共查询到20条相似文献,搜索用时 91 毫秒
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硬质合金丝锥由于其比高速钢丝锥高得多的耐磨性而得到越来越广泛的应用,大量用于铸铁、铝合金、硬青铜、耐热合金、淬火钢及硬塑料、玻璃钢等零件上螺纹孔的加工。由于其丝锥刃部是硬度很高的硬质合金材料,加工此类丝锥时难度较大,用普通高速钢丝锥的工艺方法已无法满足要求,必须采用特殊的加工手段才能完成,因此丝锥制造难度大、成本高。不仅如此, 相似文献
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《机械工人(冷加工)》1977,(6)
我们曾接受一项无磁钢(奥氏体高锰钢)零件的不通孔攻丝任务。这种材料强度较高,韧性很大,在切削过程中产生加工硬化,切削性能很差,用普通标谁丝锥攻不到几扣就折断了。我们在分析了普通丝锥难于加工硬、粘材料的原因后,大胆革新,利用废麻花钻头改制了一种新型攻丝工具——双螺旋槽丝 相似文献
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丝锥是加工各种内螺纹的主要工具,但是一种规格的丝锥只能加工一种规格的螺孔,因此丝锥的品种规格很多,为了加工大规格的螺孔,丝锥的尺寸就相当大,价格昂贵.同时由于受到形状及结构的限制,有时加工出来的螺纹表面质量不好,刀具的寿命也比较短,随着具有螺旋线插补功能的数控机床的应用,开发了应用一种规格的螺纹铣刀加工螺距相同多种直径规格内螺纹的新工艺,德国EMUGE、日本YAMAWA、OSG等公司开发了多种规格的螺纹铣刀,铣刀的结构有整体式和装夹刀片式两种,材料有高速钢和硬质合金两种,其工作原理完全相同,本文主要介绍整体高速钢螺纹铣刀. 相似文献
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我厂加工的直连杆见图1,其螺孔上有12.2mm的定位孔,其表面粗糙度要求Ra1.6μm。工艺规定先加工定位孔,后攻丝。攻丝时,特制丝锥从连杆分开面开始攻丝,使定位孔表面遭到划伤,达不到工艺要求,影响了产品质量,并且特制丝锥成本高。为此我们设计了加工连杆螺孔定位孔和螺纹的组合机床。1机床的工作原理根据工件的特点,新设计的组合机床在连杆分合面一侧镗孔,在另一侧攻丝,要求镗头轴心线和丝锥轴心线重合。组合机床结构见图2c图2组合机床的主要结构1.镗头2.镗刀杆3.导轨4.底板5.定位挡铁6.丝锥7.双导向座8.攻丝变速箱9.靠模10.床身1… 相似文献
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本文提出的锥管螺纹挤压丝锥,适用于16V240ZJB(C)型柴油机机体联结管Rcl/4锥管螺纹孔的加工。针对锥管螺纹联结性质,设计了两种工艺底孔。实践证明,用锥管螺纹挤压丝锥,采用圆锥底孔,加工柴油机机体联结管Rcl/4锥管螺纹孔,攻丝效率高,工件连接强度高,丝锥寿命长。 相似文献
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我厂加工的直连杆(图1)螺钉孔上有122+0019mm0的定位孔,粗糙度要求Ral6。工艺规定先加工定位孔,后攻丝。攻丝时,特制丝锥从连杆分开面开始攻丝,使连杆螺钉孔的定位孔粗糙度遭到划伤,达不到工艺要求,影响了产品质量,并且特制丝锥成本高。为... 相似文献
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Multidisciplinary design optimization of a milling cutter for high-speed milling of stainless steel 总被引:1,自引:1,他引:0
Guangjun Liu Guangyu Tan Guanghui Li Yiming Kevin Rong 《The International Journal of Advanced Manufacturing Technology》2013,68(9-12):2431-2438
The milling cutter’s fracture strength is more important than its chemical stability and thermal conductivity in high-speed milling. The multidisciplinary design optimization (MDO) method is employed to optimize the fracture-resistant performance of a milling cutter in this work. An experimental study on high-speed milling of the martensitic stainless steel 0Cr13Ni4Mo is conducted. The cutting forces and cutting temperature in the milling process are measured to provide initial data for the structural optimization of the milling cutter. The mathematical models of cutting force and cutting temperature are studied. Considering that the induced stress in the milling cutter is generated by thermomechanical coupling, the thermoelastic–plastic governing equation in the milling process is introduced in this work. The sensitivity of the structural parameters to the maximum equivalent stress of the milling cutter is calculated, and the structural parameters that have the greatest effects on the maximum equivalent stress are determined as design variables for the cutters’ optimization. The MDO procedure for the cutter’s optimization consists of updating of solid model, finite element analysis of thermomechanical coupling, postprocessing, and optimization algorithm. The MDO results show that the optimized milling cutter has a better fracture-resistant performance than the initial one. The maximum deformation, overall equivalent stress, and deformation are decreased. 相似文献
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高强度钢和超高强度钢的切削加工 总被引:1,自引:0,他引:1
阐述了高强度钢和超高强度钢的切削加工特点,同时阐述了高强度钢和超高强度钢铰削、钻削、铣削加工时刀具材料、刀具几何参数及切削用量的合理选择。 相似文献
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不锈钢具有韧性大、热强度高、导热系数低、加工硬化严重等特性,机械加工困难。为了提高不锈钢切削性能,选择的刀具材料一般为硬质合金和高速钢材料两种,对于形状复杂的刀具,主要采用高速钢材料。刀具几何角度的选择包括前角、后角、主偏角、刃倾角的选择,以车刀为例,分别进行了介绍。另外,合理选择了切削用量和切削液。通过对加工过程中各项参数的优化,可有效提高切削不锈钢零件的加工效率和产品质量。 相似文献
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C.K. Toh 《The International Journal of Advanced Manufacturing Technology》2006,27(5-6):473-480
The use of high-speed milling (HSM) for the production of moulds and dies is becoming more widespread. Critical aspects of
the technology include cutting tools, machinability data, cutter path generation and technology. Much published information
exists on cutting tools and related data (cutting speeds, feed rates, depths of cut, etc.). However, relatively little information
has been published on the evaluation of cutter paths for this application. Most of the research focuses on cutter path generation
with the main aim on reducing production time. Work concerning cutter path evaluation and optimisation on tool wear, tool
life and relevant workpiece machinability characteristics are scant. This paper investigates and evaluates the different cutter
path orientations when high-speed finish milling inclined hardened steel, at a workpiece inclination angle of 75°. The results
demonstrate that employing a vertical downward orientation achieved the longest life. However, in terms of workpiece surface
roughness, vertical upward orientation is generally preferred. 相似文献
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