Vertical exchange working platform overturning drive device and manufacturing method thereof

The invention relates to a vertical exchange working platform overturning drive device and a manufacturing method thereof, being applied to a horizontal type five-axis numerical control machining center. The vertical exchange working platform overturning drive device is characterized in that the overturning structure is a four-link structure which is formed by three revolute pairs and a translation pair, wherein the first revolute pair has the rotation of the fixed end of a screw rod and a bearing seat around a central shaft; the second revolute pair has the rotation of an overturning platformdriven by the screw rod round a self fixed rotating shaft; and the third revolute pair is transmitted by a screw nut seat arranged at the other end of the overturning platform; a motor drives the screw rod for transmission, and tension pressure is applied on the screw rod, so that a two-force rod can be formed; a screw nut drives a sliding block to translate along the direction of the screw rod,and the sliding block is connected with a second transmission pair, so that the location of an overturning working platform can be realized by servo control, and conversion between vertical and horizontal types and accurate location of overturning can be realized. The manufacturing method comprises the key points: 1. when the overturning platform is positioned at the part of clamping workpieces, the distance between the overturning platform and the swing point of the screw rod is OP; 2. the overturning radius of the overturning platform is PQ; 3. the weight of the overturning platform and thediameter of the screw rod can be measured; and parameterization design is carried out on all moving key points, and the parts can be manufactured and assembled according to the data. The device provides overturning power for the accurate location of a vertical and horizontal double exchange working platform of a high speed horizontal machining center.