本文主要研究内容
作者张洁（2019）在《激光切割机床龙门梁动态特性及切割工艺参数研究》一文中研究指出：激光切割凭借传统机械切割方式所不具备的优势,能够实现对复杂结构、高熔点、高硬脆性等金属和非金属材料进行快速切割,在工程机械、汽车制造、矿山机械、玻璃切割、皮革塑料制品等多个行业有着广泛应用。国内激光切割机床的市场需求每年以20%以上的速度增长,但当前国内激光切割机床与国外同类产品还是有一定差距的,在大工作量程、高稳定性和柔性切割的激光切割机床质量和激光切割工艺水平上述还存在很多不足。制造业的快速发展对激光切割机床质量和切割工艺提出了更高的要求,但目前国内激光切割机床设计很多还停留在传统的设计和经验设计层面,现代设计方法运用较少,激光切割精度低、结构设计不合理、强度不足或过度富余、能耗和体积大等问题。同时激光切割范围和切割精度的要求越来越苛刻,对于激光切割质量的评价标准都是根据经验和肉眼观察,关于激光切割工艺参数对切缝宽度、挂渣量、切割断面粗糙度的影响规律模型的研究较少。因此合理设计和系统分析龙门式激光切割机床的静动态特性及关键零部件的受力状态,对龙门式激光切割机床的研制和性能提升很有必要,同时数值模拟各激光切割工艺参数对镁合金切割质量的影响对提升激光切割镁合金的质量和推广镁合金的应用也有重要意义。本课题针对龙门式激光切割机床和切割工艺参数存在的问题,开展的主要研究内容如下:(1)龙门式激光切割机床三维模型的创建。在分析机床结构和工作装置组成部分的基础上,查阅龙门式机床的相关资料和参数,在Creo中创建龙门式激光切割机床的床身、龙门梁等关键部件,并对机床上的各导轨、丝杠和电机进行校核和计算,最后完成整个龙门式机床的装配。(2)龙门式激光切割机床的有限元分析。研究龙门式机床的实际工况和受力分析,将创建的三维模型导入到ANSYS分析软件中,创建机床床身、龙门梁的有限元模型,然后对激光切割机床的床身、龙门梁的力学分析、模态分析及龙门梁优化分析。有限元分析结果表明机床床身及龙门梁最大变形量分别为0.140E-4mm和0.0107mm,均满足设计要求。床身及龙门梁最大应力分别为10.2MPa和12.906MPa,远小于Q345碳钢的许用应力。机床床身及龙门梁模态分固有频率远大于工作频率,表现出了极大的刚度并存在一定优化的空间。(3)激光切割镁合金工艺参数数值模拟。采用ANSYS软件数值模拟研究了激光切割AZ91镁合金在不同工艺参数的温度场分布,综合考虑了镁合金切割过程非线性的热物性参数、移动体热源加载及实际工况相符合的边界条件等,通过软件命令流编程实现移动高斯体热源循环加载。根据分析不同激光功率、切割速度、光斑直径下的激光切割温度计算结果,确定了功率、速度和光斑对镁合金切割温度场的影响规律,当切割功率在700W、速度在30mm/s时有最小的切缝宽度和最佳的温度场分布。(4)激光切割镁合金实验。在数值模拟和理论分析的基础上开展了镁合金激光切割试验,研究了不同激光功率、切割速度、焦点位置和辅助气体压力下的镁合金激光切割。分析了激光切割的镁合金切缝宽度、切缝形貌、挂渣量、断面粗糙度及切缝金相组织。得出当激光功率为750W、切割速度为27mm/s、焦点位置为-2mm、辅助气体压力为0.45MPa时,切缝宽度最小且切缝处平滑光整,此切割参数下切割质量最佳。本论文开展的激光切割机床和激光切割工艺参数研究,立足实际激光切割工况,对提升机床产品质量和优化切割工艺参数具有较好实践意义和应用价值。
Abstract
ji guang qie ge ping jie chuan tong ji xie qie ge fang shi suo bu ju bei de you shi ,neng gou shi xian dui fu za jie gou 、gao rong dian 、gao ying cui xing deng jin shu he fei jin shu cai liao jin hang kuai su qie ge ,zai gong cheng ji xie 、qi che zhi zao 、kuang shan ji xie 、bo li qie ge 、pi ge su liao zhi pin deng duo ge hang ye you zhao an fan ying yong 。guo nei ji guang qie ge ji chuang de shi chang xu qiu mei nian yi 20%yi shang de su du zeng chang ,dan dang qian guo nei ji guang qie ge ji chuang yu guo wai tong lei chan pin hai shi you yi ding cha ju de ,zai da gong zuo liang cheng 、gao wen ding xing he rou xing qie ge de ji guang qie ge ji chuang zhi liang he ji guang qie ge gong yi shui ping shang shu hai cun zai hen duo bu zu 。zhi zao ye de kuai su fa zhan dui ji guang qie ge ji chuang zhi liang he qie ge gong yi di chu le geng gao de yao qiu ,dan mu qian guo nei ji guang qie ge ji chuang she ji hen duo hai ting liu zai chuan tong de she ji he jing yan she ji ceng mian ,xian dai she ji fang fa yun yong jiao shao ,ji guang qie ge jing du di 、jie gou she ji bu ge li 、jiang du bu zu huo guo du fu yu 、neng hao he ti ji da deng wen ti 。tong shi ji guang qie ge fan wei he qie ge jing du de yao qiu yue lai yue ke ke ,dui yu ji guang qie ge zhi liang de ping jia biao zhun dou shi gen ju jing yan he rou yan guan cha ,guan yu ji guang qie ge gong yi can shu dui qie feng kuan du 、gua zha liang 、qie ge duan mian cu cao du de ying xiang gui lv mo xing de yan jiu jiao shao 。yin ci ge li she ji he ji tong fen xi long men shi ji guang qie ge ji chuang de jing dong tai te xing ji guan jian ling bu jian de shou li zhuang tai ,dui long men shi ji guang qie ge ji chuang de yan zhi he xing neng di sheng hen you bi yao ,tong shi shu zhi mo ni ge ji guang qie ge gong yi can shu dui mei ge jin qie ge zhi liang de ying xiang dui di sheng ji guang qie ge mei ge jin de zhi liang he tui an mei ge jin de ying yong ye you chong yao yi yi 。