JPH01130814A - Separating and cutting device for dummy block and pressed cake in indirect extruding press - Google Patents

Abstract

PURPOSE:To strongly and surely separate a dummy block from a pressed cake by providing a device for separating the dummy block from the pressed cake in a central position of extrusion on a slide shear and a dummy block holder. CONSTITUTION:When revolution is made in the center of extrusion, a striker 19 having a round head is provided in a projecting shape at the front part of a clamp arm 15 which takes an upper position while a shoulder part 20 for rolling reduction is provided above the cutting edge of a slide shear 9 and the striker 19 and the shoulder 20 for rolling reduction are taken as separating means. Since the shoulder part 20 of the lowered slide shear 9 presses down the striker 19 provided in the clamp arm 15 of a dummy block loader holding the dummy block 10 exposed from a container 2 under the pressure of an elevating cylinder in the central position of extrusion, the dummy block 10 can be surely separated from the pressed cake 17.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improved indirect extrusion press that enables reliable separation of dummy blocks and lees prior to cutting the lees. .

(Prior art) A press stem is attached to one side of a pair of front and rear press frames that are connected by tie rods and face each other via a main ram, a cross head, etc., or a press stem and the press stem can move along and independently to the center position of the stem. A piercing mandrel to be inserted is arranged, a die stem is fixedly arranged on the other side, a movable container and a dummy block that can be carried in and out are arranged at an intermediate position between both steps, and the billet loaded in the container is arranged. By the simultaneous advancement of the press stem, dummy block and container against the die stem,
Indirect extrusion presses for producing rod- and tubular-shaped extruded products are well known, needless to be exemplified. In such an indirect extrusion press of the dummy block loading/unloading type, the handling operation of loading and setting the dummy block at the extrusion center position prior to the start of extrusion, and transporting and retracting the dummy block from the extrusion center position upon completion of extrusion is mechanically performed. Of course, it is also known that it can be carried out by other means, and here, the prior art is disclosed in Japanese Patent Application Laid-open No. 60-227918 filed by the present applicant.
The details are given as an example, and the details are given in the publication of the same issue, but the gist will be summarized below with reference to FIGS. 3 to 5.

That is, in FIGS. 3 to 5, a die stem 4 is fixedly provided on the counter frame 1, and a press stem 5 equipped with a piercing mandrel 6 is provided on the crosshead 8 (frame, A container 2 is held by a container holder 3 and movably arranged between the two (4.5). As shown in FIG. 3, on the container holder 3 of the movable container 2, a slide shear 9 for cutting the pressed lees 17 is installed on the upper side of the container holder 3 so that it can be raised and lowered by a lift cylinder 21. On one side, a dummy block loader 11 rotatably supported by a pivot shaft 12 is pivotable by a drive cylinder 14 between an extrusion center position a and a pivot center retracted position as shown in the figure. Loader 1
1 is provided with a lamp arm 16 that remains stationary and a lamp arm 15 that can be opened and closed with respect to the arm 16 via a clamp cylinder 13 at its tip, thereby making it possible to clamp and release the dummy block 10. Therefore, according to this configuration, after the extrusion of the billet is completed, as shown in FIG. After that, first, move the container 2 forward to expose only the dummy block 10 outside one end of the container 2 (the left end when facing FIG. The dummy block loader 11 is positioned within both arms 15 and 16 of the dummy block loader 11 advanced to position a, and the dummy block 10 is clamped by closing the clamp arm 15 with the clamp cylinder 13, and then the dummy block loader 11 is pushed out from the extrusion center position a. By retracting to the central retraction position,
The dummy block 10 is separated from the pressed lees 17 that stays inside the container 2.

Next, after evacuating the dummy block loader 11, the fifth
As shown in the figure, by moving the container 2 forward again, the pressed lees 17 portion is exposed outside one end of the container 2, and the lifting cylinder 21
The slide shear 9 is pushed down to cut the pressed lees 17 from the extruded product side.

