Riser cutting method for high-strength steel casting

Abstract

The invention discloses a riser cutting method for a high-strength steel casting. The riser cutting method for the high-strength steel casting comprises the following steps: performing high-temperature mould dismantling, preserving temperature and performing primary cutting, performing high-temperature annealing, preserving temperature and performing secondary cutting, and performing rough cleaning. According to the method, twice cutting is adopted; a natural gas cutting torch is adopted for cutting when the primary cutting is performed; the temperature of a cutting part is high, and the temperature of a steel casting body is low, so that the temperature difference between the cutting part and the surface of the steel casting body is great, and a root part of 50 mm is reserved in the primary cutting to prevent the structure of the steel casting from being influenced by high-temperature cutting; even though part stress cracks are generated by the high-temperature cutting, the stress cracks can exist in the root part and cannot exist in the steel casting body.

Description

technical field [0001] The invention relates to the technical field of steel castings, in particular to a riser cutting method for high-strength steel castings. Background technique [0002] In the prior art, medium-carbon high-strength steel has become the preferred steel type for ring gear products due to its high-strength and high-hardness mechanical properties. [0003] Due to the high carbon and high strength of medium-carbon high-strength steel and serious carbide precipitation, it is easy to cause serious cracks at the root of the riser during the cutting process of the riser during the production process, which affects the performance of the steel casting and increases the repair cost, resulting in serious waste of production cost. [0004] When cutting the risers of such steel castings in the prior art, the cast steel castings are first cooled to room temperature, and then the steel castings are transferred to the riser cutting area for riser cutting. Preheat the s...

AI Technical Summary

Problems solved by technology

[0005] This method needs to cool the cast steel castings to room temperature first, and then preheat the steel castings at room temperature to 450°C. In order to avoid the influence of temperature difference on the structure of steel castings, the process of cooling and heating is a process. Very long and slow process, which not only prolongs the production cycle, but also increases the cost of natural gas in the preheating process

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