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1.
邵堃  孔国利 《机床与液压》2018,46(22):16-20
高速主轴在工作过程中易受热变形影响数控机床加工精度,而角接触球轴承作为高速主轴的支承件发挥着巨大的作用。根据Hertz接触力理论,结合角接触球轴承受力平衡以及位移方程,建立角接触球轴承对主轴位移影响的分析模型,然后通过对比用模型计算的轴套位移值与用位移传感器测得的轴套位移值来进行验证;最后分析计算不同转速下轴承内外圈接触力和轴承刚度的影响,以及不同转速下对轴套和主轴位移产生的影响。利用该模型可以设置合理的预紧载荷以及主轴转速,提高轴系的运动定位精度,为轴承预紧量的施加、工作预紧载荷的调整及预紧装置的设计提供参考,弱化轴承塑性变形导致的热变形,从而降低对高速主轴变形位移产生的影响。  相似文献   

2.
陈玉莲  李俊文 《机床与液压》2020,48(14):167-170
高速角接触球轴承在高速运转条件下生热主要是由于滚子与滚道相互摩擦引起的,其中转速、载荷、材料和润滑状态等都是主要的影响因素。根据滚动轴承生热计算模型,基于MATLAB计算平台对航天器高速角接触球轴承B7005进行生热计算。另外,基于ANSYS有限元分析平台对轴承进行温度场仿真分析。最后比较两种方法的结果,分析表明,理论计算与有限元分析结果接近,验证了所介绍的温度场仿真分析方法具有较高的可靠性,也是热-结构耦合分析和寿命分析的重要基础。  相似文献   

3.
在10000r/min的高速状态下,考虑了滚动体与套圈滚道的结构弹性变形与动态接触关系,求解角接触陶瓷球轴承接触应力和变形,分析动力稳定性。采用有限元计算方法对高速陶瓷球轴承进行接触分析,对该轴承接触表面应力与变形的计算和仿真运动分析,绘制等效云图并将该轴承应用于高速主轴性能测试。基于ANSYS接触理论得出滚动接触体之间的相对滑动现象及其滚动体与套圈滚道相对运动关系,结果与已有的轴承运动的理论和实际情况相吻合。通过有限元计算模型表明对轴承的应力分布和动态响应是可行的,可以看出ANSYS对轴承的滚动接触理论分析有一定的指导意义,为进一步研究轴承动力学特性提供了更可靠的依据。  相似文献   

4.
为了改善滚动轴承-高速电主轴系统特性分析中对轴承只取其刚度和阻尼元素参与计算的情况,引入滚动轴承预紧力参数,建立用于轴承转子系统特性分析的滚动轴承预紧力约束方程,从理论上计算预紧力对系统刚度、临界转速和轴承性能的影响.以角接触球轴承-高速(60 000 r/min)电主轴系统为对象,设计一种预紧力测量方法,通过实验研究轴承预紧力对轴承转子系统的影响,结果表明测量结果与理论计算基本一致.  相似文献   

5.
角接触球轴承由于其摩擦和磨损性能好而特别适合于高速加工。本文介绍的油气最小量润滑方式可通过新型的输入方法使极限转速提高20%。另外,采用混合轴承和陶瓷滚动体轴承还可达到更高的转速上限。  相似文献   

6.
在轧机装备的设计过程中,对角接触球轴承的静特性分析是进行轴承动特性计算,确定轧辊轴承选型的首要工作。本文基于Hertz点接触理论建立了球轴承的静力学平衡方程,并对角接触球轴承的接触角分布、接触载荷分布、接触变形、轴承内外圈位移及刚度进行了计算。以轧辊轴承FAG-7206B-TVB为研究对象,对其进行静态特性数值分析,并将计算结果与传统简化算法进行了比较,验证了本方法在进行角接触球轴承静特性分析的有效性和精确性。  相似文献   

7.
主要从额定静载荷、滚动接触疲劳寿命、高速条件下的旋滚比与温升特性等方面,对高速主轴用混合陶瓷球轴承性能进行了分析,表明混合陶瓷球轴承在高速条件下比钢制轴承具有更加优良的性能。  相似文献   

