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我厂生产Φ36～75毫米的20CrMnTi、20Cr、20CrMo、40Cr、GCr15等合金结构钢和轴承钢,大部分用在拖拉机上作齿轮、轴承套等零配件。为防止在热压力加工时,因钢材皮下缺陷造成破裂,用户要求作热顶锻检验。热顶锻检验按“GB223-63金属冷热顶锻试验法”进行。即被检材料在保留原轧制面情况下,取一段高度为直径两倍的试样,在规定锻压温度范围内,锻打至1/3的高度(图1)。检查顶锻后试样侧面如无裂缝、裂口、贯裂、扯破、折迭或气泡,即认为试样合格。
I plant Φ36 ~ 75 mm 20CrMnTi, 20Cr, 20CrMo, 40Cr, GCr15 and other alloy steel and bearing steel, most of the tractors used in gear, bearing sleeve and other spare parts. To prevent the hot pressure processing, due to subcutaneous defects caused by steel rupture, the user asked for hot top forging test. Hot upset test by “GB223-63 metal hot and cold forging test method”. That is, the test material retains the original rolling surface, take a height of twice the diameter of the specimen, forging temperature range, forging to 1/3 of the height (Figure 1). Check the specimen after upset for no cracks, cracks, split, tear, fold or bubble, that the sample pass.