JPS60191641A - Horizontal and continuous casting method of metal - Google Patents

Abstract

PURPOSE:To perform steadily and smoothly horizontal and continuous casting of a molten metal by supplying the molten metal into a heated casting mold which is opened at the top surface, detecting the temp. distribution of the molten metal in the open part of the casting mold and controlling the position of the solidification boundary of the molten metal. CONSTITUTION:The temp. distribution of a molten metal 6 in the open part of a heated casting mold 1 which is attached to a holding furnace 3 so as to penetrate therethrough, contains a heating element 4 to permit heating and is opened partly or wholly at the top surface thereof is detected by a non-contact temp. sensor 7 or a thermocouple (not shown) is provided thereto to detect the temp. distribution of the casting mold and the position of the solidification boundary is adequately controlled in a horizontal and continuous casting method in which the molten metal 6 is supplied to the mold 1 from one side thereof and a casting ingot 5 is drawn out while the ingot is cooled by a cooler 2. The casting ingot 5 having good quality is thus cast and the prior detection of the abnormality which may arise is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to horizontal continuous casting of metal in which a part or all of the upper surface of the mold is opened, a full melting force is supplied from one side of the heating mold passing through the mold, and an ingot is pulled out from the other side. Conventionally, the horizontal continuous casting method uses a cooling mold with a central hole through which the molten metal is supplied from one side of the mold, solidifies the molten metal in the mold, and then pours the ingot horizontally from the other end. This is a method of continuously drawing out metals, and it is widely used for manufacturing ferrous and non-ferrous pedestals b3 because the device can be made smaller. in this way.

The injected molten metal is rapidly cooled within the mold and begins to solidify at the contact area with the cooled mold, but the inside remains unsolidified. This unsolidified part is retained by the solidified shell and becomes rotten! In the conventional continuous casting method described above, solidification begins from the outside of the ingot, and finally the center As the part solidifies, dendrites whose solidified structure is perpendicular to the casting direction are formed.

In addition, impurities etc. are concentrated in the center, causing component segregation,
In addition, defects such as blowholes occur in the center, so the dendrites are destroyed using electromagnetic stirring in the mold or during the ingot drawing process.

Efforts have been made to homogenize the ingredients, but it is not sufficient.
In order to prevent the casting metal from sticking to the mold and from leaking, the ingot is withdrawn intermittently, but the oscillation marks formed by this can cause cracks, and Surface defects are likely to occur on the surface of the lump due to friction with the mold, and surface care such as removing scratches and shaving the surface is required. It has also been proposed to heat the mold above the solidification temperature of the entire casting area so that a surface layer of the ingot is formed near the exit of the mold. In this method, the inside and outside of the ingot progress almost simultaneously, so internal defects such as segregation are reduced, a unidirectional solidification structure in the casting direction can be obtained, and the surface condition is extremely smooth. . Furthermore, since there is no need for vibration of the mold or intermittent withdrawal of the ingot, the ingot with the unidirectional solidification structure as described above has an extremely excellent property of not forming oscillation marks.

It is suitable for materials that are difficult to process because it has excellent workability such as rolling.

However, although the continuous casting method in which the mold is heated in this way has many advantages as mentioned above, since a surface layer is formed on the ingot near the exit of the mold, the temperature of the molten metal supplied to the mold The solidification start position (solidification interface) fluctuates due to changes in pressure, temperature distribution of the heated mold, changes in drawing speed, cooling capacity of the ingot, etc., and in some cases, leakage may occur at the mold outlet end. may break.

In particular, when an ingot becomes large or an ingot with a complicated cross-sectional shape is manufactured, the risk of abnormalities occurring increases.

Therefore, it is extremely important for operation to constantly detect the start of solidification of the ingot in the mold, perform steady and smooth casting, and at the same time detect abnormalities in advance. .

The present invention has been made in view of this point.

In a horizontal continuous casting method for metal, in which molten metal is supplied from one side of a heated mold that is partially or completely open and the upper surface of the mold is opened, and an ingot is drawn from the other side.

