Causes and preventive measures of grinding cracks in carburized and quenched gears of rolling mill
Gear is an important basic part of mechanical products. Gear grinding is a finishing process of gear processing. Gear grinding […]
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Rotary forging process of bevel gear
Swing rolling, namely swing rolling, also known as axial rolling, is a new plastic processing technology gradually and widely used […]
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Grinding of hard tooth surface of cylindrical gear
1. Processing with Norton 3SG60 grinding wheel (1) rough grinding: the 1st ~ 3rd cutters are in the form of […]
Scientific
Forging process scheme of large module spiral bevel gear
Figure 1 shows the driven bevel gear of rear axle in 46910 / 37 commercial vehicle. It can be seen […]
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Application of precision die forging technology in bevel gear machining
The general plastic precision forming process is precision die forging, which is a less cutting process gradually developed from general […]
Scientific
Process design and optimization of precision forging technology for spiral bevel gears
The precision forging process of spiral bevel gear generally has some problems, such as difficult forming, difficult cavity filling, low […]
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Research conclusion of fatigue crack and data simulation of heavy load transmission gear
Taking the transmission gear of heavy equipment as the research object, the fatigue crack propagation and fatigue fracture of gear […]
Scientific
Effect of burning loss of electrode on electrode tooth profile in precision forming of bevel gear by cold rotary forging
In the process of EDM, the electrode will have a certain amount of burning loss, which will change the electrode […]
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Study on grinding burn and crack of hard tooth surface of cylindrical gear
For the finish machining of hardened cylindrical gears, gear grinding technology is a common choice at present. On the premise […]
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Establishment of bending fatigue model of transmission gear in heavy equipment
The model used for the numerical simulation of gear bending fatigue is the same as that used in the bending […]
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Digital real tooth surface modeling of hypoid gear based on non characteristic block interpolation technology
Hypoid gear is widely used in aviation, automobile and other fields. As an important index to predict its dynamic performance, […]
Scientific
Relationship between feed per revolution s and average pressure P per unit area of contact surface in precision cold rotary forging of bevel gear
When rolling the thick cylinder of the pier, the relationship between the feed rate s per revolution and the average […]
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Analysis on key manufacturing technology of large herringbone gear
1. Technical analysis of forging process In offshore engineering, the requirements for large herringbone gears are relatively high. The original […]
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Numerical simulation of bending fatigue of 42CrMo heavy equipment transmission gear
When testing the bending fatigue of 42CrMo heavy equipment transmission gear by experimental method, the data results have obvious advantages, […]
Scientific
Relationship between feed rate per revolution s and width BB of active deformation zone in cold rotary forging precision forming of bevel gear
The feed rate per revolution of the cone die is the reduction amount per revolution, which is the reduction amount […]
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Analysis of bending fatigue test results of heavy load transmission gears
Before the formal bending fatigue test, the load level of the test needs to be determined. Pick two from the […]
Scientific
Selection of the movement track of the swing head in precision forming of the bevel gear by cold rotary forging
For the five kinds of swing head motion trajectories in the figure, they are analyzed one by one as follows: […]
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Selection of fatigue crack evolution test method for heavy load transmission gear
The bending fatigue characteristic curve and bending fatigue limit stress of the test gear shall be combined according to different […]
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Offshore engineering and large herringbone gear manufacturing
1. Advantages of large herringbone gear in aviation and ocean engineering The diameter of large gears used in aviation and […]
Scientific
Trajectory of swing head in precision forming of bevel gear by cold rotary forging
The motion track of the swing head refers to the projection track of any point on the axis of the […]
Scientific
Simulation results and discussion of induction heating of large spur gears
Figure 1 shows the front view of the temperature field on the single tooth profile surface and the middle section […]
Scientific
Design of preform for bevel gear rotary rolling deformation
Due to the eccentric load on the workpiece during rotary forging, the metal flow is uneven. If the preform is […]
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Sample design of heavy duty transmission gear
The transmission gear of heavy equipment used in the bending fatigue test is designed based on the gear applied in […]
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Application of large herringbone gear manufacturing technology in Offshore Engineering
Among the key areas of China’s planning, marine engineering is the most important project and development field. Marine engineering includes […]
Scientific
Deformation of thick workpiece in rotary forging of bevel gear
The so-called “thick piece” revolving body means that the thickness h is greater than or equal to the radius R […]
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Design of fixture for fatigue crack evolution test of heavy load transmission gear
The test adopts the form of single tooth loading. It is necessary to design special fixtures according to the standard […]
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Analysis of cycle times of different crack length and stress intensity factor at crack tip of heavy load transmission gear
The stress ratio r = 0.6, the number of cycles n corresponding to the stress intensity factor at the crack […]
Scientific
Active deformation zone and passive deformation zone of bevel gear rotary forging deformation
The essence of swing rolling is a special two roll rolling. In the process of rotary forging, although the swing […]
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Statistical analysis of crack length and stress intensity factor at crack tip of heavy load transmission gear
In order to verify the correctness of the above crack propagation, the crack length and crack tip stress intensity factor […]
Scientific
Study on precision forming process of bevel gear by cold rotary forging
The cold rotary forging precision forming process of bevel gear is an advanced manufacturing technology. Its process design in actual […]
