JPH059796U - Low noise press - Google Patents

Abstract

(57) [Summary] [Purpose] The objective is to reduce noise, such as reducing the impact noise of the upper die of the punch press on the material and the fracture noise at the end of punching of the material. A cushion member having a load weight that is larger than the maximum load of an elastic member provided on the punch during operation is provided between the ram and the striker, and the lower end of the punch is the upper surface of the die.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a low noise press that reduces impact noise caused by hitting the upper die of a punch press against a material and punching sound (breaking noise) at the end of punching of the material.

[0002]

[Prior Art]

 As shown in FIGS. 5 and 6, since the eccentric shaft 19 is used for the press drive unit 7, the movement of the ram 9 draws a sine curve. Conventionally, in order to prevent scraps from rising after punching, the punch 13 is thrust several mm, about 2 mm to 4 mm, from the pass line PL which is the upper surface of the lower die (die) 15. Reference numeral 13a indicates a state in which the ram is thrust, and s indicates the thrust amount.

Therefore, since the pass line PL is located several mm above the bottom dead center DP of the ram 9, the upper die (punch) 13 cooperates with the die 15 to process (punching) the material W. The period of time a was instantaneous when the load applied to the frame was released in an extremely short time.

[0004]

[Problems to be solved by the device]

 By the way, since the machining speed in the pass line PL is high, there is a problem that the impact noise caused by the punch 13 hitting the material and the breaking sound when the material breaks (at the end of punching) are large and become noise.

An object of the present invention is to provide a low-noise press for reducing the noise at the time of punching by reducing the processing speed in the pass line in order to improve the above problems.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a striker at the lower end of a ram that moves up and down by the operation of a press drive unit, and the striker presses the upper end of the upper mold to cause the upper mold to move. A punch press for machining a material between a lower mold and a cooperating lower mold, which is mounted between the ram and the striker and has an elastic member mounted on the upper mold larger than a maximum load during operation. A low noise press comprising a cushioning member having a weight, wherein a lower end of the upper die is an upper surface of the lower die.

[0007]

[Action]

 By adopting the low noise press of the present invention, a cushion member having a load weight larger than the maximum load of the elastic member provided in the upper mold during operation is provided between the ram and the striker, and By using the lower end as the upper surface of the lower die, the impact noise of the ram hitting the punch and the processing speed on the pass line are slowed down, and noise is reduced by reducing the punching noise.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a punch press in which the present invention is implemented, and FIG. 2 is an enlarged view of a ram and a press drive unit of FIG. In FIGS. 1 and 2, a punch press frame 1 has a press drive unit 7 mounted on an upper frame 3, a ram 9 vertically moved by the press drive unit 7, and a striker 11 for applying a pressing force to a punch 13. Then, the die 15 is attached to the lower frame 5, and the punch 13 cooperates with the die 15 to punch the material W.

The press drive unit 7 is integrated with a rotary shaft 17 which is rotationally driven by a drive source (not shown), and one end of which is fitted to the end of the rotary shaft 17 by a key 21, a holding plate 23 and a fixing screw 25. The eccentric shaft 19 has an eccentric amount e, and a rotating arm 27 rotatably fitted to the outer periphery of the eccentric shaft 19.

The upper portion of the ram 9 is rotatably supported by the shaft 29 on the other end of the rotating arm 27, and is vertically movable by the bearing portion 31 provided on the side surface of the upper frame 3. . A cushion member, a disc spring 33 in this embodiment, is inserted between the striker 11 provided in the lower space of the ram 9 and the striker 11 is fixed to the ram 9 by the stripper bolt 35. A gap g is provided between the ram 9 and the striker 11, and a required mounting load is applied to the disc spring 33. This attachment load is set to be larger than the load (maximum load) when the stripper spring 37 provided between the punch 13 and the material retainer 39 is in operation.

Next, FIG. 3 shows an operation state diagram of FIG. When the striker 11 hits the punch 13 in the figure, the impact of the punching of the material W is reduced because the disc spring 33 is above the striker 11, and the lower end of the punch 13 is moved to the upper surface of the die 15 ( In order to set the pass line PL), the operation of the ram 9 shows a sine curve, and the punching time b is longer than the time a shown in FIG. 6, so that the punching speed during punching can be slowed. Therefore, the breaking sound (punching sound) of the material W 1 at the time of punching can be reduced.

Further, after the punching (processing) is completed, the punched material (cass) can be pushed into the die 15 by the restoring force of the disc spring 33 to prevent the scrap from floating.

At the end of processing, since the conventional processing speed was high, the load applied to the frame 1 was momentarily released, which caused a large noise. By adopting this, the load applied to the frame 1 is gradually released, so that the noise generated from the frame 1 can be reduced.

Further, the expansion of the disc spring 33 due to the release of the load suppresses the sudden rise of the punch 13, so that the negative pressure that may occur in the space (hole) of the die 15 is suppressed, and Lifting is prevented and debris can be reliably dropped.

The present invention should not be limited to the present embodiment, and can be implemented in other modes by making appropriate design changes, for example, the striker 11 and the ram 9. A urethane spring or the like can be used in addition to the disc spring 33 as the cushion member mounted between the two. It is even more effective when used in combination with a cam-driven press and a link press. Even when the cushion member of the present invention is used in a hydraulic press, it has the effect that the flexure of the frame can be gradually released.

[0017]

[Effect of the device]

 As is clear from the above description, the low-noise press of the present invention is provided with a cushion member having a load weight larger than the maximum load when the elastic member provided in the punch is operated, between the ram and the striker. By using the lower end of the die as the upper surface of the die, the problems of the conventional technology are effectively solved, and the impact noise of the ram hitting the punch and the processing speed in the pass line slow down and the noise of the fresing is reduced by reducing the punching noise. Is realized, and scraps are prevented from rising.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a punch press in which the present invention is implemented.

FIG. 2 is an enlarged view of a ram and a press driving unit of FIG.

3 is an operation state diagram of FIG. 1. FIG.

FIG. 4 is a punching operation curve diagram of FIG.

FIG. 5 is an explanatory view of a conventional punching processing state.

FIG. 6 is a punching operation curve diagram of FIG. 5; 1 Frame 7 Press Drive 9 Ram 11 Striker 13 Punch 15 Die 27 Rotating Arm 33 Disc Spring

Claims (1)

[Claims for utility model registration] [Claim 1] A striker is provided at the lower end of a ram that moves up and down by the operation of a press drive unit, and the striker presses the upper end of the upper mold to cause the upper mold to move. A punch press for processing a material between a lower die and a lower die cooperating therewith, the punch being larger than the maximum load during operation of an elastic member provided between the ram and the striker and provided in the upper die. A low noise press, comprising: a cushion member having a loading weight, wherein a lower end of the upper die is an upper surface of the lower die.