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从工件的定位与夹紧方面入手,分析了零件在装夹和加工过程中引起变形的原因,采用零件分类叙述的方法,分析了平面零件的平板及薄壁零件和圆柱类工件以及其他零件在装夹和加工中对加工精度和表面粗糙度的影响,并举出实例,说明此类工件装夹应注意的问题。 相似文献
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薄壁零件具有质量轻、节约材料、结构紧凑等特点,但刚性差、强度弱,不仅装夹容易变形,而且在车削中产生的切削力和切削热都会使零件变形.针对薄壁齿轮零件厚度较薄、加工精度要求较高、加工过程中容易产生变形等问题,对加工工艺进行改进,解决工件的变形问题,保证了零件的加工质量. 相似文献
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秦刚 《机械工人(冷加工)》2012,(9):50-52
机械加工中工件的定位与夹紧经常会遇到装夹变形,所以要解决工件的少无变形装夹。对于薄片状零件(如磁盘等)极易变形,可用真空吸盘来装夹。对于一些小零件可采用液状橡胶、沥青和低温蜡等将零件粘于夹具上进行加工。 相似文献
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何彩颖 《机械制造与自动化》2013,42(3)
铝制薄壁零件具有密度小、成本低、塑性好及易切削等特点,由于其缺口敏感性比较强,不仅装夹容易变形,而且在加工过程中产生的切削力和切削热都会使零件变形.针对铝制薄壁零件厚度较薄、加工精度要求较高、加工过程中容易产生变形等问题,对其切槽的加工工艺进行改进,解决工件的变形问题,保证了零件的加工品质. 相似文献
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杨坚民 《机械工人(冷加工)》1980,(2)
在车床上加工厚度小于10毫米的盘类零件进行二次装夹平头时,往往因零件薄而不易装夹与找正。为此,我们采取了以下方法,使装夹速度有显著提高。其方法就是在三爪卡盘的卡爪上各套一个厚度与卡爪突出部分H尺寸相等的铁环(如图),并用螺钉固定。再按工件的相应尺寸在铁环上预 相似文献
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本文以模型直升机上的重要部件主旋翼夹座在数控铣床上加工为例,这样即有利于提高加工效率也利于保证加工精度。针对主旋翼零件在实际生产过程中,就曾遇到在零件装夹过程中出现问题,对此问题进行改良,从而设计了一套夹具,用此夹具装夹工件进行加工,以有效地减少工件的装夹和定位时间,最终达到提高加工效率和加工精度,在对工件批量生产较大时价值更加明显。 相似文献
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Changqing Liu Yingguang Li Jiaqi Hua Nanhong Lu Wenping Mou 《The International Journal of Advanced Manufacturing Technology》2018,97(1-4):229-241
Cutting tool state recognition plays an important role in ensuring the quality and efficiency of NC machining of complex structural parts, and it is quite especial and challengeable for complex structural parts with single-piece or small-batch production. In order to address this issue, this paper presents a real-time recognition approach of cutting tool state based on machining features. The sensitive parameters of monitored cutting force signals for different machining features are automatically extracted, and are associated with machining features in real time. A K-Means clustering algorithm is used to automatically classify the cutting tool states based on machining features, where the sensitive parameters of the monitoring signals together with the geometric and process information of machining features are used to construct the input vector of the K-Means clustering model. The experiment results show that the accuracy of the approach is above 95% and the approach can solve the real-time recognition of cutting tool states for complex structural parts with single-piece and small-batch production. 相似文献
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密接式车钩前端车钩体为典型复杂零件,研究其数控加工工艺,进一步明确编制加工工艺流程、设计合适的加工中心夹具、正确选择数控刀具和设定最佳切削工艺参数是保证钩体加工质量、提高生产效率的重要途径。 相似文献
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During the machining process, cutting forces cause deformation of thin-walled parts and cutting tools because of their low rigidity. Such deformation can lead to undercut and may result in defective parts. Since there are various unexpected factors that affect cutting forces during the machining process, the error compensation of cutting force induced deformation is deemed to be a very difficult issue. In order to address this challenge, this article proposes a novel real time deformation error compensation method based on dynamic features. A dynamic feature model is established for the evaluation of feature rigidity as well as the association between geometric information and real time cutting force information. Then the deformations are calculated based on the dynamic feature model. Eventually, the machining error compensation for elastic deformation is realized based on Function Blocks. A thin-walled feature is used as an example to validate the proposed approach. Machining experiment results show that the errors of calculated deformation with the monitored deformation is less than 10%, and the thickness errors were between ?0.05 mm and +0.06 mm, which can well satisfy the accuracy requirement of structural parts by NC (Numerical Control) machining. 相似文献
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复杂箱体类零件数控加工工艺研究 总被引:2,自引:0,他引:2
以汽车空调压缩机缸体为典型复杂箱体类零件实例,研究其数控加工工艺,进一步明确编制合理的加工工艺流程、选择合适的定位装夹方案、有效利用各种数控设备和加工刀具、设定最佳切削用量是保证复杂箱体类零件加工质量、提高生产效率的重要途径。 相似文献