Energy-saving Optimization Of Curved Generating Line Of Rake Face For Twist Drills

Most of twist drills used in the actual production processing are straight edges andrake faces with linear generating line. However, the distribution of cutting angles for thesetwist drills is unreasonable, resulting in high cutting power, it leaves much room forimprovement. In order to improve the cutting performance of twist drills and reduce theenergy consumption, traditional optimization studies have focused on the grinding of flankface, such as the mutifacet drill. Studies about the optimization of curved generating lineof rake face are much less. In this paper, to reduce energy consumption for drilling, theenergy-saving cutting edge shape is found, then the spiral rake face is generated by theenergy-saving cutting edge. The main work is as follows:The Plannar Displaying method is applied to establish the calculation model ofcutting angels of twist drills with arbitrary curved cutting edge. The mathematical modelof drills with conicoid flank face and the relational model between the structure andgrinding parameters are established, the grinding parameters are obtained by optimizationtechnique. Based on Planar Displaying method and multi-joint linkage, the single pointtools with different combination of cutting angles along the cutting edge of the twsit drillare sharpened, cutting test of elementary cutting tools(ects) is conducted. The linearsynthesis method of ects is applied to establish the mechanical model of the twist drillswith arbitrary curved cutting edge. Twist drills with conical and plane flank face areoptimized based on improved dijkstra algorithm, the path of energy-saving cutting edge isobtained. By changing the structure parameters of drills with conical flank face, therelational model about structure parameters and minimum power is established.The average percentage of energy savings of four optimized drills are:12.153%,10.565%,12.068%,8.605%, the energy saving percentage is obvious. According to therelational model about structure parameters and minimum power, the mostenergy-efficient structure parameters are choosed in appropriate range, the minimumpower is777.622w, the percentage of energy saving is21.32%. The twist drill with themost energy-efficient structure parameters is conducted a strength, stiffness and modalanalysis; the results can meet the requirements.