2050热连轧机组油膜轴承锥套损伤的边界元分析

利用弹性接触问题边界元法分析了轧机油膜轴承锥套的变形和载荷特性、载荷和变形对锥套损伤的影响，改进了锥套结构，并对改进后的锥套进行分析，给出两种锥套的比较结果。     

降低预精轧锥套消耗的探索与实践

介绍了新钢线材厂预精轧机锥套消耗情况，比较详细地阐述了锥套消耗高的各种因素，提出了一些降低锥套消耗的有效办法和措施。     

Φ2 200 mm圆锥破碎机锥套裂纹的原因分析及预防

文章简述了φ200mm圆锥破碎机运转时圆锥主轴与锥套的接触特点,提出了造成锥套产生裂纹的几个原因,对其形成机理进行了分析,并提出了防止锥套裂纹产生的安装、检修、维护措施.     

加工圆锥形工件的新方法

切削加工中经常会遇到圆锥形工件。加工这类工件时对拖板角度的校正是个关键。通常在车削圆锥体或镗锥孔时都用圆锥样套或样规来塞配,要反复拔校拖板的角度;锥套(锥规)经常不断地与加工件不光滑的锥面磨擦,时间长了会影响锥套与加工件的精度;另外,有的工件锥形部分大小两端的尺寸较大,没有锥套或来不及做锥套,要靠测量两端的尺寸来决定是否车准,又要反复地校正拖板的角度。     

锥套与锥套件过盈配合的冷装方案

锥套是油膜轴承产品的关键件,为了满足用户不断提升的使用要求,锥套的设计精度及锥套与锥套键的装配设计要求也在不断地提高。机械产品过盈配合的装配方案有三种:压装、热装、冷装。对于锥套与键的装配结构,沈冶公司首次尝试大型高精度产品的冷装方案,因此,在提高装配效率,确保产品装配质量,降低制造成本的同时,也填补了此种大型高精度产品的冷装配制造空白。     

锥套在立车的数控化工艺优化

锥套是油膜轴承中主要部件之一,因其使用环境决定,锥套有着非常高的参数要求,这样就要求具备强大的加工设备以及先进的工艺路线来保证。锥套的加工工序是非常复杂的,在整个工序中立车是特别重要的角色,立车是为最后一道工序磨床序打基础的设备,通过对立车加工工艺的优化,最终实现锥套加工的最优工艺路线,提高锥套产品的性能参数和使用寿命。     

混合机托辊锥套防松装置研究改造

针对混合机托辊轴失效形式及原因进行分析,并设计出了新型混合机托辊锥套防松装置,彻底解决了托辊轴承的锁紧螺母和锥套松动的问题。     

油膜轴承锥套过盈配合的有限元分析

采用接触问题有限元法分析了油膜轴承锥套的过盈配合,通过ANSYS10.0进行计算机模拟,计算出了过盈配合中锥套的应力分布,为过盈配合的联结强度分析和优化设计提供了可靠理论依据。     

高线预精轧机锥套的失效分析

本对锥套断裂和磨损的原因进行定性分析，着重对锥套断片和磨损两种失效形式进行探讨，找出对策。     

油膜轴承变形和压力分析

轧机油膜轴承最新试验结果表明,实测油膜厚度比计算机模型预测值大3~5倍。这意味着,油膜厚度增加是由于锥套和衬套变形的结果,这种变形会导致锥套和衬套压力场扩大,进而导致油膜厚度增加。如果油膜厚度真的比预想的高3~5倍,则不但可以充分利用轴承固有的安全系数,而且还可以提高轴承的最大运行负荷。为确认试验结果,DanOil油膜轴承工程师构建了因液体动压场变化而导致的锥套变形模型,然后将这种变形用于复杂的计算机轴承模拟程序,来计算新的压力场。对压力场和锥套变形进行重复迭代计算,直到计算结果收敛为止。介绍了这一分析方法和计算结果。     

薄壁轴套装配尺寸的选择与加工

加轴套修复轴是常用的修复方法。在确定轴套外径尺寸偏差时,特别是在轴套为薄壁的情况下,必须充分考虑到因轴与轴套安装后轴套外径的扩张量,才能使轴套外装配的工件达到正常使用要求。     

Effect of a neoprene sleeve on knee joint position sense during sitting open kinetic chain and supine closed kinetic chain tests

The primary objective of the present study was to compare the effect of a neoprene sleeve on knee joint position sense during a sitting open kinetic chain test and a supine closed kinetic chain test. Young (24 +/- 2 years old), healthy subjects (18 men and 18 women) performed knee joint angle replication tests during open kinetic chain knee extension (sitting) and closed kinetic chain leg press (supine with an axial load of 15% body weight) before and after application of a neoprene sleeve over the dominant knee. The improvement in ability to replicate joint angles after application of the sleeve (sleeve effect) was significantly less during the supine closed kinetic chain test (0.3 degree +/- 1.4 degrees) than during the sitting open kinetic chain test (1.2 degrees +/- 1.1 degrees). The sleeve effect was inversely related to subjects' performance without the sleeve during both the sitting open kinetic chain and supine closed kinetic chain tests, suggesting that some people may derive greater benefit from the sleeve than others. Although the sleeve effects were small, particularly during the supine closed kinetic chain test, 72% of subjects felt that the sleeve improved their overall test performance. Future research is needed to establish the functional relevance of the small sleeve effects observed and to identify the characteristics of people who might derive greatest benefit from sleeve use.     

