Cutter deformation measuring fixture and cutter deformation online measuring method implemented by same

The invention discloses a cutter deformation measuring fixture and a cutter deformation online measuring method implemented by the same. The cutter deformation measuring fixture and the cutter deformation online measuring method are used for solving the technical problem of poor practicality of an existing real-time machine tool cutting force monitoring device. The technical scheme includes that the fixture comprises two semicircular clamping rings, a positioning disc, a sensor fixing base and four displacement sensors. The two semicircular clamping rings and the positioning disc form a clamping portion of the fixture, a circular hole is formed in the middle of the positioning disc, a cutter can conveniently penetrate the circular hole, the sensor fixing base and the positioning disc are fixedly connected with each other by four connecting screws, circular holes for mounting the displacement sensors are radially formed in the sensor fixing base, and the four displacement sensors are arranged along the radial direction of the cutter at intervals of 90-degree angles. The cutter deformation online measuring method includes recording X-direction and Y-direction components of deformation of the cutter in an industrial personal computer system by the aid of the four displacement sensors and visually displaying the X-direction and Y-direction components via a visual software interface in real time; calculating cutting force of the cutter in a deformation direction according to the deformation of the cutter in machining procedures. The deformation of the cutter is caused when the cutter is used for cutting. The cutter deformation measuring fixture and the cutter deformation online measuring method have the advantage of high practicality.