JPS595049B2 - Intermediate frame indirect extrusion press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intermediate frame type indirect extrusion press that maintains the accuracy of the die stem even when the full force of the press is applied in the axial direction of the die stem during extrusion. The function is to resist the moment of shearing force that acts on the die stem when cutting the die stem, and to hold the die stem in an accurate position without centering, deforming, or breaking the billet. The object of the present invention is to provide an indirect extrusion press with a simple structure that can be more easily taken out and can sufficiently withstand loads even in this case.

The die stem in an indirect extrusion press has a generally long cylindrical shape, and if this type of indirect extrusion press is such that the stem cannot go in and out in the axial direction of the press via the press platen, the die stem can be placed precisely at the rear end of the press platen. Even if it is fixed, for example, during extrusion, when the full force of a powerful press is applied in the axial direction of the die stem, a large bending moment will be generated even with a small amount of eccentricity. Not only is it difficult to maintain the accuracy of the die stem, but it may also cause damage to the die stem.

Furthermore, due to the shearing force when cutting the product and the discard after extrusion, a large bending moment acts on the die stem, resulting in misalignment of the die stem, damage when installing the die stem, and the target dimension. There is a disadvantage that the product cannot be extruded.

For this reason, the applicant of the present case, for example,
As disclosed in Publication No. 82, various methods have been researched and developed, including the DyStem backup device.
None of the previous precedents can be called perfect.

In addition, in metal billet extrusion press equipment, more specifically, in indirect extrusion presses, if the billet inside the container becomes impossible to extrude due to the temperature drop ring of the hot billet, for example, the folded billet can be moved out of the container using the full force of the press. At the same time as taking it out, it is necessary to take it out from the center of the press.

At this time, the packed billet is discharged and pressed (discarded).
It must be considered that this is fundamentally different from removing .

In other words, pressed lees are unavoidable lees that exist on the container side of the die when extrusion is performed normally, and from a yield point of view, the amount is extremely small compared to billets, and the length of the lees depends on the length of the container. ) is also extremely short.

Therefore, when ejecting the pressed lees out of the container, the frictional force (between the container and the pressed lees) is small, so it can be ejected with a small amount of force, so no special consideration is requiredG).

The point is just to receive it in the trough. However, in the case of folded billets, this is an abnormal situation in which extrusion was not possible even though the billet was once stored in the container and an extrusion force was applied, so the billet is filled (upset) in the container and the container and billet The frictional force between the two is extremely large.

This is because the length (contact length) is extremely large compared to the discard.

Therefore, discharging folded billets requires an extremely large amount of strength, unlike discharging discards.
For this reason, when attempting to eject with the full force of the press, it is important to be able to sufficiently withstand the load.

This invention satisfies each of the above demands, and specific examples thereof will be described in detail with reference to the drawings.

Figures 1 to 4 illustrate an indirect extrusion press for hollow materials.
In the figure, 1 is a press platen, which is placed opposite the main cylinder frame (not shown), and is firmly fastened with columns 2 arranged diagonally to connect the press structure with a rigid frame structure to the press head 3. It is constructed collaboratively.

A through hole 4 is formed in the press center of the press platen 1, and a die stem slide guide 5 is provided on the rear surface of the press platen 1.

In addition, in order to understand the explanation, in the following explanation, the press direction is referred to as the front, and the opposite direction is referred to as the rear, but in the figure, the front is the right and the rear is the left.

A pair of upper and lower die stem slide guides 5 provided on the rear surface of the press platen 1 each have a sliding surface 5a perpendicular to the center of the press, and are firmly attached to the press platen 1.

Reference numeral 7 denotes a die stem slide, and in the cross-sectional form shown in FIGS. 3 and 4, the rear part is annular, and the base is a square block 8, which is attached to the slide surface 5 of the die stem slide guide 5.
The trough 9 fitted in the a is a trough, which is provided in the block portion 8 of the die stem slide 7 in a lateral extending manner via an arm 10, and the trough 9 has a shape of, for example, a figure 7 to receive the billet. It is possible.

11 is a long cylindrical die stem, die stem backer 1
2. It is provided at the center of the press via a die stem holder 13, die stem holder 14, etc.

A die stem bucker 12 is in contact with the rear end surface of the press platen 1 and fitted into the die stem slide 7 above the center of the press, and the front end surface of the die stem 11 is in contact with the rear end surface of the bucker 12.

A ring-shaped die stem holder 13 is fitted between the die stem slide 7 and the die stem 11.
A die stem holder 14 is fitted between the die stem holder 11 and the die stem holder 11, and the die stem holder 14 and the holder 13 are attached with a radial bolt 15.
The die stem 11 is held in cooperation with the die stem 1 and attached via the cock, and the die stem 11 is provided here at the center of the press.

The die stem 11 extends rearward, and a die 18 is provided at its free end via a die holder 19.

When either the die stem 11 or the trough 9 is located at the center of the press, the other is located outside the center of the press, and the die stem 11 and the trough 9 are movable between them along the guide surface 5a of the die stem slide guide 5 in a direction perpendicular to the center of the press. .

Reference numeral 20 denotes a die stem slide drive means, which is shown as a cylinder device in the figure, and is provided on a cylinder frame 21 provided on the side of the press platen 1, and its piston ram 2
0a is the attachment to the block portion 8 of the die stem slide I.

An intermediate frame 22 has an annular shape surrounding the die stem slide 7, and has a guide ring 23 on its rear end surface to surround the die stem 11 and guide it in contact with it in its longitudinal direction.

This intermediate frame 22 is moved in the press direction over a range exceeding the longitudinal direction of the die stem 11, and is provided with a guide means 24 and a moving drive means 25 for this movement.

The guide means 24 includes a pair of slide shoes 26 provided on the head 3 along the press direction via spacers 27a provided on a pair of arms 27 extending from the intermediate frame 22, and a drive means 25. consists of a cylinder device provided between the press platen 1 and the piston ram 25a thereof is attached to the intermediate frame 22.

A container 28 is provided via a container holder 29, and a piston ram 30 of a container moving cylinder is attached to the holder 29.

31 is a pressure stem, which is provided at the front of the crosshead,
The pressing force of the main cylinder device is transmitted through the main ram.

Further, 33 indicates a mandrel, and 34 indicates a vertical shear device.

In the present invention configured as described above, the hot billet A and the press plate 32 are loaded into the billet storage chamber 28a of the container 28, and then the billet A is loaded via the press plate 32 with a pressurizing stem in the illustrated example. Upset and mandrel 3
3, the billet A is pierced so that the tip of the mandrel 33 faces the hole of the die 18.

In this position, a pushing force is applied to the pressurizing stem 31 without any relative displacement between the container 28 and the billet A, and the container 28 is placed over the die stem 11 as shown in FIG. When moved forward, mandrel 3
The inner diameter of the product B is determined in step 3, and the outer diameter of product B is determined in die 18, and the hollow product is indirectly extruded.

During this extrusion, the die stem 11 is held at its mid-axial length via the guide ring 23 of the intermediate frame 22, so that high precision maintenance of the die stem 11 is guaranteed.

When extrusion of the billet is completed, the pressurizing stem 31 and the container 28 are retreated to the state shown in FIG. 1, and the intermediate frame 22 is positioned as shown by the chain line in FIG. The product and the pressed lees are cut by a vertical shearing device 34.

In this cutting, the intermediate frame 22 backs up the die stem 11 with its guide ring 23, and prevents the precision maintenance of the die stem 11 from being disturbed due to the shear force acting on the die stem 11.

During the above-mentioned extrusion process, when the billet A in the container 28 cools down and becomes impossible to extrude, the billet phenomenon occurs, and the folded billet is taken out from the container 28 and pressed. A so-called folded billet processing step is required to remove the billet to the outside.

