Step description of precision automobile gear processing process

Step description of precision automobile gear processing process:

1. Casting billet:

Hot die forging is stillCar gearParts use a wide range of blank casting processes.Over the years, cross wedge rolling technology has been widely promoted in shaft machining.This technology is particularly suitable for making blanks for more complex portal shafts. It not only has high precision, small subsequent machining allowances, but also high production efficiency.

2. Normalizing:

The main purpose is to obtain the hardness suitable for subsequent gear cutting and prepare the organization for the final heat treatment, which effectively reduces the heat treatment deformation.

The material of gear steel used is usually 20CrMnti. Normal normalizing is greatly affected by staff, equipment and environment, making it difficult to control the cooling rate and uniformity of the workpiece, resulting in poor hardness and uneven metallographic structure. Affect metal cutting and final heat treatment, making thermal deformation large and irregular, and the quality of parts cannot be controlled.

To this end, an isothermal normalizing process is adopted.Practice has proved that the use of isothermal normalizing has effectively changed the drawbacks of normal normalizing, and the product quality is stable and reliable.

3. Turning processing:

to satisfyHigh-precision gear machiningAccording to the positioning requirements, all gears are processed by CNC lathes, and the turning tools are mechanically clamped without heavy grinding, which realizes the simultaneous completion of the hole diameter, end face and outer diameter processing under one clamping.

This not only guarantees the verticality requirements of the inner hole and the end face, but also ensures that the size dispersion of the mass production of tooth blanks is small.This improves the precision of the gear blank and ensures the quality of subsequent gear processing.

In addition, the high efficiency of CNC lathe processing also greatly reduces the number of equipment, and the economy is high.

4. Gear hobbing, gear shaping:

The equipment used for processing the teeth still uses a large number of ordinary gear hobbing machines and gear shaping machines, although adjustment and maintenance are convenient, but the production efficiency is low. If a large capacity is completed, multiple machines are required to produce at the same time.

With the development of coating technology, the re-coating after sharpening of hobs and inserts is very convenient. Coated tools can significantly increase the service life, generally by more than 90%, effectively reducing the number of tool changes And sharpening time, the benefit is significant.

5. Shaving teeth:

Radial gear shaving technology is widely used in the production of high-volume automobile gears due to its high efficiency, easy realization of the modification requirements of the designed tooth profile and tooth direction.

6. Heat treatment:

Automobile gears require carburizing and quenching to ensure their good mechanical properties.For products that no longer undergo gear grinding after heating, stable and reliable heat treatment equipment is essential.

7. Grinding processing:

Mainly the heat-treated gear inner diameter, end face, shaft outer diameter and other parts are finished to improve dimensional accuracy and reduce form and position tolerances.

Gear processing adopts joint positioning and clamping, which can effectively ensure the finishing of the tooth part and the installation datum, and obtain the desired product quality.

8. Trimming:

It is completed by listening to the sound of a single pair of meshing or observing the meshing deviation on a comprehensive inspection instrument.This is the detection and cleaning of the bumps and burrs of the gears before the assembly of the transmission and drive axle gears to eliminate the abnormal noise caused by them after assembly.

The housing parts of the transmission produced by the manufacturing company include clutch, transmission housing and differential housing.The clutch housing and transmission housing are load-bearing parts, which are generally made of die-cast aluminum alloy by special die casting, with irregular and complex shapes. The general process is milling the joint surface-machining process holes and connecting holes-rough boring bearing holes-fine boring Bearing hole-cleaning-leak test.

The above description of the precision automotive gear processing process steps is for reference only. For more technical processing questions or related product requirements, you can directly consult EP Technology for free.