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1.
Based on the phase transformation theories, especially the T0 concept of bainite transformation, alloy optimisation of bainitic steel with carbides has been carried out aiming at the produce of plastic mould with large cross-section. The effect of manganese and silicon on proeutectoid ferrite and bainite transformation is explored by dilatometric analysis, XRD and different microscopy techniques. The results show that after the alloy optimisation, the transformation of proeutectoid ferrite is suppressed and when the cooling rate is lower than 0·1°C?s??1, the new lower bainite transformation appears by decreasing carbon capacity of austenite and promoting carbide precipitation. Industrial production proves that the optimised alloy SDP1 can meet the demand for the plastic mould with the thickness of 1050?mm. 相似文献
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Controlling the formation of longitudinal cracks on hypo-peritectic steel slab surfaces is one of the key challenges in continuous casting worldwide. Based on the production in Chongqing Iron & Steel Co., mould fluxes with high basicity ranging from 1.7 to 1.8 were put forward and the effects of compositions on the basic properties of mould flux were studied in the present paper. After laboratory experiments, a high-basicity mould flux with an increased crystallisation speed to abate the heat-transfer capability in the meniscus area was fully applied in the first steelmaking plant of Chongqing Iron & Steel Co. Using the high-basicity mould flux, for more than 3 million tonnes of slab production, the large longitudinal crack was eliminated and the rate of formation of small longitudinal cracks decreased greatly. During the production process, sticking that impedes the smooth running of continuous casting was infrequent, and the spot check for longitudinal cracks on micro alloy steel surface was simplified in the slab finishing process. Furthermore, since the application effect of mass production is remarkable, the hot charging process is better implemented, and the contract can be accomplished in time. In summary, the problem of longitudinal cracks on hypo-peritectic steel slab surfaces is finally resolved and the high-basicity mould fluxes have become indispensable auxiliary materials during continuous casting of hypo-peritectic steel. 相似文献
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VIVIANA B SUÁREZ GUSTAVO J TREMMEL MAURICIO RIVERA JORGE A REINHEIMER CARLOS A MEINARDI 《International Journal of Dairy Technology》2012,65(3):410-415
A novel treatment using polyphosphates to protect cheeses against superficial mould growth was assayed. The treatments were: control commercial paint with natamycin (I), commercial paint based on polyvinyl–water (II), immersion in a saturated solution of polyphosphate (III), immersion and commercial paint (IV), commercial paint of polyphosphate solutions (V) and immersion and commercial paint of a saturated solution of polyphosphates (VI). The cheeses were ripened for 6 months. Superficial mould growth was inhibited in groups IV and VI when compared to cheeses from the control group (I). Statistical sensory analysis made between cheeses from groups IV and I (control) showed no significant differences. 相似文献
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针对目前高职模具CAD课程的现状,以培养学生的职业能力为目标,提出基于工作过程的课程建设方案,将CAE课程纳入其中,整合成模具CAD/CAE课程。通过对模具CAD/CAE课程的教学结构设计、教学方法与手段探讨及考核方式的改革,完成了模具CAD/CAE课程的开发。通过教学实施,模具CAD/CAE课程的建设取得了成功。 相似文献
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介绍了轻质耐火保温纤维、高温红外辐射涂料和蓄热式高温空气燃烧技术等工业加热保温节能新材料新技术的发展及其在国内熔模铸造型壳焙烧炉中的应用实例和节能效果。指出黑体炉衬材料与蓄热式高温空气燃烧技术相结合的加热炉是熔模铸造型壳焙烧炉的重点发展方向。 相似文献
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通过对电机支座的分析,采用Pro-E设计电机支座的模具,对设计出的模具在MasterCAM中编写数控代码并进行仿真加工.使用该模具制造出的支座完全满足设计要求,并在实际使用中得到了验证. 相似文献
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《钢铁冶炼》2013,40(1):25-31
AbstractUnderstanding the shrinkage behaviour of a steel billet is very important for designing the continuous casting mould, and conversely, a well designed mould is beneficial when matching the shrinkage behaviour of the billet. The shrinkage behaviour of a billet is hard to measure in situ during continuous casting but can be calculated by numerical simulation. A three-dimensional finite element model has been built to simulate the thermal and stress fields of the billet in the mould. The dynamic thermal boundary condition, the effect of ferrostatic pressure and the temperature dependent thermophysical parameters have been considered in the model. The shrinkage of billet when considering ferrostatic pressure is on average 0·08 mm smaller than when not considering ferrostatic pressure. The temperature and stress distributions are analysed in the present paper, and based on this analysis, a novel petal-like mould was designed and its taper determined. The designed mould has been tested in industrial practice showing better lifetime and billet quality. 相似文献
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