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为了提高钻杆的硬度和强度，采用了高频淬火处理钻杆，但是在加工和使用这种钻杆时，又产生了新矛盾。如蹾管机的卡瓦卡不住钻杆而无法蹾管，原有的钻杆拧卸工具在高频管面上打滑。开始我们用相应地提高卡瓦的硬度来解决新矛盾，但并不理想。后来，对“卡瓦卡钻杆”进行了详细的分析研究，明确了卡瓦要卡住钻杆，必须使卡瓦与钻杆之间的静摩擦力大于给进力。关键是如何提高静摩擦力。
In order to improve the hardness and strength of the drill pipe, the use of high-frequency quenching drill pipe, but in the processing and use of such drill pipe, they also created a new conflict. Such as pipe machine kava stuck drilling pipe and can not pipe, the original drill pipe unscrewing tool slipping on the high-frequency surface. At the beginning, we solved the new contradiction by increasing the hardness of the slips accordingly, but this was not ideal. Later, the “Kawabar drill pipe” conducted a detailed analysis and study, it is clear that Kawat stuck to the drill pipe, kava and drill pipe must make the static friction is greater than the feeding force. The key is how to improve the static friction.