JPH05200599A - Sheet metal processing machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a sheet metal working machine capable of efficiently reducing noise due to breakthrough at low cost. [Structure] A frame 1a of a machine body 1 is composed of a center plate 1b and side plates 1c provided on both sides of the center plate 1b, and a pressing force for generating a frictional force by pressing the center plate 1b and the side plates 1c together. By providing a means, the load acting on the center frame at the time of machining the work is detected by the load detecting means, and the pressurizing means is controlled according to the load, the impact generated by the breakthrough is caused by the center plate 1b. It is designed to be attenuated by the frictional force of the side plate 1c,
Noise generated by breakthrough can be efficiently reduced with a simple configuration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet metal working machine in which noise generated by breakthrough is reduced.

[0002]

2. Description of the Related Art In a sheet metal working machine such as a blanking press or a turret punch press which mainly punches a plate-like work, a noise larger than that of the machine body is generated due to an impact or a vibration generated at the time of punching the work. .. For example, in the case of a turret punch press as shown in FIG. 1, first, a touch sound is generated when the stripper a comes into contact with the work b as shown in FIG. 2A, and then as shown in FIG. When the punch c comes into contact with the work b, a touch sound is generated.

Further, as shown in FIG. 2C, a shearing noise is generated during the shearing, and at the time of punching the work shown in FIG. 2D, the energy accumulated in the machine body d is sharply increased. By being released (breakthrough), a louder noise than the machine body d is generated, which causes deterioration of the working environment. In order to improve the above problems, various methods for reducing noise due to breakthrough have been conventionally proposed. For example, JP-A-57-118828, JP-A-62-183919, etc.

[0004]

However, the conventional method has a drawback that the structure is complicated such that the shock due to the breakthrough is damped by the shock damping device, and the cost is high. The present invention has been made to solve the above problems, and an object of the present invention is to provide a sheet metal working machine capable of efficiently reducing noise due to breakthrough at low cost.

[0005]

In order to achieve the above-mentioned object, the present invention comprises a frame of a machine body comprising a center plate and side plates provided on both sides of the center plate, and between the center plate and the side plates. By providing a pressurizing means for generating a frictional force by pressing, and detecting the load acting on the center frame during machining of the work by the load detecting means, and controlling the pressurizing means according to the load, a break is achieved. The impact generated by the through is attenuated by the frictional force between the center plate and the side plate.

[0006]

[Operation] With the above configuration, noise generated by breakthrough can be efficiently reduced, and the load detecting means, the pressurizing means, and the means for controlling the load detecting means can be simply configured, so that it can be provided at low cost.

[0007]

Embodiment An embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. FIG. 3 shows a sheet metal working machine such as a turret punch, and 1 shows a machine body. In the machine body 1, an upper turret 2 and a lower turret 3 are rotatably provided in an opening of a C-shaped frame 1a. A plurality of punches 4 and a die 5 are attached to the upper turret 2 and the lower turret 3 in the circumferential direction, and a striker 6a of a striker 6 including a hydraulic cylinder and a crank mechanism provided on the upper portion of the frame 1a. The punch 4 and the die 5 are hit by the punch 4 from above.
The plate-shaped work 7 can be punched between the two. Reference numeral 8 in the drawing denotes an XY carriage which moves the work 7 in the XY directions and positions the work 7 at the punching position.

On the other hand, the frame 1a of the machine main body 1 is composed of a C-shaped center plate 1b and side plates 1c provided on both sides of the center plate 1b, and these are connected to each other by connecting rods 10 provided at a plurality of places. Has been done. A wear plate 1d is provided for each connecting rod 10 between the center plate 1b and the side plate 1c, and a gap 1f is formed between the center plate 1b and the side plate 1c. , 3 are provided in the opening of the center plate 1b.

The pressure cylinder 12 is located on the side of one side plate 1c at the upper side of the opening of the frame 1a.
Is installed. The piston rod 12a protruding from the pressurizing cylinder 12 penetrates the side plate 1c and is loosely inserted into the through hole 1e formed in the center plate 1b, and the tip thereof penetrates the opposite side plate 1c. A stopper 12b provided at the tip is locked to the outer surface of the side plate 1c. A wear plate 1d is also interposed between the side plate 1c and the center plate 1b through which the piston rod 12a of the pressure cylinder 12 is inserted.

