KR19990023887A - Machine for making bent metal sheet panels - Google Patents

Abstract

Machine for the production of metal sheet panels with bent edges, comprising a work surface (1) for a sheet to be machined, a bending press (2) provided with a bending die and located frontally to the work plane, a mechanical hand (4) mobile as regards the work plane for the displacement of the sheet (5) during machining, characterised in that the work plane is substantially enclosed inside a protection structure (6), said protection structure comprising at least one access opening (7) to the work plane for the feeding to and the removal of the sheet from the work surface on behalf of a human operator, and in that said at least one access opening (7) is associated to respective means (8) for the interdiction of the access to the work plane during machining. <IMAGE>

Description

Machine for making bent metal sheet panels

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine for making a sheet metal panel having a curved edge, commonly referred to as a panel machine.

In particular, the present invention has a single bending die and is generally described, for example, in US Patent No. N. 4242898, in which corners are curved one or more times on one or more of the four sides of the rectangular metal sheet. The present invention relates to a panel machine for obtaining a metal sheet of one kind.

Panels of this kind are widely used in cabinets, refrigerators, washing machines, air conditioners and general shelves.

The panel machine includes a work plane on which a metal sheet (panel) to be machined is placed, a bending press disposed at the front of the work plane and provided with a bending die, and a sheet which is machined during operation. A mechanical hand mobile to move the ball relative to the work plane, an automatic seat feeder disposed on the side of the work plane, and to transport the seat from the feeder toward the work plane and upon completion of the machine operation. It includes a carriage that removes the curved sheet from the workplane.

A conveyor carriage carries the sheet from the feeder, placing it on the work plane. The machine hand carries the seat to its substantial center and moves the seat so that each side of the seat to be bent is properly positioned in turn at the corresponding bending press. As soon as the machine operation is completed, the machine hand drops the seat and the carriage is removed from the work plane.

Therefore, all operations of the panel machine are automated, in particular the feeding and removing of the machined sheets.

In order not to interfere with the operation of the carriage, the feeder and the carriage facilitate substantially access from the outside to the operating area (ie the work plane) during machine operation.

A light scan device (laser scanner) which stops the operation of the panel machine at any time or in any case where an unidentified object is approaching the operating area in order to reliably meet the requirements according to the current regulations. A laser scanner or photocell is installed.

However, although such a panel machine is quite effective, there is a problem in that the configuration is quite complicated in order to realize the accuracy of the automation, which results in high cost.

In order to solve the above-mentioned problems of the prior art, it is an object of the present invention to provide a low cost and simple configuration panel machine that satisfactorily satisfies the requirements according to the current regulations.

1 is a schematic view of a panel machine surrounded by a protective structure according to the invention.

FIG. 2 is a schematic diagram of a panel machine with the protective structure partially removed from the panel machine shown in FIG.

FIG. 3 shows an enlarged view of the door covering the opening for access to the protective structure of the panel machine shown in FIG.

4 is a cross-sectional view taken along the vertical center plane of the panel machine shown in FIG.

FIG. 5 shows in more detail the device for centrally placing a sheet on the work plane for each movement mechanism.

Explanation of symbols for main parts of drawing

1: Work Plane 2: Bending Press

4: machine hand 5: machined sheet

6: protective structure 7: access opening

8 door 9 carriage

12: hydraulic vise 13, 14: jaw

16: rotor 19: thrust means

21, 22: wings 29, 30: cancer

38: reference element

According to the present invention, a panel machine capable of achieving the above object comprises: a work plane on which a sheet to be machined is placed; A bending press disposed in front of the work plane and provided with a bending die; And a movable machine hand capable of changing the position of the seat relative to the workplane during machine operation, the workplane being substantially enclosed within the protective structure, the protective structure being the workplane instead of the operator. And at least one opening that facilitates access to the workplane for feeding and removing the sheet on the surface of the at least one access opening, the at least one access opening for each restraining means preventing access to the workplane during machine operation. There is a characteristic connected with.

According to a preferred embodiment of the present invention, the restraining means comprises a door mounted on a protective structure corresponding to the access opening. The door is selectively opened by the operator for feeding and removal of the seat and can optionally be closed during machine operation. The door also forms a physical obstruction to restrain access to the work plane during machine operation.

