What is the main performance of gear processing?

What is the main performance of gear processing?

In principle, gear machining can be divided into two methods: profiling method and generating method, also known as generating method.

1. The generating method is also called the generating method, which uses the gear meshing principle to cut the gear profile. This method has high precision and is the main method of gear tooth machining at present. There are many kinds of model methods, such as gear shaping, gear hobbing, gear shaving, gear grinding, etc., which are commonly used in gear shaping and gear hobbing, and gear shaving and gear grinding are used in occasions with high requirements for precision and finish.

2. Gear processing belongs to the category of mechanical processing. For gears with different accuracy requirements, the machining process is different. Only high-precision gears can be finished. The purpose of finishing is to improve the accuracy of gears.

3. Generation method is a commonly used method in gear machining at present. It is processed according to the principle of conjugate curve when a pair of gears mesh and drive. When machining, it is like a pair of interlocking gears. The cutter cuts the gear blank into involute gear. The common ones are gear hobbing and gear shaping.

What are the main manifestations of gear processing failure?

Tooth surface damage: for open transmission gear or closed transmission gear with dirty grease, due to the relative drag between the tooth surfaces, some hard abrasive particles enter the friction surface, which changes the tooth profile and increases the backlash, resulting in the transmission gear being too thin, resulting in tooth fracture. Under normal conditions, the abrasive particles on the tooth surface will be damaged only when the abrasive particles in the lubricating grease are mixed.

Tooth surface plywood: for high-speed light-load transmission gear transmission gears, the tooth surface temperature is too high due to the large sliding friction between the tooth surfaces and the large directional acceleration. Once the wetting standard is not good, the oil slick between the tooth surfaces will subside, prompting the stainless steel passivation of the two transmission gears to contact immediately and then bond with each other. When the two tooth surfaces are in relative speed again, the hard tooth surface will tear off part of the raw materials on the soft tooth surface along the dragging direction to produce grooves.

Fatigue pitting: when two transmission gears are in contact with each other, the interaction force and recoil force between the tooth surfaces will cause the contact stress of the two working surfaces. Due to the change of the tooth contact point, the transmission gear moves regularly, and the contact stress of gear processing changes according to the pulsating cycle system. For a long time, under the action of this alternating contact stress, small cracks will appear at the knife-edge of the tooth surface. With the passage of time, this kind of crack slowly expands on the surface. After the crack forms a ring, the surface of the transmission gear will cause the total area to fall off slightly, resulting in some fatigue shallow pits.