Tooth surface equation of gear hob
Based on the gear hob coordinate system: SW, (ow: XW, YW, ZW), the involute helicoid model of gear hob is […]
Based on the gear hob coordinate system: SW, (ow: XW, YW, ZW), the involute helicoid model of gear hob is […]
Before the 1990s, the research and production of gear forging were mainly based on physical simulation. That is because the
Super large straight bevel gear is a key component in China’s large-scale equipment. Due to the limitation of transportation and
Gear hobbing processing principle, as shown in the figure. There are many processing methods for cylindrical gears. According to the
In order to study the relationship between vibration and stiffness, the meshing stiffness and frequency spectrum of different modified tooth
The actual forging of spiral bevel gear (without punching and trimming) is shown in the figure. Comparing the numerical simulation
The metal velocity vector diagram of each stage in the upsetting process of spiral bevel gear blank is shown in
In view of the problems of large material waste and high cost caused by the traditional die design and process
The contact pressure history curve during helical gear meshing is shown in Figure 1. It can be seen that the
Based on the selection of basic worm, it is determined that the gear hob selected in this subject is involute
For high-precision hypoid gear pairs, in order to increase the actual coincidence degree after loading, the design of large inclination
The meshing of helical gears can be regarded as line contact, and the load changes and distributes along the contact
1. Law of equivalent stress and time change during helical gear meshing The variation law between the dynamic contact equivalent
The spiral bevel gear blank is set as a plastic body. Determination of initial forging temperature of spiral bevel gear
China’s gear manufacturing industry started late. It began to produce gears in the 1950s and formed its own gear manufacturing
Through the measurement of the straight bevel gear split blank with the coordinate measuring instrument, it can be found that
The overall error curve of helical gear is a complete error curve of helical gear, which is formed by measuring
With the progress of science and technology, the introduction of technology and the deepening of technological transformation, the processing technology
The purpose of this paper is to simulate the forging process of the blank of the driven spiral bevel gear
According to the meshing theory and installation relationship of hyperboloid gear, the gear tooth surface is regarded as an imaginary
In order to improve the comprehensive transmission performance of automobile drive axle, the ease off modification hypoid gear tooth surface
Increase the speed of helical gear from 25rad / s to 35rad / s, and keep the torque unchanged. Using
Hypoid gear is widely used in vehicle main reducer. With the development of spiral bevel gear towards high speed and
The research on spur gear forging at home and abroad mainly focuses on the precision forging of spur gears. The
When machining and manufacturing gear hobs, there is an error between the generating surface of gear hobs and the theoretical
Before machining the straight bevel gear to split the wheel blank, first measure the flatness of the upper and lower
Because the coincidence degree of helical gear is not an integer, its meshing transmission process is alternating between single and
Transmission error is an important excitation that causes the vibration and noise of helical gears. It is a parameter that
The basic research idea is: carry out digital simulation on the gear hobbing process of cylindrical gear, analyze the position
(1) This paper breaks through the condition limitation of calculating the time-varying contact line length of helical gear multi tooth
(1) Equivalent stress nephogram of helical gear at 0.0025s It can be seen from Fig. 1 that the contact stress
The load distribution along the contact line is affected by the position and length of the helical gear contact line.
Forging is a plastic forming processing method, which uses various pressure machines to exert pressure on the metal blank under
(1) Through analysis, it can be seen that there is no mechanism to determine the size of helical gear drum
Many scholars at home and abroad have put forward a variety of theories and methods for helical gear modification. At
The machining error of gear is determined by the process error factors of machine tool, cutting tool, wheel blank and
According to the structural characteristics and the complexity of the tooth profile of the split straight bevel gear, the vertical
According to the research results, the existing problem is to simplify the gear hobbing process in three-dimensional space to two-dimensional
There are many methods to modify the helical gear drum shape. At present, there are mainly the following two methods;
The impact and vibration of helical gear will inevitably occur in the process of transmission meshing, which will increase the
The alignment of gear hob refers to the coincidence degree between the symmetry axis of any tooth (or groove) of
Ensure that the diameter of the spur gear is 3600mm, change the modulus of the spur gear to make it
Figure 1 shows the influence curve of friction on the second-order superharmonic resonance. With the increase of friction, the vibration
Gear hobbing machine is widely used in automobile, machine tool, engineering machinery and other machinery manufacturing industries. In gear hobbing,
The dynamic characteristics of helical gear transmission considering tooth surface friction are studied and further studied and discussed: (1) Due
As shown in the figure, the dynamic contact equivalent stress of helical gear and the history curve changing with time
Nephogram of contact pressure during helical gear meshing: It can be seen from Figure 1 that the contact pressure is
In view of the above problems existing in the current spiral bevel gear machining and manufacturing, a new theory and
The load distribution rate of spur gear in the double tooth meshing area near the root of the tooth is
During gear hobbing, the gear hob axis and workpiece axis must conform to a certain axis intersection angle. Therefore, the
Helix angle is an important structural parameter of helical gear, and it is also the main factor causing time-varying contact
The simulation process of helical gear dynamic contact has been introduced in detail before. The mesh division is also divided
By changing the thickness of spur gear split wheel blank and carrying out finite element analysis on spur gear blank
Local stress concentration is very easy to damage the normal operation of helical gear. Adopting the method of helical gear
In the early 1950s, China’s gear machine tool manufacturing industry began to develop through the full introduction of the technology
The dynamic characteristics of the main influencing factors of helical gear vibration and noise are studied. Considering the dynamic characteristics
Helical gear accuracy mainly controls the transmission accuracy between helical gears during operation, such as transmission stability, instantaneous speed fluctuation,
Pressure nephogram during helical gear meshing: It can be seen from figures 1 to 4 that when two helical gears
The mapping law between machining system error, gear hobbing principle error, tool error, machine tool vibration and gear machining accuracy
The elastic potential energy u formula of spur gear teeth is written as: Where: ux – bending potential energy; un