汽車工業中，汽車天窗為其中一個不可缺少的零組件。近年SUV車種日益增加，天窗的需求量跟著增加，而公司之營收很大一部分來自於天窗，在台灣的產線超過一半是為了生產天窗。在天窗製程中的其中一道製程-壓合壓U，首先會經過高週波壓合將包邊邊條與布簾確實熔接，再經過電熱壓U將兩邊之布邊成型為U型捲收軌道。而本文改善之製程便是將壓合壓U簡化為高週波壓U，此新製程在試驗階段其品質特性值未達到理想值，本文以田口方法做實驗，用以改善高週波壓U製程，並藉此找出影響品質特性值之顯著因子。

本文用L18(2^1×3^7)直交表做實驗，以此找出影響壓U高度品質特性之顯著因子為電流值、上模溫度與檔板位置;找出包邊邊條與布簾結合強度之品質特性顯著因子為電流值、壓力、上、下模溫度。經改善後的參數，預測壓U高度由1.37mm提升至1.46mm、結合強度由4.67N提升至8.84N，提升89%。由確認實驗壓U高度由1.36mm提升至1.44mm，壓U高度之C_pk由0.69提升至2.50。改善後參數對製程有很大的提升，改善壓U高度與邊條與布簾結合強度偏下限之現象。

In fabricating the automotive sunroof sunshade, high-frequency pressure flat welding is used to combine sunroof curtains and edging fabrics together for the purpose of making the rolling rails of sunshades. First, the sunroof curtain and the edging fabric are welded by a high-frequency pressure flat welding process, and then the U-shaped rail is formed on both sides of the curtain through a heat pressure U process. To lower the costs, a new mold is made to combine the high-frequency pressure flat welding and the heat pressure U process into the high-frequency pressure U process. That is, a U-shaped rail is formed during high-frequency welding. Because of this mold is new, the product characteristic values are all below the lower limit during the testing process. Therefore, the Taguchi method is used to find out the optimum parameters of the mold and the significant factors affecting the characteristics. An L18 orthogonal array is used to find the significant factors that affect the quality characteristics.
Experimental results show that the significant factors that affect the pressure U height are the current, the upper mold temperature, and the position of the baffle plate; the significant factors of the bonding strength of the edging fabric and the sunroof curtain are current, pressure, upper and lower mold temperature. After using the improved parameters, the predicted pressure U height increased from 1.37mm to 1.46mm, and the bonding strength increased from 4.67N to 8.84N. From the confirmation experiment, the height of the pressure U increases from 1.36mm to 1.44mm and the bonding strength satisfies the specification.

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