共查询到20条相似文献,搜索用时 171 毫秒
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周旭光 《组合机床与自动化加工技术》2006,(4):89-90,92
在大批量加工工件时,往往是通过“对刀”来调定刀具的切削位置,对刀块的尺寸是事先要确定的对刀尺寸,文章提出的最优对刀尺寸计算方法,其主要特点是:在确定对刀尺寸公差带分布时,考虑了刀具磨损对工件加工工序尺寸的影响,并且针对所加工的工序尺寸是包容尺寸还是被包容尺寸而采取不同的对刀尺寸公差带分布。这样,就能充分利用刀具的寿命,减少对刀次数,并可使加工出来的一批工件实际尺寸分布中心与所要求的工序尺寸公差带中心相一致. 相似文献
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针对电机转子中套筒、护盖的焊接,设计了激光焊接系统。由于整个工件组合后长度和位置的尺寸存在一定的尺寸公差,需设计特殊夹具吸收其公差。激光焊接夹具包括随行夹具、顶升组件、上止档组件及转盘夹具,将工件置于随行夹具内,顶升旋转组件将工件顶入上止挡组件,以转子的上端面作为定位基准面,实现对工件的精确定位焊接。 相似文献
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张树声 《金刚石与磨料磨具工程》1986,(2)
砂轮作为一种精密加工工具能够用来磨出公差为0.00005英寸(0.00127毫米)的零件。这样的精度取决于金刚石修整质量和砂轮适应性。因为砂轮是由其应用需要而产生的,砂轮工作而必须周期性地重新修锐和重新整形,以保持尺寸公差和锋锐切削作用。适当的修锐和整形,使砂轮保持精确的工作表面,能保证加工的工件精度在尺寸公差之内。 相似文献
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陈亭希 《组合机床与自动化加工技术》2007,(6):91-93
在机械加工中,使用统计公差组织生产,可以降低工艺成本,提高配合质量,避免极限尺寸的孔与极限尺寸的轴相互装配,从而获得最佳的技术经济效果,因此在生产中保证统计公差的要求是十分重要的。统计公差的要求可以通过工艺系统的调整来实现,文章试图通过试切一组工件的方法来调整工艺系统,并通过改变工艺系统精度和试切的工件数量来改变实际尺寸分布,从而实现统计尺寸的要求。 相似文献
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结合大直径热轧无缝钢管的特点,介绍了Φ820 mm限动芯棒精密轧管生产线的设备组成及新型锥形辊穿孔机和限动芯棒精密轧管机的工艺流程、主要参数和特点,以及轧制产品的几何尺寸精度。检测结果表明:在没有定径轧制的情况下,通过穿孔、限动精轧或穿孔、二次穿孔、限动精轧的荒管外径尺寸精度超出成品管精度(外径公差≤±0.5%D)要求;而轧后荒管的壁厚尺寸精度在成品管精度(壁厚公差±5%S~±8%S)要求的范围之内。 相似文献
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某后桥壳侧杆支架工件图如图1所示.材料为Q235A.厚度为3mm,该工件的特点是尺寸精度要求较高,由于要与其他零件进行焊接。因此,配合精度要求高.故外形尺寸公差要求在0.20mm公差范围内.改进前采用的是落料、冲孔分开进行.由于工艺基准不统一.造成质量不能保证,成本过高。 相似文献
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我车间技改组在设计电磁阀阀芯加工流水线的第二台设备-YZ007车外圆专机时,考虑采用外圆液压自动检查装置,以实现工件的自动检测。工件磨削前的尺寸为φ14_(0.25)~(0.35),公差带仅为0.1毫米。经使用,测量精度达到0.02~0.03毫米。工件直径大于φ14~(0.35)毫米时发出电气讯号,小于φ14~(0.35)毫米时不发讯号,满足了设计使用要求。我们在设计这台机床时,考虑用最简单的程序动作完成加工任务。刀架没有径向自动进退刀机构,而是采用零件取走后刀架作纵向快退原位的办法实现退刀,在加工过程中,工件外圆不 相似文献
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山东钢铁股份有限公司莱芜分公司特钢事业部采用废钢+铁水(70%~80%)-100 t UHP EAF-双工位120 t LF-VD-连铸-轧制的工艺开发了API5L BNS石油管用圆管坯,介绍了其冶炼、连铸、轧制的工艺控制关键点,批量生产的130、150、180、220 mm等规格圆钢的化学成分、气体含量、夹杂物级别、晶粒度、表面质量和高倍金相组织等均满足协议要求。 相似文献
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通过对加热过程的数值计算,计算理论加热时间、空气消耗系数、产物体积等参数,为加热炉的设计提供依据。利用加热过程的能量函数,采用可容差变分法对火曲工件出炉温度,加热过程中的表面温度、中心温度进行数值模拟,从而寻求最优化温升过程,以减少能量消耗,提高加热炉效率并为火曲工艺的自动化提供支持。 相似文献
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This paper presents the development of an on-fine system for the evaluation of workpiece size and geometrical tolerances in bar turning. The measurement is performed using three ultrasonic non-contact proximity sensors which operate in a wet cutting environment. Data conditioning of radius measurements based on spectral analysis and error separation methods are used in order to eliminate errors due to spindle runout and workpiece axis translation. Analytical formulation of cylindricity tolerance is presented. Non-linear numerical optimization techniques are used to fit the data. Two different fitting functions are compared: the least squares and the minimax fit. The sufficiency of the sampled data set is investigated. The determination of cylindricity tolerance of the workpiece from given experimental data is presented and recommendations are given. 相似文献
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The size of machines for the manufacture of micro-components commonly stands in gross disproportion to the component size. The achievable accuracy is limited by inaccuracies of mechanical positioning elements and external disturbances. Micro-machining of metals can be realised in manifold ways by laser processes. In this paper, a compact module for laser chemical processing using continuous wave laser radiation is presented. For the laser-induced chemical machining the material removal is a result of thermochemical reactions between an etchant and the surface of a metallic workpiece at low laser power densities. Laser-induced chemical machining results in improved surface quality of the machined workpiece and it also avoids stress and strain of the material. Through the use of a micro-mirror array (DMD) for flexible beam shaping a 2-dimensional machining of the workpiece is possible. The laser chemical machining method now allow for the first time to connect the DMD technology with laser-based micro-machining for compaction of the machining module. 相似文献
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A review of the mechanics of metal spinning 总被引:2,自引:0,他引:2
This review presents a thorough survey of academic work on the analysis and application of the mechanics of spinning. It surveys most literature published in English and the most important publications in German and Japanese languages. The review aims to provide insight into the mechanics of the process and act as a guide for researchers working on both metal spinning and other modern flexible forming processes.The review of existing work has revealed several gaps in current knowledge of spinning mechanics: the evolution of the stress state and the strain history of the workpiece in both conventional and shear spinning is not well understood, mainly due to the very long solution times that would occur in modelling the process throughout its duration with a sufficiently fine mesh to capture detailed behaviour through the workpiece thickness; the evolution of microstructure, residual stress and hence springback, has not been examined—either numerically or by experiment; the failure mechanisms of spinning – fracture and wrinkling – are only partially understood, through analogy with other processes, and as yet models of the process have not made use of contemporary damage mechanics; the design of toolpaths required to make particular parts without failure remains an art, and cannot currently be performed automatically with confidence. Studies on novel process configurations in spinning have shown that great potential for innovation in spinning exists. The process has the potential to be more flexible, to produce a wider range of shapes, and to form more challenging materials. 相似文献