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正1.精加工方法大卧车是指C650以上的设备,在加工孔径Ф350mm、深500mm以上、表面粗糙度值达Ra=1.6μm的大孔时,其加工手段大致为:(1)精车在车床上用精车刀加工,一般表面粗糙度值达Ra=3.2μm。(2)滚压在车床上用滚压器加工,一般表面粗糙度值达Ra=0.8μm,但对工件材料有针对性要求;工件材料的硬度及材质会影响表面质量,应用范围相对狭窄。 相似文献
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有色金属轴套孔滚压加工 总被引:1,自引:0,他引:1
有色金属轴套内孔通常是在金刚镗床上进行终加工 .由于有色金属表面的光整加工不能采用磨削加工 ,而切削加工所能达到的表面粗糙度值一般不会小于Ra0 .8μm,故对有色金属轴套内孔表面进行光整加工时 ,对机床和刀具的要求很高 ,而切削用量、进给量都很小 ,加工效率低 .有色金属的硬度不高 ,塑性好 ,采用滚压加工可减小工件表面的粗糙度值 ,强化工件的表面 ,而对设备的要求不高 ,这是有色金属的表面光整加工的一种很好的选择 .由于轴套结构的特殊性 ,薄壁短套一般是将其安装在轴承座内或其它结构件内后进行终加工 .加工时对轴套内孔的尺寸精… 相似文献
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孙怀三 《机械工人(冷加工)》2008,(9):43-44
复合锪钻如图1所示。它是一刀多刃加工内孔的刀具。近年来多见于航空、航天和机械工业。复合锪钻是高效率刀具之一。它可以在钻床、卧式车床和自动组合机床上,加工钢、铸铁、有色金属及其合金。它可以加工φ5-φ50mmH8级精度的孔。表面粗糙度值Ra=1.6μm,相对部位的同轴度可达0.01~0.02mm。复合锪钻可作精加工刀具,也可作复合铰刀铰孔前的半精加工刀具。 相似文献
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由于近年来柴油机生产厂对其提供配套的曲轴产品质量要求不断提高,特别是曲轴产品图样要求的油道孔,内孔加工后的表面粗糙度值为Ra=3.2μm,位置度公差为φ0.6mm,直线度公差为0.2mm。这些技术要求对于深孔加工的钻曲轴油道孔工序来说还是比较困难的。为此我公司近几年逐渐将用普通高速钢钻头钻削加工曲轴油道孔,改进为用枪钻来钻削加工曲轴油道孔。 相似文献
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<正>在铸造铝硅合金(ZL101)上加工直径11+00.035mm、深 143mm的通孔,硬度 HB50~80,孔表面粗糙度值Ra1.6μm,孔中心线直线度0.02mm。 相似文献
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吴怀红 《机械工人(冷加工)》1989,(10)
按照部颁标准,钻套的内孔表面粗糙度为Ra0.8。而对于M8、M10螺纹底孔的钻套,由于内径小,只有φ6.7mm或φ8.5mm,铰孔困难,而且一般刀具制造工厂都不生产此尺寸的铰刀。为此,我们通过工艺试验,改制麻花钻,用反拉法解决了钻套内孔表面粗糙度的问题。现以孔径φ8.5mm的钻套为例,先冲成φ8.2mm的孔,即留0.30mm的反拉法加工余量,然后用改制的麻花钻加工(改制麻花钻主要尺寸如图所示)。其装夹方法是把改制的麻花钻柄部穿过钻套,用标准三爪钻夹头夹紧。加工时,注意进给量不能太大,否则因拉削 相似文献
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王猛 《机械工人(冷加工)》2010,(19):38-40
喷吸钻(又称双管钻)是一种加工效率较高,加工质量好的新型内排屑深孔钻。适用于加工孔深与孔径比不超过100,直径为20mm以上的孔。用喷吸钻加工出的深孔,精度可达IT10-IT17,加工表面粗糙度值Ra=0.8—3.2μm,孔的直线度为0.1mm/1000mm。 相似文献
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为了提高和改善微沟槽表面质量,设计了高速微铣削实验,研究了微沟槽底面表面粗糙度和侧壁残留毛刺的变化规律。从理论角度引入了已加工表面的形成机理,建立了微观表面粗糙度理论模型,提出了刀具跳动对侧壁形貌变化影响的规律。利用三轴联动精密微细铣削机床加工微细直沟槽,并选取主轴转速、轴向切深、进给速度、刀具跳动量和材料组织结构为研究因素。采用多因素正交实验和极差分析法,对表面粗糙度值进行数值分析。铝合金,钢和钛合金三类微沟槽底面对应的最佳表面粗糙度值变化范围分别为1.073~1.481 μm,0.485~0.883 μm,0.235~0.267 μm;无刀具跳动钛合金微沟槽壁毛刺的最大高度为7.637 μm,而当刀具存在0.3 μm的径向综合跳动量时对应的微槽壁毛刺的最大高度为21.79 μm。铣削参数对表面粗糙度值的影响按从大到小依次为进给速度、主轴转速、轴向切深,且随着进给速度和轴向切深的增大,表面粗糙度值增大;随着主轴转速的增大,表面粗糙度值先减小后增大;在相同加工条件下,若微圆弧刀刃无磨损,微刀具的跳动量对微直沟槽侧壁表面质量有较大影响。同时,不同金属材料特性也是影响微沟槽表面质量的潜在因素。 相似文献
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麻花钻是实现孔加工的重要工具,然而切削刃口的快速磨损是制约钻孔质量和钻头寿命的重要因素。基于产品抽样钻孔试验与正交试验,本文对高速钢麻花钻的磨损、破损等失效形式进行了综合分析,探讨了以钻孔直径为评价指标时的孔加工数量与孔径的关系,并对麻花钻磨损的关键影响因素进行了正交试验研究。结果表明,麻花钻磨损与破损形式主要有主切削刃前刀面与后刀面磨损、横刃磨损、刃带磨损、外圆转角磨损、崩刃等;切削速度对麻花钻磨损影响最大、进给量次之、孔深影响最小;此外,随着加工孔数量的增加,孔径呈减小趋势。 相似文献
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Fengbiao Wang Yongqing Wang 《The International Journal of Advanced Manufacturing Technology》2018,99(9-12):2271-2281
