JPH0324289B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an ejector device in a forging press.

(Prior art) In a hot closed forging press, when forging is performed in multiple steps in one press, an ejector is provided at each forging step, and the forged product after forging in each step is taken out by the ejector. , and are sequentially sent to subsequent process sections using a transfer device.

Conventional ejectors used in this type of forging press include mechanical types, hydraulic types, and the like.

For example, the one disclosed in Japanese Utility Model Application Publication No. 61-87632 is of a hydraulic type. This conventional type is provided with an ejector (knockout pin) for taking out the forged product in each of a plurality of process sections, and this ejector is fixedly provided on a common knockout bar. By reciprocating the knockout bar, a plurality of ejectors are operated at the same timing. and,
This knockout bar is configured to reciprocate using a pair of left and right hydraulic cylinders. The pair of hydraulic cylinders are connected via a branch pipe to one hydraulic pressure generating cylinder that operates in conjunction with the crankshaft.

(Problems to be Solved by the Invention) For mechanical ejectors, for example, incorporating a multi-stroke type, large capacity, and long stroke into a double-acting type forging press such as a hot closed forging press requires a complicated mechanism. , which is impossible due to space considerations.

Furthermore, in the hydraulic ejector disclosed in the above-mentioned Japanese Utility Model Application No. 61-87632, hydraulic pressure is supplied from one hydraulic pressure generating cylinder to a pair of knockout bar actuating cylinders via a branch pipe. If the load applied to each ejector (knockout pin) varies (in multi-process forging presses, the load usually differs for each process depending on the shape of the forged product and the shape of the die). There was a problem that the pair of left and right cylinders could not move in the same way, the knock-out bar was tilted, and the knock-out timing of each ejector was not aligned.

This has caused a problem in that it is difficult to automate the transportation of the forged product to the next process.

That is, since it is not possible to properly time the knockout, it is not possible to properly transport the forged product to the next process.

In order to solve this problem, it is possible to delay the timing of transport until the time when knockout is expected to be completely completed, but if the timing is delayed, the cycle time will become longer.
Productivity decreases. In the case of forging presses used in the manufacture of automobile parts, etc., automation of conveyance is an important issue to enable improved productivity.

In view of these conventional problems, it is an object of the present invention to prevent variations in the stroke operation timing of each ejector even if the load on the ejector of each process varies.

(Means for solving the problem) The present invention, as a means for solving the problem,
The following configuration was adopted. That is, the present invention is characterized in that, in an ejector device for a forging press, which is equipped with ejectors 2 for taking out forged products in each of a plurality of process sections, the plurality of ejectors 2 are moved independently of each other by hydraulic pressure. A hydraulic pressure generating cylinder 4 is provided corresponding to each ejector 2, and a pair of the corresponding ejector 2 and hydraulic pressure generating cylinder 14 are connected to each other by a conduit 24. In addition, the hydraulic pressure generating cylinder 14 has a piston rod 16 that reciprocates in synchronization with the ram motion of the press ram, and the piston rods 16 of each hydraulic pressure generating cylinder 14 are connected to each other in series.

(Function) According to the present invention, the piston rod reciprocates in synchronization with the ram motion of the press ram. Since the piston rods of each hydraulic pressure generating cylinder are connected in series, they perform the same movement. The hydraulic pressure generated by each hydraulic pressure generating cylinder is individually supplied to each ejector via a pipe line, and each ejector is operated independently. In this case, since the hydraulic pressure is increased independently according to the load of each ejector, the knockout timing can be accurately synchronized even if the load fluctuates.

(Example) Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. In Figs. As shown in FIG. 4, a hydraulic ejector 2 is provided in the process section. Reference numeral 3 denotes a frame of the forging press 1, and a crankshaft 4 for driving a press ram (not shown) is supported on the upper side of the frame 3 via bearings 5 and the like. 6 is a brake device, which is attached to the frame 3 via a brake holder 7, and is attached to the crankshaft 4 on the end side.
It is now possible to apply braking force to the

A cam 8 is fixed to the shaft end of the crankshaft 4 within the brake holder 7. Reference numeral 9 denotes a cam lever, which is pivotally mounted to a protruding portion 10 integral with the brake holder 7 with a pin 11 so as to be able to swing vertically.The cam lever 9 also has a cam roller 12 that contacts the cam 8 from above and is rotated by a pin 13. freely supported.

