The Accuracy Analysis And Improved Design Of Turbocharger Nozzle Component

The goal of the automotive industry is changing to the direction of highperformance, low fuel consumption and low emissions. The turbocharger couldimprove the power of engine and reduce the emissions of harmful gas by improvingfuel combustion. The turbocharger is the only way to increase engine’s output powerunder the condition of efficiency unchanged. It has a huge market demand. Nozzlering vane as key components of turbocharger components, precision machiningquality directly affects the performance of the turbocharger. Today, There is nospecial equipment to machining nozzle ring vane in China. The current machiningmethods have the problem of low accuracy, poor stability and consistency. This topiccombined with market needs, reference to the principle of centerless grinding,designed and prototyped a special grinder to machining nozzle ring vane. However,the existing grinding machining could not guarantee accuracy, stability andconsistency. This thesis analysis of the accuracy error of the workpiece through trial.We are trying to find the reason of accuracy error and design some parts of thestructure to improve the processing performance of the special grinder.The content of this article is:(1) The analysis of external precision error. Including: outer dimensions areinconsistent; the original error of cylindrical workpiece, the accuracy of indexingwheel, limit sets, the impact of the accuracy of the machine installation; the analysisof cylindrical workpiece error.(2) The analysis of end vertical error: the unbalanced force on workpiece, theinstallation affect of cross slide, the impact of these factors on the end face ofverticality.(3) Select the appropriate wheel to machine cylindrical and end face. Focus oncombine with the requirements of precision to select the appropriate wheel size, andrefer to the angle of platen to design the shape and size of bowl-shaped grindingwheel. Avoid interference with the platen when machining the end face of the blade.(4) Reselect the mechanical slide to assemble the external circular grinding part, the end face grinding part and the platen. Considering the economy andinterchangeability, we try to select outsourcing standard slide. Calculating theimportant parameters of cylindrical grinding. Using the spindle on the end facegrinding part to improve the efficiency and reliability of grinding, simplify thestructure and reduce the noise. the redesign of stand of platen to make it more lighter.(5) On the basis of rigidity, redesigning the dresser of grinding wheel andre-layout the components of the machine.(6) On the basis of the redesign of processing equipment, we redesigned the bedof the machine. By the analysis of static and modal to verify if the improved bedcould meet the processing requirements. In order to maximize the material of the bed.we did topology optimization of the bed based on the improved bed to determine theoptimum size of the bed.