A horizontal continuous metal casting method in which the temperature distribution of the molten metal in the open part of the mold or the temperature distribution of the mold is detected to control the position of the solidification interface of the cast metal, and the amount of infrared rays emitted from the molten metal according to the temperature distribution of the molten metal. The present invention relates to the horizontal continuous casting method, in which the temperature distribution of the mold is measured and detected, and the temperature distribution of the mold is detected using a plurality of thermocouples.

As a result, when the position of the solidification interface changes, it is possible to automatically and steadily perform continuous casting by adjusting the drawing speed, ingot cooling capacity, molten metal temperature, mold heating temperature, etc. Well, even if an abnormal situation occurs, it is possible to detect it in advance. Imaji 11 Uranfuyu Right Imaji Next, I will explain according to the drawing. Figure 1 is a vertical cross-sectional front view of a horizontal continuous casting device that heats an open mold so that solidification starts near the mold outlet, and a non-contact temperature sensor such as an infrared quantity meter that constantly detects the solidification interface. It is.

The molten metal 6 in the holding furnace 3 is heated by the heating element 4 into the mold 1.
The ingot 5 solidifies from the inside, and the ingot 5 solidifies near the exit of the mold 1.
The surface layer of is solidified. The ingot 5 is drawn out in the right direction in FIG. 1, and heat is removed from the ingot 5 by spraying cooling water through a cooling nozzle in the cooling device 2.

The cooling means can be air cooling, indirect cooling by box cooling, or cooled pinch roll fathom.

According to such a casting method, it is possible to obtain an ingot with a smooth surface layer that is highly workable and has few internal defects as described above.

However, since the ingot surface layer is formed near the mold outlet, the temperature and pressure of the molten metal supplied to the mold as described above,
The position of the solidification interface is always determined by changing the temperature distribution of the heating mold, the drawing speed, the cooling of the ingot after leaving the mold, etc. Understand the fluctuations of the solidification interface, pull-out speed, and temperature of the mold.

To control the above conditions such as cooling of the ingot.

A non-contact temperature sensor, an infrared radiation temperature change needle 7, etc. are installed on the upper surface near the mold outlet to detect the solidification interface and control the casting conditions. This eliminates the risk of hot water leakage and enables smooth operation.The above can also be achieved by continuously measuring the temperature distribution of the top-open mold, the partially open mold, and the non-open mold. Wow. FIG. 2 is a top view of a horizontal continuous casting apparatus in which a thermocouple is installed near the outlet of the mold. The molten metal salt layer decreases toward the mold exit, and the molten metal reaches the solidification temperature at the mold exit.

Therefore, a thermocouple 8 was installed inside the mold near the mold outlet, and the temperature distribution near the mold outlet was continuously measured.

Changes in the solidification interface are detected, and if an abnormality occurs, the casting conditions are controlled to maintain normal casting conditions.

As described above, the casting method of the present invention not only makes it possible to obtain a high-quality ingot without the risk of water leakage, etc., but also enables unmanned operation.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a horizontal continuous casting apparatus for explaining in detail the present invention, which detects the interface between a molten part and a solidified part from above an open mold by a non-contact method. FIG. 2 is a top view of a horizontal continuous casting apparatus illustrating in detail the present invention, which detects the interface between a molten part and a solidified part of a multimetal based on the temperature distribution of a mold. 1... Heating mold, 2... Cooling device, 3. Bending/holding furnace 4... Heating element, 5...
... Ingot, 6... Molten metal 7...
Non-contact temperature sensor, 8... Thermocouple patent applicant Nippon Mining Co., Ltd. Agent Patent attorney (7569) Keishi Namiyo No. 1R Figure 2

Claims (1)

[Scope of Claims] (Li) In a horizontal continuous metal casting method in which molten metal is supplied from one side of a penetrating heating mold with the upper surface of the mold partially or entirely open and an ingot is drawn from the other side, the mold is opened. A horizontal continuous casting method for metals in which the position of the solidification interface at full casting bend is controlled by detecting the temperature distribution of the molten metal in the open part of the mold or the temperature distribution of the mold. (2) Measurement of the amount of infrared rays emitted from the molten metal in the open part of the mold. 9. The horizontal continuous casting method according to claim 1, wherein the temperature distribution of the molten metal is detected. Horizontal continuous casting method as described in section.