Research On Manufacturing Technology Of Thin-walled Parts Of RCF105 Metal Based On Laser Claddding

At present,thin-walled parts have been widely used in daily life,but the traditional processing methods have problems such as low material utilization rate and large shape error after processing.The laser cladding-based thin-walled part manufacturing technology,that is,the direct laser manufacturing technology,is an emerging advanced manufacturing technology of additive manufacturing.Since the machining process is designed by computer CAD and then imported into the working robot to directly perform the cladding processing work,the overall processing process of the cladding member is more controllable,ensuring less loss of raw materials and high precision of the work piece.This paper focuses on the research of laser cladding thin-walled parts using iron-based powders,and analyzes the specific processing technology of laser cladding various thin-walled parts.The main research contents of the thesis include:(1)Based on Fe105 metal powder,single-layer single-factor experiment and orthogonal test were carried out to analyze the processing factors:laser power,powder feeding speed,scanning speed and shielding gas flow rate for processing single-layer cladding parts.The optimization parameters were selected,At the same time,the numerical analysis of the results of the orthogonal experiment shows that the influence of each processing factor on the melting height,melting width and the shape factor of the cladding of the laser cladding.(2)Based on the data obtained from the single-pass single layer,a single-layer multi-layer cladding test was performed.Since the thin-walled members are divided into straight-walled thin-walled members and annular thin-walled members.Firstly,for the analysis of straightwalled thin-walled parts,the optimal cladding method and the ?z value are discussed in two kinds of cladding methods and under three different Z-axis lifting amounts ?z.The optimization is carried out by means of the overall cladding effect,the section analysis and the shape factor of the overall thin-walled part.It is de-termined that when ?z=0.197 mm,the reverse lap joint method is adopted,and the obtained thin-walled member has the best quality.For the ringshaped thin-walled parts,the scanning trajectory is first optimized,and the optimized scanning trajectory is divided into two types:forward direction and reverse direction.Similarly,an experimental test using two cladding methods and three different Z-axis lift amounts ?z was used.Finally,it is found that when the same direction thermal bonding method is adopted,and the ?z=0.197 mm under the theoretical optimal lifting amount,the thin-walled parts subjected to cladding are the best in forming quality.(3)For the thin-walled parts of the laser cladding inclined surface,firstly,three different thin-walled parts are theoretically designed:straight-walled inclined thin-walled parts,thinwalled parts with arcs inclined inward,and arcs inclined outward.The theoretical mathematical model of thin-walled parts is simulated by MATLAB software.It is concluded that the limit angle of the thin-walled parts inclined inward is the largest,and the limit angle of the thinwalled parts inclined outward is the smallest.(4)In the process of laser cladding the inclined surface,the height,width and shape coefficient values of the corresponding thin-walled parts are obtained,and then the obtained data is analyzed by means of variance to obtain the horizontal offset amount for the whole.The conclusion that the cladding has a large influence.The horizontal offset has a greater influence on the height stability of the cladding than its width stability.At the same time,under the same inclination angle,the influence of the arc-shaped inwardly inclined thin-walled member is the smallest,and the influence of the arc-shaped outwardly inclined thin-walled member is large,and a series of conclusions about the laser cladding thin-walled member are obtained.