A heavy-duty sprocket and its manufacturing method

Abstract

The invention discloses a heavy chain wheel and a manufacturing method thereof. The heavy chain wheel comprises the following components in parts by mass: 0.3-0.6 part of carbon, 0.4-0.5 part of silicon, 0.6-0.7 part of manganese, 95-98 parts of iron, 0.2-0.3 part of titanium, 0.25-0.35 part of vanadium, 0.03-0.04 part of molybdenum, 0.1-0.2 part of chromium, 0.05-0.06 part of niobium, 0.02-0.03 part of copper, 0.1-0.2 part of sulfur, 0.04-0.05 part of phosphorus, 0.2-0.3 part of aluminum and 0.06-0.08 part of boron. The manufacturing method comprises the following steps: selecting a semi-closed pouring system, arranging equal-altitude insulated feeders on the tooth surface around a casting and at the center of a chain wheel casting, arranging runner gates at the bottoms of the equal-altitude insulated feeders, and adding chiller to the bottom of the casting; when the pouring temperature reaches 1,780 DEG C, enabling sand shakeout of the chain wheel; after the sand is solidified, cutting the casting head and the equal-altitude insulated feeders, performing normalizing and tempering treatment, and finally performing rough machining; processing the chain wheel blank after the rough machining with a cooling device so that the chain wheel blank experiences phase-change hardening in gas quenching; annealing and performing polishing treatment and inner bore honing.

Description

technical field [0001] The invention relates to a heavy-duty sprocket and a manufacturing method thereof. Background technique [0002] Heavy machinery transportation mainly relies on the sprocket to drive the movement of the circular chain, thereby driving the material transportation, and the sprocket wears faster than the circular chain. Therefore, the sprocket is the main component, and the durability of the sprocket determines the quality of heavy machinery. The volume and weight of the sprocket are large, and it belongs to the small batch production of a single piece. Its quality requirements are high, and the working surface and the casting body must not have shrinkage cavities and shrinkage porosity. In the traditional sprocket manufacturing process, shrinkage cavity, shrinkage porosity and segregation are more serious, and the free surface at the end of the shrinkage cavity leaves wrinkle marks due to the shrinkage surface, which is easy to form stress concentration...

AI Technical Summary

Problems solved by technology

In the past, the production was mainly carried out based on the accumulated experience and the proficiency of the workers. In order to ensure the quality of the castings, a conservative process was adopted, which wasted a lot of metal.

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