Therefore, after cutting and removing the pressed lees 17, the container 2 is moved back and a new billet is loaded into the container 2 via a billet loader (not shown), and for the next extrusion, the dummy block loader 11 is Swivel the clamp arm 15.1 from the extrusion center retracted position to the extrusion center position a.
The dummy block 10 held between the containers 6 and 6 can be charged and set into one end of the container 2 by the press stem 5, thereby making it possible to use the dummy block 10 repeatedly. Note that 7 is a mandrel holder.

(Problems to be Solved by the Invention) The above-mentioned indirect extrusion press with a dummy block that can be used repeatedly is installed on the press machine side with a compact configuration,
Although this method has great advantages in terms of ease of set-up for carrying out the same block and improving the production cycle, the following problems remain. That is, the adhesion force between the dummy block 10 and the pressed lees 17 portion at the end of extrusion is strong, and on the other hand, it is stronger than the retraction force that causes the dummy block loader 11 to rotate from the extrusion center position a to the extrusion center retraction position. Often, the dummy block 10 is so large that the dummy block 10 and the lees 17 cannot be separated, which may prevent the lees cutting process from proceeding.

(Means for Solving the Problem) The present invention solves the above problem by utilizing the force of the slide shear 9 used for cutting the pressed lees 17 to strongly and reliably separate the dummy block 10 and the pressed lees 17. Specifically, it has a fixed die stem,
A press stem that can move forward and backward toward the stem, a movable container that is arranged between both stems so that it can move forward and backward, a slide shear that is provided along with the holder of the container so that it can move up and down, and a press stem that also has an extrusion center position and A dummy block holder that is movable across concentric retraction positions. In the indirect extrusion press, the slide shear and the dummy block holder are provided with means for separating the dummy block from the lees at the center of extrusion.

(Function) According to the above-described technical means of the present invention, as shown in FIGS. 1 and 2, the die stem 4 on the counter frame 1 side and the press stem 5 (equipped with a piercing mandrel 6) on the crosshead 8 side (including the press stem 5), the movable container 2 held by the container holder 3, the slide shear 9 for cutting pressed lees provided on the container holder 3, and the extrusion center position a and the extrusion center escape using the pivot 12 as a fulcrum. Clamp arm 1 that is pivotable throughout the withdrawal position
5. In an indirect extrusion press equipped with a dummy block loader 11 equipped with 16 at the tip, when the dummy block loader 11 rotates to the extrusion center position a, the upper clamp arm By providing a striker 19 as a constituent member of the separating means in the case of inversion, and forming a rolling shoulder 20 as a constituent member of the separating means in the case of rotating, at the extrusion center position a on the slide shear 9, as shown in FIG. After the extrusion is completed, move the dummy block loader 11 to the extrusion center position a with its clamp arm 15 open, and then move the container 2
is advanced to expose the dummy block 10 outside the container and onto the clamp arm 16, the clamp arm 15 is closed to clamp the dummy block 10, and then the slide shear 9 is lowered by the lifting cylinder 21,
The limiter lamp arm 1 is attached to the lowering shoulder 20 of the same shear 9.
By pushing down the striker 19 provided protrudingly on the 5 side and pivoting the dummy block loader 11 from the extrusion center position a to the extrusion center retraction position, the pressed lees 1
7, the dummy block 10 is smoothly and easily separated and can accompany the loader 11. Therefore, the container 2 is advanced again to expose the pressed lees 17 outside the container, and the sheath slide 9
By further pressing down, cutting of the pressed lees 17 is completed.

That is, compared to the driving cylinder 14 which is the motive force for turning the dummy block loader 11, the lifting cylinder 21 which is the motive force for cutting on the shear 9 side is powerful and has a large capacity for cutting by pressure. Toshikasu 17
This easily overcomes the adhesion force of the two and ensures rapid separation of the two, thereby solving the problems of the prior art.