Further, the restraining means may be constituted by a light scanning device such as a photocell or a laser scanner, which serves for the purpose of stopping an operation in which case an unidentified object attempts to access the work plane through access to a door during machine operation. Can be.

In the panel machine according to the present invention, since the automatic feeder and carriage for seat conveyance are not installed, the construction is certainly less complicated than the conventional panel machine. As a result, the panel machine is also cheaper to manufacture, and the workplane is surrounded by a protective structure (physical) consisting of, for example, a barrier consisting of a sheet in which a window is preferably installed. In addition, the operating area of the metal sheet can be completely separated from the outside during the machine operation. Feeding and removal of the sheet on the workpiece surface is effected by an operator through an access opening installed in the protective structure. The restraining means corresponding to the access opening can ensure the safety of the operator.

Features and advantages of the present invention will be more clearly understood through the preferred embodiments of the present invention, which will be described in detail below, and are not limited to the following embodiments which are the present invention.

A panel machine according to the invention is shown with reference to FIGS. 1 and 2. The panel machine is designed for the work plane 1 on which the machined seat 5 is placed, the bending press 2 placed in front of the work plane 1 and the bending die (to be described in more detail later) and the position of the seat 5 during machine operation. A movable machine hand 4 which can be changed with respect to 1, and a protective structure 6 which encloses the work plane 1 together with the machine hand 4 and the bending press 2, preferably consists of sheets with windows installed. In this embodiment, inside the protective structure 6, two openings 7 are provided on both sides of the work plane 1 to facilitate access to the operating area, so that the operator inserts a sheet 5 machined into the work plane 1. And remove the sheet as soon as the machine operation is completed. In this embodiment, the access opening is fixedly coupled to a supporting frame, not shown for space reasons within the protective structure 6, and connected to each door 8 shown enlarged in FIG. It becomes rotatable about the center. Preferably, in order to facilitate opening and closing of the door 8, a conventional gas cylinder (not shown) may be installed.

In this embodiment, the protective structure 6 includes two openings for access to the work plane 1, and any of the two openings can access the work plane 1. Therefore, it is also possible to provide a single access opening.

The structure and relative operating method of the bending press 2 and the machine hand 4 will be described later in more detail with reference to FIGS. 4 and 5, in which the protective structure 6 is not shown for reasons of space.

In the recognized method, the machine hand 4 comprises a spherical carriage indicated by reference numeral 9 suitable as an arch press. This carriage 9 is supported by a longitudinal slit 3 in a straight horizontal guide 10 which is supported by a bed 11 above the floor and extends vertically forward of the bending press 2. It is movable about. The carriage 9 is movable by the fluid machine cylinder 50 along the guide 10 towards the bending press 2 or in a direction away from the bending press 2. As shown in FIG. 4, the carriage 9 supports hydraulic vices 12 with coaxially overlapped lower jaws 13 and upper jaws 14, which are machined between them. It has opposing flat and horizontal walls suitable for tightening and securing the sheet. The lower basin 13 is rigidly mounted on top of a horizontal shaft 15 mounted to rotate by a rotator 16 mounted to the bottom of the carriage 9, the shaft 15 and the lower basin 13 being in one direction and facing each other. Angular movement can be carried out in the directions of 90 ° and 180 °. The upper jaw 14 is rigidly mounted to the lower end of the vertical shaft 17 which is supported to be rotated in idle mode by a bracket arm 51 which is alternately supported in a sliding vertical path by the upper end of the carriage 9. . Lowering and raising the bracket arm 51, thereby lowering and raising the upper jaw 14, is performed by a fluid machine cylinder, not shown in the drawing, by tightening or releasing the sheet 5 machined between the jaws 13 and 14. Is implemented. The shaft 17 must be slowly rotated about the jaw 14, which must cooperate with the jaw 13 to tighten and secure its axis, the seat 5, in order to keep the rotation of the seat 5 by the rotor 16.

The machine hand 4 also comprises thrust means 19 arranged in different operating positions in FIGS. 2 and 4. This thrust means 19 is entirely movable by the carriage 9 and is also individually movable by each fluid machine cylinder 52 and slides on a slide formed at the lower end of the carriage 9. When the thrust means 19 are at rest, the thrust means 19 substantially corresponds to the throat of the carriage (arch press) 9; By moving forward along the slide toward the bending press 2 under the operation of the cylinder 52, the thrust means 19 are arranged in contact with the back edge of the machined sheet, with the position automatic correction of the seat 5 being described later in more detail.

