JPH0757370B2 - Dummy block of indirect extrusion press, sewer meal separation cutting device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved indirect extrusion press in which the dummy block and the cake are reliably separated from each other prior to cutting the cake.

(Prior Art) One of a pair of front and rear press frames connected by tie rods and facing each other, a press stem via a main ram, a crosshead, or the like, and the press stem and the stem can be moved together with the stem to the center position of the press stem. A piercing mandrel to be inserted into the container, a fixed die stem to the other, a movable container and a dummy block that can be carried in and out at the intermediate position between the stems, and the billet loaded in the container. The indirect extrusion press for obtaining a rod or a tubular extruded product by accommodating the press stem, the dummy block and the die stem of the container together is well known without exemplifying. In such a dummy block loading / unloading type indirect extrusion press, a hand rig operation of loading and setting the dummy block at the extrusion center position prior to the start of extrusion and mechanically carrying out the withdrawal and withdrawal of the dummy block from the extrusion center position upon completion of the extrusion is performed. Of course, it is also known to carry out by means, and here, as its conventional technique, the one disclosed in Japanese Patent Application Laid-Open No. 60-227918 previously filed by the present applicant is given as an example, and the details thereof are the same. As will be described in the gazette, the gist thereof will be summarized below with reference to FIGS. 3 to 5.

That is, in FIGS. 3 to 5, the die stem 4 is fixedly provided on the counter frame 1, and the press stem 5 having the piercing mandrel 6 is provided on the crosshead 8 in the illustrated example so as to face the die stem 4. , The main ram and the like are omitted), and the container 2 is held by the container holder 3 between the both 4 and 5 so as to be movable back and forth. In the container holder 3 of the movable container 2, as shown in FIG. 3, a slide shear 9 for cutting the lees 17 is installed on the upper side of the container holder 3 so that it can be raised and lowered by an elevating cylinder 21. A dummy block loader 11 pivotally supported by a pivot 12 is provided on one side of a drive cylinder 14
As shown in the drawing, the loader 11 can be swung over the push-out center position a and the pivot-center retracted position b, and the loader 11 can be opened and closed through the clamp arm 16 and the clamp cylinder 13 with respect to the arm 16. The clamp block 15 is provided at the tip of the dummy block 10 so that the dummy block 10 can be held and released. Therefore, according to this configuration, after the extrusion of the billet is completed, as shown in FIG. 4, the press stem 5 (in the case of rod-like extrusion) or the retreat of the press stem 5 and the piercing mandrel 6 (in the case of tubular extrusion as shown). After that, first, the container 2 is moved forward to expose only the dummy block 10 to the outside of one end of the container 2 (the left end in FIG. 4), and when the pre-clamping arms 15 and 16 are opened / closed, the extrusion center outside the one end is opened. The dummy block 10 is located in both arms 15 and 16 of the dummy block loader 11 that has advanced to the position a, and the clamp arm 15 is closed by the clamp cylinder 13 to clamp the dummy block 10.
By retracting 11 from the extrusion center position a to the extrusion center retreat position b, the dummy block 10 is separated from the lees 17 that remain in the container 2.

Then, after the dummy block loader 11 is retracted, as shown in FIG. 5, the container 2 is re-advanced to expose the lees 17 portion outside one end of the container 2, and the slide cylinder 9 is pressed down by the lifting cylinder 21. Thus, the cake 17 is cut from the extruded product side.

Therefore, after cutting and removing the lees 17, the container 2 is retracted to load a new billet into the container 2 via a billet loader (not shown), and the dummy block loader 11 is loaded in the next extrusion. The dummy block 10 which is swung from the push-out center retracted position b to the push-out center position a and sandwiched between the clamp arms 15 and 16 can be loaded and set into one end of the container 2 by the press stem 5.
As a result, the dummy block 10 can be repeatedly used. Reference numeral 7 is a mandrel holder.

