High precision machining of gear shaft journal with large length diameter ratio
In order to reduce the dimensional error caused by the cutting tool, carry out multiple trial cuts before finishing, master […]
In order to reduce the dimensional error caused by the cutting tool, carry out multiple trial cuts before finishing, master […]
The machining method of gear shaft tooth profile with modulus of 65mm is not exactly the same as that of
The gear processing indexing mechanism device is designed on the special machine tool for variable hyperbolic arc tooth line cylindrical
For the deep hole machining of slender shaft, the key point is the concentricity between the hole and the outer
Within the range of elastic mechanics, Paris gives the fatigue crack growth rate of spur gear expressed by the formula,
According to the connection mode between the tool and the shank used by our company, the tool structure is designed
The gear shaft with modulus of 65mm (see Figure) is one of the key parts in the transmission mechanism of
In the finite element analysis of the whole machine, the contact between parts has a great impact on the analysis
It can be seen from Fig. 1 that the stress distribution near the bevel of the extrusion die is also
In finite element analysis, the solution efficiency is low and the time cost is greatly increased because the machine tool
The special machine tool for variable hyperbolic arc tooth line cylindrical gear is designed based on the principle of spatial
Heat treatment is not only a heating and cooling process of workpiece, but also a process of stress generation and
Within the scope of on-line elasticity, the theory of fatigue crack growth rate of spur gear is mainly Paris theory.
(1) Metal flow field during hot extrusion Figure a ~ C in Figure 1 shows the metal flow state at
(1) Stress analysis of vertical forging process It can be seen from Figure 1 that the stress at the conical
The damage value in deform does not indicate whether there is damage, but the possibility of defects in this part
During the rolling process, the rolled piece begins to fold in the wedge section II, and the shaft is rolled
Use the measuring tool in dfeorm post processor to measure the dimensions of each part of the spiral bevel gear
The fatigue crack growth rate of spur gear is the basis for predicting the crack growth life. Paris formula is
After the end of the wedge section, the forming of the workpiece is coming to an end, and the parts
The process adopts two processes: first, the rod is rolled by cross wedge rolling, and then the cone head is
The tooth profile of a spiral gear has a helical angle with a certain angle. Therefore, when demoulding the spiral
Figure 1 shows the engineering drawing of spiral cylindrical gear bearing structure female die. It can be seen from the
In the process of three-dimensional composite crack propagation, the existing fracture criteria can not completely and accurately describe the crack
Cross wedge rolling drives the workpiece to rotate in the opposite direction of the roll through the same rotation of
This process is planned to adopt one-time rolling forming. Considering the requirements of cross wedge rolling process on the symmetry
Figure 1 shows the engineering drawing of spiral bevel gear bearing structure female die. The outer diameter of the die
Swing rolling of spiral bevel gear is a processing method in which the blank is continuously and locally loaded by
In the swing rolling of spiral bevel gear, there are many factors affecting the forming quality and size of bevel
In the process of spur gear crack propagation, the stress intensity factor changes with the crack propagation. Compared with the
When using rigid viscoplastic finite element method to analyze metal plastic forming, the material meets the following assumptions: (1) ignoring
In recent years, some scholars have done a lot of research on the rotary forging process. The rotary forging of
Figure 1 shows the equivalent stress distribution diagram of closed die forging of spiral bevel gear. Under four reduction quantities,
1.Establishment of finite element model The finite element model is shown in Figure 1. The forging with gears is formed
The blank with lower boss needs to be obtained by large bar cutting, which not only wastes man hours, but
The normal profile is scanned according to the spiral guide line to generate the helical gear profile surface, and then
It is necessary to set up the parameters and mechanical model in the crack propagation process of spur gear by
The blank material is DEFORM-3D material library AISI-4120, the temperature is 850 ℃, the temperature effect in heat conduction and
Figure 1 shows the helical cylindrical gear in the automobile gearbox. The normal surface modulus M = 2.5mm, the number
The solid contour is generated by cutting the solid contour as the spiral surface, and then the contour is generated
For a long time, for designers, the design or development of a process scheme is basically based on production experience.
The combined die is the key component for continuously extruding the external teeth of spur gear. The combined die adopts
When the module, number of teeth, helix angle and process parameters of helical gear are consistent, three groups of different
① Hot forging blank The material of spur gear in truck wheel reducer is 20CrMnTi. Solid bar is selected as
The difference between helical gear and spur gear is that the teeth of helical gear are distributed along the helix.
The continuous extrusion forming process of the external teeth of the spur gear is the same as that described above.
Due to the formula of indexing circle diameter d = mz, it can be seen that the diameter of the
1.Influence of blank temperature The blank temperature of spiral gear is 20 ° C, 450 ° C and 850 °
Closed die forging process is a traditional one-step process. Its forming process is simple and convenient for analysis and research.
In order to clearly see the deformation process of inner and outer teeth in the forming process of spur gear
All teeth on helical cylindrical gears are the same and have unified characteristics. The normal tooth profile will be generated
The numerical simulation analysis is based on the assumption of rigid plastic finite element model. Properly combine and simplify the
Based on the existing forming methods of driving and driven bevel gear blank of automobile rear axle, a new composite
The figure shows the metal velocity distribution of different strokes in the cold finishing process of spiral bevel gear, in
As the starting point of casting forging compound forming process, whether the process design of casting process and the control
1. Tooth surface contact analysis of spiral bevel gear Based on the above theoretical methods, the whole process design software
1.Load stroke curve Figure 1 shows the load stroke curve of hot die forging process of different taper schemes of
Shu Qifu once put forward the concept of “equivalent blank” to study the influence of taper on the forming process
1.Load stroke curve Fig. 1 is the load stroke curve of spiral bevel gear blank obtained according to the approximate
The figure shows the distribution of equal effect variation in the final step. From the figure, it can be seen