JPS5939430A - Control method of roll feeder - Google Patents

Abstract

PURPOSE:To facilitate the change of the angles for starting and ending releasing of feed rolls mounted to a press by reading out said angles from a storage means and matching the timings for detaching the rolls from a blank material to respective dies. CONSTITUTION:The angle theta4 and angle theta5 for starting and ending releasing of feed rolls 2, 3 for a blank material 4 which are driven in synchronization with a press machine 1 are stored respectively in a storage device with respect to plural dies. The angle theta4 and angle theta5 corresponding to the dies 5, 8 mounted to the press machine 1 are read out of the storage means. The timings for starting and ending the releasing of the rolls 2, 3 are calculated in accordance with the angle theta4, the angle theta5 and the number of press strokes. The rolls 2, 3 are detached from the material 4 during the time from the timing for starting the releasing to the timing for ending the same. The angles for starting and ending the releasing are easily changed by the above-mentioned method.

Description

[Detailed description of the invention] The present invention relates to a method for controlling a roll feeder.

Generally, a long material such as a single coil material or a bar material is fed to a press machine by a roll feeder synchronized with the operation of the press machine.

As shown in FIG. 1, the roll feeder includes a pair of material feeding rollers 2, 3 and 2', 3' on the left and right sides, which are arranged on the upper surface of the bolster of the press machine 1. The rollers 2, 3 and 2', 3' are arranged so that the crankshaft rotation angle (hereinafter simply referred to as crank angle) of the press machine 1 is the second
The opening drive is performed to change from θ1 to 02 as shown in the figure, and the plate-shaped material is thereby transported a predetermined length in the direction of the arrow 4 and processed by the press machine 1.

In the curling roll feeder, the rollers 2 and 3 and the rollers 2/ and 3/ are driven in synchronization, but if a gap occurs between the rollers 2 and 3 and the material 4, the rollers 2 and 3 are driven synchronously.
The feed amount and feed speed of the rollers 2' and 3' change, and as a result, the material 4 is distorted.

As shown in FIG. 3, the slide 1 of the press machine 1
If the upper die 5 attached to the upper die 5 is provided with a post 6 for positioning the material 4 with high precision, if the above situation occurs, the hole 7 provided in the material 4 for positioning and the post 6 There is a risk that the upper mold 5 and the lower mold 8, which is attached to the bolster 1b of the press machine 1 and forms a pair with the upper mold 5, may be damaged.

Therefore, during the pressurizing process of the press machine 1, that is, while the crank angle changes from 04 to θS as shown in FIG.
The rollers 2 and 2' are raised from the material 4 as shown in FIG. 3 (releasing) to remove the distortion caused in the material 4 and prevent the above-mentioned damage to the mold.

By the way, when the upper mold 5 and lower mold 8 are replaced in order to process products with different shapes in the press machine 1, the processing timing of the press machine 1 changes, so that the angle θ4, that is, the rollers 2 and 2' start leasing. angle and angle θS
In other words, the release end angle changes.

Therefore, each time the mold is replaced, it is necessary to adapt to the mold and set the leasing start angle θ4 and end angle θS, but in the conventional press machine 1, these angles θ4 and θ5 are controlled by a rotary cam switch that is linked to the crankshaft. Therefore, it was necessary to replace the rotary cam switch or adjust the cam position etc. every time the mold was replaced.In addition, the rotary cam switch was detected near the crankshaft, that is, in the press machine. 1, the above-mentioned replacement and adjustment work is dangerous.

In order to achieve such an object, the present invention stores the releasing start angle and ending angle of the feed roller for a plurality of molds in a storage means, respectively, and the IJJ corresponding to the molds attached to the press machine. The IJ-singing start angle and end angle are read out from the storage means, and the timing for separating the feed roller from the material is adapted to each mold.

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

FIG. 4 shows an embodiment of a roll feeder control device to which the method according to the present invention is applied. In the figure, a stroke number setting device 1o is used to set the number of operations of the press machine 10 in one minute, and the set value S, is converted into a digital signal by an analog-to-digital converter 11, and then input to an input circuit 12 and CPU via pass line 13
(Central Processing Unit) Added to 14.

The rotary cam switch 15 outputs a signal S& corresponding to each angle when the crank angle is at the angle θ1+O degrees (top dead center), θ2, and θ3 shown in FIG. The signal S, is thus applied to the CPU 14 via the input circuit 16 and the pass line 13.

As shown in FIG. 5, the rotary switch 17 has a common terminal 17a which is grounded, and an output terminal 17c to which a power supply Vee is applied via a pull-up resistor.

17d, 17e, 17f, 17g and 17h to CPU 14. Note that the signal sd output from the output terminals 17c to 17h of the rotary switch 17 indicates the model numbers of the upper mold 5 and the lower mold 8.

