Dynamic balancing and center of mass drilling，High-speed external milling roughing crankshafts，Application of CNC crankshaft grinding machine

   Dynamic balancing and center of mass drilling
The positioning reference in the crankshaft machining process is the center hole, which can be divided into the geometric center hole and the quality center hole according to its machining position. The geometric center of the crankshaft’s main bearing journal is found out by using the V-shaped block or other means, and the center hole machined on this center is called the geometric center hole. The center of mass of the crankshaft is measured using special test equipment, and the center hole machined on this center is called the center hole of mass. When the geometric center hole is used for subsequent turning and grinding, the centrifugal force generated by the rotation of the workpiece will affect the quality of processing, and the remaining dynamic imbalance after machining is large, and it is necessary to repeatedly measure and de-emphasize the weight in the dynamic balancing process in order to meet the technical requirements, which is inefficient, affects the production beat, and causes an increase in the rate of semi-finished product rejects and the loss of positioning elements. Adopting the center of mass hole can solve such problems and improve the cycle beat.
   High-speed external milling roughing crankshafts
High-speed external milling roughing crankshaft main journal, connecting rod journal and shoulder, than CNC turning, CNC internal milling, car – car pulling high productivity and stable quality. For example, CNC turning – turning and pulling process requires two processes to machine connecting rod journals, while CNC high-speed external milling can be completed in just one process. The significant features of high-speed external milling roughing crankshaft are: cutting speed up to 350m/min, short cutting time, short cycle time of the process, lower cutting force, low temperature rise of the workpiece, high tool life, fewer tool changes, and higher machining accuracy, Flexibility is better, is the development direction of crankshaft main journal and connecting rod journal roughing.
   Application of CNC crankshaft grinding machine
Rough grinding of main shaft journals, connecting rod journal journals, side walls and countersinking grooves. CNC crankshaft grinding machine can grind all crankshaft main journal and connecting rod journal in one clamping. This kind of grinding machine is generally equipped with double grinding wheel headstock, which can meet the requirements of multi-species, cost, high precision and mass production, and apply the servo-linkage control technology of workpiece rotary and grinding wheel feed to complete all journals grinding without changing the crankshaft rotary center at one time clamping, including the follower tracking grinding of the connecting rod journal; adopting the static-pressure main shaft, static-pressure guideway, static-pressure feed screw (wheel headstock) and linear grating closed-loop control system, the grinding journal roundness can be achieved. The use of hydrostatic spindle, hydrostatic guideway, hydrostatic feed screw (grinding wheel headstock) and linear grating closed-loop control system ensures high accuracy of grinding journal roundness and high grinding efficiency.