MOTION ANALYSIS AND DESIGN OF ACCUMULATOR FOR HYDRAULIC ROCK DRILL

ＭＯＴＩＯＮＡＮＡＬＹＳＩＳＡＮＤＤＥＳＩＧＮＯＦＡＣＣＵＭＵＬＡＴＯＲＦＯＲＨＹＤＲＡＵＬＩＣＲＯＣＫＤＲＩＬＬＬｉｕＳｈｉｘｕｎ（ＣｏｌｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌａｎｄＥｌｅｃｔｒｉｃａｌＥｎｇｉｎｅｅｒｉｎｇ，ＣｅｎｔｒａｌＳｏｕｔｈＵｎ...     

ANALYSES OF ENERGY LOSSES AND ACCUMULATOR AND PARAMETERS DESIGN METHOD OF HYDRAULIC IMPACTOR MECHANISM

ＡＮＡＬＹＳＥＳＯＦＥＮＥＲＧＹＬＯＳＳＥＳＡＮＤＡＣＣＵＭＵＬＡＴＯＲＡＮＤＰＡＲＡＭＥＴＥＲＳＤＥＳＩＧＮＭＥＴＨＯＤＯＦＨＹＤＲＡＵＬＩＣＩＭＰＡＣＴＯＲＭＥＣＨＡＮＩＳＭ￥Ｈｅ，Ｑｉｎｇｈｕａ（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｃｈａｎｉｃａｌＥｎ...     

ANALYSIS OF HYDRAULIC POWER SOURCES DISPOSITION AND ENERGY CONSUMPTION FOR HYDRAULIC DRILL RIG

ＡＮＡＬＹＳＩＳＯＦＨＹＤＲＡＵＬＩＣＰＯＷＥＲＳＯＵＲＣＥＳＤＩＳＰＯＳＩＴＩＯＮＡＮＤＥＮＥＲＧＹＣＯＮＳＵＭＰＴＩＯＮＦＯＲＨＹＤＲＡＵＬＩＣＤＲＩＬＬＲＩＧ￥Ｈｅ，Ｑｉｎｇｈｕａ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｃｈｉｎｅＥｎｇｉｎｅｅｒｉｎｇ，...     

CALCULATION OF THE α CORRECTION FACTORS FOR ELECTRON MICROPROBE ANALYSIS OF OXIDES AND ITS APPLICABILITY

本文用FORTRAN语言编写的电子计算机程序计算了14种氧化物在加速电压为20KV,出射角为18°实验条件下的α因子表.并通过对若干二元系统和氧化物为端元元素系统的计算,指出了C/K—C的关系不是直线.讨论了在使用Albee等人按照线性关系计算出的α因子进行氧化物定量修正时,所引进的误差以及使用这些α因子应该注意的问题。     

THEORETICAL CALCULATION OF SPECIFIC INTERFACIALENERGY OF SEMICOHERENT INTERFACE BETWEEN MICROALLOY CARBONITRIDES AND AUSTENITE

According to the misfitting dislocation theory,a method of theoretical calculation was devel-oped for the specific energy of the semicoherent interface between microalloy carbonitridesand austenite matrix.The calculating formulae were derived and the results were satisfactorilyapplied on the research works.     

BEHAVIOUR AND MECHANISM OF STRESS CORROSION CRACKING FOR Al-Li-Cu-Mg ALLOY

Studies were made of the influence of aging conditions and applied potentials on thestress corrosion carcking(SCC)susceptibility for an Al-Li-Cu-Mg alloy by slow strainrate technique.The relationship between the relative hydrogen content on specimensurface,the applied potentials and elapsed time has also been examined.The SCCsusceptibility was found to be dependent on aging conditions in which the peak agedcondition gave the worst SCC resistance and the natural aged condition had the best one.The SCC susceptibility and surface hydrogen content relates to the applied potentials.The anodic potentials increase SCC susceptibility,while the cathodic ones below thecritical potential accelerate SCC.It is considered that both the anodic dissolution and     

THEORETICAL DERIVATION OF CRITERION G／FOR PREDICTION OF SHRINKAGF CAVITIES AND POROSITIES IN CASTINGS

ＴＨＥＯＲＥＴＩＣＡＬＤＥＲＩＶＡＴＩＯＮＯＦＣＲＩＴＥＲＩＯＮＧ／ＦＯＲＰＲＥＤＩＣＴＩＯＮＯＦＳＨＲＩＮＫＡＧＦＣＡＶＩＴＩＥＳＡＮＤＰＯＲＯＳＩＴＩＥＳＩＮＣＡＳＴＩＮＧＳ￥Ｂ．Ｑ．ＪｉｏａｎｄＢ．Ｃ．Ｌｉｕ（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｃｈ...     

