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我厂用于CA-30型汽车前钢板第一片上支承碗的下料凹模,材料为9CrWMn,其形状尺寸如图1。热处理工艺为:820℃淬火加热,200～220℃回火1.5小时。处理后的凹模使用寿命极短,冲200余片后便崩刃。为提高韧性,将回火温度提高到280℃,硬度HRC57左右,但仍很脆,只冲不到100片就崩刃。因该产品年产量较大,因此亟待解决。我们分析凹模崩刃的原因是由于冲裁零件较厚(4毫米热轧钢板),凹模承受冲击载荷较大(冲裁力约80吨),原来采用180℃回灭时冲击韧性较低,故产生早期崩刃损坏。为提高其韧性而将回火温度提高到280℃,而冲击韧性更低,我们估计此温度正好处于该钢第一类回火脆温度区域内。由于有关这一钢种的资料较少,我们
I plant for CA-30-type steel plate on the front of the first supporting bowl feeding die, the material 9CrWMn, the shape and size shown in Figure 1. Heat treatment process: 820 ℃ quenching, tempering 200 ~ 220 ℃ 1.5 hours. After processing the die life is very short, more than 200 pieces after chipping. To improve the toughness, the tempering temperature was raised to 280 ℃, hardness HRC57 or so, but still very fragile, only less than 100 red burst collapse edge. Due to the large annual output of the product, so urgent solution. Our analysis of die chipping because the blanking parts thick (4 mm hot-rolled steel), die to withstand greater impact load (blanking force of about 80 tons), the original use of 180 ℃ when the back-off impact toughness is low , So early collapse caused by damage. To increase its toughness, the tempering temperature was increased to 280 ° C and the impact toughness was lower, which we estimate was just within the tempering temperature range of the first type of steel. As less information about this steel, we