Gas blowing plug and manufacturing method therefor
AssigneeTokyo Yogyo Kabushiki Kaisha
InventorsKeizo Aramaki, Tsuyoshi Yoshida
Life of this patent
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Abstract
A gas blowing plug and a manufacturing method therefor wherein the gas blowing plug includes a slit-shaped gas passage (22) ranging from the bottom to the top of the plug. The gas passage (22) is continuous or discontinuous in a horizontal cross section of the plug. The slit-shaped gas passage (22) is also continuous from the bottom to the top of the plug and slit-shaped gas passage (26) is discontinuous in a vertical cross section of the plug. In one example, the cross-sectional shape of the slit-shaped gas passage (22) is a pointed star.
Claims29
A gas blowing plug for blowing gas from the bottom of a molten metal vessel, said gas blowing plug having a top end and a bottom end that is oppositely disposed from the top end, said gas blowing plug comprising:
- a slit-shaped gas passage that extends from the bottom to the top of said plug, the intersection of said slit-shaped gas passage and a horizontal cross section of said plug defining a continuous slit-shaped passage,
- said slit-shaped gas passage forming a continuous passage between the bottom and the top of said plug;
- and
- said slit-shaped gas passage forming a discontinuous slit-shaped gas passage in the vertical cross section of the plug.
A gas blowing plug for blowing gas from the bottom of a molten metal vessel, said gas blowing plug comprising:
- a slit-shaped gas passage ranging from the bottom to the top of said plug, said slit-shaped gas passage defining a discontinuous slit-shaped gas passage in the horizontal cross section of said plug, said slit-shaped gas passage being continuous from the bottom to the top of said plug in the vertical cross section of the plug ;
- and
- a discontinuous slit-shaped gas passage in the vertical cross section of said plug.
A manufacturing method for a gas blowing plug, said method comprising the steps of:
- (a) preparing a tubular body made of a plane-shaped combustible sheet by forming the plane-shaped combustible sheet into a tubular shape, cutting the combustible sheet at predetermined intervals along the longitudinal axis of the tubular shape, said cuts generally located in a plane that is normal to the longitudinal axis of the tubular shape, and projecting the cut portion from the inside to the outside to form a band-shaped convex portion of said tubular body;
- (b) disposing said tubular body in a mold;
- (c) filling the mold with a monolithic refractory material;
- (d) compressing the monolithic refractory material;
- and
- (e) sintering the compressed, monolithic refractory material to burn the combustible sheet and form a slit-shaped gas passage in the refractory material, where the shape of said slit-shaped gas passage corresponds to the shape of the tubular body that is disposed in the mold.
A gas blowing plug for blowing gas from the bottom of a molten metal vessel, said gas blowing plug having a body of refractory material that defines a top end and a bottom end, said top end and said bottom end being located at positions on a longitudinal axis of said gas blowing plug such that the top end is oppositely disposed on the gas blowing plug body from the bottom end, said refractory material body also defining an internal, continuous gas passage that communicates between the top end and the bottom end of said gas blowing plug, said internal gas passage comprising:
- a first slit-shaped gas passage portion that extends between the bottom end and the top end of said plug wherein the intersection of said first slit-shaped gas passage portion with a plane that is orthogonal to said longitudinal axis defines a continuous slit-shaped passage;
- and
- a second slit-shaped gas passage portion that is in communication with said first slit-shaped gas passage portion, wherein the intersection of said second slit-shaped gas passage portion and a plane that is parallel to said longitudinal axis defines a slit-shaped gas passage that is discontinuous.
Dependencies are inferred from the claim text.