Pouring sand mould of arc needles for pasture collection machinery and pouring method

Abstract

The invention provides a pouring sand mould of arc needles for pasture collection machinery and a pouring method. The pouring sand mould includes an upper shell body, a lower shell body and core assemblies; the upper shell body is of an arc structure, and a first straight pouring gate is formed in the arc structure and is communicated with a pouring cup for storing pouring liquid; the lower shellbody is of an arc structure matched with the upper shell body, and a second main pouring gate penetrating through the upper and lower ends of the lower shell body is formed in the portion, corresponding to the first straight pouring gate, of the lower shell body; after the upper shell body and the lower shell body are buckled, at least one first mould cavity is formed, the mould cavities are in arc shapes, the first straight pouring gate and the second straight pouring gate are both communicated with the mould cavities, and after the mould cavities are subjected to pouring, arc needle castingsare formed; the core assemblies are arranged inside the mould cavities and are used for assisting the mould cavities in forming the arc needle castings. According to the pouring sand mould of the arcneedles for the pasture collection machinery and the pouring method, the sand mould is changed into a shell type from an overlapping type; an allowance gate is additionally formed, during pouring, sand consumption is reduced, and the finished product rate is increased.

Description

technical field [0001] The invention relates to the field of handwheel manufacturing, in particular to a pouring sand mold and a pouring method of an arc-shaped needle for pasture collection machinery. Background technique [0002] The coated sand casting process is a kind of resin sand in sand casting. The castings manufactured by the coated sand casting process have the characteristics of small surface roughness, high dimensional accuracy and good quality. [0003] In the prior art, the arc-shaped needle process is a laminated sand mold, that is, both sides of the sand mold are patterns, refer to the attached Figure 1-4 As shown, it is mainly horizontal parting, vertical sand shooting, and the inner arcs of the pattern are placed opposite each other. The middle sprue is divided into two arc-shaped runners, and the two arc-shaped runners follow the inner arcs of the two patterns. The direction, the runner and the casting are connected by four ingates, the ingate is in the ...

AI Technical Summary

Problems solved by technology

[0005] The design of the above-mentioned sprue is to take into account the shape and structure of the arc-shaped needle. If the casting is performed directly from both ends, the casting liquid will flow for a long distance and the temperature difference will be large. When the feeding is performed, the feeding will not be timely, resulting in poor molding of the casting.

[0006] The above-mentioned sand mold design has no principle problems in metal casting, but it can be seen that the size of the sand mold is large, and the ratio of the runner to the casting cavity is large. First, the ratio of sand to iron is large and the amount of raw materials is large. Second, the sand mold size is large. , more energy consumption is required for solidification when making sand molds, and at the same time, it is prone to the problem of unrealistic sand shooting. The third is that the sprue is large in size and wastes a lot

[0007] In the second point of the above problems, the size of the sand mold is large, the pass rate of the sand mold is low, and the defects that are invisible to the naked eye will lead to poor casting quality in the later stage, and the requirements for energy consumption and peripheral equipment are high; in the first point of the above problems Among the three points, the volume of the sprue is large, the waste of casting liquid is large, and the cost is high

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