JPH07156000A - Device for controlling punching command output timing - Google Patents

Abstract

PURPOSE:To provide excellent precision and excellent hit rate even when the thickness of plates is changed in a punch press. CONSTITUTION:A timing control device is provided with a punching command means 27 to output the punching command PF before the set time of a timer earlier than the time when the shaft position determination of a shaft feeding control means 26 is completed. The shaft feeding control means 26 outputs the command pulse to a work feeding mechanism 13, and the completion of the shaft position determination is preliminarily recognized. This control device is provided with a table 30 to set the timer time corresponding to each plate thickness and a selecting means 29 to select the timer time of the table 30 according to the plate thickness data D of the working program 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punch command output timing control device for an NC punch press machine.

[0002]

2. Description of the Related Art A control device for a punch press has a function of outputting a punch command after completion of axial positioning of a work feed, and the punch command timing can be output even before completion of axial positioning. In addition, there is a system in which the time before completion of positioning can be separately set depending on the stage of the axis positioning distance. By issuing the punch command before the completion of the axis positioning in this way, the time from the start of the descent of the punch tool to the actual contact with the work is saved, and a high hit rate can be obtained.

[0003]

However, there are various thicknesses of the work, and if the time before the completion of positioning is set in accordance with the thick thickness, a sufficient hit rate can be obtained for a work with a thin thickness. It is not possible to improve, and if the time is set according to the thin plate thickness, in the case of thick plate work,
The punch tool actually hits the work before the positioning is completed, and high-precision machining cannot be performed.

An object of the present invention is to provide a punch command output timing control device which can obtain a high precision and a high hit rate even if the plate thickness changes.

[0005]

The structure of the present invention will be described with reference to FIG. 1 corresponding to an embodiment. The control device of the present invention is capable of recognizing the completion of axis positioning of the work feed mechanism (13) of the punch press before completion.
6) and a punch command (P) is issued to the punch drive mechanism (14) before the completion of the axis positioning and before the set time of the timer (28).
It is applied to a punch command output timing control device having a punch command means (27) for outputting F). In this apparatus, a table (30) in which corresponding timer times for various plate thicknesses are set and the table (3) according to the plate thickness data are set.
A selection means (29) for selecting the timer time of 0) and setting it in the timer (28) is provided.

[0006]

The punch command means (27) is responsive to the positioning completion data obtained from the axis feed control means (26).
The punch command (PF) is output before the completion of the setting and before the set time of the timer (28). According to the plate thickness, the selection means (29) selects the set value of the table (30) according to the plate thickness data (D) of the machining program (24) or the like at the set time of the timer (28). Time is set. Therefore, even if the plate thickness changes, the punching operation can be started at the timing when the punch tool (14) has already descended from the upper surface of the work (W) to the predetermined proximity height when the axis positioning is completed. Therefore, high accuracy and high hit rate can be realized regardless of the plate thickness.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a plan view of a turret type punch press machine to which the present invention is applied. Turret 2 on frame 1
Is provided, and the work table 3 is arranged in front of it.
The work table 3 includes a fixed table 3a at the center and slide tables 3b on both sides.
b moves forward and backward (Y-axis direction) on the rail 6 of the bed 5 together with the carriage 4. A cross slide 7 is mounted on the carriage 4 so as to be movable laterally (X-axis direction), and the work W
A work holder 8 for gripping is attached to the cross slide 7. The cross slide 7 and the carriage 4 are
It is driven back and forth by an X-axis servomotor 11 and a Y-axis servomotor 12 via feed screws 9 and 10, respectively. These work table 3, work holder 8, and servo motor 1
The work feed mechanism 13 is configured by 1, 12, and the like.

As shown in FIG. 3, a crank type punch driving mechanism 14 for driving the punch at the punch position P is installed on the upper portion of the frame 1. This punch drive mechanism 14
As shown in FIG. 1, the turret 2 is attached to a pitman 16 mounted on a crankshaft 15 and moved up and down via a ram 17.
The punching tool 18 is connected. Crankshaft 1
A flywheel 20 is connected to 5 via a hydraulic clutch brake 19, and the flywheel 20 is constantly rotationally driven by a press motor (not shown) via a belt wound around the outer circumference. The clutch brake 19 is controlled to be turned on / off by an electromagnetic clutch valve 21.

The control system will be described. The control device 23 controls the entire punch press machine, and includes a CNC device (computer type numerical control device) and a PMC device (programmable machine controller). The control unit 23 is provided with a command decoding conversion unit 25, a shaft feed control unit 26, a punch command unit 27, a selection unit 29, and a plate thickness / time correspondence table 30 by its arithmetic control unit and a memory device.

The instruction decoding conversion means 25 reads the processing program 24 consisting of NC code and outputs the instruction (R1 to R1).
R3) and axis feed control means 2 according to the type of data (D)
6 and punch command means 27 and the like, and is a means for converting a compound command such as the pattern function command R3 into a plurality of single commands while transferring the command and data. The pattern function command is, for example, a command for punching a plurality of punches at a predetermined pitch along a straight line or a predetermined curve, and this command is converted into a feed command for each punch and a punch command to sequentially perform the axial feed control means. Two
6 and punch command means 27.

