FFD系列水基涂料

一、前言在砂型铸造中,正确地使用涂料,可以避免铸件表面粘砂,提高铸件光洁度。在特殊条件下,还可用涂料使铸件表面合金化。在金属型铸造中使用涂料,能改善和控制铸件的冷却速度,提高铸件质量。还能减轻金属液的冲击作用,提高金属型使用寿命。水基涂料是铸造生产中使用最广的涂料。传统的水基涂料配制方法简单,但缺点很多,主要有:     

努力提高我厂铸造生产技术水平

贵阳铸造厂是在发展贵州柴油机制造业中为相应提高铸造水平而兴建的。20多年来,我厂一直生产发动机类铸件,更擅长生产缸体、缸盖、球墨铸铁曲轴铸件,这些产品畅销省内外,享有质量声誉。现主要产品有135系列柴油机铸件及东风—140发动机铸件,年产合格铸件7500吨。“七五”期间,为适应主机厂发展要求,我厂铸造生产能力将扩大到年产合格件两万吨以上,也将新增以仿西德“本茨”OM407型的国产6125型柴油机为代表的其它产品。由于这类产品技术要求高,产量又成倍递增,     

高铬铸铁件金属型—砂型复合铸造工艺

采用金属型－砂型复合铸造工艺生产高铬铸铁件,可提高铸件的表面和内在质量,是提高板锤抗磨性,延长其使用寿命的有效措施。     

大型电动轮机座制造工艺改进

电动轮机座为矿用自卸车的驱动轮机架,近年来使用时出现了机座铸件开裂、使用寿命短的问题,通过计算机模拟分析软件对叶轮的受力及铸造工艺进行分析,研究了机座铸件的受力状况以及铸造凝固特点,优化了产品结构及铸造工艺,解决了机座铸件开裂问题,提高产品寿命。     

金属型重力铸造条件下的铝合金铸件生产技术

为了可靠提高铝制铸件产品的性能和品质,基于金属型铸造热交换的特点,通过制定金属型铸造工艺规范、调整涂料配方等技术方案,控制金属型的预热及上下型的温差、浇注温度与开模时间等工艺参数,达到了提高金属型使用寿命和铸件品质的目的。     

渣浆泵前护板断裂原因分析及工艺改进

渣浆泵前护板因其结构的特殊性,出水口底部易出现缩孔气孔等铸造缺陷。通过对铸造缺陷深入分析原因和工艺改进,使前护板铸件内在质量和使用寿命均大幅提高。     

壳体铸件差压铸造工艺技术研究

差压铸造是在低压铸造的基础上发展起来的一项铸造技术,通过研究差压铸造的工艺特点和工艺参数的设计、操作工艺过程、以及铸造工装,将差压铸造应用于某壳体铸件的研制,解决了铸件内部质量问题,提高了铸件合格率。     

CG125摩托车发动机汽缸盖低压铸造模具结构的改进

分析了170F柴油机汽缸盖低压铸件生产中工艺操作和模具结构上存在的问题,在设计CG125摩托车汽缸盖低压铸造模具的结构中作了改进.型芯连体组合,各边模由6片金属叠合而成,边模与油缸端板采用卡扣连接,加强低压铸模排气和水冷,保证了摩托车汽缸盖低压铸件的质量,经济效益得到明显提高.     

浅议大型铸钢件浇注系统的设计

阐述了大型铸钢件浇注系统在设计不当时对铸件质量的影响,指出了铸造缺陷与浇注系统设计之间的关系,通过对用生产实践的总结找出了铸造缺陷的原因,提出了改进大型铸箱式结构铸件浇注系统的设计方法,保证了铸件质量的稳定提高.     

