【Skills】Introduction to Gear Processing Methods

Gears are a kind of transmission parts that we often see and use in our daily life. In fact, gears are also divided into many types. According to the different shapes, different transmission effects can be achieved. The following Xiao Bian will introduce to you the gear processing methods.

Gear processing method

1, milling teeth

The use of disk-shaped milling cutters or finger milling cutters is a forming process. The cross-sectional shape of the cutter teeth corresponds to the shape of the gear teeth. This method has low processing efficiency and processing accuracy and is only applicable to small batch production.

2. Shape grinding teeth

Also belongs to the forming process, because the grinding wheel is not easy to trim, use less.

3. Hobbing

Belonging to the exhibition method, its working principle is equivalent to a pair of helical gear meshing. The prototype of the gear hob is a helical gear with a large helix angle. Since the number of teeth is very small (usually the number of teeth z = 1), the teeth are long, and a small worm with a small helix angle is formed around the shaft, and then the groove is formed. The scraper has become a hob with a cutting edge and a relief angle.

Shaved teeth

Shaving is a commonly used finishing method for non-hardened tooth surfaces in mass production. Its working principle is to use the shaver gear and the gear being processed to make free-meshing movement. By means of the relative slipping between the shaver and the gear, a very fine chip is shaved from the tooth surface to improve the precision of the tooth surface. Shaved teeth can also form drum teeth to improve the tooth surface contact area.

5. Plunger

The pinion is a cutting process commonly used in the development method except for hobbing. When the teeth are inserted, the pinion cutter and the workpiece mesh with a pair of cylindrical gears. The reciprocating motion of the pinion cutter is the main motion of the pinion, and the circular motion of the pinion cutter and the workpiece in a certain proportional relationship is the feed motion of the pinion.

6. Exhibition method grinding teeth

The cutting motion of the grinding method is similar to that of hobbing. It is a kind of tooth finishing method, especially for hardened gears, which is often the only finishing method. The generatrix grinding teeth can be ground with a worm wheel, or it can be ground with a conical grinding wheel or a dish-shaped grinding wheel.

7. Pull pull teeth

The broach pull tooth is mainly used for broaching the internal gear. The final shape of the broach is the same as the complete tooth space of the gear. It is a kind of profiling method. Because the broach has high manufacturing cost, it is suitable for batch production. Production situation.

8. Stamping gear

The shape of the punch is the same as that of a complete gear or a complete tooth slot. It can punch out the external gear, and can also punch out the internal gear. It is suitable for mass production.

9. No cutting machining of gears

1) The use of metal plastic deformation or powder sintering so that the gear tooth part of the final shape or improve the quality of the tooth surface less cutting methods, divided into cold forming work pieces at room temperature processing and heating the workpiece to about 1000 °C Hot forming of two types of processing. The former include cold rolling, cold forging, blanking, etc.; the latter includes hot rolling, precision die forging, powder metallurgy.

2) No chip processing gear can improve the material utilization rate from 40 to 50% of the cutting process to 80 to 95% or more, and the productivity can also increase exponentially. However, due to the limitation of the strength of the die, the module can only be processed by a small amount. Gears or other toothed parts, while requiring high precision gears, still require the use of cutting to finish the tooth profile after forming with chipless machining.

3) Non-chip processing gears require the use of special process equipment, and the initial investment is large. Only when the production volume is large (generally more than 10,000 pieces) can the production cost be significantly reduced.

The function and structure of gears

The gear is an important transmission part of the machine. Its main function is to integrate the plane key or the spline and the shaft part, and then meshes with the other or multiple gears to transfer the power and the movement from one axis to the other. On another axis.

The gear is a rotary part. The structural characteristic is that the diameter is generally larger than the length. It is usually composed of an outer cylindrical surface (conical surface), an inner hole, a keyway (splined groove), gear teeth, tooth slots, and a stepped end surface, etc., depending on the structure. Gears often have rims, hubs, webs, orifices, spokes, and other structures.

According to the structure of different gears can be divided into solid type, web type, orifice type, spoke type and other types, if the gear and the shaft together, then form the gear shaft. According to the different tooth forms and distribution of gear teeth, there are many types of gears. Commonly used standard gears can be divided into spur gears, helical gears, and bevel gears.

Summary: The above is the contents of the gear processing method introduced by Xiao Bian for everyone. We hope that it can help you effectively. If you have any good suggestions, look forward to communicating with Xiao Bian. For more information, please pay attention to this website.

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