The axis feed control means 26 uses the machining program 2
According to the axis feed command R1 of 4 and the axis feed command obtained by converting the pattern function command R3, a velocity curve for trapezoidal control or the like is generated according to the moving distance and the like, and the axis feed operation of the velocity curve is performed. A command pulse is generated so that it can be obtained. Therefore, the axis feed control means 26 recognizes when the axis positioning is completed, which corresponds to the end of the output of the command pulse. The axis feed control means 26 outputs command pulses for the two X and Y axes.

The servo controller 31 is a digital type which performs feedback control, and gives an axis feed command to each axis servomotor 11, 12 in accordance with a deviation between the command pulse of the axis feed control means 26 and the feedback pulse. Although the servo controller 31 is shown as one block, it is provided for each of the X and Y axes. Further, in order to detect a feed error, a means (not shown) is provided for generating an alarm (not shown) when the accumulated pulse of the servo controller 31 exceeds a predetermined value.

The punch command means 27 is used for the machining program 2
When there is a punch command R2 of 4 or a punch command obtained by converting the pattern function command R3, before the set time of the timer 28 than the axis positioning completion data S obtained from the axis feed control means 26. A punch command PF is output to the punch drive mechanism 14. The punch command PF is given as a drive command for the clutch valve 21. Plate thickness
The time correspondence table 30 is composed of storage means in which timer times t1 to tn corresponding to various plate thicknesses d1 to dn are set. The selecting means 29 is means for selecting the timer times t1 to tn of the table 30 according to the plate thickness data D of the machining program 24 and setting them in the timer 28.

The output timing of the punch command PF having the above structure will be described. When the machining program 24 is executed, the selecting means 29 first selects the timer times t1 to tn corresponding to the plate thickness from the plate thickness / time correspondence table 30 according to the plate thickness data D, and sets the time in the timer 28. To be done. The punch command PF is output at the timing shown in FIG. FIG. 2B shows a speed curve of axis feed (for example, Y axis feed) by the command pulse output from the axis feed control means 26. When the axis positioning is started at the time T0 and the axis positioning is completed at the time T1, the punching command P is set before the completion time T1 by the set time t of the timer 28.
F is output. By this punch command PF, the crankshaft 15 (FIG. 1) stopped near the top dead center TDC in FIG. 5 starts rotating in the direction of arrow a.

In this case, at a certain plate thickness d2, as shown in FIG.
If the punch tool 18 actually contacts the workpiece W at a crank angle θ2 of, the punch tool 18 has already descended from the upper surface of the workpiece W to a predetermined proximity height (crank angle α2) at the time of completion of the axial positioning. After completing the axis positioning,
The punch tool 18 immediately contacts the work W.
When the plate thickness d3 is smaller than the plate thickness d2,
When the punch tool 18 actually contacts the work W at the crank angle θ3, the timer time is set so that the crank angle rotates to, for example, α3 when the axis positioning is completed. In this way, even if the plate thickness varies, the punching operation can be started at the timing when the punch tool 18 has already descended from the upper surface of the work W to the predetermined proximity height when the axis positioning is completed. Therefore, high accuracy and high hit rate can be realized regardless of the plate thickness.

When simultaneously feeding the X-axis and the Y-axis, if the axes are not positioned at the same time,
The punch command means 27 outputs the punch command PF before the setting time of the timer 28 after the completion of the positioning of the slower axis.
Although the servo system is a digital servo in the above embodiment, the present invention can be applied to an analog servo.

[0017]

As described above, the present invention provides a punch command output timing control device equipped with punch command means for outputting a punch command to the punch drive mechanism before the completion of axial positioning of the work feed, by the time set by the timer. Since the table is provided with the corresponding timer time and the selecting means for selecting the timer time of the table according to the plate thickness data and setting the timer, even if the plate thickness is variously changed, high accuracy,
A high hit rate can be realized.

[Brief description of drawings]

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

FIG. 2 is a plan view of a punch press machine to which the punch command output timing control device of the present invention is applied.

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

FIG. 4 is an explanatory diagram showing a relationship between timings of an axis feed command and a punch command.

FIG. 5 is an explanatory diagram of a crank angle at the time of completion of shaft positioning and contact of a punch tool.

[Explanation of symbols]

2 ... Turret, 11 ... X-axis servo motor, 12 ... Y-axis servo motor, 13 ... Work feed mechanism, 14 ... Punch drive mechanism, 15 ... Crank shaft, 18 ... Punch tool, 19 ... Clutch brake, 24 ... Machining program, 27 ... Punch command means, 28 ... Timer, 29 ... Selection means, 30 ... Plate thickness / time correspondence table, PF ... Punch command, W ... Work

Claims (1)

[Claims] 1. A shaft feed control means capable of recognizing the completion of shaft positioning of a work feed mechanism of a punch press before completion.
Punch command means for outputting a punch command to the punch drive mechanism before the completion of the axis positioning by the timer setting time,
A punch command output timing control device comprising: a table in which timer times corresponding to various plate thicknesses are set; and a selecting means for selecting a timer time in the table according to plate thickness data and setting the timer.