钻井实践表明,镶齿钻头的缺点是齿从牙轮上脱落,故往往不得不提前起钻,使钻头得不到充分的使用。脱齿或要发生在外圈齿上,因为外圈齿上的速度和动载大大高于其他各圆齿。对脱齿的原因研究文献不多。实际钻井上发现的脱齿都是由于没有按照技术规定将齿压入齿轮体内。例如,常常不能保证所要求的过盈,使其连接强度降低。为消除这一点,必须采用选配方法。 Drilling practice shows that the disadvantage of the insert bit is that the teeth fall off the roller cone and therefore often have to drill in advance so that the drill bit can not be fully used. Teeth off or to occur in the outer ring teeth, because the speed and the dynamic load on the outer ring gear is much higher than the other crooked teeth. There is not much research literature on the cause of tooth removal. De-teeth found on actual drilling are due to the fact that the tooth is not pressed into the gear body in accordance with the technical regulations. For example, often the required interference can not be guaranteed, reducing the strength of the connection. To eliminate this, we must adopt matching method.