Casting method of tabular spheroidal iron piece and casting system thereof

Abstract

The invention discloses a pouring method and a pouring system used for a plate-shaped ball iron casting. The method adopts a sand casting technique; the pouring system comprises a sprue cup, a sprue, a horizontal runner and a plurality of plate-shaped castings; the method adopts a type that the large plane of the plate-shaped casting is vertically arranged in parallel; the horizontal runner and the plate-shaped casting form a narrow seam edge gate so as to lead the molten steel to flow in along the wall and be stably filled from bottom to top during the pouring process. When the method and the pouring system of the invention are adopted, the molten steel is filled along the wall during the pouring process and the metal is sequentially solidified from bottom to top, thus ensuring the uniformity and consistency of the metallographic structure of the plate-shaped ball iron casting; furthermore, by the narrow seam edge gate, the pouring time is prolonged, the shrinkage compensation effectis provided during the pouring process, furthermore, the slag retaining effect is good and the defects such as slag inclusion, sand inclusion, etc. are avoided; the plate-shaped ball iron casting pouring system of the invention has reasonable and simple structure, saves the metal and has high process yield; furthermore, the pouring system is convenient to be removed; the casting adopts serial pouring, thus having small land occupying and high production efficiency.

Description

technical field [0001] The invention relates to a pouring method, in particular to a pouring method for a plate-shaped ductile iron piece; [0002] The invention also relates to a gating system, in particular to a gating system for plate-shaped ductile iron pieces. Background technique [0003] The gating system is the channel through which the liquid metal in the mold flows into the cavity. The gating system of general iron castings is mainly composed of four parts: sprue cup, sprue, runner and inner runner. A reasonable gating system is very important to ensure the quality of castings. [0004] For plate-shaped ductile iron pieces with a length of 100-300mm, a width of 50-100mm, and a thickness of 5-15mm, although the shape is simple, since the casting is directly used in the as-cast state without heat treatment, the metallographic structure is required to be uniform and free from penetration. Carbon and other inclusions are included to ensure that the mechanical proper...

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Problems solved by technology

The liquid metal fills the mold from bottom to top, which is conducive to the discharge of gas in the cavity. However, the plate-shaped ductile iron part is a thin-walled casting, and the cross-sectional area of ​​the ingate 8 is small, especially during the filling process. The lower part of the casting is constantly entering Surrounded by high-temperature molten metal, the relative temperature of the molten metal filling the upper part 10 of the casting is relatively low, which makes the upper 10 parts of the casting prone to cold shut defects, and the temperature difference between the upper and lower parts is likely to cause differences in the metallographic structure of the casting, resulting in The mechanical properties of the whole casting are not balanced

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