A Study On Milling Technology Of Large Diameter Non-standard Internal Thread And Tool Design

Large diameter non-standard threaded connections have important functions in heavy machinery,aerospace,military equipment,ships and other fields,and are often used as special connection structures for some large equipment.The processing of large diameter non-standard threads is very difficult,especially for internal threads.Affected by the workpiece structure and the particularity of the thread profile,the traditional turning and tapping methods have problems such as difficulty in clamping,low efficiency,and high processing costs,which greatly limit the production and application of large-diameter non-standard internal threads.At present,with the rapid development of NC machining technology,milling internal thread technology has become a feasible and efficient method for processing large-diameter non-standard internal threads,but its processing technology is not perfect.The determination of milling schemes and milling parameters The selection of milling tools and the design of milling tools do not yet have a complete theory.Therefore,this topic focuses on a typical large-diameter non-standard internal thread for milling processing technology and tool design research.It mainly includes the following three aspects:1)Analyze the milling principle and processing technology of large-diameter non-standard internal threads.Select a reasonable milling processing scheme,carry out the theoretical analysis of the internal thread surface roughness and the internal thread milling overcut residue under this scheme,and establish a related mathematical model.Design a large diameter non-standard internal thread milling tool system to meet the processing requirements of large diameter non-standard internal threads.2)Using UG for NC programming and post-processing of large diameter non-standard internal thread milling process,based on VERICUT software to build a virtual processing environment for large diameter non-standard internal thread milling process,and for large diameter non-standard internal thread milling process Perform simulation experiments.The overcuts,residues and internal geometry of the internal thread surface after the simulation are analyzed to determine the feasibility and rationality of the milling process.3)Using Deform to simulate the cutting of large diameter non-standard internal threads by thread milling cutters.The effects of cutting angles such as tool rake angle,tool rake angle,cutting edge radius,cutting speed,feed per tooth,and radial cutting depth on cutting force and tool wear were studied by orthogonal experiments.As a result,the design of milling tools for large diameter non-standard internal threads is further improved,and the milling process for large diameter non-standard internal threads is optimized.