JPH0433800A - Device for reducing punching sound in press - Google Patents

Abstract

PURPOSE:To reduce punching sound without lowering productivity by providing a resonance box for reducing the punching sound is pressing in a through hole of the slug in a frame in a press through a small duct having a required inner diameter and a required length. CONSTITUTION:The slug breaking out in punching work is taken outward from a taking out hole 45 through holes 33, 33A of the slug and a shooter 43 for taking out the slug. At the same time, when the punching sound which breaks out is introduced into a resonance box 35 having a volume V for reducing the punching sound through a small duct 37 having an inner diameter 2a, a length and resonated, the energy of the punching sound is consumed and, therefore, the punching sound is reduced. Generally, sound absorption material or noise insulating material is used, if necessary, inside the resonance box 35 for reducing this punching sound to improve the effect for reducing the punching sound.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention is directed to a press machine that is a source of noise, such as a press that reduces the noise generated when punching a material in a turret punch press. The present invention relates to a punching noise reduction device for a processing machine.

(Prior Art) Conventionally, the following methods have been adopted as soundproofing measures for press machines, which are a source of noise.

■Install a sound insulation cover around the noise source.

■Surround the noise source with a soundproof box.

■By slowing down the punching speed of the press machine, the noise energy generated per unit time is reduced, resulting in lower noise.

■Attach a shear angle to the mold of the press machine.

etc.

(Problems to be Solved by the Invention) By the way, each of the above soundproofing measures has the following drawbacks.

(2) and (2) increase the temperature inside the soundproof cover or soundproof box, deteriorating the working environment and reducing the work efficiency of workers working inside.

(2) Reducing the punching speed is not desirable because it reduces productivity.

■The amount of noise that can be reduced by not adding a shear angle to the mold is as follows:
It is very small, about a few phons. Another problem was that the mold could not be repolished.

SUMMARY OF THE INVENTION An object of the present invention is to provide a punching noise reduction device for a press machine that can reduce punching noise without reducing productivity, in order to improve the above-mentioned problems.

[Structure of the Invention (Means for Solving the Problems)] In order to achieve the above object, the present invention provides a method for passing a small conduit having a predetermined inner diameter and length into a punched waste passage hole in a frame of a press machine. This is a punching noise reduction device for a press machine, characterized in that it is equipped with a resonance box that reduces the punching noise of a material generated during press working.

(Function) By adopting the punching sound reduction device for a press machine of the present invention, a resonance box is installed in the punching waste passing hole in the frame of the press machine to reduce the sound of material punching during press work. By providing the hole through a small conduit having a length and length, punching noise can be reduced without reducing productivity.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

As shown in FIG. 2, the turret punch press main body 1 is
A frame body is constituted by a lower frame 5 having a plurality of legs 3 and an upper frame 11 supported on the lower frame 5 by support columns 9 via a working area 7. A punching section 15 for punching the plate material 13 is provided on one side (the left side in the figure) of the working section area 7 .

The punching section 15 includes a disc-shaped upper turret 17 rotatably mounted on the upper frame 11 and a disc-shaped upper turret 17 that is appropriately isolated from the upper turret 17 and rotatably mounted on the lower frame 5. shaped lower turret 17A
It is composed of etc. A plurality of punches (not shown) are removably attached to the upper turret 17.

The upper and lower turrets 17.17A are synchronously rotated in the same direction by a turret drive mechanism (not shown) and stopped at a predetermined position. In addition, the punch attached to the upper turret 17 is attached to the upper frame 1.
The punching is performed by a ram (not shown) that moves up and down via a ram actuating section 19 provided at 1.

A table 21 on which the plate material 13 is placed is mounted on the other side of the lower frame 5.

Further, the carriage 25 is mounted so as to be slidable in the same direction as the longitudinal direction of the carriage base 23, and the plurality of work clamps 27 are mounted so as to be movable and fixed in the moving direction of the carriage 25.

Therefore, the plate material 13 placed on the table 21 and having its ends held by the work clamps 27 is punched by the punching section 15. Note that 25A and 27A are a duct pipe attached to a holder (not shown), and a duct pipe connected to the duct pipe and connected to a dust collector (not shown).

FIG. 1 shows a schematic configuration diagram of a punching noise reduction device for a press machine, which is an embodiment of the present invention. In the figure, the punching sound reduction device 29 is a punching sound reduction resonance box 3 connected through a small conduit 37 provided in the passage hole 33A among the punching waste passage holes 33, 33A provided in the lower frame 5.
It consists of 5.

The punched waste passing hole 33.33A is formed in the lower frame 5.
an upper block 39 whose lower end is fixed to the upper surface of the lower base 31 and whose upper end touches the lower surface of the lower turret 17A;
The chute 43 is fixed to the lower surface of the
It vertically passes through the lower block 41 adjacent to the lower block 41, and has a cross-sectional area S0. It is a through hole with S (So〈S
).

Punching scraps generated during the punching process are carried out to the outside through the punching scrap passage hole 33, 33A and the punching scrap carrying chute 43 through the carrying-out hole 45. At the same time, the punching sound generated is introduced into a punching sound reduction resonance box 35 having a volume V through a small conduit 37 having an inner diameter 2a and a length, and when it resonates, the punching sound energy is consumed. This reduces punching noise. Note that X-X indicated by a chain line is a pass line of the material 13.

The energy loss (transmission loss) T, L, which is the amount of noise reduction due to the installation of this resonance box 35, is calculated by the following theoretical formula (1
) is calculated.

T, L, -101og [1+ 1/4-+q/
(f/rr-fr#) l 2] - (1) However,
T, L,: Transmission loss (dB) r r −C? / 2π
.

C0-2yr a” / (2lb+πa)ILb:
Conduit length (actual length + 0.6a)
(Cm)a: radius of conduit (ca+)C: speed of sound
(cm/s) C: Conductivity f: Frequency (Hz) f': Resonance box resonance frequency (Hz) ■: Resonance box volume
(cm 3) Normally, a sound absorbing material or a sound insulating material is used inside the punching sound reduction resonance box 35 as necessary to increase the punching sound reduction effect.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be modified as necessary by making appropriate design changes, for example, the number of punching sound reduction resonance boxes 35 is not limited to one. It is also possible to have more than one.

[Effects of the Invention] As is clear from the above description, the punching sound reduction device for a press machine of the present invention reduces material punching noise during press working into the punching waste passage hole in the frame of the press machine. By providing a resonance box through a small conduit with the required internal diameter and length, the problems of the prior art are effectively solved, without reducing productivity.
This has the effect of reducing punching noise.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a punching noise reduction device for a press machine that is an embodiment of the present invention, and FIG. 2 is a front view of a turret punch press in which the present invention is implemented. 1...Turret punch press body 5...Lower frame 15...Punching part 17
A... Lower turret 29... Punching sound reduction device 3
1... Lower base 33... Punching waste passage hole 35... Resonance box for reducing punching noise 37... Small conduit 39... Upper block 4
1...Lower Block Agent Patent Attorney Hidekazu Miyoshi Figure 2

Claims (1)

[Claims] A press characterized in that a resonance box is provided in a punching waste passing hole in a frame of a press machine, which reduces the sound of punching material generated during press working through a small conduit having a required inner diameter and length. Punching noise reduction device for processing machines.