JPH115200A - Method and device for punching speed control of turret punch press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a means for reducing the punching noise by making the stroke volume/speed of a ram for die driving changeable, eliminating the clutch brake system required for the conventional means in a turret punch press. SOLUTION: A core 6 comprising a core roller 6a and a core slider 6b is installed at one end part of a ram driving shaft 3 which is connected to a flywheel 2 of a motor M driving for a die actuation. The core roller 6a is movable along the inside of a long hole 12 punched at the other end part of a link 11, which is rotatable around one supporting point 13 of the frame part of the mechanical press. The core slider 6b makes the roller 6a displacement driving in a vertical direction to the shaft line of the driving shaft 3 by an oil pressure. Then, the upper actuating end part of the ram 16 is connected to the bottom of the other end part of the link 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for controlling a work punching speed of a turret punch press.

[0002]

2. Description of the Related Art For example, a schematic diagram of an example of a conventional typical punching drive mechanism of a turret punch press for punching a sheet metal work between an upper turret and a lower turret by upper and lower dies (punch and die). Is shown in FIG.

In FIG. 3, 31/32 are upper / lower turrets each having a plurality of upper dies (punches) P / lower dies (dies) D, and W is a sheet metal clamped / held at a predetermined position. Work. The operation of the mold is driven by the operation of the ram 16.

The driving of the ram 16 is performed by lowering a striker 35 by rotation of a crankshaft 34. The crankshaft 34 is driven by a belt-driven flywheel 36 provided with a clutch / brake device (not shown) driven by an electric motor M. It is configured to be directly connected and driven to rotate.

In this type of conventional drive mechanism, it is necessary to drive the striker 35 up and down or to stop at the top dead center of the crankshaft 34 between the work punching and the work movement. I needed a clutch and brake device.

[0006]

Because of the driving mechanism described above, it is impossible to freely and variably control the speed of one rotation of the crankshaft 34, and the clutch / brake device attached to the flywheel is not possible. Requires a hydraulically operated wet clutch, for example, which requires a relatively high cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and eliminates the need for such an expensive clutch / brake mechanism and variably configures the operating speed / stroke amount of a ram. It is an object of the present invention to provide a means for reducing the punching noise by lowering the punching speed of a large workpiece and increasing it at a high speed after punching.

[0008]

Therefore, in the present invention, the object is achieved by providing an apparatus or a method described in any of the following items (1) to (3). .

(1) Between the ram for operating the mold of the turret punch press and the eccentric drive shaft, there is provided an eccentric amount control means capable of continuously changing the amount of drive eccentricity from zero to a predetermined value. A turret punch press punching speed control device.

(2) The stepless variable eccentric amount control means includes: a core roller provided at the tip of the eccentric drive shaft; and a steplessly moving the core roller in a direction perpendicular to the axis of the eccentric drive shaft. A core member comprising a hydraulically actuated core slider for displacement driving is provided, one end is connected to the drive upper end of the ram, and the other end is fixed to a part of the punch press machine frame. The turret punch press according to (1), wherein the core roller is rotatably fitted into an elongated hole formed in the one end of the link member that can pivot about the fulcrum. Speed control device.

(3) A turret punch press punching speed control method, wherein the turret punch press punching speed control device according to any one of (1) and (2) above is used to control the punching speed.

[0012]

According to the structure of the present invention as described above, an expensive clutch / brake mechanism is not required in the drive system of the crankshaft.
By moving the core and controlling the speed, the punching noise of the work can be reduced.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
This will be described in detail based on a suitable embodiment.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic perspective view of a main part of a driving mechanism for punching a die of a turret punch press according to the present invention, and a sectional view taken along the line AA of FIG. FIG. 2 is a sectional view taken along the line B, and FIG. 2 is an explanatory view of the ram speed / stroke variable mechanism in FIG.

(Structure) In FIGS. 1 and 2, M denotes a driving electric motor, which drives a flywheel 2 via a driving pulley and a V belt 1. The flywheel 2 does not require a clutch / brake device, unlike the flywheel 36 in the conventional example of FIG.

