Sand casting fillet is directly related to the internal and external quality of products. At the joint, if the fillet is set unreasonably, it will lead to slow solidification speed and easy to produce defects such as crack, deformation, shrinkage cavity (looseness), sand sticking and so on.
After consulting the selection of sand casting fillet in relevant reference books, according to the wall thickness calculation shown in the figure, the fillet r in the thin-wall area of product k141 is ≥ 8mm, and the fillet r in thick and thin-wall joints is ≥ 15mm. The actual design fillet size of the product is 15mm ≤ R ≤ 40mm. Therefore, the fillet of k141 sand mold casting meets the requirements.
After consulting the selection of sand casting fillet in relevant reference books, the minimum edge size of product k141 surface is less than 60mm, and the fillet needs R ≥ 4mm. The actual design fillet size of the product is 4mm ≤ R ≤ 20mm. Therefore, the fillet of k141 sand mold casting meets the requirements.