JPS59193799A - Operating method of ram in hydraulic press - Google Patents

Abstract

PURPOSE:To work safely and accurately a material to be worked by approaching a punch and a die to a safe distance between the same by a both-hand operation in the stage of starting an operation then stopping automatically the movement and approaching the punch and the die further after detecting the disposition of the material between the punch and the die. CONSTITUTION:The operator operates a both-hand push button device 5 to approach a die 19 to a punch 29 to a safe distance and immediately when the ram of a hydraulic press arrives at the safe region, a command for stopping the ram ascent is emitted to stop the ram. When the ram is moved upward, a material 65 to be worked is butted to all of the plural detectors 69 of a back gage device 21 to turn on an automatic contact signal. A numerical control device 3 reads the distance between the material 65 atop which the punch 29 is pressed and the die 19 as much as to make the material 65 immobile, then the device moves upward the ram. Whether the lower limit setting of the ram is performed or not is judged and the ram is stopped at the lowermost limit, by which the working of the material 65 is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ram operating method in a hydraulic press, and more particularly, at the start of work, a two-handed actuator is used to operate a ram between a punch and a die, which is preset and input. The machine automatically stops once after bringing the machine close to a safe distance where fingertips cannot get into it, and then detects that the workpiece is placed between the punch and die and moves the punch and die closer together to start processing. The present invention relates to a method of operating a ram in a hydraulic press.

Further, following the ram operating method described above, this relates to a ram operating method in a hydraulic press that automatically moves away to a previously set safe distance position and stops after a variable set time from the time the workpiece material has been processed. It is.

First, the background behind the implementation of the present invention is shown in Figures 1 to 5.
This will be explained using the diagram.

FIG. 1 shows a hydraulic press brake 1 as an example of a hydraulic press, and a control device 3 with a built-in computer, a two-handed push button device 5, and a switch 7 are attached to the left end of the figure.

The hydraulic press brake 1 is equipped with a front cover 9 on the front of the machine base, and between the machine base and the front cover 9 are provided a plurality of fluid pressure cylinders as shown in FIG. The left and right fluid pressure cylinders are sub-cylinders 13 and 15 for boosting power.

Main cylinder 11 and sub cylinder 13.15 mentioned above
A lower apron 17 is provided which is driven by the lower apron 17, a die 19 is fixed to the upper surface of the lower apron 17, and a back gauge device 21 is provided at the rear.

An upper apron 27 is fixed to side plates 23 and 25 that stand above the machine base on the left and right sides, and a bunch 29 is attached to the bottom surface of the upper apron 27.
is fixed.

As is clear from FIG. 2, guide screws 31, 31 are provided horizontally on the upper rear side of the lower apron 17 (on the right side in FIG. 2) near both longitudinal ends of the lower apron 17.
This guide screw 31. Back gauge device 2 equipped with a pole nut 33 that is movable in the front and back direction astride the '31
One beam member 35 is provided.

The beam member 35 described above is a motor 3 equipped with an encoder 37.
It is positioned by moving back and forth according to guide screws 31° 31 driven by 9.

The beam member 35 described above is provided with a vertical spiral shaft 41, and although the vertical spiral shaft 41 is shown in FIG. 2 as being rotated by a handle 43, it is rotated by an electric motor equipped with an encoder. The brackets 1 to 47 of the backstretch 45, which are screwed together with the vertical screw shaft 41, move up and down to change the height position.

Further, a main cylinder 11 is provided below the lower apron 17 shown in FIG. 2, and in the illustrated example, a check valve 51 with a poppet is provided at a portion of the piston 49.

When this poppet 53 is screwed onto a threaded rod 55 vertically attached to the machine base and comes into contact with a dog 57 whose position can be adjusted vertically, the check action is released and the rapid rise of the lower apron 17 is prevented by a plurality of sub cylinders. It has the effect of switching to an increase in power including 13.15.

FIG. 3 shows a plurality of sub-cylinders 1 from the rapid rise of the lower apron 17 by the main cylinder 11 shown in FIG.
A hydraulic piping diagram for switching to power increase including 3.15 is shown.

FIG. 4 shows an example in which the upper and lower limits of movement of the lower apron 17 are manually set on the lower apron 17. For example, the dog 59 corresponding to the limit switch LS3 shown at the left end of the figure moves the lower apron 17. Lower it the most,
This dog is used when providing a gap between the bunch 29 and the die 19 for loading and unloading a semi-finished product having a rising portion.

