JPS6334724Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a pullback-type indirect extrusion press, and more specifically to a double-acting type of press that is capable of extruding tubular products.

(Prior Art) As a pullback type indirect extrusion press, for example, as disclosed in Japanese Utility Model Publication No. 59-2887, there is a type having a billet scalper on the extrusion center axis between a fixed platen and one movable platen.

(Problems to be Solved by the Invention) Although the extrusion press described above is useful to some extent, it cannot extrude tubular products.

The present invention replaces the pullback type indirect extrusion press, which was previously only seen as a single-acting, dedicated machine, with a pullback type that can extrude high-quality, high-precision tubular products and is also easy to maintain due to its simplified structure. A double acting indirect extrusion press is provided.

(Means for Solving the Problem) The technical means of the present invention for solving the problems of the prior art described above is that movable platens 2 and 3 connected to each other by a column 4 are arranged before and after a fixed platen 1. , an extrusion force generating device 7 is provided above and below and/or left and right between the fixed platen 1 and one movable platen 2, and a container device 8 and a die stem 9 are arranged between the fixed platen 1 and the other movable platen 3. In the pullback type indirect extrusion press, a piercing cylinder mechanism 14 is provided on the press axis on the side opposite to the extrusion zone of the fixed platen 1 via a reaction force durable member 15, independently of the extrusion force generating device 7, The piercing cylinder mechanism 14 is provided independently of the extrusion force generating device 7, and the piercing cylinder mechanism 14 has a mandrel 21 on the extrusion direction side that cooperates with the die hole 13 of the die stem 9 to define the shape of the extruded material 38B. This is a pull-back type double-acting indirect extrusion press characterized by being equipped with a liquid feeding switching valve mechanism 37 that reciprocates the mandrel 21 on the press axis.

(Function) In FIG. 3, the container device 8 is placed over the die stem 9, and in this state, the billet 38 is carried onto the press axis via the billet roller 39, and then the container device 8 is fixed as shown in FIG. By being moved toward the platen 1, the billet 38 is inserted into the billet chamber of the container 1.

Next, the die stem 9 is attached to the side cylinder mechanism 3.
3 toward the fixed platen 1 side in an unloaded state as shown in FIG. 5, the billet 38 in the container 10 is upset.

Next, by sending pressure oil to the cylinder 16 of the piercing cylinder mechanism 14 as shown in FIG. 6, the mandrel 21 is moved in the piercing direction, and the billet 38 in the container 10 is perforated on its axis. Ru.

The piercing shown in Fig. 6 is performed using mandrel 2.
When the piercing is completed, the front and rear ends of the mandrel stopper mechanism 25 are connected to the engagement part 24 of the tail rod 23 of the piercing cylinder mechanism 14. A pair of gate members 26 are engaged, and the movement of the mandrel 21 is restrained therein, and by sending pressure oil to the extrusion force generating device 7 as shown in FIG. 7, the tip of the mandrel 21 is The tubular product 38A is indirectly extruded while maintaining the relative position between the die hole 13 and the die hole 13.

When the extrusion is completed, the main ram 6 of the extrusion force generating device 7 is moved back as shown in FIG.
At the same time, the gate member 26 of the mandrel stopper mechanism 25 is disengaged from the engaging portion 24, and the mandrel 21 is moved backward.

Then, as shown in FIG. 9, the die slide 29 provided on the fixed platen 1 is slid in a direction perpendicular to the press direction, and the opening 32 formed in the slide 29 is positioned on the press axis. By moving the container device 8 and the die stem 9 forward, the pressed lees 38B are stored in the opening 32 as shown in FIG. 10, and in this state, the die slide 29 is slid in a direction perpendicular to the pressing direction. ,
As shown in FIG. 11, pressed lees 38B and tubular product 38A
By cutting the seal block 31 on the press axis, positioning the opening 32 outside the press, and extending the pusher 36,
The pressed lees 38B of the opening 32 are pushed out and reach the initial position as shown in FIG. 12, at which point one press cycle is completed.

(Embodiment) Referring to FIGS. 1 and 2, a press according to a first embodiment of the present invention is illustrated.

In the figure, a pair of movable platens 2 and 3 are placed opposite to each other in front and behind a fixed platen 1, and the movable platens 2 and 3 are arranged diagonally.
are connected to each other by.

