JPH0452099A - Press - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a press comprising a frame having a C-shaped side surface, a bed attached to the lower jaw, and a slide attached to the upper jaw. Machines, particularly press machines with reinforced sight frames.

[Conventional technology]

FIG. 3 shows a press machine to which the present invention is applied. In order to improve the rigidity of the opening of the frame 2 of the conventional press machine 1, a reinforcing plate fixed to the inner surface of the side frame was used. As shown in FIG.
The reinforcing plate 3 was welded to the inner surface between the side frame 4 and the bed 6, and vertical and horizontal ribs 8 were welded to the inner surface of the side frame 4 for reinforcement.

[Problem to be solved by the invention]

In order to reduce the noise emitted from the frame 2 of a press machine, it is necessary to increase the opening rigidity of the frame 2 and the rigidity in the outward direction of the frame plate, but the conventional means for increasing these rigidities are as described above. As such, each was taken separately.

For this reason, if both measures are used, that is, increasing the thickness of the reinforcing plate 3 of the sight frame 4 or welding the reinforcing plate 3 and ribs 8 to the inner surface of the side frame 4, the weight will increase significantly, and it will be difficult to manufacture. There were also problems such as high cost.

In view of the above, the present invention is lighter in weight, has higher rigidity than conventional structures, can reduce vibration and noise, and can further reduce costs. The purpose is to provide a press machine with a high degree of freedom in working methods.

[Means to solve the problem]

In order to achieve the above object, the present inventors have elucidated the mechanism of vibration and noise generation in breather machines.

In FIG. 3, first, the slide 9 is lowered by the rotation of the main shaft, and the upper die (nokunchi) 10 fixed thereto is placed on the bed 6.
When the workpiece (not shown) to be punched on the lower die 11 attached to the upper bolster 6a is reached, the upper die 1
A touch sound is generated due to the contact between the 0 and the workpiece.

This touch sound is small compared to the breakthrough sound described later, and can be ignored at present.

Next, when the upper mold 10 further descends, the force of the upper mold 10 (as it descends, the upper mold 10 bites into the workpiece, the press machine receives the shear resistance at this time, and the frame 2 is applied between the upper mold 10 and the lower mold 1). There is a force that makes you open your mouth.

When the amount of biting reaches a certain value, cracks occur in the workpiece and it suddenly breaks. Due to this breakage, the load that had been applied until then is released, and the unloading impact is propagated throughout the press machine, generating vibration and noise. The sound generated at this time is called a breakthrough sound in contrast to the above-mentioned touch sound.

FIG. 5 shows the relationship between the noise generated by the press machine and the punching load. As the punching force increases, the opening amount of the press machine increases, and the unloading impact increases. This is a major cause of increased noise.

FIG. 6 shows the manner in which the U-shaped frame is deformed to open its mouth using chain lines, and the relationship of the above-mentioned displacement with respect to time at this time is as shown in FIG. 7. In this Figure 7,
Curve a is for the conventional frame, where the displacement is large;
Therefore, the vibration width was large.

From the above, in order to reduce breakthrough noise, it is sufficient to increase the frame rigidity by reducing the opening amount when loaded, and most of the breakthrough noise is due to vibration of the side frame when unloading. This shows that breakthrough sound can be reduced by reducing the area of the side frame.

From the above, the breather machine according to the present invention is a breather machine in which the side surface of the frame is formed in a C shape, the bed is attached to the lower jaw part, and the drive system is attached to the upper jaw part. The rear parts of the left and right side frames, except for the base mounting part, the drive system mounting part, and the C-shaped part connecting them, have a lattice-like beam structure.

[For production]

The opening load is received by the lattice-like beam structure on the rear side of the side frame. Furthermore, the rust-like beam structure reduces the substantial area of the side frame, reducing breakthrough noise.

〔Example〕

Embodiments of the present invention will be described based on FIGS. 1 and 2.

Fig. 1 shows the left side frame 12 that constitutes one side of the frame.This side frame 12 has a section 13 for mounting the bed, a section 14 for mounting the drive system such as a slide, and these sections. Space parts 1 are formed by punching or the like in multiple places in the rear part of these parts except for the connecting C-shaped part 15.
6 is provided, whereby the front side of the side frame 12 consisting of a portion 13 for mounting the bed, a portion 14 for mounting the drive system, and a C-shaped portion 15, and a rear end portion of the side frame 12 are provided with a plurality of beam members. The structure is connected at 17. Further, the upper and lower corners of the rear end of the side frame 12 and the lower corner of the front side are cut out in an arc shape.

Figure 2 schematically shows the configuration shown in Figure 1.
The rear side portion of the side frame 12 that is continuous with the front side portion has a lattice-like beam structure.

In the above configuration, the opening load acting on the side frame 12 is received by the lattice-like beam structure on the rear side of the side frame 12.

At this time, the vibration with respect to time became as shown by the curve in FIG. 7, and was smaller than that of the conventional one. This is because the area of the side frame 12 has become smaller, thereby reducing the breakthrough sound.

In addition, in the above structure, since the parts that have little influence on frame rigidity are punched out and removed, there is no decrease in the rigidity of the side frame, and the area of the side frame 12 is reduced, reducing the area where noise is generated. Become.

The part that remains after punching has a lattice-like beam structure, resulting in a lightweight and highly rigid structure, which reduces the opening amount under the same load and reduces vibration.
Less noise is generated.

Furthermore, if the weight is the same as that of a conventional press machine, even higher rigidity can be achieved, and the working accuracy of the press machine can be improved.

Further, the lattice structure portion may be constructed by punching out a single plate, or may be constructed by joining a plurality of beam members together by welding, and may be manufactured using any working method.

〔Effect of the invention〕

According to the present invention, compared to conventional configurations, it is lightweight, has high rigidity, and can reduce vibration and noise. Furthermore, it has effects such as being able to reduce costs and having a high degree of freedom in manufacturing methods.

[Brief explanation of drawings]

FIG. 1 is a side view showing one embodiment of the present invention, and FIG. 2 is a schematic diagram thereof. FIG. 3 is a perspective view showing a press machine to which the present invention is applied, FIG. 4 is a cutaway perspective view showing a conventional example, FIG. 5 is a diagram showing the relationship between punching load and noise, and FIG.
The figure is an explanatory diagram showing the opening deformation of the frame, and FIG. 7 is a diagram showing the displacement with respect to time. 1 is a press machine, 2 is a frame, 12 is a side frame, and 17 is a beam member. Figure Figure Punching load Figure Figure

Claims (1)

[Claims] In a press machine in which the frame has a C-shaped side surface, a bed is attached to the lower jaw, and a drive system is attached to the upper jaw, the bed mounting portions of the left and right side frames forming both sides of the frame are A press machine characterized in that the drive system mounting part and the rear part thereof except for the C-shaped part connecting the drive system mounting part have a lattice-like beam structure.