The dog 61 corresponding to the limit switch LS2 is the die 1
When a workpiece is inserted onto the workpiece 9, the distance between the upper surface of the workpiece and the lower end surface of the bunch 29 is a safe distance, such as 8 mm or less, to prevent fingers holding the workpiece from entering. This is a dog for setting a safe position.

The dog 63 corresponding to the limit switch LSI is a dog for setting the position at which the lower apron 17 occupies the height position of the die 19 when the workpiece is finally bent.

FIG. 5 is a diagram illustrating the pull-pack operation of the back stretch 45 of the back gauge device @21, which will be described later.

In other words, if the workpiece 65 rises downward during the previous bending process, the rising part of the workpiece 65 may interfere with the backstretch 45 during the bending process, as shown by the broken line in the figure. become.

Therefore, after positioning the workpiece 65 against the backstretch 45, move the backstretch 45 toward the arrow 67.
Move towards and evacuate.

This back-and-forth movement is called a pull pack.

In addition, the protrusion of the backstretch 45 that protrudes to the left in FIG. 2 and retracts from the left side of the backstretch 45 in FIG.
There are multiple stages of detectors 69 in the longitudinal direction of the backstretch 45 that detect the collision.

When bending a workpiece 65 such as a plate using the press brake 1 which is a hydraulic press equipped with the control device 3 having a built-in computer as described above, the two-handed push button device 5 and the foot switch 7. Conventionally, from the standpoint of work safety, the travel distance and temporary stop position of all movable swaging parts are entered into a computer in advance, and the two-handed push button device 5 is used to bring the swage close to a safe distance and stop it once, before starting the next operation. Hold the front end of the workpiece 65 by hand and insert it between the punch 29 and die 19, position it against the back gauge device 21, and then operate the foot switch 7 to move the punch 29 and die 19 closer together. The workpiece 65 was bent by bending the workpiece 65.

Also, if you loosen the foot switch 7, the punch 2
The die 9 and the die 19 were moved away from each other and returned to the position at a safe distance from which they had previously stopped, and the folding operation was performed.

Although safe work can be ensured using the above-mentioned method of operating a ram equipped with a conventional movable full type, there is no guarantee that the workpiece 65 is abutted against the entire length of the backstretch 45 in the longitudinal direction. Second, while bending different sides one after another, such as in box bending, workers are in an unstable position with one leg in the air for long periods of time, which causes fatigue in the fingers and toes. The disadvantage was that it was intense.

The present invention has been made to alleviate the above-mentioned disadvantages, and a preferred embodiment will be described in detail below with reference to FIG.

FIG. 6 is a flowchart showing the ram operation method according to the embodiment of the present invention, in which the NC control unit operation switch settings are first performed.

Next, select a mode for driving the hydraulic press.

That is, as shown in the lower part, it is selected whether the final bending process is to be performed in the foot switch mode or in the automatic contact mode by the operation of the detector 69 provided on the backstretch 45.

Furthermore, the foot switch mode can be either a single action mode in which the ram returns to the lowest limit after one bend, a linked mode in which the ram stops at the lower limit of the safe range, or an inching mode in which the ram returns to the lowest limit. Select whether to use a method in which the lower apron 17 rises only while the button is pressed, and stops at that position when released.

After selecting the above four modes, the operation of operating the two-handed push button device 5 to bring the tie 19 close to the punches 2 and 9 to the above-mentioned safe distance is the same for all modes, so the automatic contact mode will be explained below. The explanation of the mode will be omitted.

The numerical control device reads various data related to the back gauge device that have been input in advance from the memory.

Next, the lower limit height of the safe stroke range of the ram is input in advance, and if necessary, it is calculated and read from the memory of various data.

Once these readings are completed, the command is given to lower the ram to its lowest position, and the ram is positioned at its lowest position.

Next, the worker operates the two-handed push button device 5.

If there is a command to raise the ram from the control device 3, the ram will rise,
Without a directive, the status quo will remain.

When the ram (strictly speaking, the top surface of the die) reaches the above-mentioned safe area, a ram safe area command is issued, and immediately a command to stop the ram rise is issued and the ram is stopped.

If the ram has not reached the safe area, the operation time for the two-handed push button is insufficient, so the system returns to the standby state just before the two-handed push button ○N is pressed.

