JPH07290151A - C type bending press - Google Patents

Abstract

PURPOSE:To reduce size by making the motion of an upper frame elevating a die to hold a work of sheet metal, etc., and the motion of a link mechanism elevating a blade to bend a work to a common one crank mechanism. CONSTITUTION:A crank shaft 3, which is provided with an opening/closing crank pin 13 to elevate C shape connecting rod 7 and a crank pin for bending to elevate a main link 15, is provided to the lower end part of a lower frame, a work held to a receiving die 25 with a pressing die 26 by lowering a low shape connecting rod 7 is further pressed by turning of the crank shaft 3 accompanied with elastic deforming of the bow shape connecting rod 7, further about in the turning range beta thereof, a blade 1 is constructed to take a locus to bend the work W. Also, the turning range beta therein of the crank pin 13 for opening/ closing and crank pin 19 for bending is constructed so as to be near on the way to the respective dead point Pa, Pb.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a C-shaped bending press machine of a type in which a work such as a sheet metal, a steel material, a wire material or the like is sandwiched between molds at an opening / closing portion of a front end of a C-shaped frame and the work is bent by a blade.

[0002]

2. Description of the Related Art There are various types of sheet metal bending presses. However, a C-shaped frame that can be opened and closed to sandwich the sheet metal allows quick and accurate holding of the sheet metal, and a blade. The type has an advantage that it is possible to skillfully prevent the generation of scratches and the occurrence of defective products such as hip breaks and distortions by ideally capturing the trajectory of the blade movement. In this sense, in the present applicant, C by blade
A mold bending press was proposed (Japanese Patent Laid-Open No. 2-274317, etc.).

According to this, in a C-shaped frame in which an upper frame is rotatably supported at a rear end of a lower frame, a link mechanism for orbitally moving a blade is provided in the lower frame. On the frame, a vertically linked swinging link is pivotally attached to the upper end of the main link arranged almost vertically. For the vertical movement of the upper frame for opening and closing the C-shaped frame, the lower frame was provided with a crank mechanism for moving up and down the bow-shaped connecting rod. There may be a crank mechanism that moves the frame up and down). Regarding the movement of the blade, a crank mechanism for moving it up and down is provided at the lower end of the main link.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
According to the die-bending press, it is provided with a crank mechanism for vertically moving the upper frame and a crank mechanism for moving the link mechanism, and it is necessary to have both crank mechanisms together, which is an obstacle to downsizing. In addition, since power and members are frequently used, this is a cause of high cost. Moreover, there was a problem with work efficiency.

Regarding the procedure of bending the sheet metal with respect to workability, when the sheet metal is inserted into the C-shaped frame, the upper frame lowers and is held down by the holding die by the pressing die, and then the subsequent blade is pressed. The orbital motion of the sheet metal causes the sheet metal to be bent, and the upper frame rises when the bending is completed.Therefore, the crank mechanism that moves the upper frame and the crank mechanism that moves the link mechanism are alternating operations that require confirmation. This has hindered improvement in work efficiency because time loss inevitably occurs during normal control. Further, it has not been easy to build control software for following such a procedure.

The present invention has been made in view of the above circumstances.
Since one crank mechanism is common to the motion of the upper frame and the motion of the link mechanism, it is possible to make it compact, structurally cheap, and the work procedure is simple, resulting in work efficiency. A good object is to provide a C-shaped bending press machine that is easy and easy to assemble software.

[0007]

In order to achieve the above object, the present invention interposes an arcuate connecting rod for vertically moving an upper frame so that the upper frame moves up and down with respect to the lower frame. A main link with a blade and a follower pivotally attached to the upper end of the main link so that it can be vertically swung so that the work sandwiched between the receiving mold of the front end opening and closing part and the pressing mold can be bent by the blade. In a C-shaped bending press equipped with a link mechanism composed of a link on a lower frame, an opening / closing crank pin for moving the bow-shaped connecting rod up and down and a bending crank pin for moving the main link up and down are both provided at the lower end of the lower frame. It is equipped with a crankshaft equipped with it, and the work held by the pressing die to the receiving die when the bow-shaped connecting rod is lowered is held mainly by the rotation of the crankshaft that causes elastic deformation of the bow-shaped connecting rod. In addition to pressing, the blade is configured to take a trajectory that bends the work in its rotation range, and the rotation range of the opening / closing crank pin and the bending crank pin at that time is close to their respective dead points. Configured to be.

