JPH07323396A - Method for transmitting driving power to ram in crank press - Google Patents

Abstract

PURPOSE:To attain speeding-up in the reciprocal linear movement of a ram and improvement in productivity by transmitting the driving power of an actuator to the ram through a crank shaft and oscillating the crank shaft of a crank press, which imparts a reciprocal linear movement to the ram, left and right at only a prescribed angle centering the moving direction of the ram. CONSTITUTION:A crank shaft 18 is oscillated left and right at a prescribed angle theta centering the moving direction (center line A) of a ram 20. This oscillating operation of the crank shaft 18 is performed by measuring the angular displacement of the crank shaft 18 by a detector and driving a motor forward and backward in accordance with the measurement. That is to say, a signal is given from a computer to the motor at the point of time when a set oscillating angle coincides with the detected value of the detector. Incidentally, it is effectively controlled if the detection is possible by the detector on the information immediately before the ram 20 reaches a bottom dead point and if the motor speed is reduced at such time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of transmitting power to a ram in a crank press which enables high speed forming of a work piece.

[0002]

2. Description of the Related Art Press machines are roughly classified into mechanical presses using a mechanical mechanism and hydraulic presses using hydraulic pressure or pneumatic pressure, etc., depending on how the driving force is applied. The mechanical press, which is superior in

Mechanical presses include a system using a link mechanism such as a crank type, a knuckle type, a link type, and a system utilizing a cam and screw mechanism such as a friction screw type, a cam type, a screw type, and a rack type. Among them, the crank type crank press is most widely used.

The crank press is classified into a crank pin type, a full eccentric type, a semi eccentric type, and a pin eccentric type. The crank pin type is mainly used for deep drawing, which requires a relatively long stroke. Is used for coining and embossing, the semi-exene type is for general molding, and the pin-exene type is for punching.

In the crank press, the crank shaft is rotated by receiving power transmitted from an actuator such as a motor, and the ram is interlocked with the crank shaft to make a linear reciprocating motion in the vertical direction.

[0006]

However, according to the above-described conventional crank press, the ram can be reciprocated once such that the crankshaft makes one revolution, that is, from top dead center to bottom dead center to top dead center. Therefore, the number of strokes per minute was small and the high-speed molding ability was low.

Further, according to the above crank press, although a large stroke can be given to the ram by the rotation of the crankshaft, there is a drawback that the power consumption increases by that amount.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a crank press for transmitting the power of an actuator to a ram via a crank shaft to linearly reciprocate the ram. The above object is achieved by providing a method of transmitting power to a ram in a crank press, which is characterized by swinging a predetermined angle left and right around a moving direction.

[0009]

According to the present invention, when an actuator such as a motor or a cylinder is driven in forward / reverse directions and is expanded / contracted to swing the crankshaft left and right, the ram is interlocked with the swing of the crankshaft to reciprocate up and down. Make a linear motion.

Particularly, during one reciprocation of the crankshaft, the ram makes two reciprocations up and down, such as top dead center-bottom dead center-top dead center-bottom dead center-top dead center.

Therefore, molding can be carried out twice during one reciprocation of the crankshaft, and the molding efficiency is remarkably improved.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a schematic side view showing a crank press,
2 is an operation state diagram of a crankshaft in the same crank press, FIG. 3 is a schematic view of a main part showing a second embodiment of the present invention, and FIG.
FIG. 6 is a schematic view of a main part showing a third embodiment of the present invention.

In FIG. 1, 10 and 11 are motors and 12
Is a power transmission device, 14 is a flywheel, 18 is a crankshaft, 20 is a ram (slide), 23 is a detector, 24 is a computer, and 25 is a bed.

Motors 10 and 11 as actuators
Is an electric motor, and in particular, one of the motors 10 is a spindle motor or the like that can rotate in the forward and reverse directions.

The motor 10 is a power transmission device 1
2 is movably connected to a transmission gear (not shown) built in the motor 2 via a timing belt or the like, and the other motor 11 is movably connected to a flywheel 14 via a timing belt 13. ing.

The power transmission device 12 is, for example, a device disclosed in Japanese Patent Application No. 6-4861. Specifically, a flywheel 14 is rotatably provided on an input shaft 15, and the input shaft 15 is rotatably mounted on the input shaft 15. The power of the flywheel 14 is transmitted to a drum (not shown) arranged in parallel with respect to 15,
The drums rotate in opposite directions.

Further, coils (not shown) having different winding directions are provided on the outer circumferences of both drums, and one end of each coil is fixed to the speed change gear and the other end is fixed to the input shaft 15. It is fixed to a drive wheel (not shown) that meshes with the existing gear.

Therefore, when the motor 10 is driven in the forward and reverse directions, one coil is wound around the drum and the drive wheel is pulled at the other end to rotate, so that the input shaft 15 is rotated in the driving direction of the motor 10. It becomes.

Reference numeral 16 in the drawing denotes an output shaft, which is movably connected to the input shaft 15 so as to rotate forward and backward in accordance with the rotation of the motor 10.

On the other hand, a gear 17 is fixed to the output shaft 16, and a gear 19 is fixed to one end of the crankshaft 18.

As shown in the drawing, both gears 17, 19 are meshed with each other, and the crankshaft 18 and the ram 20 are connected via a connecting rod 21.

