JP2545383Y2 - Work flapping suppression device in punching press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a work flutter suppressing device that improves the punching accuracy by suppressing the work flapping due to the vibration generated by the punching operation of a punching press.

(Prior Art) As shown in FIGS. 6 and 7, a punching press 1 places a work on a fixed center table 5 and movable tables 7, 9 provided on the left and right sides of the center table 5. The work is clamped by a work clamp appropriately mounted on the carriage 11, moved in the X-axis direction and the Y-axis direction by a drive shaft (not shown), positioned, and then moved to a ram 13 provided on the frame 3.
The workpieces are punched by dies 19 and 21 mounted on the upper and lower turrets 15 and 17, respectively.

(Problems to be solved by the invention) By the way, when the ram 13 operates, vibration
And transmitted to the carriage 11 (FIG. 8). This vibration is transmitted to the tips of the movable tables 7, 9 with the carriage 11 side of the movable tables 7, 9 as a fulcrum, and generates flapping (FIG. 9). The flapping of the movable tables 7, 9 is also transmitted to the work on the tables 7, 9.

As shown in FIG. 10, in one cycle of the press operation, vibration occurs at the positioning time t1 of the carriage shaft and the punching time t2. As shown in FIGS. 11 (A) and (B), the vibration waveform and the carriage due to the operation of the ram 13 are shown.
When the vibration waveform from the 11 movement positioning is synthesized,
If there is no phase difference between the two waveforms, the flutter is amplified, and if there is a phase difference of 90 degrees between the two waveforms, the flutter is canceled. According to the experimental results, flapping or no flapping may occur due to a difference of several tens of milliseconds in the phase difference between the vibration by the ram 13 and the vibration by the carriage 11.

The following cases are considered for the occurrence of such flapping.

(1) The movable tables 7, 9 do not have sufficient rigidity. At this time, due to the flapping of the movable tables 7, 9,
Since the work is flapping, the punching positions of the dies 19 and 21 may be misaligned and affect the accuracy of the product. If the positioning speed and the positioning acceleration are reduced in order to suppress the flapping, the number of punches per minute is reduced, and the productivity is reduced.

(2) If sufficient rigidity is given to the movable tables 7, 9, the weight of the movable parts of the movable tables 7, 9 increases,
There is a problem that the cost increases because the size of the servomotor to be driven increases.

(Means for Solving the Problems) In view of the conventional problems as described above, the present invention relates to a work in a punching press for punching the work by driving a ram after positioning the work by moving a carriage. A calculating device for calculating a positioning time from a positioning distance of the workpiece and calculating a punching time from a stroke of the ram to determine whether or not a condition for generating the flutter is provided. In this case, a timing controller is provided for controlling the timing of operating the ram after positioning the work so as to be shifted.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a work flapping suppressing device according to the present embodiment. The work flapping suppressing device 23 mainly includes an arithmetic unit 25, an axis controller 27, a timing controller 29, and a ram controller 31.

The arithmetic unit 25 calculates the positioning time t1 from the positioning distance of the punching press 1 and the punching time t2 from the stroke of the ram 13, and determines whether or not the condition causes fluttering. In Case of,
A timer time T for shifting the operation timing of the ram 13 so as to be slightly delayed is calculated.

The axis controller 27 drives the servomotor m based on the movement command a of the arithmetic unit 25 to perform the movement positioning of the work, and transmits a press signal p0 when the movement positioning is completed. The timing controller 29 is the axis controller
In order to operate the ram 13 after the elapse of the timer time T input from the arithmetic unit 25 from the reception of the press signal p0 at 27, the timing with the start of punching after the completion of positioning is controlled.

RAM controller 31 is the timing controller
The ram 13 is driven by the press signal p1 from 29, and the press completion signal p2 is transmitted to the arithmetic unit 25 when the press is completed.

Next, FIG. 2 is a basic explanatory view of the press operation without flutter in FIG. The press signal p0 falls according to the positioning completion signal of the carriage moving axis CA, and the operation of the ram 13 is started by the fall of the press signal p0.
When the ram 13 returns to the top dead center and the press completion signal p2 falls due to the completion of the press, the next axis operation starts.

