Indicator of bending strength of planetary gear satellite teeth, cut with non-standard tool of various types

A method is presented for determining the radii of curvature of the transition curves of the tooth profiles of satellites of planetary gears with internal gearing of wheels, cut by a tool with a modified initial contour and having increased bending strength. A comparative analysis of the radii of curvature of the profiles of the teeth of the satellites, cut with standard and non-standard tools of different types (gear shaping and rack) is carried out. Keywords: non-standard gear cutting tool, transition curve, radius of curvature. [email protected]

Study on the influencing factors of the deformation in the process of gear shaping

Ring gear is an important part of high-power transmission system. Because of its thin wall and low stiffness, it is easy to produce deformation in the process of gear shaping, which affects its accuracy. In order to ensure the machining quality of gear shaper, this research focuses on the typical material 42CrMo, which is used in the gear ring of automobile gearbox. Through the finite element simulation and actual test, the influence of gear shaper cutting parameters on the deformation of gear ring is studied. The results show that the influence of the main cutting parameters on the deformation of the ring gear is in the order of radial feed, circumferential feed, stroke speed and cutting depth. In the actual gear shaping process, the cutting parameters can be adjusted according to the deformation law of 42CrMo workpiece in the gear shaping process, so as to control the deformation of gear ring.

Simulation Machining of Hardened Gear Shaping and Finite Element Analysis

Existing simulation processing methods are difficult to obtain the tooth surface that is close to the actual processing. This paper proposes a high-precision simulation processing method for hard tooth surface gearing. Through the establishment of a high-precision cutter and tooth blank geometric model, analysis of the kinematics principle and meshing relationship between the cutter and tooth blank, combined with the functions of rotation, translation and Boolean operation in the 3D software, the high-precision shaping simulation processing of hardened gears is realized. By measuring the normal distance between the standard involute and the gear tooth profile, the tooth surface error analysis is completed. The simulation model is reconstructed, and the models are analyzed by finite element method (FEM) respectively, and the effectiveness of the method in this paper is verified by comparing the analysis results.

The optimization of friction disc gear-shaping process aiming at residual stress and machining deformation

Friction disc is the key part of the frictional clutch. But there is a lack of in-depth studies on the effect of the cutting parameters on residual stress and machining deformation. In this study, the simulation model for friction disc gear shaping was established and the effect of the typical cutting parameters on surface residual stress and machining deformation was studied. Based on the study’s results, the optimization experiment of friction disc gear shaping was carried out and a method was proposed to reduce machining deformation and to improve the fatigue life. Applying the proposed method, the residual stress on the tooth bottom increased from −122.50 to −371.33 MPa, an increase of 203.13% that increases the fatigue life greatly. Meanwhile, the front and bottom face deformation of the outer ring as well as the deformation of the front and bottom tooth tip can be decreased effectively. This study can provide technical support for improving the comprehensive performance of the friction disc and transmission system.

Features of technology for manufacturing cast toolbills from rapid-cutting steel R6M5

The article presents the results of computer simulation of the crystallization of castings from high-speed steel R6M5, intended for the manufacture of cutters and gear shaping tools in the conditions of OJSC “Minsk Gear Plant”. The use of modeling made it possible to optimize the gating system, reduce this volume of the profitable part by 30–35 % and increase the yield of suitable casting, which made it possible to reduce the consumption of expensive alloying elements introduced into the melt to compensate for burnout during melting and casting.

Geometry of Internal Meshing of Planetary Gearwheels Cut by Non-standard Gear Shaping Tools

Приведен метод определения радиусов кривизны переходных кривых профилей зубьев сателлитов планетарных передач с внутренними зацеплениями колес и малой разницей чисел их зубьев. Для нарезания таких колес передачи целесообразно использовать нестандартный инструмент со скругленными вершинами зубьев. Представлен модифицированный исходный производящий контур и соответствующий ему профиль зуба производящего колеса (долбяка) в среднем сечении. Вершина зубьев такого режущего инструмента в отличие от стандартного скруглена, а высота их делительной головки уменьшена. Осуществлен сравнительный анализ радиусов кривизны профилей зубьев сателлитов, нарезанных стандартным и нестандартным инструментом разного типа (зубодолбежным и реечным).Показаны зависимости относительного радиуса кривизны переходных кривых профилей зубьев сателлита и колеса от углового параметра, определяющего положение режущего инструмента, позволяющие оценить их изгибную прочность в сравнении с зубьями колес, нарезанных стандартным инструментом. Представлены результаты выполненного компьютерного моделирования на участках переходных кривых профилей зубьев. Установлено, что на этих участках радиус кривизны переходной кривой профиля зуба сателлита, нарезанного нестандартным долбяком, несколько больше аналогичного параметра колеса, нарезанного таким же инструментом. Однако так как толщина зуба колеса намного больше толщины зуба сателлита, лимитирует несущую способность исследуемого зацепления колес и планетарной передачи в целом изгибная прочность зубьев сателлита. Расчеты по приведенным зависимостям показывают, что при нарезании колеса и сателлита планетарной передачи нестандартным долбяком планетарная передача работоспособна, не подвержена опасности заклинивания и имеет высокую нагрузочную способность.