JPS598807Y2 - Drive device for tubular product extrusion press - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drive device for a tubular product extrusion press, and in particular, it greatly improves the piercing power for making holes in solid billets, and also reduces the maintenance of the piercing power generating device. The main purpose is to make it simple.

In a tubular product extrusion press, if the length of the solid billet is increased, a large amount of piercing force is required to make holes in the billet.

In particular, indirect extrusion presses have the advantage of being able to use long billets because there is no friction between the container and the billet, but piercing with a mandrel requires an increase in the amount of piercing force.

The details of conventional discharge presses will be described later, but generally speaking, the piercing force generation device is built into the main ram of the extrusion force generation device, so there is a limit to the amount of piercing force, and maintenance is also difficult. It was.

By installing a piercing force generating device in front of the pushing force generating device, the present invention enables the design and installation of the piercing force generating device to be freely controlled without being restricted by the pushing force generating device, thereby strengthening the piercing force generating device. This guarantees ease of maintenance.Hereinafter, an embodiment of the present invention applied to an indirect extrusion press will be described in detail with reference to the drawings.

Although the driving device of the present invention is best applied to an indirect extrusion press, it can also be applied to a direct extrusion press.

Figure 1 shows the initial position, and Figure 2 shows the state during extrusion. In both figures, 1 indicates the main cylinder frame, and the front (front means the press direction, and rear means the opposite). A press frame body having a so-called rigid frame structure is constructed by firmly connecting the frame 1 and the press platen (not shown) disposed opposite to each other by columns 2 disposed diagonally.

An extrusion force generating device 3 is provided at the press center of the main cylinder frame 1, and an elongated cylindrical die stem 4 is attached and fixed at the press center of a press platen (not shown). Die 6 is attached.

The extrusion force generating device 3 is composed of a main cylinder 7 that is connected to and projects from the rear of the main cylinder frame 1, and a main ram 8 that is oil-tightly fitted to the main cylinder 7. The main ram 8 has a bottom as shown in the figure. A hollow structure is desirable from the viewpoint of weight reduction, but a solid structure is also possible.

A crosshead 9 is connected to the front end surface of the main ram 8,
In the embodiment, the main ram 8 and crosshead 9 are made separately,
Both are removably connected via a coupling means.

A side cylinder device 10 is provided on the side of the crosshead 9, and the device 10 consists of a side cylinder 11 fixed to the main cylinder frame 1 and a piston 12 fitted therein and connected to the crosshead 9. The head 9 and main ram 8 are moved forward and backward without load.

The cross head 9 protrudes forward from the main cylinder frame 1, and a piercing force generating device 1 is installed inside this head 9.
3 is built-in.

The generator 13 consists of a piercing cylinder 15 partitioned into the base of the crosshead 9 having front and rear hydraulic ports 14A, 14B, and a piercing piston 16 fitted in the cylinder 15 in an oil-tight manner. has been done.

A mandrel 18 is connected to the front of the piercing force generating device 13, that is, above the center of the press, via a holder 17 with a threaded joint 19, etc., and the holder 17 is connected to the piston 16.

The outer circumferential surface of the threaded joint portion 19 serves as a so-called guide portion, and is inserted into a pressurizing stem 20 that projects forward of the crosshead 9.

Further, behind the piston 16, a main ram 8 is mounted on the center of the press.
, a tail rod 21 extends through the cylinder 7,
A retaining block 2 is attached to the rear end threaded portion 21A of the rod 21.
2 is screwed on so that it can be screwed forward and backward.

In this embodiment, a stopper device 24 for restricting the forward movement of the mandrel 18 during extrusion is constructed by the engagement block 22 and a pair of front and rear pivot arms 23A, 23B that can be freely engaged and disengaged with the engagement block 22.

That is, a pair of front and rear plates 26 is fixed to the rear of the main cylinder 7 via a tie rod 25, and a pivot shaft 27 mounted on the plate 26 is provided with pivot arms 23A, 23B.

Note that this mandrel stopper device 24 is an example,
It is also possible to configure it as a side stopper device, which will be described later.

In addition, in Figures 1 and 2, 28 is a container;
9 is a container moving device, 30 is a solid billet, and 31 is a dummy block.

Next, to explain its operation, the solid billet 30 is housed in the container 28 and the dummy block 31 is attached, and the main ram 8 and the pressurizing stem 20 are moved by the extension operation of the side cylinder device 10. After moving forward with no load and undergoing an absetting process, pressure oil is sent to the extrusion force generating device 3 and the side cylinder device 10, and the billet 3 is placed in the container 28.
The container 28 and the billet 30 are integrated by friction.

Thereafter, the piercing process begins, but in consideration of the billet becoming longer due to piercing, the pressurizing stem 20 is slightly retracted, and the hydraulic port of the piercing force generating device 13 is
When pressure oil is sent to 4B, the piston 16 fitted in the cylinder 15 in an oil-tight manner moves forward, and the mandrel 18 moves forward to perform the drilling operation in the billet 30.

In this case, since the cylinder 18 is formed inside the crosshead 9 that protrudes in front of the main ram 8, it is possible to configure the cylinder and piston with large diameters, and the piercing force generating device 13 The strength of is billet 30
Even if the piercing is long or requires a large amount of piercing ability, the piercing ability can be sufficient.

