JPS597524B2 - Extrusion method in extrusion press - Google Patents

Description

Detailed Description of the Invention The present invention eliminates scrap at all in the process of extruding and cutting a long billet after casting into predetermined dimensions when extruding aluminum and aluminum-containing metals, copper and copper alloys, and other metals. The present invention also relates to an extrusion method in an extrusion press that aims to safely and reliably supply billets without supervision.

Conventionally, billets in extrusion presses were cut into predetermined dimensions, but recently long billets have been cast,
A technique has been proposed and implemented in which billets of a predetermined size are formed by supplying the billet to an extrusion device and then cutting it to form a billet of a predetermined size. However, when a long billet is cut into a predetermined size, cut ends are always produced.

In this case, if the size of the cut end material is 100 dragons or more, cut the next billet so that the cut end material and the tip of the next long billet meet the specified dimensions, and then cut both the front and rear billets. The entire billet is handled as a single billet and extruded, but when the cut end material is short (r00n or less), the billet may fall over while being fed, or the cut end may become severely flattened during cutting, making it difficult to work. These are all scrapped as they cause problems.

Therefore, the product yield will decrease by that amount.

Furthermore, when handling relatively short billets, there is a risk that they may come off the transfer system due to an unexpected accident, or become stuck in the transfer system and become unable to be transferred, so it is common practice to have a supervisor in the area. Ta.

However, in the present invention, the rear end of the front remaining billet and the tip of the rear long billet are brought into contact with each other, and after they are joined together by electric welding or other methods, they are sequentially cut into predetermined dimensions. The process is virtually the same as cutting a long endless billet, eliminating the need for scraps and eliminating the need for supervisors as there is no risk of trouble with the transfer system when feeding billets. be.

That is, to explain this invention with reference to an embodiment, after heating a long billet 2 made of aluminum in a billet furnace 1, its tip is brought into contact with the rear end of the residual fillet 4 in the front position, and the outer periphery of the contact portion is placed in a billet joining machine. Join with 3.

Next, this joined billet is sequentially cut into predetermined dimensions from the tip side by a billet shear 5 to form a billet 6, which is sent to a predetermined position 6a of an extrusion press, and is pressed by a stem 7 in the usual manner to form a container 9. The material enters, is extruded from the die 8, and becomes an elongated material with a predetermined cross-sectional shape.

In the above, a known metal joining machine such as an electric welding machine, a gas welding machine, or a pressure welding machine can be used as a joining device for long billets. Therefore, there is no need for the joint to maintain the same mechanical strength as the non-joint part, and as long as it has the strength to maintain the joint, it is possible to weld multiple parts without continuous welding. Spot welding can also accomplish the purpose.

However, since it is undesirable for impurities from the welded portion to be mixed into the extruded product, it is desirable that the groove 12 at the joint portion is not deep.

If the groove is relatively shallow, the impurities become butt ends and are extracted along with the outer skin, and there is no negative effect on the shape material.

For example, if friction welding is performed and the raised part of the welded part is cut, the joint will be made only of billet material and there is no risk of contamination by impurities.

Figure 2 is a side view showing an example of a billet joining machine.
Two sets each of a groove cutting milling cutter 10 and a welding machine 11 are used to form a groove 12 at the joint and weld the joint.

In this case, if we weld the entire circumference, there is a risk of entrapping air into the joint surface, so we recommend welding in 2 to 3 places along the periphery of the joint or leaving 2 to 3 unwelded parts to leave an exhaust gap. Make it.

Further, if an exhaust groove is provided diametrically or radially on the end face of the billet material as necessary, even if all the contact parts are welded, the air in the joint can be exhausted from the exhaust groove without any problem.

In the above embodiment, the billet long material was heated in the billet furnace 1 and then joined to the preceding billet material.
It is also possible to join the front and rear billet long materials before the billet furnace (that is, before heating).

In short, before cutting the billet to a fixed length, the front and back billet materials are joined to form an endless type, so that it can be handled as if it were a continuous object, and there are no limitations on the joining position or joining method.

That is, according to this invention, since the front and rear billet materials are cut after being joined, when supplying unit billets, they all have the same dimensions, which not only simplifies the supply device and enables unmanned management, but also It has the effect of eliminating scrap and dramatically improving yield.

[Brief explanation of the drawing]

FIG. 1 is a principle diagram of an apparatus for implementing the present invention, FIG. 2 is a side view of a joining machine, and FIG. 3 is a partially enlarged sectional view showing an example of a billet joint. 1...゜... Billet furnace, 2... Billet long material, 3... Billet joining machine, 4...
...Previous billet material, 5...Billet shear, 6, 6a...Unit billet, 7...
...Stem, 8.Dice, 9..Container, 10..Beveling milling cutter, 11.
...Welding machine, 12...Bevel at joint.

Claims (1)

[Claims] 1. In a method of supplying a long billet to an extrusion device, cutting it into a predetermined size, and then inserting it into an extrusion press to extrude form a shape, the trailing end of the remaining billet at the front is The front end of the rear elongated billet is integrally joined, and then billets of a predetermined size are sequentially cut from the front end side of the billet, and the billets are fed to an extrusion press to extrude a mold material of a desired shape. Characteristic extrusion method in extrusion press. 2. In a method in which a long billet is supplied to an extrusion device, cut into a predetermined size, and then inserted into an extrusion press to extrude form a shape material, a rear long billet is placed at the rear end of the front remaining billet. The front end of the billet is brought into contact with the billet, and at least a part of the outer periphery of the contact part is left unattended by welding. Then, billets of a predetermined size are sequentially cut from the front end side of the billet, and the billets are fed to an extrusion press. An extrusion method in an extrusion press characterized by extrusion molding a mold material of a desired shape.