Study On A New Laser Rapid Prototyping Equipment And Process Research

Profile invalidation laser rapid prototyping, also known as RIRP, is a newly proposed rapid prototyping method. Coated powder is used in PIRP for laser scanning. The eleveted laser beam invalidates CAD profile layer by layer, and stacks all those layers into the final workpiece. PIRP merits abundant material availability, saved laser processing paths, guaranteed accuracy, etc. It’s developed for massive prototype and casting mould manufacturing.Accumulated data from previous experiments and PIRP apparatus operation clarify urgent need for time saving, larger scale manufacturing ability, and machine structure improvement. Therefore works here propose a design for next generation PIRP system. Details on sub systems, such as numerical controlling, material supply and temperature controlling, laser scanning, work chamber moving, were all discussed. There principle, pros and cons were explained in deep. The newly designed system get improved in components compactness, thus brings processing speed800mm/s, and the size capability reach up to1200*700*500mm.It meets the industrial needs.The PIRP processing parameters were studied for coated sand. A geometric sphere stacking model was utilized to simulate the powder bed structure, therein the powder radius distribution and modal ratio influence shed on coordination number and stacking density were discussed. The results direct processing parameters for sand pre heating. Added is that an orthogonal experiment plan was carried out to get the matching curve for laser scanning power, speed, and layer thickness. Lastly, experiments concerning green part post process, such as intensify curing and workpiece decubing were carried and analyzed.Massive case studies were implemented to verify PIRP approach. There a pump propeller and Binaural base prototype were manufactured, and the dimension deviation was controlled below1%.Moreover.the PIRP technology combined with rapid casting technique, could fabricate aluminum alloy workpiece. There examples for complex surface parts, list as propeller and triple impeller see a surface accuracy range from Ra12.5to Ra25.Last but not the least, a case for automobile forging mould was fabricated to verify PIRP rooted near net rapid tooling. All those studies conclude that PIRP meets the fast moving market and its industrial application feasibility.