金属型铸造凝固过程温度场数学模型及定解条件的确定

一、概述 金属型铸造时生产量一般都很大，对铸件的质量要求很高，而且要求铸件是稳定的，也就是说同一副金属型中铸造出来的铸件质量应该是一样的。金属液的凝固过程对铸件质量影响很大，因此模拟凝固过程温度场的分布，对优化铸造工艺、预测与控制铸件质量和各种铸造缺陷，以及提高生产效率都非常重要。具体讲，凝固过程温度场模拟可实现如下目的。     

The influence of engine oil on diesel exhaust emissions

Increasingly stringent emission legislation, together with the requirements for improved diesel engine performance, such as fuel economy, friction reduction, and extended drain intervals, have led to attention being focused on engine oil quality. The use of low‐friction engine oils can improve engine fuel efficiency and lead to a significant reduction of gaseous emissions. Therefore, engine oil is of importance when considering engine design parameters. This paper describes a study of the contribution of engine oil to diesel exhaust emissions. The investigations have shown that diesel engine particulate emissions as well as hydrocarbons and NO_X emissions depend on the lubricant oil properties, in particular on the sulphur content, volatility, and metal content.     

新型减摩润滑剂改善汽油/柴油发动机动力性能的研究

利用合成和复配技术制备了新型减摩润滑剂，采用WD615型柴油发动机和C698QA型汽油发动机进行了全速全负荷的加速强化台架试验和300摩托小时的可靠性台架试验，考察了该润滑剂作为CD15W／40和SF10W／30机油添加剂对发动机功率、扭矩、机械损失、油耗等外特性的影响。结果表明：研制的减摩润滑剂在改善车辆发动机的动力性能和延长使用寿命方面具有良好的效果．与CD15W／40机油相比，该润滑剂能够使柴油发动机的功率、扭矩分别提高2．1％、2．0％．降低机械损失4％，节省油耗达1．8％；与SF10W／30机油相比，使用新型减摩润滑剂后的汽油发动机最人功率和最大扭矩分别升高了6．1％和2．0％，油耗降低了6．0％。这是由于该润滑剂充分利用了配方中多种功能添加剂的单剂特性和复合协同功效，提升了传统润滑油的减摩润滑性能和整体性能。     

The effect of biodiesel and ultra low sulfur diesel fuels on emissions in 11,000 CC heavy-duty diesel engine

It seems very difficult to comply with upcoming stringent emission standards in vehicles To develop low emission engines, better quality of automotive fuels must be achieved Since sulfur contents in diesel fuels are transformed to sulfate—laden particulate matters as a catalyst is applied, it is necessary to provide low sulfur fuels before any Pt-based oxidation catalysts are applied In general, flash point, distillation 90% and cetane index are improved but viscosity can be worse in the process of desulfunzation of diesel fuel Excessive reduction of sulfur may cause to degrade viscosity of fuels and engine performance in fuel injection systems This research focused on the performance of an 11,000 cc diesel engine and emission characteristics by the introduction of ULSD, bio-diesel and a diesel oxidation catalyst, where the bio—diesel was used to improve viscosity of fuels in fuel injection systems as fuel additives or alternative fuels     

柴油机风扇电子自动控制装置改进设计

针对柴油机对工作温度要求高、易损坏、寿命短,从而影响生产的情况,对柴油机风扇电子自动控制装置进行了改进设计,采用温度传感器进行水温检测,通过驱动电磁阀来实现对柴油机风扇的起动和停止操作,使柴油机的水温较为恒定,以保证设备的安全运行。     

Excavator energy-saving efficiency based on diesel engine cylinder deactivation technology

The hydraulic excavator energy-saving research mainly embodies the following three measures: to improve the performance of diesel engine and hydraulic component, to improve the hydraulic system, and to improve the power matching of diesel-hydraulic system-actuator. Although the above measures have certain energy-saving effect, but because the hydraulic excavator load changes frequently and fluctuates dramatically, so the diesel engine often works in high-speed and light load condition, and the fuel consumption is higher. Therefore, in order to improve the economy of diesel engine in light load, and reduce the fuel consumption of hydraulic excavator, energy management concept is proposed based on diesel engine cylinder deactivation technology. By comparing the universal characteristic under diesel normal and deactivated cylinder condition, the mechanism that fuel consumption can be reduced significantly by adopting cylinder deactivation technology under part of loads condition can be clarified. The simulation models for hydraulic system and diesel engine are established by using AMESim software, and fuel combustion consumption by using cylinder-deactivation-technology is studied through digital simulation approach. In this way, the zone of cylinder deactivation is specified. The testing system for the excavator with this technology is set up based on simulated results, and the results show that the diesel engine can still work at high efficiency with part of loads after adopting this technology; fuel consumption is dropped down to 11% and 13% under economic and heavy-load mode respectively under the condition of driving requirements. The research provides references to the energy-saving study of the hydraulic excavators.     

