The foreign advanced level axle warranty period is 1 million to 1.5 million km, while the domestic heavy-duty drive axle has a warranty period of 100,000 km. In addition, the domestic heavy-duty axles have low accuracy and high noise, which has become a major annoyance for heavy-duty truck users, which is far from the international advanced level.
From the point of view of the commercial vehicle supply chain system, the axle manufacturers, like other component manufacturers, are under double pressure from the OEM and the rising prices of raw materials such as steel, oil and coal. In 2008, the procurement cost of the drive axle enterprises increased by 10.7% year-on-year, but the sales price only increased by 1.4%, which could not compensate for the cost pressure of rising raw materials.
Therefore, China's commercial vehicle drive axle manufacturing industry has become an inevitable trend in the development of the industry around improving precision, extending service life, reducing manufacturing costs, vigorously carrying out technological innovation, and creating manufacturing technology with independent intellectual property rights.
I. Technological achievements and progress of independent innovation
Rare earth infiltration technology
There are four factors that have the greatest influence on the bending fatigue life of the transaxle gear; the hardness of the core, the meshing accuracy, the compressive stress of the layer on the core of the gear, and the non-horse structure at the root of the tooth. The use of Cr-Mn-Ti gear steel instead of Cr-Ni-Mo gear steel is the only way to solve the problem of steel procurement cost. According to the price in May 2010, the price of 17CrNiMo6H and 20CrNi2MoH steels imported from abroad and used in China is 13,000-11,000 yuan/t, and the price of Cr-Mn-Ti gear steel with the same quenching capacity is 5000-6000 yuan/t. .
The only disadvantage of Cr-Mn-Ti gear steel is its low resistance to internal oxidation. According to the conventional carburizing process, the non-horse structure of the root portion is 0.03~0.05mm, which does not meet the requirement of ≤0.02mm. The tissue is too high, reducing the compressive stress on the core of the gear surface. Harbin Institute of Technology and Hahuilong Gear Factory cooperated successfully to solve this problem by using the rare earth infiltration process; the non-horse structure of the root portion of the 457 bevel gear was controlled within 0.02 mm, and the steel used was Cr-Mn-Ti. At present, Harbin Institute of Technology's rare earth infiltration technology has obtained national invention patents. This patented technology makes it possible for China to establish its own steel alloying system for Cr-Mn-Ti gears. The non-horse structure of the root of the 457 bridge and the 462 bridge Cr-Mn-Ti steel active bevel gear is shown in Fig. 1, Fig. 2 and Fig. 3.
From the point of view of the commercial vehicle supply chain system, the axle manufacturers, like other component manufacturers, are under double pressure from the OEM and the rising prices of raw materials such as steel, oil and coal. In 2008, the procurement cost of the drive axle enterprises increased by 10.7% year-on-year, but the sales price only increased by 1.4%, which could not compensate for the cost pressure of rising raw materials.
Therefore, China's commercial vehicle drive axle manufacturing industry has become an inevitable trend in the development of the industry around improving precision, extending service life, reducing manufacturing costs, vigorously carrying out technological innovation, and creating manufacturing technology with independent intellectual property rights.
I. Technological achievements and progress of independent innovation
Rare earth infiltration technology
There are four factors that have the greatest influence on the bending fatigue life of the transaxle gear; the hardness of the core, the meshing accuracy, the compressive stress of the layer on the core of the gear, and the non-horse structure at the root of the tooth. The use of Cr-Mn-Ti gear steel instead of Cr-Ni-Mo gear steel is the only way to solve the problem of steel procurement cost. According to the price in May 2010, the price of 17CrNiMo6H and 20CrNi2MoH steels imported from abroad and used in China is 13,000-11,000 yuan/t, and the price of Cr-Mn-Ti gear steel with the same quenching capacity is 5000-6000 yuan/t. .
The only disadvantage of Cr-Mn-Ti gear steel is its low resistance to internal oxidation. According to the conventional carburizing process, the non-horse structure of the root portion is 0.03~0.05mm, which does not meet the requirement of ≤0.02mm. The tissue is too high, reducing the compressive stress on the core of the gear surface. Harbin Institute of Technology and Hahuilong Gear Factory cooperated successfully to solve this problem by using the rare earth infiltration process; the non-horse structure of the root portion of the 457 bevel gear was controlled within 0.02 mm, and the steel used was Cr-Mn-Ti. At present, Harbin Institute of Technology's rare earth infiltration technology has obtained national invention patents. This patented technology makes it possible for China to establish its own steel alloying system for Cr-Mn-Ti gears. The non-horse structure of the root of the 457 bridge and the 462 bridge Cr-Mn-Ti steel active bevel gear is shown in Fig. 1, Fig. 2 and Fig. 3.
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