# The Impact of Drilling Parameters on Drilling Temperature in High-Strength Steel Thin-Walled Parts
## 5 Conclusions  
The distribution and change characteristics of temperature field on the bottom surface in the thin-wall drilling process of AF1410 high-strength steel were investigated through single-factor experiments. The influence of the drilling dosage on the drilling temperature was also explored, and the main conclusions were as follows:  
1. During the thin-wall drilling process of high-strength steel, the temperature field on the bottom surface of the workpiece shows an obvious circular gradient distribution. With the continuous feeding of the drill, before reaching the highest temperature of the bottom surface, the temperature of the middle extrusion friction zone is the highest, and the area does not change much, remaining almost the same as that of  
Figure 14: Influence of feed rate on the rate of increase in the maximum temperature on the bottom surface of the workpiece during drilling.  
Figure 13: Curves of the maximum temperature of the temperature field on the bottom surface of the workpiece under different feed rates.  
the cross-cutting edge. While the cutting area increases with the length of the main cutting edge involved in cutting, the annular area of the cutting zone increases; and at the same time, the area of the heat diffusion zone is also gradually enlarged. When the top edge of the drill bit reaches the C' position near the bottom surface of the workpiece, the maximum temperature of the bottom surface can be approximated as the temperature of the top edge of the drill bit and the workpiece extrusion friction area. The maximum temperature of the bottom surface of the workpiece is the highest in the whole drilling process when the drill cap is formed and not yet ruptured. 2. The temperature of the top flank zone of the drill bit (the temperature of the top flank zone when the drill bit was at the C' point) increased with the increase in drilling speed and feed, and the temperature of the top flank zone of the drill bit increased from 219.6 \({}^{\circ}\)C to 363.4 \({}^{\circ}\)C when the drilling speed was increased from 12.56 m/min to 37.68 m/min; the temperature of the top flank zone of the drill bit increased from 237.4 \({}^{\circ}\)C to 302.1 \({}^{\circ}\)C when the feed increased from 0.01 mm/r to 0.075 mm/r, and decreased slightly to 295.1 \({}^{\circ}\)C when \(f\) = 0.1 mm/r. When the feed was increased from 0.01 mm/r to 0.075 mm/r, the temperature of the top edge zone of the drill bit increased from 237.4 \({}^{\circ}\)C to 302.1 \({}^{\circ}\)C, and slightly decreased to 295.5 \({}^{\circ}\)C at \(f\) = 0.1 mm/r. 3. The temperature field on the bottom surface of the workpiece during the drilling process has the same rule of change--in general, at different speeds and feeds, the maximum temperature on the bottom surface of the workpiece increases nearly linearly with the drill bit during the drilling process, and the slope of the increase in the maximum temperature increases nearly linearly with the improvement of the drilling speed and the feed. Thus, the influence of the feed on the slope of the maximum temperature increase is larger than that of the drilling speed. 4. Compared with existing studies, this work presents, for the first time, the distribution and evolution of the temperature field on the bottom surface of AF1410 high-strength steel thin-walled parts during drilling. While confirming the general rule that drilling temperature is influenced by cutting speed and feed rate, the study further quantifies--taking the specific properties of AF1410 steel into account--the effects of varying cutting speeds and feed rates on the bottom-surface temperature field. These findings lay a solid foundation for future investigations into the drilling of high-strength steel thin-walled components.