Research On Virtual Prototype Of New Twist Drill Sharpener Based On Cone Sharpening Method

The processing of holes is the most common process in metal cutting.Twist drills,as an important tool for hole processing,are consumed in large quantities in the production process.The small and medium-sized enterprises in our country do not have the ability to sharpen the sharpening equipment that meets the needs.In many cases,the twist drill is used as a disposable tool,which causes a lot of waste of resources.A virtual prototype for the twist drill sharpener for the secondary sharpening of twist drills was designed.Due to the simple control method and wide application of the cone sharpening method,the virtual prototype of the twist drill was designed based on the cone sharpening method..The influence of the sharpening parameters of the cone sharpening method on the geometric angle of the drill tip was studied.First,the new method is used to model the straight main cutting edge twist drill,and the geometric angle of the drill tip is measured in3 D software.Secondly,the back angle of the twist drill is solved in Matlab,and the change of the drill tip geometric angle is analyzed in conjunction with the calculation results.Finally,based on AdvantEdge drilling simulation experiments on different materials,for the processing of different materials,the impact of the geometric parameters of the drill tip on the processing technology was analyzed,and the parameters of the twist drill were optimized during the drilling process,and the processing was given.For different materials,the recommended value of the twist drill sharpening parameters is optimized.The virtual prototype of the new twist drill sharpener is designed according to the principle of cone sharpening.The plane transmission mechanism is designed to realize the sharpening of the virtual inner cone surface,which separates the high-speed rotation of the grinding wheel and the low-speed revolution of the virtual inner cone surface.By adjusting the position of the grinding wheel axis and the virtual inner cone surface axis,the offset e can be adjusted.The three-dimensional model of the virtual prototype was built,and the global interference analysis and collision analysis of the assembled virtual prototype were carried out.Based on the kinematics and dynamics theory in the Adams generalized coordinate system,the kinematics and dynamics of the virtual internal cone transmission mechanism aresolved.The gear transmission principle is used to calculate the angular velocity of each transmission shaft,and the calculation results are verified.The movement trajectory of the output is analyzed.Combined with the actual sharpening process,the effects of the two conditions of the grinding wheel speed and feed speed in the same and opposite directions on the driving torque are analyzed.When the wheel speed and feed speed direction are the same,the torque on the drive motor is less affected,and vice versa.Therefore,the virtual prototype design should keep the wheel speed and feed speed direction the same.