Supervisor:
Southwest Ordnance Industry Bureau
Organizer:
Chongqing Ordnance Industry Society
Chongqing University of Technology
Chongqing University of Technology
The influence of suspended dimensions on drilling force and deformation of high strength steel thin wall panels
| DOI: | 10.11809/bqzbgcxb2025.02.035 |
| Keywords: | AF1410 high strength steel; thin walled parts; drilling; workpiece size; constraint method; axial force |
| Abstract: | Drilling is an important machining process for AF1410 high strength steel thin walled parts, and the hanging size and constraint method of the workpiece directly affect its stiffness, machining deformation, and machining accuracy after clamping. This article uses experimental methods to study the influence of the suspended size and constraint method of AF1410 high strength steel thin wall panel workpiece on the axial force and deformation during drilling process. The research results indicate that during the initial drilling stage of AF1410 high strength steel thin walled parts, an outward convex elastic deformation with linear increase in axial force is generated, and the axial force during drilling is mainly generated by the elastic deformation resistance of the workpiece. Under the four sided constraint conditions, the suspended size of the workpiece has little effect on the maximum axial force during the linear increase stage of the initial axial force during drilling; The basic range of variation is between 169 N and 193 N; In the initial stage of drilling, the maximum elastic convex deformation of the workpiece increases with the increase of the suspended size of the workpiece, and the maximum convex deformation is about 0.31~0.54 mm; the linear increase rate of axial force decreases with the increase of the suspended size of the workpiece. Among them, square workpieces that change both directions at the same time have greater changes than rectangular workpieces that change a single size; with a maximum change amplitude of 174.5 N/s. As the suspended size of the workpiece increases, the maximum axial force during the entire drilling process slightly decreases, and the drilling lag time increases with the increase of the suspended size of the square workpiece, and the maximum drilling delay time is about 1 second. The effect of changing the single hanging size of a rectangular workpiece on the drilling lag time is smaller than that of a square workpiece. The constraint method has little effect on the maximum value of the linear change stage of axial force in the initial drilling stage. In the stage of linear increase of axial force in the initial drilling stage, the maximum convex deformation of the workpiece generally decreases with the strengthening of constraint stiffness. When constrained by two short edges, the maximum convex deformation of the workpiece is 0.61 mm, and when constrained by four edges, the minimum convex deformation of the workpiece is 0.36 mm; The rate of linear increase of axial force increases with the strengthening of constraint stiffness; The overall lag time of drilling decreases with the strengthening of constraint stiffness, and the amplitude of change ranges from 0.24 s to 0.51 s. |
| Issue: | Vol. 46 No. 2 (2025) |
| Published: | 2025-02-28 |