Triangular pyramid frustum-shaped tool holder interface

The utility model relates to the field of machine part machining, and aims to provide a triangular pyramid frustum-shaped tool holder interface which has the characteristics of firm connection, accurate positioning and good stability. According to the technical scheme, the triangular pyramid frustum-shaped tool holder interface is characterized by comprising a boss and a groove, wherein the boss is arranged on a sliding tool rest, and the groove is arranged on a tool apron and is matched with the boss in shape; the cross section of the boss is gradually increased from the bottom face to the top face, and the side face of the boss comprises three first arc faces. A screw hole is formed in the top surface of the boss; a mounting hole communicated with the groove is formed in the tool apron; when the tool apron is installed on the sliding tool rest, the boss and the groove are matched in an inserted mode and fixed through a bolt. 本实用新型涉及机件加工领域，目的是提供一种三棱台形状刀夹接口，该接口应具有连接牢固、定位精准、稳定性好的特点。技术方案是一种三棱台形状刀夹接口，其特征在于：该接口包括