鐵氧體磁軛零件精密磨削加工技術(shù)研究

機(jī)械論文編號(hào):JX558  論文字?jǐn)?shù):22853,頁(yè)數(shù):40 

目    錄

摘要 I
ABSTRACT II
第1章  緒論 1
 1.1課題來(lái)源 1
 1.2課題的研究目的和意義 1
 1.3工程陶瓷材料國(guó)內(nèi)外研究狀況及發(fā)展趨勢(shì) 1
 1.3.1工程陶瓷材料加工的研究概況 1
 1.3.2鐵氧體陶瓷材料加工的研究現(xiàn)狀 6
 1.4研究?jī)?nèi)容及研究方案 7
 1.4.1研究?jī)?nèi)容 7
 1.4.2研究方案 7
第2章  鐵氧體陶瓷材料磨削表面粗糙度試驗(yàn)研究 10
 2.1鐵氧體陶瓷的磨削特點(diǎn) 10
 2.2鐵氧體陶瓷磨削表面粗糙度單因素試驗(yàn) 10
 2.2.1試驗(yàn)設(shè)計(jì)及試驗(yàn)條件 11
 2.2.2磨削速度單因素試驗(yàn) 11
 2.2.3工件速度單因素試驗(yàn) 12
 2.2.4磨削深度單因素試驗(yàn) 13
 2.2.5其它磨削參數(shù)的影響 13
 2.3鐵氧體陶瓷磨削表面粗糙度正交試驗(yàn) 15
 2.3.1正交試驗(yàn)設(shè)計(jì) 15
 2.3.2正交試驗(yàn)數(shù)據(jù)及其分析 15
 2.4本章小結(jié) 18
第3章  鐵氧體陶瓷材料磨削顯微硬度研究 19
 3.1材料顯微硬度 19
 3.2顯微硬度研究?jī)?nèi)容 19
 3.2.1試驗(yàn)條件 19
 3.2.2試驗(yàn)數(shù)據(jù)及其分析 20
 3.3本章小結(jié) 22
第4章  鐵氧體磨削機(jī)理及表面形貌觀察分析 23
 4.1鐵氧體磨削機(jī)理 23
 4.2鐵氧體磨削表面形貌觀察 25
 4.2.1磨削前后材料微觀缺陷的觀察 25
 4.2.2磨削速度對(duì)磨削表面微觀缺陷的影響 26
 4.2.3工件速度對(duì)磨削表面微觀缺陷的影響 27
 4.2.4磨削深度對(duì)磨削表面微觀缺陷的影響 27
 4.2.5崩邊現(xiàn)象分析 28
 4.3本章小結(jié) 29
第5章  論文總結(jié)與存在問(wèn)題 30
 5.1論文總結(jié) 30
 5.2存在問(wèn)題 30
參考文獻(xiàn) 31
謝辭 33
附錄 34

摘    要

摘    要

 本文對(duì)鐵氧體陶瓷材料磨削表面粗糙度、顯微硬度、微觀缺陷等方面進(jìn)行了試驗(yàn)研究，結(jié)合砂輪磨削速度、磨削深度、工件速度等磨削工藝參數(shù)的單因素試驗(yàn)和正交試驗(yàn)，分析了不同磨削參數(shù)對(duì)表面粗糙度、顯微硬度、微觀缺陷等的影響規(guī)律，優(yōu)化了工藝參數(shù)，為鐵氧體零件磨削加工參數(shù)的確定提供了依據(jù),并通過(guò)電鏡觀察磨削表面形貌，結(jié)合鐵氧體的磨削去除機(jī)理進(jìn)行了分析。主要結(jié)論有：
 1）鐵氧體磨削表面粗糙度值Ra大體上隨砂輪磨削速度vs的增加而變小，隨工件速度vw及磨削深度ap的增大而增大；由平面磨削正交試驗(yàn)可以看出，平面磨削中砂輪磨削速度vs和工件速度vw對(duì)工件表面粗糙度影響較大，磨削深度ap對(duì)其影響較小。
 2）磨削工藝參數(shù)的改變對(duì)鐵氧體表面顯微硬度的影響并不顯著，鐵氧體磨削后顯微硬度受磨削溫度的影響較大，受磨削力的影響較小；在較低的砂輪磨削速度、較高的工件速度和磨削深度下，工件的顯微硬度稍高。
 3）鐵氧體磨削表面主要由連續(xù)或不連續(xù)的切削痕跡，脆性斷裂形成的凹坑以及塑性變形區(qū)構(gòu)成；在較小工件速度vw和磨削深度ap以及較大砂輪磨削速度vs下，材料容易以塑性變形方式去除，從而可獲得好的表面質(zhì)量。
 4）鐵氧體零件磨削加工中還容易出現(xiàn)裂紋、崩邊等現(xiàn)象，主要由于材料的高硬脆性和磨削力過(guò)大所致，通過(guò)合理選擇磨削參數(shù)和修整砂輪可以盡量避免。
 
關(guān)鍵詞：鐵氧體；表面粗糙度；參數(shù)優(yōu)化；顯微硬度；微觀缺陷

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