(Problems to be solved by the invention) The above-described indirect extrusion press capable of repeatedly using the dummy block is installed on one side of the press machine under a compact structure,
Although the block loading / unloading set can be easily achieved and the production cycle can be greatly improved, the following problems remain. That is, the adhesion force between the dummy block 10 and the leech 17 portion after the completion of the extrusion is strong, while the dummy block loader 11 is stronger than the retracting force for rotating the dummy block loader 11 from the extrusion center position a to the extrusion center retracted position b. Often large,
There may be a problem that the dummy block 10 and the lees 17 part cannot be separated from each other, which may prevent the lees cutting process.

(Means for Solving Problems) The present invention solves the above problems by using the force of the slide shear 9 used for cutting the lees 17 to form the dummy block 10 and the lees 17
The parts can be strongly and surely separated, and specifically, a fixed die stem, a press stem capable of advancing and retracting toward the stem, and an advancing and retracting portion arranged between the both stems. Indirect extrusion press consisting of a movable container, a slide shear that is movable along with the holder of the container and is movable up and down, and a dummy block holder that is also movable in the holder between the extrusion center position and the center retracted position. In the above, a shoulder for reduction is provided above the cutting blade of the slide shear, a striker with a circular head is provided in the dummy block holder, and the slide shear descends with respect to the dummy block holder at the extrusion center position. When the cutting blade portion comes into contact with the lees, the reduction shoulder portion and the striker head portion are arranged in abutting relationship with each other. Lies in the fact you are.

(Operation) According to the above 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 on the crosshead 8 side (piercing mandrel 6 are provided. (Including the press stem 5), the movable container 2 held by the container holder 3, the slide shear 9 for cutting the lees provided on the container holder 3, the extrusion center position a and the extrusion center escape centering around the pivot 12 as a fulcrum. Clamp arm 15,1 that can swivel over retracted position b
In an indirect extrusion press equipped with a dummy block loader 11 having 6 at the tip, as shown in FIG. 1, when the dummy block loader 11 is pivoted to the extrusion center position a, the upper clamp arm 15 has By providing a striker 19 as a constituent member of the separating means and forming a pressing shoulder 20 as a constituent member of the separating means in the illustrated example at the extrusion center position a on the slide shear 9,
As shown in the figure, after the extrusion is completed, the dummy block loader 11 is opened with its clamp arm 15 and the extrusion center position a
, And then move the container 2 forward to expose the dummy block 10 to the outside of the container and clamp arm.
16, the clamp arm 15 is closed and the dummy block 10 is sandwiched, and then the slide shear 9 is pressed down by the lifting cylinder 21, and the pressing shoulder 20 of the shear 9 projects to the clamp arm 15 side. Striker 19
By pushing down and moving the dummy block loader 11 from the extrusion center position a to the extrusion center retracted position b, the dummy block 10 can be smoothly and easily separated from the lees 17 and accompany the loader 11, and thus the container 2 By re-advancing, the scraps 17 are exposed to the outside of the container, and the shear slide 9 is further pressed to complete the cutting of the scraps 17.

That is, as compared with the drive cylinder 14 that serves as the motive power for turning the dummy block loader 11, the lifting cylinder 21 that serves as the motive power for cutting on the shear 9 side is strong and has a large capacity for rolling down. Since the adhesive force of the slag and the lees 17 can be easily overcome and a quick separation between the two can be surely performed, the problems of the prior art are solved.
Further, according to the present invention, the slide shear makes a vertical linear motion, and the dummy block holder makes an arc motion between the extrusion center position and the retracted position. Since the contact with the point contact is a point contact, it is possible to smoothly perform the movement of both.