The ROM (read-only memory) 19 stores in advance the speed command data of the roller 2.3 corresponding to the number of strokes of the press machine 1, and the IJ IJ-singing start angle θ4 and end angle θ5 corresponding to each type. has been done.

Now, the setting value S of the stroke number setting device 1o.

is X (6IlITl), and the press machine 1 was able to pick it up.''The second die 5 and the lower die 6 correspond to the model No. 1, and the rotary switch 17 selects the point 17c, that is, the die 1. shall be.

In such a case, the CPU 11j sets the speed command data (see FIG. 7) for the rollers 2 and 3 corresponding to the set value S of the stroke setting device 10 from the time when the output signal s1 of the rotary cam switch 15 crosses the angle θl. The data is read from the ROM 19 at predetermined time intervals τ, and the data is output to the pulse distributor 24 via the nose line 13 and the output circuit 23.

・! The pulse divider 24 forms a speed command pulse signal P having a reference frequency and a speed command pulse signal CK, which is frequency-divided by the inverse ratio of the speed command value Sv, and a pulse signal P having a reference frequency.
v is applied to the synchronization circuit 25.

The motor 26 that drives the roller 2.3 has a frequency proportional to the rotational speed of the motor 26 detected.
A pulse generator 27 is provided which generates a pulse signal P, which is applied to the synchronization circuit 25 as a speed feedback signal.

After synchronizing the applied /4' pulse signals P and P with the reference clock signal CK, the synchronization circuit 25 synchronizes the /4' pulse signals Pv and P with the addition count of the deviation counter 28. The O value output from the deviation counter 28 corresponds to the speed deviation of the motor 26, and is converted to an analog signal by the digital-to-analog converter 29, and then sent to the nonlinear amplifier 30 and the servo amplifier. 313 to the motor 26.

In this way, the row 22.3 is driven and the material 4
is moved in the direction of the arrow by the required amount.

Further, in response to the output signal Sd of the LI rotary cam switch 17 on the CPU 141j-1, the ROM 19
Read the leasing start angle θ4 and leasing end angle θ6 corresponding to type 1 from , and calculate the time Ts (see) required for the crankshaft to rotate from top dead center to the leasing start angle and IJ - times 1 until the leasing end angle. The time T required for this is calculated based on the following equation.

t (sea) 60 θ4 T = -° 36o (seC) x 60 θ6 Tt = x' a so
(B e (!) However, as shown in FIG. 6, when the rotary cam switch 15 outputs the output signal S indicating the top dead center, the timer 2
2, outputs a roller lift signal to the solenoid valve drive circuit 21 via the pass line 13 and the output circuit 20 from the time when the time value of the M-crossing timer 22 reaches T until it is applied to Tt; A cylinder (not shown) is actuated which raises the rollers 2 and 2'. This changes the crank angle from 04 to θ5.
During this change, the rollers 2 and 2' rise above the material 4.

The display section 32 is for displaying the feeding length of the material 4, etc., and is operated by the CPU 14 at the timing when the crank angle reaches 03.

As explained above, according to the present invention, the roll feeder glue leasing start angle and end angle can be easily changed without making any changes to the existing press machine body.

[Brief explanation of drawings]

FIG. 1 is a front view showing the positional relationship with the press machine (Y roll feeder), FIG. 2 is a conceptual diagram for explaining the relationship between the crankshaft rotation angle of the press machine and the operation of the roll feeder, and FIG. 4 is a block diagram showing an embodiment of a control device for a roll feeder to which the method according to the present invention is applied; FIG.
The figure is a circuit diagram showing an example of a rotary switch, FIG. 6 is a graph showing the relationship between crank angle and leasing timing, and FIG. 7 is a graph showing an example of a roller driving mode. ■...Press machine, 2, 3...Roller, 4...Material, 5...Upper die, 8...Lower die, 10...Stroke number setting device, 14...CPU ( central processing unit), 1
5...Rotary cam switch, 17...Rotary switch, 19...ROM (read only memory)%21...Solenoid valve drive circuit, 22...Timer. Figure 1 Figure 3

Claims (1)

[Claims] In a control method for a roll feeder in which a material feed roller is driven in synchronization with a press machine, the feed roller glue leasing start angle and the release cinder end angle are stored in a storage means for each of a plurality of molds, and the press The releasing start angle and releasing end angle corresponding to the mold attached to the machine are read from the storage means, and the release start timing of the feed roller is determined based on the read out, leasing start angle, end angle, and number of press strokes. A control method for a roll feeder, characterized in that the feed roller is separated from the material from the start time to the end time of leasing by calculating the release end time and the release end time.