JPH0343954B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Related Industrial Field) The present invention relates to a double-acting press which additionally has a mechanical drive mechanism for an outer slide in a closed forging device.

(Prior art) In a conventional double-action mechanical forging press, the inner slide is driven by a crank pin and a connecting rod, and the outer slide is driven by transmitting the movement of the connecting rod for the inner slide to a group of links. This makes the structure of the press extremely complicated, making it difficult to manufacture and assemble, and increasing costs. Therefore, even though it is known that double-acting presses are good for closed forging, the reality is that they are not affordable due to the cost.

Furthermore, since the inner slide and outer slide are interlocked, it is troublesome to make adjustments when installing the mold.

(Problems to be solved by the invention) 1. To obtain a mechanical double-acting press with a simple structure that can perform closed forging, 2. To simplify handling by allowing the inner slide and outer slide to be operated separately. , and 3. It is an object of the present invention to provide a double-acting press that is highly useful for closed forging at a low cost.

(Means for Solving the Invention) A side eccentric body is provided on both sides of a crank pin of a crankshaft that drives an inner slide via an inner connecting rod, and the side eccentric body is connected to an outer slide via an upper link and a lower link, The present invention is characterized in that an outer slide drive mechanism is connected to a pin that connects the upper link and the lower link, thereby providing an additional drive mechanism on the outer slide.

(Embodiment of the invention) An embodiment will be described with reference to the drawings. 1 is a crankshaft, and 2 is a side eccentric body having a very small amount of eccentricity X. 3 is an upper link connected to the side eccentric body 2. Numeral 4 is a knuckle pin by which the upper link 3 and the lower link 6 are pivotally connected. A fork 5 is connected to the upper link 3 via a knuckle pin 4. 7 is a gudgeon pin,
This connects the outer slide 8 and the lower link 6.

Reference numeral 13 designates an inner connecting rod, one end of which is connected to the crankshaft via an inner slide crank pin 16 having a large eccentricity Y. Reference numeral 15 denotes an inner slide, which is connected to the inner connecting rod 13 via an inner gauge pin 14.

In FIG. 2, 17 is a crankshaft for driving the outer slide, 12 is an outer crank pin, 11 is a mold clamping cylinder, 10 is a piston, and 9 is a rod.

In addition, the upper link and the lower link, and the side eccentric body,
It was pivoted with a knuckle pin in a dogleg shape offset from the straight line passing through the center of the gudgeon pin that connects the lower link and the outer slide.

Referring to FIG. 3, the side eccentric body 2 is at the top dead center, and the knuckle pin 4 is located at the outer crankshaft 1.
Cylinder 11 held on crank pin 12 of 7
is pulled to the right by the piston 10 and rod 9. Note that oil in the hydraulic chamber on the right side of the piston 10 is given a constant pressure by an intensifier 18. The outer slide 8 is at the upper limit, and at this time, the crank is at the top dead center, and both the inner slide crank pin 16 and the side eccentric body 2 are at the top dead center.

(Operation) Now, the press operates in the following order. In FIG. 4, when the clutch for the outer crank (not shown) is first engaged and the crankshaft 17 for driving the outer slide (FIG. 2) is rotated, the outer crank pin 12 is connected to the cushion cylinder 11, the rod 9, and the piston. Push out 10. The upper link 3 and the knuckle pin 4 are in a substantially tensioned state, and the outer slide 8 is lowered until the molds come into close contact with each other from top to bottom.
At this point, the outer slide drive crankshaft 17 is at its dead center, but the brake is applied to stop it.

In this case, the cylinder 11 and piston 1 are shown in FIG.
0. The dimensions of each part shall be determined so that the center of the knuckle pin 4 will be offset by e from the line connecting the center of the side eccentric body 2 and the gudgeon pin 7 when the rod 9 is just pushed completely.

Next, when the crankshaft 1 is rotated, the inner slide 15 is pressurized by the punch. At this time, the side eccentrics 2 on both sides,
Since the outer slide 8 also rotates in the same way as the inner crank pin 16, the outer slide 8 attempts to descend and generates mold clamping force.

Since the crank pin 12 is now at the dead center, a reaction force is applied to the outer crankshaft 17, but no rotational torque is applied to it. That is, the outer crankshaft 1
This means that the drive system of No. 7 does not need to generate large torque. In the outer slide 8, hydraulic pressure is always generated on the right side of the piston 10, and the maximum pressure is controlled by the intensifier 18, so that the inner slide 1 is maintained at a constant mold clamping force.
The punch No. 5 will perform the forming process.

When the side eccentric body 2 and the crank pin 16 pass through the dead center and the work is completed, engage the clutch of the outer crankshaft and rotate it 180 degrees to return it to its original position. That is, the inner slide 15 and the outer slide 8 return to their original upper limits.

As shown in FIG. 5, the outer slide drive crankshaft 17 is provided with a motor 19, a flywheel, and a clutch and brake system 20.
The outer crankshaft 17 is provided with another small capacity motor, a flywheel 21, and a clutch and brake system 22.

(Effects of the Invention) With the above configuration, a double-acting press that is highly useful for closed forging can be provided at a low cost, and the mechanism is simple and there are fewer troubles. In addition, since the outer slide can be operated independently of the inner slide, the mold of one slide can be replaced while the other slide is retracted, making it easier to install the mold.

[Brief explanation of drawings]

FIG. 1 shows a drive mechanism of a double-acting press according to the present invention. Figure 2 shows the drive mechanism using the crankshaft for driving the outer slide. 3 and 4 are explanatory diagrams of the operation of the upper link. FIG. 5 shows details of the crankshaft drive section for driving the outer slide. In the figure: 1...Crankshaft, 2...Side eccentric, 3...Upper link, 4...Knuckle pin, 5
...Fork, 6...Bottom link, 7...Gudgeon pin,
8... Outer slide, 9... Rod, 10... Piston, 11... Cushion cylinder, 12... Outer crank pin, 13... Inner connecting rod,
14...Inner gauge pin, 15...Inner slide, 16...(for inner slide) crank pin,
17...(For outer slide drive) Crankshaft, 1
8...Intensifier, 19...Motor and flywheel, 20...Clutch and brake system, 21
...Motor and flywheel, 22.Clutch and brake system.

Claims (1)

[Claims] 1. Side eccentrics 2 are provided on both sides of the crank pin 16 of the crankshaft 1 that drives the inner slide 15 via the inner connecting rod 13,
The side eccentric body 2 is connected to an outer slide 8 via an upper link 3 and a lower link 6, and an outer slide drive mechanism 17 is connected to a knuckle pin 4 that connects the upper link 3 and the lower link 6. Double acting press. 2. The upper link 3 and the lower link 6 are pivotally supported by a knuckle pin 4 in a dogleg shape offset from a straight line passing through the center of the gudgeon pin 7 that connects the side eccentric body 2, the lower link 6 and the outer slide 8. A double acting press according to claim 1.