JP2003033831A - Method for controlling transfer of band-shaped warkpiece in pressing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for controlling the transfer of a band-shaped workpiece in a pressing machine, wherein the efficiency of press forming can be enhanced by simply and easily inching the band-shaped workpiece at a given pitch during inching of the band-shaped workpiece for the initial period of press forming. SOLUTION: Press forming is performed by transferring the band-shaped workpiece constantly at a given pitch appropriate for the width of a press die. The workpiece is controlled for inching for the initial period of press forming and, when the inching rate has reached the given pitch, inching is prohibitively controlled so that the workpiece is inched at the given pitch.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt-shaped workpiece feeding control method in a press machine for supplying a belt-shaped workpiece to a press machine.

[0002]

[PROBLEMS TO BE SOLVED BY THE INVENTION]
A strip-shaped workpiece supply device that sequentially supplies strip-shaped workpieces at a predetermined pitch between the upper die and the lower die has an automatic feed mode and an inching feed mode. The automatic feed mode is
In conjunction with the press forming operation, it is a mode in which a band-shaped work is fed in a fixed amount at a predetermined pitch preset according to the product to be press-formed to control the supply between the upper mold and the lower mold. For example, at the initial stage of press molding, the mode is a mode in which, in order to pass the leading end of the strip-shaped work between the dies, the distance is adjusted according to the ON operation time of the inching feed switch.

That is, at the initial stage of press molding, since the tip end side of the strip-shaped work which is wound and led out in a coil shape is curved due to stress, the strip-shaped work thus curved is subjected to metal feeding in the automatic feed mode. When it is supplied between the molds, the tip portion comes into contact with the molds and it becomes difficult to supply the molds in a predetermined state.

Further, since the strip-shaped work is led out in a coiled state, at the initial stage of press-molding a product from the strip-shaped work located on the outermost peripheral side of the coil,
The operator needs to perform trial molding to confirm the press-molded state of the product. At that time, the worker checks the product and the press-molded state while feeding the strip-shaped workpiece in small increments.

In the early stage of such press forming, an operator switches the belt-shaped work supply device to the inching feed mode and guides the tip of the belt-shaped work so that it is positioned between the dies while inching feeding. Need to be supplied.

However, in the above-mentioned inching feed mode, the feeding is performed by the distance corresponding to the ON operation time of the inching feed switch regardless of the predetermined feeding pitch at the time of press forming. In order to feed the strip-shaped workpieces between the dies at a predetermined pitch, it is necessary to feed the strip-shaped workpieces forward and backward by inching while visually confirming the feed amount of the strip-shaped workpieces to the dies. It took a long time and the press molding efficiency was poor.

In particular, in the case of press molding using a multi-step progressive die, the band-shaped work is press-formed into a desired shape by the first step die, and then the band-shaped work is fed at a predetermined pitch. The product of the first step is further press-molded in a state of being positioned in the process die, and thereafter, the product is subjected to pitch feeding in order, and the final die is sequentially positioned to perform press-forming. At the beginning of press molding in this case,
It is necessary to feed the strip-shaped workpiece by inching so that it can be pitch-fed with high positional accuracy while avoiding the interference of the tip of each die, but with the inching feeding method described above, accurate pitch feeding itself is not possible. It was extremely difficult, and the band-shaped work could not be accurately positioned with respect to each mold, which was apt to cause defective molding.

Further, in the strip-shaped work sent to each die, even if the pitch feed accuracy is somewhat poor, the pilot pin in the die is inserted into the hole formed in the strip-shaped work to correct the positional deviation. However, when inserting a pilot pin into a hole for a thin, fragile band-shaped work, the band-shaped work itself will be damaged by the pilot pin, making it unusable. The fix could not be made.

The present invention was invented in order to solve the above-mentioned conventional drawbacks, and the problem to be solved by the present invention is that when the band-shaped work is fed in the initial stage of press molding,
It is an object of the present invention to provide a belt-shaped workpiece feeding control method in a press machine, which can easily feed the belt-shaped workpiece at a predetermined pitch and improve the press forming efficiency.

[0010]

SUMMARY OF THE INVENTION According to the present invention, when a band-shaped work is quantitatively fed to a mold of a press machine at a predetermined pitch according to the width of the press mold, and press-molded, the band-shaped work is initially formed in the press molding. The inching feed control is performed, and when the inching feed amount reaches the above-described predetermined pitch, the inching feed is prohibited and the inching feed is performed at the above-mentioned predetermined pitch.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. First, an outline of the press machine 1 will be described. In FIGS. 1 and 2, a ram 7 having an upper die 5 attached to a lower surface thereof is supported by a main body frame 3 of the press machine 1 so as to be vertically movable, and the ram 7 is connected. It is vertically moved by a predetermined vertical stroke by a driving member (not shown). The drive member includes a crank mechanism that converts the rotational movement of the electric motor into a reciprocating linear movement, a hydraulic or pneumatic fluid pressure cylinder, and the like. A play completion detector 36 (shown in FIG. 3) such as a micro switch or a cam switch for detecting the completion of press molding based on the elevation of the ram 7 is attached to the main body frame 3.

