①形状复杂的易变形工件,可采用空气预冷或降温预冷后再淬入冷却剂。②轴类工件应垂直淬入冷却剂。③长板状工件应横向侧面淬入冷却剂。④套筒和薄壁圆环状工件,应沿轴向淬入冷却剂。⑤截面相差很大的工件,应将截面大的部分先淬入冷却剂。⑥有凹面的工件应将凹面向上淬入冷却剂。⑦单面有长槽工件,槽口向上,倾斜45度淬入冷却剂。 ① complex shape of the deformation of the workpiece can be pre-cooled air cooling or cooling and then quenching into the coolant. ② shaft workpiece should be vertical quenching coolant. ③ long plate-shaped workpiece should be lateral quenching coolant. ④ Sleeve and thin-walled ring-shaped workpiece, should be along the axial quenching coolant. ⑤ cross-section of the workpiece is very different, should be a large section of the quenching section into the coolant. ⑥ concave workpiece should be concave upward quenching into the coolant. ⑦ single-sided slot workpiece, slot up, inclined 45 degrees quench into the coolant.