JPS61255792A - Mechanical-hydraulic closed forging press - Google Patents

Abstract

PURPOSE:To obtain a double-action press having high utilization value for closed forging at a low cost by providing a pin for an inner slide to the center of a crank shaft and providing side eccentric bodies to both sides thereof to generate the die clamping force of an outer slide. CONSTITUTION:An oil pressure is generated on the right side of a piston 10 to eject a rod 9 and the piston 10 so that an upper link 3 and a lower link 6 are held stretched, thereby lowering the slide 8. The center of a knuckle pin 4 is held offset in this stage by the distance (e) from the straight line connecting the centers of the side eccentric bodies 2 and a gudgeon pin 7. The inner slide 15 makes the pressurizing operation by a punch when the crank shaft 1 is rotated. The side eccentric bodies 2 on both sides make the same rotation as the rotations of an inner crank pin 16 and the outer slide 8 is forced to descend to generate the die clamping force. The oil pressure is generated always on the left side of the piston 10 and therefore the outer slide 8 maintains the specified die clamping force. The punch of the inner slide 15 executes the molding work during this time.

Description

[Detailed description of the invention] (Related industrial fields) This invention relates to improvements in double-acting presses for forging.

(Prior Art) 1) 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. In this case, the structure of the press becomes extremely complicated, making manufacturing and assembly difficult and high in cost. Therefore, even though double-acting presses are known to be good for closed forging, the reality is that they are not practical due to the cost.

(Problems to be solved by the invention) Solving the problems of the prior art, ■ Making the mechanical double-acting press capable of closed forging a mechanical hydraulic type with a simple structure, ■ Separating the inner slide and outer slide. It should be operable and easy to handle, and ■D! To provide a double-acting press with high utility value for J-block forging at a low cost.

(Solution Means of the Invention) A link mechanism in which the upper link and the lower link are configured in a dogleg shape is used instead of the conventional connecting rod, and the intermediate pivot portion is moved by a hydraulic cylinder to lower the outer slide and connect the crankshaft. The mold clamping force for the outer slide is generated by side eccentric bodies provided on both sides of the crankshaft, and a crank pin for the inner slide is provided in the center of the crankshaft, and the inner slide is connected to the inner slide by an inner connecting rod pivotally supported by the crank pin. I made it drive.

(Example) An example will be described with reference to the drawings. 2 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.

Referring to FIG. 2, the side eccentric body 2 is at the top dead center,
The knuckle pin 4 is pulled to the right by the piston 10 and rod 9 of the cylinder knit 1 which are fastened to the crank pin 12 of the outer crankshaft 17. That is, 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. First, as shown in FIG. 3, hydraulic pressure is generated on the right side of the piston 10, and the rod 9. Push out the piston 10. Then upper link 3 and lower link 6
becomes almost flat, and the slide 8 descends a large distance.

In this case, the piston 1 in the cylinder 11 in FIG.
The dimensions of each part are determined so that when the rod 9 and the rod 9 are fully extended, the center of the knuckle pin 4 is offset by e from the straight line connecting the centers of the side eccentric body 2 and the gudgeon pin 7.

Now turn the crank. This rotation causes the inner slide 15 to perform pressurizing work using a punch. At this time, since the side eccentrics 2 on both sides also rotate in the same way as the inner crank pin 16, the outer slide 8 attempts to descend and generates mold clamping force.

Since the pin 12 is a pin fixed to the frame, the outer slide 8 always generates hydraulic pressure on the right side of the piston 10, and assuming that the maximum pressure is controlled by a relief valve, the outer slide 8 has a certain type. During this time, the punch of the inner slide 15 performs the forming process while maintaining the tightening force.

When the side eccentric body 2 and the inner crank pin 16 pass the bottom dead center and the work is completed, hydraulic pressure is generated on the opposite side of the cylinder 11 to pull the rod 9 and the piston 10. That is, the inner slide 15 and the outer slide 8 are returned to their original upper limits.

(Effects of the invention) Instead of the conventional connecting rod, the outer slide is lowered by moving the upper and lower links with a hydraulic cylinder, and side eccentrics are provided on both sides of the crankshaft to reduce the clamping force of the outer slide. Let it occur,
Since the crank pin for the inner slide is provided in the center of the crankshaft, it is possible to provide a double-acting press with high utility value for closed forging at a low cost. ■The mechanism is simple and there are few troubles. ■The outer slide can be operated independently from the inner slide. That is, mold mounting has advantages such as ease of work.

[Brief explanation of drawings]

FIG. 1 shows a drive mechanism of a double-acting press according to the present invention. FIGS. 2 and 3 are explanatory diagrams of the operation of the upper link and the lower link. In the figure: 1 Crankshaft 2 Side eccentric 3 Upper link 4 Knuckle pin 5 Fork 6
Lower link 7 Gaugeon pin 8 Outer slide 9 Rod 10 Piston 11 Cylinder
12 Pin 13 Inner connecting rod 14 Inner gudgeon pin 15 Inner slide 16 (for inner slide) Crank pin and above Applicant Sumitomo Heavy Industries, Ltd. Sub-agent Patent attorney Yudai Ohashi 1 Figure 15 I) Bush slide

Claims (1)

[Claims] The upper link (3) is connected to the side eccentric body (2) of the crankshaft (1) at the upper part, and the lower link (6) is connected to the outer slide (8) by a gudgeon pin (7) at the lower part.
) is pivoted in a dogleg shape offset from a straight line passing through the centers of the side eccentric body (2) and the gudgeon pin (7) with a knuckle pin (4), and the knuckle pin (4) is mounted in a separately provided cylinder (11). The outer slide is lowered by moving it with the piston (10), and the inner connecting rod (13) for driving the inner slide is connected to the crank pin (16) provided in the center of the crankshaft.
Mechanical-hydraulic closed forging press characterized by being equipped with.