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小钎杆在锻造区折断是最常见的,它比热处理、腐蚀的破坏性还大。因此,要想反映出热处理、抛丸和防腐的实际意义和效果,必须首先查明小钎杆在锻造区早期破坏的规律、原因及解决办法,这不仅对制钎厂,而且对矿山修复钎杆也有实际意义。所谓小钎杆在锻造区破坏,即在锻造加热影响区内的破坏,主要是尾端50～70毫米处、根部108毫米处、钎肩中间、钎肩前(即尾端起130～200毫米)处和梢锥五个部位折断。在锻造区折断,钎杆寿命很低。1970～1981年我厂小钎杆各折断部位百分比和排列图如图1、2所示。
Small drill in the forging area is the most common fracture, it is more than heat treatment, corrosion damage is still large. Therefore, in order to reflect the practical significance and effect of heat treatment, shot blasting and anticorrosive, we must first identify the rules, causes and solutions of the small drill rod destruction in the early forging zone, which not only for the brazing plant, but also for repairing the drill rod It is also meaningful. The so-called small drill rod destruction in the forging zone, that is, forging in the area affected by the damage, mainly at the end of 50 to 70 mm at the root of 108 mm at the middle of the brazing shoulder, before the brazing shoulder (ie, the tail from 130 to 200 mm ) Department and tip cone five parts broken. Broken in the forging zone, drill rod life is very low. From 1970 to 1981, the percentage and arrangement of small drill rods in each broken part are shown in Fig. 1 and 2.