Product Introduction

FCD700 ductile iron lost wax investment casting

The camshaft is an important component of the automobile engine, which is responsible for controlling the opening and closing time of the intake valve and exhaust valve, which is related to the size and accuracy of the intake and exhaust gas, and directly affects the combustion ratio and energy saving and consumption reduction. Therefore, only the high hardness and wear-resistant camshaft can always ensure that the engine meets the design requirements and improve the performance of the entire engine. In the selection of camshaft production material, ductile iron has become the first choice of most camshaft manufacturers because of its excellent shock absorption, good wear resistance and strength no less than steel. FCD700 ductile iron camshaft is a high strength ductile iron automobile castings produced by Harbin Dongan Automobile Engine Company for its 4G6 series engine. For a long time, the company has adopted the thrust-method process for spheroidization inoculation treatment. Although this process condition can also meet the performance requirements of the camshaft, there have been many problems, such as low spheroidization rate and spheroidization efficiency of the casting The fruit is not stable, sometimes the casting white mouth tendency is larger; Low utilization rate of recharging charge and high production cost; The consumption of spheroidizing agent is large, the amount of residual magnesium in the casting machine fluctuates greatly, and the yield of magnesium is low. Industrial site arc, more smoke, bad working environment, workers labor intensity. In order to solve these problems, stabilize and improve the quality of camshaft products, reduce production costs, and improve the working environment of workers, this paper, based on the theoretical analysis of the production of ductile cast iron by wire feeding technology, verified the rationality and feasibility of the production of FCD700 ductile cast iron camshaft by analyzing the causes of the problems in the production of camshaft by the original punching process Then a scheme of producing FCD700 ductile iron camshaft by using wire feeding technology instead of the original punching process was developed, and an industrial test was carried out. During the test, spectral analysis samples, tensile samples and metallographic samples were collected, and the test data were sorted and analyzed. The industrial test results show that when FCD700 nodular cast iron camshaft is produced by the wire feeding process, the parameters such as spheroidization rate and graphite sphere size grade are better than those of the original punching process, and the mechanical stability of the casting is greatly improved, the spheroidization treatment effect is stable and the reproducibility is good. The wire feeding technology has a small amount of silicon increase in hot metal, can use a large amount of return charge, reduce the production cost, and can flexibly adjust the fluctuation of magnesium residue in the pneumatic casting machine. At the same time, the process of feeding line eliminates the impact of flue gas on the environment and pollution during nodule operation to a large extent, and reduces the labor intensity of workers.

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