JPS5834212B2 - Upper die device of rotary forging machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an upper die device for a rotary forging machine that manufactures parts by rolling compression processing.

The material cut to the appropriate size is held in a lower die, the lower die is raised to a predetermined processing position, and the upper die applies local pressure to the material by grinding motion, gradually deforming it into the desired shape. As a rotary forging machine for manufacturing parts,
There is a forging machine described in Publication No. 065.

As shown in FIG. 1, this forging machine has a radial bearing A and a thrust bearing B disposed between a bearing case 69 and a main shaft portion 58, which regulate the position of the main shaft portion 58 in the radial direction. , a locking shaft 59 is installed below the main shaft part 58 at a predetermined angle of inclination, and another radial bearing C and a thrust bearing are arranged between the main shaft part 58 and the locking shaft 59, so that the radial direction of the locking shaft 59 is It is configured to regulate the position in the direction.

However, in this upper type device, the radial positions of the main shaft portion 58 and the lower part of the locking shaft 59 are both regulated by the thrust bearings B and D, so the thrust bearings B and D absorb the radial force as well as the axial direction. receive,
Therefore, it is required to have sufficient strength, and an extremely large bearing is required, resulting in drawbacks such as an increase in the size of the upper die device.

In addition, the lower outer periphery of the main shaft portion 58 and the locking shaft 59
Since no guiding mechanism is provided on the outer periphery of the lower part, the main shaft portion 58 and the locking shaft 59 do not rotate in a predetermined trajectory, resulting in drawbacks such as inability to roll predetermined parts. ing.

The present invention aims to eliminate the above-mentioned drawbacks, and embodiments thereof will be described below with reference to the drawings.

In FIG. 2, reference numeral 1 denotes a rotary forging machine base, and a pair of columns 2, 2 are fixed upright on both sides of the machine at a constant interval.

A yoke 3 is fixed to the upper end of the column 2 by a tie rod 4, and a drive source 6 is attached to the yoke 3 via a bracket 5.

The rotation of the drive source 6 is transmitted via a belt mechanism 7 to a main shaft portion 8 located at the center of the yoke 3.

At the lower end of this main shaft portion 8 is a locking shaft 9 which will be described later.
A cooler mounting device 1 is attached to the lower end of the locking shaft 9 so as to rotate around the axis of the main shaft 8.
0 and a bolster 11 are attached.

The bolster 11 holds an upper mold 12 having a conical projecting end, and is arranged so that the apex of the upper mold 12 coincides with the axis of the main shaft portion 8. It is configured to perform a grinding motion.

On the other hand, a two-stage stroke cylinder 13 is attached to the machine base 1, and this two-stage stroke cylinder 13 has a first cylinder system and a second cylinder system.

A slider 14 is attached to the first cylinder system of this two-stage stroke cylinder 13.
It is configured to move up and down along a lift guide 15 attached to the.

Further, a lower die 17 is attached to the slider 14 via a lower bolster 16.

A knockout pin (not shown) is arranged in the lower mold 17, and the second cylinder system is connected to this, so that the knockout pin can move up and down within the lower mold 17.

Next, main parts of the present invention will be explained.

In Fig. 3, bearing case 1 attached to yoke 3
The main shaft portion 8 is rotatably held in the main shaft portion 9 via a first radial bearing 20 at the upper portion, a first thrust bearing 21 at the middle portion, and a second radial bearing 22 at the lower portion.

The outer shape of the main shaft portion 8 is axially symmetrical, and the rotation center of the main shaft portion 8 is configured not to move at all during rotation.

A contraction hole 23 into which the locking shaft 9 is inserted is bored in the lower part of the main shaft part 8, and this storage hole 23 has a third radial bearing 24 in the upper part and a second thrust bearing 2 in the middle.
5. At the bottom, the locking shaft 9 is guided through a fourth radial bearing 26 so as to move along a predetermined trajectory.

In the rotary forging machine described above, rotation is transmitted from the drive source 6, and the main shaft portion 8 rotates with respect to the bearing case 19.

Accordingly, the radial position of the main shaft portion 8 is regulated by the first radial bearing 20 and the second radial bearing 22, and the axial position is regulated by the first thrust bearing 21, and the main shaft portion 8 is regulated with respect to the machine axis. Rotate.

Further, as the main shaft portion 8 rotates, the locking shaft 9 swings about the machine axis.

At this time, the radial position of the rocking shaft 9 is regulated by the third radial support 24 and the fourth radial bearing 26, and the axial position is regulated by the second thrust bearing 25, so that the locking shaft 9 deviates from the predetermined orbit. It oscillates accurately without any friction.

Furthermore, the locking shaft 9 swings within the storage hole 23.
In this case, the swing at the upper end is the largest and has the greatest effect on the rotation of the main shaft section 8 about the machine axis.
Since the movement of the outer periphery of the main shaft portion 8 is restricted by the second radial bearing 22, the main shaft portion 8 performs a predetermined rotation about the machine axis.

As explained above, the present invention is configured so that the radial position of the main shaft portion and the locking shaft is regulated by the upper and lower parts thereof, so that the main shaft and the locking shaft rotate at a predetermined position and follow a predetermined trajectory. It has the advantage of being able to swing and give a predetermined movement to the upper mold.

Further, since the outer shape of the main shaft part is axially symmetrical and the outer periphery of the main shaft part, which receives the violently swinging part of the rocking shaft, is also regulated, there is an advantage that the main shaft part does not swing at all during rotation.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a conventional rotary forging machine, FIG. 2 is a schematic diagram of the present invention, and FIG. 3 is an enlarged sectional view of a main part of the present invention. 1...Machine, 2...Column, 3...
...Yoke, 4...Tie rod, 5...
... Bracket, 6... Drive source, 7...
・Belt mechanism, 8,58... Main shaft part, 9゜59
...Rocking shaft, 10 ... Cooler mounting device, 11 ... Bolster, 12 ...
... Upper mold, 13 ... Two-stage stroke cylinder, 14 ... Slider, 15 ... Lifting guide, 16 ... Lower bolster, 17.・・・・・・
・Lower mold, 19, 69...Bearing case, 20...
...First radial bearing, 21... First thrust bearing, 22... Second radial bearing, 23.
...Storage hole, 24...Third radial bearing, 25...Second thrust bearing, 26...
・Fourth radial bearing, A, C... Radial bearing, B, D... Thrust bearing.

Claims (1)

[Claims] 1. Receives rotation from the drive source 6 via the bolster 11,
It has an upper mold 12 that performs a grinding motion and a lower mold 17 arranged correspondingly to the upper mold 12.
In a rotary forging machine that manufactures parts by raising and lowering a lower die 17 with respect to an upper die 12 as a slider 14 goes up and down with a cylinder, the bolster 11 is installed so as to swing together with the locking shaft 9. , the locking shaft 9 is inserted into the storage hole 23 of the main shaft portion 8 which rotates in response to rotation from the drive source 6;
Radial bearings 2 at the top and bottom of the locking shaft 9, respectively.
4.26 is arranged to guide the rocking shaft 9, while the outer shape of the main shaft part 8 is formed axially symmetrically, and radial bearings 20, 22 are arranged at the upper and lower parts of the main shaft part 8, respectively. 8. The upper die device is characterized in that a radial bearing 22 arranged at the lower part of the main shaft part 8 is arranged around a radial bearing 24 arranged at the upper part of the locking shaft 9.