Preparation method for niobium-containing cast iron-based motor shell
A motor casing and cast iron technology, which is applied in the field of preparation of niobium-containing cast iron-based motor casings, can solve problems such as motor failure to continue normal operation, burnout of motor components, and continuous heat accumulation, so as to achieve uniform chemical composition and improve Casting plasticity, effect of improving casting fluidity
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[0026] A method for preparing a niobium-containing cast iron-based motor casing, comprising the following steps:
[0027] (1) Add pig iron to the smelting furnace for smelting to obtain molten iron, and keep it warm for 4-6 minutes;
[0028] (2) Add ferrosilicon, carbon steel scrap, ferromanganese, and copper to the smelting furnace in step (1) in sequence, adjust the temperature of molten iron to 1550-1580°C, keep it warm for 6-8min, and then lower the temperature to 1490-1500°C , and then add ferromolybdenum and ferroniobium in turn, keep warm for 4-6min to obtain composite molten iron, by adding a certain amount of ferrosilicon and ferro-silicone compounding effect, on the one hand, it reduces cementite, pearlite, and ternary phosphorus eutectic , ferrite increases, thus reducing the strength and hardness, and improving the plasticity of castings; on the other hand, silicon solid solution strengthens ferrite, which increases the yield point and hardness. By adding a certain...
Embodiment 1
[0045] The method for preparing a niobium-containing cast iron-based motor housing of the present application includes the following steps:
[0046] (1) Add pig iron to the smelting furnace for smelting to obtain molten iron. The pig iron smelting temperature is 1510°C and kept for 4 minutes;
[0047](2) Add ferrosilicon, carbon steel scrap, ferromanganese, and copper to the smelting furnace in step (1) in sequence, adjust the temperature of molten iron to 1550°C, keep it warm for 6 minutes, and then lower the temperature to 1490°C. The amount of ferrosilicon added is 1.2% of the mass of pig iron; the added amount of carbon steel scrap is 1% of the mass of pig iron; the added amount of ferromanganese is 0.6% of the mass of pig iron, then add ferromolybdenum and ferroniobium successively, keep warm for 4min, ferromolybdenum and ferroniobium The molybdenum / niobium ratio is 2, and the ferromolybdenum addition is 0.5% of the pig iron mass to obtain composite molten iron;
[0048]...
Embodiment 2
[0055] The method for preparing a niobium-containing cast iron-based motor housing of the present application includes the following steps:
[0056] (1) Add pig iron to the smelting furnace for smelting to obtain molten iron. The pig iron smelting temperature is 1530°C and kept for 6 minutes;
[0057] (2) Add ferrosilicon, carbon steel scrap, ferromanganese, and copper to the smelting furnace in step (1) in sequence, adjust the temperature of molten iron to 1580°C, keep it warm for 8 minutes, and then lower the temperature to 1500°C, and the amount of ferrosilicon added is 1.6% of the mass of pig iron; the added amount of carbon steel scrap is 1.5% of the mass of pig iron; the added amount of ferromanganese is 0.8% of the mass of pig iron; The molybdenum / niobium ratio is 3, and the ferromolybdenum addition is 0.6% of the pig iron mass to obtain composite molten iron;
[0058] (3) The spheroidizing treatment is carried out using a dam-type nodular iron ladle, and an inoculant ...
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