JPH0790284B2 - How to operate the folding machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of operating a folding machine in which a plate material sandwiched between upper and lower dies is bent by pushing up the bending dies.

[0002]

2. Description of the Related Art Conventionally, as a folding machine, as shown in FIG. 7 (A), a plate material W is sandwiched by upper and lower molds 50, 51, and a portion of the plate material W protruding from the upper and lower molds 50, 51 is bent by a bending mold 52. Some push up and bend the edges. As shown in FIGS. 6 (A) to 6 (C), the opening angle of the end bending of the plate material by such a folding machine is usually 0 ° (crushing) or 60 ° to 120 °. It is not done below 60 °. The reason is that in the above-mentioned end bending step, the opening angle of the bent piece W1 is limited by the angle α of the upper die 50, and this angle α is designed to be 60 ° or less from the viewpoint of the strength of the upper die 50. It's difficult.

The 0 ° end bending is performed as follows. That is, as shown in FIG. 7A, the bent piece W1
After the end is bent to about 60 °, the upper die 50 is once raised as shown in FIGS. 7 (B) and 7 (C) and then lowered again to be crushed.

Therefore, it has been considered that the above-mentioned crushing method should be used even when bending at an arbitrary opening angle of 60 ° or less. That is, recently, the up-and-down drive of the upper die 50 is controlled by a hydraulic servo. Therefore, after bending the bent piece W1 to about 60 ° as shown in FIG. 7A, as shown in FIG. 8A. Then, the upper die 50 is once raised and then lowered to an arbitrary height as shown in FIG.
This is a method of processing No. 1 into a desired opening angle.

[0005]

However, in the bending method of FIG. 8, since the upper end of the bent piece W1 is pressed by the upper die 50, good bending as shown in FIG. 9 (A) cannot be performed. Figure 9
The bent piece W1 may be in a curved state as in (B).

An object of the present invention is to provide a method of operating a folding machine, which can accurately perform a bending process with a sharp angle of a desired angle.

[0007]

According to a first aspect of the present invention, there is provided a method for operating a plate material feeding device for moving a plate material forward and backward, an upper die and a lower die for vertically sandwiching the plate material advanced by this device, and the sandwiching device. It is applied to a folding machine provided with a bending die that bends a portion of the plate material that protrudes forward from the upper and lower dies along the upper die. In such a folding machine, the end of the plate material is bent by the bending die until the opening angle becomes an acute angle, the upper die is raised to slightly retract the plate material, and then the upper die is lowered again, This is a method of narrowing the opening angle of the bent piece by pressurizing the vicinity of the base end of the bent piece by bending.

The operating method according to claim 2 is applied to the folding machine according to claim 1, which is provided with an upper mold angle adjusting mechanism for changing a front-back tilt angle of the upper mold. In such a folding machine, similarly to the case of claim 1, after bending the end portion of the plate material until the opening angle becomes an acute angle, the upper die is lifted to slightly retract the plate material and the upper die is moved. This is a method of inclining to the rear and lowering the inclined upper mold to narrow the opening angle of the bent piece by the bending.

[0009]

According to the operating method of claim 1, after bending the end portion of the plate material to an acute opening angle, the upper die is temporarily raised and the vicinity of the proximal end of the bent piece is pressed when the upper die is lowered again. Since the opening angle is narrowed by, unlike the case where the upper end of the bent piece is pressed, the opening angle can be accurately narrowed without bending the bent piece.

According to the operating method of claim 2, after the end portion of the plate material is machined to an opening angle of an acute angle, the upper die is temporarily raised and tilted at a predetermined angle, and the bent piece is bent by the inclined upper die. Since it is pressed, it is possible to accurately perform bending to a desired acute angle.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. This operating method is applied to the folding machine 1 shown in FIG. The folding machine 1 is a pressurizing device including a hydraulic cylinder.
An upper die 8 attached to the ram 7 of 33 and driven to move up and down,
A lower die 10 fixed to the main body frame 9 and a bending die 11 for bending the protruding portion W1 of the plate material W sandwiched by the upper and lower dies 8, 10 upward are provided.