The bending press 2 includes a bearing structure having a lower wing 21 and an upper wing 22 in a substantially C-shaped part. The lower blade 21 is located on the floor, and the upper blade 22 is strongly fixed to the lower blade 21 corresponding to the flange 23 disposed on the rear surface of the bending press, so that it can be rotated about the horizontal axis represented by A. FIG. The rotation of the upper blade 22 about axis A is caused by the cylinder-piston unit 24, which has at least a vertical rod 25 (shown schematically with points and lines) which serves as a guide for the movement of the upper blade 22. One is installed. In front of the lower wing 21, a vertical support 26 having a flat horizontal plane without obstacles arranged at the same height as the work plane 1 is fixed, thereby forming a lower blank holder. On the front of the upper blade 22, a blank holder 27 extending vertically toward the bottom is fixed, and the blank holder 27 has a lower blank for tightening and fixing the sheet near the bend edge of the machined sheet. There is a flat bottom surface free of obstacles suitable for cooperating with the top surface of the holder.

In the space between the upper blade 22 and the lower blade 21, a bending blade holder 28 having a substantially C-shaped cross section is accommodated. The blade holder 28 includes a lower arm 29 and an upper arm 30 extending forward of the bending press 2. The lower bending blade 34 is fixed to the distal end of the lower arm 29, and the upper bending blade 35 is fixed to the upper arm 30. On the back, the blade holder 28 is fixed to the torsion bar 31, which rotates about the axis represented by C. In addition, the torsion bar 31 is rotatable about a horizontal axis, denoted B, under the operation of the fluid machine cylinder, which is shown schematically by point and line only by the rod 32. The fluid machine cylinder (rod 33 is shown schematically in points and lines) causes the rotation of the bladeholder 28 about axis C. The combination of rotation of the torsion bar 31 about the axis B, which determines the position of the rotation axis C of the blade holder 28, and the rotation of the blade holder 28 about the axis C, are bent at various angles on both the upper and lower sides. To allow their various movements.

In front of the support 26, a recognized reference-bearing block 36 having a flat horizontal plane 37 at the same height as the work plane 1 is placed inside the reference element 38 shown in FIGS. 1 and 2. It is mounted. The block 36 is movable in a direction perpendicular to the front of the bending press 2, so that it can move toward or away from the bending press. In addition, the reference element 38, which can normally be folded into the interior of the block 36 during machining of the sheet, may protrude from the surface 37. In addition, since the reference element 38 may move in a direction parallel to the front of the bending press, the reference element 38 may move toward each other or in a direction away from each other.

As shown in Fig. 5, each reference element 38 (stop position is shown in a continuous line, and the operating position is folded and protruded in a point and line) is an angle mounted on an endless screw 39. It is rotatably supported by the carriage 61 and extends parallel to the front of the bending press 2 and is folded into the interior of the pulley 62 which is in turn rotated by the motor 60 via the belt 63. Therefore, the carriage 61 can move in a direction parallel to the front side of the bending press. Parallel to the circulation screw 39, a bar 64 extends to form the axis of rotation of the reference element 38. Due to the cylinder-piston unit 65, which is fixed to the reference bearing block 36 and with the vertical rod 65 fixed to the reference element 38, the reference element 38 rotates around the bar 64, and the reference element 38 from the reference bearing block 36 This will fold into or protrude into.

The operation of the panel machine described above will be explained.

First, the operator picks up the sheet to be machined, opens the door 8 to place it on the work plane 1, and places the machined sheet on the work plane 1 in a suitable position, approximately in the center part. The operator then closes door 8 and operates the panel machine. The machine hand 4, which is located away from the bending press 2 and later lifted into the upper jaw 14, moves to the bending press 2. In the meantime, the thrust means 19 is operated by a relative cylinder 52 by pressing the machined sheet towards the bending press 2 which is in contact with the back edge of the machined sheet, and is operated by the relative cylinder 52 and forward of the bending press 2. Will move along the slide. At the same time, the two collapsible reference elements 38 protrude so that the front edge of the sheet pressed by the thrust means 19 is in contact with the reference element 38. The shape of the reference element 38 makes it possible to center the sheet in a direction parallel to the front of the bending press, regardless of whether the edge of the machined sheet is cut off. In a direction parallel to the front side of the bending press, the reference element 38 has the mobility to center sheets of various dimensions. Therefore, the operator does not have to worry about positioning the sheet in the correct way and on the work plane.

