The invention relates to an integral
casting method for a middle groove of a scraper conveyer, and belongs to the field of low-
alloy high-strength cast steel sand mould
casting. The integral
casting method comprises the following casting steps that a middle groove casting structure is designed according to the characteristics of the sand mould casting technology, and a bottom plate is provided with a square hole; an anti-deformation tie bar is arranged on the middle plate, after model core setting, a sand mould checking sample plate is used for detecting the size of components, and box combining is conducted after qualification is checked; and a low-
alloy cast steel material with qualified components is smelted, and oblique pouring is conducted. Si and Mn serve as main
alloy elements of the adopted low-alloy and high-strength cast steel material, the content of C is smaller than or equal to 0.35%, the content of Si and Mn is smaller than or equal to 2.5%, a trace of B, Ti, Nb and otherelements are added, the carbon equivalent CE is smaller than or equal to 0.68%,
welding and repairing can be conducted, the material is subjected to normalizing,
quenching and low-temperature
tempering heat treatment, and after normalizing, the anti-deformation tie bar on the middle plate is removed. According to the material performance, the tensile strength Rm is larger than or equal to 1,300 MP, the
impact toughness KV2 is larger than or equal to 25J, and the abrasion resistance is superior to that of an imported abrasion resisting plate Hardox400. The sand mould casting technology solvesthe problem that an
evanescent mode technology is adopted at present to integrally cast a middle groove casting, deformation is large, and density is low; and the production technology is relatively simple, materials can be welded and repaired, and the integral manufacturing cost of the middle groove is reduced.