The bending die 11 is attached to the tip of a rocker arm 12, and the rocker arm 12 has three hydraulic cylinders 13 ...
It is connected to 15, and can move up and down, swing, and move back and forth. The upper die 8 has a die width changing mechanism 16 described later.
The mold width L (FIG. 4) can be changed by.

As shown in FIG. 3, the plate material feeding device 2 arranged in front of the folding machine 1 has a table 3 on which a plate material W is placed.
A width determining mechanism 4 for positioning the plate material W on the table 3 in the width direction, an origin finding mechanism 5 for positioning the plate material W in the front-rear direction, and a side surface shape C that holds the plate material W and moves back and forth.
And a character-shaped carriage 6. The carriage 6 is
It is installed on the bed 20 (FIG. 2) so as to be movable back and forth via rails (not shown), and is driven in the front-back direction by the feed screw 21 and its driving servomotor 22.

At the front end of the carriage 6, there is provided a plate material rotating device 23 for indexing and rotating the plate material W at a predetermined angle (for example, 90 ° or 180 °). The plate material rotating device 23 includes a pair of rotatable pads 24 and 25 for sandwiching the plate material W on the table 3 from above and below, and a hydraulic motor 26 for rotationally driving the lower pad 25. The upper pad 24 is attached to an elevating holder 28 that can be moved up and down along a vertical rail 27 provided at the front end of the carriage 6, and is driven up and down by an elevating device 29 such as a cylinder device.

In FIG. 3, the table 3 has a carriage passage 17 for allowing the carriage 6 to pass therethrough in the central portion, and is composed of a large number of strip-shaped plates 3a, and the positioning claws 4a of the width determining mechanism 4 are strip-shaped plates. It protrudes from the gap between 3a so as to be movable left and right. The origin finding mechanism 5 is composed of a plurality of origin finding pins 5a which can be projected and retracted by a cylinder device (not shown).

FIG. 4 is a schematic front view of the mold width changing mechanism 16 of FIG. The upper mold 8 is formed by stacking a large number of plate-shaped split mold members 8a, and these split mold members 8a have horizontal axes.
Each of the 30 is rotatably mounted in a downward posture and a flipping posture. The split mold member 8a in the downward posture is a posture that acts on the pressing force during bending, and the arrangement width of the split mold members 8a in the downward posture is the mold width L. The attitude of the split mold member 8a is changed by turning the turning support member 31 which is driven to turn. The rotation of the rotation support member 31 is controlled at an arbitrary angle by a hydraulic servo (not shown). The rotation support member 31 is driven back and forth along the rail 32 by a die width changing drive source such as a servo motor and a feed screw (not shown). The die width is changed by controlling the feed position.

Next, the operation of the bending machine 1 having the above-described structure for bending a desired acute angle will be described. The plate material W that has been carried onto the table 3 and positioned in each of the directions A and B (FIG. 3) has a plate material rotation device in which the central portion is the carriage 6.
It is sandwiched by 23 and fed into the folding machine 1 by the forward movement of the carriage 6.

As shown in FIG. 1 (A), the fed plate material W is sandwiched between an upper die 8 and a lower die 10, and the portions protruding from the upper and lower dies 8 and 10 are lifted by the bending die 11. Can be folded upwards. After this ascending, the bending die 11 slightly moves toward the upper and lower dies 8 and 10 and presses the bent portion of the plate material W. As a result, the bent piece W1 on one side of the plate material W is bent at a predetermined opening angle.

Then, the upper mold 8 is opened and once lifted as shown in FIG. 1 (B), and the carriage 6 is slightly retracted, so that the plate material W is slightly retracted as shown in FIG. 1 (C). That is, the rear portion of the upper die 8 that rises and stands by corresponds to the vicinity of the base end of the bent piece W1 of the plate material W. Then, the upper mold 8 is lowered to a predetermined height as shown in FIG. Thereby, the vicinity of the base end of the bent piece W1 of the plate material W is pressed, and the end portion of the plate material W is bent to a desired opening angle. Thus, since the vicinity of the proximal end of the bent piece 1W is pressed, the bent piece W is different from the case where the upper end is pressed.
1 can be accurately bent to a desired acute angle without bending.