某海洋平台废气涡轮增压中冷柴油机提高性能探究

废气涡轮增压中冷柴油机广泛应用于海上油气开发,在柴油机运行过程中,增压后空气温度下降可以提高进气空气密度,进而提高柴油机功率以及效率。通过现场运行分析发现,随着柴油机功率提高和空冷器换热效率下降,增压空气温度上升,而柴油机低温水出口温度设定为50℃不变,导致了柴油机性能降低。本研究通过理论分析、实验等方式对该柴油机进气温度可变性进行分析研究,寻求最佳进气温度以提高主机燃油效率、降低排气温度及污染物排放。     

车用柴油机高原性能模拟试验及性能提升策略

通过柴油机高原性能模拟试验,分析了柴油机的动力性、经济性随海拔高度的变化规律,以及高原环境对柴油机起动性能和热平衡性能的影响,提出了高原增压、供油系统调整及优化、低气压低温起动、热平衡控制、电控柴油机高原标定等提升车用柴油机高原性能的技术对策,为研究进一步提高柴油机的高原环境适应性提供了参考。     

Effect of antioxidants on the oxidative stability and combustion characteristics of biodiesel fuels in an indirect-injection (IDI) diesel engine

Biodiesel fuels that consist of saturated and unsaturated long-chain fatty acid alkyl esters are an alternative diesel fuel produced from vegetable oils or animal fats. However, autoxidation of biodiesel fuels during storage is easily caused by air, reducing fuel quality by adversely affecting its properties such as kinematic viscosity and acid value. One approach to improve the resistance of biodiesel fuels to autoxidation is to mix them with antioxidants. This study investigated the effectiveness of five such antioxidants in mixtures with biodiesel fuels produced by three biodiesel manufacturers: butylated hydroxytoluene (BHT), butylated hydroxyanisole (BHA), tert-butylhydroquinone (TBHQ), propyl gallate (PrG) and α-tocopherol. An engine test was also performed to investigate the combustion characteristics of biodiesel fuel with antioxidants in an indirect-injection (IDI) diesel engine. Oxidation stability was determined using Rancimat equipment. The results showed that TBHQ, BHA, and BHT were the most effective and α-tocopherol was the least effective in increasing the oxidation stability of biodiesel. The combustion characteristics and exhaust emissions in diesel engine were not influenced by the addition of antioxidants in biodiesel fuel. This study recommends TBHQ and PrG to be used for safeguarding biodiesel fuel from the effects of autoxidation during storage.     

汽车用燃油的清洁度浅析

车用燃油的清洁度是治理汽车污染的重要因素。对燃油的品质加以控制,不但能够达到国标要求,还能减少汽车发动机的故障率,延长汽车发动机的寿命。分析并探讨燃油清洁度对汽车的影响,提出了提高燃油清洁度的途径。     

柴油发动机高压共轨喷射系统介绍

近年来柴油发动机高压喷射及其电控技术的快速发展,使柴油机在油耗、功率、扭矩和尾气排放方面显现出越来越明显的优势。国外发展趋势表明,柴油机在市场中的份额将会越来越大。通过对德国西门子公司VDO汽车零部件部门研制开发的第二代采用压电石英元件的共轨喷射系统的介绍,让读者了解到柴油共轨喷射系统的最新科技与发展动向,为国内柴油发动机技术革新与生产加工提供一定的帮助。