货车车体磨料水射流除锈的研究

磨料水射流清洗这种新工艺研究应用在货车车体上,对铁路货车的表面进行处理,即除锈、除漆及污物,提高了货车表面处理质量和处理速度,降低了工人的劳动强度,对表面处理所采用的介质水和磨料进行回收处理并循环使用,成本低且对环境无任何不良影响。     

高压水射流技术在石化设备清洗、除锈中的应用

针对石化行业特有的大量静设备，如容器、管道的清洗，贮罐、球罐的除漆除锈等问题，提出以高压、超高压水射流技术诸一解决的对策。高压水射流用于石化行业清洗虽已成为我国各大企业的常规应用技术，本文主要介绍：等功率超高压变速泵的清洗应用、磨料水射流与爬壁机器人对钢质表面除锈。     

高压水射流除锈装置的试验研究

论述了高压水射流除锈装置参数优化与型式特点、各参量与除锈、切割的关系,进而分析了磨料射流除锈新工艺替代喷砂除锈工艺的必然趋势。     

喷涂挂具回用的绿色除漆清理技术

高压磨料水射流(AWJ)具有较高的切除能力和效率，并且不改变加工件物理结构和化学成分，是一种十分典型的绿色制造技术，它在异种材料的剥离去除或除锈、去磷化皮、除喷漆层等清理工作中独显优势。通过对涂装挂具去漆清理的实际应用研究与试验表明，用磨料水射流取代原来的高温焚除除漆工艺，具有效率高、除漆干净彻底、工艺简便、设备简单、工序少、纯绿色环保的特点。     

磨料水射流切割技术研究现状及其发展趋势

介绍了高压水射流技术的基本原理,分析连续射流和脉冲射流的原理和特点,并归纳总结了高压纯水射流和磨料水射流的不同特点,概括了磨料的两种不同混合方式的原理和特点,并介绍高压水射流作为新兴工艺技术在除锈和切割领域的应用。     

并联柱塞泵水射流系统的研制和工程应用

水射流雾化制粉工艺和冷态钢材的磨料水射流除除鳞除锈工艺是典型的并联水射流系统工程应用,系统的流量脉动直接影响系统的工艺应用。本文介绍了上述2种典型并联水射流系统的研制,分析总结了泵的相位偏角差值对并联柱塞泵水射流系统流量脉动影响,认为泵之间存在最佳相位偏角使并联柱塞泵水射流系统的流量脉动率得到降低。     

磨料水射流抛光技术的研究现状

磨料水射流抛光是新出现的一种精密加工技术。本文综述了国内外学者对磨料水射流抛光技术的研究情况,介绍了磨料水射流抛光机理和各工艺参数对抛光效果的影响,指出了目前磨料水射流抛光加工中存在的问题。     

微细磨料水射流切割技术的研究进展

产品小型化和加工过程微型化是现代制造加工业的发展趋势,为适应微器件的精加工,在常规磨料水射流切割技术基础上,微细磨料水射流切割技术逐渐改进和发展起来了。微细磨料水射流直径在1~100 μm之间,比常规磨料水射流直径(500~1200 μm)小一个数量级,其割缝宽度、表面质量已达到激光切割的加工水平。微细磨料水射流特别适合对金属、陶瓷、半导体以及高分子聚合物等难加工的硬脆材料进行微细加工,是一种具有广阔应用前景的全新微型加工技术。为了解该项技术的最新发展情况,该文介绍了微细磨料水射流的特点、射流的生成方式及切割机理,以及影响切割性能的主要参数和部分工业应用实例,最后提出了微细磨料水射流切割技术有待深入研究的问题和今后的发展趋势。     

高压水射流除锈设备模糊综合评判

高压水射流除锈设备的选择取决于诸多因素,基于模糊数学理论,建立高压水射流除锈设备模糊综合评判模型,将各因素综合在一起并予量化,做出科学合理的设备评价,能为选购合适设备提供依据。     

