板金看起來跟實際剛性差別 - 開車
By Adele
at 2022-03-15T11:40
at 2022-03-15T11:40
Table of Contents
※ 引述《nbarepeat (nbarepeat)》之銘言:
: 開車大家都注重剛性吧
: 像路上福特跟雙b板金看起來就很厚實
: Vios 神a跟fabia 板金看起來好像蠻薄的
: 這種板金看起來跟實際測試的剛性會差很多嗎
: -----
: Sent from JPTT on my iPhone
[無法看出厚度]
厚度資訊來源
1. 從設計端(BOM表)直接知道該鈑件厚度資訊
2. 依據"外鈑件"來判斷大致厚度(1 mm以下)
3. 磨掉漆層、防鏽層露出金屬量測
外門鈑件厚度約0.7 mm,鋁合金會稍厚(約1 mm)
https://i.imgur.com/Mt0Na1O.jpg
Lightweight Design in the Door Outer Panel
冷軋強度約300 MPa,厚度0.6-0.9 mm,應用在外鈑件(引擎蓋、門、天花板)
https://i.imgur.com/rXldSPr.jpg
Modern materials for automotive industry
DOI: 10.21272/jes.2017.4(2).f8
基本上這類蒙皮大致在0.7mm,烤漆上去會再多個0.Xmm
[外鈑件(蒙皮)的厚度資訊沒意義]
鈑件NVH的解決方案有制振墊或加強肋
關門紮實感可以從絞鍊、六角鎖、密封膠條下手
增加厚度是超級沒效率的做法.....
普遍認為國產車鈑金輕薄,那也只是因為平價車少了制振墊或加強肋
絕非豪華車的鈑金做比較厚
前面第一張圖有外鈑件重量資訊
假設加厚一倍,光4個車門就重了20公斤,算上引擎蓋、天花板整車多50~80公斤
車廠開發團隊又不是傻了.....
鈑金蒙皮剛性是一回事,車體結構剛性又是另一回事
車體結構剛性可以參考 ULSAB(UltraLight Steel Auto Body) Programme
https://i.imgur.com/wpUWJpf.jpg
https://i.imgur.com/YOLmMkY.jpg
(1) 不含前後懸吊
(2) 懸吊上座4點支撐
(3) 12根桿子與24個量測位移的電子元件
https://i.imgur.com/2r67BHp.jpg
(4)前後擋風玻璃由同厚度的鋁代替(因為玻璃和鋁的模數相近)
1. Static Torsion
https://i.imgur.com/BjEMMOY.jpg
負載從1000 Nm到4000 Nm
變形量是deg(角度)
Torsion單位為 Nm/deg
2. Static Bending
https://i.imgur.com/JrIBFsB.jpg
負載從1000 N到4000 N (平均分配到四個panel)
變形量是mm
Bending單位為 N/mm
車體剛性算是拿來比較同型車的一個簡單的參考指標
1. 先天:轎車 > 休旅車 >>>> 敞篷車
2. 扭轉剛性跟車體結構(被動)安全無關
3. 影響動態(暫態)性能(需同時考慮車體+懸吊)、NVH平順性、乘適性
車體結構剛性也是達一定的值就夠
不是越高越好
車廠普遍作法是針對TB(trimmed body)做局部剛性調整(增加或減少都有可能)
並非單純提高整體結構的剛性
--
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