JPS6021163A - Production of metallic rod - Google Patents

Abstract

PURPOSE:To obtain a final extra-thin-walled rod without intermediate heat treatment by rolling a casting ingot obtd. by a continuous casting method using a heated mold as it is as a blank material for the rod. CONSTITUTION:The heated casting mold 3 of a holding furnace 1 for molten metal contains heating elements 4 and the inside wall surface thereof is maintained at the temp. above the solidifying point of a casting metal. The surface of the molten metal 2 in the furnace 1 is thereupon maintained always at approximately the same level as the wall surface on the top side of the mold 3 during casting. A cast blank material 6 for a rod is cooled with a cooler 5 and is passed through pinch rolls 7 and thereafter the material is rolled with plural rolling rolls 8 and is thus worked to an extra-thin-walled rod which is then coiled on a coiler 9. The material 6 has the structure in which the crystals consisting of single or plural crystals are thoroughly unidirectionally solidified according to the above-mentioned method and therefore the plastic working in the casting direction of said material is easily accomplished without surface cracking.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for manufacturing a metal strip that can roll a continuous #stripe material without applying medium-Ivl heat treatment. In more detail, the inner wall can be maintained at a temperature higher than the solidification temperature of V4 metal. Continuous h using uA type
A metal strip is manufactured by making the strip material obtained by ctA manufacturing consist only of a unidirectionally solidified structure with excellent workability, and rolling the strip material without surface grinding or intermediate heat treatment steps. METHODS AND APPARATUS.

Conventionally, the production of metal strips has been mainly carried out by repeatedly subjecting an ingot of I strip material to a tL treatment by solidifying it in a cooling # and then applying a plastic force meter such as a rolling and drawing force meter. It's here. For example, in plastic working of bronze, 99
% at least 5 times, and for pure copper and pure aluminum with good workability, at least 1 time.
It is known that medium Ivl annealing treatment of more than 10 times is required, and that cracks are likely to occur on the surface of the ingot when directly rolling the ingot of the strip material without heating. . Recently, with the rapid development of the electronic industry, electronic devices such as computers have become less desirable. As a result, the metal strips used in these products were required to be made thinner. As the thickness of such metal strips decreases, rolling becomes more difficult, and in order to obtain ultra-thin wall strips of 0.05 mm or less, such as metal tubes, it is necessary to roll the surface and interior of the original ingot. It is known that the presence of defects extremely affects the occurrence of cracks during processing of the strip, and therefore great efforts are made in the molten metal processing for the strip material and the removal of surface defects in the ingot. has been worn out. That is, a large amount of time and energy was consumed in removing inclusions and gases, reducing the amount of solutes present in the process, and grinding the surface of the ingot.

In the case of strip material ingots produced by conventional continuous casting, solidification progresses from the surface to the inside, which tends to cause impurities and gas to form in the center, and 1 mm of solidification also occurs in the direction of the casting direction, which is almost perpendicular to the casting direction. Columnar crystals that grew in the same direction were likely to develop on the surface layer.

For this reason, cracks are likely to occur during machining from the grain boundaries between the columnar crystals on the surface layer of the ingot, so the ingot is processed. ! &
The problem is that it has to be repeatedly treated to soften it and then undergo plastic processing to make thin strips. Applying repeated annealing treatments during the processing of the strip not only complicates the fabrication process of the strip, but also! ! & requires large consumption of time and energy for processing.

The present invention enables continuous #
All kinds of metal and alloy strip materials, such as aluminum, copper, iron, and stainless steel, which have been conventionally used as strip materials that can be melted and molded, are rolled as they are into ultra-thin strips of II finish. This is what makes it possible.

When the solidification structure of the strip material is made into a completely unidirectional solidification structure consisting of a single crystal or a plurality of crystals, plastic working in the #-building direction is extremely easy. That is, since there are no grain boundaries on the surface of the returned strip material, which are likely to cause cracks during processing, processing can be performed without surface cracks. The present inventor's invention (Patent No. 1049146) was used to obtain a unidirectional solidified strip material consisting of a single crystal or a plurality of crystals without any crystals grown in the vertical direction on the surface.
Gold III ingots can be easily cast using a continuous # system using heated molds. In other words, the conventional series vc
This is possible by using a heated mold instead of a cooling mold, completely preventing the nucleation of crystals on the inner walls of the mold, and allowing the ingot to cool only outside the mold. When rolling or drawing a strip material made by this method that consists only of a unidirectionally solidified structure, it is possible to process it without creating cracks on the surface. If such a strip is heat-treated midway through conventional rolling, the unidirectional solidification structure will be destroyed, the crystals will recrystallize, and become a fine polycrystalline body consisting of disordered crystals oriented rightward. There is a tendency for workability to decrease. Therefore, in carrying out the present invention, intermediate heat treatment can be omitted. 0.05m
If it becomes difficult to roll to the required thickness due to work hardening of the strip to obtain an ultra-thin strip of metal with a thickness of less than m, reduce the thickness of the #i structure of the original material. This can be easily resolved by doing this.