After this, the carriage 6 is retracted, the plate material W is rotated by, for example, 90 ° by the plate material rotating device 23, and then fed back to the folding machine 1. By repeating such an operation, the four sides of the plate material W or only the necessary sides are bent.

FIG. 5 is an explanatory view showing another embodiment of the present invention. That is, another operation method of bending the end portion of the plate material W to a predetermined acute opening angle with the folding machine 1 will be described. In this operating method, as shown in FIGS. 5 (A) and 5 (B), the bending process of the end portion of the plate material W by the bending mold 11 is finished, the upper mold 8 is opened and lifted and retracted, and then the previous embodiment is performed. Similarly to, the plate material W is slightly retracted as shown in FIG. At the same time, the upper die 8 is rotated by the hydraulic servo of the die width changing mechanism 16 to set the desired inclination angle θ. This tilt angle θ
Is a bent piece W1 of the plate material W to be finally bent.
Is the opening angle of.

The upper mold 8 is shown in FIG.
As described above, the bent piece W1 of the plate W is pressed. In this way, since the upper die 8 tilted at a desired angle is pressed, the bending piece W1 is accurately bent to a desired opening angle θ without bending.

[0023]

According to the operating method of claim 1, after bending the end portion of the plate material to an acute opening angle, the upper mold is temporarily raised and the vicinity of the base end of the bending piece is added when the upper die is lowered again. Since the opening angle is narrowed by pressing, the opening angle can be accurately narrowed without bending the bending piece unlike the case where the upper end of the bending piece is pressed.

According to the operating method of claim 2, after the end portion of the plate material is machined to an opening angle of an acute angle, the upper die is temporarily raised and tilted at a predetermined angle, and the bent piece is bent by the inclined upper die. By pressing, the bending piece can be bent more accurately with an acute angle of a desired angle without bending the bent piece.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a procedure of a method of operating a folding machine according to an embodiment of the present invention.

FIG. 2 is a cutaway side view of the entire folding machine.

FIG. 3 is a plan view of a plate material feeding device in the folding machine.

FIG. 4 is an enlarged front view of a mold width changing mechanism in the folding machine.

FIG. 5 is an explanatory diagram showing a procedure of an operating method according to another embodiment of the present invention.

FIG. 6 is a side view showing each example of a plate material end-bent by a conventional folding machine operating method.

FIG. 7 is an explanatory diagram showing a procedure of performing end bending with an opening angle of 0 ° by a conventional operating method.

FIG. 8 is an explanatory diagram of a conventional operating procedure for end-bending an end portion of a plate material to a desired opening angle of 60 ° or less.

FIG. 9 is a side view showing each example of a plate material end-bent by the operation procedure.

[Explanation of symbols]

1 ... Bending machine, 2 ... Plate material feeding device, 4 ... Width determining mechanism, 6 ...
Carriage, 8 ... Upper mold, 10 ... Lower mold, 11 ... Bending mold, 16 ... Mold width changing mechanism, 33 ... Pressurizing device, W ... Plate material, W1 ... Bending piece

Claims (2)

[Claims] 1. A plate material feeding device for moving a plate material forward and backward, an upper mold and a lower mold for vertically sandwiching the plate material advanced by this device, and a portion of the sandwiched plate material projecting forward from the upper and lower molds. In a folding machine equipped with a bending die that bends upward along an upper die, the bending die bends an end of a plate material until an opening angle becomes an acute angle, and the upper die is lifted to slightly bend the plate material. After retreating, the upper die is lowered again, and the vicinity of the base end of the bending piece by the bending is pressed to narrow the opening angle of the bending piece, and the operation of the bending machine. Method. 2. A plate material feeding device for moving a plate material forward and backward, an upper mold and a lower mold for vertically sandwiching the plate material advanced by this device, and a portion of the sandwiched plate material that is projected forward from the upper and lower molds. In a bending machine including a bending die that bends upward along an upper die, and an upper die angle adjusting mechanism that changes a front-back inclination angle of the upper die, an opening angle of an end portion of the plate material by the bending die is Bending until it becomes an acute angle, raising the upper mold to slightly retract the plate material, and tilting the upper mold backward, then lowering the upper mold again, and bending of the bent piece by the bending. A folding machine operating method characterized by narrowing the opening angle.