JPH0248108Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bed knockout device for a cold-warm forging machine.

In conventional bed knockout devices, the knockout drive unit is mechanically coupled, making it impossible to freely adjust the knockout capability. Also, when knocking out a product, the knockout force varies depending on the lubrication condition between the die and the product being knocked out.
Conventional bed knock-out equipment has the problem of damaging the forging machine, mold, etc. when knocking out.

This invention was developed in consideration of the above-mentioned issues, and allows the knock-out capacity to be freely set during product molding, and also prevents damage to forging machines, molds, etc. in the event that a knock-out force exceeding the set capacity is generated. The object of the present invention is to provide a knock-out device for a cold-warm forging machine.

Embodiments of the present invention will be described below based on the drawings.

In the figure, 1 is the drive shaft of the forging machine, 2 is the cam fixed to the tip of this drive shaft 1, and 3 is the frame 4 of the forging machine.
A swinging lever 5 whose intermediate portion is pivotally supported is a roller pivotally supported at the tip of the swinging lever 3, and this roller 5 is opposed to the cam 2. The other end of the swing lever 3 is connected to a biasing cylinder 6 that urges the swing lever 3 to rotate in a direction in which the roller 5 comes into contact with the cam 2 . A yoke 7 is attached to the swing lever 3.
are connected to each other, and a rod 8 is connected to this yoke 7. The other end of the rod 8 is connected to a lever 10 provided on a swing shaft 9. And the above-mentioned swing shaft 9
A knockout lever 11 is fixed to the other end, and a roller 12 is pivotally supported at the tip of the knockout lever 11, and this roller 12 is in contact with the lower end of a knockout pin 13.

As the drive shaft 1 rotates, the knockout pin 13 is moved upward via the cam 2, roller 5, swing lever 3, yoke 7, rod 8, etc., and the product is knocked out.

The yoke 7 is provided with a cylinder 14,
The tip of the rod 8 is connected to a piston 15 that fits into the cylinder 14. The cylinder 14 is closed by a cover 16 through which the rod 8 passes, and the side of the rod closed by the cover 16 forms an oil chamber 17. The yoke 7 and the rod 8 in the above-mentioned knockout operation are connected to this oil chamber 17.
The oil chambers 17 and 17 are connected through oil, and when an overload acts on the knockout 13, the oil pressure in the oil chamber 17 is increased.

The oil chamber 17 is connected to an oil tank 19 via an overload protector valve 18. The overload protector valve 18 is driven by air pressure to suck oil from an oil tank 19, and is connected to an air pump 20 that supplies pressurized oil at a pressure corresponding to the air pressure to the oil chamber 17. A relief valve 21 that adjusts the circuit pressure between the chamber 19 and relieves the pressure when it exceeds a predetermined pressure, and a pressure spool 22 that backs up the relief valve 21.
and an air chamber 23 provided opposite to the back surface of the pressing spool 22. The air chamber 23 and the air pump 20 are connected to an air pressure source via a solenoid valve 24 and a pressure regulating valve 25 which are in ON and OFF positions.

In the above configuration, normally, a hydraulic pressure commensurate with the force of bed knockout at the time of bed knockout is generated in the oil chamber 17 of the yoke 7, and this is balanced with the hydraulic pressure in the overload protector valve 18. Then, for some reason, the bed knockout ability becomes abnormal, and when a large force acts on the bed knockout, the oil pressure in the oil chamber 17 of the cylinder 14 increases. When the balance with the oil pressure in the overload protector valve 18 is disrupted, the overload protector valve 18 is activated, and the oil in the oil chamber 17 is transferred to the overload protector valve 18.
The oil is drained into the oil tank 19 through the oil tank 19, thereby absorbing the abnormal force acting on the bed knockout and preventing abnormally large knockout force from acting on the forging machine, the knockout pin 13, the mold, etc. Ru.

Further, the pressure in the oil chamber 17 in the normal state is adjusted by adjusting the air pressure supplied to the overload protector valve 18 using the pressure regulating valve 25.

Since the present invention is as described above, when an overload acts on the knockout device, the overload protector valve 18 releases the overload and prevents the overload from acting on the knockout device. Damage to out pins, molds, etc. is prevented. Further, according to the present invention, the overload protector valve 18 can be operated with one air circuit, thereby simplifying the piping circuit. In addition, since the oil pressure setting of the oil chamber 17 can be adjusted by adjusting the one pressure regulating valve 25 installed in this one air circuit, the oil chamber 17 can be adjusted.
7. The pressure can be easily adjusted, and the knockout ability can be freely changed according to the product to be knocked out.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a sectional view, FIG. 2 is a front view, and FIG.
FIG. 4 is a sectional view taken along the line, and FIG. 4 is a sectional view showing the structure of the overload protector. 1 is a drive shaft, 2 is a cam, 3 is a swing lever, 7 is a yoke, 8 is a rod, 11 is a knockout lever, 14 is a cylinder, 15 is a piston, 17 is an oil chamber, 18 is an overload protector valve, 20
is an air pump, and 25 is a pressure regulating valve.

Claims (1)

[Scope of utility model registration request] In a knock-out device for a cold-warm forging machine, the rotation of the drive shaft 1 is connected to a knock-out lever 11 via a cam 2, a swing lever 3, a rod 8 connected to the swing lever 3 via a yoke, etc. Yoke 7 connecting lever 3 and rod 8
A cylinder 14 is provided in the cylinder 14, and a piston 15 connected to the tip of the rod 8 is fitted into the cylinder 14 to form an oil chamber 17, and the yoke 7 and the rod 8 are connected to the oil chamber in the cylinder 14 during the knockout operation. Connected via oil in 17, to this oil chamber 17,
Driven by air pressure, oil is sucked from the oil tank 19, and pressure oil is supplied to the oil chamber 1 at a pressure corresponding to the air pressure.
The air pump 20 supplied to the air pump 7 is connected to the discharge oil circuit of the overload protector valve 18 that regulates the discharge oil pressure from the air pump 20, and the overload protector valve 18 is connected to the circuit between the air pump 20 and the oil chamber 17. It is composed of a relief valve 21 that adjusts the pressure and relieves when it exceeds a predetermined pressure, a pressure spool 22 that backs up this relief valve 21, and an air chamber 23 provided opposite to the back of this pressure spool 22. A knockout device for a cold-warm forging machine, characterized in that an air chamber 23 of an overload protector valve 18 and an air supply path to the air pump 20 are connected to an air pressure source via a solenoid valve 24 and a pressure regulating valve 25.