Research On The Grinding Process Of The Shaped Edge Of The Wood Thread Cutter

As a type of woodworking forming milling cutter,wood thread cutter has excellent cutting performance and strong pertinence.It is widely used in milling processing of wood forming surface.The revolving contour accuracy of the forming blade and the quality of the flank surface directly affect the quality of the formed surface and the processing accuracy of the processed material.Domestic related research on the processing and manufacturing of wood thread cutter forming blades started late and less researched.It is aimed at the low manufacturing efficiency and irregular turning profile of forming blades caused by the characteristics of long forming blades,large shape spans and asymmetry between teeth.There is still a lack of reasonable and effective solutions to problems such as low accuracy.This paper analyzes the structural characteristics of the formed edge of the wood thread cutter and its spatial geometric relationship with the revolving profile.First,the blade line model of the flank surface of the formed blade is established through the revolving profile of the tool;Grinding model for three-sided grinding of the machined grinding wheel,and the grinding process was optimized for the problems of grinding wheel compensation and spiral forming edge;then the grinding trajectory of the auxiliary grooving process was studied,and finally the grinding model was verified through actual machining The correctness and practicality of process optimization.The specific research is as follows:(1)Modeling of forming edge curve and flank faceBy analyzing the structure of the wood thread cutter,the workpiece coordinate system and the reference coordinate system are established,and the forming edge curve and the related structural parameters of the flank surface under the corresponding coordinate system are defined.The calculation and derivation of the forming edge curve model is completed,and the ruled flank model is derived based on the edge line model.Finally,the parameterized expression of the forming edge curve and the flank surface in the workpiece coordinate system is realized through coordinate transformation.(2)Grinding path of the flank face of the formed bladeThe appropriate initial posture of the grinding wheel is analyzed and defined,and the center point coordinates of the end face of the grinding wheel and the grinding wheel axis vector under the initial posture are calculated.By defining the process parameters and adjusting the grinding wheel posture based on the initial posture of the grinding wheel,the flexible adjustment of the grinding wheel is realized to avoid grinding interference.Then traverse all the blade points to form a grinding wheel grinding track.(3)Optimization of flank sharpening processAnalyzed and defined the three-sided grinding method of the flank face of the formed blade.Through the spatial position relationship between the reference coordinate system(floating coordinate system)and the workpiece coordinate system that changes with the blade point,the grinding wheel applied grinding surface was judged to realize the grinding The flexible surface change improves the efficiency of sharpening.Combining the characteristics of the grinding wheel used in the processing of the formed edge of the wood thread cutter,the fillet of the grinding wheel is compensated to improve the sharpening accuracy.By analyzing the structural characteristics of the spirally formed edge,on the basis of the above-mentioned non-spirally formed edge grinding path algorithm,the grinding wheel grinding trajectory of the spirally formed edge flank is calculated.(5)Grinding track of auxiliary grooving processThe structural characteristics of the auxiliary grooving process are analyzed,and the grooving coordinate system that changes with the cutting edge point is established on the basis of the workpiece coordinate system.The relevant process parameters are defined on the slotting coordinate system,and the grinding point track of the auxiliary slotting corresponding to any cutting edge point is calculated.Based on the analysis of the grinding point trajectory,the initial posture of the grinding wheel is defined,and then the required inclination angle of the grinding wheel is calculated according to the shape of the forming edge,and the center point coordinates of the end face of the grinding wheel and the grinding wheel axis vector are calculated.Then traverse the grinding point to form the grinding wheel grinding track of the auxiliary grooving process of any blade point,so as to achieve the purpose of auxiliary chip removal and vibration reduction.Finally,simulation processing and actual processing verification are carried out according to the research content,and the correctness and effectiveness of the flank surface of the formed blade and its related processes are verified through parameter measurement,which provides certain theoretical support for the processing of the flank surface on the wood thread cutter's formed blade and related processes.