A kind of automobile brake drum and manufacturing method
A technology of automobile braking and manufacturing method, which is applied in the direction of brake drums, etc., can solve the problems of unstable torque during braking of brake pads, unenvironmental production process, short service life, etc., and achieves comfortable braking process without noise and production cost. Low, long service life effect
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Embodiment 1
[0019] a. Smelting: preparing raw materials, made of raw materials with the following weight ratio: C3.00%, Si1.74%, Mn0.49%, V0.1%, W0.25%, Cr0.45%, Co0.7 %, P0.1%, S0.1%, the balance being Fe; the prepared raw materials were smelted at 1520°C to obtain molten iron;
[0020] b. Inoculation: ①The first inoculation: add 0.1% SiZrSr of the weight of the molten iron for the first inoculation, the inoculation time is 8 minutes, wherein the temperature of the furnace when the molten iron is poured into the ladle is 1480°C, and the inoculant is completely melted Later, the molten iron is transferred to the pouring ladle for inoculation with the flow; ② inoculation with the flow: add 0.1% SiZrSr of the weight of the molten iron in the ladle for inoculation with the flow, the incubation time is 8 minutes, and the temperature of the molten iron is 1450°C.
[0021] c. Casting to obtain the brake drum material.
Embodiment 2
[0023] a. Melting: preparing raw materials, made of the following raw materials in weight ratio: C3.24%, Si1.6%, Mn0.45%, V0.05%, W0.1%, Cr0.38%, Co0.4 %, P0.1%, S0.1%, and the balance is Fe; the prepared raw materials are smelted at 1580°C to obtain molten iron;
[0024] b. Inoculation: ①The first inoculation: add 0.2% BaCaSi of the weight of the molten iron for the first inoculation, the inoculation time is 12 minutes, wherein the temperature of the molten iron is 1500°C when the molten iron is poured into the ladle, and the inoculant is completely melted Later, the molten iron is transferred to the pouring ladle for inoculation with the flow; ② inoculation with the flow: add 0.25% BaCaSi of the weight of the molten iron in the ladle for inoculation with the flow. The incubation time is 12 minutes, and the temperature of the molten iron is 1480°C.
[0025] c. Casting to obtain the brake drum material.
Embodiment 3
[0027] a. Melting: preparation of raw materials, made of the following weight ratios: C3.20%, Si1.70%, Mn0.45%, V0.08%, W0.20%, Cr0.40%, Co0.6 %, P0.1%, S0.1%, and the balance is Fe; the prepared raw materials are smelted at 1550°C to obtain molten iron;
[0028] b. Inoculation: ①The first inoculation: add 0.1% SiZrSr of the weight of the molten iron for the first inoculation, the inoculation time is 10 minutes, wherein the temperature of the molten iron is 1485°C when the molten iron is poured into the ladle, and the inoculant is completely melted Later, the molten iron is transferred to the pouring ladle for inoculation with the flow; ② inoculation with the flow: add 0.20% BaCaSi of the weight of the molten iron in the ladle for inoculation with the flow.
[0029] c. Casting to obtain the brake drum material.
[0030] The actual measurement shows that the strength of the product prepared by the invention reaches 250-300Mpa; the hardness of the braking surface reaches 187-25...
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