[0008]

[Operation] Since the C-shaped bending press is configured as described above, the procedure for bending the work is that when the work is inserted between the open receiving die and the press die, the crankshaft rotates normally. The blade acts so as to face in the bending direction, and the pressing die lowers the work piece through the bow-shaped connecting rod, and in that state the blade pushes and bends the work piece.
Simultaneously with the bending, the blade and the pressing die are returned to their original positions by the reverse rotation of the crankshaft.

Although the crankshaft rotates due to the bending operation of the blade beyond the time when the pressing die presses the work,
Since the power to the presser die is absorbed by the arcuate rod, the rotation of the crankshaft is allowed. Further, since the crankshaft is rotated around the dead center of the opening / closing crankpin and the bending crankpin during the bending operation of the blade, even if the bow-shaped connecting rod is elastically deformed, the power is not overloaded. It does not hang.

[0010]

Embodiments of the present invention will now be described with reference to the drawings.

The drawing shows an example of a C-shaped bending press machine that uses a sheet metal as a work W and bends the workpiece W. However, in the case of processing other steel plates, wire rods, etc., a similar structure is used. It can be carried out. In the C-shaped bending press machine, a link mechanism M for orbitally moving the blade 1 is provided on a C-shaped frame F that can be opened and closed.
This is a machine exclusively for forward bending in which the work W is bent upward by the movement of 1., but the power of the opening / closing movement of the C-shaped frame F and the movement of the link mechanism M is unified. That is, it is a drive series in which both movements are realized by one crankshaft 3.
By the way, in the case of the conventional example, considering only forward bending, there are two driving systems, and since a crank mechanism for eccentrically moving the swing shaft of the driven link to add reverse bending is provided, three driving systems are provided. Has become.

The C-shaped frame F is similar to the conventional one,
A support plate 10 for supporting the support shaft 8 on the lower frame 5 by supporting the upper frame 6 at the rear end on the lower frame 5.
Is erected. A bow-shaped connecting rod 7 for opening and closing is interposed between the lower frame 5 and the upper frame 6, and a lower end of the lower frame 5 serves as a driving shaft for performing both the opening and closing of the upper frame 6 and the link mechanism M. Is provided with a crank shaft 3, and a motor (not shown) is installed at a side end. In addition, the upper end of the arcuate connecting rod 7 is pinned to the front upper end of the upper frame 6 and the lower end of the lower frame 5 is pin-connected to the crankshaft 3 so that the arcuate connecting rod 7 can be pushed up and opened and closed at the lower part of the crankshaft 3. The push-up rotation range α of the crank crank pin 13 is set, and the rotation range β that causes the arcuate connecting rod 7 to be elastically deformed is set continuously.

The link mechanism M comprises a main link 15 having the blade 1 at the upper end and a driven link 16 pivotally supported below the support shaft 8 at the rear end, of which the main link 15 is the lower end at the crankshaft 3. And the push-up motion range (α + β) of the bending crank pin 19 is set in the upper part of the crankshaft 3. In addition, the driven link 16
With respect to (1), a swing shaft 21 serving as a swing center is provided at the rear end, and a circular orbit R is formed so that the pivot pin 23 with the main link 15 at the tip can impart a predetermined orbit to the blade 1. A crank mechanism using the swing shaft 21 as a crank pin may be provided so that the circular orbit R can be changed. In this case, the blade 1 at the upper end of the main link 15 is provided.
The circular orbit R can be changed by changing (changing) the type of the mounting die 24.

In the C-shaped frame F, a receiving die 25 is provided at the upper end of the lower frame 5 at the opening / closing portion at the front end, and a holding die 26 is provided at the upper frame 6. This position where the work W is sandwiched is restricted in height due to the workability of the work W (for example, the height is set to about 670 mm), but the front-back width of the C-shaped frame F is restricted in the bending of the work W. Within the range, it is desirable to make the width as narrow as possible in terms of compactness. So, conventionally,
Although the C-shaped frame F has a large width protruding rearward from the arcuate connecting rod 7, in this embodiment, the support shaft 8 of the upper frame 6 and the swing shaft 21 of the driven link 16 are arranged inside the arcuate connecting rod 7. By doing so, the width of the C-shaped frame F was extremely narrow (for example, about 460 mm).

