铁氧体磁轭零件精密磨削加工技术研究

论文编号:JX558  论文字数:22853,页数:40

摘    要

 本文对铁氧体陶瓷材料磨削表面粗糙度、显微硬度、微观缺陷等方面进行了试验研究，结合砂轮磨削速度、磨削深度、工件速度等磨削工艺参数的单因素试验和正交试验，分析了不同磨削参数对表面粗糙度、显微硬度、微观缺陷等的影响规律，优化了工艺参数，为铁氧体零件磨削加工参数的确定提供了依据,并通过电镜观察磨削表面形貌，结合铁氧体的磨削去除机理进行了分析。主要结论有：
 1）铁氧体磨削表面粗糙度值Ra大体上随砂轮磨削速度vs的增加而变小，随工件速度vw及磨削深度ap的增大而增大；由平面磨削正交试验可以看出，平面磨削中砂轮磨削速度vs和工件速度vw对工件表面粗糙度影响较大，磨削深度ap对其影响较小。
 2）磨削工艺参数的改变对铁氧体表面显微硬度的影响并不显著，铁氧体磨削后显微硬度受磨削温度的影响较大，受磨削力的影响较小；在较低的砂轮磨削速度、较高的工件速度和磨削深度下，工件的显微硬度稍高。
 3）铁氧体磨削表面主要由连续或不连续的切削痕迹，脆性断裂形成的凹坑以及塑性变形区构成；在较小工件速度vw和磨削深度ap以及较大砂轮磨削速度vs下，材料容易以塑性变形方式去除，从而可获得好的表面质量。
 4）铁氧体零件磨削加工中还容易出现裂纹、崩边等现象，主要由于材料的高硬脆性和磨削力过大所致，通过合理选择磨削参数和修整砂轮可以尽量避免。
 
关键词：铁氧体；表面粗糙度；参数优化；显微硬度；微观缺陷

Technique of Precision Grinding on Ferrite Yoke Parts
ABSTRACT

 In this thesis , the surface roughness, hardness, micro-defects of ferrite ceramic materials were studied, combined with grinding parameters such as wheel speed, grinding depth and workpiece speed and make use of the single factor and orthogonal tests of the different grinding parameters on the laws of surface roughness, hardness, micro-defects and so on. The process parameters were optimized to reduce the grinding surface roughness, for the basis of ferrite components grinding, grinding surface morphology of the ferrite was observation by electron microscopy and analyse the materials removal mechanism of grinding.
 1）Ferrite grinding surface roughness Ra was smaller when the wheel grinding speed vs increase, and largen with the workpiece speed vw or grinding depth ap was increased, By the orthogonal tests can be seen that surface grinding in the grinding wheel speed vs and workpiece speed vw have greater impact on the surface roughness,but grinding depth ap was little.
 2）Grinding process parameters effect on ferrite surface hardness is not significant, the hardness after grinding is greatly influenced by the grinding temperature, less affected by the grinding force. The higher hardness of the workpiece when the low wheel speed, higher workpiece speed and grinding depth.
 3）Ferrite grinding surface mainly formed by the continuous or discontinuous cutting streak, brittle fracture and plastic deformation zone. In the smaller workpiece speed vw , grinding depth ap and larger wheel speed vs , the material was easy to remove by plastic deformation and obtain better surface quality.
 4）The grinding of ferrite components, it is also prone to cracking, chipping phenomena, mainly due to the high material  hard and brittle and excessive force, choosing reasonable parameters and grinding wheel dressing can be avoided.
 
Key words：ferrite; surface roughness; parameter optimization; Microhardness; Microdefects
 

目    录

摘要 I
ABSTRACT II
第1章  绪论 1
 1.1课题来源 1
 1.2课题的研究目的和意义 1
 1.3工程陶瓷材料国内外研究状况及发展趋势 1
 1.3.1工程陶瓷材料加工的研究概况 1
 1.3.2铁氧体陶瓷材料加工的研究现状 6
 1.4研究内容及研究方案 7
 1.4.1研究内容 7
 1.4.2研究方案 7
第2章  铁氧体陶瓷材料磨削表面粗糙度试验研究 10
 2.1铁氧体陶瓷的磨削特点 10
 2.2铁氧体陶瓷磨削表面粗糙度单因素试验 10
 2.2.1试验设计及试验条件 11
 2.2.2磨削速度单因素试验 11
 2.2.3工件速度单因素试验 12
 2.2.4磨削深度单因素试验 13
 2.2.5其它磨削参数的影响 13
 2.3铁氧体陶瓷磨削表面粗糙度正交试验 15
 2.3.1正交试验设计 15
 2.3.2正交试验数据及其分析 15
 2.4本章小结 18
第3章  铁氧体陶瓷材料磨削显微硬度研究 19
 3.1材料显微硬度 19
 3.2显微硬度研究内容 19
 3.2.1试验条件 19
 3.2.2试验数据及其分析 20
 3.3本章小结 22
第4章  铁氧体磨削机理及表面形貌观察分析 23
 4.1铁氧体磨削机理 23
 4.2铁氧体磨削表面形貌观察 25
 4.2.1磨削前后材料微观缺陷的观察 25
 4.2.2磨削速度对磨削表面微观缺陷的影响 26
 4.2.3工件速度对磨削表面微观缺陷的影响 27
 4.2.4磨削深度对磨削表面微观缺陷的影响 27
 4.2.5崩边现象分析 28
 4.3本章小结 29
第5章  论文总结与存在问题 30
 5.1论文总结 30
 5.2存在问题 30
参考文献 31
谢辞 33
附录 34