Development of Drill and Drilling Research (4)

In addition to the basic geometry of the drill bit, many factors in the drilling process can affect the drilling force. In 1996, Chandrasekharan V et al. considered the manufacture of the drill bit and the sharpening error such as the contour of the two main edges, the radius error, the axial deflection, etc., and established a complete three-dimensional cutting force model of the tapered bit, followed by Extend it to predict the cutting force of any shape drill bit (eg group drill). Sriram R established a model for predicting the radial force of drilling while considering the influence of drill sharpening and installation error on the drilling force. In 2001, Gong YP and Ehmann K established a micro-hole drill axial force, torque and a comprehensive consideration of the geometry of the drill bit, sharpening and installation errors, and the influence of bit deflection on the dynamic cutting thickness and cutting area of ​​the main and chisel edges. Radial force model.

3.3 Drilling force modeling method With the advancement of technology, the method of establishing a predictive drilling force model is also developing. In 1997, Islam AU and Liu MC proposed a method for predicting the axial force and torque of group drills using artificial neural networks. The training data was extracted directly from the literature. In 2001, Kawaji S et al. also proposed a method for estimating and controlling the axial force of drilling using a neural network model: 1 constructing an axial force neural network model offline; 2 based on the model, training through online least squares method , to establish a simulated neural controller; 3 to apply a trained neural controller to the drilling system to obtain axial force. In 1999, Chen Y applied the finite element method to analyze the bevel cutting process of a tool with a cutting edge radius, and established a drilling force model of any blade bit calibrated with a finite number of arbitrary edge drills. In 2004, Strenkowski JS et al. used an Euler finite element model to simulate the cutting force of a unit tool that forms a cutting edge, and proposed a method for predicting the axial force and torque of a twist drill using finite element techniques. In 2002, Yang JA et al. proposed a simulation model of drilling process realized by I-DEAS CAE software system, which can predict dynamic drilling force.

4. Research trends
(1) Drilling process modeling has become a research hotspot affecting various factors of the drilling process, including bit geometry, manufacturing and installation errors, physical properties (static and dynamic characteristics), cutting conditions, ambient temperature, workpiece size and materials, etc. Will gradually be included in the scope of modeling research, various drilling types, cutting conditions and drilling process related drilling power, drilling temperature, bit wear and life, chip deformation and discharge, drilling quality, drilling efficiency and drilling Cutting costs, etc. will become the object of modeling the drilling process, the modeling method will be more diversified, the accuracy of the model prediction will be further improved, the drilling model will not only be used for simulation and forecasting, but will be used more for guidance. Optimization and monitoring of bit design, manufacturing and drilling processes.

(2) The geometric design and manufacturing method of the drill bit will remain the focus of research. New drill types suitable for processing various materials and processing conditions will continue to emerge. Research on micro-drills for micro-machine manufacturing and printed circuit board manufacturing will move toward In-depth. The research on the manufacturing method of the drill bit will be developed in the direction of the integrated manufacturing system. The automatic sharpening problem of the drill bit, especially the group drill, will be solved, and the integration, automation and intelligence of design and manufacture will be paid special attention.

(3) The research on drilling mechanism will be gradually paid more attention to the research on the drilling mechanism and the drilling mechanism research. The research on drilling mechanism is the bottleneck restricting the research of drill bit and drilling technology; drilling is the most complicated One of the cutting processes, and basic research on the cutting principle will inevitably shift from relatively simple turning machining research to more complex drilling machining research.

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