JPS624365Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lower knockout device for a forging press.

Conventionally, the knockout pin was lifted using a lever that had a cam and a cam follower that came into contact with the cam, but in large top-drive machines, the cam was placed in the crown, which required a lot of time and labor for adjustment work. It required

Furthermore, it was necessary to disconnect the connecting portion each time the knock-out drive was stopped.

The present invention aims to provide a lower knockout device for a forging press that eliminates this drawback.

The present invention will be explained based on the drawings of one embodiment.

A piston 2 is provided on the rotating shaft 1 of the press, a cylinder 3 that accommodates the piston 2 is provided movably and rotatably in the axial direction of the rotating shaft 1, an eccentric shaft 4 is provided on the cylinder 3, and the cylinder 3 is provided on the rotating shaft 1 side. Serration 3 that meshes with serration 1a provided in
a, a rod 5 which is swingably adapted to the eccentric shaft 4, and a pin 17, a link 6,
The knockout pin 9 is raised and lowered through pins 18, 19, links 7, 20, 8, 21, 22, and rings 23.

A gear 10 is fixed to the tip of the eccentric shaft 4, and a pinion 1 for timing adjustment meshes with the gear 10.
Bearing 13 with 1 installed in the machine frame 12 of the press
It is rotatably supported on a shaft.

Pressure oil is supplied to the oil chamber A from the rotary joint 14 through the oil hole 4a provided at the center of the eccentric shaft 4, and to the oil chamber B, the oil is supplied through the oil hole 1b provided at the center of the rotating shaft 1. Pressure oil is supplied through an oil hole 2a provided in the piston 2 that communicates with the hole 1b.

Next, the operation of the present invention will be explained.

When the rotating shaft 1 of the press rotates, the rod 5 moves up and down depending on the eccentricity between the center of the rotating shaft 1 and the eccentric shaft 4, causing the link 6 to swing, the link 7 to move up and down, and the link 8 to move up and down.
The thrusting pin 9 is moved through the ring 23 by the swinging movement of the
is raised and lowered by a stroke S, whereby the knockout pin 16 of the mold is raised and lowered, and the pressed product is knocked out.

If you want to change the timing of the rise and fall of the knockout pin 16, supply pressure oil to the rotary joint 14 and send the pressure oil through the oil hole 4a provided at the center of the eccentric shaft 4. Although the piston 2 does not move, the cylinder 3 with the serrations 3a moves to the left in the figure and is disengaged from the serrations 1a provided on the rotating shaft 1. Therefore, the timing adjustment pinion 11 is rotated to match the desired knock-out timing by rotating the gear 10, eccentric shaft 4, and cylinder 3 to change the phase, and then returning the pressure oil to the original position, When pressure oil is supplied to the oil chamber B through 1a, the cylinder 3 moves to the right in the figure, and the serration 3a changes to the serration 1a.
The work of adjusting the timing of engagement and knockout is completed.

The relationship between the change in knockout timing and the rotation angle of the serration 3a, and the thrust pin 9
The relationship between the slide stroke, knockout amount, and crank angle when the length of is shortened is as shown in FIG.

According to the present invention having the above-described configuration and operation,
Since this invention uses an eccentric boss mechanism, it requires fewer parts than conventional mechanisms using cams and cam followers, and the design layout is easy, reducing setup time related to timing adjustment. do. Further, a device for preventing the cam follower from flying off is not required. Furthermore, if it is desired to work with the knock-out operation stopped, it is only necessary to supply pressure oil to the disengaged side of the serrations, and there is no need to remove the connecting parts as in the past.

[Brief explanation of the drawing]

Fig. 1 is a diagram for explaining one embodiment of the present invention, Fig. 2 is a diagram for explaining the operation transmission relationship from the rod 5 to the uplift pin 9, Fig. 3 is a sectional view taken along line C-C in Fig. 2, and Fig. The figure is a graph for explaining knockout timing adjustment. 1 is the rotation axis, 2 is the piston, 3 is the cylinder, 4
is an eccentric shaft, 5 is a rod, 6 is a link, 7 is a link, 8 is a link, 9 is a projecting pin, 10 is a gear, 1
1 is the pinion, 12 is the machine frame, 13 is the bearing,
14 is a rotary joint, 15 is a bolster,
16 is a pin, 17 is a pin, 18 is a pin, 19 is a pin, 20 is a pin, 21 is a pin, 22 is a pin, 23
is a ring.

Claims (1)

[Scope of utility model registration request] A piston is provided on the rotating shaft of the press, a cylinder that accommodates the piston is provided so as to be movable and rotatable in the axial direction of the rotating shaft, and the cylinder is provided with an eccentric shaft and engages with a serration provided on the rotating shaft side. A lower knockout device for a forging press, characterized in that it has a structure in which a knockout pin is raised and lowered via a rod that is swingably fitted to the eccentric shaft and a link that is connected to the rod. .