The invention relates to a method for processing the plane of artificial sheet thermal compressor, which uses national general digit-control crane boring-mill machine to bore and mill the plane to realize the high roughness and flatness, wherein said thermal compressed sheet is the pretreated mould steel, whose rigidity is HRC40, and the plane size of work-piece is large. The invention adjusts the accuracy of machine, adjusts the plane milling blade, and the work-piece is clamped via the electromagnetic absorb disc, via special parameters and digit-control program, using high-pressure air to cool it, to realize the high accuracy demand. The smoothness of inventive product can reach Ra0.4-Ra0.2, and flatness can reach 0.10. |