Study On Electroless Copper Plating Technology Of Wood-Plastic SLS Parts And Its Application

Selective Laser Sintering(SLS)is a kind of Additive Manufacturing technology,which integrates computer-aided CAD technology,laser processing technology,numerical control technology and material science.It can quickly and efficiently process complex shapes of three-dimensional solid models without tool fixture,with high utilization of materials,short production cycle,low cost and other advantages with the world's attention.Many kinds of materials can be used for selective laser sintering,but the high cost of materials constrain SLS technology development.The wood-plastic composites used in this paper are a new type of biomass material composites of agro-forestry waste powders,PES hot melt powders and a small amount of additives.It has the characteristics of wood and macromolecule materials,and has excellent mechanical properties and size stability,the workpiece has a wooden appearance and low cost.The SLS forming experiment was carried out on the wood-plastic composites,and the surface quality was improved by waxing infiltration and resin infilitration to protect the substrate from damage during the subsequent electroless copper plating.In this paper,the SLS forming experiment of wood-plastic composite powder is studied.The influence of different process parameters on the surface roughness of wood-plastic SLS parts is analyzed by orthogonal experiment.The laser power,scanning speed,scanning distance and stratified thickness Four process parameters on the surface roughness of the workpiece have a certain impact.In addition,it has been found that the waxy and infiltration resin treatment of the wood-plastic SLS parts protects the substrate from damage during subsequent electroless copper plating.The surface of the wood-plastic SLS parts has a certain degree of roughness and can not be roughened during the subsequent electroless copper plating process.And then proposed for the wood-plastic SLS parts of the electroless copper plating.Electroless copper plating gives wood-plastic material metallic luster,improves material fineness,and imparts conductive properties to wood-plastic materials.From the basic principle of electroless copper plating,after the chemical copper plating liquid formula and the technological condition were determined,the silver ammonia activation and electroless copper plating were carried out after the waxy and seepage resin treatment of the wood-plastic SLS parts,respectively.Metal luster of the dense copper coating,and studied the bath temperature,time and other process parameters on the thickness of the coating.The microstructures of the resin parts were observed by SEM,and the bonding strength between the coating and the wood-plastic substrate under different treatment methods was evaluated by the cross-cutting experiment.It was found that the copper coating with better performance could be obtained.The coating strength of the coating layer and the substrate was measured and analyzed.The surface resistivity of the coating was tested and the coating had electrical conductivity.Finally,it is proposed that the wood-plastic SLS process is combined with the electroless copper plating process in electrochemical processing.The stainless steel SLS parts were processed by electroless copper plating on electrochemical deburring tool electrodes,and electrochemical deburring of aluminum plate drilling burrs was carried out by using the tool electrodes.The electrochemical deburring experiment was carried out to verify the feasibility of making the electrode for electrochemical processing tool after electroless copper plating of wood-plastic SLS,and extended the application field of wood-plastic material SLS.