Thus, the power of the motors 10 and 11 as actuators is transmitted from the power transmission device 12 to the crankshaft 18 and to the ram 20 via the crankshaft 18, whereby the ram 20 is guided to the guide surface 22. It reciprocates linearly up and down along.

The crankshaft 18 may be of a full-excene type, a semi-excene type, or a pin-excene type, in addition to the crankpin type as shown.

By the way, as shown in FIG. 2, the crankshaft 18 is swung right and left about the moving direction of the ram 20 (center line A shown in the drawing) by a predetermined angle θ.

In this embodiment, the swinging operation of the crankshaft 18 is performed by driving the motor 10 in the forward and reverse directions. Specifically, the detector 23 shown in FIG. Is measured and the motor 10 is driven in the normal and reverse directions according to the measured value. In particular, the forward and reverse drives of the motor 10 are performed via a predetermined computer 24.

For example, when the predetermined angle θ is set to 60 degrees and the set value and the detection value by the detector 23 match,
A reverse rotation signal is issued from the computer 24 to the motor 10.

The detector 23 may be a rotary encoder or various proximity switches, but the contact of the motor 10 may be switched using a timer, and the crankshaft 18 may be swung by doing so.

On the other hand, it is effective to enable the detector 23 to detect the information immediately before the ram 20 reaches the bottom dead center and control the motor 10 to decelerate at this time, thereby alleviating noise and impact. be able to.

Next, FIGS. 3 and 4 show another embodiment of the present invention. In the embodiment shown in FIG. 3, a hydraulic motor M is used as the actuator.

As shown, the drive shaft m of the hydraulic motor M
Is directly connected to one end of the crankshaft 18, and the crankshaft 18 can be swung by driving the drive shaft m in the forward and reverse directions.

Specifically, the hydraulic motor M comprises a gear motor, a vane motor, a piston motor, etc., which is connected to the hydraulic pump P via a valve V.

By changing the flow of hydraulic oil by switching the valve V, the drive shaft m can be driven forward and backward.

The switching operation of the valve V may be performed by detecting the position state of the crankshaft 18 using the rotary encoder or various proximity switches as described above and receiving the signal.

Next, in the embodiment shown in FIG. 4, a hydraulic cylinder S is used as an actuator.

As shown in the figure, the rod R of the hydraulic cylinder S is fixed to an arm T extending from one end of the crankshaft 18, and the crankshaft 18 can be swung by expanding and contracting the rod R. I am doing it.

More specifically, this hydraulic cylinder S has a valve V
The rod R is expanded and contracted by being connected to the hydraulic pump P via a valve and changing the flow of hydraulic oil by switching operation of the valve V, and the ram 20 is at the top dead center when the rod R is at the longest and the shortest. It is located at.

The switching operation of the valve V is performed by detecting the position state of the crankshaft 18 using the rotary encoder or various proximity switches as described above and receiving the signal, or by limiting the position of the rod R. There is a method of detecting with a switch and receiving the signal.

[0038]

According to the present invention, in a crank press which transmits the power of an actuator to a ram via a crank shaft to linearly reciprocate the ram, the crank shaft of the crank press is moved in the moving direction of the ram. Since the ram can be reciprocated twice while the crankshaft is reciprocated once by swinging it by a predetermined angle about the center of the ram, the reciprocating linear motion of the ram can be speeded up, and eventually the workpiece It has an excellent effect that high-speed molding is possible and productivity is remarkably improved.

Further, since the amount of operation of the crankshaft is reduced, it is possible to reduce power consumption by that amount, and there is an excellent effect that the economical efficiency is improved.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a crank press.

FIG. 2 is an operation state diagram of a crankshaft in the same crank press.

FIG. 3 is a schematic view of a main part showing a second embodiment of the present invention.

FIG. 4 is a schematic view of a main part showing a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 motor 11 motor 12 power transmission device 13 timing belt 14 flywheel 15 input shaft 16 output shaft 17 gear 18 crankshaft 19 gear 20 ram 21 connecting rod 22 guide surface 23 detector 24 computer 25 bed V valve M hydraulic motor S hydraulic cylinder

[Procedure amendment]

[Submission date] June 7, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transmitting power to a ram in a crank press which enables low speed and high cycle forming of a work piece.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

However, according to the above-described conventional crank press, the ram can be reciprocated once such that the crankshaft makes one revolution, that is, from top dead center to bottom dead center to top dead center. Therefore, the number of strokes per minute was small and the high cycle molding ability was low.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction content]

[0038]

According to the present invention, in a crank press which transmits the power of an actuator to a ram via a crank shaft to linearly reciprocate the ram, the crank shaft of the crank press is moved in the moving direction of the ram. Since the ram can be reciprocated twice while making one reciprocation of the crankshaft by swinging the center of the work piece to the left and right by a predetermined angle, low speed and high cycle molding of the work piece is possible and productivity is improved. Has an excellent effect that it will be remarkably improved.

Claims (1)

[Claims] 1. In a crank press for transmitting the power of an actuator to a ram via a crank shaft to linearly reciprocate the ram, the crank shaft of the crank press is left and right centered around the moving direction of the ram. A method of transmitting power to a ram in a crank press, which is characterized by swinging at an angle.