Conventionally, in order to obtain ultra-thin strips with a thickness of 0.05 mm or less, it was necessary to perform surface grinding to remove the scratches on the ingot that caused cracks in the strip, so the ingot was rolled as is. I couldn't put it on. However, it is impossible to connect the continuous ingot machine and the rolling machine, and in the continuous #1 manufacturing method using the heated mold, the surface of the strip material ingot is extremely smooth and beautiful, and it has good plasticity. Since there is no need for surface grinding prior to processing, a rolling machine is connected to a continuous casting machine, and continuous #
The ingot of the strip material that has been crushed by the machine can be immediately rolled and continuously processed into the final ultra-thin strip.

In order to carry out the present invention, it is of course possible to cut a unidirectionally solidified material that is continuously cast using a heating mold into a suitable length and then turn it into ultra-thin strips using a conventional rolling machine. However, a rolling machine is connected to the ingot outlet of a continuous casting machine having a heating mold, and the strip material continuously cast from the heating mold is rolled into a strip with a desired cross-sectional shape. can be finished. According to the method of the present invention, there is no need for an intermediate annealing process, so that metal strips can be manufactured continuously very easily by simply connecting a conventional rolling machine to a continuous M-rolling machine. It is possible.

FIG. 1 is a vertical cross-sectional front view of an apparatus for continuous production of one piece of gold, showing one aspect of the present invention.

(2) has the molten metal in the molten metal holding furnace (2). (2) is a heating mold with a built-in heating element (2), whose inner wall temperature is maintained above the solidification temperature of the cast metal. The molten metal level in the molten metal holding furnace (1) is always maintained in a conventional manner so that it is almost the same as the upper inner wall surface of the mold. (Not particularly shown) ■ is a water cooling device.

The cast strip material ingot ■ is passed through the pinch rolls of it ■ and processed into strips of the required thickness by multiple rolling rolls of ■, and then wound into the roll of ■ v9.4il to form the product. . ■ is the mold 7! This is a shielding plate to prevent i8 from falling.

FIG. 2 is a vertical cross-sectional front view of a continuous metal strip manufacturing apparatus in which a rolling device is connected to an upward continuous #forming machine, showing another embodiment of the present invention.

■ is a molten metal holding furnace with molten metal in ■. (2) is a heating mold with a built-in heating element, and the temperature of its inner wall surface is maintained above the solidification temperature of the cast metal. The molten metal level in the molten metal holding furnace is high! It is kept constant in a general manner so that it is approximately at the same level as the top of the exit of the rope. (Not particularly shown) ■ is a water cooling device and ■ is a water basin. The cast strip material ingot ■ is bent horizontally by the pinch roll [stock] and the guide tube O, and its ma'j, @? ! After being processed into strips of the required thickness with a number of rolling rolls, 0 rolls w1ei
It is rolled up into a product.

The method of the present invention is extremely useful for manufacturing strips of materials that are difficult to work with, such as phosphor bronze and stainless steel, and for forming strips of 1 taa. It is considered extremely difficult to manufacture strips with different wall thicknesses depending on the location of the cross section by rolling, as the force measurement due to the difference in wall thickness will vary depending on the location. It's here. Therefore, since fje has been produced, a method has been adopted in which a flat plate-shaped strip is subjected to a cutting process. According to the method of the present invention, irregular shaped strips 44 having a hole (I) cross section slightly smaller than the required cross-sectional shape are manufactured by continuous VC delivery using a heating mold, and the difference is easily made by rolling the irregular shaped strips 44. You can walk around the row.

According to the method of the present invention, not only can copper, aluminum, and iron strips with good dynamometer properties be manufactured, but also zinc, which has traditionally been considered difficult to use as a plastic dynamometer due to its hexagonal structure, can be manufactured without intermediate annealing. A method for obtaining TL thin-walled strips and diagonal strips of metal, which makes it possible to provide a plastic force meter with a cross-sectional size of 95% or more from an ingot without smoothing or surface grinding of the ingot. This is an extremely revolutionary invention in terms of energy saving, labor saving, and resource saving.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional front view of a main part of a metal strip continuous manufacturing apparatus showing one embodiment of the present invention, and FIG. 2 is a vertical cross-sectional front view of a main part of a metal strip continuous manufacturing apparatus showing another embodiment of the present invention. It is a diagram. ■ 0 Molten metal holding furnace ■ ■ Pinch roll ■ @ Molten ra ■ Q ■ Rolling mouth - rule ■ ■ Heating mold ■ @
Strip winder ■ ■ Heating element ■ Shield & plate ■ ■ Water cooling device ■ Water receiver ■ ■ Strip material ingot ■ Guide tube patent applicant

Claims (1)

[Claims] 1. The inner wall can be heated to a temperature higher than the solidification temperature of #Hiro metal! ! &
Metal strip manufacturing method 2 characterized by rolling an ingot of a strip material produced by continuous casting using a chisel die. Features of continuous metal strip production equipment