The characteristics of drilling force modeling and its research development in foreign countries
The research on drilling force modeling is deepening with the development of various new drill bits and drilling processes. WuSM et al. have done a lot of work in establishing the cutting force model of group drilling. Among them, LeeSW (1986) and FuhKH (1987) used the working cutting angle as the criterion, used the bevel cutting model for the main cutting edge and the right-angle cutting model for the second cutting edge, and established the cutting force model of the group drill; HuangHT (1992) et al. proposed a method for predicting the axial force and torque of group drills using the mechanical model of ordinary twist drills. Armarego EJA and ZhaoH (1996) established a cutting force prediction model for thin core standard twist drills, thin core multi-groove drills and circular arc center edge twist drills. Bhatnagar N (2004) et al. studied the unintended damage of workpieces when drilling anisotropic fiber-reinforced composites with 4 different drill tips, and established a model of drilling axial force and torque. SahuSK (2004) et al. proposed a cutting force prediction model for tapered twist drills with chipbreakers. The model was calibrated with drills with four different chipbreakers and can be applied to drills with arbitrary chipbreaker shapes. ElhachimiM (1999) comprehensively applied right-angle and oblique-angle cutting models to establish the cutting force model of high-speed cutting drills. The results are consistent with the model predictions. WangLP (1998) and others proposed to obtain the dynamic mechanical characteristics of the entire drill bit through the vibration analysis of the unit tool that composes the main edge and the chisel edge, and established a prediction model for the dynamic axial force and torque during vibration drilling. With the deepening of the research, the researchers found that due to the difference in structure, the mechanical model established in the past could not be applied to the new drill type. To this end, StephensonDA (1992) used a unit tool bevel cutting force model calibrated with a large number of turning experiments to establish the main edge torque, axis Predictive models for radial and radial forces. LinGC (1982) and WatsonAR (1985) pointed out that the underestimation of drilling torque and axial force was due to chip evacuation interference, a finding that eventually led to the creation of the unit-tool nonlinear synthesis method, also using analytical methods to establish complex Cutting force models for edge drills are possible. WangJL (1994) studied the chip removal interference in the cutting process, and established the cutting force model of an arbitrary edge drill based on the empirical unit tool bevel cutting force model by applying the unit tool nonlinear synthesis method. In addition to the basic geometry of the drill, many factors in the drilling process can affect the drilling force. In 1996, Chandrasekharan V et al. considered the influence of drill manufacturing and sharpening errors, such as the contour of the two main edges, radius error, axial deflection, etc., and established a complete three-dimensional cutting force model of the tapered drill. It is extended to predict the cutting force of arbitrarily shaped drill-point drills (such as cluster drills). SriramR established a model for predicting the radial force of drilling under the condition of considering the influence of bit sharpening and installation error on the drilling force. In 2001, GongYP and EhmannK established a micro-hole drill axial force, torque and radial force, which comprehensively considered the influence of drill geometric characteristics, grinding and installation errors, and drill deflection on the dynamic cutting thickness and cutting area of u200bu200bthe main and chisel edges. force model.