共查询到20条相似文献，搜索用时 281 毫秒
1.
梁斯仁 《内蒙古科技与经济》2018,(11)
结合国内外薄壁零件加工变形研究现状,研究薄壁零件加工变形机理,分析了薄壁零件加工变形的影响因素,包括毛坯初始残余应力、切削力、工件装夹以及走刀路径等,对于薄壁零件加工变形预测和控制具有一定的参考意义。 相似文献
2.
3.
《科技通报》2017,(11)
提出一种基于有限元法的薄壁柔性零件的防变形冷加工技术研究方法。该方法先利用层次分析方法对薄壁柔性零件加工变形的影响因素进行提取,得到薄壁柔性零件加工变形影响因素提取属性,通过计算提取属性对目标层的影响程度矢量,得到每个薄壁柔性零件的加工变形影响因素的重要度值,在此基础上采用误差补偿方法计算出薄壁柔性零件的防变形冷加工铣削深度,并结合薄壁柔性零件变形预测模型对薄壁柔性零的切削参数进行优化设计,以最小化所有薄壁柔性零件切削工位的加工误差为目标函数。实验结果表明,所提方法能够有效提高薄壁柔性零件的形位精度,同时对同类的其他薄壁柔性零件的变形控制具有一定的参考价值。 相似文献
4.
5.
薄壁零件在加工过程中最容易出现变形的问题,这也是数控车削加工过程中比较关键的工艺环节。文章首先对于影响薄壁零件加工精度的因素展开分析,接着探究薄壁零件数控车削加工工艺流程,希望可以引导实际的加工工作的顺利开展。其在生产性能不是很好,因为强度低,刚性不高的问题,很容易在加工的时候出现变形,从而影响到零件性能的最大发挥。因此,探讨薄壁零件的数控车削加工工艺,显得尤为必要。 相似文献
6.
8.
薄壁零件因其节约材料、重量轻、结构紧凑等特点已日益广泛地应用在各工业部门。但薄壁零件又因其强度弱、刚性差、易变形,加工中很难保证零件形位精度和加工质量。本人在工作中遇到了一个典型的薄壁零件的批量加工任务。典型的薄壁零件壁厚较薄、结构复杂、有较高的尺寸精度和表面粗糙度要求。如按照常规的加工方案进行加工,不仅成本高、消耗大,而且很难保证精度和生产需要。本文拟通过一些工艺上的优化,解决典型薄壁零件的批量加工。 相似文献
9.
《科学大众》2015,(5)
在现当代社会中,薄壁零件在我国社会经济市场中占据着一个重要地位,究其原因,主要是因为它与其他类型的零件相比,具有低成本、轻质量、高密实度等优点,所以它成为了我国各行各业中迫切需求的一种工业产品。可尽管如此,薄壁零件自身特有的低强度等特点,也使其在实际生产的过程当中,出现了各种各样的变形以及质量等问题。因此,在这种情况下,我们唯有通过对薄壁零件数控车工加工工艺进行不断的分析,并采取可行性较高的措施,对该工艺进行合理的改进并完善,才能够降低其生产中变形及质量等问题出现的概率,进一步提高薄壁零件生产的效率。本文将针对薄壁零件数控加工工艺,对其进行较为深入的剖析。 相似文献
10.
介绍数控铣削薄壁配合类零件加工工艺过程,采用试配法在加工过程中保证零件薄壁尺寸精度与配合精度,防止零件薄壁在配合过程中因挤压薄壁变形而影响尺寸精度。 相似文献
11.
The primary objective for modeling of machining processes is to develop a predictive capability of machining performance in order to facilitate effective planning of machining operations. This capability leads to faster implementation, higher performance, quality at a lower cost. This comes about due to improved selection of machining parameters, optimal fixture design and the avoidance of tool failure. The simulation system presented simultaneously considers the effect of cutter geometry, the cutter's initial position errors, workpiece geometry, machine tool dynamics, and workpiece/fixture system dynamics on the machining process.The integration of all of the above in one model provides an off-line tool to simulate and optimize the machining parameters and the fixture configuration cutting both lead and production time. The modular nature of the simulation system presented allows for the study of many different machining processes. The cutting forces in this system are modeled using a mechanistic approach. NURBS curves and surfaces are utilized for the geometric modeling and simulation of the machining process. While a finite element method is used to model and analyze the workpiece/fixture dynamics. Two case studies are presented to demonstrate the practical application of the presented simulation. The first case presents the optimization of the fixture configuration of a generic automotive component. While the second case presents the results of simulations performed on a novel mill/grind machining process. This process is a combination of face milling and grinding in one operation. Some simulated results are presented along with experimental validation. 相似文献
12.
