Calculation method for grinding track of rear tool face of straight edge of drill tip

Abstract

The invention discloses a drill tip linear blade flank grinding track calculation method, and the method specifically comprises the steps: firstly, defining the structural parameters of a drill tip linear blade flank, and establishing a mathematical model of a drill tip linear blade line and the flank; secondly, defining a coordinate system of a drill tip linear blade rear tool face and a grinding wheel reference grinding posture; on the basis, adopting a coordinate transformation matrix to describe the motion mode of the grinding wheel, and by means of the kinematics principle, deducing a grinding wheel grinding position and posture calculation method based on a workpiece coordinate system. The calculation method has the advantages of being good in structural parameter adaptability, high in track coordinate precision, flexible in grinding wheel posture adjustment and the like, simulation machining verification is carried out, and the effectiveness of the algorithm is verified.

Description

technical field [0001] The invention belongs to the technical field of drill bit structure design and numerical control grinding technology, and in particular relates to a method for calculating the grinding trajectory of the flank flank of a straight edge of a drill tip. Background technique [0002] As a vital part of the drill bit, the drill tip undertakes the main cutting task during the drilling process [1]. The geometric characteristics of the drill tip have a great influence on the cutting performance of the drill bit, and a small change in its geometry may cause a large change in the drilling performance of the drill bit [2]. The flank structure of the drill tip is obtained by grinding on the drill edge, and different flanks can be obtained by using different relief angles. When the drill tip is working, each flank face is involved in the drilling process, so that the force direction of the chips is different and the centering performance of the drill bit is improve...

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Problems solved by technology

For example, Sun Xiaojun et al. [4] proposed a ball end mill flank machining algorithm, and carried out processing verification; The new method of twist drill flank is realized by wire cutting instead of grinding wheel, but the pulse interval has an impact on the flank roughness formed by wire cutting, and it cannot be accurately controlled; Huang Qifeng et al.[6 ] to study the influence of flank wear on axial force during high-speed drilling, and then the axial force signal increases with the increase of flank wear, and the fluctuation range is large; the average axial force increases at a rapid rate first, and then increases slowly. Finally, it increased sharply; Fang Chen et al. [7][8] established a drill bit model using 3D software, and used the cone sharpening meth

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