Temperature measurement and surface burn out in grinding 1Cr11Ni2W2MoV high-temperature stainless steel
-
摘要: 针对高温不锈钢1Cr11Ni2W2MoV磨削过程中磨削区内部瞬时温度、磨削表面平均温度的测量方法以及工件表面平均温度与烧伤程度之间的关系进行了研究,分析了工件表面烧伤程度对材料金相组织的影响.通过研究得到了陶瓷结合剂CBN砂轮磨削1Cr11Ni2W2MoV时磨削区内部瞬时温度,证明工件表面的烧伤最直接因素是磨削表面的平均温度,在不同的磨削参数下,表面平均温度超过540 ℃就形成黄色的微烧伤,随着温度的升高,烧伤程度不断加重.同时,表面烧伤会使马氏体晶格变成细小的退火微晶变质层,烧伤越严重,微晶变质层的厚度越大.Abstract: The measuring method for the internal instant temperature and average temperature of grinding contact zone, as well as the correlation of the average temperature and burn extent in workpiece surface in the grinding process of high-temperature stainless steel (1Cr11Ni2W2MoV) were investigated, and the impact of the burn extent on the metallographic structure of workpiece surface was analyzed. In the process of grinding 1Cr11Ni2W2MoV using vitrified bond CBN grinding wheel, the internal instant temperature of grinding zone was obtained, the average temperature of grinding area proves to be direct influencing factor of the surface burn. Sufficient experiments under various grinding parameters prove that surface burn out only occurs when the average temperature exceeds 540℃, slight burn with yellow appearance occurs at 540℃ and gets more severe as the temperature increases. Meanwhile, surface burn out makes martensitic lattice turned into tiny annealing microcrystalline texture, and the thickness of microcrystal increases as the burn phenomena becomes more severe.
-
Key words:
- temperature measurement /
- grinding /
- surface burn out /
- burn mechanism
-
[1] Anon.Grinding big turbine blades[J].Manufacturing Engineering,2006,136(2):43-50 [2] Kalchenko V I,Piastro A M,Vlasov E I.Turbine blade grinding with abrasive bands[J].Energomashinostroenie,1984,76(2):16-18 [3] Wang Shibin,Hongsen Kou.Selections of working conditions for creep feed grinding PartⅡ:Workpiece temperature and critical grinding energy for burning[J].Internal Journal of Advanced Manufacture Technology,2006,28(1-2):38-44 [4] Yu Yiqing.Material removal mechanisms in grinding aeronautical alloys,partⅠ:Experiments and results[J].Key Engineering Materials,2004,34(1):318–323 [5] 陈明,朱明武,浦学锋.GH4169磨削烧伤机理研究[J].南京理工大学学报, 1995,19(2):152-155 Chen Ming,Zhu Mingwu,Pu Xuefeng.A study of workpiece burn mechanism during grinding of superalloy[J].Journal of Nanjing University of Science and Technology,1995,19(2):152-155(in Chinese) [6] 陈明.难加工材料成形磨削烧伤研究[J].上海交通大学学报,1997,31(9):56-60 Chen Ming.Studies on profile grinding burn in the process of grinding difficult-to-machine materials[J].Journal of Shanghai Jiaotong University,1997,31(9):56-60(in Chinese) [7] 任敬心,康仁科,史兴宽. 难加工材料的磨削[M]. 北京:国防工业出版社, 1999:146-149 Ren Jingxin,Kang Renke,Shi Xingkuan.Grinding of difficult-to-cut materials[M].Beijing:Defence Industry Press,1999:146-149(in Chinese) -
点击查看大图
计量
- 文章访问数: 4039
- HTML全文浏览量: 224
- PDF下载量: 1474
- 被引次数: 0
下载:
