摘要
由於硬碟固定架在伺服機殼為重要之結構設計一環節，因伺服機殼與硬碟固定架及硬碟常做快速組裝故在過程中一併有滑動狀態問題，衍生裝配不容易，滑動不順暢甚而因摩擦導致鐵屑掉落情況發生。本文針對目前現有的固態式硬碟產品用修正式TRIZ的創新改善流程設計新的固態式硬碟固定架，主要為就伺服機殼之組裝、滑動進行創新結構改善，並在與固態式硬碟固定架與固態式硬碟裝配時的凸緣成型所用的模具進行改善，使所得之凸緣有較佳的成形結構。
原有的將伺服器機殼之固態式硬碟固定架的組裝作業方式是在與伺服器系統之雙邊間隔板與彈片結合作為開關固定，所以開啟伺服器系統上蓋後，使用者可以下壓彈片後往前推動固態式硬碟抽取盒作為脫離於伺服器底座之方法。為進一步改善其組裝的方便性，本文應用修正式TRIZ的發明創新法則，此次的主要改善重點在於將其內部固態式硬碟固定架分拆結構設計，待進入修正式TRIZ系統介面後，首先選擇欲改善的參數群組為「物質數量」之「23.物質之耗費」，由分析後所列出之建議發明法則順序，逐一思考可能解決的方向，本例選擇以「3.局部特性」發明法則為考慮方向，我們採用發明法則「3.局部特性」的「a.將一物體或外在環境（動作）由相同成分組成的結構轉變成由不同成分組成的結構」。選定發明法則以後，由系統顯示之不欲惡化群組順序依次考慮，考慮到組合時之拆卸便利性，所以選定「物體壽命」群組之「15.移動物體之耐久性」為本例不欲惡化參數。故建議可將動作一分為二，將滑動轉軸與板金料件兩者與固態式硬碟固定架外框做一結合，將這項動作變為當下壓板金時藉滑動轉軸旋轉之功能達到解鎖及往前推動之助力的創新結構。
此外一般伺服器機殼擺放固態式硬碟固定架在做滑動過程時，因板金與板金之間的摩擦常造成鐵屑的生成。故本研究用修正式TRIZ發明法則再進一步改善。此次的主要改善重點在於將內部固態式硬碟固定架當往外推出後須如何滑動才為順暢無阻礙。本文選擇以發明法則「3.局部特性」的「a.將一物體或外在環境（動作）由相同成分組成的結構轉變成由不同成分組成的結構」為改善方向，其建議可將其一部分材質做改變，因此本研究尋找兩款材質分別為PC與Silicone rubber，材質Silicone rubber表面粗度為3μ-18μ厚度為0.13mm；材質PC表面粗度為0.38μ厚度為0.13mm，作為滑動結合，又因PC表面粗度較小，故選PC會比Silicone rubber材質更能將這項動作變為更為滑順，且能避免鐵削產生後果。
最後固態式硬碟與固態式硬碟固定架在組裝過程中會有凸緣結構，因現有產品凸緣的引伸結構沒有壓料板設計，因此現有的凸緣其良率較低，且凸緣的底部的凸起邊緣有時會較大，導致固態式硬碟抽取有時會有不順，影響組裝方便性。故本研究另外設計新的凸緣成型引伸模具，以改善此問題。因此本文再應用修正式TRIZ的發明方法，本文選擇發明法則「9.預先之反作用」的「a.事先給予反張力補償物體上過度與不想要的應力」為考慮方向。選定發明法則以後，依此本文在引伸模具設計上加上壓料板，本文改用有壓料板的模具設計在CAD軟體先建構出一個模具引伸成型模具，在模具引伸凸緣的動作中，本文用Abaqus模擬軟體模擬無壓料板模具與有壓料板模具之引伸過程間的變化。經Abaqus模擬結果發現採用有壓料板的模具，與無壓料板的模具的引伸結果相比較，有壓料版的模具在引伸過程的下壓力較小，產生的凸緣在引伸底部側邊有較小的應力，引伸過程的凸緣壁厚較薄，且產生的凸緣底部的側邊有較小的凸起，因此可產生較佳的凸緣結構。

