In producing practice, heat is out of shape can cause adverse effect, if cause work,be out of shape serious and discard as useless etc. But if grasp its fundamental and metabolic pattern, can use the difficult problem in solve production. 1. The I-steel generation that a 10m grows long bridge alignment is out of shape, linearity achieves 30mm, mid degree of curvature is the biggest (graph 1) . Among choice length place, bottom stands by spoke board two side are A of thermal treatment zone, wet cloth is placed in two B area, reduce temperature rise as far as possible. When A Ou Weigong, irrigate with cold water, when the temperature that waits for I-steel is balanced completely, its degree of curvature decreases apparently. Next, add at the same time to two B area again lukewarm hind, use water to cool. After classics here manages, i-steel linearity achieves a requirement. Use this law to need to notice to avoid overcorrect. 2. Straightening has large canister door a bigger vacuum pot, its canister door hefts 7t, because welding stress generation is out of shape, flatness out of tolerance, cannot use. Be out of shape the circumstance is shown 2 times like the graph, flatness error amounts to 20mm to use blaze corrective, be opposite at the same time with 4 torch two A area heats quickly, drop in temperature to B area with wet cloth, when waiting for A Ou Weigong, irrigate with cold water. Heat to B area again next, drop in temperature to A area with wet cloth, when waiting for B Ou Weigong, irrigate with cold water. As a result a loop comes down, eliminate the degree of curvature of 20mm completely, redeemed several yuan loss. CNC MillingCNC Machining