JPH021540U

JPH021540U -

Info

Publication number: JPH021540U
Application number: JP7582688U
Authority: JP
Priority date: 1988-06-09
Filing date: 1988-06-09
Publication date: 1990-01-08

Description

[Brief explanation of drawings]

第１図は本考案の一実施例を示す模式図、第２
図はダミーバーヘツドを示す断面図、第３図は第
２図の端面図、第４図はダミーバーヘツドの鋳型
装置への挿入状態を示す模式図、第５図はダミー
バーヘツドによる鋳造管引抜き状態を示す模式図
である。１０…連続鋳造装置、１１…溶湯保持炉、１２
…鋳込口、１３…鋳型装置、１４…鋳造管、１６
…ダミーバー、１８…ピンチローラー、２０…ダ
ミーバーヘツド、２１…管成形通路、２２…鋳片
抱き込み部。 Figure 1 is a schematic diagram showing one embodiment of the present invention, Figure 2 is a schematic diagram showing an embodiment of the present invention.
Figure 3 is a cross-sectional view of the dummy bar head, Figure 3 is an end view of Figure 2, Figure 4 is a schematic diagram showing how the dummy bar head is inserted into the molding device, and Figure 5 shows how the dummy bar head is pulled out of the cast pipe. FIG. 10... Continuous casting device, 11... Molten metal holding furnace, 12
... Casting port, 13... Mold device, 14... Casting pipe, 16
...Dummy bar, 18...Pinch roller, 20...Dummy bar head, 21...Tube forming passage, 22...Slab holding part.

Claims

[Claims for Utility Model Registration] (1) A dummy bar head is inserted into a mold device installed at the pouring port of a molten metal holding furnace, and the tip of a casting tube solidified and formed in the mold device is connected to the dummy bar head. In a dummy bar for continuous casting of metal tubes, the dummy bar head is secured at a head and the cast tube is pulled out together with the dummy bar head under the pinching force of rotating pinch rollers, and the dummy bar head has a tubular shape that can be inserted into the tube forming passage of the molding device. Continuous casting of a metal tube, characterized in that the head tip is provided with slab holding portions at a plurality of positions on the head tip, which are open at the head tip surface and are formed in a concave shape so as to widen in the axial direction of the head. dummy bar. (2) The shape of the slab holding part is as shown in (1) and (2) below.
The dummy bar for continuous casting of metal tubes according to claim 1, which is formed to satisfy the following formula. D-a>D {1-α(T ₁ - T ₂ )}...(1) Σa>Fp/(Ts・t)...(2) However, a: Opening width of each enclosing part Σa: Each enclosing part D: Maximum internal width of each enclosing part α: Shrinkage rate of the cast metal T ₁ : Freezing point of the cast metal T ₂ : Temperature of the cast pipe when passing through the pinch roller Fp: Pulling force of the pinch roller Ts: Hot strength of the cast metal at the temperature of the enclosing part at the start of drawing t: Wall thickness of the cast pipe.