Reforming method and mold of automobile rear axle driven gear forging piece

Abstract

The invention relates to a reforming method and a mold of an automobile rear axle driven gear forging piece; the method comprises the following steps: prepare a semi-finished product-a chambering piece of the driven gear forging piece, place the manufactured chambering piece into a reforming mold cavity and reform the driven gear forging piece; the mold comprises a male mold, a female mold and a stripper plate, wherein the female mold is composed of a floating mold and a closed cavity formed by a pair of rollers; the invention can effectively reform the chambering piece of the driven gear, eliminate the disadvantages of concave pit, oval shape and distortion of the surface of the chambering piece, adopt equipment with low load and simple structure can effectively reform the driven gear forging piece of the automobile rear axle and saves more than 10 percent of raw material; for instance, the driven gear forging piece with 430mm of outer diameter is reformed, the needed load is 6300kN and the blanking weight is 36 kilograms.

Description

technical field [0001] The invention relates to a method and a mold capable of shaping the reamed automobile rear axle driven gear blank, which can eliminate surface pits of the blank reamed by a reaming machine, and can effectively improve the blank roundness and flatness. Background technique [0002] The driven gear of the automobile rear axle is one of the key parts for the power transmission of the automobile rear axle main gearbox, see figure 1 , and its forgings are ring forgings. At present, the main production process is: upsetting → punching → piercing → flattening → reaming. The defects of the forging after reaming include: (1) pits on the end surface; (2) large ovality ( ≥1mm); (3) distortion. Therefore, the unilateral machining allowance of the forging design is 2.5-4mm, and the material consumption is relatively large. [0003] In order to improve the utilization rate of materials, the methods adopted at present are: (1) use a press to shape it after reamin...

AI Technical Summary

Problems solved by technology

At present, the main production process is: upsetting → punching → piercing → flattening → reaming. The defects of the forging after reaming include: (1) pits on the end surface; (2) large ovality ( ≥1mm); (3) distortion

The first method requires a large tonnage of equipment for shaping (more than 2,000 tons of presses), and the cost of the equipment is high, and it cannot effectively eliminate the ellipticity of the forging; the second method is the local cumulative deformation of the metal, and the required equipment tonnage is the first. 1 / 5 to 1 / 15 of that, which can effectively eliminate the defects of the blank after reaming. However, the rolling force is an eccentric load, which requires the equipment to withstand the eccentric load. The requirements for the equipment structure are high, and the equipment cost is high. Moreover, Oscillating roller shaping is thermal shaping (the temperature of the blank is above 900°C), the life of the oscillating ball chain is relatively low, and the cost of equipment maintenance is relatively high.

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