Cold Roll Forming Process and Die Design for Double-Gutter Frame of Drawer Slider

Jinn Jong Sheu, Chia Cheng Hsieh,Cheng Hsien Yu (2015) Cold Roll Forming Process and Die Design for Double-Gutter Frame of Drawer Slider, Key Engineering Materials, Vol.626,

Abstract

In this paper, the main focus is to demonstrate a systematic method of designing the roll flower and corresponding dies for a double-gutter frame applied to the drawer slider. The blank development method was proposed to calculate the width of blank for bending with small radii. The cold roll forming process design was based on the maximum longitudinal strain minimization and the interference of rolls with the double-gutter geometry of product profile. Extra pre-bending was designed to avoid the occurrence of blank collision during forming process. The FEM method was adopted to evaluate the process and die designs. Due to the geometry complexity of the product, strain distribution is uneven which results in more spring back and stress concentration. A geometry setting design was proposed to create local strain redistribution and smooth strain distribution of entire section profile after final forming step. Using geometry setting die design, the spring back at the end point and the gutter areas of final product section are 0.07 mm and 0.1 mm, respectively. Without the geometry setting die design, the spring back at the end point and the gutter areas of final product section are 0.11 mm and 0.15 mm, respectively. The simulation results demonstrate the proposed methods are able to improve the accuracy of cold roll forming products.

Keywords : Cold Roll Forming Die Design;Double-Gutter Frame of Slider;Roll Flower Design;Sprig Back Control

http://www.scientific.net/AMM.419.395

Cold Forging Die Design and Process Simulation of a Disk with Inner Ring Gear

Cheng Hsien Yu,Jinn Jong Sheu (2015) Cold Forging Die Design and Process Simulation of a Disk with Inner Ring Gear, Key Engineering Materials, Vol.626, pp.211-216.

Abstract

Cold forging die design and process simulation were studied in this paper for a disk with center boss and outer ring gear. The complexity of part geometry results in defects of under-filling and folding. The material flow interference in the radial and the axial directions at the corner areas is the main reason of the occurrence of defects. A multi-stage cold forging process was proposed to control the material flow and volume distribution simultaneously. FEM simulations were carried out to evaluate the designs of process and die. The proposed preform and web geometry designs were able to decrease the forging load and control the material flow. The simulation results showed the proposed methods were able to make this forged part without defects.

Keywords : CAE;Cold Forging;Multi-Stage Forging;Preforming Design;Ring Gear

http://www.scientific.net/AMM.419.395

Preform and Die Designs for Hot Forging Process of Linear Slide Block

Cheng Hsien Yu,Jinn Jong Sheu (2013) Preform and Die Designs for Hot Forging Process of Linear Slide Block, Applied Mechanics and Materials, Vol.419, pp.395-400.

Abstract

In this study, the preform and die designs of hot forging process were proposed for a long-flat slide block. This block is assembled to the linear slide for carrying the moving table. Three different billet geometry designs were proposed to obtain good die filling. The volume of the flash is limited to 30% with a flash thickness design in 3 mm. The forging die was designed with four ejectors to push up the forged part smoothly. The proposed billet geometries and die design were evaluated using CAE simulation. The simulation results indicated that the suitable perform design is able to achieve better material flow. The flash flow control is able to reduce the forming load and improve the die filling. The forging experiments were carried out to verify the proposed method, the experiment results showed good agreement with the CAE simulations.

Keywords: Forging Die Design;Hot Forging;Linear Slide Block;Preforming Design

http://www.scientific.net/AMM.419.395

20141001-線上取出PDF內嵌圖片工具 (ExtractPDF)

20141001-線上取出PDF內嵌圖片工具 (ExtractPDF)

取出 PDF 內圖片的線上工具：http://www.extractpdf.com/

操作方法：

（1）上傳PDF

（2）網站取出圖片

（3）點擊圖片下載
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Enson.

20140927-三種筆記方式、工具及方法

20140927-三種筆記方式、工具及方法

看雜誌介紹的三種筆記（創意、心靈、工作）方式，
整理在一起和大家分享。

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Enson.

20140621-帝國崛起 (Rise of an Empire) 觀後感

20140621-帝國崛起 (Rise of an Empire) 觀後感

帝國崛起（Rise of an Empire）這部片，
雅典軍夥同斯巴達人力抗波斯大軍，打海戰也打野戰 ... 

基本上，就是希臘版的赤壁之戰，孔明借東風火燒連環船，
希臘人攔水作壩，霧鎖愛琴海，波斯大將慘被悶著打... 

肌肉棒子的視覺衝擊不如 300壯士，肢體破碎的噁心程度倒是有過之而無不及 ... 

嗯，看過就算了。
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Enson.