A pair of upper and lower extrusion force generating devices 7 consisting of a main cylinder 5 and a main ram 6 are provided between the fixed platen 1 and one of the movable platens 3.

Therefore, the movable platens 2 and 3, which are disposed before and after the fixed platen 1 and are connected to each other by the column 4, are movable in the horizontal direction in the figure by the extrusion force generating device 7.

A container device 8 and a die stem 9 are provided between the fixed platen 1 and the other movable platen 2, and the container device 8 includes a container 10 having a billet chamber above the center of the press, a holder 11 of the container 10, etc. It is movable in the left-right direction (press direction) by the expansion and contraction action of the container moving cylinder mechanism 12.

The die stem 9 has a cylindrical structure attached to the movable platen 3, and has a die hole 13 at its tip that defines the external shape of the extruded material, and the die hole 13 is located on the center line of the press.

A piercing cylinder mechanism 14 is provided on the press axis on the side opposite to the extrusion zone of the fixed platen 1, that is, on the side of the movable platen 2, via a reaction force durable member 15 indicated by a tie rod.

The cylinder mechanism 14 includes a cylinder tube 16 attached to the fixed platen 1 via a tie rod 15, and a piston ram 17 fitted to the cylinder tube 16. A piercing piston rod 18 is connected to the piston ram 17. The rod 18 is engaged with a mandrel crosshead 19 so as to be freely rotatable relative to the mandrel crosshead 19 around its axis and freely together in the pressing direction, and a mandrel 21 is attached via a mandrel holder 20.

The mandrel crosshead 19 is held by a mandrel rotating device 22 provided on the fixed platen 1 side.

Further, a tail rod 23 is connected to the piston ram 17 of the piercing cylinder mechanism 14, and the tail rod 23 is provided with an engaging portion 24 shaped like a flange.

Incidentally, the engaging portion 24 may be fixedly movable in the length direction of the tail rod 23 by being fitted onto the tail rod 23 with a screw.

Therefore, the piercing cylinder mechanism 14 is advanced toward the die stem 9 by feeding pressure oil in the direction of extension, and the billet is pierced, and the mandrel 2 is inserted into the die hole 13 of the die stem 9.
When the tip of the mandrel 21 is exposed, the relative position between the die hole 13 and the tip of the mandrel 21 during extrusion is maintained by the pair of gate members 26 of the mandrel stopper mechanism 25 being engaged with the engaging portion 24. be done.

The mandrel stopper mechanism 25 is connected to the movable platen 2
A stopper frame 28 is provided on the rear side, and in this embodiment, a stopper frame 28 is attached to the movable platen 2 via a reaction force durable member 27 shown by a tie rod, and a stopper frame 28 is attached to the stopper frame 28 so as to rotate around an axis in the press direction. A pair of front and rear gate members 26 are provided so as to be movable or to be able to slide back and forth toward the press axis, and the gate members 26 can be engaged with and disengaged from the engaging portion 24 .

In addition, in FIGS. 1 and 2, the fixed platen 1 is equipped with a die slide 29 that is movable in a direction perpendicular to the press axis via a cylinder mechanism 30. A guide portion 1A is formed.

A seal block 31 and an opening 32 are formed in the die slide 29.
can be fitted into the billet chamber of the container 10,
The positions of the seal block 31 and the opening 32 can be alternately changed on the press axis by a cylinder mechanism 30.

Further, a side cylinder mechanism 33 is provided between the fixed platen 11 and the movable platen 2, and
The fixed platen 1 is provided with a lees shearing mechanism 34 that can freely move forward and backward in a direction perpendicular to the press axis.

Further, on the opposite side from the pressed lees shear mechanism 34, a pressed lees pusher mechanism 35 which is operated in parallel to the pressing direction is provided as shown in FIG.

The second embodiment shown in FIG. 13 is an embodiment in which a mandrel rotating device 22 is slidably provided on the main cylinder 5 of the extrusion force generating device 7 via a holder 36 as a guide surface 5A, and other basics The configuration is shown in Figure 1 with reference to Figures 1 to 12.
In common with the embodiment, common parts are indicated by common symbols.

Furthermore, although the examples shown in FIGS. 1 to 13 are shown as a so-called fixed mandrel using a chipped mandrel, the present invention can also be adopted in the case of a so-called flow press.

