共查询到19条相似文献,搜索用时 46 毫秒
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喷油嘴针阀体的制造工艺 总被引:2,自引:0,他引:2
喷油嘴是大功率进口柴油机的一个重要且易损耗的部件,进口喷油嘴价格较贵,文中介绍了能应用于进口柴油机(如火力发电机组、轮船用柴油机)的喷油嘴针阀体的制造工艺。 相似文献
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一拖集团油泵分厂引进了2台瑞士产12工位机床(DR-12),用于加工喷油嘴针阀体(ZCK150J427-00-02).有3种挖槽刀是该机床加工针阀体的必备刀具,因随机进口刀具在使用一段时期后磨损报废,导致机床陷于停机状态.由于该挖槽刀的制造和刃磨相当困难,国内无货可供,而向国外采购不但价格昂贵,且供货周期无法保证.因此,实现该刀具的国产化研制成为我厂的一个重要技术课题,为此成立了专门的课题小组. 相似文献
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电动工具齿轮断裂失效分析 总被引:1,自引:0,他引:1
对于电动工具齿轮的断裂失效现象,采用维氏硬度计测定齿轮硬度,光学显微镜和扫描电子显微镜观察轮齿金相组织和断口形貌,并对观测结果进行分析。分析表明,轮齿断裂失效主要是由于材料强度和硬度不足而造成弯曲疲劳,并建议选择抗疲劳强度高的材材或对热处理工艺进行改进。 相似文献
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某化工机械轴承座检测试验中,在未达到使用标准情况下而发生疲劳断裂,出现早期振动疲劳损伤,以及在实际工作时偏心失衡或过载超负荷运行,而导致轴承座法兰产生疲劳裂纹扩展直至断裂。论文根据轴承座的基本结构和实际工况下受力进行分析研究,采用材料元素分析、光学显微镜等测试手段,从材料成分、断口形貌等角度,分析了轴承座断裂失效原因,为轴承座断裂失效及相关动力学研究提供了更可靠的理论和实际依据。 相似文献
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Zhang Jianming Zhang Weigang Yang Bing Wang Yawei 《Frontiers of Mechanical Engineering in China》2007,2(4):439-441
A force model of a control valve of injector is set up, and the changes of the fluid damping clearance are investigated on
the basis of the results of the computational fluid dynamics (CFD) and the experiments of control valve of injector. Results
indicate that a damping clearance of 0.02–0.03 mm between the poppet and the valve guide is the most sufficient to dampen
any excessive control valve poppet bouncing.
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Translated from Journal of Shanghai Jiaotong University, 2006, 40(6): 1031–1034 [译自: 上海交通大学学报] 相似文献
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分析了阀门灰铸铁件以其表面硬度作为铸件力学性能验收标准的可行性和检验方法。介绍了灰铸铁件壁厚与其抗拉强度及表面硬度的对应关系。给出了阀门铸件表面硬度的检测部位及具体操作方法。 相似文献
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The increase in common rail pressure can lead to increased cavitation inside the injector, resulting in degradation of injector performance and reduced life. The paper investigates the effect of the pressure block structure parameters (initial flow area around the ball valve) on the velocity field, pressure field, fuel gas phase volume fraction and drain rate of the control valve. The relationship between the initial flow area around the ball valve on the cavitation strength and unloading rate inside the valve was revealed. The results show that both the reduction of the flow area around the ball valve and the increase of the cavitation intensity inhibit the rate of oil discharge from the control valve. The reduction of the fuel flow area inhibits the expansion of the low-pressure region (0–1 MPa) within the flow layer, thus limiting the development of cavitation. The reduction of the cavitation area increases the fuel flow rate, however, the increase in flow rate increases the cavitation phenomenon, and these changes form a cycle (Reviewer 5. comment 2). The increase in cavitation inhibits the control valve pressure relief rate more significantly than the decrease in the initial flow area around the ball valve. Based on this, a stepped-pressure block model is proposed. The stepped pressure block model can effectively reduce the cavitation strength near the seal and enhance the oil discharge rate of the control valve. The study can provide a reference for the engineering optimization design of high-pressure common rail injector control valves. 相似文献
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通过研究ASME、ISO等国际标准对安全阀动作性能试验和排量试验的内容和方法,阐述了建立安全阀试验台基本的相匹配参数和必要性。 相似文献
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介绍了双隔离管线球阀腔体泄放压力在相关标准中的规定。提出了阀门泄放压力超过失火状态规定的额定压力许用值及存在的潜在危险。分析了双隔离管线球阀在非正常工况下压力边界可能失效的原因。 相似文献