In this process, first, the pressurizing stem 31 and the container 28 are retracted to the end, and the intermediate frame 22 is further moved to the left in the figure from the position indicated by the chain line in FIG. Make them retreat.

Next, since the die stem slide 7 is locked to the die stem slide guide 5 by the cooperation of the hydraulic jack and the tension bolt 17, after releasing this locking, the die stem slide cylinder 20 is moved to retract as shown in the figure. Then, the die stem 11 moves out of the press along with the die stem slide 7 in a direction perpendicular to the press direction via the guide of the guide surface 5a, and this movement of the die stem 11 out of the press causes the trough 9 to move toward the center of the press. ,
Take the position shown in Figure 5.

Thereafter, the intermediate frame 22 is advanced through the contraction of the moving means 25, and the front surface of the frame 22 is brought into contact with the rear surface of the die stem slide guide 7, and the container 28 is moved forward.
is moved forward to bring the front surface of the container 28 into contact with the rear surface of the intermediate frame 22.

This position is illustrated in FIG. 6, and when the pressurizing stem 31 is advanced via the main ram etc., the folded billet A' in the container 28 is projected into the trough 9 waiting at the center of the press. It is.

At this time, the folded billet A' and the container 28 are firmly covered, and the pressing force acts on the container 28 due to this friction.
The press platen 1, which is a rigid frame structure, takes charge of the press force through the die stem slide guide 7, and the jammed billet l-A' is smoothly and reliably projected into the trough 9. be.

After the folding billet L-A' is projected into the trough 9, the intermediate frame 22, container 28, pressure stem 31, etc. are returned to their original positions, and then when the drive means 20 of the die stem slide guide 7 is extended, the trough is 9 moves from the press center to the outside of the press, and at the same time, the die stem 11 enters the press center, and during the working time to lock the die stem 11 again, the folded billet A' on the trough 9 is taken out outside the press.

Note that the folded billet may be extracted by bringing the front end surface of the intermediate frame into contact with the rear end surface of the press platen.

The present invention is as described above, and according to the present invention, the folded billet can be automatically taken out of the press, and the processing time can be shortened. Because the midway of its shaft length is supported via an intermediate frame during extrusion, the precision of the die stem is maintained, and it also resists the shearing force when cutting the pressed lees and the product. Since the die stem is supported through the intermediate frame, misalignment of the die stem can be suppressed, and this has great industrial value.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing the main parts of the press of the present invention, FIG. 2 is a cross-sectional plan view of FIG. 1, and FIG.
The figures are cross-sectional views taken along the line 4-4 in Figure 1, Figures 5 and 6 show the processing steps for folded billets, Figure 5 is a cross-sectional plan view, Figure 6 is a longitudinal side view, and Figure 7 is an indirect view. It is a sectional view during an extrusion process. 1... Press platen, 5... Die stem slide guide, 5a... Guide surface, 7...
...Die stem slide, 9...Trough, 11...Die stem, 12...Die stem release force, 13...Die stem holder, 1
4...Die stem holder, 20...7 driving means, 22...Intermediate frame, 25...
. . . Intermediate frame drive means, 28 . . . Container, 31 . . . Pressure stem.

Claims (1)

[Claims] 1 In an indirect extrusion press of the type in which a die stem is provided on the rear end surface side of the press platen at the press axis and the die stem extends toward the container, the die stem is provided so as to be movable in the press axis direction between the press platen and the container. an intermediate frame that surrounds the die stem and is provided with a guide section in its longitudinal direction; a drive device for moving the intermediate frame in the press axis direction by a length exceeding the rear end of the die stem; an intermediate frame; and a guide means for guiding the intermediate frame parallel to the press axis direction between the press structures such as the press bed and the column; A die stem slide guide is provided which guides the die stem in a direction perpendicular to the press axis, and a die stem driving means is provided which allows the die stem to be moved and fixed between the press axis and the press axis, and the die stem is moved out of the press. An intermediate frame type indirect extrusion press, characterized in that a trough for receiving a folded billet is provided at the center of the press axis.