Part blank natural splitting process

Abstract

The invention discloses a part blank natural splitting process. The part blank natural splitting process comprises the steps that magnesium foil is machined into sheets at first, the sheets are placedinto a mold according to preset splitting positions and fixed, and the mold is divided into two cavities; secondly, the mold is preheated, metal liquid is molten into two liquid streams, and the twoliquid streams flow into the two cavities separately; after the metal liquid is cooled, a casting is taken out of the mold, and surface cleaning work is conducted; then an expansion fracture hole is formed in the preset splitting position of the casting, and a splitting groove is formed in the intersection of the expansion fracture hole and a splitting interface designed in advance; and finally the casting is subjected to expansion fracture at the expansion fracture hole. By means of the part blank natural splitting process, parts are subjected to brittle fracture and parting along the presetinterface in the splitting process, the effect that two fractured surfaces have excellent engagement and strength is ensured, a positioning basis is provided for subsequent reassembly of parted portions, the material limitation of a splitting technology is broken through, a practical technology is provided, and great economic benefits are achieved.

Description

technical field [0001] The invention relates to a process for accelerating cracking and improving cracking quality, in particular to a natural cracking process for parts blanks. Background technique [0002] Cracking technology is the most advanced high-precision machining technology for manufacturing dissected parts, and it has been widely used in the fields of engine connecting rods, crankcase end covers, etc. Cracking technology has strict requirements on material selection. On the premise of ensuring the comprehensive mechanical properties of the connecting rod, the toughness index of the connecting rod is limited, and the material used is required to have brittle fracture characteristics at room temperature, and the formed fracture surface must have sufficient strength. The available pyrolysis materials are greatly limited. At present, the types of cracking materials that can be used in engineering are relatively limited. The selection of cracking connecting rods is co...

AI Technical Summary

Problems solved by technology

Cracking technology has strict requirements on material selection. On the premise of ensuring the comprehensive mechanical properties of the connecting rod, the toughness index of the connecting rod is limited, and the material used is required to have brittle fracture characteristics at room temperature, and the formed fracture surface must have sufficient strength. The available pyrolysis materials are greatly limited

At present, the types of cracking materials that can be used in engineering are relatively limited. The selection of cracking connecting rods is concentrated on high-carbon steel, powder metallurgy materials, malleable cast iron, etc., while ordinary steel, aluminum alloy, titanium alloy and other tough materials are generally not applicable. cracking technology

At this stage, the mature pyrolysis material preparation technology is complicated and the material composition control requirements are high, which directly restricts the application and promotion of pyrolysis technology

On the other hand, there are many problems in the cracking process of commonly used cracking materials: such as cracking deformation, cracking surface dislocation, cracking surface offset, bifurcation, unilateral tearing, bursting, etc.

In response to this "bottleneck" problem, domestic and foreign explorations on microalloying to improve material properties, development of new pyrolysis equipment, and optimization of pyrolysis parameters have failed to break through the limitations of pyrolysis technology on material selection.

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