JPS61279638A - 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 a bottomed pipe made of the same metal as the scraps and melting and solidifying them. CONSTITUTION:Metallic scraps 1 of various sizes are packed into a pipe 2 having a bottom 2a made of the same metal as the scraps, and the pipe 2 is horizontally held above a hearth 4 in a vacuum melting furnace. When electron beams 3 are irradiated on the pipe 2 from the bottomed end toward the other end, the scraps 1 melt and drop into the hearth 4 together with the pipe 2, forming a pool of molten metal 6. The molten metal 6 in the hearth 4 overflows continuously into a water-cooled mold 7. A pool of molten metal 6 is formed at the upper part of the mold 7, and at the lower part, molten metal is solidified by cooling with the mold 7 to form an ingot 8.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a method for manufacturing metal scraps: 7” in a vacuum melting furnace.
Scrap of refractory metals like IPlFK titanium, zirconium or their alloys! The present invention relates to a method of manufacturing an ingot by melting with an electron beam or a plasma electron beam.

[Conventional technology]

Traditionally, scrap metal, especially scrap of refractory metals like titanium, zirconium or their alloys! Melt it into an ingot! To manufacture.

Chips or small chunks of scrap fed into the hearth in the vacuum melting furnace! A method is used in which the ingot is melted by an electron beam or a plasma electron beam, and as a result, the molten ingot accumulated in the hearth is transferred into a water-cooled mold, and the solidified ingot is pulled out from below the mold.

[Problem that the invention seeks to solve]

However, in this ingot manufacturing method, even if metal scrap contains heavy cutting tool powder such as charcoal-bittungsten powder, it will be trapped in the hearth and will not mix into the ingot. Although there are advantages, scraps must be sorted by size in advance, and 1. Since only small-sized scraps such as chips or small lumps can be processed, the process is time-consuming and the range of scrap that can be processed is limited.

[Means for solving problems]

This invention was invented in view of the above-mentioned situation. Metal scrap in a vacuum melting furnace! Melting with an electron beam or plasma electron beam and solidifying the resulting molten metal in a water-cooled mold to form an ingot.K
Therefore, in the method for manufacturing an ingot from metal scrap, the metal scrap is packed into a bottomed tube made of the same material as the metal scrap, and the tube is held horizontally on a hearth in the melting furnace. Then, the tube material is melted by heating it with an electron beam or a plasma electron beam sequentially from the bottom end to the other end, and the molten metal thus produced is dropped into the hearth, and this molten metal is poured into the hearth. After the molten metal is collected in the mold, the upper part of the molten metal is poured into a water-cooled mold by overflow and solidified.

[Detailed description of the invention]

In this invention for manufacturing ingots from metal scraps, as shown in a side view of the outline of the manufacturing state in FIG. stuffing,
While this is held horizontally on a base 4 in a vacuum melting furnace, it is inserted from its bottom end into a zone 5 which is heated to a high temperature by an mWIk source, an electron beam or a plasma electron beam 3. When the scrap metal 1 is introduced little by little toward the other end, the melt falls into the hearth 4 together with the pipe material 2, forming a pool of molten metal 6, and the supernatant of this molten metal 6 flows from the hearth 4 into the water-cooled mold 7. Overflows continuously. In the upper part of the water-cooled mold 7, a pull of the molten metal 6 is formed, while in the lower part, the molten metal is cooled and solidified by the water-cooled mold 7, and an ingot 8 is formed.

Although the tube used in this invention may have any shape in cross section, it is usually preferable to use a tube with a circular or square cross section, and the bottom provided at one or both ends of the tube may be This is to prevent scrap from falling out of the pipe material when filling it with scrap and before the pipe material filled with scrap is fed into the melting furnace and melted. In this case, this bottom part may be of any type.For example, if the size of the scrap is large enough, it may be in the form of a net, a grid, or a slit. Although it is usually sufficient to provide this at one end of the tube, it may be provided at the other end, ie, at both ends, if necessary.

After the bottom of the pipe material has melted, fill it into the pipe material:
During the melting process, some of the loaded scrap may fall unmelted into the hearth; however, due to its relatively small size, it cannot be easily accessed by the electron beam or plasma electron beam. Easily dissolves in the molten metal in the eight chambers.

In this invention, only one pipe material is processed at a time.
For example, in order to increase productivity, a plurality of books may be fed into the heating zone 5 at the same time.

The present invention is particularly advantageous in the production of ingots from scraps of fusible metals such as titanium, zirconium, or their alloys, but it can also be applied to other metal scraps by electron beam or plasma electron processing in a vacuum melting furnace. It goes without saying that the present invention can be applied to any metal scrap suitable for melting with a beam.

Since metal scraps of various sizes can be melted all at once, the range of metal scraps that can be processed can be expanded.Furthermore, the molten metal is first collected on a hearth, and the supernatant liquid is poured into a water-cooled mold by overflow to form an ingot. This provides an industrially useful effect in that an ingot from which tungsten carbide and other heavy impurities are removed can be obtained.

[Brief explanation of drawings]

Figure gJ41 is an explanatory view drawn from the side to illustrate the main points of the invention. In the figure, 1...metal scrap, 2...pipe material. 3...Kugen, 4...Haas 6...
Molten metal, 7... water-cooled mold. 8...Ingot.

Claims (1)

[Claims] A method for manufacturing an ingot from the metal scrap by melting the metal scrap with an electron beam or a plasma electron beam in a vacuum melting furnace, and solidifying the molten metal thereby produced in a water-cooled mold to form an ingot, The metal scrap packed in a bottomed tube made of the same material as the metal scrap is sequentially transferred from the bottomed end of the tube to the other end while the tube is held horizontally on a hearth in the melting furnace. The molten metal is melted by heating with an electron beam or a plasma electron beam, and the resulting molten metal is dropped into a hearth and collected in the hearth, and then the supernatant of the molten metal is placed in a water-cooled mold. The method for manufacturing an ingot, characterized by injecting and solidifying by overflow.