ZA12锌铝合金挤压轴套的研制

采用挤压法试验生产ＺＡ１２锌铝合金轧套，制品表面光洁、无裂纹、显微组织和机械性能均优于铸件，耐磨性能优于ＺＱＳｎ６－６－３；与铸造法相比可节约材料费用５４％。     

球形轴承轴套的焊接修复

介绍了滑动轴承轴套存在的问题,叙述了轴套焊接修复的详细过程。通过制定合理的修复工艺,成功地对轴套实施修复,解决了问题,取得了很好效果。     

Correction factors for water-proofing sleeves in kilovoltage x-ray beams

This paper investigates the effect of the waterproofing sleeve on the calibration of kilovoltage photon beams (50-300 kV). The sleeve effect correction factor, ps has been calculated using the Monte Carlo method as the ratios of the air kerma in an air cavity of a cylindrical chamber without the waterproofing sleeve to that with a sleeve. Three sleeve materials have been studied, PMMA, nylon and polystyrene. The calculations were carried out using the EGS4 (Electron Gamma Shower version 4) code system with the application of a correlated-sampling variance-reduction technique. The results show that the sleeve correction factor for 1-mm thick nylon and polystyrene sleeves, ps varies from 0.992 to 1.000 and from 0.981 to 1.000, respectively, for the same beam quality range. The ps factor varies with sleeve thickness, beam quality and phantom depth. No significant dependence of the ps factor on field size and source-surface distance has been found. Measurements for PMMA, nylon and polystyrene sleeves of various thicknesses have also been carried out and show excellent agreement with Monte Carlo calculations.     

高炉风口小套供水系统的优化措施

风口小套是高炉的关键设备,是热交换极为强烈的冷却元件,其在高温状态下不间断地受到液态渣铁和煤粉的冲刷,是高炉易损的设备。风口小套的破损与更换已成为高炉无计划休风增多的主要原因,针对如何优化风口小套供水条件来提高风口小套使用寿命,进行探讨。     

开缝衬套挤压工艺影响TA15孔疲劳增益研究

采用对比疲劳试验方法,研究了相对挤压量、终铰参量、衬套开缝放置角度等工艺参数和特征对开缝衬套挤压TA15钛合金连接孔疲劳增益的影响。结果表明,开缝衬套挤压技术可有效提高TA15钛合金孔结构疲劳强度,延长其疲劳寿命；相对挤压量越大,孔挤压疲劳增益越大,但是TA15钛合金对挤压量非常敏感,微小的相对挤压量波动会导致显著的疲劳增益波动；在完全去除开缝衬套在孔壁遗留的材料凸脊前提下,0.190 mm和0.065 mm两种单边终铰参量对TA15孔结构挤压疲劳增益有明显影响,0.190 mm单边铰削量时挤压疲劳增益更大,而非终铰参量越小越好；在s_max=400 MPa,R=0.1疲劳载荷条件下,衬套开缝与试样最窄截面平行放置,仍能够获得明显的疲劳增益,但相对于与试样与最窄截面呈90°放置,疲劳增益会略有下降,建议在实际孔挤压操作中,衬套开缝尽量避开最窄截面放置。     

精轧机扁头套失效影响因素分析及其改进

针对宝钢分公司2050热轧精轧机扁头套使用寿命低的问题,分析了扁头套的自身质量及精度,扁头套与轧辊扁头间的间隙冲击扭振,工作辊直径误差等方面对精轧机扁头套失效的影响,进而制定提高扁头套的额定传递扭矩,减小间隙冲击扭振,减小工作辊的"上压"或"下压"等改进措施并加以实施,从而使扁头套的使用寿命提高了一倍.同时还通过对间隙冲击扭振对扁头套失效影响的分析,提出间隙冲击扭振问题是精轧机机械传动系统失效的关键.     

套筒窑在电石炉尾气煅烧石灰工艺中的应用

论述了套筒石灰窑的煅烧工艺特点及电石炉尾气回收利用的必然性。通过对几种先进的石灰窑型进行比较,突出了套筒石灰窑的优势及利用电石炉尾气煅烧高品质生石灰工艺的合理性。该套筒石灰窑建设投运后取得了很好的节能降耗效果,为套筒石灰窑与新型密闭电石炉配套应用提供了很好的借鉴。