JPS5941809B2 - Metal profile extrusion method and device - Google Patents

Description

Detailed Description of the Invention This invention eliminates the need to cut off the butt end halfway by pressing the rear end of the preceding billet with the tip of the next billet to continue extruding the shape material. The present invention relates to a method and apparatus for extruding metal shapes with the aim of improving yield reduction caused by cutting, complication of post-processing of dummy blocks, defects in products due to cutting, etc.

When extruding conventional shapes, the butt end is cut in order to remove the dummy block from the rear end of the billet, but in this way the butt end cannot be used.
This causes a decrease in yield, and when cutting, the rear end cut surface of the front billet becomes irregular and tends to cause defects such as air being easily trapped.The butt end is stuck to the removed dummy block. However, there were various drawbacks such as the difficulty of fully mechanizing the process and the heavy reliance on human labor.

However, in this invention, by separating the container into two, or by using touring and the container in combination, only the dummy block is removed before reaching the rear end face of the die, and the rear end of the billet in the front is cut. By sequentially extruding the shapes by pressing with the tip of the next billet, they succeeded in overcoming the above-mentioned drawbacks of the conventional method and shortening the extrusion cycle time.

Furthermore, by dividing the container into two, it became possible to extrude a molded material with an outer diameter larger than that of the billet.

That is, to explain this invention with reference to the embodiments shown in FIGS. 1 to 6, the first container 1 and the second container are
Containers 2 of
1), and press the stem 7 in the direction of the solid arrow 9 in the usual manner.

In this way, the front surface of the dummy block 5 is located at the same position A as the contact surface between the first container 1 and the second container 2.
When this is reached (Fig. 2), move the second container 2 backward, insert the separator 4 into the gap between the first container and the second container, and remove the dummy block 5 (Fig. 3). , then move the second container back to its old position,
The next billet 6a is inserted into the second container, and the extrusion operation is started again using the stem 7 through the dummy block 5 (FIG. 4).

The stroke of the stem γ in the above is regulated in advance up to the contact surface between the second container and the first container.

While continuing to work in this manner, all material is pushed out without cutting off the butt end.

Next, at the end of the work, the stroke of the stem is extended until the dummy block reaches the rear end surface of the die (Fig. 5), and when the specified position is reached, both the first container 1 and the second container 2 are moved back. A cutting blade 8 is inserted between the first container 1 and the die 3 to cut off the butt end 10 and remove the dummy block.

According to the above embodiment, since the butt end is not cut off while the work continues, all the material is effectively extruded and the yield can be improved, and the cycle in which the dummy block can be used is simplified and the butt end is cleared. It is also possible to fully automate this process.

Since the dummy block in the above embodiment has a recessed discontinuation surface with the end of the billet, the rear end surface of the billet is formed into a convex shape when being suppressed.

Therefore, as shown in Figure 4, when the tip of the next billet is brought into pressure contact with the rear end of the previous billet, the center comes into contact first, and as the pressing force increases, the peripheral edge gradually touches,
Since they are in close contact with each other, air is not trapped in the abutting portion, and the air present in the abutting portion is discharged from the abutting surfaces of the first container and the second container.

Therefore, when the rear end of the preceding billet is flat, it is desirable that the leading end surface of the next billet be convex, and it is also conceivable to make both end surfaces convex.

Furthermore, if the dummy block is made to have a concave arc cross section as in the embodiment, its periphery will elastically deform toward the hole wall of the container when it is pressed against the billet 1, making it easier to maintain airtightness. For example, its periphery deforms inward due to friction with the container hole wall, reducing resistance.
Such a dummy block can be attached to the stem and used continuously.

In such a case, the dummy block can be replaced every time the billet is replaced, and even if the same dummy block is used repeatedly, there is no risk that the frictional resistance will become abnormally large at the rear end of the stem.

Even in such a case, the contact position between the preceding billet and the next billet is the contact position between the first container and the second container, and when the ends of the billet contact, the air in the area is exhausted. It will be necessary to consider whether it can be done.

Next, in the embodiment shown in FIGS. 7 to 10, a die head wool ring 11 is fitted instead of dividing the container into two, and the hole 11a on the side of the toe ring 11 where the die is not fitted (the right side in the figure) is The hole diameter is the same as that of the hole 12a of the container 12.

In the above device, if the billet 6 is inserted as shown in FIG. 7 and pushed in, and the rear end of the front billet is inserted up to the contact area between the toe ring 11 and the container 12 as shown in FIG. For example, the container 12 is moved back, the separator 4 is inserted, the dummy block is removed, the container 12 is returned to the old position, and the next billet is inserted.
Repeat the above operation to continue extrusion.

