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目前,汽车发动机凸轮轴毛坯多为圆棒料,材料利用率仅达25%左右,加工工时多,制造成本高,且金属流线被切断,导致强度降低。虽然也有采用球墨铸铁件的,但因凸轮轴属细长杆件,材质又较脆,故未得到广泛应用。模锻虽能改善金属流线,提高了强度,但有飞边。因此,在材料的利用率上与圆棒料相比,也无甚改进。如采用热滚挤压工艺,则材料利用率可达65%,且热滚挤压过程中变形抗力小,成形容易。整个凸轮轴的金属流线不会被
At present, the majority of automotive engine camshaft rough bar material, material utilization rate of only about 25%, the number of processing hours, manufacturing costs are high, and the metal streamline is cut off, resulting in reduced strength. Although there are also ductile iron parts, but the camshaft is an elongated rod, the material is more brittle, it has not been widely used. Although forging can improve metal flow lines, increased strength, but there are burrs. As a result, there is no improvement in material utilization compared to round bars. Such as the use of hot rolling extrusion process, the material utilization up to 65%, and hot rolling extrusion process resistance to deformation, forming easy. The entire camshaft metal flow line will not be