Automobile steering rack shape and processing
Automobile steering racks can be divided into straight racks and spiral racks, and can also be divided into single-toothed racks and variable-toothed racks. The width of the toothed portion is generally about 200 mm, and the machining depth is 5-10 mm. At present, the process of heat treatment is still adopted in the domestic process. The conventional processing of the rack is to grind the tooth shape on the unquenched material and then harden it. However, some foreign manufacturers have optimized the grinding process to the final process, because if the full-width tooth shape is directly ground on the solid hardened solid material, the processing quality and production efficiency can be significantly improved.
For a long time, most of the automotive industry in China has used the methods of inserting, milling or broaching to process the steering gear of the car. From the practical application of these processes, the accuracy of interpolation and milling is low, the efficiency is general, and the precision of broaching is slightly better and the efficiency is higher. However, the precision and efficiency of these machining methods are not as good as the powerful forming mill. Cutting, and the tool used is costly and the processing flexibility is poor.
In fact, the car steering rack tooth type is most suitable for machining with a powerful forming grinder. It can be said that the car steering rack is the most typical workpiece of a powerful forming grinder.
After 2004, in order to better serve the domestic automobile manufacturing industry, Hangzhou Machine Tool Group took the largest steering rack in the automotive industry as a breakthrough. Through in-depth research and testing, its MKL7150×10 CNC powerful forming grinding machine was successfully used. For the forming and grinding of car steering racks.
Grinding process of automobile steering rack tooth profile
The MKL7150×10 CNC powerful forming grinding machine is used, and the table metal diamond roller dresser or the desktop diamond disk is used to realize the forming and trimming method by the Y and Z axis linkage, and the rack tooth profile is trimmed on the grinding wheel with the maximum thickness of 240 mm. The machine tool uses a slow-feeding method to deeply form the overall tooth shape on the full width of the grinding wheel. The numerical control system of the machine tool is Siemens 840D system. In the grinding process, except the workpiece loading and unloading, the NC program can be automatically processed. The grinding work cycle is “rough grinding-dressing grinding wheel-finishingâ€, vertical total feeding 8mm, directly grinding the forming teeth, the processing time of a single piece is about 1.4 minutes.
Of course, each production plant adopts different processing techniques according to its own equipment, processing batch, production efficiency and other factors. For example, Jingzhou Long and other auto parts production plants in order to make full use of the original production equipment, while saving processing costs, but also to further improve the processing efficiency, the original rough grinding, fine grinding is divided into two knives, changed to forming in the upper grinding machine Before grinding, a top surface is milled on the workpiece by milling machine, and then the MKL7150 CNC powerful forming grinding machine is used to cut a knife. The output per machine is about 1000 pieces per day.
The development of the automotive industry has greater demand for CNC powerful forming mills
In recent years, China's automobile industry has maintained a rapid growth momentum. By 2020, China's automobile production will reach 18 million. Although China has become a big automobile country, the production of auto parts still lags behind the international level. The mainframes, varieties and levels of many auto parts products cannot meet the needs. It is necessary for equipment manufacturing enterprises to adopt advanced equipment for technical transformation. This is the machine tool industry. The development provides a rare opportunity.
Relevant experts believe that the next 10 years will be the best and last strategic opportunity for China to develop domestically produced automotive equipment. Machine tool manufacturers should firmly grasp the need to provide more CNC powerful forming grinding machines for the automotive industry and strive to expand the application areas of forming grinding machines. At the same time, grinding machines such as automobile steering racks are quite mature in technology. The manufacturing level and mature processing technology are comparable to those of similar foreign famous manufacturers. Therefore, domestic auto parts manufacturers do not have to import expensive ones. machine tool.
Automobile steering racks can be divided into straight racks and spiral racks, and can also be divided into single-toothed racks and variable-toothed racks. The width of the toothed portion is generally about 200 mm, and the machining depth is 5-10 mm. At present, the process of heat treatment is still adopted in the domestic process. The conventional processing of the rack is to grind the tooth shape on the unquenched material and then harden it. However, some foreign manufacturers have optimized the grinding process to the final process, because if the full-width tooth shape is directly ground on the solid hardened solid material, the processing quality and production efficiency can be significantly improved.
For a long time, most of the automotive industry in China has used the methods of inserting, milling or broaching to process the steering gear of the car. From the practical application of these processes, the accuracy of interpolation and milling is low, the efficiency is general, and the precision of broaching is slightly better and the efficiency is higher. However, the precision and efficiency of these machining methods are not as good as the powerful forming mill. Cutting, and the tool used is costly and the processing flexibility is poor.
In fact, the car steering rack tooth type is most suitable for machining with a powerful forming grinder. It can be said that the car steering rack is the most typical workpiece of a powerful forming grinder.
After 2004, in order to better serve the domestic automobile manufacturing industry, Hangzhou Machine Tool Group took the largest steering rack in the automotive industry as a breakthrough. Through in-depth research and testing, its MKL7150×10 CNC powerful forming grinding machine was successfully used. For the forming and grinding of car steering racks.
Grinding process of automobile steering rack tooth profile
The MKL7150×10 CNC powerful forming grinding machine is used, and the table metal diamond roller dresser or the desktop diamond disk is used to realize the forming and trimming method by the Y and Z axis linkage, and the rack tooth profile is trimmed on the grinding wheel with the maximum thickness of 240 mm. The machine tool uses a slow-feeding method to deeply form the overall tooth shape on the full width of the grinding wheel. The numerical control system of the machine tool is Siemens 840D system. In the grinding process, except the workpiece loading and unloading, the NC program can be automatically processed. The grinding work cycle is “rough grinding-dressing grinding wheel-finishingâ€, vertical total feeding 8mm, directly grinding the forming teeth, the processing time of a single piece is about 1.4 minutes.
Of course, each production plant adopts different processing techniques according to its own equipment, processing batch, production efficiency and other factors. For example, Jingzhou Long and other auto parts production plants in order to make full use of the original production equipment, while saving processing costs, but also to further improve the processing efficiency, the original rough grinding, fine grinding is divided into two knives, changed to forming in the upper grinding machine Before grinding, a top surface is milled on the workpiece by milling machine, and then the MKL7150 CNC powerful forming grinding machine is used to cut a knife. The output per machine is about 1000 pieces per day.
The development of the automotive industry has greater demand for CNC powerful forming mills
In recent years, China's automobile industry has maintained a rapid growth momentum. By 2020, China's automobile production will reach 18 million. Although China has become a big automobile country, the production of auto parts still lags behind the international level. The mainframes, varieties and levels of many auto parts products cannot meet the needs. It is necessary for equipment manufacturing enterprises to adopt advanced equipment for technical transformation. This is the machine tool industry. The development provides a rare opportunity.
Relevant experts believe that the next 10 years will be the best and last strategic opportunity for China to develop domestically produced automotive equipment. Machine tool manufacturers should firmly grasp the need to provide more CNC powerful forming grinding machines for the automotive industry and strive to expand the application areas of forming grinding machines. At the same time, grinding machines such as automobile steering racks are quite mature in technology. The manufacturing level and mature processing technology are comparable to those of similar foreign famous manufacturers. Therefore, domestic auto parts manufacturers do not have to import expensive ones. machine tool.
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