Improvement in Machining Performances of SiC Workpiece Using TW-Electro Chemical Spark Machining

Silicon - Electrochemical Spark Machining (ECSM) is applicable to machine the materials which are non-conducting. The present research work extended the application area of ECSM process from...     

螺旋折流板的加工方法

螺旋折流板换热器已成为目前换热器研究领域的热点，螺旋折流板的加工制造更是其中的主要工作。分析了螺旋折流板换热器的结构，介绍了螺旋折流板的加工方法，设计了螺旋折流板加工所用的三种工装，即平台划线工装、钻孔工装和立车工装。     

机械加工废冷却液处理工程

采用化学药剂破乳—Fenton氧化—SBR—活性炭吸附工艺处理某发动机制造厂机械加工废冷却液,在进水CODcr、石油类和SS分别为150000～300000mg/L、1000～2000mg/L、100～200mg/L的情况下,处理后的出水CODcr、石油类和SS分别可达〈120mg/L、〈10mg/L、〈30mg/L,极大降低了废水中的污染物质。     

Machining,Characterization and Optimization: A Novel Approach for Machining Channels on Silicon Wafer Using Tailor-Made Micro Abrasive Jet Machining

Silicon - Literature reveals that machining a silicon wafer is very arduous due to its high brittle nature and low fracture toughness. Researchers have attempted to machine features on a silicon...     

UG软件在数控加工中的应用

利用3D-MAX提供人像曲面模型,在UG软件中进行处理和加工,介绍UG软件强大的数据转换功能,丰富的加工策略和强大的曲面加工能力。     

陶瓷刀具在金属切削加工中的应用特性分析

本重点分析了陶瓷刀具的应用特性．并给出了其在金属加工中的一般特性参数。     

Laser Beam Machining of Porous Woodceramics

Laser beam machining was tested as a practical method for machining porous woodceramics (WCS). A black carbonized layer is generally formed on the processed surface when woody materials are processed with laser beam machining. This problem does not occur on the WCS because they are burned. The processed surface temperature during laser beam machining can be estimated from the relationship between the burning temperature and C and O₂ component concentrations. Burning (scorching) on the processed surface decreases slightly as the feed speed of the workpiece increases. WCS are more easily processed with laser machining after being burned, using pulse oscillation to reduce the thermal influence.     

Machining of plate packs for molds

Refractories and Industrial Ceramics -     

陶瓷后加工技术

陶瓷材料之所以难加工是因为它的高硬度、脆性、低热冲击稳定性等。     

Ductile-Regime Machining of Germanium and Silicon

Precision machining of germanium and silicon was studied using single-point diamond turning. Special attention was directed to the so-called ductile regime wherein optical quality surface finishes can be machined directly on brittle materials. A novel interrupted-cutting test and a new model of the machining process were used to measure a critical-depth parameter experimentally. This parameter governs the transition from plastic flow to fracture along the tool nose. The critical-depth parameter can be used to provide physical insight into the effect of various machining parameters such as tool rake angle or tool clearnace angle. Because of a complex interplay between tool geometry, machining parameters, and material response, a large fraction of material removal occurs by fracture even when ductile-regime conditions are achieved.     

Machining and Characterization of Multidirectional Hybrid Silica Glass Fiber Reinforced Composite Laminates Using Abrasive Jet Machining

Silicon - Machining of multidirectional Hybrid Fiber Reinforced Composite (HFRC) is a challenging task because of defects like matrix cracking, fiber pullouts, delamination, burr formation, and...     