That is, as shown in FIG. 15, the oil on the forward side of the piercing cylinder is blocked by the liquid feeding switching valve mechanism 37 of the piercing cylinder mechanism 14, and the oil is pushed out with the gate member 26 open. However, it is still possible.

That is, the present invention allows the following extrusion.

1. With the solid billet of the first embodiment shown in FIGS. 3 to 12, extrusion using a so-called fixed mandrel using a chipped mandrel is possible using the mandrel stopper mechanism 25.

2. It is possible to extrude a solid billet using a so-called fixed mandrel using a straight mandrel by using the mandrel stopper mechanism 25.

3. So-called flow pushing using a straight mandrel with a solid billet is possible by opening the mandrel stopper mechanism 25 and hydraulically blocking the forward side of the piercing cylinder 16 via the liquid feeding valve mechanism 37.

4. Extrusion using a so-called fixed mandrel using a tipped mandrel in a hollow billet is possible by using the mandrel stopper mechanism 25.

5. Extrusion using a so-called fixed mandrel using a straight mandrel with a hollow billet is possible by using the mandrel stopper mechanism 25.

6. So-called flow pushing using a straight mandrel with a hollow billet is possible by opening the mandrel stopper mechanism 25 and blocking the forward side of the piercing cylinder 16.

One press cycle of the first embodiment will be explained once again with reference to FIGS. 3 to 12.

FIG. 3 shows an example of the feeding state of the billet 38. When the billet 38 is fed onto the press axis by the billet loader 39, one of the billet loaders 39 is retracted outside the press and placed in the container as shown in FIG. By retracting the moving cylinder mechanism 12, the billet 38 is inserted into the container 10.

Note that when the billet 38 is inserted into the container 10, the billet loader 39 is retreated out of the press,
Waits for the next billet to be inserted.

Next, as shown in FIG. 5, by contracting the side cylinder mechanism 33, the movable press platens 2 and 3 are moved to the left, where the die stem 9 comes into contact with the billet 38 of the container 10 in an unloaded state. As a result, the billet 38 will be upset.

Next, as shown in FIG. 6, the piercing process is carried out, in which the mandrel 21 is advanced by sending oil to the piercing cylinder 16 through the switching operation of the valve mechanism 37, and the oil inside the container 10 is moved forward. A billet 38 is drilled.

When the mandrel 21 finishes perforating the billet 38, the tip of the mandrel 21 faces the die hole 13, where the cross-sectional shape of the extruded material is set, and this state is maintained during extrusion.

That is, in the first embodiment, as shown in FIG. In the embodiment shown in FIG. 15, the piercing cylinder 16 is maintained by blocking it as shown in the figure by the liquid feeding switching valve mechanism 37, and is now in the extrusion preparation position, and in this state, oil is supplied to the extrusion force generating device 7. The movable platens 2, 3 and the die stem 9 attached thereto are moved to the left of the arrow in FIG. The tubular product 38A is manufactured from the die stem 9 by extrusion.

In this case, in the first embodiment, the mandrel stopper mechanism 25 is attached to the movable platen 2,
Since the gate member 26 of the stopper mechanism 37 is engaged with the engaging portion 24 of the tail rod 23, the mandrel 21 is moved along with the movable platens 2, 3.
Here, the relative position of the mandrel 21 and the die hole 13 will be maintained during extrusion.

Furthermore, in the case of the embodiment shown in FIG. 15, by blocking the circuit on the forward side of the piercing cylinder mechanism 14 and keeping the gate member 26 of the mandrel stopper mechanism 25 open, so-called flow extrusion is possible. A tubular product 38A is manufactured by indirect extrusion.

When extrusion is completed, the gate member 26 is opened as shown in FIG. 8, and the main ram 6 and container 10 are slightly retreated as shown in FIG.
B is placed in the container 10, and then the die slide 29 is slid by the cylinder mechanism 30 in a direction perpendicular to the pressing direction, and the slide 2
The opening 32 formed at 9 is aligned with the center of the press (see FIG. 9).

By moving the container device 8 and die stem 9 from this state as shown in FIG.
After taking out the pressed lees 38B into the opening 32, by extending the shear cylinder mechanism 34, the pressed lees 38B and the product 38A are separated as shown in FIG.
is cut, and the pressed lees 38B is moved outside the press as shown in FIG. The initial position is determined by matching the .