Scientific
Study on propagation law of heavy-duty gear under different initial crack angles
The equivalent stress at the crack tip under different crack inclination angles is extracted and plotted, and the equivalent stress […]
Scientific
Bevel gear hypothetical production wheel
Hypothetical generating wheel is usually used to explain the machining process of bevel gear. It is a virtual bevel gear […]
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Load and boundary conditions of dynamic crack propagation model of heavy load transmission gear
The dynamic continuous growth of fatigue crack is realized by resetting the crack length each time. In the numerical simulation […]
Scientific
Study on crack propagation law of heavy duty gear under different initial crack positions
Study the crack propagation law when the initial crack position H0 is 60mm, 62mm, 64mm, 66mm, 68mm and 70mm respectively, […]
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Fracture morphology of instantaneous fracture zone of heavy load transmission gear
Fig. 1 shows 150, 300, 500 and 1000 times SEM images of fatigue fracture in the instantaneous fracture zone. The […]
Scientific
Numerical simulation analysis of crack propagation in tooth root of heavy duty gear
In the actual process of gear meshing, the maximum contact stress usually acts on the tooth surface of the pinion. […]
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Fracture morphology of stable fatigue crack propagation zone of heavy load transmission gear
Under the continuous loading of cyclic loading and unloading, the slip band around the crack tip deforms, resulting in the […]
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Finite element simulation of contact fatigue of hypoid gear
Hypoid gear is a bevel gear with central axis offset. The tooth surface surface of this type of gear is […]
Scientific
Example of time-varying equivalent meshing of hypoid gears
At 3 000 n · The equivalent time-varying meshing parameters of hypoid gear in one cycle are calculated according to […]
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Finite element analysis and verification of hypoid gear
The transmission error curves obtained by finite element method and classical TCA method are compared to verify the correctness of […]
Scientific
Crack propagation principle of heavy duty gear based on extended finite element method
In order to simulate the singularity and discontinuity of element displacement stress, it is realized by constructing the extended functions […]
Scientific
Simulation results and analysis of hypoid gear transmission system
According to the established contact fatigue finite element simulation model of hypoid gear transmission system, the finite element simulation software […]
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Analysis of macro fracture morphology of fatigue crack sample of heavy load transmission gear
It can be seen that the fracture clearly presents three regions with different morphological characteristics, as shown in Figure 1. […]
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Analysis of 20CrMnTi tooth surface roughness based on Gear Hobbing
In recent years, the machining of mechanical parts is developing in the direction of intelligence and efficiency. With the increasing […]
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Observation method of fatigue fracture morphology of tensile specimens of heavy transmission gears
The morphological characteristics of fracture reflect the quality of materials and play an important role in material quality inspection, fault […]
Scientific
Influence of crack shape on stress intensity factor at crack front of heavy duty gear
Under the influence of crack shape, the change of mode I stress intensity factor is studied. In the process of […]
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Machining error of gear in transmission system of shearer cutting section
The transmission system of shearer cutting part has the advantages of compact structure and high bearing capacity, and can realize […]
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Statistical analysis of extended life of heavy transmission gears under different stress ratios
Under the action of cyclic load, cracks begin to appear and grow, and the remaining life of the sample is […]
Scientific
Analysis of calculation results of stress intensity factor at leading edge of root crack of heavy-duty gear
Under the set parameters, the gear model is simulated. As shown in the figure, the trend distribution of stress intensity […]
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Compact tensile specimen for fatigue crack of heavy transmission gear
By referring to the national standard GB / t6398-2000 test method for fatigue crack growth rate of metallic materials, the […]
Scientific
Establishment of three-dimensional model of heavy-duty gear by ABAQUS
The modeling module of ABAQUS software can effectively establish three-dimensional models, but most of them are suitable for three-dimensional model […]
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China gear basic technology
(1) Present situation In the aspect of gear profile, because the involute gear has the advantages of convenient machining and […]
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Research content of fatigue crack evolution of heavy load transmission gear
The fatigue crack evolution test and numerical simulation of transmission gears of heavy equipment are studied. The preparation of compact […]
Scientific
Stress intensity factor theory of root crack of heavy duty gear teeth
The characteristics of crack propagation under the influence of external force factors are as follows: 1) The crack surface is […]
Scientific
Bending fatigue life analysis of gear based on ABAQUS / FE-SAFE
ABAQUS / FE-SAFE is used for joint simulation. The analysis process is as follows: firstly, the fatigue analysis software FE-SAFE […]
Scientific
Gear cutting processing of circular arc tooth line gear blank conical end mill
According to the formula, the relationship between LA and FA can be used to change any shape. The machining mechanism […]
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Research background of fatigue state of heavy load transmission gears
The transmission gear of heavy equipment has low rotation speed in the process of transmission operation, but needs to bear […]
Scientific
Fatigue life prediction of heavy load transmission gear by bending test
Through verification, 40 test data under 5 load levels meet the requirements of lognormal distribution. Therefore, the distribution function f […]
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Dynamic research on bending fatigue of heavy duty transmission gears
J. Kmmberger proposed that it is necessary to carry out anti fatigue design for mechanical components bearing periodic load. Therefore, […]
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Historical review of gear transmission in China
In the 1960s, the Washington Museum exhibited the model of ancient Chinese guide car. According to archaeological evidence, this guide […]