A drive shaft 3 is directly connected to the flywheel 2 in the horizontal left and right X directions, and a cylinder member 4 is fixed to the other end in a direction orthogonal to the drive axis line. The slider 6b of the core 6 having a freely rotatable core roller 6a at one end is disposed so as to be slidable in the front-rear Y direction by a piston 7 and a return spring (return spring) 8. This displacement drive is performed by driving the piston 7 from the hydraulic pressure supply port 9 at the end of the drive shaft 3 with hydraulic pressure passing through the oil passage 10 at the shaft center.

On the other hand, the core roller 6a is
Is rollably engaged in an elongated hole 12 drilled in
An end of the link member 11 is pivotally supported at a part of a fulcrum 13 of a machine frame portion of the punch press. 14 are connected via respective pins 15 to a mold driving ram 16 in the vertical Z direction.

(Operation) 1) As shown in FIG. 2, when the center position of the core roller 6a is at the center position A of the flywheel 2, the ram 16 remains at the top dead center even during the rotation of the flywheel 2. It has stopped and the up and down (Z direction) movement has stopped.

[0019] 2) In contrast, the cylinder by feeding a predetermined pressure oil to 4, the distance a core roller 6a through the core slider 6b by the piston 7 in the Y-direction position B in FIG. 2 l ₁ when the moved, the ram 16 is lowered by the stroke l ₂ by pivoting of the link 11, the ram 16 returns to the top dead center by returning to a position reversed.

3) As described above, the speed of the vertical stroke of the ram 16 can be controlled by adjusting the stroke of the core roller 6a by hydraulic pressure.

4) For this reason, the expensive clutch / brake device according to the prior art becomes unnecessary, and the noise in the working operation is controlled by controlling the light load operation process to be fast and to reduce the speed at the time of punching. Can be reduced.

(Other Embodiments) In the above embodiment, the hydraulic piston 7 is used to control the speed / stroke amount of the ram 16.
However, the principle of the present invention is not limited to this, and it is a matter of course that other variations of the stroke variable mechanism according to the present invention may be used. .

[0023]

As described above, according to the present invention,
The turret punch press does not require a relatively expensive clutch / brake mechanism to operate the turret punch press without the need for a relatively expensive clutch and brake mechanism. can do.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a main part of a punching drive mechanism according to an embodiment.

FIG. 2 is an explanatory view of a ram stroke / speed variable mechanism of FIG. 1;

FIG. 3 is a schematic view of an example of a conventional punching drive mechanism.

[Explanation of symbols]

 2 Flywheel 3, 34 Drive shaft 4 Cylinder 5 T-shaped groove 6 Core 6a Core roller 6b Core slider 7 Piston 8 Return spring (return spring) 9 Rotary joint 11 Link 12 Oval hole 13 Support point 14 Joint link 16 Ram 31 Upper turret 32 Lower turret 36 Flywheel (with clutch and brake device) D Die P Punch M Electric motor W Work

Claims (3)

[Claims] 1. An eccentric amount control means capable of continuously changing a drive eccentric amount between zero and a predetermined value is provided between a mold operating ram of a turret punch press and its eccentric drive shaft. A punching speed control device for a turret punch press. 2. The stepless variable eccentricity control means includes: a core roller provided at a tip end of the eccentric drive shaft; and a stepless displacement of the core roller in a direction perpendicular to the axis of the eccentric drive shaft. A core member comprising a hydraulically actuated core slider for driving was provided, and one end was connected to the drive upper end of the ram, and the other end was fixed to a part of the punch press machine frame. 2. The punching speed control of a turret punch press according to claim 1, wherein the core roller is rotatably fitted into an elongated hole formed in the one end of the link member pivotable about a fulcrum. apparatus. 3. A turret punch press punching speed control method, comprising: performing a punching speed control using the turret punch press punching speed control device according to claim 1.