ben ke ti zhen dui long men shi ji guang qie ge ji chuang he qie ge gong yi can shu cun zai de wen ti ,kai zhan de zhu yao yan jiu nei rong ru xia :(1)long men shi ji guang qie ge ji chuang san wei mo xing de chuang jian 。zai fen xi ji chuang jie gou he gong zuo zhuang zhi zu cheng bu fen de ji chu shang ,cha yue long men shi ji chuang de xiang guan zi liao he can shu ,zai Creozhong chuang jian long men shi ji guang qie ge ji chuang de chuang shen 、long men liang deng guan jian bu jian ,bing dui ji chuang shang de ge dao gui 、si gang he dian ji jin hang jiao he he ji suan ,zui hou wan cheng zheng ge long men shi ji chuang de zhuang pei 。(2)long men shi ji guang qie ge ji chuang de you xian yuan fen xi 。yan jiu long men shi ji chuang de shi ji gong kuang he shou li fen xi ,jiang chuang jian de san wei mo xing dao ru dao ANSYSfen xi ruan jian zhong ,chuang jian ji chuang chuang shen 、long men liang de you xian yuan mo xing ,ran hou dui ji guang qie ge ji chuang de chuang shen 、long men liang de li xue fen xi 、mo tai fen xi ji long men liang you hua fen xi 。you xian yuan fen xi jie guo biao ming ji chuang chuang shen ji long men liang zui da bian xing liang fen bie wei 0.140E-4mmhe 0.0107mm,jun man zu she ji yao qiu 。chuang shen ji long men liang zui da ying li fen bie wei 10.2MPahe 12.906MPa,yuan xiao yu Q345tan gang de hu yong ying li 。ji chuang chuang shen ji long men liang mo tai fen gu you pin lv yuan da yu gong zuo pin lv ,biao xian chu le ji da de gang du bing cun zai yi ding you hua de kong jian 。(3)ji guang qie ge mei ge jin gong yi can shu shu zhi mo ni 。cai yong ANSYSruan jian shu zhi mo ni yan jiu le ji guang qie ge AZ91mei ge jin zai bu tong gong yi can shu de wen du chang fen bu ,zeng ge kao lv le mei ge jin qie ge guo cheng fei xian xing de re wu xing can shu 、yi dong ti re yuan jia zai ji shi ji gong kuang xiang fu ge de bian jie tiao jian deng ,tong guo ruan jian ming ling liu bian cheng shi xian yi dong gao si ti re yuan xun huan jia zai 。gen ju fen xi bu tong ji guang gong lv 、qie ge su du 、guang ban zhi jing xia de ji guang qie ge wen du ji suan jie guo ,que ding le gong lv 、su du he guang ban dui mei ge jin qie ge wen du chang de ying xiang gui lv ,dang qie ge gong lv zai 700W、su du zai 30mm/sshi you zui xiao de qie feng kuan du he zui jia de wen du chang fen bu 。(4)ji guang qie ge mei ge jin shi yan 。zai shu zhi mo ni he li lun fen xi de ji chu shang kai zhan le mei ge jin ji guang qie ge shi yan ,yan jiu le bu tong ji guang gong lv 、qie ge su du 、jiao dian wei zhi he fu zhu qi ti ya li xia de mei ge jin ji guang qie ge 。fen xi le ji guang qie ge de mei ge jin qie feng kuan du 、qie feng xing mao 、gua zha liang 、duan mian cu cao du ji qie feng jin xiang zu zhi 。de chu dang ji guang gong lv wei 750W、qie ge su du wei 27mm/s、jiao dian wei zhi wei -2mm、fu zhu qi ti ya li wei 0.45MPashi ,qie feng kuan du zui xiao ju qie feng chu ping hua guang zheng ,ci qie ge can shu xia qie ge zhi liang zui jia 。ben lun wen kai zhan de ji guang qie ge ji chuang he ji guang qie ge gong yi can shu yan jiu ,li zu shi ji ji guang qie ge gong kuang ,dui di sheng ji chuang chan pin zhi liang he you hua qie ge gong yi can shu ju you jiao hao shi jian yi yi he ying yong jia zhi 。
论文参考文献
论文详细介绍
论文作者分别是来自中国矿业大学的张洁，发表于刊物中国矿业大学2019-07-18论文，是一篇关于激光切割机床论文,龙门梁论文,有限元分析论文,数值模拟论文,镁合金论文,中国矿业大学2019-07-18论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自中国矿业大学2019-07-18论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：激光切割机床论文; 龙门梁论文; 有限元分析论文; 数值模拟论文; 镁合金论文; 中国矿业大学2019-07-18论文;