Figures 16 to 19 show billet supply (first
This is another embodiment of the present invention showing the steps of billet insertion (Fig. 17), piercing (Fig. 18), and extrusion (Fig. 19); the mandrel stopper mechanism 25 is omitted. is different from the previous example, and other configurations are the same, so common parts are indicated by common symbols.

In addition, in the example of FIGS. 16 to 19, the 19th
As shown in the figure, by locking the liquid feeding switching valve mechanism 37, flushing and pushing becomes possible.

20 to 24 show a side stopper structure as the mandrel stopper mechanism 25, in which the locking rod 23 having the engaging portion 24, that is, the aforementioned tail rod, can be freely engaged with and detached from the movable platen 2 via the cross head 23A. Fig. 20 shows billet supply, Fig. 21 shows billet insertion, Fig. 22 shows upsetting, and Fig. 23 shows billet insertion.
The figure shows piercing, and Figure 24 shows extrusion.
Other common parts are indicated by common symbols.

Moreover, FIG. 25 shows a press that is different from the presses shown in FIGS. 20 to 24 described above in that it enables continuous pressing.

(Effect of the invention) In the present invention, in a pullback type indirect extrusion press, the piercing cylinder mechanism 14 is provided on the press axis on the side opposite to the extrusion zone, so pipe material can be extruded with high quality and precision. Can be molded.

Further, since the piercing cylinder mechanism 14 is independent from the extrusion force generating device 7, the overall structure is simplified, maintenance is easy, and the reliability of the equipment can be increased.

Further, the piercing cylinder mechanism 14 can be reciprocated and fixed by a liquid feeding switching valve mechanism 37, and can also be switched to flow-push mode.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing the first embodiment of the present invention, Fig. 2 is a view taken along the arrow A-A in Fig. 1, Figs. 3 to 12 show one press cycle, and Fig. 3 is a billet Figure 4 is a side sectional view of the feeding process, Figure 4 is a side sectional view of the billet insertion process, Figure 5 is a side sectional view of the upsetting process, Figure 6 is a side sectional view of the piercing process, and Figure 7 is a side sectional view of the extrusion process. Fig. 8 is a side sectional view after the extrusion completion process, Fig. 9 is a side sectional view of the die slide movement state, Fig. 10 is a side sectional view of the lees ejecting process and shearing process, and Fig. 11 is the side sectional view of the die slide movement state. Figure B-B line cross-sectional arrow diagram, Figure 12 is the 11th
A cross-sectional view at the initial position in the same direction as in the figure,
Fig. 13 is a side sectional view of the second embodiment, Fig. 14 is a side sectional view during extrusion with a fixed mandrel using a straight mandrel, and Fig. 15 is a side sectional view during extrusion with a fixed mandrel using a straight mandrel. FIG. 16 to 19 are side cross-sectional views showing billet supply, billet insertion, piercing, and extrusion steps in order, showing other embodiments of the present invention, and FIGS. FIG. 25 is a side sectional view of another embodiment of the present invention having a side stopper mechanism showing the steps of insertion, upsetting, piercing, and extrusion in the order of steps. FIG. 3 is a side cross-sectional view during extrusion. 1...Fixed platen, 2, 3...Movable platen, 4...Column, 7...Extrusion force generation device, 8
... Container device, 9 ... Die stem, 14 ...
Piercing cylinder mechanism, 15... Reaction force durable member, 21... Mandrel, 23... Tail rod, 24... Engaging portion, 25... Mandrel stopper mechanism, 26... Gate member, 37... Switching valve of 14 structure.

Claims (1)

[Claims for Utility Model Registration] Movable platens 2 connected to each other by columns 4,
3 are arranged in front and behind the fixed platen 1, and push force generating devices 7 are provided above and below and/or on the left and right between the fixed platen 1 and one of the movable platens 2,
In a pullback type indirect extrusion press in which a container device 8 and a die stem 9 are arranged between the The piercing cylinder mechanism 14 is provided independently of the extrusion force generating device 7.
The mandrel 21 cooperates with the die hole 13 of the die stem 9 to define the shape of the extruded material 38B on the extrusion direction side.
A pullback type double-acting indirect extrusion press characterized in that it is equipped with a liquid feeding switching valve mechanism 37 that reciprocates the mandrel 21 on the press axis.