Causes and control methods of gear heat treatment deformation
Gear is the main work piece in mechanical transmission, and it is also an important force unit. Due to the […]
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Measurement of tooth profile error of straight involute gear
Based on the generating principle of base circle involute, the tooth profile measurement method of involute gear is proposed °
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Kinematic geometry measurement concept of gear accuracy
Gear kinematic geometry measurement technology is a kind of technology to study and realize gear geometric error measurement from the
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Accuracy measurement of involute profile of gears
Around 1920s, people began to discuss the problem of gear accuracy measurement. In 1922, Switzerland applied for the patent of
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Vibration mechanism of planetary gearbox
Planetary gearbox is mainly composed of central shaft, planetary gear and sun gear. In the gearbox fault, the probability of
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Research on fault diagnosis of gearbox
As a device that can effectively change the speed and transfer power, gearbox is widely used in various types of
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Tooth surface detection formula of hourglass worm gear
Let the circumferential matching angle between the measuring coordinate system and the theoretical coordinate system be φ P. Then the
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Research on fatigue crack of low speed and heavy load gear
Taking low-speed and heavy-duty gear as the research object, the fatigue crack propagation and fatigue fracture of gear teeth are
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Detection principle of hourglass worm gear tooth surface
In order to obtain the actual coordinate points of the hourglass worm tooth surface, the coordinate machine or gear measuring
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Bending fatigue test of low speed and heavy load gears
Before carrying out the bending fatigue test, it is necessary to determine the stress level of the test. Two of
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Geometric model of each gear rotor
The figure shows the rotor model of a typical integral 5-stage centrifugal compressor. As shown in figure a), TST, WST,
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Fatigue crack of compact tensile specimen of 42CrMo steel low speed heavy duty gear
Fatigue cracks often occur when the component is under the condition of alternating load for a long time. The initial
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Determination of fatigue stress dangerous position of pinion
In general, the fatigue failure of gear is to produce microcracks at the position of the maximum stress of gear
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Calculation of revolution angle of noncircular gear shaper cutter
When the pitch circle of the gear shaper cutter rolls along the pitch curve of the non-circular gear, it not
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Analysis on fatigue crack propagation of low speed and heavy load gears
The fatigue crack growth mechanism of 42CrMo steel was studied by fatigue crack growth test. The law of fatigue crack
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Nephogram of contact pressure distribution and contact state of low speed and heavy load gears
Figure 1 is the contact pressure diagram of the gear in the process of meshing, and the pressure distribution of
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The condition of noncircular gear design
The diagram of stepless transmission mechanism is shown in Figure 1. The driving noncircular gears 1 and 3 are the
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Analysis of fatigue fracture morphology of low speed and heavy load gears
Fatigue fracture is the surface formed by the fatigue fracture of the test sample or component during the test or
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Variation of equivalent stress and time in meshing process of low speed and heavy load gears
The results of the overall equivalent stress of the gear are shown in Figure 1. The variation law of dynamic
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Tooth surface construction of pure rolling internal meshing line gear based on cylindrical helix
On the basis of space curve meshing theory, the tooth surface construction of parallel shaft pure rolling internal meshing line
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Fatigue fracture analysis of low speed and heavy load gears
The macro morphology of fatigue fracture of low speed and heavy load gear teeth can be divided into three obvious
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Failure analysis of forging of a fuel gear pump shell
Macro analysis It can be seen from Fig. 1 (a) that the cracks are exposed on the forging surface, the
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Research on fatigue crack growth behavior of low speed and heavy load gears at China and abroad
With the continuous improvement and innovation of fatigue crack testing methods, the research on small fatigue cracks has gradually changed
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Research on fatigue damage of low speed and heavy load gears by Chinese scholars
Wu Zhenpeng and others took the helical gear as the research object, modeled the helical gear, simulated the crack propagation
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Fatigue life prediction of low speed and heavy load gears
Since the test data under each stress level obey the lognormal distribution, when the normal probability density function is known,
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Calculation principle of chord tooth thickness and chord tooth height measurement of double circular arc gear
The normal chord tooth thickness is the shortest distance between the two theoretical contact traces (spatial helix) on the left
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The formula used to draw the tooth profile and base circle of helical gear end face
The following equation can be obtained from the geometric knowledge of involute gear: Where, α T is the end face
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Study on bending fatigue damage and life of low speed and heavy duty gears
Robert Basan proposed the mathematical model of slip line contact and the calculation model of multiaxial fatigue life based on
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S-N curve and P-S-N curve of low speed and heavy load gear
The number of fatigue cycles under four stress levels is counted in the order from small to large, and the
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Processing technology optimization of low speed and heavy load mechanical gear
Although the strength of mechanical gear bearing capacity does not entirely depend on gear hardness, improving gear hardness is still
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Vibration characteristics of cylindrical gear pair considering tooth thickness deviation
