JPH05115924A - Bending machine for thin metal plate - Google Patents

Abstract

PURPOSE: To provide a sheet-metal bending machine which is almost free from any operational problems by fixing a cam device to a mobile frame, and fitting it to a rotatable shaft in both directions in the reciprocating stroke. CONSTITUTION: A mobile frame 9 having an approximately C-shaped section is supported by a supporting structure. An upper blade 10 and a lower blade 11 are supported by the mobile frame 9, and a sheet-metal material 4 is bent while the movable frame is elevated/lowered. A cam device 14 is firmly fixed to the mobile frame 9 through a connection element 16. The cam device 14 is fitted to a shaft 13 rotatable in both directions in the reciprocating stroke to be determined by a specified moving stage. A bending machine which is simple in structure and action, and extremely economical in operation can be provided thereby.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal sheet bending machine. This bending machine is particularly suitable for bending metal sheets made of stainless steel having a different thickness and having a satin finish, pre-painted sheets, or plastic-coated sheets. These thin plates are widely used, for example, in the construction of metal furniture, and should be free from defects in the coating and protective layer in the bending area of the thin plates, such as in the case of home appliances and shelves.

[0002]

BACKGROUND OF THE INVENTION In the prior art, various types of sheet metal bending machines have been provided which can avoid the creation of defects in the bending area. These processing machines consist of one fixed lower element on which the sheet material to be bent (hereinafter simply called the sheet) is placed, and one movable upper element which keeps the sheet pressed against this lower element. A fixed support structure having two pressing elements consisting of: One movable frame body having a substantially C-shaped cross section is incorporated in the fixed element. The frame body comprises two blades, one upper blade and one lower blade. These blades perform bending of the sheet as the movable frame body moves up and down.

Avoiding the creation of defects in the bending area,
In order to be able to perform bending at different angles and rounding of the bending angle, the movement of the movable frame body has been devised in both the separating direction and the approaching direction with respect to the sheet to be bent. .. In the prior art, there is provided a first type of processing machine which realizes the above-mentioned operation by using a manual adjusting device. A well-known problem with this type of processing machine is that whether or not bending is properly performed depends largely on the ability of the worker.

The prior art also provides a second type of machine in which the bending blades move away from and toward the sheet so that each blade operates independently. As is well known, this processing machine is extremely complicated in terms of structure. In addition, this processing machine
Control is difficult in that two movement directions (one for each bending blade) must be managed, which is extremely complicated and expensive.

Further, the prior art provides a third type of processing machine in which the movement of the blade toward and away from the blade is performed by the entire movable frame body. In this processing machine, the operating device is composed of a hydraulic cylinder. A well-known problem in this type of processing machine is that the hydraulic cylinder cannot carry out minute movements with extremely high precision. Therefore, in reality, the positioning accuracy of the movable frame body that supports the two blades is insufficient, and the management is difficult.

[0006]

SUMMARY OF THE INVENTION Therefore, the main object of the present invention is to overcome the above-mentioned problems of the bending machine based on the above-mentioned prior art, while avoiding generation of defects in the bending area. , With a simple structure, capable of bending sheets of different thickness and realizing a bending angle that enables rounding, has extremely precise and reliable operability, and An object of the present invention is to provide a metal sheet bending machine that is easy to manage and can be automatically operated.

[0007]

In order to achieve the above object, the present invention provides a lower pressing element on which a sheet material to be pressed is arranged, and a fixed type supporting structure for supporting the lower pressing element. And a movable upper pressing element that is combined with the lower pressing element and presses the thin plate material that is pressed and pressed against the lower pressing element, and a movable structure that supports the upper pressing element. In a thin plate bending machine, a movable frame body having a substantially C-shaped cross section supported by the support structure, and a bending process of the thin plate material supported by the movable frame body and moving up or down the movable frame body. Upper blade and lower blade, driving means for raising or lowering the movable frame body, and displacing the movable frame body in a separating direction and an approaching direction with respect to the thin plate material. And a drive unit that is firmly fixed to the movable frame body via a connecting element and that is mounted on a shaft that is bidirectionally rotatable in a reciprocating stroke determined by a predetermined operation step. Provided is a thin metal sheet bending machine having one cam device.
Other features and advantages of the invention will be more clearly understood from the following detailed description of preferred and non-exclusive embodiments, given as non-limiting examples in the accompanying drawings.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, a support structure 1 has a chamber 2 therein. The support structure 1 also comprises a lower pressing element 3 on which the sheet 4 to be bent is placed. The lower pressing element 3 is combined with a movable upper pressing element 5 that presses the sheet 4 against the lower pressing element 3. The upper pressing element 5 is supported by a movable structure 6 hinged to the support structure 1 at a hinged part 7. The support structure 1 can reciprocate in a vertical plane by driving at least one double-acting hydraulic cylinder 8 fixed to each of the movable structure 6 and the support structure 1.

