Development history of drill bit and drilling research
2021-09-27
1. Main areas of research and technical issues
In recent decades, research on Drill Bits and drilling has focused on the following five aspects in addition to improvements in Drill Bit making materials: 1Drill mathematical model and geometric design research: including the establishment of spiral groove, flank face, main edge and Chisel edge mathematical model, lateral truncation and optimization of drilling tip structure parameters, calculation and control of cutting angle (distribution), drill bit Static and dynamic analysis of the structure, study of the relationship between the geometry of the drill tip and the cutting and chip removal performance. 2 Drill manufacturing method research: including the establishment and optimization of the relationship between the geometric parameters of the drill bit and the sharpening parameters of the flank, the evaluation of the manufacturing precision and the quality of the sharpening and the measurement and control of the manufacturing error, and the design of the cutting shape of the spiral groove processing Tool Calculation, bit processing equipment, especially the development of CNC grinding machines and processing software. 3 Drilling process and drilling quality research: including various factors affecting the drilling process and analysis, modeling and monitoring of various physical phenomena (such as drilling force, cutting edge stress and temperature distribution measurement, modeling) And prediction); study of bit wear, damage mechanism and bit life; study of bit deformation, deflection, slippage during drilling and drilling tip; drilling process (eg vibration drilling, high speed drilling, deep hole) Drilling, stability of the drilling process, etc.) and drilling quality (pore position accuracy, straightness, surface roughness, cylindricity, diameter, orifice burrs, etc.). 4 drilling mechanism and various high performance drill bits (such as group drill, gun drill, dry cutting drill, micro hole, deep hole drill, long drill bit, indexable drill bit, synthetic material processing drill bit, woodworking drill bit, multi-spiral drill bit Etc.). 5 drilling process model verification and bit performance evaluation process automation, cutting conditions and bit shape selection database and knowledge base establishment. At present, the most dynamic research areas are mathematical models of drill bits, geometric design and manufacturing methods (equipment), drilling process modeling and drilling quality research. 2. Research on mathematical model and geometric design of drill bit
2.1 Mathematical Model of the Drill The mathematical model of the drill bit is the basis for geometric design, manufacturing, cutting performance analysis and modeling of the drilling process. The first mathematical model of the drill bit was proposed by Galloway DF in 1957. He derived the parametric equation of the rake face of the straight edge drill bit, and gave the definition, calculation formula and measurement method of the front edge, the back angle and the bevel angle of the main edge, and proposed "the flank face of the drill bit as the bit in the sharpening process. A view of a part of a grinding cone formed after interaction with a Grinding Wheel. In the early 1970s, Fujii S et al. further studied the model proposed by Galloway DF and proposed to use the cutting plane method to analyze the 3D spatial surface into a two-dimensional plane curve and develop a Twist Drill computer. Auxiliary design program. In 1972, Armarego EJA and Rotenbery A found that the flank face sharpening method has four independent sharpening parameters, and generally only three geometric parameters of the drill tip are given, so the shape of the flank of the drill tip cannot be uniquely determined. And sharpening parameters. To this end, they proposed using the flank clearance angle as a supplementary geometric parameter to obtain the only solution to the sharpening parameters. In 1979, Tsai WD and Wu SM proved that the flank faces of tapered drills, Racon drills, auger drills and Bickford drills can be represented by quadrics, and a comprehensive mathematical model representing the geometry of the drill bit is proposed. Can be used to control the sharpening process. In 1983, Radhakrishnan L et al. proposed a mathematical model of the flank of a cross drill bit. They divided the flank into a first flank and a second flank: on the first flank, based on the Tsai model, an improved cone model was established; for the second flank, a second flank was established. A flat model. Fugelso MA proposed a mathematical model of the cylindrical tip. In 1985, Fuh KH et al. established a mathematical model of the flank face of a drill with a quadric surface to design it into an ellipsoid, a hyperboloid, a cone, a cylinder, or any combination thereof.
