Research On The Key Technology Of Inner Whirlwind Milling In The Screw And The Kneading Block

Screw-type parts is very important class of machine parts,wide range of applications,more involved in the industry,occupies a large proportion of the processing machinery manufacturing.Parts of the screw machining,turning conventional molding method because of low productivity,low precision,high molding tool costs,long production lead time and other shortcomings,making it difficult to do further research;ball-cutter milling method because they do not for small screw machining grooves and the outer disc cutter whirlwind enveloping milling due to the rigidity and poor reasons that its limited range of applications.With trays whirlwind milling cutter screw-type parts has become the consensus of the industry.Engaging block is a kind often used in conjunction with the screw parts in the extruder and the extruder important part,because of its special shape,mainly working on the vertical machining center or CNC milling machine,inefficient and costly.In this context,the proposed key technology research and screw the ring plane of the block whirling.Within Whirling technique is used on CNC machine tools,through the disc cutter and workpiece Neiqie Jia workers workpiece method.Different from ordinary disc cutter within whirlwind cutter is a hollow in the middle of the disc crutter.How to upload cutter tool,cutter tool direction toward the center of rotation.When machining a workpiece,the workpiece from the inside through the cutter,the inner cutter to achieve workpieces through the inner-cut.In this study,newly designed screw and the ring block whirling plane has four axes:the rotation of the workpiece,the cutter in the horizontal plane translational(X,Z-axis direction of movement)and the X-axis rotation knife wound.In function,not only can realize the processing screw,but also engaging block processing,the original on different machining two parts,and now through a machine processing can be achieved,to achieve "A multifunction machine." In terms of performance,greatly improving the processing efficiency and quality of the screw and the engaging block material removal process can be achieved lhen the screw 591m3/s,the processing time of only a single screw conventional processing methods 1/5-1/4,the surface roughness can be controlled to Ra1.6 less.Processing time of the engagement block monolithic 9.375 seconds,compared with the milling machining centers engagement block efficiency by 2 times,the most important is to reduce equipment requirements,saving equipment costs.In this thesis,the overall scheme of the screw and the inner whirling plane engagement block,intermal whirling power head emphatically design,supplemented by its computer modeling,analysis,optimization.In order to reduce the difficulty of programming CNC milling machine in the whirlwind,based on MATLAB/GUI developed a screw and engaging auxiliary processing block CAM system.Enter through the system screw or engagement block geometric parameters,the system will automatically generate a screw or engagement model block,comprising:a screw orcnd engagement block-shaped cross-sectional profile of the shaft cross-section profile shape and three-dimensional graphics.Then enter the cutter parameters,the system will automatically generate the machine tool positions according to part model.CAM cutter location point information generated by the system only slight modifications can be introduced into the numerical control system to reduce the difficulty of programming the workers and improve programming efficiency.This thesis consists of six chapters:Chapter 1,project background and content.The type of processing methods and their respective screw and the engaging parts of the block in the current research were introduced.Made screws and intermal whirling engagement block”one body,concept,and significance of the research and the main content is introduced.Chapter 2,the inner screw and the engaging block whirling plane theoretical basis.Within introduce mathematical theory based whirling milling,including the establishment of a mathematical model of the workpiece,the tool coordinate system and the establishment of a mathematical model of the tool to the machine coordinate system conversion,eubic spline curve fitting,a screw and the ring block whirling plane design laying the groundwork..Chapter 3,whirling plane design within the overall design and the power head.The chapter on the whole inside of the screw and the engaging block whirling plane overall program design,detailed design through theoretical calculations within the whirling power head,combined with ANSYS software to mount power head of the stress and strain analysis,modal analysis and structural optimization.Chapter 4,based on MATLAB/GUI CAM system development.This chapter combine mathematical theory of Chapter ?,proposed a screw and engaging knife block sites algorithm based on MATLAB/GUI developed an auxiliary processing screw and the engaging block CAM system.Respectively,the theoretical residual height of the screw and the engaging block processed for analysis.Through theoretical residual engagement block after processing height analysis found:the use of feed and other theoretical step angle machining engagement block remaining highly unstable,it will seriously affect the quality of the engagement process block.Knife block sites engaging solving optimization,knife and other proposed sites arc feed machining engagement block algorithm.Chapter 5,Experimental study on the screw and the engaging blocks within whirling jet cutting.The chapter with plastic extruder screw to full engagement and the engagement block,for example,the input parameters to the CAM system then generates cutter location point and then imported CNC machine tools and machining screw engagement block,within this test whirling theory,feasibility CAM systems and internal whirling machine envelope.Single factor test method to study cutting speed,depth of cut,the number of knives on the quality of the screw machining,electrical power,in order to achieve inner screw Whirling optimum parameters.Test get:When the number of the tool is 4,the depth of cut 0.08mm,when cutting speed 200m/min,the surface roughness of the workpiece machining lowest processing more efficient.Chapter 6 of the research work done in this paper is summarized,and the future research direction of this paper presents insights of ideas.