Precision forming method of tool profile for special-shaped screw

Improving the profile accuracy of a forming tool is one of the important measures to ensure the profile accuracy of a screw. Aiming at accurately forming the tool for the screw with a complex profile, a precision forming method of tool profile was proposed by comprehensively considering its design and the dressing process. The smooth tool profile was designed based on the profile and position relationship between the screw and tool. Considering that the arc radius of the abrasive grain of the roller can not be ignored during the sectional dressing process, an interference verification method for the continuity of the trajectory of the abrasive grain of the roller is proposed. And the correctness of the precision forming method was verified by the forming grinding example of a screw. The tool profile accuracy is ensured from the whole process of design-dressing, which lays a foundation for improving the forming accuracy of a screw.