求翻译：摘要：在铝合金阶段变截面八字形型材生产过程中，制品的侧臂间隙、爪板间隙和扩、并口尺寸，严重影响着整个型材的外形尺寸。在辊式矫直方法中，通过分析影响制品外形尺寸之间相互变化的规律，选择合理的配辊矫直方法，消除制品不同的铝合金阶段变截面型材辊式矫直方法是什么意思？

Abstract: In the variable cross-section eight-shaped profiles of aluminum alloy stage production process, the clearance of the products side of the arm, claw plate gap and expansion, parallel dimensions, seriously affect the form factor of the whole profile. Roller straightening method, through the