Gear processing technology

Abstract

The invention discloses a gear processing technology, and belongs to the field of mechanical manufacturing. According to the gear processing technology, a tooth crest basic circle P turned in the first process provides a reliable positioning and clamping replacing standard for machining after heating, and therefore a workpiece can be positioned and clamped reliably, the workpiece is convenient to clamp, and the quality of gears is more stable. A film clamping claw directly clamps the tooth crest basic circle P, compared with an original method, the clamping method has the advantages that the capability to overcome the reciprocating axial acting force is obviously enhanced, the effect of grinding wheel powder on machining quality is reduced in the positioning and clamping process, the phenomenon that because of abrasion and deformation of drum-shaped cylinders on a full pitch circle clamp, relevant machining quality is affected is thoroughly eliminated, and therefore the machining quality of the gears can be stable. Besides, the rejection rate is reduced, the clamping speed of the workpiece is increased, cost of the full pitch circle clamp is saved, and machining cost of the gears is lowered correspondingly.

Description

technical field [0001] The invention relates to the field of mechanical manufacturing, in particular to a gear processing technology. Background technique [0002] Gear machining processes are extremely common in the field of machine building. Let's take a gear in the automobile manual transmission assembly as an example to illustrate the processing technology of the gear, including the following procedures: [0003] Process 1, car one; process 2, car two; process 3, hobbing; process 4, chamfering; process 5, shaving; process 6, cleaning; process 7, pressing; process 8, welding; process 9, heat treatment ; Process 10, grinding the inner hole and end face; process 11, grinding the other end face; process 12, grinding the cone surface; process 13, polishing the cone surface; process 14, cleaning, transfer assembly. [0004] In the above process, if figure 1 Shown is a schematic diagram of the first process of the car in the prior art. The first process of the car is only to...

AI Technical Summary

Problems solved by technology

[0006] 1. There are many factors affecting the processing quality during clamping and processing, and the quality stability of the ring gear beating and the tooth direction is poor

[0007] The positioning and clamping of the gear is realized by the contact between the drum-shaped cylinder on the pitch circle fixture and the tooth surface of the gear tooth. In mass production, the operator is required to put the contact with the tooth surface It is indeed very difficult to clean each drum-shaped cylinder very clean. Therefore, sometimes the phenomenon that the drum-shaped cylinder contacts the tooth surface and pads the grinding wheel powder occurs, resulting in a large jump of the ring gear after processing, which leads to the scrapping of the workpiece; and When grinding helical gears, the tooth surfaces are all helical surfaces and most of the gears require a drum-shaped amount in the tooth direction. In addition, the drum-shaped cylinder of the full-pitch circular fixture is basically in point contact with the tooth surface, so this kind of The clamping method has poor ability to overcome axial force

During the processing, the gear is subjected to continuous reciprocating axial force, so it is more likely that the gear datum surface (H) will partially deviate from the positioning point in the circumferential direction. When this happens when the gear is processed, it will cause In addition, the drum-shaped cylinder and the tooth surface of the gear tooth are basically in point contact. During the clamping and processing process, the outer diameter of the drum-shaped cylinder of the pitch circle clamp is prone to wear or deformation, resulting in the clamping of the workpiece. When the positioning accuracy is reduced, this is also a factor affecting the quality of gear processing

[0008] 2. It is inconvenient to clean the grinding wheel powder, and the workpiece clamping speed is slow

[0009] When the workpiece is clamped during processing, it is difficult for the operator to judge whether the drum-shaped cylinder on the pitch circle fixture has been cleaned, so it is instinctive to clean it several times, so that the manual auxiliary time is relatively increased, especially the pitch circle The form of tooling where the fixture and the film jaws are connected together, it is even slower to clean the part where the drum-shaped cylinder contacts the gear teeth

[0010] 3. The manufacture of the pitch circle fixture is difficult and expensive

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