基于稳健性设计的磨料水射流参数优化

磨料水射流加工技术是非传统的加工技术,它依靠高压、高水速和高速砂粒磨料作用在工件上去除材料,而在磨料水射流切割加工过程中存在切割深度和表面粗糙度较难控制的问题。基于稳健性设计理论、变量分析和信噪比,利用L9正交试验,对磨料水射流的压力、磨料流量、靶距和磨料粒径等加工过程参数进行优化。分析了加工参数的影响优先级,得出了磨料水射流加工参数的最优值,建立了切割深度信噪比回归模型并通过检验证明模型可靠。稳健性设计前后结果对比表明,切割深度和表面粗糙度比优化前有明显提升,从而提升了磨料水射流的加工质量。在实际加工不锈钢304中验证了结果的可靠性和该方法的可行性,为磨料水射流加工技术的推广提供了指导。     

基于FLUENT的高压水射流除锈的流场仿真及射流参数优化

利用高压水射流船舶除锈取代目前的人工打砂除锈势在必行。介绍了水射流的基本结构并根据高压纯水射流除锈的工况,利用计算流体动力学（CFD）方法对高压水射流进行了模拟仿真。通过仿真介绍了流场中高压水射流的特性以及靶面的受力情况。最后,为了达到良好的除锈效果,对高压水射流的靶距和入射角度进行优化,得出在指定条件下最优靶距应为15 ~20 mm,最优入射角度（射流与靶面法线的夹角）应为30°。     

精准外科视域下射流分离技术的研究综述

医用射流分离技术作为现代科技与传统外科的融合和优化,其研究工作对于精准外科发展具有建设意义。综述了射流分离装备的发展过程和技术路线,总结了现有射流技术现状及其研究方法,分析了医用射流分离研究的不足之处,提出了射流技术实现临床精细应用的目标。     

Technical-economic evaluation of abrasive recycling in the suspension fine jet process chain

Abrasive waterjet generation methods such as the conventional injection jet method and the suspension jet method have a strong influence on properties and costs of the machined products, particularly ones made of difficult-to-machine materials, e.g., ceramics. Since recycling may reduce the needed amount of materials significantly, the same holds true for recycling processes and technologies within the process chains of abrasive waterjet methods. In this paper, a methodology for integrated technical-economic evaluation of processes is presented and applied to the process technology of abrasive recycling in the suspension fine jet process chain aiming to show the technology’s technical as well as economic potential. Research and development regarding such processes and technologies may contribute to gain competitive advantages for companies as they can differentiate from competitors by offering or processing materials with distinctive properties and/or lower prices causing customer’s benefit. Consequently, it is also of great importance for companies applying waterjet cutting methods to know whether and which recycling technologies are promising from both a technical and an economic point of view. Experiments show that a significant share of the input material (abrasive particles) can be reused after recycling. The monetary appraisal reveals that technical potential results in considerably lower costs compared to the suspension jet method without recycling.     

Abrasive Waterjet Machining Simulation by Coupling Smoothed Particle Hydrodynamics / Finite Element Method

In dealing with abrasive waterjet machining(AWJM) simulation,most literatures apply finite element method(FEM) to build pure waterjet models or single abrasive particle erosion models.To overcome the mesh distortion caused by large deformation using FEM and to consider the effects of both water and abrasive,the smoothed particle hydrodynamics(SPH) coupled FEM modeling for AWJM simulation is presented,in which the abrasive waterjet is modeled by SPH particles and the target material is modeled by FEM.The two parts interact through contact algorithm.Utilizing this model,abrasive waterjet with high velocity penetrating the target materials is simulated and the mechanism of erosion is depicted.The relationships between the depth of penetration and jet parameters,including water pressure and traverse speed,etc,are analyzed based on the simulation.The simulation results agree well with the existed experimental data.The mixing multi-materials SPH particles,which contain abrasive and water,are adopted by means of the randomized algorithm and material model for the abrasive is presented.The study will not only provide a new powerful tool for the simulation of abrasive waterjet machining,but also be beneficial to understand its cutting mechanism and optimize the operating parameters.     

APPLICATION OF FUZZY LOGIC FOR MODELING OF WATERJET DEPAINTING

The presented work is concerned with numerical modeling of waterjet surface processing. More specifically, it is concerned with modeling of the waterjet paint stripping. An experimental database, containing water pressure, standoff distance, traverse rate and the strip width (the width of the region where paint was completely removed by the moving jet) was acquired. The Fuzzy Logic technique was used to construct routines relating input variables with the strip width. An additional database was acquired in order to evaluate the accuracy of the prediction. The error ranges from 1 % to 7% in the tested parameter space. The presented study showed that the application of Fuzzy Logic for modeling of the waterjet surface processing is practical.     

