Straightening can improve the residual stress distribution in the cutting process of punching C-section steel and the zero cutting of formwork. When the stress distribution of the steel plate section is uneven, roll bending measures can be taken to add deformation to compensate for the uneven longitudinal fiber length, and then eliminate it. Wavy bending makes the internal stress of punched C-section steel uniform. The adjustment of horizontal crown value of straightener is also an important measure to improve the residual stress distribution of C-section steel.

光纤激光切开机的切开速度能够恰当提高切开质量，即切开稍窄，切开面润滑，减少变形。切开速度过快，因而切开线能量小于要求值，冲孔C型钢切开缝处的射流无法吹散熔化的切开熔体，构成很多后续阻力，随同切开C -铸钢加工断渣时，切开面质量下降。当速度高时，甚至因为切开太宽而导致圆弧平息，可见杰出的切开质量与切开速度是分不开的。

The cutting speed of fiber laser cutting machine can properly improve the cutting quality, that is, the cutting is slightly narrow, the cutting surface is lubricated and the deformation is reduced. The cutting speed is too fast, so the cutting line energy is less than the required value. The jet at the cutting seam of punching C-section steel can not blow away the molten cutting melt, forming a lot of subsequent resistance. When cutting C - cast steel, the quality of the cutting surface decreases. When the speed is high, even the arc subsides because the cutting is too wide. It can be seen that the excellent cutting quality is inseparable from the cutting speed.

切开速度过低时，由于切开部位是等离子弧的太阳，为了坚持电弧本身的稳定性，太阳散斑或太阳区有必要找到离狭缝近的驱动电流电弧，一起它会流入射流。径向传递更多的热量，使切断变宽，切断两边的熔化物在下缘集合并凝结，构成不易固定的熔渣，切断上缘为加热并熔化以构成圆角。

When the cutting speed is too low, because the cutting part is the sun of the plasma arc, in order to maintain the stability of the arc itself, it is necessary to find the driving current arc close to the slit in the solar speckle or solar area, and it will flow into the jet together. More heat is transferred radially to widen the cut-off. The melts on both sides of the cut-off gather and condense at the lower edge to form molten slag that is not easy to be fixed. The upper edge of the cut-off is heated and melted to form a fillet.

冲孔C型钢剪切层流冷却引起的内应力不平衡主要是由三种冷却不均匀引起的，导致：横向冷却很不均匀。厚度方向不对称冷却。厚度和侧冷混合物不均匀。操纵厚度方向上的横向均匀性和冷却对称性来操控板的平整度并减少板的内部应力。经过较低的喷头改进了侧冷却和侧喷计划。选用侧角和静水点，完成层流冷却温度操控的均匀性。

The internal stress imbalance caused by shear laminar cooling of punched C-section steel is mainly caused by three kinds of uneven cooling, resulting in very uneven transverse cooling. Asymmetric cooling in thickness direction. Uneven thickness and side cooling mixture. Manipulate the transverse uniformity and cooling symmetry in the thickness direction to control the flatness of the plate and reduce the internal stress of the plate. Improved side cooling and side spraying plans with lower nozzles. Select the side angle and static water point to complete the uniformity of laminar cooling temperature control.