Process for producing thin metallic strip by continuous casting

Details Process for producing thin metallic strip by continuous casting Process for producing thin metallic strip by continuous casting

1993-09-14

1995-02-21

Lin, Kuang Y.

Metal founding

Process

Shaping liquid metal against a forming surface

164480, B22D 1104, B22D 1106

Patent

active

053907264

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

Technical Field
The present invention relates to a process for producing a thin metallic strip by continuous casting in a twin drum system and particularly to a method of vibrating a side gate constituting a pouring basin portion.
Background Art
A conventional continuous casting process using a twin drum system comprises forming a pouring basin portion for a molten metal comprising a pair of rotary cooling drums respectively having shafts parallel to each other and a pair of side gates respectively in contact with the end face of the cooling drums, solidifying the molten metal poured into the pouring basin at a stage leading to the kissing point while cooling the molten metal by means of the cooling drums, thereby forming a thin cast strip, and pulling the cast strip downward.
In casting a thin strip by the above-described process, a gap often occurs between the end face of the cooling drum and the side gate in press contact with the end face of the cooling drum. In this case, the molten metal enters the gap, or solidified matter adheres to the surface of the side gates and grows, so that it frequently becomes difficult to conduct casting due to the breaking of a solidified shell or entrainment on the cooling drum attributable to the formation of casting fins.
In order to solve this problem, Japanese Unexamined Patent Publication (Kokai) No. 60-166146 discloses a method of vibrating the side gates in the horizontal direction.
Since, however, the object of the technique disclosed in the above-described document is to remove solidified matter solidified and grown on the surface of the side gates, the proper range of reciprocating movement of the side gates in the horizontal direction is as follows.
1 cycle: 0.25 to 5.0 sec
degree of movement in each direction, from rest position: 5 to 20 mm Specifically, the amplitude of the said gate vibration is in the range of from 10 to 40 mm, and the number of vibrations per se (frequency) is in the range of from 5 to 0.2 Hz. That is, the above-described technique is characterized in that the vibration is conducted slowly but with a large amplitude.
The present inventors have conducted various studies on the above-described technique and, as a result, have found that although such means is effective in preventing the formation of casting fin, a delay of solidification of the molten metal occurs at the end portion of the cooling drum to form a porosity and a large secondary casting fin.
Specifically, when the amplitude of the side gate becomes large, a shell which is growing on the cooling surface of the drum is unfavorably floated from the cooling drum by shearing stress, which delays the development of the shell, so that there occurs a delay in solidification.
An object of the present invention is to remove solidified matter formed on the side gates and to prevent the delay of solidification at the end portion of the cooling drum.


SUMMARY OF THE INVENTION

In order to attain the above-described object, the present invention has the following constitution. Specifically, the present invention is directed to a process for producing a thin metallic strip by continuous casting, comprising forming a pouring basin portion for a molten metal between a pair of rotary cooling drums respectively having shafts parallel to each other and a pair of side gates in contact with the end face of said cooling drums and pouring said molten metal into said pouring basin portion for a molten metal to continuously cast a thin strip, characterized in that a side gate frequency, f (Hz), is determined according to the following formula (1) using the initial numerical value (in the range of from 0.5 to 5 mm) of a side gate amplitude, A, at a kissing point of said pouring basin portion for a molten metal and the numerical value of the casting rate, V (m/min), previously determined from a target sheet thickness of a cast strip and casting is conducted while vibrating said side gates at the determined frequency, f, at an amplitude, A: occurrence of casting fin and the delay of solidif

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