Flexible polyurethane grinding head for free-form surface polishing machine of mould

The invention provides a flexible polyurethane grinding head for a free-form surface polishing machine of a mould, belonging to the field of polishing. The flexible polyurethane grinding head consists of a polyurethane layer (1), a bonding layer (2), a sand handle (3), a positioning ring (4) and a chuck (5), wherein the polyurethane layer (1) is bonded on the sand handle (3) by the bonding layer (2), and polyurethane grinding heads with different rigidities, densities and shapes can be obtained according to the different material proportions and machining demands, so that the proper polyurethane grinding head can be selected according to the practical machining demand. The positioning ring (4) and the chuck (5) are manufactured in an integration way, and the polyurethane grinding head is fixed on a rotating shaft of the free-form surface polishing machine of the mould by the positioning ring (4) and the chuck (5), so that the revolving balance during polishing can be guaranteed.