JPH10328728A - Device for separating discard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically separate a discard from a dummy block by installing a dummy block hole on the center of the dummy block, fitting a shapes mandrel in the dummy block hole part during extruding and preventing the back flow of the discard to the dummy block hole. SOLUTION: After completing of extruding, a stem 11 is retreated together with a shapes mandrel 14 and the shapes mandrel 14 is separated from a hollow dummy block. Next, a container 1 is retreated and the hollow dummy block 15 is retreated together with an extruded product 6 and the discard 7. Next, the extruded product 6 on the rear side of a die 4 is cut with sawing set between the container 1 and the die 4. In succession, the container 1 is advanced, the rear end of the extruded product 6 remaining in a die hole 5 is pushed by using the top end part of the discard 7 and it is separated from the die 4. The hollow dummy block 15 being fitted with the discard 7 is taken out to the off-line as one body by advancing the stem 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for automatically separating a discard from a dummy block in hot extrusion of a metal billet such as steel or Ti.

[0002]

2. Description of the Related Art Extrusion of a section steel by hot extrusion of steel and Ti will be described with reference to FIG. After heating the cylindrical billet in a heating furnace (not shown), the billet is moved to the container 1, the stem 2 is advanced, the billet is pushed through the solid dummy block 3, and the billet passes through the die hole die 5 in the die 4. Thus, a predetermined extruded product 6 is obtained.

[0003] After the extrusion is completed, the extruded product 6, the discard 7 as the left end of the product, and the solid dummy block 3 are retracted by retracting the container 1. Next, the extruded product 6 behind the die 4 is cut by a saw (not shown) between the container 1 and the die 4. Subsequently, the container 1 is advanced and the rear end of the extruded product 6 remaining in the die die 5 is pushed by using the front end of the discard 7 to be separated from the die 4.

[0004] The separated extruded product 6 is sent to the next step ahead by a transport roller. Next, the container 1 is retracted again together with the solid dummy block 3 and the discard 7, and after the tip of the discard 7 is separated from the die mold 5, the dice 4 are taken off-line to maintain the die mold 5. To take out.

On the other hand, the solid dummy block 3 in which the discards 7 remaining in the container 1 are fitted is taken off-line as an integral object by moving the stem 2 forward. The removed discard 7 and dummy block 3 are transferred to a separator operated by an off-line worker.

Hereinafter, the operation of removing the discard 7 from the separator will be described with reference to FIG. In the conventional separator, an operator fixes the solid dummy block 3 with a clamp 8 driven by a hydraulic cylinder (not shown), and then moves the solid dummy block 3 by a jaw 9 driven by a hydraulic cylinder (not shown). A space is generated by compressing and unloading the discard protruding portion 10 protruding to the side surface, and then rotating the dummy block 3 in the circumferential direction,
By compressing and unloading the discard protruding portion 10 at another position on the circumference and repeating the operation, the voids in the circumferential direction are increased, and the solid dummy block 3 and the discard 7 are separated. Was separated.

[0007]

The automation of discard separation work has been strongly demanded in order to improve productivity, and the inventors have prototyped a separator that automates the above-mentioned discard protruding part compression / unloading work. Although various experiments were conducted, separation failure occurred due to various forms of the discard protruding portion, and it was difficult to automate discard separation.

The present invention solves such a conventional problem, and provides an apparatus for automatically separating a discard from a dummy block in hot extrusion of a metal billet such as steel or Ti. Things.

[0009]

SUMMARY OF THE INVENTION The present invention is directed to steel or T
In hot extrusion of a metal billet made of i or the like, a dummy block hole is provided in the center of a dummy block, and during extrusion, a mandrel for a shape steel is used to fit this into the dummy block hole and close it, thereby forming a discard. To prevent backflow into the dummy block hole and separate the discard from the dummy block, fix the dummy block with a clamp and then push the bar through the dummy block hole to easily and securely insert the discard. The present invention relates to a device for further separating. Further, the ratio d / D, which is the ratio of the outer diameter d of the punching bar to the outer diameter D of the billet, is equal to 0.
The present invention relates to a discard separating apparatus characterized by being in the range of 2 to 0.7.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples. Direct hot extrusion of a section steel will be described with reference to FIG. The stem 11 includes an outer layer 12 and a shaped steel mandrel holder 13, and a shaped steel mandrel 14 is attached to the tip of the shaped steel mandrel holder 13 during extrusion. The mandrel for section steel 14 is provided with a dummy block hole 16 provided at the center of the hollow dummy block 15.
Is set so that the back flow of the discard 7 hardly flows during extrusion and the top is at the same level as the hollow dummy block 15. After heating the cylindrical billet in a heating furnace (not shown), the billet is moved to the container 1 and the stem 11, the mandrel 14 for the shaped steel are used.
Then, the hollow dummy block 15 is advanced to push the billet and pass through the die hole die 5 in the die 4 to obtain a predetermined extruded product 6. At this time, since the clearance between the mandrel for section steel 14 and the dummy block hole 16 is small, the discard 7 hardly flows in by the backflow.

