JPS6048250B2 - forging press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a forging press having a lifting mechanism, and more particularly to a forging press having a mechanism for lifting a forged material onto a movable crosshead.

Conventionally, a known method of suspending a forged material on a movable crosshead during the upward stroke of the movable crosshead is to suspend the forged material using a steel chain or wire that is simply suspended from the movable crosshead. Is there a way to raise it?

This method has the disadvantage that it takes time to attach and detach the chain or wire to the material to be forged, and the material to be forged cannot be rotated or transferred.

In addition, for upsetting forging work that requires standing on a pedestal, we use cranes and other loading machines.
It is necessary to lift it out of the forging press and perform other work such as tipping it over. For this reason, the work of transporting the heavy, high-temperature to-be-forged material and attaching it to and removing it from the pedestal is complicated and has the drawback of being a waste of heat and time. An object of the present invention is to transport the above-mentioned forged material to a forging press without the complicated rotational movement of other load-throwing machines such as cranes by effectively utilizing a lifting mechanism attached to a movable crosshead. , to provide a forging press with good workability.

The present invention focuses on the driving force for lifting the movable crosshead of a forging press, and equips the movable crosshead with a large driving force with a special mechanism for lifting the material to be forged. This makes it possible to lift and rotate forged materials.

In one embodiment of the present invention, a movable crosshead of a forging press and an arm load fulcrum of a gripping device are supported by the movable crosshead, and the movable fulcrum of the arm is on a center line in a direction in which the forged material is supplied to the forging press. A cylinder is fixed to the movable crosshead of the piston, and this cylinder is connected to a piston rod.

The cylinder mechanism includes a night shift working piston with a piston movable relative to the cylinder and arranged to move the arm and a tongue attached to the other end of the arm. An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a forging press equipped with the present invention. The arm 1 is supported by a load fulcrum 11 of the arm 1 on a movable crosshead 5, and the movable fulcrum 9 of the arm 1 is supported by a piston rod connected to a piston 3 in a cylinder 4 fixed to the movable crosshead 5. By supplying pressure oil to or discharging pressure oil from the space of the cylinder 4, the piston 3 and the piston rod 2 are moved, and the movable fulcrum 9 of the arm connected thereto is raised and lowered. By this lifting and lowering movement, the arm 1 performs an arcuate movement about the load fulcrum 11 to open and close the tongs 10. Note that 6 is a fixed crosshead, 7 is a column,
8 indicates a lifting rod. Figure 2 shows an example of the hydraulic circuit in the arm opening/closing mechanism.
The same parts as in the figure are indicated by the same reference numerals.

Cylinder space 1 with pistons 3 on both ends of cylinder 4
2 and 13 have independent hydraulic lines and are always filled with oil. The hydraulic line to this cylinder is connected via a solenoid valve 14 to either a pressure source or a drain;
The piston 3 is operated by switching the solenoid valve 14.
Also, one of the hydraulic lines is equipped with an accumulator 15 for maintaining the arm 1 at the maximum opening without supplying pressure oil and a control valve 17 for controlling this, and the other hydraulic line is equipped with an accumulator 15 for maintaining the arm 1 at the maximum opening degree without supplying pressure oil, and the other hydraulic line is equipped with an accumulator 15 for maintaining the arm 1 at the maximum opening degree without supplying pressure oil. The accumulator 16 is provided with an accumulator 16 for guaranteeing and maintaining the opening degree of the arm 1, and a control valve 17 for controlling the accumulator 16. A safety valve 18 is also connected to ensure the pressure in the hydraulic line. According to one embodiment of the present invention described above, the material to be forged can be lifted and rotated by the movable crosshead, so loading machines such as cranes are freed from forging work, and thermal and time savings can be achieved. Furthermore, the forging press operator can remotely control the gripping of the material to be forged, which is effective in saving labor in the forging press operation.

The above is an explanation of one embodiment of the present invention, and in this example, the case where the gripping device of the present invention is applied inside the movable crosshead has been described, but it can also be used even if the gripping device of the present invention is attached to the outside of the movable crosshead. According to another embodiment of the present invention, the movable crosshead is provided with a sprocket wheel and the chain or wire is freely rotatable, so that the maximum load of the existing forging manipulator can be reduced by interlocking with, for example, an existing forging manipulator. It is possible to forge extremely heavy objects.

The feature of this mechanism is that when the movable crosshead lifts and rotates, the chain or wire is tensioned and can rotate freely, but after the movable crosshead descends and the material to be forged comes into contact with the lower anvil, the chain or wire is that it relaxes naturally and can be forged freely.

Therefore, the forging process can conveniently proceed by repeating [lifting-rotation-lowering-forging]. This process is shown in Figures 3 and 4.
To explain with a diagram, in FIG. 3, the movable cross head 5
The material to be forged 21 is positioned between the upper anvil 22 and the lower anvil 23, and is suspended by a chain or wire 27 via a sprocket 26 attached to the movable crosshead 5, and is rotated or horizontally moved. This is where the forging process was carried out. The horizontally movable forging manipulator 24 controls the horizontal movement of the forged material 21, and the forging manipulator 24 or the chain or wire 27 is arranged so that the rotational movement and lifting action of the forged material 21 can be controlled by either the forging manipulator 24 or the chain or wire 27. There is. If desired, a control system can be provided to synchronize the forging manipulator 24 and the chain or wire. In FIG. 4, the movable crosshead 5 is lowered, the material to be forged 21 contacts the lower anvil 23, and the chain or wire 27 is relaxed and being forged.

According to the present invention, the material to be forged can be reliably manipulated within the fixed position of the forging press, providing good workability and improving productivity.

[Brief explanation of the drawing]

FIG. 1 is a front view a of a forged brace according to an embodiment of the present invention.
and side view b) FIG. 2 shows a hydraulic circuit diagram of the gripping device shown in FIG. 3 and 4 are schematic diagrams schematically showing the movement of the forged material within the forging press. 1 ... Arm, 2
...Piston rod, 3 ...Piston, 4 ...Cylinder, 5 ...Movable crosshead, 6 ...Fixed crosshead, 7
...Column, 8...Lifting rod, 12, 13...Cylinder, 14...
...Solenoid valve, 15,16...Accumulator,
17... Control valve, 18... Safety valve.

Claims (1)

[Scope of Claims] 1. A forging press having a movable crosshead equipped with a mechanism for lifting the material to be forged, characterized in that a means for rotating the material to be forged is added to the lifting mechanism. 2. A forging press according to claim 1, which has an arm for gripping the to-be-forged material, and a cylinder mechanism consisting of a piston and a cylinder that opens, closes and rotates the arm. 3. The forging press according to claim 1, wherein the lifting mechanism has a turning chain in a movable crosshead.