JPS61279639A - Manufacture of ingot from metallic scrap - Google Patents

Abstract

PURPOSE:To manufacture an ingot from metallic scraps of various sizes by packing the scraps into bottomed pipes made of the same metal as the scraps and melting and solidifying them. CONSTITUTION:Metallic scraps 1 of various sizes are packed into two pipes 2 having bottoms 2a made of the same metal as the scraps, and the pipes 2 are horizontally placed over a water-cooled mold 3 so that the bottoms 2a confront each other. When arc is generated between the pipes 2 as consumable electrodes, the scraps 1 melt and drop into the mold 3 together with the pipes 2. A pool of molten metal 5 is formed at the upper part of the mold 3, and at the lower part, molten metal is solidified by cooling with the mold 3 to form an ingot 6.

Description

[Detailed description of the invention] [Industrial application field] 1
This invention provides a consumable electrode type arc melting furnace;
Metal scrap% especially titanium, zirconium or □
゛ is scrap of refractory metals such as these alloys.
This metal strip is used as a consumable electrode with the electrode cut out from j.
□Method for manufacturing ingots by melting crap
1 related.

[Conventional technology]

Traditionally, metal scrap, especially refractory metal scrap such as titanium, silconyl laminate or their alloys:
To melt crap and make ingots,
``Consumable'', polar arc melting method is utilized.
'Thus, for example, to produce a titanium ingot from titanium scrap, the melted raw material, i.e.
,, Raqqa, 6, 0. ,f,,,L-kakeyo □-::
°□i′・ Hang it inside the crucible, and the tip and the melt in the copper crucible [
・; A current arc is generated between the electrode and the hot water, which gradually melts the electrode itself from its tip and drops it into the copper crucible to form a pool of bath water.The molten metal pool is solidified from below to form an ingot. However, in order to make the above-mentioned consumable electrodes from scrap using this melting method, the scraps are first sorted according to their size, and then those that are one size larger are placed under an argon seal and bathed together in the atmosphere. An electrode is made, chips and powder or small lumps are optionally pressed together with sponge titanium to make a preget, which is then welded together to make an electrode. The lumps are crushed into fine particles and then optionally pressed with titanium sponge to make briquettes.

This is then welded together to create an electrode.

[Problem that the invention seeks to solve]

However, in such a melting method, the method of manufacturing the consumable electrode must be changed depending on the size of the scrap, and therefore, it is not only necessary to sort the scrap in advance according to its size.

If the scrap is in the form of chips or small chunks, it will require additional pressing, and if the scrap is in medium sized chunks, it will require an additional grinding operation before the pressing.
There was a problem in that it took a lot of effort and time to make the consumable electrodes.

[Means for solving problems]

This invention was invented in view of the above-mentioned situation, and uses an electrode made from metal scrap as a consumable electrode in a consumable electrode type arc melting furnace, melts the metal scrap, and thereby generates: ? The method for manufacturing an ingot from metal scrap by solidifying hot water in a water-cooled mold to form an ingot,
The bottomed tubes made of the same material as the metal scraps are held horizontally on a water-cooled mold with their bottoms facing each other in the melting furnace, and the metal scraps are packed therein. The metal scrap is melted by generating an arc between the pipe materials, and the resulting bath water is dropped into a water-cooled mold and solidified.

[Detailed description of the invention]

In the present invention for manufacturing ingots from metal scraps, as shown in a side view of the outline of the manufacturing state in FIG. , the tubes 2 stuffed with scrap 1 in this way are placed horizontally on a water-cooled mold, such as a water-cooled steel mold 3, with their bottoms 2 facing each other, and an arc 4 is drawn between them as consumable electrodes. When generated, the metal scrap 1 constituting both electrodes is placed in a water-cooled steel mold 3 together with the tube material 2.
The molten metal falls inside, and the molten metal 5 is placed above the water-cooled copper mold 3.
Under the pool, the bath water 5 is cooled and solidified by a water-cooled copper mold to form an ingot 6.

In the invention, [the pipe material used may have any shape in cross section, but a pipe material with a circular or square cross section is usually preferred, and the bottom provided at one or both ends of the pipe material This is to prevent scrap from falling out of the pipe material when it is filled with scrap and before the pipe material filled with scrap is fed into the melting furnace and melted. The bottom part may be of any type as long as it prevents the scrap from forming. For example, if the size of the scrap is large enough, it may be shaped like a net, lattice, or slit. Although it is usually sufficient to provide this bottom portion at one end of the tube, it may also be provided at the other end, ie, at both ends, if necessary.

After the melt falls from the bottom of the pipe, some of the scrap stuffed inside the pipe may fall into the molten metal pool formed above the water-cooled mold without being melted during the melting process. However, the second-largest scrap is relatively small in size.

Easily melts in a molten metal pool heated by a high temperature arc.

In this invention, only one pipe material is processed at a time.
For example, in order to increase productivity, more consumable electrodes 1, for example, two or more pairs, may be placed facing each other, and these may be similarly melted.

The present invention is particularly advantageously applied to the production of ingots from scraps of refractory metals such as titanium, zirconium, or their alloys, but other metal scraps can also be melted by the consumable electrode arc melting method. It goes without saying that the present invention can be applied to any metal scrap that is suitable for this purpose.

〔Example〕

Next, the invention will be explained by way of examples.

Ti-6N/J-495Vf) composition, Ka6
A titanium alloy pipe with a bottom having dimensions of 0 war angle x length: 1200 w x thickness: 1 m is prepared, and this pipe is coated with a maximum of 40 m square from a minimum 10-square plate layer having the same composition as above. Filled with titanium alloy scraps of various sizes, the total weight of the pipe is 1
The weight was 13 kg, and the filling rate was 58%. Two of these are shown in Figure 1.

They were placed horizontally in an arc melting furnace with their bottoms facing each other, and they were used as consumable electrodes in a vacuum (2X 10-3
An arc was generated under the conditions of voltage: 40 V and electric power ff: 200 OA under (wmHg), thereby melting the consumable electrode to produce a cylindrical ingot having dimensions of diameter = 115 mm x length = 400 m. . The component analysis values of the scrap used in this example and the obtained ingot were as shown in Table 1.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, in a consumable electrode type arc melting furnace, metal scraps of various sizes ranging from chips to large lumps are packed into a pipe material as a consumable electrode. Since these metal scraps can be melted together, there is no need to sort the metal scraps by size, and there is no need for any complicated processes such as welding, pressing, or crushing.

The industrially beneficial effect is that ingots can be produced from metal scrap.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram drawn from the side to show the main points of the method of the present invention. In the figure, 1...metal scrap, 2...pipe material. 3.--Water cooling mold, 4. Arc. 5... Molten metal, 6... Ingot.

Claims (1)

[Claims] In a consumable electrode type arc melting furnace, an electrode made from metal scrap is used as a consumable electrode to melt the metal scrap, and the resulting molten metal is solidified in a water-cooled mold to form an ingot. In the method of manufacturing an ingot from scrap, bottomed tubes made of the same material as the metal scraps filled with the metal scraps are held horizontally on a water-cooled mold with their bottoms facing each other in the melting furnace. In this state, an arc is generated between the tubes filled with the metal scrap to melt the metal scrap, and the molten metal thus generated is caused to fall into a water-cooled mold and solidify. A method for producing the ingot.