Inside the chamber 2, a movable frame body 9 is provided.
Is housed. The movable frame body 9 has a substantially C-shaped cross section and supports the upper blade 10 and the lower blade 11. The upper blade 10 and the lower blade 11 perform bending of the seat 4 when the movable frame body 9 is raised or lowered. That is, the upper blade 10
Alternatively, the lower blade 11 interferes with the sheet 4 near the area where the sheet emerges between the lower pressing element 3 and the upper pressing element 5, thereby performing the bending process. here,
The upper blade 10 is bent downward, and the lower blade 11 is bent upward.

The vertical movement of the movable frame body 9 is performed by at least one double-acting hydraulic cylinder 12 fixed to both the movable frame body 9 and the support structure 1. The movable frame body 9 is rotatably supported by a shaft 13 arranged at the rear portion of the support structure 1, and can be horizontally displaced in a separating direction and an approaching direction with respect to the seat 4 by a special drive device. it can. The drive device comprises at least one cam device 14. The cam device 14 has a shaft 1
3 formed by a plate element 15 keyed to 3. The shaft 13 has a connecting element 1 for the movable frame body 9.
6 is firmly fixed.

Therefore, the movable frame body 9 is attached to the cam device 14
Swivel on shaft 13 via. The shaft 13 driven by known means is bidirectional with a reciprocating stroke determined by predetermined operating steps controlled by a computer (not shown), such as 100 ° in one direction and 100 ° in the opposite direction. Can rotate. The computer further manages all other operations of the machine and allows programmable operation according to fully automated operating requirements.

In FIGS. 3-6, the four bending steps of the sheet 4 are shown by way of example. FIG. 3 shows the moment of positioning of the lower blade 11 with respect to the seat 4. In FIG. 4, the vertical movement of the lower blade 11 which results in the formation of a bend of 90 degrees or more is shown.

FIG. 5 shows the horizontal movement of the lower blade 11 (caused by the rotation of the shaft 13 and the cam device 14) resulting in the formation of a 90 degree bend. In FIG. 6 a further horizontal displacement of the lower blade 11 is shown, which results in the formation of bends of less than 90 degrees.

[0014]

The bending machine according to the invention has the advantages that it is very simple in terms of structure and operation, is therefore very economical to operate and causes few operational problems. Therefore, the present invention achieves the above objects.

[Brief description of drawings]

FIG. 1 is a schematic side view of a bending machine according to an embodiment of the present invention, which is shown without a side cover.

FIG. 2 is a rear isometric view of the bending machine of FIG. 1, shown with some parts removed.

FIG. 3 is a diagram schematically illustrating a first stage of sheet bending performed by a lower blade.

FIG. 4 is a view schematically showing a second stage of sheet bending performed by a lower blade.

FIG. 5 is a view schematically showing a third stage of sheet bending performed by a lower blade.

FIG. 6 is a view schematically showing a fourth step of bending a sheet performed by a lower blade.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Fixed support structure 3 ... Lower pressing element 4 ... Sheet 5 ... Upper pressing element 9 ... Movable frame body 10 ... Upper blade 11 ... Lower blade 13 ... Shaft 14 ... Cam device 16 ... Connecting element

Claims (4)

[Claims] 1. A lower pressing element (3) on which a sheet material (4) to be pressed is placed, a fixed support structure (1) for supporting said lower pressing element (3), and said lower part. A movable upper pressing element (5), which is combined with the pressing element (3) and presses the pressed sheet material (4) against the lower pressing element (3), and the upper pressing element (5). And a movable structure (6) for supporting the movable frame (9), the movable frame body (9) having a substantially C-shaped cross section supported by the supporting structure (1), and the movable frame. An upper blade (10) and a lower blade (1) which are supported by the body (9) and bend the thin plate material (4) when the movable frame body (9) is raised or lowered.
1), a drive means (12) for raising or lowering the movable frame body (9), and a drive device for displacing the movable frame body (9) in a separating direction and an approaching direction with respect to the thin plate material (4). The drive device is firmly fixed to the movable frame body (9) via a connecting element (16), and is bidirectionally rotatable in a reciprocating stroke determined by a predetermined operation stage. ) Mounted on at least one cam device (1
A metal thin plate bending machine equipped with 4). 2. The sheet metal bending machine according to claim 1, wherein the movable frame body (9) is pivotally attached to the shaft (13) at the position of the cam device (14). 3. The cam device (14) is provided with the shaft (1).
A sheet metal bending machine according to claim 1, comprising a plate element (15) keyed to 3). 4. The drive means (12) for raising or lowering the movable frame body (9) is fixed to at least the movable frame body (9) and the fixed support structure (1), respectively. 2. The sheet metal bending machine according to claim 1, comprising one double-acting hydraulic cylinder (12).