關鍵字： 有限元素分析、伺服系統、大變形理論、TRIZ理論

Abstract
Hard disk drive (HDD) tray is an important link to structural design of server chassis. Since server chassis always conducts fast assembly with HDD tray and hard drive, there is problem of sliding state in the process, thus deriving the circumstances of difficult assembly, unsmooth sliding, and even falling of iron filings due to friction. Focusing on the existing solid-state drive (SSD) product, the paper uses the innovative improvement procedure of modified TRIZ to design new SSD tray, mainly making innovative structural improvement of the assembly and sliding of server chassis. The paper also improves the die for flange forming during assembly of SSD tray and SSD in order to let the acquired flange have a better forming structure.
The original operation way of SSD tray assembly of server chassis is to combine bilateral partition of server system with shell fragment to serve as switch fixer. Therefore, after the upper cover of server system is opened, user can take the method of pressing down the shell fragment and pushing forward the SSD removable box to detach it from the server bottom case. In order to further improve the convenience of its assembly, the paper applies the innovative invention rules of modified TRIZ. The main focus of improvement this time is on structural design of dismantling of its internal SSD tray. After entering the interface of modified TRIZ system, the paper firstly selects “quantity of substances” under “23. Loss of substance” cluster as the parameter group to be improved.
After analysis, the suggested order of invention rules is listed out. We can think about the possible directions of solutions one by one. For the case of the paper, the invention rule “3. local quality” is selected as a consideration direction. We employ “a. provide transition from a homogeneous structure of an object or outside environment (outside action) to a heteroge neous structure.” under “3. local quality”. After invention rule is selected, the order of non-worsening goups appeared in the system is considered. As the convenience of dismantling during assembly is considered, “15. durability of moving object” under “life of object” is selected as a non-worsening parameter of this case.
Therefore, it is suggested that the movement is divided into two. Combine the rotating shaft for sliding and sheet metal material with the SSD frame, and change this movement to be an innovative structure that helps achieve unlocking and forward pushing through sliding and rotation functions of rotating shaft during downward pressing of sheet metal.
Besides, when general server chassis is placed with SSD tray for the sliding process, the friction between sheet metals would always generate iron filings. Therefore, the paper uses modified TRIZ invention rules to make further improvement. The main focus of improvement this time is to find out how to make sliding smooth and obstacle-free after the internal SSD removable box is pushed outward. The paper selects “a. provide transition from a homogeneous structure of an object or outside environment (outside action) to a heteroge neous structure.” under the invention rule “3. local quality” as the improvement direction.
It is suggested that a part of the material can be changed. Therefore, the paper finds out two materials: polycarbonate (PC) and silicone rubber. For silicone rubber, its surface roughness is 3μ-18μ and its thickness is 0.13mm; and for PC, its surface roughness is 0.38μ and its thickness is 0.13mm. They serve as a sliding combination. Since PC has a smaller surface roughness, PC is selected as it would give smoother sliding movement than the material of silicone rubber, and can avoid the outcome of generation of iron filings.
Finally, SSD and SSD tray would have flange structure in the assembly process. Since the extension structure of the existing product flange does not have the design of blank holder, the yield rate of the existing flange is lower, and the protruding edge at the bottom of flange is sometimes greater, thus leading to occasional unsmooth removal of SSD and affecting the convenience of assembly. In order to improve these problems, the paper additionally designs a new extension die for flange forming. Hence, the paper applies again the modified TRIZ invention method. The paper selects “a. if it is necessary to carry out some action, consider a counteraction in advance.” under the invention rule “9. Preliminary anti-action” as the consideration direction. After the invention rule is selected, based on this, the paper adds blank holder to the design of extension die. The paper changes to use the design of die with blank holder and firstly establishes in CAD software a die extension forming die.
In the movement of die extension flange, the paper uses Abaqus simulation software to simulate the change of extension process between the die without blank holder and the die with blank holder. As found in the results of simulation by Abaqus, comparing the extension results between the die with blank holder and the die without blank holder, in the extension process the die with blank holder gives a smaller downward force, and the flange produced has smaller stress at the lateral side at the bottom of extension. In the extension process, the flange wall thickness is thinner. At the lateral side at the bottom of the produced flange there is s smaller protruding edge, so that a better flange structure can be produced.

Keywords: finite element analysis, server system, large deformation theory, TRIZ theory

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