影响主轴箱精度的主要因素

主轴箱是钻镗类组合机床的重要部分,它装配后精度的好坏,直接影响到组合机床的精度。 目前用于钻、扩、铰加工的多轴主轴箱较多,这类主轴箱在加工中,刀具有钻模板导向套引导,工件有专用夹具定位,孔的位置精度要求不高。因此,钻、扩、铰类主轴箱的精度与一般通用万能机床的主轴箱相比是最低的,结构也简单。     

长连接板双面钻孔夹具设计

分析了加长连接板的特点、加工工艺、如何提高加工效率并保证加工精度,重点介绍了双面钻孔夹具的设计过程,夹具的结构用角钢做钻模板本体,使用弓形卡做夹紧支撑,最后介绍了该夹具的使用过程。     

一种带弹性套的新型模架结构

介绍了一种带弹性套的导柱导套新型模架结构,相对传统模架,新型模架通过配钻提高模板孔孔距加工尺寸精度,通过弹性套径向变形降低对模板孔径向尺寸加工精度的要求,解决模板孔与导柱、导套过渡配合装配存在的问题,新型模架可以在一些场合替代传统模架。     

关于等距度与同轴度两种检测方法的再商榷

本文论述了钻镗组合机床精度标准中关于主轴回转轴线和夹具导向孔(或样件孔)轴线相对位置精度的检验方法问题,主张将同轴度检验方法纳入标准,摈弃等距度检验方法。     

关于组合机床多轴箱主轴回转轴线与夹具导向孔轴线相对位置精度检验方法的探讨

本文论述了钻镗类组合机床精度标准中关于主轴回转轴线与夹具导向孔轴线相对位置精度的检验方法问题,对采用等距度检验方法和重合度检验方法作了分析对比,结论是:按等距度来评价主轴回转轴线与导向孔相对位置精度欠佳;但按重合度的数据来评价却是较优的。因此,作为行业控制产品质量的标准,这两种检验方法并存是不适宜的。     

自动送料夹具

在我厂设计制造的一台从三面钻削“东方红—28”型拖拉机离合器压爪支座孔的简易组合机床上,采用了一种自动送料夹具(见图)。这种夹具利用通电松开的气动楔式夹紧机构,并把料道中的一个输送工位作为加工工位。结构简单、紧凑。 工件的定位位置在X方向由导向柱9限定,在Y方向由钻模板12限定,在Z方向用V型夹紧块限定。     

环行自动线、多轴钻主轴箱及回转工作台式组合机床的保护装置

该装置用于在钻模板同主轴箱脱开之前防止回转工作台转位。 要在多轴头中定期地更换刀具,或者在工作台(上面装着夹有工件的夹具)的转位过程中用一个已调整好的多轴头替换另一个多轴头,就要相应地定期使钻模板与多轴头间的刚性     

加工阀盖孔用钻镗两用夹具

生产中等批量阀盖孔时,传统方法是采用钻、镗两套夹具进行加工,增加了设计量,并且工件重新装夹有重复定位误差。针对这一问题,设计一套夹具就能完成以上两种夹具的工作,并采用UGNX70进行钻镗两用夹具的模拟装配。结果表明:该夹具既可以在钻床上使用,又可以在镗床上使用,只需更换钻套或镗套,工件无需重新装夹,降低了夹具设计成本,保证了工件的加工精度,提高了劳动生产率。     

轴套径向孔钻床夹具设计

介绍一种加工轴套径向孔的钻床夹具的工作原理与实施方式,并对钻模进行了可行性分析。调换件的合理应用,避免了夹具的重复设计。该钻模具有结构简单、制造工艺性好、调整方便、生产效率高和实用性强等特点。     

机床夹具精度的分析

提出了夹具精度的判别原则；分析了车、铣、钻三种常用夹具的对刀或导向误差、安装误差的组成和计算方法；并通过实例加以说明。     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.     

Quantitative Analysis of the Crystallographic Orientation Relationship Between the Martensite and Austenite in Quenching–Partitioning–Tempering Steels

The orientation relationships(ORs)between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this work.The ORs in the studied steels are identified by selected-area electron diffraction(SAED)as either K–S or N–W ORs.Meanwhile,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto.The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions.However,the simulated results coincide well with experimental pole figures in the high-index directions{123}_(bcc).A modified method with simplicity based on Miyamoto’s work was proposed.The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel.     

The Mirror with Patterns of Auspicious Animals and Grapes——Exquisite cast mirror and the technology of surface tin-enrichment by rubbing-in and infiltration of tin-rich powder

<正>Bronze mirrors were used by the Chinese people before the introduction of the glass mirror.Only after it was replaced by the glass mirror did the bronze mirror gradually retreat from people's lives.Different styles of bronze mirrors were made in different historical periods,particularly in the Warring States Period,the Han and Tang Dynasties,which were the three peaks of the development of bronze mirror arts in ancient China.The casting techniques were exquisite.The surface of the bronze mirror was smooth and bright enough to reflect one's image,and there were scarcely any casting defects on the mirror surface.On the back of the bronze mirror,there were rich depictions of Arts and Humanities,and the ornamentations were also     

The 9th China International Diecasting Congress & Exhibition

The 9th China International Diecasting Congress ＆ Exhibition was held on July 22-24, 2014 at Shanghai New International Expc Centre. This exhibition was the most successful over the years, with over 6890 visitors and 155 exhibitors, and the exhibition area increased by 30% from 9,500 square meters in 2012 to 12340 square meters. Die casting enterprises from a total of 24 countries and regions, including China mainland, Chinese Taiwan and Hong Kong, South Korea, Japan, Germany, India, Thailand, Malaysia, the United States, Russia, Australia, Iran, Ukraine, Brazil, Colombia, Singapore, Austria, Canada, Croatia, France, Turkey, United Kingdom, Vietnam, attended the congress and exhibition.     

Introduction of the Fluid Control Engineering Institute of Kunming University of Science and Technology

正The Fluid Control Engineering Institute of Kunming University of Science and Technology was set up in 1996.The researches of institute concentrate on electro-hydraulic(pneumatic)servo/proportional control and hydromechatronics.The Institute is committed to research and development of electro-hydraulic control of high-end technical equipment in ferrous metallurgy refining produc-     

RARE METALS Volume Contents

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