20140608-明日邊界 (Edge of Tomorrow)-觀後感

20140608-明日邊界 (Edge of Tomorrow)-觀後感

阿湯哥《明日邊界》這部片，前半段是喜劇片，弱雞政戰軍官阿湯哥～莫名其妙被派到前線搶灘頭，卻誤打誤撞得到無敵外掛！沒命了，就 reset 重開機，同樣的劇本再來一次。

中段，則是選擇其他的路線發展、嘗試新路線，以戰養戰累積經驗。

後半段根本是打怪、打魔王的攻略法，靠著reset-repeat、reset-repeat、reset-repeat，累積經驗打通關，最後，剩下本命一條，同歸於盡幹掉大魔王，再來個大樂透，失序的世界重回常規、平凡的人們繼續過著既定的生活 ... ...

這部片，不錯看，good。

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Enson.

20140406-輪轂近淨形鍛造 CAE 分析

20140406-輪轂近淨形鍛造 CAE 分析

這篇文章是看了一篇專利資料（US8256260）所做的 CAE 案例分析。在這篇專利中，主要的技術在於漸進式成形（incremental forming），近年來，漸進式成形的研究越來越多，舉凡擺輾鍛造（orbital forging）、旋壓成形（spinning）、都屬於漸進式成形，其主要特色是，胚料以局部成形，模具與胚料接觸面積少，成形力較單一沖頭單一道次成形低，模具壽命亦較高不易發生破壞。

該專利之漸進式成形方法可以參考下圖1的專利說明圖，上模分成5個沖頭（No. 18、20、16、22、24、26）依序向胚料（No.6）加壓變形。在 CAE 分析設定中，依序設定好各個沖頭的運動曲線（motion curve），以時間 vs 速度 （time - velocity）定義之，即可呈現出時序運動之效果，沖頭時序運動及胚料運動如圖2所示，動畫如圖3、胚料變形如圖4所示。

圖1、US8256260 專利說明圖

圖2、CAE 變形示意圖

圖3、輪轂漸進式成形動畫 [ http://youtu.be/BKnOqsBXZDA ]

圖4、輪轂漸進式成形胚料變形動畫 [ http://youtu.be/83rWxOWB6Zg ]

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Reference :

[1] Manu Mathai, Raymond Stonitsch, Guven Yucesan (2011) Near net shape forging process for compressor and turbine wheels and turbine spacer wheels, General Electric Company, US8256260.

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Enson.

20140329-五個關於快速且有效率寫作的秘訣

20140329-五個關於快速且有效率寫作的秘訣

原文標題：5 Tips for Writing Quickly and Effectively
原文出處：WORKAWESOME.com (http://goo.gl/4nwwPA)

無論寫作是不是你的習慣或是你的工作，最叫人感到沮喪的莫過於，日復一日，寫作的進度卻完全沒有趕上預定的進度。有效率且快速寫作的方法在於，訓練你的腦袋利用不同的思考模式來進行寫作任務。首先，丟掉擔心寫不出來的恐懼和挫折感，並試試以下這些步驟：

一、著手寫出第一份不需修正的草稿！

不論是寫小說還是寫技術文件，第一份草稿總是難以下筆。

你可能有許多的想法想表達，但是你並不確定如何下筆將這些想法寫下來，解決的方法就是你要告訴你自己，第一份草稿僅僅用來記錄你的想法、建構你的觀念，就算是充滿錯誤也是無妨，而從第二份草稿起，才開始一步步地修正錯誤，而讀者，根本沒機會看到充滿錯誤的草稿，因為他們看到的都是修正過後才會被刊登出來的文件。

二、要有計畫

在開始寫作前先做好寫作的清單。

藉由記錄你的想法，就算只有關鍵字，仍要盡量描繪出你想寫下的文章架構，當你開始不知道改寫寫什麼的時候，或開始困擾時，這份清單會有助於快速地將你拉回文件中。

三、分章節寫

如果你寫的是一份大的文件，就該分章節來寫，精神不容易疲累，能聚精會神地完成每一章節，也就能快速地完成寫作。

四、在適當的時間休息

教人有效率寫作的方法，總有一個沒說的秘密：適當的休息。

適度地離開書桌休息片刻，由於是有意識地離開，回來時你會知道你從什麼地方開始寫，相對地，如果你是因為生病或是其他突發狀況而停止寫作，當你再次回到書桌時，你得多花時間去想，你寫到哪裡了，接著要寫哪些東西，這就容易造成拖稿，而拖稿，就是快速有效率寫作的主要敵人！

五、隨身帶本筆記本

你無法預測你什麼時候會出現開創性的想法。

我們的腦袋常常因為某些問題而卡住、無法思考，這就是為什麼，當問題出現時，我們常常需要跳脫這問題，才能想出具開創性的解決辦法。當這些方法出現時，你如果沒立即記下這些想法，你有可能會忘了這些想法。因此，培養隨手記筆記的習慣就很重要，隨時寫下你的想法，除了用來解決當下的問題，在未來，或許也有機會用到，對於寫作，這些資料都有助於快速完成寫作的任務。
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Enson.

20140221-Paper 論文架構

20140221-Paper 論文架構

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Enson.