(Example) A suitable example of the present invention will be described with reference to Figs. The counter frame 1 is provided with a fixed die stem 4, and the press frame 5 facing the frame 1 is provided with a press stem 5 and a piercing mandrel 6 on a crosshead 8 via a main cylinder, a main ram and the like.
It is provided with. In the embodiment, the press stem 5 provided with the piercing mandrel 6 for extruding the tubular body is shown. However, in the case of extruding the rod-shaped body, only the stem 5 is necessary, and both are collectively referred to as the press stem 5. A movable container 2 is arranged between the stems 4 and 5 via a container holder 3. Since these are similar to the conventional indirect extrusion press, only the essential parts according to the present invention are shown in FIGS. On the upper part of the container holder 3, a slide shear 9 for cutting the lees 17 is provided so as to be able to move up and down together with a lifting cylinder 21, and a dummy block loader 11 is provided on one side of the holder 3 by a pivot 12 and a drive cylinder 14. But,
The dummy block 10 is provided at the tip of the loader 11 so as to be rotatable between the extrusion center position a and the extrusion center retracted position b.
A fixed clamp arm 16 for clamping and releasing
On the other hand, a clamp arm 15 that can be opened and closed by the clamp cylinder 13 is provided so that it can be opened and closed. In the embodiment, the upper clamp arm when swiveling to the extrusion center position a
A striker 19 having a circular head 15 is provided at the front in a protruding shape, whereas a reduction shoulder 20 is provided above the cutting blade of the slide shear 9, and the striker 19 and the reduction shoulder are provided. Separation means by 20. According to this embodiment, as described above in the section of action, the dummy block exposed from the container 2 at the extrusion center position a.
Clamp arm of dummy block loader 11 holding 10
Slider 9 that descended to striker 19 provided on 15
The pressing shoulders 20 of the pressing push down the striker 19 under the pressure of the lifting cylinder 21 to press the dummy block 10.
17 can be separated more reliably. In the embodiment, the reduction shoulder 20 and the striker 19 are the constituent members of the separating means,
Of course, it is needless to say that the present invention is not limited to the illustrated examples, and various modifications can be considered in terms of design and structure.

(Effects of the Invention) The present invention accompanies the movable container 2 and the dummy block 10
In the indirect extrusion press having the dummy block loader 11 for handling, the loader 11 is downsized,
Since the movement process is also short, the turning drive cylinder 14 is small,
Although a small-capacity one is sufficient, because of this, the adhesive force between the dummy block and the lees makes it difficult to separate the dummy block from the lees, which makes it difficult to separate the dummy block from the lees. Using the strong and large-capacity force that the lifting cylinder 21 of 9 has for cutting the dregs, the dummy block holder 11 and the slide shear 9 are provided with a separating means such as a striker 19 and a shoulder 20 for reduction. As a result, the dummy block and the lees can be strongly and reliably separated, and troubles such as interruption of the press cycle do not occur.

At this time, since the slide shear 9 and the dummy block loader 11 have a relational structure where they meet at the extrusion center position a,
Since the striker 19 has a circular head and the contact with the pressing shoulder 20 is a point contact, the interlocking relationship can be easily obtained in a compact structure. Excellent as an improved separation of.

[Brief description of drawings]

FIG. 1 is a side view of an essential part of an embodiment of the present invention, FIG. 2 is a vertical sectional front view of an operational state of the essential part at the end of the extrusion, and FIG. 3 is a side view showing an essential part of a dummy block loader in the prior art.
FIG. 4 is a vertical cross-sectional front view showing a loader operating state at the end of the extrusion, and FIG. 5 is a vertical cross-sectional front view of the same lees cutting state. 2 ... movable container, 3 ... container holder, 4 ... die stem, 5 ... press stem, 6 ... piercing mandrel, 9 ... slide shear, 10 ... dummy block, 11 ... dummy block loader, 15, 16 …… Clamp arm, 19 …… Striker, 20 …… Reduction shoulder, 21 ……
Lifting cylinder.

Claims (1)

[Claims] 1. A fixed die stem, a press stem that can move forward and backward toward the stem, a movable container that can be moved forward and backward between the two stems, and a slide that can be moved up and down along with a holder of the container. In an indirect extrusion press consisting of a shear and a dummy block holder that is also provided in the holder so as to be movable across the extrusion center position and the retracted position, a reduction shoulder is provided above the cutting blade of the slide shear, and a dummy is provided. The block holder is provided with a striker with a circular head, and when the slide shear descends with respect to the dummy block holder at the extrusion center position, before the cutting blade comes into contact with the raft, the reduction shoulder and striker. Of the indirect extrusion press, which is arranged in abutting relation with the head of the Location.