## 4 Conclusions  
(1) In the early stage of drilling a thin-walled plate of AF1410 high-strength steel, the thin-walled plate produces overall convex elastic deformation; the drill bit does not drill into the workpiece at this stage; the axial force is mainly caused by the elastic deformation resistance of the workpiece, which grows linearly; at this stage, the maximum axial force and the amount of convex deformation increase with the increase in feed, but the drilling speed does not have much effect on it. (2) When the overall convex elastic resistance of the thin-walled plate at the early stage of drilling increases to withstand the axial force of drilling, the drill starts to drill into the workpiece, the increase in axial force at the early stage of drilling is dominated by the extrusion of the top edge, and with the drilling, the role of the top edge is stabilized, the length of the main cutting edge involved in the cutting is gradually increased, and the axial force is increased by a small slope in an approximate linear manner. (3) In the top edge drilling to the position near the lower surface of the workpiece, under the action of axial force, the top edge of the material to be processed under the local plastic convex deformation of the layer, with the feed of the drill, in the tip of the rotary pressure plus extrusion, near the bottom surface of the workpiece and the main cutting edge in contact with the annular area of the processed layer of the material, yielded to turn over continuously; the formation of the inner surface of the rotary surface of the tip and the tip coincided with the cap of the drilling. The critical thickness of yielding and flipping increases with the increase in cutting temperature. (4) The characteristics of the formation of the drill cap under different cutting speeds directly affect the formation of edge defects of the workpiece; the higher the cutting speed or the larger the feed, the larger the edge of the plastic deformation caused by the crimping and other defects is, while the lower the cutting speed or the smaller the feed, the flatter the edge of the hole; however, the feed is too small due to the extrusion caused by the cutting edge radius of the bottom surface under the tip of the drill at higher temperatures, and there is a clear hole outlet. The hole exit also has obvious curled edges. (5) The drilling temperature generally increases with the increase in drilling speed and feed rate, but at the feed rate \(f\) = 0.01 mm/r, the drilling temperature is higher due to  
Figure 15: Influence of feed on the amount of convex deformation of thin-walled plates before drilling into the drill bit. the small feed rate and the influence of the cutting edge radius, which results in a larger extrusion friction in the drilling process of the drill bit. (6) When the drilling temperature is higher and the critical yield flange thickness is larger, the drilling axial force increases sharply. (7) When the cutting speed is less than 25.1 m/min and the feed rate is less than 0.05 mm/r, the size of the hole edge defects can be reduced, and the quality of the hole exit edge can be improved. The authors confirm contribution to the paper as follows: conceptualization, Y.Z. and S.H. ; methodology, Y.Z. and S.H. ; software, Y.Z. ; validation, Y.Z., C.L. and R.L. ; formal analysis, Y.Z., S.H. and C.L. ; investigation, Y.Z. and L.X. ; data curation, R.L., Y.S. and L.X. ; writing--original draft, Y.Z. and C.L. ; writing--review & editing, S.H. and R.L. ; supervision, Y.S. All authors have read and agreed to the published version of the manuscript. This work has received funding from the key technology research and development project \"Unveiling the List and Leading the Way\" in Shenyang, Liaoning Province. Not applicable. The original contributions presented in this study are included in the article. Further inquiries can be directed to the corresponding author. I would like to thank all the teachers and students in the laboratory for your help and valuable suggestions during the research process.