By setting the inside of the support shaft 8 and the swing shaft 21 in this manner, the opening / closing crank pin 13 and the bending crank pin 19 can obtain a predetermined movement range (α + β) near their dead points Pa and Pb. It was That is, the dead point Pa of the opening / closing crankpin 13 is located at the lower end of the turning track due to the positional relationship between the center O of the crankshaft 3 and the support shaft 30 at the upper end of the arcuate rod 7, but the support shaft 8 is the center thereof. Since the position is close to the line connecting the O and the bearing shaft 30, the upper frame 6 is opened as necessary by pulling the lower end of the arcuate rod 7 toward the dead point Pa in the forward direction. . Further, the dead point Pb of the bending crank pin 19 is located at the upper end of the rotation track due to the positional relationship between the center O of the crank shaft 3 and the center of the pivot pin 23, but from the position of the swing shaft 21 to the tip. Since the pivoting orbit of the pivot pin 23 has a small turn, a predetermined orbit of the blade 1 is obtained by the motion of the bending crank pin 19 near the dead point Pb.

Within the rotation range α of the crankshaft 3, the upper frame 6 is opened and closed, and at the same time, the blade 1 is moved.
Up and down movements will be made up to the bending position. Then, in the rotation range β beyond that, the bow-shaped connecting rod 7 is elastically deformed, and the blade 1 performs an operation of bending the work W. The crankshaft 3 does not stop or stop between the two rotation ranges α and β, and continuous operation without confirmation results in no time loss.
The operation that took 6 seconds is now sufficient for 1.5 seconds. The elastic deformation that allows the rotation of the rotation range β is not limited to the arcuate connecting rod 7. For example, in the upper frame 6, a rubber or a spring is provided at any position where power is transmitted to the presser die 26. It is also possible to interpose an elastic material such as the above, and even if it does so, it is not against the spirit of the present invention. Also,
It is possible to provide the upper frame 6 with the link mechanism M and the crankshaft mechanism based on the idea that the upper frame 6 and the lower frame are symmetrical.

[0017]

As described above, according to the present invention, there are the following excellent effects.

A single crank mechanism is common to the movement of the upper frame for opening and closing the presser die and the movement of the link mechanism for moving the blade up and down, which greatly simplifies the structure and reduces power consumption. It is suitable for making a C-shaped bending press compact, to an extent never thought of, and can be provided at an extremely low cost, and is also very suitable for energy saving.

After the pressing die presses the work, the crankshaft does not have to be stopped in order to make the blade desired for bending the work, and a continuous operation of one step of the crankshaft is performed during that period. Since it is simple and there is no time loss, the work efficiency is very good, and the way to assemble the software is also very easy.

[Brief description of drawings]

FIG. 1 is a side view of a C-shaped bending press machine showing movement by a chain line and a chain double-dashed line.

[Explanation of symbols]

M-link mechanism Pa, Pb Dead point W Workpiece 1 Blade 3 Crankshaft 5 Lower frame 6 Upper frame 7 Bow-shaped connecting rod 13 Opening / closing crankpin 15 Main link 16 Driven link 19 Bending crankpin 25 Receiving die 26 Pressing die β Range of rotation of crankshaft that accompanies elastic deformation of bow-shaped rod

Claims (1)

[Claims] 1. An upper frame 6 with respect to a lower frame 5.
So as to move up and down, an arcuate connecting rod 7 for moving up and down the upper frame 6 is interposed between the frames 5 and 6, and the work W sandwiched between the receiving die 25 and the pressing die 26 at the front end opening / closing portion is bladed. The lower frame 5 is equipped with a link mechanism M including a main link 15 with a blade 1 and a driven link 16 pivotally attached to the upper end of the main link 15 so as to be vertically swingable so as to be bent at 1. In the C-shaped bending press, a crankshaft 3 is provided at the lower end of the lower frame 5 and is provided with an opening / closing crankpin 13 for moving the arcuate rod 7 up and down and a bending crankpin 19 for moving the main link 15 up and down. Therefore, when the bow-shaped connecting rod 7 descends, the pressing die 2 is pressed onto the receiving die 25.
The work W, which is held down by 6, is further held by the rotation of the crankshaft 3, which is mainly accompanied by elastic deformation of the arcuate rod 7, and the blade 1 takes a trajectory to bend the work W in the rotation range β. C type, which is configured in such a manner that the open / close crank pin 13 and the bending crank pin 19 have respective rotation ranges β in the vicinity of their respective dead points Pa and Pb. Bending press machine.