| As a kind of metal surface strengthening process,electrospark deposition(ESD)has been promoted rapidly in the field of re-manufacturing field in recent years due to it’s unique technological advantages.However,the traditional ESD process is carried out by hand,which results in the uncontrollability of the deposition process and the poor accuracy and reproducibility of the deposition coatings.Moreover,it can not achieve the precise preparation of the planar and spatial complex curve coatings in the industrial production.The emergence of the electric spark-computer integrated deposition system(ES-CIDS)realizes the numerical control of the traditional ESD.The experimental results of the spot welding pattern deposition strategy(SWP-DS)prove that the electrospark-computer numerical control deposition(ES-CNCD)process can prepare homogeneous complex planar and spatial curve coatings.However,SWP-DS has more empty travels during the deposition process so that the deposition efficiency needs to be further improved.Based on the ES-CIDS,a new deposition method-continuous constant gap deposition strategy(CCG-DS)is proposed on the basis of the SWP-DS due to it’s more empty travels.During the experiment of the discharge gap in the deposition method,the CoCuFeNiCr high entropy alloy electrode and YL12 aluminium alloy are selected.It is found that when the deposition voltage is 80 V,the 0.13 mm is chosen as the discharge gap can ensure the deposition process be the most stable.The electrode length consumption law is obtained by the preparation of line coatings on YL12 aluminium alloy by using a CoCuFeNiCr high entropy alloy electrode.Combining the electrode length consumption law with the parametric programming,the computer numerical control deposition G codes are outputted based on Matlab.Based on the ES-CNCD process,the stable microstructure of the high entropy alloy coatings(HEAC)by the method of SWP-DS have been successfully prepared.In order to verify the feasibility of the CCG-DS,using the CCG-DS and the SWP-DS to prepare the coatings on the 45 steel substrate with the CoCuFeNiCr electrode under the same experimental conditions.Researched and Compared the surface morphology and phase composition of HEAC which got in two deposition strategies by X-ray diffraction,electron microscope,proved that the CCG-DS can be used to prepare the coatings with the same structures as the SWP-DS even the efficiency of the CCG-DS is increased by more than 5times in contrast to SWP-DS.The CCG-DS provides a high efficiency preparation approach for the high energy micro arc spark computer numerical control deposition process.The planar and spatial NURBS curve coatings are successfully prepared by SWP-DS based on the ES-CIDS,and the NURBS mapping projection curve(NURBS-MPC)is proposed.In order to prove the feasibility of the CCG-DS,using non-uniform rationalB-spline(NURBS)to depict planar complex curves and surfaces at first.Secondly,under the circumstances of ensuring the continuous constant gap between the electrode and the matrix,matlab software is used to program the numerical control program which uses the equal-arc length interpolation to achieve the NURBS curve coatings on the plane by using the CCG-DS.Next,based on the NURBS-MPC,the pre-designed NURBS curve is projected onto the NURBS surface and the coatings are deposited on the surface by using the CCG-DS and the equal-arc length interpolation respectively.Finally,the planar NURBS curve coatings and the NURBS-MPC coatings are successfully prepared based on the ES-CIDS,which proves the feasibility of the CCG-DS. |
