Multi-overlaid-layer gating system and technology for casting

Abstract

The invention discloses a multi-overlaid-layer gating system and technology for casting. The multi-overlaid-layer gating system is characterized in that the multi-overlaid-layer gating system comprises multiple layers which are overlaid, riser channels and spures are arranged in the gating system, and in each layer of the gating system, the upper end and the lower end of the riser channel and the upper end and the lower end of the spure are provided with risers and pouring gates respectively; a riser cup and a pouring gate cup are fastened to the riser and the pouring gate on the top layer of the gating system respectively; the riser and the pouring gate of the upper end of the next layer of the gating system are tightly sleeved with the riser and the pouring gate of the lower end of each upper layer of the gating system respectively; the riser and the pouring gate of the bottom layer of the gating system are sealed, cross gates are arranged between the riser channels and the spures, inner pouring gates are arranged on one sides inside the riser channels, the cross gates are communicated with the inner pouring gates, and the inner pouring gates are communicated with a product sand mold cavity. By means of the multi-overlaid-layer gating system, a multi-layer product sand mold cavity is cast, casting production efficiency is improved, casting time is shortened, the molten iron content in multi-overlaid-layer casting is guaranteed, temperature balance is guaranteed, and casting product quality is guaranteed.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a casting multi-layer pouring system and technology. Background technique [0002] The casting process can be divided into gravity casting, pressure casting and sand casting. Sand molds generally adopt gravity casting, and low-pressure casting, centrifugal casting and other processes can also be used when there are special requirements. Sand casting has a wide range of adaptability. There are wooden molds for sand casting. In addition to single-piece sand castings, aluminum alloy molds or resin molds with high dimensional accuracy and long service life can be used. Although the price has increased, it is still much cheaper than molds for metal casting, especially in small batch and large-scale production. In addition, sand molds have higher refractoriness than metal molds, so materials with higher melting points such as copper alloys and ferrous metals also use this process. ...

AI Technical Summary

Problems solved by technology

[0003] In traditional sand casting, generally each sand mold can only be poured once, and the sand mold casts a casting product, and the mold will be damaged after the casting is obtained; single casting casting, in the mass production of castings, occupies a large area, sand casting The production efficiency is low, and a casting requires an upper mold, a lower mold, and even a middle mold, which shows that the casting process is inefficient and wastes resources

[0004] For this reason, it is necessary to improve the sand casting process. People study the process of overlapping casting molds to obtain higher casting production efficiency. In the stacking casting process of castings, molten iron is pouring from top to bottom Pouring the lower layer of molten iron first, and pouring the upper layer in turn, will cause the composition and temperature of the molten iron to be uneven, and the shrinkage will be uneven, especially when pouring large castings, the fluidity of the molten iron is large More obviously, there are also quality defects such as pores, shrinkage cavities, slag inclusions, and cold shuts due to pressure differences, which seriously affect the quality of castings, make the dimensional accuracy of castings seriously inaccurate, and affect the yield of castings; at the same time, it is still inevitable to use the bottom mold , cover mold, etc., waste of resources, cumbersome process

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