Supply of steel reinforcement sleeve sleeve chamfering machine chamfering machine chamfering machine features steel sleeve with double simultaneous machining features unique secondary positioning function can be more accurate to ensure the effective guarantee of the position of the workpiece into the processing length. Blanks before machining can not consider the length differences, tolerance up to less than 10mm, the length of the workpiece to ensure that the guarantees within 0.2mm, inside corner unit with a unique flat face down means not only more effective in improving tool life, also it enables the tool to replace the work more quickly and easily.