A bed 9 is provided on the body frame 3 so as to face the lower surface of the ram 7, and a lower mold 11 is provided on the upper surface of the bed 9.
The lower die 11 cooperates with the upper die 5 to press-form a product (not shown) from a belt-shaped work W described later.

The press machine 1 may use a multi-step progressive die. That is, after the desired shape is press-formed on the strip-shaped work W carried into the first process die, the press-formed strip-shaped work W is sent at a predetermined pitch to position the product portion in the second-process die. A desired shape is press-molded on the product part by a second step mold, and thereafter, this operation is repeated until the final mold is press-molded. In the press 1 using this multi-step progressive die, it is necessary to pitch-feed the strip-shaped work to the die in each step with high positional accuracy.

A strip-shaped work supply device 13 is attached to the carry-in side of the main body frame 3 so that its supply surface and the upper surface of the lower mold 11 are substantially aligned with each other. Belt-shaped work supply device 13
Is a drive roll 19 connected to an electric motor 17 such as a numerically controllable AC or DC servo motor, a pressing roll 21 that is pressed against the outer peripheral surface of the drive roll 19 in the axial direction, and is wound in a coil shape. Derived strip work W
And a guide roll 23 for guiding between the drive roll 19 and the pressing roll 21.

The pressing roll 21 is rotatably supported, and an operating member 2 such as a hydraulic cylinder or an electromagnetic solenoid is provided.
5 is rotatably supported by a lever 26 which is connected to the roller 5, and is actuated by an actuating member 25 so that the actuating member 25 can be brought into and out of contact with the drive roll 19. Positioning between the molds is possible by releasing the clamp and allowing the displacement.

A rotation amount detector 17a such as a rotary encoder or a tachogenerator is attached to the electric motor 17, and based on a signal from the rotation amount detector 17a, the rotation amount of the driving roll 19, that is, the feeding of the strip-shaped work W. The drive roll 19 is drive-controlled while detecting the amount.

Further, in addition to the above-mentioned roll type, the band-shaped work supply device 13 is provided with a holding member for holding the band-shaped work W on a movable body which reciprocates with respect to a mold, and the movable body is automatically fed at a predetermined pitch. Alternatively, it may be a so-called grip type feeding device that feeds between molds by inching.
As a mechanism for reciprocating the movable body in the grip type strip-shaped workpiece supply device, a feed screw mechanism composed of a feed screw and a nut connected to an electric motor, a linear servo motor, and a pair of rotating bodies one of which is connected to the electric motor. It may be a belt mechanism or a crank mechanism in which a part of the stretched belt is fixed to a movable body.

A setting device 27 is attached to the upper surface of the strip-shaped work supply device 13, and the setting device 27 has a mode changeover switch 27a for switching the feed mode by the strip-shaped work supply device 13 between the automatic feed mode and the inching feed mode. An automatic feed switch 27b for executing the feed mode, an inching feed switch 27c for performing inching feed, a display device 27d for displaying the number of times of press molding, and various setting keys 27e are provided.

In FIG. 3, the CPU 31 has a ROM and an H
A program memory 33 such as a DD and a work memory 35 such as a RAM are connected to each other, and the program memory 33 stores program data for executing an automatic feed mode and an inching feed mode described later. The work memory 35 is a work area 35a for storing feed pitch data for automatically feeding the strip-shaped work W, the feed amount during the inching feed at the initial stage of the press, the number of times of press forming at which the inching feed is executed, and the strip-shaped work W. It has a first counter area 35b for measuring the inching distance and a second counter area 35c for measuring the number of times of press molding.

The CPU 31 has an I / O 37 as a setting device 27.
When the mode changeover switch 27a is operated, the mode changeover signal for changing the feed mode of the belt-like work supply device 13 to the automatic feed mode or the inching feed mode, and when the automatic feed switch 27b is operated. An automatic feed instruction signal for automatically feeding the band-shaped work W and an inching instruction signal for inching the band-shaped work W when the inching feed switch 27c is operated are input to the CPU 31.

Further, the CPU 31 outputs to the display device 27d the press number display instruction data which is incremented each time the press forming is completed and displays the press forming number. Further, the CPU 31 has a press completion detector 36 which is an I / O 37.
The press completion detector 36 detects that the press molding by the press machine 1 is completed.

A motor drive control circuit 39 is connected to the CPU 31, and the rotation amount detector 1 provided in the electric motor 17 is connected.
The electric motor 17 is numerically controlled based on the rotation amount detection signal from 7a.