FIG. 3 shows a basic explanatory view of a pressing operation with fluttering. The positioning time t1 at which flapping occurs and the punching time t2 are set, and it is determined whether or not the condition under which flapping occurs is determined every cycle.When the condition under which flapping occurs, the positioning time t1 elapses. The timing of the operation of the ram 13 is set to the timer time T without immediately starting the punching.
It is only shifted. In this manner, by shifting the operation timing of the ram 13, flapping of the work and the like can be suppressed, and the punching accuracy is maintained.

Next, FIG. 4 is an explanatory diagram of a timing state of the flapping suppressing device in FIG. The positioning times t11, t12, and t13 by the carriage moving axis CA in the cycles A, B, and C are calculated, and the punching times t21, t22, and t23 are calculated by the stroke of the ram 13 by the press signal p0, and the positioning times t11 and t12 are calculated. , t13 and the punching times t21, t22, t23, it is determined whether or not the condition is that fluttering occurs. If the condition is that fluttering occurs, an appropriate timer time TA, as shown in cycles B and C, TB is set, and the operation timing of the ram 13 is appropriately shifted to suppress flapping.

Next, FIG. 5 shows a flow chart of the work flapping suppressing device in FIG. Step 1 in the figure
(S1) calculates the positioning time t1 from the positioning distance.
Step 2 (S2) calculates the punching time t2 from the ram stroke. Step 3 (S3) is the time t1, t2 of steps 1 and 2.
It is determined whether or not the condition is that fluttering occurs.
If it is determined that the fluttering condition is satisfied, a step 4 (S4) calculates a timer time suitable for the positioning time t1 and the punching time t2. If there is no flapping, one cycle of punching operation is started immediately. Step 5 (S5) is Step 4
The timer time calculated in
In step 6 (S6), a one-cycle punching operation is executed.

The above operation is repeated, and the operation timing of the ram 13 is shifted by the timer time only under the condition that the flapping occurs, so that the reduction of the hit rate is suppressed to a minimum and the punching accuracy of the product is maintained. You.

[Effects of the Invention] As can be understood from the description of the embodiment as described above, in the present invention, it is determined whether or not the condition under which flapping occurs is determined based on the positioning time and the punching time. In some cases, the configuration is such that the operation timing of the ram is shifted, so that the phase of the vibration caused by the positioning of the workpiece and the vibration caused by the operation of the ram can be shifted, fluttering is easily suppressed, and the punching accuracy of the product is maintained. .

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the work flapping suppressing device according to the present invention, FIG. 2 is a basic explanatory view of the press operation without flutter in FIG. 1, and FIG. 3 has flutter in FIG. FIG. 4 is a basic explanatory diagram of the press operation, FIG. 4 is an explanatory diagram of a timing state of the flapping suppressing device in FIG. 1, FIG. 5 is a flowchart of the work flapping suppressing device in FIG. 1, and FIG. FIG. 7 is a front view, FIG. 7 is a plan view of FIG. 6, FIG. 8 is an explanatory view of a state of generation of vibration by a ram operation, FIG. 9 is an explanatory view of a state of transmission of the vibration of FIG. FIG. 10 is an explanatory diagram of a conventional press operation, and FIG. 11 is a diagram of a vibration waveform generated in the ram and the carriage. FIG. 10A shows amplification of the synthesized waveform, and FIG. 10B shows attenuation of the synthesized waveform. 23 ... Work flapping suppression device 25 ... Computing device 27 ... Axis controller 29 ... Timing controller 31 ... Ram controller

Claims (1)

(57) [Scope of request for utility model registration] An apparatus for suppressing flapping of a work in a punching press for punching the work by driving a ram (13) after the work is positioned by moving a carriage (11). An arithmetic unit (25) for calculating the positioning time (t1) and calculating the punching time (t2) from the stroke of the ram (13) to determine whether or not the condition causes flapping; And a timing controller (29) for controlling the timing of operating the ram (13) after the positioning of the workpiece, the apparatus comprising a timing controller (29).