Fig. 1. Schematic of laser melting deposition forming system

Fig. 2. Principle and equipment of inside-laser powder feeding. (a) Device; (b) principle

Fig. 3. Particle size distribution

Fig. 4. Model of formed part . (a) Three-dimensional model; (b) critical forming points; (c) base plane and coordinate system transformation

Fig. 5. Diagram of forming stage change

Fig. 6. Diagrams of typical forming stage. (a) Sub-circular stage; (b) near-tetragon stage

Fig. 7. Schematic of continuous gradual slicing method. (a) Diagram of separating and splicing method in one layer；(b) diagram of continuous slicing method in each layer

Fig. 8. Matching diagrams of scanning velocity and laser power in forming process. (a) Schematic of scanning velocity changing in each single discrete unit; (b) schematic of laser power changing with the increase of forming layers

Fig. 9. Coordinate transformation of any spatial point P in base CSYS and tool CSYS. (a) Coordinates of point P in base CSYS; (b) position of base CSYS relative to base CSYS; (c) coordinate transformation diagram

Fig. 10. Transformation and combination diagram

Fig. 11. Schematic of tool center point setting

Fig. 12. Schematic of displacement compensation. (a) Schematic of posture changing; (b) schematic of displacement changing

Fig. 13. Forming stages. (a) Sub-circular stage; (b) near-tetragon stage; (c) sub-square stage

Fig. 14. Photos of formed part. (a) Left back side view; (b) right back side view; (c) top view

Fig. 15. Real size of forming part

Fig. 16. Geometric size measurement

Fig. 17. Microstructures at different positions. (a) Position 1; (b) position 2; (c) position 3