In FIG. 4, in step 51, it is determined whether or not the mode changeover switch 27a is in the inching feed mode for the band-shaped workpiece W. At the initial stage of press forming, the stress due to the coil-shaped work W remaining on the work W is curved and the tip side is curved. Therefore, when supplying the work W between the dies, Since it is difficult for the tip end portion to come into contact with each other in the mold and to position the strip-shaped work W between the molds in a predetermined state, the mode changeover switch 27a is switched to the inching feed mode at the initial stage of press molding. If so, step 51 is YES in this case.

On the contrary, when the number of times of press molding is a predetermined number of times or more, there is no possibility that the strip-shaped work W is supplied between the molds in a substantially flat state and is caught in the molds and cannot be fed. Since the operator switches the mode changeover switch 27a to the automatic feeding mode of the strip-shaped work W, step 51 becomes NO. In this case, step 52
Thus, the belt-like work supply device 13 is interlocked with the press forming, and the belt-like work W is quantitatively fed at a predetermined pitch to perform an automatic feeding operation for press forming.

If the mode changeover switch 27a is switched to the inching feed mode and the result at step 51 is YES, it is judged at step 53 whether or not the press molding is completed, and if the press molding is not completed, the step is completed. 51
Return to. On the contrary, when the press molding is completed and the step 53 is Y
If ES, the first counter area 35 is determined in step 54.
The feed pitch data of the strip-shaped work W stored in the work area 35a is stored in b.

Next, at step 55, it is judged whether or not the feed data for one pitch stored in the first counter area 35b is "0". Now, at the initial stage of press molding, since the band-shaped work W has not been inching feed, step 55 becomes NO, and then it is determined in step 56 whether or not the inching feed switch 27c has been turned ON.

Now, the inching feed switch 27 is turned on in order to feed the strip-shaped work W in an inching manner, and the step 56 returns to Y.
When ES, inching feed switch 27 is performed in step 57.
After the ON operation time of c, the feed pitch data stored in the first counter area 35b is decremented in order, and the electric motor 17 is drive-controlled based on the decrement amount to feed the strip-shaped workpiece W in small steps, Return to 55.

When the inching feed amount of the strip-shaped work W reaches a predetermined pitch, that is, when the feeding pitch data of the first counter area 35b becomes "0", the inching feed switch 27c is turned on.
The inching feed by the operation is prohibited and the process returns to step 51. In addition, in step 56 described above, the inching feed switch 2
When 7c is OFF, the process returns to step 51.

Then, the operator monitors the press molding condition,
If it is determined that it is no longer necessary to feed the strip-shaped work W by inching, the mode changeover switch 27a is switched to the automatic feed mode, and the process proceeds to step 52. In the automatic feed mode in which the strip-shaped work W is fed in a fixed amount at a predetermined pitch. Press molding.

In this embodiment, when the band-shaped work W is inchingly fed at the initial stage of press forming, the band-shaped work W is fed by a predetermined pitch so that the band-shaped work W is fed between the molds. It is possible to carry out a fixed amount of feeding for each predetermined pitch, simplifying the work for positioning the feeding amount and improving the press molding work efficiency.

[0031]

As described above, according to the present invention, when the band-shaped work is moved in the initial stage of the press-forming, the band-shaped work can be easily moved in the predetermined pitch to improve the press-forming efficiency.

[Brief description of drawings]

FIG. 1 is a schematic front view showing the outline of a press machine.

FIG. 2 is an explanatory view showing a structure of a strip-shaped work supply device.

FIG. 3 is an electrical block diagram showing an outline of control.

FIG. 4 is a part of a flowchart showing an inching feed process of a belt-shaped work.

[Explanation of symbols]

1-press machine, 5-upper mold, 11-lower mold, 13-strip work supply device, W-strip work

Claims (4)

[Claims] 1. When press-molding a strip-shaped workpiece by a fixed pitch according to the width of the press die to a die of a press machine for press-forming, the strip-shaped workpiece is controlled by inching at the initial stage of press forming. A method of feeding a strip-shaped workpiece in a press machine, which inhibits inching feed when the amount of dynamic feed reaches the above-mentioned predetermined pitch. 2. At the initial stage of press molding, at least the leading end of the strip-shaped workpiece introduced between the molds is carried out to a position where it does not interfere with the press machine as the press molding progresses. Control method for strip-shaped workpieces in a press machine. 3. The method for controlling the feeding of a strip-shaped work in a press machine according to claim 1, wherein the rotating body for sandwiching the strip-shaped work is drive-controlled to feed the strip-shaped work by a fixed amount and a small amount. 4. The method for controlling the feeding of a strip-shaped work in a press machine according to claim 1, wherein the movable body holding the strip-shaped work is reciprocally moved to feed the strip-shaped work by a fixed amount and a small amount.