14 is a hydraulic pressure generating cylinder, and there are the same number of cylinders corresponding to each ejector 2 of the forging press 1. The hydraulic pressure generating cylinders 14 are arranged vertically in a row in a skewer shape and mounted on the frame 3. The pistons 15 of each hydraulic pressure generating cylinder 14 are connected to each other via a piston rod 16, and the piston rod 16 of the upper end hydraulic pressure generating cylinder 14 is connected to the joint 1.
7. Connected to the intermediate point of the cam lever 9 via a pull rod 18, a joint 19 and a pin 20. Each hydraulic pressure generating cylinder 14 has a piston 15.
A discharge port 22 is formed for discharging the liquid 21 in the upper chamber 21 to each ejector 2, and the lower chamber is opened to the atmosphere via an air inflow port 23.

FIG. 4 shows an operation system diagram, in which each ejector 2 is connected to the discharge port 22 of each hydraulic pressure generating cylinder 14 via a pipe line 24. A relief valve 25 and a solenoid valve 26 are connected to each pipe line 24 .
27 is a tank for storing liquid, 28 is a low pressure air source, and 29 is a high pressure air source. 30 is a motor, 3
1 is a pump driven by this, and 32 is a relief valve.

In addition, in FIG. 4, the high pressure air source 29 is used to return the piston of the ejector 2 to its initial position, but a separate accumulator may be used.
Even if it is returned to the tank of the pump unit through the
Needless to say, similar effects can be obtained.

Furthermore, it can be implemented not only when the ejector 2 is located on the ram side but also when it is located on the head side.

(Effects of the Invention) According to the present invention, each ejector in each process is provided with a hydraulic pressure generating cylinder that is synchronized with the ram motion, so even if there are load fluctuations, the timing of knockout can be accurately synchronized. This makes it possible to automate automatic transportation between each process. This also reduces cycle time and improves productivity.

Furthermore, since the piston rods of each cylinder are connected in series, the timing of knockout in each process can be accurately synchronized.

Further, since the piston rods of the hydraulic pressure generating cylinders are connected to each other, the cylinders can be arranged in a compact space. Particularly, since a forging press device has a vertically long overall shape due to its nature, it is effective to connect the piston rods in series to form a skewer-shaped cylinder that is compact and vertically long.

Furthermore, when hydraulic pressure generating cylinders are installed separately in parallel, a connecting rod is required to connect the piston rods to each other, but when connected in this way, the timing is affected by the tilting of the bar as in the conventional example described above. A misalignment occurs.

Further, when the knockout cylinder 2 has a large capacity, it is difficult to maintain the rigidity of the connecting rod, which poses a manufacturing problem, but the cylinder having the shape of the present invention is advantageous in terms of manufacturing.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a cutaway front view of the main parts, FIG. 2 is a sectional view of the same, and FIG.
The AA arrow view in the figure and FIG. 4 are operation system diagrams. 2... Ejector, 3... Press frame, 4
... Crankshaft, 8 ... Cam, 9 ... Cam lever, 14 ... Hydraulic pressure generating cylinder.

Claims (1)

[Scope of Claims] 1. An ejector device in a forging press that is equipped with ejectors 2 for taking out forged products from each of a plurality of process sections, wherein the plurality of ejectors 2 are provided to move independently of each other by hydraulic pressure. In addition, a hydraulic pressure generating cylinder 14 is provided corresponding to each ejector 2, and a pair of the corresponding ejector 2 and the hydraulic pressure generating cylinder 14 are connected to each other by a pipe line 24, and the liquid The ejector for a forging press is characterized in that the pressure generating cylinder 14 has a piston rod 16 that reciprocates in synchronization with the ram motion of the press ram, and the piston rods 16 of each hydraulic pressure generating cylinder 14 are connected to each other in series. Device.