电梯导轨需要高精度的矫直。
套管生产中，矫直工序决定了套管的形状精度和残余应力，对套管抗挤强度有很大影响。
In casing production straightening determines the shape precision and residual stress in casing, which have strong influence on the collapse resistance of casing.
平行多辊矫直机是材料平整工业中十分重要的设备，但高精度液压位置伺服控制矫直机国内还很少。
Parallel multi-roller straightener is an important equipment in the materials straightening industry. But high-precision straightener with hydraulic position servo-control can hardly be made in China.
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