Control Method Of Laser Cladding For Die-cutting Edge Of Curved Surface

This study established the model between the input of curved surface laser cladding processing parameters and the output of geometric characteritics of the product,according to the complex spatial trajectory and the requirement of high dimensional and geometrical precision rotary die-cutting tools and special-shaped tools.This model reveals the relation between the processing parameters and the processing product,which guides the process implementation in the restoration and remanufacturing of curved shape parts.The forming control and prediction of the“curved surface with curved path” laser cladding was achieved,which had a significant contribution to the research “curved surface parts with curved path” laser cladding.In order to study the forming control mechanism of rotary die cutting tool laser cladding,a combination of experimental and theoritcal methodologies was conducted.First,central composite design(CCD)module in response surface methodology was applied to investigate the influence of the laser power,scanning speed,gas flow and radius of the cylindrical substrate on the width,height and dilution rate of the single-track cladding layer in “curved surface with curve path” laser cladding.This discovery explained the complex process of “laser-powder” energy coupling effect during the curved surface laser cladding with curved path,which effectively revealed the relation between processing parameters and the geometric characteristics of the cladding layer.By obtaining the optimized processing parameters,the control and prediction of the single track laser cladding with single layer on the curved surface with curved path was achieved.Then,the effect of the cylindrical subatrate radius on the single track cladding layer was revealed.The models of displaying the influence of cylindrical subatrate radius on cladding efficiency,porosity and grain size in single track cladding layer were established.The optimum radius of the cylindrical subatrate was 35-40 mm,which provided theoretical basis for large-area restoration and remanufacturing of cylindrical die-cutting tools.Finally,a single clad layer was prepared on a 40 mm radius cylindrical subatrate with multi-track laser cladding.The laser power,scanning speed,gas flow and overlapping rate were selected as input variables,flatness ratio,incomplete fusion and pore area were output indicators.Establishing a functional relationship between the input variables and the output indicators was to realize the control and prediction of the single clad layer made by multi-track laser cladding with“curved surface with curved path”.The results provides theoretical basis for the mechanism and control method of laser cladding technology with complex curve trajectory on curved surface.It can be applied to the complex spatial curve trajectory coating industry,cladding and cutting hybrided manufacturing for curve and rotary cutting tools,special-shaped tools,complex-shaped industrial-specific tools,etc.The research method provided theoretical support for the complex shape curve trajectory laser cladding manufacturing technology.