Fracture failure of gearbox shaft of ocean going freighter
The new imported ocean going freighter has been in operation for 36 days from trial run to service. During the […]
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Characteristics, causes and preventive measures of gear rim and plate crack
Feature: flange crack usually occurs at the root between two adjacent teeth. Some of the web cracks are caused by
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Graphic analysis of gear impact damage
Impact defects are generally caused by heavy loads caused by rough handling. It usually occurs at or near the root
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Comparison of spur gear and helical gear in gear reducer
Comparison of spur gear and helical gear in gear reducer 1.It is difficult and uneconomical to make and assemble a
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Vibration fault of industrial gear
When the gear has a large period fault, such as motion eccentricity and geometric eccentricity, the frequency spectrum of the
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Gear defect – accumulated false closing error of pitch out of tolerance
Main cause The maximum error of uneven rotation in each rotation of the gear hobbing machine table is too large:
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Lathe gearbox gear failure
The lathe with invalid gear is made in Japan, the surface of the gear is carburized, and it has been
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Brief introduction of gear carburizing process
In recent years, China’s industrialization process is speeding up, science and technology have been widely used in automatic production, and
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Characteristics, causes and preventive measures of gear fatigue crack
Features: the stress is repeated alternation; the crack source is usually the stress concentration on the surface of gear, such
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Graphic analysis of gear fatigue
Fatigue is usually caused by repeated and excessive load, which is often broken at or near the root of gear.
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Modeling and analysis of spur gear
This section will introduce the method of parametric creation of spur gears. The process of parametric creation of gears is
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Generation of spur gear vibration
In the process of gear transmission and meshing, there are many reasons that affect the vibration of gear, including large
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Gear defect – tooth direction error out of tolerance
Main cause The deviation between the vertical feed direction of hob and the axis direction of inner hole of gear
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Automobile gearbox gear failure
The failure gear is the first gear of the gearbox of the truck, which is made of the carburizing steel.
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Gear corrugation, arris and cold deformation
The corrugation, arris and cold deformation of gears are less, and the damage seems less. They show a surface state
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Crack analysis of 45 steel tooth blank
The 45 steel gear blank is directly roughened into a column shape with an outer diameter of φ 78mm after
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Advantages of worm gear drive
Compared with bevel gear drive, worm gear drive has the following advantages: (1) In the case of small outline size
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Modulation heat treatment process of 45 steel in gear manufacturing
Quenching and tempering is the double heat treatment of quenching and high temperature tempering, which aims to make the workpiece
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Gear defect – ring gear runout out out of tolerance
Main cause The center of the inner hole of the workpiece does not coincide with the turning center of the
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The gears produce pitting, peeling and the carburized layer is broken
The pitting point is a kind of fatigue defect, which occurs when small particles on the gear fall off from
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The computer drawing method of standard spur gear profile
In gear processing, we often use the tooth profile template when checking the tooth profile. In the past, in this
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Analysis of advantages and disadvantages of gear transmission
Gear transmission is the most common mechanical transmission in modern machines. It is a main form of transmission of machine
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Gear defect – incorrect number of teeth
Main cause 1) Incorrect adjustment of split exchange gear 2) Wrong selection of hob 3) Incorrect workpiece blank size 4)
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Specific analysis of gear wear
Wear is the removal of surface material from gears. It can be slow, like a scratch, or quick, like a
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Analysis of the advantages and disadvantages of hypoid gear and spiral bevel gear
Compared with spiral bevel gear drive, hyperbolic gear drive has the following advantages: (1) In the working process, there is
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Gear materials commonly used in gear manufacturing
Forged steel and cast steel are the common materials for gear manufacturing, followed by cast iron. In special cases, non-ferrous
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Gear defect – abnormal tooth profile
1.Edge of tooth surface Main cause The profile error of hob is too large or the tooth splitting is powerless.
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The common materials for gears
The common materials are forged steel, cast steel and cast iron. Forged steel: According to the hardness of tooth surface,
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Study on the dynamic characteristics of three ring reducer
The research on the dynamic characteristics of three ring reducer starts from the experiment. These experimental studies are mainly to
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Common faults of gears
Gear is the most commonly used mechanical transmission parts, gear failure is also a common failure of rotating equipment. According
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The common types of gears
Parallel shaft gear (cylindrical gear) (1) Spur gear: a straight cylindrical gear whose tooth ribs are parallel to the axis.
