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Roll forming machine cold precision forging spur gear forming Roll forming machine cold precision forging spur gear is developed on the basis of cold forging, molding without heating because of the blank, Molded parts with good surface quality, dimensional precision, but the temperature of the material forming the low, high deformation resistance, poor mobility, resulting in forging load increased sharply toothed fraught with difficulties, mold deformation wear serious, life expectancy is low, hampering implementation of this technology promotion. Cold roll forming machine precision forging the main problem is how to ensure the tooth cavity filled under the conditions of angular backlash reduce work pressure.