Rapid preparation method of truck vermicular graphite cast iron brake disc

Abstract

The invention discloses a rapid preparation method of a truck vermicular graphite cast iron brake disc. The method comprises the following steps of preparing materials, adding part of pig iron, all scrap steel and all foundry returns into a low-frequency induction furnace for melting, and adding a carburant and a nickel plate; laying a layer of silicon iron on the bottom of a medium-frequency induction furnace to form a silicon iron layer, adding the rest pig iron to form a pig iron layer, heating, and adding electrolytic copper, ferromanganese and ferrochromium before the added silicon iron and pig iron are not completely molten; adding a solution in the low-frequency induction furnace into the medium-frequency induction furnace, wherein the solution in the medium-frequency induction furnace is vermicularized in the vermicularizing casting ladle, and a vermiculizer is a mixture of rare earth silicon-magnesium alloy, a composite material with added calcium element, aluminum wires cut into sections, silicon-barium powder and tin powder; and pouring. The method has the advantages of being high in brake disc production speed, good in brake disc quality and low in 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 vermicomposting, then pour the molten iron into the small ladle and add the flow inoculant at the same time, and finally pour it. After the sand box is formed, it takes 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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