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目前勘探队钻杆头加热、镦厚,一般采用锻工焦炭炉和油压镦管机.钻杆头加热后的情况是越靠近端部温度越高,后部温度随长度增加而降低;镦厚后的情况是越靠端部越厚,后部逐渐减薄.根据丝扣的受力分析,危险断面是在后部丝扣退刀处附近(图1),该处受力最大,据有关资料分析,几乎承受总载荷的35%,而丝扣端部第一扣只承受总载荷的10%左右.因此这样加热、镦厚的钻杆头受力情况是不合理的.这种加热方法还存在如下的缺点:1)炉温和加热时间一时掌握不好,则容易烧坏钻杆头;2)钻杆内孔经常套进焦炭块,不易抠出,引起现场使用时堵水,甚至发生孔内事故;3)镦管机的轧辊与胎棍台肩容易被热蚀,影
At present, exploration team drill pipe head heating, upsetting, the general use of forging coke oven and hydraulic upsetting machine.After the heating of the drill head is closer to the end of the higher the temperature, the rear temperature decreases with increasing length; upsetting The thicker the situation is the more thicker the end, the rear gradually thinning.According to the threaded screw force analysis, the dangerous cross-section is in the vicinity of the back of the screw off (Figure 1), where the maximum stress, according to The data analysis, almost 35% of the total load, while the end of the first buckle endure only bear about 10% of the total load, so this heating, upsetting drill head force situation is unreasonable. The method also has the following disadvantages: 1) when the furnace temperature and the heating time are badly mastered, it is easy to burn out the drill head; 2) the inner hole of the drill rod is often set into a coke block, which is not easy to cut out, Hole accident occurred; 3) upsetting machine roll and tire shoulders easy to be thermal corrosion, shadow