摘要盖形螺母，包括螺母体和盖帽，其技术解决方案是螺母体和盖帽为分体结构，两者通过焊接连接。采用分体结构后，螺母体可采用现有的标准螺母，加工时只需制造盖帽并将盖帽焊接在标准螺母上就可以了，大大降低了制造的难度。盖形螺母广泛应用于汽车配件，机械设备，电子器材，通讯设备，五金灯饰，建筑桥梁，家具装修等相关行业，其市场需求量巨大。采用冷挤压工艺生产不但能降低生产成本，提高生产效率；而且提高了零件的精度和表面质量，改善了强度和韧性，减少了切削加工量，也改善了零件的组织性能。所以，在此对汽车盖形螺母的成形工艺及模具设计进行研究。在挤压过程中一般采用有预成形的多道次挤压工艺。其中的关键是如何合理分配材料变形程度，控制材料流动，减少过度变形，从而得到合格的零件。本文探讨了盖形螺母挤压的可行性，通过对产品零件图的分析，制定了几种工艺方案并进行分析比较，在选择最优方案的同时也制定了工艺流程。在此基础上详细地介绍了盖形螺母挤压模具的设计过程。关键词：盖形螺母，冷挤压，模具设计，成形工艺ABSTRACTCapnut,includingnutbodyandcap,thetechnicalsolutionisthenutbodyandcapforfissionstructure,boththroughweldingconnection.Afteradoptingfissionstructure,nutnutcanadoptexistingstandardsbody,onlywhentheprocessingmanufacturingblocksandblocksofweldingonthestandardnut,greatlyreducethemanufacturingdifficulty.Capnutiswidelyusedinautoparts,machineryandequipment,electronicequipment,communicationsequipment,hardwarelighting,bridgebuilding,furnituredecorationandotherrelatedindustry,itsmarketdemandishuge.Notonlycanreducetheproductioncostwasproducedbycoldextrusiontechnology,improveproductionefficiency;Andimprovestheprecisionandsurfacequalityoftheparts,toimprovethestrengthandtoughness,reducethecuttingprocessingcapacity,andimprovetheorganizationalperformanceoftheparts.So,inthisforcarcovernutformingtechnologyanddiedesignwerestudied.Preformiscommonlyusedintheextrusionprocessofmulti-channelextrusionprocess.Thekeyishowtodistributethematerialdeformationdegree,reasonablecontrolofmaterialflow,reduceexcessivedeformation,soastogetqualifiedparts.Thispaperdiscussesthefeasibilityofcapnutextrusion,throughtheanalysisoftheproductdetaildrawings,makeseveralprocessschemeandcarriesontheanalysiscomparison,inchoosingtheoptimalplanisalsomadetheprocessflow.Onthebasisofthecovernutwereintroducedindetailthedesignprocessoftheextrusiondie.Keywords:capnut,coldextrusion,diedesignandformingtechnology目录TOC\o"1-3"\u第1章冷挤压技术的介绍PAGEREF_Toc169929022\h11.1冷挤压工艺的实质PAGEREF_Toc169929023\h11.2冷挤压工艺的优点PAGEREF_Toc169929024\h11.3冷挤压工艺的缺点PAGEREF_Toc