本文選題：磁頭磁盤　切入點：窩點與撓臂　出處：《華南理工大學(xué)》2014年博士論文

【摘要】：信息技術(shù)的不斷發(fā)展對信息存儲容量及存儲安全性能的要求越來越高。超高密度存儲硬盤的出現(xiàn)，使得磁頭越來越貼近磁盤盤面，目前使用的硬盤中磁頭與磁盤之間的飛行高度僅為幾個納米左右。硬盤正常工作時磁頭的加載、卸載、動態(tài)飛行及尋址等動作會引起窩點與撓臂發(fā)生微小相對位移，導(dǎo)致窩點與撓臂的微動磨損，破壞窩點與撓臂間的接觸面，影響磁頭浮塊的動態(tài)飛行能力。窩點與撓臂之間的微動磨損還會產(chǎn)生磨削顆粒，這些顆粒散落在硬盤里，容易卷入磁頭與磁盤之間的微小間隙引起接觸碰撞，損壞磁頭組件與盤面，造成永久的數(shù)據(jù)丟失。硬盤在受到外界激振力作用時，更容易引起磁頭磁盤的劇烈碰撞，從而加劇窩點與撓臂之間的微動磨損。特別是當(dāng)硬盤處于充氦環(huán)境中時，稀薄的氦氣在磁頭受到撓動時能提供的阻尼作用有限，相同的激振力作用下，磁頭磁盤的接觸碰撞力遠遠大于處于空氣環(huán)境中的硬盤。 目前針對磁頭磁盤接觸碰撞過程中引起的窩點與撓臂之間的微動磨損研究很少。結(jié)合懸架有限元模型、浮塊與盤面間的動態(tài)氣浮軸承模型以及磁頭磁盤接觸碰撞模型，研究了當(dāng)磁頭與磁盤發(fā)生接觸碰撞時引起的窩點與撓臂之間的動態(tài)接觸力變化，研究了材料屬性對窩點與撓臂動態(tài)接觸力的影響，模擬了硬盤工作狀態(tài)下受外界干擾時磁頭的動態(tài)響應(yīng)，模擬了較為真實工作狀態(tài)下窩點與撓臂的動態(tài)接觸力，為窩點與撓臂間微動磨損數(shù)值模擬奠定了基礎(chǔ)。 在目前較為新興的充氦硬盤技術(shù)中，提出了使用氦-空混合氣體來代替純氦的方法。研究了氦-空混合氣體的物理性質(zhì)，結(jié)合動態(tài)氣浮軸承模型以及粗糙磁頭磁盤接觸碰撞模型研究了在不同氦氣比例下，磁頭的動態(tài)飛行性能和磁頭與磁盤接觸碰撞性能。該模擬計算中使用了較新的氣浮面設(shè)計，通過有限單元法求解了復(fù)雜氣浮面上各節(jié)點的飛行高度和氣浮壓強。研究了磁盤速度對50%充氦環(huán)境中磁頭與磁盤接觸碰撞的影響。研究發(fā)現(xiàn)，氦-空混合氣體代替純氦在沖擊載荷下能提供較好的阻尼作用，減少磁頭與磁盤間劇烈的接觸碰撞。 建立了適用于微納米量級幅值運動的微動磨損實驗平臺，通過實驗方法研究了窩點與撓臂在不同載荷下的微動磨損行為，比較了激光拋光工藝對窩點微動磨損性能的影響。通過力傳感器和激光測振儀采集數(shù)據(jù)與處理，獲得了摩擦力-位移微動圖和摩擦系數(shù)隨著微動循環(huán)次數(shù)增加而演變的結(jié)果；通過掃描電鏡的測量，，計算并比較了拋光與非拋光窩點磨損體積。研究表明，載荷會引起微動磨損區(qū)域轉(zhuǎn)變而導(dǎo)致不同的表面損傷機理；表面粗糙度在較小載荷時對磨損體積的影響可忽略不計，但在較大載荷和較長時間的微動磨損中，激光拋光窩點可以顯著減小磨損體積；計算了窩點動態(tài)微動磨損系數(shù)，為后續(xù)的微動磨損模擬奠定了研究基礎(chǔ)。 建立了窩點與撓臂的二維微動磨損模型，應(yīng)用了實驗中獲得的摩擦系數(shù)及動態(tài)磨損系數(shù)。采用了改進的Archard磨損方程遞進地計算了窩點與撓臂的局部磨損深度，研究并確定了最優(yōu)的微動循環(huán)增量步，極大的減少了模型計算時間。運用該模型預(yù)測了不同載荷和微動循環(huán)次數(shù)下窩點與撓臂的磨痕形貌、接觸壓強及應(yīng)力分布等。通過跟實驗結(jié)果比較，表明該二維模型預(yù)測趨勢跟實驗結(jié)果一致但是誤差較大，因模型計算較快可以用來定性研究幾何尺寸和材料屬性對窩點與撓臂微動磨損性能的影響。 在二維微動模型基礎(chǔ)上，建立了窩點與撓臂的三維微動磨損模型。推導(dǎo)了適應(yīng)于不同微動位移的局部磨損公式，提出了自適應(yīng)動態(tài)微動循環(huán)增量步方法，使以往耗時較長的三維微動磨損模擬在普通計算機上得以實現(xiàn)。通過跟實驗結(jié)果對比，表明三維模型能更準(zhǔn)確地預(yù)測窩點與撓臂的微動磨損表面形貌，誤差為8.5%。因此，窩點與撓臂的三維微動磨損模型可為懸架窩點與撓臂的研究設(shè)計工作提供重要的理論指導(dǎo)。
[Abstract]:The development of information technology on the safety of information storage and storage capacity of the increasingly high demand. The ultra high density storage disk, the disk head closer to the surface, the hard disk between the head and the flying height of only a few nanometers. The hard disk magnetic head loading, normal work unloading, dynamic such action will cause flight and addressing dens and the flexure of micro displacement, resulting in fretting wear and flexure failure dens, dens and contact surface of flexible arm between the dynamic flight capacity magnetic floating block. Between the dimple and the flexure of the fretting wear produces grinding particles, these particles scattered in the hard disk, easy to get caught up in the small gap between the head and the disk caused by collision, damage the head assembly with the disk, causing permanent loss of data. The hard disk under the outside force, more capacity Easy to cause the violent collision of the head disk, thereby increasing the fretting wear between the dimple and the flexure. Especially when the hard disk is in helium environment, thin helium at the head by damping deflection can provide is limited, the exciting force under the same head disk collision force is far greater than in touch with the air environment in the hard disk.
The head disk contact between the dimple and the flexure caused by collision in the process of fretting wear seldom investigated. Combined with the suspension of finite element model, dynamic model and floating air bearing block between the disk and the head disk contact model of dynamic contact force between the slider and disk dens caused when contact happened during collision and torsion arm changes, to study the influence of material properties on the dynamic contact force of the flexible arm and dens, simulating dynamic hard working state interference when head response, simulation of dynamic contact force of dimple and flexible arm more real working conditions, laid the foundation for the dimple and the flexure between fretting wear numerical simulation.