(Example) A suitable example of the present invention will be described with reference to FIG. 1.2. A fixed die stem 4 is provided on the counter frame 1, and a press stem 5 is provided on a crosshead 8 together with a piercing mandrel 6, as is known, via a main cylinder, a main ram, etc. on a press frame facing the frame 1. It will be done. In the embodiment, a press stem 5 with a piercing mandrel 6 is shown for extruding a tubular body, but in the case of extruding a rod-shaped body, only the stem 5 is required, and both are collectively referred to as the press stem 5. A movable container 2 is disposed between both stems 4 and 5 via a container holder 3. Since these are similar to the conventional indirect extrusion press, only the main parts according to the present invention are illustrated in FIG. 1.2. A slide shear 9 for cutting the pressed lees 17 is provided on the upper part of the container holder 3 so as to be movable up and down together with a lifting cylinder 21.
A dummy block loader 11 is provided so as to be pivotable between an extrusion center position a and an extrusion center retraction position by means of a driving cylinder 14, and a dummy block loader 11 is provided at the tip of the loader 11 for holding and releasing a dummy block IO. A fixed clamp arm 16 is provided, and a lamp arm 15 which can be opened and closed by a clamp cylinder 13 is provided so that it can be opened and closed. In the embodiment, a striker 19 with a circular head is provided in a protruding manner at the front part of the upper clamp arm 15 when it is turned to the extrusion center position 11a, A rolling shoulder 20 is provided on the holder, and a striker 19 and a rolling head 20 serve as separation means. According to this embodiment, as described above in the section of operation, the striker 19 provided on the clamp arm 15 of the dummy block loader 11 that clamps the dummy block 10 exposed from the container 2 at the extrusion center position a. The lowering shoulder 20 of the slide shear 9 that has descended is pressed against the striker 1 under the pressure of the lifting cylinder 21.
By pressing 9, the dummy block 10 is pressed 1
7. Separation can be more reliably achieved. In the embodiment, the rolling shoulder 20 and the striker 19 are used as constituent members of the separating means, but it is of course not limited to only rotating, and it goes without saying that various modifications can be made in terms of design and structure. .

(Effect of the invention) The present invention provides a dummy block 1 along with a movable container 2.
In an indirect extrusion press having a dummy block loader 11 that handles
Although a small and small-capacity one is sufficient, this also increases the adhesive strength between the dummy block and the pressed lees, and the dummy block loader 1
By utilizing the powerful and large-capacity force that the lifting cylinder 21 of the slide shear 9 has for cutting the lees, By providing separation means such as the striker 19 and the rolling shoulder 20 on the dummy block holder 11 and the slide shear 9, the dummy block and the pressed lees can be strongly and reliably separated, thereby preventing press cycle interruptions, etc. It does not cause any trouble.

At this time, the slide shear 9 and the dummy block loader 11 have a relationship structure in which they meet at the extrusion center position a.
The separation means such as the striker 19 and the rolling shoulder 20 can also be easily interlocked in a compact structure, and are excellent as an improved separation between the dummy block and the pressed lees in an indirect extrusion press.

[Brief explanation of the drawing]

FIG. 1 is a side view of the main parts of an embodiment of the present invention, FIG. 2 is a longitudinal sectional front view of the main parts in the operating state at the end of extrusion, and FIG. 3 is a side view showing the main parts of a dummy block loader in the prior art.
FIG. 4 is a longitudinal sectional front view showing the loader operating state at the end of extrusion, and FIG. 5 is a longitudinal sectional front view showing the pressed lees cutting state. 2...Movable container, 3...Container holder, 4.
... Die stem, 5... Press stem, 6... Piercing mandrel, 9... Slide shear, lO...
・Dummy block, 11...Dummy block loader,
15.16... Clamp arm, 19... Striker, 20 Shoulder for lowering the river, 21... Cylinder for lifting/lowering. 71st”?l η!3 Figure WI2
Figure 4 Figure 5

Claims (1)

[Claims] (1) A fixed die stem, a press stem that can move forward and backward toward the stem, a movable container that is arranged between both stems so that it can move forward and backward, and a slide shear that is provided so that it can move up and down along with the holder of the container. , an indirect extrusion press also comprising a dummy block holder movably provided in the holder between an extrusion center position and a concentric retraction position; A dummy block for an indirect extrusion press, and a lees separation/cutting device, characterized in that a means for further separation is provided.