Research On Characteristics Of Standard Twist Drill Based On Finite Element Analysis

There are many methods of metal processing. Besides cutting method, there also exist many other metal processing methods such as casting methods of machining, welding and pressure processing, each kind of the machining method has its own applicable scope. However, these processing methods are usually only used to manufacture workblank, or make parts which precision and surface quality requirements are not high, and the parts which have the higher precision and strict surface quality relatively have to be machined by cutting method. In the process of metal cutting, drilling is one of the most common machining methods, occupied a big proportion. And twist drill is the most commonly used cutting tool in drilling process.Based on predecessors’ theory and research results, this paper selects a cone blade twist drill as the research object, analyses and studies its properties from different angles.Firstly, beginning with the formation principle of spiral groove surface of the cone blade twist drill, according to the mathematical equation of the linear edge, we obtain the parameter equation of the spiral groove surface and its parameter equation of the truncated shape, which prepares for the establishment of the 3D entity model of the standard twist drill.Secondly, according to the truncated shape parameter equation, with the help of MATLAB software’s data processing function, we can calculate the discrete data point set of the section curve of the standard twist drill. Importing the point set into UG software and using UG software to fit the section curve of the standard twist drill, we generate the body of the standard twist of the cone flank. Then selecting the appropriate grinding parameters of cone flank of standard twist drill, get its back knife surface with the entity cutting tools of UG software. And then complete the 3D solid model of the whole twist drill.Thirdly, when the 3D solid model of standard twist drill was established, we lay a foundation for the following finite element analysis of the structure and cutting simulation. Finite element analysis of the structure mainly contains static analysis of the structure, modal analysis and analysis of the buckling stability etc. Through the analysis, we can extract the static and dynamic load response of the twist drill, and study its static and dynamic mechanical properties. Cutting simulation is based on the cutting simulation software Deform 3D. Cutting load(force load and torque load) and cutting temperature load of the twist drill under different processing condition is simulated, which provides reference for the choice of cutting elements in practical machining.In summary, several main content aspects of this paper( establish the mathematical model of twist drill main surface, generate twist drill 3D entity model, analyze thermal and mechanical properties of the twist drill etc.) have some certain relationships. Firstly, establishing the mathematical model of twist drill main surface is the premise of generating 3D entity model of twist drill. Secondly, the generation of 3D solid model of twist drill is the basis of thermal analysis and mechanical properties analysis of twist drill. Thirdly, the successful generation of the 3D entity model of twist drill verify the mathematical model of twist drill main surface. Finally, analysis of the thermal and mechanical properties of twist drill can provide the basis for the optimization of 3D entity model of twist drill.