8.
针对不同工况下热效应对高速角接触球轴承疲劳寿命研究的不足,首先对一般角接触球轴承进行了动力学分析;其次在ANSYS中建立了7008C轴承的有限元模型,并通过电主轴测温试验验证了模型的可靠性;最后综合分析了7种工况下载荷、转速对轴承温升的影响。得出随着转速升高或轴向载荷的增大,轴承的发热量增大,温度升高,润滑油的粘度降低,径向载荷对轴承的发热量及温升影响不明显。结果符合实际,为进一步轴承疲劳寿命的研究奠定了基础。  相似文献   

9.
针对柔性角接触球轴承的振动,建立计入波纹度的柔性角接触球轴承动力学模型,该模型考虑了润滑和轴承内外圈表面波纹度对轴承动力学的影响。在此基础上研究了轴承内外圈波纹度幅值对角接触球轴承振动的影响,仿真结果表明:角接触球轴承的振动随内外圈波纹度幅值的增加而增强,柔性环的振动比刚性圈体的振动大,波纹度阶数也会影响加速度的特征频率,且在旋转过程中产生的柔性变形加剧了内外圈波纹度对振动的影响。搭建轴承振动实验台,验证了动力学模型的正确性。  相似文献   

10.
为更加准确地描述高速电主轴轴承热位移和预紧力对其摩擦力矩的影响,建立角接触球轴承摩擦力矩数学模型。结合修正的拟静力学理论建立轴承受力平衡方程,分析轴承热位移和预紧力对轴承摩擦力矩的影响规律。结果表明:轴承热位移随转速的增加而增大,在高速条件下其值较大;轴承摩擦力矩随径向热位移的增加而增加,随轴向热位移增加而缓慢增加;轴承转速越低,轴承热位移对摩擦力矩的影响越明显;轴承摩擦力矩随着轴向预紧力的增加而增加;轴承热位移和预紧力对轴承差动滑动摩擦力矩影响最大,对自旋摩擦力矩影响次之,对弹性滞后摩擦力矩的影响最弱  相似文献   

11.
In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.  相似文献   

12.
The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.  相似文献   

13.
Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.  相似文献   

14.
After nearly two years' tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry (SRIF), located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.  相似文献   

15.
韩磊 《腐蚀与防护》2015,36(1):84-90,94
综述了常见的电化学噪声数据处理方法,介绍了直流趋势剔除、统计分析、快速傅立叶变换(FFT)法计算功率谱密度(PSD)以及小波变换处理电化学噪声信号的基本过程,并阐释了各种数学处理及所得参数的物理意义。  相似文献   

16.
Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.  相似文献   

17.
The motion of melt droplets in spray degassing process was analyzed theoretically. The height of the treatment tank in spray degassing process could be determined by the results of theoretical calculation of motion of melt droplets. To know whether the melt droplets would solidify during spraying process, the balance temperature of melt droplets was also theoretically analyzed. Then proof experiments for theoretical results about temperature of melt droplets were carried. In comparison, the experimental results were nearly similar to the calculation results.  相似文献   

18.
On the basis of the single-particle framework, a new theory on inclusion growth in metallurgical melts is developed to study the kinetics of inclusion growth on account of reaction and collision. The studies show that the early growth of inclusion depends on reaction growth and Brawnian motion collision, and where the former is decisive, the late growth depends on turbulence collision and Stokes' collision, and where the former is dominant; collision growth is very quick during the smelting process, lessened in the refining process, but nearly negligible in the continuous casting process.  相似文献   

19.
正Harbin General Hydraulic Machinery Works Co.,Ltd.of Yilin Hydraulic Group is the most professional production base of large-scale metallurgy oil cylinder and oil machinery cylinder in the Northeast of China.The main products include metallurgy cylinder,swell-shrink cylinder,rotating injection device,lifting cylinder,main lifting jack,front lifting jack,engineering oil cyl-  相似文献   

20.
<正>Copyright Information For Authors As soon as an article is accepted for publication,authors will be requested to assign copyright of the article(or to grant exclusive publication and dissemination rights)to the publisher(respective the owner if other than Springer).This will ensure the widest possible protection and dissemination of information under copyright laws.More information about copyright regulations for this journal is available at  相似文献   

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