Abstract
Heat conduction model of the blade of tool was established during the process of rock cutting with water jet. Based on the analysis of the conversion between thermal and power in rock cutting, computational methods of the boundary conditions such as heat flux, interface temperature were given. Thereby the temperature field model of the blade was established in rock cutting with water jet. The thermal stresses of drill bit were analyzed and computational models of the thermal stress were also presented. The influence of parameters to the thermal stresses such as jet pressure was analyzed and computational methods were also given. The results show that thermal stresses are the main factors which induce the tool failure. The thermal stresses are influenced by material properties of the tool and rock, blade sizes, cutting force and speed, jet pressure. The thermal stresses of drill bit can be decreased efficiently by water jet and it is proportional to the reciprocal of four square root of the jet pressure. The life cycle of the tool will be prolonged without earlier failure if the parameters are controlled in critical range.
| Original language | English |
|---|---|
| Pages (from-to) | 152-156 |
| Number of pages | 5 |
| Journal | Meitan Xuebao/Journal of the China Coal Society |
| Volume | 36 |
| Issue number | 1 |
| Publication status | Published - Jan 2011 |
| Externally published | Yes |
Keywords
- Rock cutting
- Temperature
- Thermal stress
- Tool
- Water jet