可加工陶瓷材料的机械加工技术

介绍云母玻璃陶瓷、氧化物陶瓷和非氧化物陶瓷3类可加工陶瓷材料的显微结构特性与材料可加工性的关系，层片状结构与弱界面使陶瓷材料具备可加工性。分析了可加工陶瓷材料机械加工过程中的特性；适宜的加工工艺参数、低加工损伤及材料的沿晶界断裂模式。结合金属材料的可加工性研究，讨论了适于陶瓷材料可加工性评价的研究方法。     

人工关节的数控加工研究

陶瓷材料因其硬脆特性,一直是精密加工的难点和研究热点。本文介绍了生物陶瓷人工关节的数控精加工实验,分析了加工特点和影响加工质量的因素,得出了此精密加工方法经济高效的结论。     

Hydrothermal-Reaction-Assisted Laser Machining of Cubic Boron Nitride

Although the high hardness and chemical stability of cubic boron nitride (cBN) complicate its machining, the mass decrease of cBN in a steam environment at high temperature has been reported. In this study, we investigated hydrothermal-reaction-assisted laser drilling of cBN in various environments. A single-crystalline cBN grain, binder-containing sintered cBN, and binderless sintered cBN were irradiated with an Ar ion laser in water and steam, and in gas atmospheres. The cBN reacted with water, and NH₄⁺ or NH₄⁺-N and boric acid were produced. Hydrothermal-reaction-assisted machining was not effective for binder-containing sintered cBN, but was effective for single-crystalline cBN and binderless sintered cBN.     

Electrical Discharge Machining of Tungsten Carbide-Cobalt Composites

Increasing the current, the frequency, or the pulse duration up to certain values increased the speed of cutting and rate of removal. The amount of liquid smearing the cavities prcduced by dislodging the WC grain and microcracks increased with increasing cobalt content and/or WC grain size. Depletion of carbon and formation of W₂C and WC_1−x were detected on the surface. An analysis of debris showed that, in addition to melting the cobalt matrix, metallic vapors are formed and condense to hollow noncrystalline spheres which deformed and condense to hollow noncrystalline spheres which deform and crystallize if crushed.     

双滑履水泥磨筒体加工技术

2002年我厂为北京太行邦正公司制作了两台准4.2m×13m双滑履水泥磨,图纸由天津水泥工业设计院设计。目前在国际上大型磨机多趋向采用滑履支承结构。因为此结构不仅解决了传统的主轴承支承中空轴结构中连接中空轴与筒体的螺栓受剪切力面造成断裂的困扰,而且通过改进支承方式,从结构上更好地满足了水泥工艺的要求。但是,双滑履轴承支承的磨机由于结构复杂给设备的加工造成了困难,尤其是磨机的筒体部分加工困难,所以本文仅就磨机筒体的加工方法进行介绍。准4.2m×13m水泥磨筒体部分为焊接结构,它主要由筒体、进口滑环、出口滑环和出料管四部分…     

电解加工技术研究现状

电解加工是一种以离子形式去除加工件表面材料的方式,使得该技术在微细加工领域具有先天的优势。各种新型电解加工方式的出现,解决了传统电解加工中的不足,在机械、电子、宇航等领域得到广泛应用。     

陶瓷零件的加工方法

工程陶瓷具有极高的硬度、良好的耐磨性和耐腐蚀性以及脆性大等特点，属于难加工材料，特别是加工高精度、形状复杂的构件非常困难。陶瓷材料作为工程材料的大规模推广应用，在很大程度上取决于陶瓷零件加工技术的发展。笔者综述了陶瓷零件的加工方法及最新进展。     

Optimizing Net-Shape Ceramics for Green Machining

Based on previous work, the material properties of zirconium disilicide containing net-shape ceramic compositions are adjusted to minimize the edge flaking that occurs during micromilling of the green bodies. The material compositions (besides ZrSi₂, also containing ZrO₂, Al₂O₃, MgO, SiO₂, and a polysorbate) are granulated and axially dry pressed to pellets, which are wet milled with a 0.5-mm-diameter tool. The structure's edge flaking is quantitatively determined and compared with previous results. The mechanical properties of the green and sintered bodies are also characterized. The strengths of the green bodies depend on their composition and treatment. Additionally, a correlation between the Weibull moduli of the green compacts and the moduli of the sintered parts is shown. For the sintered ceramics, Weibull strengths of up to 344 MPa can be achieved. It is also shown that the dimensional accuracy of the net-shape material is maintained.