A laser sintering apparatus and method for sintering

The present invention provides a method for laser sintering and a sintering apparatus. The laser sintering apparatus comprising: a first laser head, for a first laser output power; a second laser head for the second laser output power; drive means for driving the first laser and the second laser head moving head the first and second laser head laser head treat the same area on the sintered material is heated separately. When the present invention is the use of two laser heads on the material to be sintered in the sintering treatment by heating means provided, the two laser heads sequentially treat a sintered material to be heated are heated, treated sintered material is performed prior to such laser sintering after the preheating treatment, laser sintering or a sintered material is annealed, before the laser sintering so as to reduce as compared to the temperature difference between the laser sintering or reduce the rate of decline after laser sintering temperature to reduce the stress of the substrate material to be sintered , avoid cracks caused by shrinkage stress and even breakage.