A NEW HEAT-TREATMENT PROCESS FOR 2014 ALUMINUM ALLOY AND ITS MECHANISM

The plan of heat-treatment process for 2014Al alloy is designed using orthogonal method, the heat-treatment experiments are made and the mechanical properties are tested according to the designed plan. The effect of solid solution temperature, ageing temperature, ageing time on microscopic mechanism of the mechanical properties of the 2014Al alloy is studied using microscope, transmission electron microscope. The best heat treatment process of the 2014Al alloy is developed. The experimental results indicate that the strength σ_b, yield stress σ_(0.2), percentage elongation δ of the alloy reach separately 490～500 MPa, 450～490 MPa, 10～12％ adopting the new heat treatment process. Compared with GB, the strength increases 20～30％, the percentage elongation increases 30～40％. The mechanism of the new heat-treatment process is also discussed.     

GEOMETRIC MODEL AND APPLIED METHOD FOR THE CALCULATION OF GRAIN SIZE DISTRIBUTIONS

Most of the available methods for the calculation of the three dimensional(3D)grain size dis-tribution functions(SDF)are based on the S model and lead a grave systematical error.Theorigin is the basic supposition of spherical grains in the S model,which does not correspondwith the feature of real grains.A new model called A model is developed based on the hypothe-sis of polvhedral grains.The probability functions of the A model and the method to calculatethe 3D SDFs using the A model are given in the present paper.The theoretical analyses andexperimental tests have demonstrated that the A model reduces the systematical error radical-ly.It is nearly as simple as the so far used S model,but gives much better results in repro-ducing of 3D SDFs from the measured ID or 2D SDFs.     

FRACTURE MECHANISM AND MICROMECHANICAL ANALYSIS OF POLYSYNTHETICALLY TWINNED CRYSTALS OF γTiAl ALLOYS

１　ＩＮＴＲＯＤＵＣＴＩＯＮＧａｍｍａｔｉｔａｎｉｕｍａｌｕｍｉｎｉｄｅｈａｓｒｅｃｅｉｖｅｄｉｎｃｒｅａｓｉｎｇａｔｔｅｎｔｉｏｎｂｅｃａｕｓｅｏｆｉｔｓｈｉｇｈｓｐｅｃｉｆｉｃｓｔｒｅｎｇｔｈａｎｄｓｔｉｆｆｎｅｓｓａｔｒｏｏｍａｎｄｅｌｅｖａｔｅｄｔｅｍｐｅｒａｔｕｒｅ,ｃｏｍｂｉｎｅｄｗｉｔｈｓａｔｉｓｆａｃｔｏｒｙｃｒｅｅｐｂｅｈａｖｉｏｒａｎｄａｄｅｑｕａｔｅｏｘｉｄａｔｉｏｎｒｅｓｉｓｔａｎｃｅ［１］．ＴｉｒｉｃｈγＴｉＡｌｂａｓｅｄａｌｌｏｙｓｈａｖｅｇｏｏｄｐｒｏｓｐ…     

送丝随动机构的设计及应用效果

介绍了设计并研制的送丝随动机构以及对其所进行的应用效果试验,试验结果表明,该随动机构的应用可减小因送丝软管的空间多弯状态所导致送丝波动现象,并具有先进性和适用性,是提高弧焊机器人送丝系统稳定性的有效措施之一。     

中小型锻造液压机的辅助设备

本文介绍由西安重型机械研究所最新设计的、用于中小型锻造液压机上的辅助设备,包括送料小车、移动式砧台和砧库,上砧快速更换和旋转装置等。     

轧制乳化油的制备及各组分的作用机理

轧制乳化油是机械加工中广泛使用的一类加工液，本文论述了轧制乳化油的各组分性能、选用和其作用机理。提出了轧制乳化油的制备过程中的注意事项。轧制乳化油的研究和改性有着广泛的发展空间，国内在机加工液方面应尽快制定统一规范和标准。     

超硬磨料冲击韧性测试技术及应用

本文主要讨论了冲击韧性的测试原理，测试方法和测试仪器，并分析其优缺点。最后，作者提出了采用设备仪器和测试方法意见和建议。     

圆筒混合机传动功率的分析计算

本文经过一系列地分析推导,归纳出圆筒混合机传动功率在设计中的计算方法,并通过实例计算进一步阐明了上述计算公式的应用方法。     

多通管挤压胀形过程的分析与计算

挤压力、胀形力和平衡力三者之间的最佳匹配关系是多通管超高压挤压胀形工艺中的关键问题 ,提出并采用“应变样条”法建立了这 3个成形力间的数学表达式。同时 ,根据多通管挤压胀形双重非线性的变形特点 ,建立了动力分析有限元模型 ,采用自行开发的程序软件 (SMFT) ,模拟分析和计算了这 3个力的大小及相互匹配关系对挤压胀形的影响     

圆盘造球机调角装置的设计计算

本文介绍了圆盘造球机的一种新型调角装置,即为具有角度指示器的手动蜗轮蜗杆装置。文中还给出了该装置的结构和有关计算。该装置操作方便并能自锁。