Method for predicting normal service life of hob

According to the method for predicting the normal service life of the hob, the abrasion rule of a shield cutter head tool in the cutting process is obtained based on the stratum characteristics and the shield tunneling parameter change rule, and thrust distribution and an energy conversion coefficient are considered. And on the other hand, aiming at the normal abrasion condition of the shield hobbing cutter, the shield tunneling environment is fully considered, a large amount of engineering data is combined, the calculation process of the thrust conversion coefficient and the energy conversion coefficient is obtained, then the longest tunneling distance before the hobbing cutter is damaged in engineering is calculated, and therefore the normal service life is predicted. According to the technical scheme, the longest tunneling distance can be predicted by predicting the normal abrasion loss of the shield hob, and a scientific method can be provided for predicting the hob changing time and the hob changing posi