In this embodiment, the butt end cannot be cut at the end of the operation, but the material remaining in the toe ring is kept at 70°C to 80°C, similar to the material remaining in the die.
After performing a dissolution treatment with a force soda solution having a concentration of 10 parts or more at 0° C., it can be treated by performing a honing treatment or the like using a liquid sandblasting solution or the like.

Further, in Fig. 11, a circular hole into which a billet can be inserted is provided in the second container, and an oval hole 1a is provided in the first container, the short diameter of which is the same as the diameter of the billet, and the long diameter of which is a predetermined length. This is an example, and FIG. 12 shows the entrance part 1 of the toe ring.
1b is circular, and the die abutting side 11c is an oval shape with a predetermined major axis.

By making the hole of the first container or touring circular in shape in this manner, it is possible to extrude a molded material having a cross-sectional length larger than the outer diameter of the billet.

In the conventional seed extruder, one container 13 was placed in contact with the rear of the die 3 as shown in Figs. Since the dummy block 14 was removed by cutting the butt end in step 8, not only did the yield deteriorate by the amount of the butt end, but the shape of the cut portion also worsened the contact condition with the next billet. However, in this invention, the extrusion work is continued sequentially without cutting the butt end during the work, so all the above-mentioned drawbacks of the conventional method can be improved. Ta.

Furthermore, by dividing the container into two parts, it is possible to completely exhaust the air at the billet joint, and it is also possible to extrude a shaped material having a cross-sectional length longer than the outside diameter of the billet.

[Brief explanation of the drawing]

Figures 1 to 6 show the extrusion process according to an embodiment of the present invention in which the container is divided into two parts. Figure 1 shows the billet being inserted, and Figure 2 shows the billet being pushed to a predetermined depth. Figure 3 is a diagram with the dummy block removed.
Figure 4 shows the next billet inserted, Figure 5 shows the stem inserted to the furthest position at the end of the work, and Figure 6
The figure shows the butt end cut off and the dummy block removed. Figures 7 to 10 are usage process diagrams of an embodiment using toe rings, Figure 7 is a billet insertion diagram, Figure 8 is a diagram with the billet pushed to a predetermined position, and Figure 9 is a diagram showing the dummy block. The removed figure, Figure 10, shows the next billet inserted. Figure 11 is a sectional view of a container with a circular hole;
The figure is a cross-sectional view of a toe ring with a circular hole, and Figures 13 to 15 are cross-sectional views of a conventional extrusion device. The final view, FIG. 15, shows the butt end being cut and the dummy block being removed. 1...First container, 2...Second
container, 3... dice, 4...
Separator, 5...Dummy block, 6...
...Billet, 7...Stem, 8...
... Cutting blade, 9 ... Solid line arrow, 10 ...
・Butt end, 11...Touring, 12
．． 13...Container.

Claims (1)

[Claims] 1. In a method of extrusion-molding a mold material of a predetermined cross section by pressing a billet inserted into a container toward a die, a dummy block whose billet contact surface is formed into a concave arc shape is used, and the front Once the second container is pushed to the contact area between the first container and the second container, the second container is moved back, the dummy block is removed, and the second container is returned to its old position. The next billet is inserted into this, and the tip of the next billet directly presses the rear end of the previous billet to continue extruding the shape, so that the rear end of the next billet is inserted into the first container. When the abutment part of the second container is reached, the operation of removing the dummy block and the subsequent steps are repeated to successively extrude the shape materials by direct contact between the billets without cutting off the butt ends. Method of extruding metal shapes. 2. In a method of extruding a mold material of a predetermined cross section by pressing a billet inserted into a container toward a die, if the billet in the front position is pushed to the abutment area between the first container and the second container, For example, move the second container backwards, remove the dummy block, return the second container to its old position, insert the next billet into it, and use the tip of the next billet to cover the previous billet. Continue extruding the shape material by directly pressing the rear end of the billet, and when the rear end of the next billet reaches the contact area between the first container and the second container, remove the dummy block. A method for extruding a metal profile, characterized in that the following steps are repeated, and one or both of the abutting portions of the billet are protruded to prevent air from being enclosed in the abutting portions. 3 In a device that presses a billet inserted into a container toward a die to extrude a mold material with a predetermined cross section, the container is divided into a first container and a second container, and the first container is moved into and out of contact with the die. The second container is installed so as to be separable from the first container, and the butt end cutting blade is installed removably between the die and the first container. A metal profile extrusion device, characterized in that a dummy block removing device is installed between a container and a second container.