Gear Processing Technology Process (7 Steps to Make It Simple)

Methods of gear processing include the forming method, which uses a forming milling cutter that matches the shape of the tooth slots exactly to cut the tooth profile, such as gear milling; and the generating method, which uses the mutual meshing motion of the tool and the passive gear to cut the tooth profile, such as gear hobbing and gear shaping. Let's take a closer look at the gear processing technology flow. Gear Processing Technology Flow 1. Forging Blank Hot die forging is still a widely used blank forging process for automotive gear components. In recent years, wedge rolling technology has been widely promoted in shaft processing. This technology is particularly suitable for producing blanks for relatively complex stepped shafts, as it not only has high precision and small machining allowance for subsequent processing but also has high production efficiency. 2. Normalizing The purpose of this process is to obtain a hardness suitable for subsequent gear cutting processing and to prepare the structure for final heat treatment, effectively reducing heat treatment deformation. The gear steel material used is usually 20CrMnTi. Normalizing is greatly affected by personnel, equipment, and environment, making it difficult to control the cooling rate and uniformity of the workpiece, resulting in large hardness dispersion and uneven metallographic structure, which directly affects metal cutting processing and final heat treatment, leading to large and irregular thermal deformation, making it impossible to control the quality of the parts. Therefore, isothermal normalizing technology is adopted. Practice has proven that isothermal normalizing effectively changes the disadvantages of general normalizing, resulting in stable and reliable product quality. 3. Turning Processing To meet the positioning requirements for high-precision gear processing, all gear blank processing is done using CNC lathes, employing mechanical clamping without regrinding the cutting tool, achieving synchronous completion of hole diameter, end face, and outer diameter processing in one clamping. This ensures the perpendicularity requirements between the inner hole and the end face, while also ensuring small size dispersion in large batch production of gear blanks. This improves the precision of the gear blanks and ensures the processing quality of subsequent gears. Additionally, the high efficiency of CNC lathe processing significantly reduces the number of equipment needed, making it economically favorable. 4. Hobbing and Shaping The equipment used for processing the teeth still largely employs ordinary hobbing machines and shaping machines. Although they are easy to adjust and maintain, their production efficiency is relatively low, and if large production capacity is required, multiple machines need to operate simultaneously. With the development of coating technology, it has become very convenient to re-coat hobs and shaper tools after grinding. Coated tools can significantly improve service life, generally increasing it by over 90%, effectively reducing the frequency of tool changes and grinding time, resulting in significant benefits. 5. Skiving Radial skiving technology is widely used in large-scale automotive gear production due to its high efficiency and ease of achieving design requirements for tooth shape and orientation. Since the company purchased specialized radial skiving machines from an Italian company in 1995, this technology has been applied maturely, with stable and reliable processing quality. 6. Heat Treatment Automotive gears require carburizing and quenching to ensure good mechanical properties. For products that do not undergo further grinding after heat treatment, stable and reliable heat treatment equipment is essential. The company has introduced a continuous carburizing and quenching production line from Germany's Linde Company, achieving satisfactory heat treatment results. 7. Grinding Processing This mainly involves precision machining of the inner hole, end face, and outer diameter of the gear after heat treatment to improve dimensional accuracy and reduce geometric tolerances. Source: Internet. If there are any issues, please contact us!

Process flow, processing, gears