Study the tooth surface forming principle of face hobbing Cycloid Bevel gear, and form a complete set of theories and methods of face hobbing, such as cutting adjustment calculation, contact performance control, motion control of full CNC machine tool, tooth profile error measurement and correction; The research results are demonstrated and applied in relevant enterprises to promote the development process of spiral bevel gear end hobbing equipment in China and promote the popularization of end hobbing method in China.
① Principle and geometric design method of face hobbing of spiral bevel gear
By analyzing the transmission chain composition of the traditional mechanical end face hobbing machine tool, the formation principle of the production wheel for end face hobbing is studied; The mathematical model of the relative motion relationship between the production wheel, the shaking table of the machine tool, the cutter head and the workpiece is studied; The calculation method of pitch cone parameters and tooth geometric parameters of spiral bevel gear machined by end face hobbing are studied.
② Calculation method of cutting adjustment and control method of contact characteristics in face hobbing
Based on the meshing theory of space gear, the calculation method of profile tooth surface equation and its geometric parameters are studied; The method of determining the positioning parameters of the wheel blank according to the meshing pitch cone of the cutting gear and the pitch cone of the gear pair, and the installation and shape parameters of the cutter head according to the normal vector and curvature of the tooth surface are studied; Combined with the idea of controlling the tooth contact area of Gleason and Oricon, a method which can better control the contact performance parameters such as the position, size, direction and transmission error of the tooth contact area is studied;
③ Tooth surface contact analysis and contact characteristic optimization method of spiral bevel gear in face hobbing
The contact analysis method of theoretical tooth surface of spiral bevel gear for face hobbing is studied; On this basis, the influence of different contact characteristic control parameters on the tooth contact characteristics of spiral bevel gear machined by end face hobbing is analyzed; Based on the finite element method, the influence of different contact area forms on the internal excitation of tooth meshing is analyzed, and on this basis, the contact characteristic parameters of end hobbing spiral bevel gear are optimized.
④ Machining method and software development of full NC end face hobbing
This paper analyzes the structural characteristics of full numerical control spiral bevel gear milling machine and traditional mechanical gear milling machine; The motion control model of machine tool to realize end face hobbing on full CNC machine tool is established; Based on Siemens 840dsl CNC system, the motion realization method of end face hobbing on full CNC machine tool is studied, and the NC software of end face hobbing is developed.
⑤ Experimental verification of face hobbing machining and optimization of contact characteristics
Carry out the experiment of spiral bevel gear face hobbing, and verify the correctness of the full NC face hobbing method and its software; This paper studies the measurement method of pitch and profile of face hobbing spiral bevel gear on the domestic gear measurement center and the accurate automatic correction method of profile deviation. Combined with gear cutting experiment, tooth profile measurement and correction experiment and rolling inspection experiment, the correctness of gear cutting adjustment calculation and contact characteristic optimization method in face hobbing machining is verified.
This paper expounds the development process and research status of spiral bevel gear technology at home and abroad, and analyzes the research status of spiral bevel gear end hobbing technology and spiral bevel gear full NC machining technology.