Gear transmission is one of the most commonly used transmission in all kinds of machinery, which has the advantages of
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Calculation of tooth root stress of low speed and heavy load gear
Before calculating the tooth root stress of the gear, it is necessary to find the exact position of the load
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Design optimization of low speed and heavy load mechanical gear
Because the mechanical operation is mostly heavy load, medium and low speed transmission, most of them start frequently and often
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Design of low speed and heavy load gear specimen
Before carrying out bending fatigue strength, the primary task is the design and manufacture of gear specimens. Because the object
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Material selection of low speed and heavy load mechanical gears
Comparison of machinability and forgeability between Ni Cr and Ni Cr Mo steels The machinability of different materials is mainly
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Bending fatigue test of low speed and heavy load gears
In order to study the problem of fatigue crack propagation and fatigue life of low-speed and heavy-duty gear, a low-speed
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Statistical analysis of crack length and fatigue life of low speed and heavy load gears
For the statistical analysis of this section, the relevant data of stress ratio r = 0.6 is also used. The
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Effect of lubrication contact on gear pitting load condition
According to the theory of elastohydrodynamic lubrication, the lubricant entering into the crack will form a certain pressure inside the
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Material selection and technical requirements of low speed and heavy load mechanical gears
Other countries in the world mainly use Cr Ni and Cr Ni Mo carbon steel. Compared with Mn Cr steel
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Statistical analysis of crack length and crack tip stress intensity factor of low speed and heavy load gears
In order to verify the accuracy of the fatigue crack growth test of the compact tensile specimen, the data of
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Verification of numerical model for the effect of lubrication contact on gear pitting process
In order to verify the correctness of the numerical model, Hertz pressure distribution is applied on the contact model, and
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Material selection and design optimization of low speed and heavy load mechanical gear
Gear is a kind of mechanical element with continuous meshing transmission of motion and power on the rim, which plays
Scientific
Analysis of stress intensity factor at crack tip of low speed and heavy load gear
The theoretical Mises stress nephogram distribution law of the numerical simulation model of compact tensile specimen under macro state is
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Experimental verification of gear residual life
1. Data acquisition In the experiment, the gear fatigue life test-bed as shown in Figure 1 is used to monitor
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Deep carburizing of heavy duty gears
Although the deep carburizing of large heavy duty gears improves the bearing capacity and prolongs the service life, it still
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Research on wear of low speed and heavy load gears
Tooth wear is one of the main failure forms of low speed and heavy load gear transmission. H. Winter has
Scientific
Establishment of fatigue crack propagation model for low speed and heavy load gears
The model used for numerical simulation of fatigue crack growth is the same as that of 42CrMo steel compact tensile
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Standards and technical requirements for developing deep carburized heavy duty gears
The important parameters to ensure the load-bearing capacity of low-speed and heavy-duty hard face gear are: enough central strength and
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T-sne dimension reduction analysis of shearer rocker gear fault
In order to more clearly reflect the output classification status of features in each layer of RESNET model, t-sne technology
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Fatigue life analysis of low speed and heavy load gears
With the continuous progress of the test, under the action of cyclic load, cracks appear on the sample and continue
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Equipment requirements for developing deep carburizing large heavy duty gear
The deep carburizing of large heavy duty gears has a history of more than 10 years in foreign countries, with
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Fault diagnosis model of shearer rocker gear based on RESNET
1. Selection of residual unit module In RESNET, there are two kinds of residual unit modules: original residual unit module
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Analysis of relationship between crack tip stress intensity factor and propagation rate of low speed and heavy load gear
The fatigue crack growth rate DA / D N and the stress intensity factor at the crack tip under different
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Reasonable selection of hardening heat treatment method for low speed and heavy load gears
It is very important to choose the hardening heat treatment method of low speed and heavy load gear reasonably. The
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Analysis of the relationship between crack length and stress intensity factor at crack tip of low speed and heavy load gea
The data of crack tip stress intensity factor (SIF) and crack length under different stress ratios collected through the test
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Tooth surface plastic deformation of low speed and heavy load gear with soft tooth surface
The main damage form of gear in soft tooth surface rolling mill is severe plastic deformation of gear surface, which
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Ways to improve the bearing capacity of low speed and heavy load gear with soft tooth surface
Using normalizing big gear and quenching and tempering small gear, the tooth surface after use can be extruded into mirror
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Test method of fatigue crack propagation for 42CrMo steel low speed and heavy load gear
The fatigue crack growth test of compact tensile specimen was carried out according to the national standard GB / T
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Analysis on dynamic load coefficient of meshing force of parallel planetary gears
The maximum meshing force reflects the maximum load of planetary gear. The dynamic load coefficient is the ratio of the
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Eliminating early fatigue pitting of low speed and heavy load gear with soft tooth surface
As the cement mill, mine hoist and other soft tooth surface reducer gear, the main problem is to eliminate early