XNUMX. Discuss the gear quenching process and then discuss the residual stress of the surface layer after carburizing and quenching in the gear machining process.Regardless of carburizing quenching or non-carburizing normal overall quenching, the surface layer is in direct contact with the cooling medium to cool faster than the core, so the surface thermal stress direction is generally negative compressive stress, while the structure stress direction may increase after surface carburization The surface carbon content is reduced, and the martensite starting temperature is lowered, so that the martensite transformation occurs in the core before the surface, which affects the direction of surface stress.Second, the negative pressure stress of the gear The infiltration of carbon or nitrogen atoms in the material of the gear makes the surface of the part appear...

If you want to reduce gear transmission noise, the prerequisite is a detailed analysis of the type and mechanism of noise. 1. Category Generally, gear transmission noise can be divided into two categories, one is self-sounding noise, and the other is acceleration noise.Self-humming noise refers to the sound radiation caused by the vibration of all parts due to the influence of the meshing force when the gear teeth are meshed.Acceleration noise refers to the process of gear tooth meshing, because after it is subjected to a great impact, it will not only cause acceleration, but also disturb other different media, resulting in sound...

When the involute gear is driven, the contact points of the teeth in the gear will always move sequentially on the meshing line.A series of studies have shown that when the gear is driven, the position of the meshing point is constantly changing, so the speed generated by the sliding between the tooth profiles on the meshing line will be different.The starting point and end point of the meshing are the largest, and the sliding speed of the pitch circle tangent point is zero.In addition, the magnitude and direction of the sliding speed will also change.For these reasons, the friction force will definitely change, resulting in pitch impulse.There is a direct and close relationship between the sliding speed of friction and the pitch line impulse.Therefore, as the gear transmission power increases,...

Frequently Asked Questions: What is an involute?Answer: Involute: Wrap a thread with a pencil on one end around the outer circumference of the cylinder, and then gradually release the thread while the thread is tight.At this time, the curve drawn by the pencil is the involute curve.The outer circumference of the cylinder is called the base circle.

The five advantages of involute gears are explained below for reference.

Frequently Asked Questions: What is the assembly distance of the gear, and what is the tolerance for its size?Answer: Assembly distance: the axial distance from the conical vertex of the bevel gear to the positioning surface (installation reference surface).In English, the assembly distance is called Locating distance (Mounting distance).The assembly distance is an important dimension that affects gear tooth contact and backlash.In order to obtain proper backlash and gear tooth contact, the tolerance should be as close as possible to zero.For the tolerance of the reference size (allowable difference is close to 0), js0~js7 are recommended.If you have more questions or related processing requirements, please consult EP free of charge.