我厂制造的柴油机曲轴系用35CrNi3Mo钢制成,该曲轴在氮化前需进行调质处理。国外及国内有关厂对该型曲轴于奥氏体化后直接淬油,得到马氏体组织。但是因曲轴比较长(约2300mm)而且形状复杂,在直接淬油时很容易产生变形。为此,国外的原工艺规定,当曲轴的淬火弯曲度大于4mm时,则需在专用压床上校正;国内某厂则允许其弯曲度不超过7.5mm。我厂缺 The diesel engine crankshaft made by our factory is made of 35CrNi3Mo steel. The crankshaft needs to be quenched and tempered before nitriding. Foreign and domestic plants on the type of crankshaft after austenitizing direct quenching, martensite. However, due to the crankshaft longer (about 2300mm) and complex shape, it is easy to produce deformation in direct quenching. To this end, the original foreign technology, when the quenching of the crankshaft curvature greater than 4mm, you need to be corrected on a dedicated press; a factory in the country to allow its curvature does not exceed 7.5mm. My factory is missing