The grinder is a national 863 support project in 2008.
The machine tool adopts the grinding method which is based on the grinding point cut. It does not need the auxiliary mechanism such as eccentric fixture, indexing device and so on. Using imported spindle system, the maximum speed of CBN grinding wheel can reach 120m/s. We have developed the interpolation software of the crankshaft cutting point tracking and grinding, and the grinding point of the grinding wheel is always following the rotation of the crankshaft to realize the high precision grinding of the crankshaft. The feed of the grinding wheel is driven by straight line, which has the characteristics of high acceleration response. At the same time, the rigidity and the sensitivity of the grinding wheel are improved by using the self designed cylindrical hydrostatic guideway.
The machine tool head and tail frame adopt the torque motor to control the rotation of the crankshaft simultaneously, so as to realize the high precision synchronous interpolation grinding of the front and rear synchronization and the circumferential angle and the grinding wheel feed. Mapos P7 was used to measure the rotor with the momentum meter to realize the closed grinding of the crankshaft.
Grinding wheel moving system
The moving system of the grinding wheel rack is arranged on the bed body through a V- flat guide rail, and the base of the grinding wheel frame is connected with the backing plate through a cylindrical hydrostatic guide rail. To ensure the verticality of the V- guide rail and the cylindrical hydrostatic guide rail, the cross guide rail structure is adopted. Rail protection can be stainless steel protection. The longitudinal movement and the movement of the grinding wheel, the detection switch is installed and protected, the moving grating is HEIDENHAIN, the pressure protection. Tail frame
Tail frame
The T type bolt, head and tail frame using 1FW6090 direct drive synchronous rotating spindle head tail, tail frame with THK spindle bearings, high 340mm, rotary dial is 250 mm, the top 5# Morse top, hydraulic moving distance of 50 mm.
Design of on line measuring mechanism
Crankshaft main journal and connecting rod journal center are not on the same axis, with the tracking method of grinding machining of crankshaft connecting rod neck, the connecting rod neck axis for rotary movement in the circumference of a fixed, online measurement, to probe the automatic tracking of crankshaft for rotary motion, quasi with the structure, the cylinder connecting rod telescoping mechanism, slewing mechanism, spring tensioning mechanism and measuring head weight pressure device ensure online measurement instrument. In the grinding process, the axial positioning of the workpiece, the measurement of the grinding axis and the grinding wheel, the positioning of the workpiece and the measurement of the radial direction of the grinding shaft are discussed.