At this point, proceed to the middle between the first and second lines in Figure 6, and if the automatic contact mode switch is selected, proceed to the second line; if not, select 7-1 ~ switch mode and the operator's The note switch switches to footswitch mode ram operation, and the ram rises. If the driving wheel worker does not operate the note switch, the operating samurai's status will be maintained.

When the ram rises in the foot switch mode, all of the multiple detectors 69 of the back gauge device 21 detect the workpiece 65.
The automatic contact signal is turned ON and the command to start raising the ram is issued.

Next, the numerical control device 3 reads the distance between the upper surface of the workpiece 65 and the die 19 in contact with the bunch 29, which is sufficient to immobilize the workpiece 65, and raises the ram.

Check here whether pullback settings are enabled.

This is because, as explained with reference to FIG. 5, when the workpiece 65 hits the backstretch 45 of the backgauge device 21, the pullback operation may not be necessary depending on whether there is a downward rising part or not. be.

If the pullback is set, the pullback distance is calculated from previously input data, and the back gauge device 21 moves backward in the direction shown by arrow 67 in FIG. It also commands the completion of retreat and evacuation. If there is no pullback setting, the ram will skip the pullback related chart section and move on to the upper limit of bending processing.

That is, the computer of the control device 3 calculates or reads how far the ram will still rise before the bending process, and raises the ram.

Then, the ram stops rising at the position where the rising distance is met.

The timer turns on when the ram reaches its upper limit, and when the timer reaches its set time and turns off, the ram starts lowering.
You will have to wait until it is turned off.

Next, it is determined whether the lower limit of the ram is set.

Here, the lower limit setting of the ram and the name (Putano means that there is a designation to lower the ram to the lower limit of the safe distance and stop for multi-stage bending or continuous strokes, and it is the first step in the flowchart. The ram stops at the same position as the ram stop at the bottom of the row.

If the ram lower limit is set, the control device inputs various data and commands the ram to stop descending, and the ram stops descending.

If the lower limit of the ram is not set, there will be no subsequent bending process, so the ram will read the distance to the lowest limit position, which is the starting position, and issue a command to stop the ram, and the ram will reach the lower limit of forging. It will stop.

According to the embodiment of the present invention described in detail above, in order to bring the workpiece into contact with a plurality of detectors installed in the longitudinal direction of the backgauge device and start raising the ram for bending, This not only allowed the bending process to be performed with high precision, but also allowed workers to stand on both feet and concentrate only on their hands, resulting in less fatigue.

Furthermore, since it is equipped with a ram operation method that holds the workpiece in an immovable state between the punch and die before the pullback operation, it prevents the workpiece from shifting during the pullback operation and improves machining accuracy. Ta.

Additionally, by stopping the punch and die for continuous processing at a safe distance and starting the next bend from this position, idle time could be reduced.

In addition, in the above detailed explanation, we have explained a press brake that approaches and moves away from the upper apron, which has a lower apron punch with a die on the upper surface and a lower apron punch on the lower surface, but it is also applicable to a press brake with a movable upper apron. It is obvious that this method can be used, and it is a method that can also be implemented in a hydraulic press such as a jarring machine.

[Brief explanation of drawings]

Fig. 1 is a front view of a press brake as an example of the present invention, and attached equipment Fig. 2 is an explanatory diagram of the operation of the lower apron and back gauge device Fig. 3 is an explanatory diagram of the operation of the main cylinder and sub cylinder Fig. 4 FIG. 5 is an explanatory diagram showing an example of a method for setting the raised position of the lower apron. FIG. 5 is an explanatory diagram of a pull-back operation. FIG. 6 is a flowchart of a ram operating method. (Explanation of symbols representing main parts of drawings)

Claims (2)

[Claims] (1) When operating a ram in a press machine, a two-handed actuator moves the ram until the distance between the punch and die reaches a safe distance, and automatically stops approaching movement when the safe distance is reached. A method for operating a ram in a hydraulic press, characterized in that when detection means provided on a plane perpendicular to the ram's movement plane so as to be able to move toward and away from each other detects the placement of a workpiece, the punch and ram move closer to each other to perform processing. . (2) Further, the punch moves close to the die and processes the workpiece, and after a variable set time, the punch automatically moves away to a previously set safe distance position and stops. A method for operating a ram in a hydraulic press according to scope 1.