The invention relates to a machining technology of forms of gear teeth, namely a technology for improving tooth profile machining precision of internal teeth of a carburized and quenched gear. The technology comprises pre-machining, heat treatment and finish machining. According to the technology, a gear shaping cutter is polished properly during pre-machining, common normal line allowance for finish of the internal tooth profile is reserved, further finish machining is carried out on the gear after heat treatment, and therefore the machining precision of the gear is effectively improved, and overall mechanical property of the gear is improved.

Technology for improving tooth profile machining precision of internal teeth of carburized and quenched gear

The invention discloses a method for processing a straight bevel gear without grinding a tooth root. The method comprises the following steps of: (1) roughly processing a gear blank, and establishing a gear-shaping processing foundation; (2) gear-shaping processing: performing uprooting processing on the gear by adopting a gear shaping tool which contains a boss cutting edge, wherein the starting point of uprooting is close to the starting point of meshing, and the uprooting amount on a gear root transition curve is 0-0.2 millimeters larger than the grinding allowance of the gear; (3) performing carburizing heat treatment; (4) finely processing the gear and the foundation; (5) grinding teeth; and (6) checking and warehousing. The method has the beneficial effects that the gear shaping tool which contains the boss cutting edge is used for performing gear-shaping processing for uprooting the straight bevel gear in gear-shaping processing, and the straight bevel gear is subjected to tooth grinding processing, so that smooth switching of a tooth surface and a gear root transition curve is realized, a boss of the gear root transition curve is eliminated, non-grinding processing of the tooth root is realized, a pressure stress surface layer of a gear root thermal treatment surface is kept, smooth switching is realized, and the bending strength of the gear is enhanced.

Yang Xinjian

Papers

Method for processing straight bevel gear without grinding tooth root