On the other hand, the striking device 6 is provided with a pressure sensor 15 for detecting the load at the time of striking by pressure, and the load detected by the pressure sensor 15 is input to the controller 16. The controller 16 converts the pressure input from the pressure sensor 15 into an electric signal to generate a control signal, and the control signal controls the pressure supplied into the pressurizing cylinder 12 via the electromagnetic proportional pressure control valve 17. It is like this.

Next, the operation will be described. The punch 4 hit by the hitting element 6a descends, and the punch 4 and the die 5 are moved.
When the punching of the work 7 is started in the interval, the center frame 1b is elastically deformed upward by ε as shown by the phantom line in FIG. 1 due to the punching load, and so-called opening of the mouth occurs,
Since the punching load does not act on the side plate 1c,
Keep the original shape. After that, when the load becomes maximum, a control signal is sent from the electromagnetic proportional pressure control valve 17 from the controller 16 and the hydraulic pressure proportional to the load is supplied to the rod side of the pressurizing cylinder 12, so that the center plate 1b and the side plate. The plates 1c are pressed against each other via the wear plate 1d. After that, when the work 7 is punched out and a breakthrough occurs, the elastically deformed center plate 1b tries to return to its original position, but the space between the center plate 1b and the side plate 1c is pressed by the pressure cylinder 12 via the wear plate 1d. Center plate 1b because it is pressed
A frictional force μF is generated between the side plate 1c and the side plate 1c, and the breakthrough is damped and absorbed by the frictional force μF. As a result, noise due to breakthrough can be reduced.

Since the wear plate 1d is worn during long-term use, the wear plate 1d has a structure that can be easily replaced. The center plate 1b and the side plate 1c are integrated by welding or bolting each other in the lower range A, and when the striking device 6 is a crank mechanism or the like, the punch 4 is used.
A control signal for controlling the pressurizing cylinder 12 may be generated by detecting the position of. Further, the means for pressurizing the center plate 1b and the side plate 1c to each other may of course be a pressurizing means other than the cylinder, and noise may be generated if the gap 1f between the center plate 1b and the side plate 1c is filled with viscoelastic rubber or plastic. The reduction effect is further improved. Further, although the above embodiment is a case of a turret punch press, it can be applied to all sheet metal working machines that generate breakthrough.

[0013]

As described above in detail, according to the present invention, the center plate and the side plate are pressed against each other by the pressurizing means to generate a frictional force. As a result, it is possible to significantly reduce noise due to breakthrough.
Further, by controlling the pressurizing means according to the load, noise due to breakthrough can be efficiently reduced, and the noise can be reduced because the load detecting means, the pressurizing means and the means for controlling this can be simply configured. A sheet metal working machine can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a side view showing a conventional sheet metal working machine.

FIG. 2 is an explanatory diagram illustrating a noise mechanism of a conventional sheet metal working machine.

FIG. 3 is a configuration diagram of a sheet metal working machine according to an embodiment of the present invention.

FIG. 4 is a view from the direction B in FIG.

5 is a view from the direction C in FIG.

[Explanation of symbols]

1 ... Machine main body, 1a ... Frame, 1b ... Center plate, 1c ... Side plate, 1d ... Wear plate, 1
f ... gap.

Claims (3)

[Claims] 1. A frame 1a of a machine body 1 comprises a center plate 1b and side plates 1c provided on both sides of the center plate 1b, and a friction force is generated by press-contacting between the center plate 1b and the side plates 1c. By providing a pressurizing means, the load acting on the center frame during machining of the workpiece is detected by the load detecting means, and the pressurizing means is controlled according to the load, so that the impact generated by breakthrough is applied to the center plate. A sheet metal working machine characterized by being attenuated by a frictional force between 1b and a side plate 1c. 2. A center plate 1b and a side plate 1
The sheet metal working machine according to claim 1, wherein an interchangeable wear plate 1d is interposed between c and c. 3. The sheet metal working machine according to claim 1, wherein a viscoelastic body is filled in a gap 1f between the center plate 1b and the side plate 1c generated by the wear plate 1d.