Integral casting method for middle groove of scraper conveyer

Abstract

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.

Description

technical field [0001] The invention relates to an integral casting method for a middle groove of a scraper conveyor, in particular to low-alloy high-strength cast steel and a sand casting process, and belongs to the field of casting. Background technique [0002] The underground working environment of coal mine machinery and equipment is harsh, and most of them work under the conditions of high speed, heavy load, vibration, impact, and friction. The scraper conveyor is one of the key equipment in the coal mining face. And the parts with the largest consumption, the traditional middle tank is a cast-welded structure, and the main structure is welded by the cast tank side and the middle and bottom plates, in order to solve the problems of non-wear resistance, weld cracking and low life of the traditional cast-welded structure , Some enterprises have developed the integral casting without welding middle part, the integral casting middle groove is made of high-strength wear-res...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a low-alloy high-strength cast steel sand mold casting method for the middle groove of the scraper conveyor, which overcomes the large deformation of the whole casting middle groove of the lost foam process, the low compactness of the casting, and the traditional sand casting. The lack of technology that cannot be popularized in the industry, the traditional sand casting process is adopted, the manufacturing process is simple, the material has high strength and toughness, good wear resistance, can be welded and repaired, and the cost is lower than the middle groove and lost foam of the cast-weld structure Integral cast middle slot

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