JPS61255791A - Double action press - Google Patents

Abstract

PURPOSE:To obtains a double-action press having high utilization value at a low cost by providing side eccentric bodies to both sides of a pin of a crank shaft for driving an inner slide and connecting the eccentric bodies to an outer slide and driving mechanism for the same. CONSTITUTION:The crank shaft 17 is rotated to eject a cushion cylinder, rod 9 and piston 10 by an outer crank pin 12 so that an upper link 3 and a knuckle pin 4 are held stretched. Dies are brought into tight contact with each other above and below by means of the outer slide 8. The center of the knuckle pin 4 is held offset in this stage by the distance (e) from the line connecting the centers of the side eccentric bodies 2 and a gudgeon pin 7. The crank shaft 1 is then rotated and the inner slide 15 executes the pressurizing operation by a punch. The side eccentric bodies 2 on both sides make the same rotation as the rotation of the inner crank pin 16 and the outer slide 8 is forced to descend to generate the die clamping force.

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 a double-acting press is good for closed forging, the reality is that it is not practical due to the price.

In addition, since the inner slide and outer slide are linked, adjusting the mold installation time was troublesome.

(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) to provide a double-acting press that is highly useful for closed forging at a low cost.

(Solution Means of 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 the 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.

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. A gudgeon pin 7 connects the outer slide 8 and the lower link 6.

Reference numeral 13 denotes 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 gudgeon pin 14.

In Figure 2, 17 is the crankshaft for driving the outer slide, 1
2 is an outer crank pin, 11 is a mold clamping cushion cylinder, 10 is a piston, and 9 is a rod.

Referring to FIG. 3, the side eccentric body 2 is at the top dead center,
The knuckle pin 4 is pulled to the right by the piston 10 of the cylinder 11 and the rod 9 which are fastened to the crank pin 12 of the outer crankshaft 17. Note that the oil in the hydraulic chamber on the right side of the piston 10 is connected to the intensifier 18.
A constant pressure is applied by 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 10. Push out. Top link 3
Then, the knuckle pin 4 becomes extremely tensioned, and the outer slide 8 descends 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.
Apply the brakes to stop.

In this case, each part should be adjusted so that when the cylinder 11, piston 10, and rod 9 are pushed all the way as shown in FIG. The dimensions shall be determined.

Next, when the crankshaft 1 is rotated, the inner slide 15 is pressurized by the punch. At this time, the side eccentrics 2゜2 on both sides also rotate in the same way as the inner crank pin 16, so the outer slide 8
tries 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. This means that the drive system for the outer crankshaft 17 does not need to generate a 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 punch of the inner slide 15 is maintained while maintaining a constant mold clamping force. It will be molded.

When the side eccentric body 2 and the crank pin 16 have passed the bottom dead center and the work has been completed, the clutch of the outer crankshaft is engaged and rotated 180 degrees to return to the original position. In other words, the inner slide 15 and the outer slide 8 are placed at the original upper limit.
returns.

As shown in FIG. 5, the outer slide drive crankshaft 17 is provided with a motor 19, a flywheel, a clutch, and a brake system 20.
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: l Crankshaft 2 Side eccentric body 3 Upper link 4 Knuckle pin 5 Fork 6
Lower link 7 Gullion pin 8 Outer slide 9 Rod 10 Piston 11 Cushion cylinder 12 Outer crank pin 13 Inner connecting rod 14 Inner gudgeon pin 15 Inner slide 16 (for inner slide) Crank pin 17 (for outer slide drive) Crankshaft 18 Intensity Fire 19 Motor and flywheel 20 Clutch and brake system 21 Motor and flywheel 22 Clutch and brake system Applicant Sumitomo Heavy Industries, Ltd. Sub-agent Patent attorney Isamu Ohashi Figure 1 Figure 2 Figure 17 (? Utaslide ° M Boguri Wu) Crank Child 3rd Ward 2 Clark Jin) (A on top),) 4th Ward

Claims (1)

[Claims] A side eccentric body is provided on both sides of the crank pin of the crankshaft that drives the inner slide via the inner connecting rod, and the side eccentric body is connected to the outer slide via the upper link and the lower link, and the upper link and the lower link are connected to each other. A double acting press characterized by connecting an outer slide drive mechanism to a connecting pin.