A kind of quick preparation method of vermicular graphite cast iron truck brake disc

Abstract

The invention discloses a rapid preparation method for vermicular graphite cast iron truck brake discs. Lay a layer of ferrosilicon on the bottom to form a ferrosilicon layer, then add the rest of the pig iron to form a pig iron layer, raise the temperature, add electrolytic copper, ferromanganese, and ferrochrome before the added ferrosilicon and pig iron are completely melted; add low-frequency ferrosilicon to the medium-frequency induction furnace The solution in the induction furnace, the medium frequency induction furnace solution is vermigrated in the vermicular ladle; the vermicular agent is a mixture of rare earth silicon magnesium alloy, composite material with calcium element, cut aluminum wire, silicon barium powder and tin powder ;pouring. The invention has the characteristics of fast production speed of the brake disc, good quality of the brake disc and low cost.

Description

technical field [0001] The invention relates to a preparation method of truck brake discs, in particular to a rapid preparation method of vermicular graphite cast iron truck brake discs. Background technique [0002] At present, the materials of truck brake discs produced at home and abroad mainly include ordinary gray cast iron and alloy gray castings. Gray cast iron has a certain hardness, but the physical and mechanical properties, mechanical strength, low temperature resistance and thermal fatigue resistance of gray cast iron brake discs are not satisfactory in the practical process of automobiles, and thermal cracks and rapid wear are prone to occur during use. phenomenon, resulting in certain security risks. [0003] Graphite forms in cast iron are flake, worm and spherical. Vermicular graphite is an intermediate form of graphite between flake graphite and spherical graphite. When observed under an optical microscope, most of the short pieces of graphite are discont...

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Problems solved by technology

[0006] 1. Use an electric furnace to heat and melt the liquid, transfer it to the vermicomposted ladle for vermisification, pour the molten iron into the small ladle and add the inoculant at the same time as it is poured, and then pour it at the end. After the sand box is formed, it will take a long time Waiting for the molten iron to be ready before pouring, the whole process takes a long time, the efficiency is not high, and the energy consumption is relatively high

[0007] 2. As we all know, the quality of the casting model is not considered in the whole process, the surface of the brake disc of the casting truck is not smooth, and the engine block made of vermicular graphite cast iron is difficult to polish, which increases the processing cost

[0008] 3. The high amount of rare earth used in the vermicular agent causes its production cost to be too high, which limits its application in ordinary occasions

[0009] 4. The materials used in the process are pig iron, steel and other materials, which are not suitable for occasions where scrap steel, recycled materials and other raw materials are used

[0010] 5. During vermicularization, the remaining impurities after the reaction of the vermative agent are easy to enter the molten iron, which will have a certain impact on the quality of the pouring, etc.

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