在机械加工中,由机床、夹具、刀具和工件组成的工艺系统,会有各种各样的误差产生,并影响了工件的加工精度。本文以教学实践经验为基础,简要介绍了机械加工精度的基本知识,进而对影响机械加工精度的因素进行了分析,最后对如何减少各种因素对加工精度的影响提出了相应的对策和建议。 相似文献
13.
锥度弯头模具精度要求高,加工难度大。基于UG软件进行数控加工设计,优化切削参数,选择合理的工件夹具,确定多次装夹的定位基准,优化了加工工艺。有效地提高了加工质量,提高加工的效率,为锥度弯头模具的精确加工提供了先进的加工方法,可供生产加工人员参考借鉴。 相似文献
14.
简要介绍了附加桥壳加工夹具的设计,并利用CATIA三维建模软件进行模拟与仿真操作,使工件在夹具上一次装夹,便完成桥壳所有尺寸的加工。 相似文献
15.
数控机床加工工件时,刀具直接担负着对工件的切削加工,刀具的合理选择和切削用量的合理选择是数控加工工艺中的重要内容,它不仅影响数控机床的加工效率,而且直接影响工件的加工质量。 相似文献
16.
Edwards TL Harper JC Polsky R Lopez DM Wheeler DR Allen AC Brozik SM 《Biomicrofluidics》2011,5(4):44115-4411514
Herein is described the fabrication and use of a plastic multilayer 3-channel microfluidic fixture. Multilayer devices were produced by laser machining of plastic polymethylmethacrylate and polyethyleneterapthalate laminates by ablation. The fixture consisted of an array of nine individually addressable gold or gold/ITO working electrodes, and a resistive platinum heating element. Laser machining of both the fluidic pathways in the plastic laminates, and the stencil masks used for thermal evaporation to form electrode regions on the plastic laminates, enabled rapid and inexpensive implementation of design changes. Electrochemiluminescence reactions in the fixture were achieved and monitored through ITO electrodes. Electroaddressable aryl diazonium chemistry was employed to selectively pattern gold electrodes for electrochemical multianalyte DNA detection from double stranded DNA (dsDNA) samples. Electrochemical detection of dsDNA was achieved by melting of dsDNA molecules in solution with the integrated heater, allowing detection of DNA sequences specific to breast and colorectal cancers with a non-specific binding control. Following detection, the array surface could be renewed via high temperature (95 °C) stripping using the integrated heating element. This versatile and simple method for prototyping devices shows potential for further development of highly integrated, multi-functional bioanalytical devices. 相似文献
17.
《Journal of The Franklin Institute》2018,355(18):9351-9373
This paper deals with an application of the Sliding Mode Control (SMC) in the presence of lumped temperature disturbances in Peltier Cells (PCs). A controller is proposed so that a temperature disturbance reduction is obtained. A constructive Theorem based on a particular sliding mode surface using Lyapunov approach is demonstrated. Specifically, the proven Theorem shows a structural control law which consists of an interacting input law between the two available inputs of current and forced heat convection transfer function (ventilation input). The sliding mode surface is defined in terms of cold and hot state variables, emphasizing a new two sided control approach for PCs. In terms of applications, the localization problems are very important to minimize errors in all cases in which PCs are used. The application approach is targeted on a novel workpiece clamping device, which uses PCs to freeze water on a metallic plate under subzero temperatures. The ice structure is capable of evolving enough bonding strength to clamp workpieces form and force-fitted during machining operations without deforming the piece mechanically. This capability is especially crucial for micro parts as well as for hard to clamp pieces made of brittle or soft materials and irregular shaped complex geometries. The proposed SMC approach shows a robustness against the parametric uncertainties due to the nonlinear model of PCs. Computer simulation results as well as measurements are shown. 相似文献
18.
液压夹具是新型的工业设备。对于传统、专用的液压夹具的设计需要做出一定思考,才能为以后高效能液压夹具的设计更加科学。企业抓住了液压夹具的优缺点辨析,才能向着更加科学、高效的方向前进。 相似文献
19.
韦正 《科技成果管理与研究》2008,(12):78-79,93
文章介绍了公路工程薄壁管桩软基处理的原理与优势,结合施工流程,对管桩施工的质量控制进行了详细阐述认为薄壁管桩在公路工程软基处理中值得推广使用。 相似文献