Abstract: Aimed at the difficult mold design problem of unmanned aerial vehicle (UAV) blade plastic parts, which have special shape and difficult demoulding, the CAE analysis is used to determine the moulding and pouring scheme. Then, on the basis of the comparative analysis of the two demoulding schemes, a simplified two-plate mould is selected and designed for injection moulding, which effectively reduces the cost of mould manufacturing. In the Mould, the blade part of the plastic part is formed by the main part of the simplified two-plate Mould, which ensures the quality of the blade. The mortise and tenon part of plastic parts is moulded and demoulded by a new three-stage demoulding mechanism, which consists of two sub-mechanisms, one is movable seat plate mechanism and the other is compound mechanism of slider and ejector. When the mechanism demoulds, the first demoulding is carried out by means of the opening power of the mould, and the second side core pulling is carried out by means of the T-block driven by the cylinder. Mold, using the continuous ejection of the cylinder to drive the ejector pin to eject the plastic part completely from the side core. The mechanism design is ingenious and the Mould structure is simple, which can effectively reduce the manufacturing cost of the Mould.

Key words: unmanned aeral vehicle；blade； inection molding, mechanism design, mold design