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我厂生产的变压器用散热弯管,系采用φ41×1.6毫米有缝钢管轧扁冲弯而成。在冲弯过程中,凹模主要承受着垂直压力和水平摩擦力,由于这两个力的作用,加之工件材质杂,批量大(月产2万件左右),使凹模磨损严重,使用寿命低。在弯制锈蚀材料时,这一问题显得更为突出。凹模原来用Cr12钢制作,硬度为HRC60左右,一般使用一周左右(约冲制5～6千件),即以型槽底部呈沟槽状磨损的形式而失效,
My factory production of transformers with cooling pipe, the Department of the use of φ41 × 1.6 mm seam-welded flat rolled steel bending. In the bending process, the die mainly to withstand vertical pressure and horizontal friction, due to the role of these two forces, combined with the workpiece material miscellaneous, large quantities (monthly 20,000 or so), the die wear serious, service life low. This problem is even more pronounced when bending corroded materials. The original die made of Cr12 steel, hardness of HRC60 or so, the general use of about a week (about 5 to 6 thousand pieces of stamping), that is, groove-shaped grooves at the bottom of wear and tear failure,