After the extrusion is completed, the stem 11 is first retracted together with the mandrel 14 for the shape steel, and the mandrel 14 for the shape steel is separated from the hollow dummy block 15. Next, the hollow dummy block 15 is retracted together with the extruded product 6 and the discard 7 by retracting the container 1.
Next, the extruded product 6 behind the die 4 is cut by a saw (not shown) set between the container 1 and the die 4. Subsequently, the container 1 is advanced and the discard 7
Of the extruded product 6 remaining in the die mold 5 by using the tip of the die, and separated from the die 4.

[0012] The extruded product 6 separated is sent to the next process in the front by a conveying roller. The container 1 is retracted again together with the hollow dummy block 15 and the discard 7, and after the tip of the discard 7 is separated from the die mold 5, the dice 4 are taken off-line in order to maintain the die mold 5.

On the other hand, the hollow dummy block 15 in which the discard 7 remaining in the container 1 is fitted is
By moving the stem 2 forward, the stem 2 is taken off-line as an integral object. The removed discard 7 and hollow dummy block 15 are transferred to an off-line automatic separator.

The operation of removing the discard 7 from the automatic separator will be described below with reference to FIG. In the automatic separator, the hollow dummy block 15 is automatically fixed by the clamp 8 driven by an air cylinder (not shown).
Next, the discard 7 can be separated from the hollow dummy block 15 by passing a punching bar 17 driven by a motor (not shown) into the dummy block hole 16.

In practice, in the extrusion of stainless steel sections,
The diameter of the steel punching bar 17 is d, and the billet diameter is D.
Table 1 shows the results of investigating the effect of d / D on discard separation. Here, when the discard was able to be separated by one punching operation, it was marked as ○, and the punching operation was 2
Those that were required more than once were marked as x.

The target steel type is SUS304 and the billet diameter is 2
When a round bar having an extrusion ratio of 20 was extruded, the diameter of the punching bar was set such that d / D was 0.05 to 0.
It was varied up to 7. In addition, S45C and SUS410 were investigated under the same conditions.

[0017]

[Table 1]

As a result of the investigation, when d / D is 0.2 or more, all discards can be removed by one operation.
When d / D was less than 0.2, a case requiring two or more operations occurred, resulting in discard separation failure. This is because, when d / D is less than 0.2, the rigidity of the punching bar is insufficient, and the position is shifted at the time of punching, and a position shifted from the center of the dummy block hole is pushed. Similar results were obtained for S45C and SUS410.

Next, the target steel type was SUS304, the billet diameter was 200 mm, and the extrusion ratio was 10, 15, 20, 25, 3
In the case where 0,35 round bars were extruded, an investigation was carried out in the case where an extrusion operation for discard separation was performed under the condition that the diameter of the punching bar was 0.2 in terms of d / D.
In each case, the discard could be separated by a single punching operation. Similar results were obtained for S45C and SUS410.

[0020]

According to the present invention, it is possible to automatically separate a discard from a dummy block in hot extrusion of steel and Ti.

[Brief description of the drawings]

FIG. 1 (a) is a cross-sectional view during direct hot extrusion of a shaped steel according to the present invention, and FIG. 1 (b) is a plan view of a die.

FIG. 2 is a cross-sectional view at the time of discard separation by the separator of the present invention.

FIG. 3 (a) is a cross-sectional view at the time of conventional shape steel direct hot extrusion, and FIG. 3 (b) is a plan view of a die.

FIG. 4 is a cross-sectional view when a discard is separated by a conventional separator.

[Explanation of symbols]

 Reference Signs List 1 container 2 stem 3 solid dummy block 4 die 5 die hole 6 extruded product 7 discard 8 clamp 9 jaw 10 discard protrusion 11 stem 12 outer layer 13 mandrel holder for section steel 14 mandrel for section steel 15 hollow dummy block 16 Dummy block hole 17 Punching bar

Claims (2)

[Claims] In hot extrusion of a metal billet, a shaped steel mandrel is fitted and closed at the center of a dummy block during extrusion, and a punching bar is used to separate a discard from the dummy block after extrusion. A dummy block hole for separating a discard through the discarding device. 2. The discard separation according to claim 1, wherein the ratio d / D, which is the ratio between the outer diameter d of the punching bar and the outer diameter D of the billet, is in the range of 0.2 to 0.7. apparatus.