Manufacturing method for micro-alloying bearing-cover gray-cast-iron

Abstract

The invention discloses a production method of micro-alloyed gray cast iron for bearing caps. Firstly, the gray cast iron raw material is smelted in an electric furnace to obtain molten iron, and then molybdenum powder, vanadium powder and nano-silicon carbide doped alloy powder are added to the molten iron. The heat of the molten iron melts the doped alloy powder and is absorbed by the gray cast iron molten iron, so that the molten iron is subjected to microalloying treatment, and finally the microalloyed molten iron is poured to obtain the microalloyed bearing cap gray cast iron. The micro-alloyed bearing cover gray cast iron produced by the invention has both good cutting performance and impact resistance toughness, strong fatigue resistance and high durability, and is an excellent material for the bearing cover of an automobile engine.

Description

Technical field

[0001] The invention relates to the technical field of casting, in particular to a production method of microalloyed bearing cap gray cast iron. Background technique

[0002] The main bearing cover of the automobile engine plays the role of fixing the crankshaft and bearing the combustion force and impact load generated in the engine, which directly affects the performance and life of the main engine, and requires high performance. The manufacturing process of the main bearing cap is to cut the blank. In order to reduce the wear of the tool and improve the accuracy of the parts, the material is required to have excellent cutting performance. As a traditional material for the main bearing cover, gray cast iron has good cutting performance and is widely used. However, the strength of gray cast iron is low and cannot withstand high combustion stress. Moreover, the main bearing cover made of gray cast iron is prone to fatigue cracks, which can cause engine failure. ...

Examples

Embodiment Construction

[0016] A production method of microalloyed bearing cap gray cast iron, including the following steps:

[0017] (1) Weigh the raw materials according to their chemical composition and put them in an intermediate frequency induction electric furnace, and heat them until all the raw materials are melted to obtain molten iron;

[0018] (2) Add 0.01 parts by weight of nano silicon carbide into absolute ethanol at a solid-to-liquid weight ratio of 1:40 for ultrasonic dispersion, then mix it with 0.2 parts by weight of molybdenum powder and 0.05 parts by weight of vanadium powder, and dry to obtain doped nano-carbonized Silicon alloy powder;

[0019] (3) Put the alloy powder doped with nano-silicon carbide and the inoculant together in the ladle, then pour the gray cast iron molten iron into the ladle for heat preservation treatment for 5 minutes, and use the heat of the high-temperature molten iron to make the nano-silicon carbide doped The alloy powder is melted and absorbed by the gray ...

Technical field

[0001] The invention relates to the technical field of casting, in particular to a production method of microalloyed bearing cap gray cast iron. Background technique

[0002] The main bearing cover of the automobile engine plays the role of fixing the crankshaft and bearing the combustion force and impact load generated in the engine, which directly affects the performance and life of the main engine, and requires high performance. The manufacturing process of the main bearing cap is to cut the blank. In order to reduce the wear of the tool and improve the accuracy of the parts, the material is required to have excellent cutting performance. As a traditional material for the main bearing cover, gray cast iron has good cutting performance and is widely used. However, the strength of gray cast iron is low and cannot withstand high combustion stress. Moreover, the main bearing cover made of gray cast iron is prone to fatigue cracks, which can cause engine failure. ...

Examples

Embodiment Construction

[0016] A production method of microalloyed bearing cap gray cast iron, including the following steps:

[0017] (1) Weigh the raw materials according to their chemical composition and put them in an intermediate frequency induction electric furnace, and heat them until all the raw materials are melted to obtain molten iron;

[0018] (2) Add 0.01 parts by weight of nano silicon carbide into absolute ethanol at a solid-to-liquid weight ratio of 1:40 for ultrasonic dispersion, then mix it with 0.2 parts by weight of molybdenum powder and 0.05 parts by weight of vanadium powder, and dry to obtain doped nano-carbonized Silicon alloy powder;

[0019] (3) Put the alloy powder doped with nano-silicon carbide and the inoculant together in the ladle, then pour the gray cast iron molten iron into the ladle for heat preservation treatment for 5 minutes, and use the heat of the high-temperature molten iron to make the nano-silicon carbide doped The alloy powder is melted and absorbed by the gray ...