High-strength automobile steering knuckle and preparation method thereof

An automobile steering knuckle, high-strength technology, applied in the field of auto parts, can solve the problems of complex production process and high production cost

Inactive Publication Date: 2017-10-03

WUHU CHENGTUO AUTO PARTS

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AI-Extracted Technical Summary

Problems solved by technology

[0003] At present, the production process of high-strength automobile steering knuckle is complicated and the production cost is high....

Abstract

The invention discloses a high-strength automobile steering knuckle and a preparation method thereof. The preparation method is characterized in that pig iron, silicon carbide particles, graphite fiber, manganese, nickel, chromium, ceria and titanium oxide are mixed and then are smelted; then refining is carried out and thus molten iron is obtained, and the molten iron is subjected to casting moulding subsequently and thus a moulded blank is obtained; finally the moulded blank is subjected to heat treatment and thus the high-strength automobile steering knuckle is prepared; and with respect to 100 parts by weight of pig iron, the use amount of silicon carbide is 0.5-0.8 part by weight, the use amount of graphite fiber is 1.5-2.5 parts by weight, the use amount of manganese is 0.6-1.5 parts by weight, the use amount of nickel is 0.1-0.5 part by weight, the use amount of chromium is 0.3-0.6 part by weight, the use amount of ceria is 0.1-0.5 part by weight, and the use amount of titanium oxide is 0.05-0.1 part by weight. The high-strength automobile steering knuckle has the advantages of high tensile strength, high yield strength, high elongation percentage, good shock resistance and the like.

Application Domain

Steering linkagesFurnace types +1

Technology Topic

Titanium oxideHigh intensity +11

Image

Examples

Experimental program(4)
Comparison scheme(5)
Effect test(1)

Example Embodiment

[0014] In the preparation process of the above inoculant, the particle size of each raw material used can be selected in a wide range, but in order to further improve the performance of the inoculant prepared to increase the strength of the high-strength automobile steering knuckle prepared, it is preferred Preferably, the particle size of the silicon barium, ferrochrome, titanium oxide, ferromanganese, and calcium oxide after crushing is 1-5 mm.

[0015] In the present invention, the temperature and time during the smelting process can be selected in a wide range, but in order to further improve the strength of the manufactured high-strength automobile steering knuckle, preferably, the smelting temperature is 1500-1550°C. The time is 1-2h.

[0016] In the present invention, the heat treatment conditions can be selected within a wide range, but in order to further improve the strength of the manufactured high-strength automobile steering knuckle, preferably, the heat treatment conditions are: Keep the temperature at 900-950°C for 3-5 hours, then lower the temperature to 500-550°C at a rate of 10°C/min and keep it for 5-6 hours, and then directly water-cool after the heat preservation to obtain the high-strength automobile steering knuckle.

[0017] In addition, in order to further prevent the sudden change of the heat treatment temperature from reducing the strength of the parison, preferably, the temperature of the parison is 950-970°C before the heat treatment.

[0018] In the present invention, the refining conditions can be controlled in a wide range, but in order to further improve the strength of the manufactured high-strength automobile steering knuckle, preferably, the refining conditions are: the refining temperature is 1450-1650°C, and the refining The time is 45-60min.

[0019] The invention also provides a high-strength automobile steering knuckle prepared by the above preparation method.

Example Embodiment

[0021] Example 1

[0022] First, the weight ratio of pig iron, silicon carbide particles, and graphite fiber was mixed and then smelted at 1500°C for 1 hour; then an inoculant with a weight ratio of 0.5:100 to pig iron was added for refining at 1450°C for 45 minutes to obtain molten iron. Molten molten iron is cast to obtain a parison (temperature is 950℃); the final parison is first kept at 900℃ for 3h, and then cooled to 500℃ at a rate of 10℃/min for 5h. Direct water cooling, that is, the high-strength automobile steering knuckle is made, which is recorded as A1;

[0023] Among them, the preparation process of the inoculant is as follows: silicon barium, ferrochrome, titanium oxide, ferromanganese and calcium oxide are crushed and mixed according to the weight ratio of 1:0.3:0.3:0.1:0.01, and then calcined at 450°C for 2h, The inoculant is prepared after natural cooling; the used silicon barium, ferrochromium, titanium oxide, ferromanganese and calcium oxide have a particle size of 2mm after being broken.

Example Embodiment

[0024] Example 2

[0025] First, pig iron, silicon carbide particles, graphite fibers, manganese, nickel, chromium, ceria and titanium oxide are mixed in a weight ratio of 0.6:2.0:1.2:0.3:0.5:0.3:0.08 at 100:, and then carried out at 1520℃ Smelt for 1.5h; then add an inoculant with a weight ratio of 0.7:100 to the pig iron and refine it at 1550°C for 50 minutes to obtain molten iron, then cast the molten iron to form a parison (temperature 960°C); the final parison is first Heat the preform at 930°C for 4 hours, then cool it down to 520°C at a rate of 10°C/min for 6 hours, and finally water-cool it directly after the heat preservation, to obtain the high-strength automobile steering knuckle, denoted as A2;

[0026] Among them, the preparation process of the inoculant is as follows: silicon barium, ferrochrome, titanium oxide, ferromanganese, and calcium oxide are crushed and mixed according to the weight ratio of 1:0.4:0.4:0.2:0.03, and then calcined at 500°C for 3h, The inoculant is prepared after natural cooling; the used silicon barium, ferrochrome, titanium oxide, ferromanganese and calcium oxide have a particle size of 3 mm after being broken.

PUM

Property	Measurement	Unit
Size	2.0	mm
Size	3.0	mm
Size	5.0	mm

Description & Claims & Application Information

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