
There is no need to provide code storage means 35. Furthermore, the present invention is applicable not only to turret punch presses but also to control of punch press machines in general. The clutch brake 19 may be provided with a clutch and a brake independently.

[0030]

Effects of the Invention The control device for a punch press machine of the present invention is provided with a pre-processing coordinate storage means and a blank punching control means, and when the stopping angle of the crankshaft deviates from the top dead center, the position of the immediately previous punch hole is changed. Since the tool returns to the punching position and performs blank punching, it is possible to automatically repair the deviation in the stop angle and continue machining.Moreover, the workpiece feed distance associated with the repair operation is short, allowing for quick repair. It has the effect of being able to.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a plan view of the punch press machine of the same embodiment.

FIG. 3 is a side view of the punch press machine.

FIG. 4 is an explanatory diagram of the crank angle.

FIG. 5 is an explanatory diagram of the operation.

[Explanation of symbols]

Claims (1)

[Claims] 1. Pre-processing coordinate storage means for storing coordinate values of a workpiece feeding mechanism during punching until completion of feeding the workpiece for the next punching process, and a crankshaft whose stopping angle is increased by a clutch brake after punching. top dead center return confirmation means for detecting deviation from the dead center range, and an axis feed command for returning the axis to the memorized coordinate position of the pre-machining coordinate storage means to the workpiece feeding mechanism in response to a deviation detection signal from the confirmation means. A control device for a punch press machine, comprising blank punch control means for giving a punch command to the clutch brake.