Preparation method of selective laser melting forming ventilation structure

The invention relates to a preparation method of a selective laser melting forming ventilation structure. The preparation method comprises the following steps that 1, metal powder forms a first machining layer; 2, metal powder is gradually laid on the first machining layer in a multi-layer powder laying machining mode, so that the degree that an incomplete fusion gap is formed between every two layers of fusion channels can be achieved; 3, in the layer-by-layer powder spreading processing process, translation or rotation is conducted through the rotation angle, and therefore continuous changes of the holes in the space are achieved; and 4, reinforcing ribs are added in the forming process of the ventilation structure, and finally the laser melting forming ventilation structure is obtained. According to the air-permeable structure preparation method combining the SLM forming technology and the forming strategy, the strength of the air-permeable structure is optimized, the continuous positions of the holes of t