Abrasive waterjet machining simulation by SPH method

Abrasive waterjet machining (AWJM) is a non-conventional process. The mechanism of material removing in AWJM for ductile materials and existing erosion models are reviewed in this paper. To overcome the difficulties of fluid–solid interaction and extra-large deformation problem using finite element method (FEM), the SPH-coupled FEM modeling for abrasive waterjet machining simulation is presented, in which the abrasive waterjet is modeled by SPH particles and the target material is modeled by FE. The two parts interact through contact algorithm. The creativity of this model is multi-materials SPH particles, which contain abrasive and water and mix together uniformly. To build the model, a randomized algorithm is proposed. The material model for the abrasive is first presented. Utilizing this model, abrasive waterjet penetrating the target materials with high velocity is simulated and the mechanism of erosion is depicted. The relationship between the depth of penetration and jet parameters, including water pressure and traverse speed, etc., are analyzed based on the simulation. The results agree with the experimental data well. It will be a benefit to understand the abrasive waterjet cutting mechanism and optimize the operating parameters.     

PENETRATION ABILITY OF ABRASIVE WATERJETS IN CUTTING OF ALUMINUM-SILICON CARBIDE PARTICULATE METAL MATRIX COMPOSITES

This article presents a set of studies performed on aluminum-silicon carbide particulate metal matrix composites prepared by adding 5, 10, 15 and 20% of SiC in aluminum alloy and processed with abrasive water jets that are formed with garnet and silicon carbide abrasives of 80 mesh size. These studies are essentially meant to assess the penetration ability of abrasive water jets on different compositions of Al-SiC _p MMCs produced by stir casting method. Abrasive waterjet cutting experiments were conducted on trapezoidal shaped specimens of different composites as well on the constituent materials i.e., 100% aluminum alloy and 100% SiC specimens by varying water pressure, jet traverse speed and abrasive mass flow rate, each at three different levels. The percentage contribution of individual and combined effects of process parameters on penetration ability was analyzed by means of analysis of variance. Contribution of waterjet pressure and traverse speed on jet penetration in these meaterials are found to be more than abrasive flow rate. Among the interaction effects, waterjet pressure and jet traverse speed combinations contribute more to jet penetration. The results presented in this study can be used to build statistical models that can predict the depth of penetration of jet in different MMCs. This study also highlights the need to choose suitable abrasive mass flow rates and jet traverse speeds for effective processing of MMCs with abrasive water jets.     

基于淹没环境的超高压后混合磨料水射流切割试验研究

利用超高压水射流切割试验系统,在80～280MPa压力范围内进行淹没磨料水射流切割试验研究,通过试验及数据分析,验证了后混合淹没磨料射流切割的可行性,得出了磨料粒径和质量流量、射流压力、靶距、切割横移速度等参数对射流切割性能的影响规律,对于脆性和塑性材料,试验中各参数对切割深度的影响基本一致.结果表明:在试验给出的工况条件下,磨料流量存在最佳值,在一定范围内切割深度随磨料流量增加而增加,当磨料流量达到一定值后,切割深度随流量增加反而下降;切割深度与射流压力基本呈线性增长关系;随着靶距的增大,切割深度逐渐减小;切割深度随切割速度的增加呈指数衰减趋势,并且相同试验工况下淹没射流切割深度要大于非淹没状态.试验结果为超高压淹没磨料水射流的实际应用和研究提供了参考.     

淹没水射流冲蚀性能试验研究

试验研究了靶距、射流压力，冲蚀时间及淹没水深对射流性能的影响关系，对淹没水射流冲蚀性能作了全面分析，并将试验结果进一步应用于清洗工程中，取得了较好效果。     

磨料水射流切割混凝土的深度预测模型

在对磨料水射流切割混凝土分析基础上,应用BP人工神经网络理论,建立磨料水射流切割基于射流压力、靶距、磨料粒径、磨料流量、磨料喷嘴直径、磨料喷嘴长度及横移速度等射流参数的深度模型,通过模型预测结果与实验结果的比较,验证模型具有一定的精度,为实际运用和进一步研究提供参考。