Vermicular graphite cast iron manufacturing process for automobile engine

Abstract

The invention discloses a vermicular graphite cast iron manufacturing process for an automobile engine. The vermicular graphite cast iron manufacturing process comprises the following steps that S1, the content of a graphite interference element in the raw molten iron is firstly taken into consideration, so that the adding amount of the vermicularizing agent is greatly influenced, due to the factthat the vermicular elements in the molten iron are added, a part is consumed in chemical reaction, the process is mainly used for removing oxygen and desulfurization, only the creep elements remaining in the cast iron are effective in changing the shape of the graphite, and if in the molten iron is treated, S, O and graphite are extremely low in interference element content, the amount of the consumed vermicularizing agent is small, the production cost is low, so that when the furnace burden is prepared, a pure material with low sulfur and graphite interference element content should be selected, and the use amount of the material returning is not more than 50%. The alloy is high in alloy utilization rate by adopting a wire feeding method, less in additive consumption, low in treatment cost, low in labor cost, safe and reliable in operation, and small in environmental pollution.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a manufacturing process of vermicular graphite cast iron for automobile engines. Background technique [0002] With the continuous improvement of people's requirements for the performance of automobile engines and the rapid development of engine technology, the engine will work under higher cylinder pressure, and the maximum explosive power has gradually increased in recent years. The higher the maximum explosive pressure, the more conducive to improving the performance of the engine. The more it is beneficial to reduce emission pollution and reduce noise, but the higher the combustion pressure, the greater the load on the force generated by the engine, resulting in a decrease in the mechanical properties of the engine, so it is necessary to find a suitable material to manufacture the engine. [0003] In current vermicular graphite cast iron, the vermicularizer and inoculant are ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a vermicular graphite cast iron manufacturing process for automobile engines, which solves the problem that the creep rate of the prior art is low and different batches have different vermicular effects, making it difficult to control the vermicular rate consistency problem