Research On Oxygen-free Copper Deep Hole Processing Technology

Oxygen-free copper materials are widely used in the field of electronic information transmission because of their excellent electrical and thermal conductivity,no hydrogen embrittlement,good ductility,and corrosion resistance.However,due to its large plasticity and low strength,problems such as chip blocking,hole axis deflection,and surface integrity often occur during deep hole processing,making it difficult to be widely used.At present,there are few studies on deep hole processing of oxygen-free copper materials at home and abroad,so this subject takes oxygen-free copper as the research object to study its deep hole processing technology.First of all,according to the analysis of the physical properties and cutting performance of oxygen-free copper materials,combined with the structural requirements of parts,a process route for deep-hole processing of oxygen-free copper materials is formulated.Secondly,analyze the difficulties of oxygen-free copper deep hole machining,select BTA deep hole machining system,and study the breaking mechanism of deep hole chips,and design a special internal chip removal deep hole drill bit for the characteristics of oxygen-free copper material with high plasticity.Thirdly,the DEFORM three-dimensional simulation software was used to simulate the drilling process.The experiment showed that as the feed rate increased,the axial force and torque increased greatly;as the radius Rn of the chip breaker groove increased,the chip bending The radius is significantly increased;the main wear of the tool is mainly on the cutting edge and rake face.Using ANSYS analysis software to perform dynamic analysis on drill rods with different drilling depths to obtain the natural frequency and deformation form of the drill rod.In order to prevent the resonance of the drill rod,try to avoid the resonance frequency at 6Hz,12Hz,18Hz,24Hz,48Hz,Processed at 54Hz.Finally,the deep-hole drilling and boring test of oxygen-free copper material was conducted.Through the comparison of the results,it is found that when the arc radius of the chip breaker Rn=0.9mm,the rotation speed n=255r/min,and the feed amoun f=0.05mm/r,the deep hole machining of the oxygen-free copper can obtain the ideal chip and the processing effect good.Deep hole boring has a certain deflection effect on the axis of the deep hole and improves the surface quality of the inner hole.This subject proves the feasibility of the process through experiments and is applied to the actual production of oxygen-free copper,which provides a reference for the deep hole processing of oxygen-free copper in the future.