The tip of the mandrel 18 is brought out into the hole of the die 6, and the outer shape of the mandrel 18 sets the inner shape of the product, and the hole of the die 6 sets the outer shape of the product, and in order to maintain this state during extrusion, an engaging block is used. 22 is engaged with the swing arms 23A and 23B to restrain the movement of the mandrel 18, high pressure is sent to the extrusion force generating device 3 as shown in FIG. It is extruded.

Note that, after the extrusion is completed, work steps such as cutting the extruded product A and the disk card are carried out as usual.

The present invention is as described above, and the advantages of the present invention as compared with the conventional examples shown in FIGS. 3 and 4 are as follows.

In addition, in FIGS. 3 and 4, members common to the present invention are indicated by adding a "dash" to the common reference numerals.

Figure 3 shows a tail rod type mandrel stopper device 24'.
A piercing cylinder 15' is provided in the main ram 8', and a piston 16' is fitted into the piercing cylinder 15' to form a piercing force generating device 13'.

FIG. 4 also shows the mandrel stopper device 24 configured in the form of a side stopper, and the piercing force generating device 13' in the main ram 8'.

The stopper device 24' shown in FIG. 4 can also be applied to the present invention, so its construction will be explained. The mandrel 18' and the mandrel holder 17' are rotated to the mandrel holder 17' via a rotating device 32 using a worm gear system or the like. A locking member 34 is provided on the extension of the head 33.

A mandrel stopper rod 35 is passed through a cylinder provided in the cylinder frame 1, and the movement of the mandrel 18' and the mandrel crosshead 33 can be restrained by a stopper block 35A at the tip of the rod 35 and a locking member 34.

On the other hand, a beam 36 is provided via the tie rod 25', and an adjusting screw 37 is screwed onto this beam 36 so that the tip of the screw 37 can freely come into contact with the stopper rod 35', so that the screwing forward and backward movement of the adjusting screw 37 can be adjusted. The stopper position of the mandrel 18' is adjustable.

An embodiment of the present invention including the mandrel side stopper device shown in FIG. 4 will be described with reference to FIGS. 5 and 6.

5 1 and 2 show that the mandrel crosshead 33 is slidably fitted into the guide cavity 9A formed in the crosshead 9 by the piercing force generating device 13 formed in the crosshead 9 of the pressurizing stem 20. The locking members 34 are attached to the left and right arms 33A of the mandrel crosshead 33, respectively.
A mandrel stopper rod 35 is connected to the stopper device 24 which is a side cylinder mechanism.

In addition, in the case shown in FIGS. 1 and 2, a piercing force is inserted into a mandrel crosshead 33 which is slidably fitted into a guiding cavity 9A formed in a crosshead 9 of a pressurizing stem 20. A generator 13 is provided, and the other features are the same as those in Figure 5 1.2, and this Figure 6 1 and 2.
The embodiment shown is also the same as the embodiment shown in FIGS. 1 and 2 in that the piercing force generating device 13 is built inside the crosshead 9.

As mentioned above, in the conventional example shown in FIGS. 3 and 4, since the piercing force generating device 13' is built in the main ram 8' of a certain size, the main ram 8' is subjected to internal pressure and external pressure. Since the L oil port 14B' is machined into the ram g, the stress is extremely severe, and the size of the piercing generating device 13' is inevitably limited, and only those with small capacity can construct it. In addition to this, machining of the oil passage of the oil port is also complicated.

As a result, due to structural constraints such as incorporating necessary components into an unreasonable space, it is not possible to increase the piercing power, and maintenance becomes difficult.

In this regard, in the present invention, since the piercing force generating device 13 is installed in the crosshead 9 that projects in front of the main ram 8, there is no mechanical restriction on setting the piercing force, and the structure itself This also simplifies maintenance, for example, by separating the crosshead 9 from the main ram 8.

Therefore, according to the present invention, the piercing ability can be strengthened and maintenance is easy, so it is very useful as a driving device for a tubular product extrusion press.

[Brief explanation of the drawing]

Figure 1 is a side sectional view of an example of the present invention at the initial position, Figure 2 is a side sectional view of the same during extrusion, and Figures 3 and 4 are side sectional views of the conventional example at the initial position. be. Furthermore, FIGS. 5 1 and 2 are plan and elevation cross-sectional views of the second embodiment of the present invention, and FIGS. 6 1 and 2 are plane and elevation cross-sections of the third embodiment of the present invention. It is a diagram. DESCRIPTION OF SYMBOLS 1...Main cylinder frame, 3...Extrusion force generation device, 7...Main cylinder, 8...
... Main ram, 13 ... Piercing force generator, 15 ... Piercing cylinder, 16 ...
... Piercing piston, 18 ... Mandrel, 24 ... Mandrel stopper device.

Claims (1)

[Scope of utility model registration request] Main cylinder frame 1 consisting of main cylinder 7 and main ram 8
In the drive device for a tubular product extrusion press, the crosshead 9 is connected to the main ram 8. A driving device for a press for extruding tubular products, characterized in that a piercing force generating device 13 is provided inside the crosshead 9, which projects forwardly from the main cylinder frame 1.