At this point, since there are no obstacles during the following mechanical operation steps, the reference element 38 is folded in, and the thrust means 19 returns to the stop position. The upper jaw 14 descends and cooperates with the lower jaw 13 to support the seat in a substantially central position. Therefore, machine hand 4 moves the seat from the front towards the bending press. The upper blade 22 is lifted up, and the upper blank holder is separated from the lower blank holder 26 by a sufficient distance to become the passage of the seat. When the machined sheet is introduced into the bending press, the cylinder 24 lowers the upper blade 22 so that the upper blank holder 27 presses down the rim of the machined sheet with the lower blank holder 26 protruding into the lower press holder. . In this regard, the cylinders indicated by the reference numerals 32 and 33 in FIG. 4 are installed so that the blade holder 28 is moved, and the bending blades 34 and 35 cooperate with the blank holders 26 and 27 to bend the edges of the seat. When the rim of the sheet is bent in a preferred manner, the upper blade 22 of the bending sheet is lifted and the sheet is free from the support of the upper blank holder 27. The sheet is removed from the bending press, the machine hand 4 is moved backwards, and when the edge of the sheet is bent, the machine hand 4 performs rotation of the sheet at 90 ° or 180 ° by the rotor 16. When the seat is rotated in the preferred manner, the machine hand 4 puts the edge of the machined sheet back into the bending press and moves it forward and repeats the above-described operation.

In the final step of sheet processing, the operator stops the machine and opens door 8 to remove the sheet from the work plane. Then take a new seat and place it in a suitable place on the work plane, close door 8 and start the machine.

As described above, in the panel machine according to the present invention, the configuration is certainly less complicated than the conventional panel machine since the automatic feeder and the carriage for seat conveyance are not installed. As a result, the panel machine is also cheaper to manufacture, and the workplane is surrounded by a protective structure consisting of a sheet in which the window is preferably installed.

In addition, the operating area of the metal sheet can be completely separated from the outside during machine operation. In addition, the feeding and removing of the sheet of the workpiece surface is effected through an access opening installed in the protective structure by the operator. As a result, the safety of the operator can be ensured due to the restraining means corresponding to the access opening.

Claims (7)

A work plane 1 on which the sheet 5 to be machined is placed; A bending press (2) disposed at the front of the work plane (1) and provided with a bending die; And A machine for making a bent metal sheet panel comprising a movable machine hand (4) capable of changing the position of the seat (5) with respect to the workpiece plane (1) during machine operation, The workplane 1 is substantially enclosed within the protective structure 6, The protective structure 6 comprises at least one opening 7 which facilitates access to the workpiece 1 for feeding and removing the sheet 5 on the surface of the workpiece 1 instead of the operator. Doing The at least one access opening (7) is connected to respective restraining means (8) which prevents access to the work plane (1) during machine operation. 2. The access restraining means (8) to the work plane (1) according to claim 1, comprising a door (8) connected to the opening (7), the door (8) operating before and after the machine operation. Panel for opening and removal of the seat (5), and closed to prevent access to the workpiece (1) during machine operation. 3. Panel machine according to claim 2, characterized in that the door (8) is mounted in the protective structure (6) corresponding to the opening (7) and rotates about a horizontal axis. The method according to any one of claims 1 to 3, wherein the position of the sheet (5) is automatically set after the machined sheet (5) is inserted into the workpiece plane (1) by an operator. Panel machine comprising a seat positioning means (19, 38). 5. A seat according to claim 4, wherein the positioning means (19, 38) of the seat can be normally folded about the upper surface of the work plane (1), and is engaged with the front edge of the panel machine. A collapsible reference element 38 suitable for protruding relative to the top surface of the work plane 1 during the positioning step; And movable thrust means (19) engaged with the back edge of the sheet (5) to push the front edge of the sheet (5) against the reference element (38). A panel machine as claimed in claim 5, comprising a pair of collapsible reference elements (38). 7. A machine according to any one of the preceding claims, wherein the machine hand (4) is movable in a direction towards the bending press (2) / away from the bending press (2), and at its substantial center. A vise 12 suitable for tightening and securing the machined sheet 5 in position and a rotor 16 suitable for rotating the sheet 5 in the workpiece plane 1. Panel machine.