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The selection principle of gear material
There are many kinds of gear materials, and there are many factors to consider when selecting them. The following points
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Cutting method of spiral bevel gear
Spiral direction: the spiral direction of the tooth is specified as: Left-handed gear: if facing the gear tooth surface, the
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The modulation heat treatment process of 40Cr steel in gear manufacturing
Cr can increase hardenability, strength and tempering stability of steel, and has excellent mechanical properties. Cr steel shall be used
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Modulation characteristics of gear vibration signal
The common points of frequency modulation and amplitude modulation of gear vibration signal are as follows: ① The carrier frequency
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Classification of spiral bevel gears
Classification by pitch line of tooth surface: a. Arc tooth bevel gear: its teeth are cut with a circular end
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Analysis of the dynamic response of three ring reducer
With the development of the research on three ring reducer, people begin to study its elastic dynamics. Without considering the
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Advantages and disadvantages of helical gears
Advantage: The helical gear used in the helical gear reducer can be regarded as a set of cylindrical gears made
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Lubrication of gears
Oil immersion lubrication is adopted. As it is a single-stage cylindrical gear reducer, the speed V < 12m / s,
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The frequency modulation of gears
In addition to the influence on the vibration amplitude, the load fluctuation caused by gear load nonuniformity, gear pitch nonuniformity
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Gear material and its selection principle
It can be seen from the failure form of the gear teeth that when designing the gear transmission, the tooth
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Creation method of spur gear
Gear transmission is one of the most important mechanical transmission. Gear parts have the advantages of high transmission efficiency, stable
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Advantages and disadvantages of spur gears
Spur gears are among the most common types of gears used in various mechanical systems due to their simplicity and
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The amplitude modulation of gears
There are a lot of fault information in the modulation of gear vibration signal, so it is very important to
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Fire safety in heat treatment of gear production
(1) Fire protection requirements for buildings of heat treatment plant: The heat treatment workshop or working section shall be set
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The mechanical model analysis of gear
As shown in Figure 1, is the mechanical model of the gear pair, in which the gear has a certain
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Selection of gear material
(1) General gears with light load, low speed or medium speed, small impact force and low precision are made of
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Other components of gear vibration
There are not only meshing frequency and side frequency components in gear vibration signal, but also other vibration components. In
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Tempering of transmission gears
Tempering is also called flame matching. A process of metal heat treatment. Reheat the quenched workpiece to a proper temperature
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The common gear materials and heat treatment
In order to ensure the reliability of gear operation and improve its service life, gear material and its heat treatment
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Development trend analysis of gear technology and equipment
In order to meet the requirements of gear processing industry for manufacturing accuracy, production efficiency, clean production and quality improvement,
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Quenching of transmission gear
Quenching is to heat the alloy to the solution solution curve, keep it warm for a period of time, and
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Function and purpose of preoxidation in gear manufacturing
Function of preoxidation The preoxidation makes the surface of the workpiece obtain a layer of dense oxide film (3Fe +
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Common materials for gear production
The common materials for gears are 20Cr, 20CrMnTi and 18Cr2Ni4WA. (1) 20Cr It has high strength and hardenability, but poor
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Overview of gear heat treatment
As we all know, gear is the key part of mechanical equipment, which is widely used in automobile, aircraft, tank,
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Gear accuracy class, you need to know these places
There are 13 precision grades of gears, which are arranged from low to high by the numbers 0-12. Grade 0
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Analysis of the effect of laser cladding on the properties of alloy elements
Laser cladding (also known as laser surfacing) refers to the process of placing the selected coating material on the cladding
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New international standard of gear accuracy officially released in 2013
The international standard of gear accuracy is formulated by ISO Technical Committee 60 (ISO / TC60, hereinafter referred to as
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Analysis on the development trend of domestic gear mould industry
It is reported that the domestic gear mold industry is a mixed blessing. The joy is that the domestic gear
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What is the cause of gear damage
The main causes of gear damage can be roughly divided into: wear; pitting, peeling, carburizing layer fragmentation; fatigue; impact; corrugation,