基于加工中心的小螺孔冷挤压工艺研究
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摘要
为满足电子产品小型化、轻量化、高可靠等要求,产品螺纹孔规格逐步变小。但在小螺纹孔的加工过程中,工艺参数选择不当将会导致丝锥折断、底孔偏大、螺纹滑扣以及工件报废等异常情况。为此,以铜合金为例,采用在加工中心实际加工的手段对工艺路线、刀具选型、冷却液浓度及攻丝用时等因素进行了研究,分析攻丝过程机床主轴负载变化情况,通过改进工艺路线、分析推算底孔直径公式、冷却液浓度、主轴转速及选择刀具型号,最终得到了合理的工艺路线及优化切削参数。
To meet the miniaturization,lightweight,high reliability and other requirements of electronic products,product threaded hole specifications gradually become smaller. However,in the processing of small threaded holes,improper selection of process parameters will lead to broken taps,bottom hole is too large,thread skid and parts scrapped and other anomalies. So take copper alloy as an example to study the process route,tool selection,coolant concentration and the time of tapping and other factors by means of actual machining in the machining center to analyze the changes of spindle load during tapping,through the improvement of the process route,analysis and calculation of bottom hole diameter formula,coolant concentration,spindle speed and tool type selection,a reasonable process route is finally obtained and the cutting parameters are optimized.
To meet the miniaturization,lightweight,high reliability and other requirements of electronic products,product threaded hole specifications gradually become smaller. However,in the processing of small threaded holes,improper selection of process parameters will lead to broken taps,bottom hole is too large,thread skid and parts scrapped and other anomalies. So take copper alloy as an example to study the process route,tool selection,coolant concentration and the time of tapping and other factors by means of actual machining in the machining center to analyze the changes of spindle load during tapping,through the improvement of the process route,analysis and calculation of bottom hole diameter formula,coolant concentration,spindle speed and tool type selection,a reasonable process route is finally obtained and the cutting parameters are optimized.
引文
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[2]苏. M明沙柯夫.挤压丝锥[M].北京:国防工业出版社,1983.
[3]王先逵.机械加工工艺手册[M].北京:机械工业出版社,2007.
[4]潘芳伟.冷挤压高强钢抗疲劳性能研究[J].铸造技术,2016(7):1452-1455.
[5]王宏睿,张杰.基于DEFORM-3D的振动挤压螺纹扭矩的数值模拟[J].制造技术与机床,2011(2):90-93.
[6]马冬.挂钩轴内螺纹冷挤压成形[D].重庆:重庆大学,2004.
[7]孙训方,方孝淑,关来秦.材料力学[M].北京:高等教育出版社,2001.