This paper presents the first comprehensive investigation that aluminum honeycomb has inevitable machining defect in milling process, such as deformation, burr, and collapse. Ice fixation method was used to clamp workpieces, and inner-injection liquid nitrogen was employed for a series of cryogenic milling machining. In the machining process, the main machining parameters including in honeycomb orientation, milling width, cutting depth, cutting speed, and feed were executed experimental research. Meanwhile, the machining parameter optimization, range, and significant analysis were adopted to analyze the influence of machining parameters on the machining surface quality, as well as the optimal parameter combination and milling machining surface quality were predicted and verified. The results show that the ice fixation aluminum honeycomb method with cryogenic milling is much advanced than that of conventional ones, and many machining defects are effectively restrained. At the same time, the influence of machining parameters on machining qualities in descending order is cutting depth, cutting speed, honeycomb orientation, feed, and milling width. The minimum roughness value (Ra?=?0.356 μm) of the predicted machining surface is similar to the actual machining result (Ra?=?0.362 μm). It verifies the feasibility of the optimization method. Furthermore, it is proved that the ice fixation + liquid nitrogen cooling method has a positive effect on the high milling quality and implement efficiency for aluminum honeycomb and other difficult-to-machine materials. 相似文献
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Masato Okada Naoki Asakawa Eisuke Sentoku Rachid M’Saoubi Takashi Ueda 《The International Journal of Advanced Manufacturing Technology》2014,72(1-4):475-485
In this study, the cutting performance of an indexable insert drill with an asymmetric geometry for cutting difficult-to-cut materials was investigated. A solid twist drill with a symmetric geometry was used to compare the cutting characteristics. The cutting characteristics were evaluated using the thrust force, inner-surface roughness of the drilled hole, wear behavior, and tool temperature. Workpieces made of stainless steel, titanium alloy, and nickel-based alloy were selected as difficult-to-cut materials, and carbon steel was also selected. The tool temperature was higher in the order of carbon steel, stainless steel, titanium alloy, and nickel-based alloy for every drill under minimum quantity lubrication cutting. The influence of the workpiece material on the thrust force was different from that of the tool temperature for the indexable insert drill, whereas that of the solid twist drill was similar to the tool temperature tendency. When cutting the titanium alloy and nickel-based alloy, the tool temperature and thrust force of the indexable insert drill were lower than those of the solid-type twist drill. The inner-surface roughness of a hole drilled with the indexable insert drill had almost the same quality as that of a hole drilled with the solid-type twist drill when cutting the difficult-to-cut materials. The wear behavior of the indexable insert drill was remarkably different from that of the solid-type twist drill, and the flaking of the coating and the abrasion wear at the rake face were notable in the indexable insert drill. 相似文献
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介绍了枪钻的结构特点以及加工时数控机床所需具备的硬件要求,通过对不同材料或直径枪钻切削参数的合理选择及计算,能有效地解决在数控机床上完成深孔加工时的排屑、冷却和钻孔轴线歪斜等问题。 相似文献