Improvement of heat treatment process for forged gear blank
In the original process, the forged gear blank is directly air cooled to room temperature after forging, and then rough […]
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Numerical results of differential eccentric gear based on unequal division model
Programmed and calculated under Matlab, when the number of coordinate points of involute working tooth profile of reference tooth is
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Structural characteristics and working mechanism of eccentric gear noncircular gear planetary system transplanting mechanism
The schematic diagram of the eccentric gear non-circular gear planetary system transplanting mechanism is shown in Figure 1. The relative
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Asymmetric design process of upper and lower dies for gear blank forging
In the process of gear blank forging, due to the cylindrical upsetting effect of the blank, the contact area between
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Improvement of forging process of gear blank
Taking the forging of a large gear blank as an example, the forging drawing is shown in Figure 1, with
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Optimization analysis of forging parameters of gear blank
According to the comparative analysis of the four schemes in Figure 1, Φ 100mm bar has the best forming effect
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Reference standard for forging forming of gear blanks
The main reference standards for evaluating the final forming quality of gear blanks are as follows: (1) The hub part
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Finite element analysis of spiral bevel gear
The setting of finite element preprocessing is very important, which not only determines whether the spiral bevel gear can converge
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Finite element analysis scheme of forging gear blank
A gear blank requiring precision forging is studied. The number of teeth of the gear is 29 and the diameter
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Step beam automatic feeding system for forged gear blank production
In the traditional forging production, the material is fed manually and positioned by relying on the positioning block with simple
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Control of uniform cooling of gear blank by isothermal normalizing
In order to improve the machinability of gears for transmission and stabilize the final heat treatment deformation, a company purchased
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Analysis of surface crack of s40c steel gear
According to the above inspection results, the cracking of steel gear tooth surface is caused by contact fatigue caused by
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How to prevent gear grinding cracks caused by carburizing and quenching of rolling mill
The gear material of the failed rolling mill is 17CrNiMo6 steel, the modulus Mn is 9mm, the carburizing and quenching
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Fracture failure analysis of ZG35CrMo large forged gear blank
Produced by a company φ 2100mm large forged gear blank with a weight of 6000kg was found to be cracked
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Analysis of velocity field distribution and evolution law of spiral bevel gear
Velocity field is a vector to measure the flow of material in the process of plastic deformation. Through the observation
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Case of gear grinding crack caused by carburizing and quenching of rolling mill
The rolling mill gear shaft with grinding cracks is made of 17CrNiMo6 steel, the modulus Mn is 18mm, the carburizing
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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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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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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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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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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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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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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
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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
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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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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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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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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
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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
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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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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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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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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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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
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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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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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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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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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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
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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
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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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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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Heavy load transmission gear test device
According to the differences of loading methods, structural types and working modes of gear test devices, they can be divided
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Test methods for heavy duty transmission gears
The main form of gear failure is bending fatigue failure. According to the failure physical stress intensity model, it is
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Analysis on distribution law of stress intensity factor at crack tip of heavy load transmission gear
As an important index of engineering fracture analysis, stress intensity factor is adopted by most scholars. The proposal of stress
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Prediction of crack propagation life of heavy duty transmission gears under different stress ratios
Multiply both sides of Paris formula by Da and integrate to obtain the formula: By substituting the stress ratio r
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Nephogram of maximum principal strain at crack tip of heavy load transmission gear under different crack lengths
Comparing the solid line and dotted line in Figure 1, for the same material, the value of plane stress under
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Mesh generation of dynamic crack propagation model of heavy load transmission gear
As the carrier of simulation calculation, grid plays a decisive role in the quality of simulation results. The selection of
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Spectrum analysis method of tractor gear vibration
When the tractor gear has defects, in the process of meshing transmission, the defects will have an impact on the
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Experimental study on fatigue crack growth rate of heavy transmission gear under different stress ratios
1) Define the ultimate load and maximum fatigue load The sample is fixed on the fixture by two round pins.
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Spectrum analysis method of tractor gear vibration
The comprehensive use of characteristic parameters can make a simple diagnosis of tractor gearbox, that is, to judge whether there
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Three stages of fatigue fracture of heavy load transmission gears
The fatigue fracture process of metal materials can be divided into three stages: crack initiation, propagation and instantaneous fracture. In
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Fatigue crack propagation law formula of heavy load transmission gear
According to the formula, the stress intensity factors Ki, Kii and kiII are mainly used to characterize the stress field
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Frequency domain characteristic parameter analysis of tractor gear vibration
Through theory and experiment, it is proved that when the tractor gearbox has no fault, the vibration signal energy is
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Fatigue crack propagation law of heavy load transmission gear
At present, the research on the law of fatigue crack growth mainly uses experimental methods and numerical analysis methods. According
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Force balance condition of spiral bevel gear
At a certain moment of gear transmission, the locally conjugate tooth profile engages and transmits load. When more than two
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Kinematic coordination conditions of spiral bevel gears
In the process of gear transmission, the rotation angle of each tooth of the driven gear can be expressed as:
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Gear resonance demodulation of tractor gear vibration signal
When the vibration energy is large, such as broken tooth, serious tooth profile error and serious shaft bending, it will
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Basic equation of spiral bevel gear transmission
When considering the deformation of gear teeth under load, the basic meshing equation shall be rewritten as: Δ r2、 Δ
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Meshing modulation of gear vibration in practical work of tractor gears
Various defects will inevitably occur in the process of gear processing, installation and use, such as crack, tooth surface fatigue,