In the helium filled hard disk technology is emerging, proposed to replace the pure helium helium - air mixed gas. The physical properties of helium - air mixed gas, combined with the dynamic air bearing model and rough head disk were investigated at different ratios of helium collision model, dynamic flight performance and magnetic head and disk contact the head performance. The simulation calculation is used in the design of new gas floatation, through the finite element method for solving the complex gas on the surface of each node and air pressure altitude. The effects of magnetic head and disk speed disk 50% helium filled environment contact. The study found that helium - air mixed gas instead of pure helium can provide better damping effect under impact load, reduce the head and disk between violent collision.
The fretting wear experiment platform is built for the micro nano motion amplitude, the fretting wear behavior of dimple and flexure under different loads is studied through the experimental method, the influence of laser polishing process on the fretting wear behavior of dens were compared. By means of force sensor and laser vibration measurement instrument data acquisition and processing, the friction force and displacement fretting maps and friction coefficient changes along with the results of fretting cycles; measured by scanning electron microscope, calculated and compared with the non polishing polishing dens wear volume. The results show that the load will cause the loss of area change caused the fretting wear damage mechanism of different surface; surface roughness in a low load effect on wear volume can be ignored, but in fretting wear large load and long time, laser polishing can significantly reduce the wear volume of dens dens; dynamic calculation The fretting wear coefficient has laid a foundation for the subsequent simulation of fretting wear.
A two-dimensional model for the fretting wear of dimple and flexible arm, application of the obtained dynamic friction coefficient and wear coefficient. The improved Archard equation to calculate the progressive wear depth of dimple and local wear of flexible arm, we determine the optimal cycle of micro increment, greatly reducing the calculation time. Using the model to predict the wear surface of different dimple and the flexure load and fretting cycles, contact pressure and stress distribution. By comparison with the experimental results, show that the two-dimensional model prediction with experimental results but the error is large, because the model can be used to study the rapid qualitative geometric dimensions and material properties of dimple and the flexure fretting wear properties of impact.
Based on a two-dimensional model, a three-dimensional model for the fretting wear of dimple and flexible arm. The local wear formula adapted to different displacement, the proposed adaptive dynamic micro circulation increment method, the time-consuming 3D fretting wear simulation in general computer implemented. By comparing with the experimental results. Show that the fretting wear surface morphology of the 3D model can more accurately predict the dens and flexible arm, so the error is 8.5%., dimple and the flexure 3D fretting wear model can provide an important theoretical guidance for the research and design work of suspension dimple and the flexure.

【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TH117.1

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