In the traditional processing method, turning is only used for roughing before quenching, and in the finishing of parts, the grinding machine is generally selected to achieve a higher required surface finish. Even in the 1980s and 1990s, the finishing process after quenching can only use the grinding process, and the turning can only process the workpiece with the hardness not more than HRC55, which indirectly causes the grinding machine to have a monopoly position on the finishing of the parts. As a result, the grinding machine is not only expensive, but also has high production costs and is relatively slow. Therefore, over the years, people have been researching and improving, hoping to find better processing methods.
Under this requirement, in recent years, with the improvement of the rigidity of high-hardness tool materials, coating technology and machine structure, such as the use of CBN tools, ceramic tools on the new lathe or on the more rigid turning center Steel turning, etc., has achieved very good processing results, and its processing quality can reach the level of fine grinding. This is the "car-grinding" technology that is very popular and practical in foreign countries in recent years, that is, hard turning. At present, the hardness limit of turning can reach HRC68. In developed countries such as Germany, hard-car technology has been widely used, and hard turning is being popularized as an economical and practical method to replace grinding.
As a well-known German company, EMAG Group has been pursuing innovation and efficiency in the processing of disk parts such as gears, hubs and steering knuckles. Its inverted turning center is not only unique in the world, but also in the process of car grinding. Research and rumors are second to none. The EMAG VL3, VL5 and VSC series can be used for continuous cutting and interrupted cutting. It has been widely recognized and widely used by many customers at home and abroad.
EMA series inverted turning center VL series, small footprint, good stability and excellent cost performance
VL, VSC series hard-working gears, surface roughness Ra<0.6
1 High efficiency and good surface finish
Compared with grinding, the car grinding technology has higher processing efficiency than grinding. In hard turning, large cutting depths and high workpiece rotation speeds are often used. The metal removal rate is usually 3 to 4 times that of grinding, and the energy consumed is only 1/5 of the grinding. In addition, in the grinding machine processing, the replacement of the grinding wheel usually takes 30 minutes or more, and the tool change of the EMAG VL series and VSC series lathe can be completed in an instant, and there is no need to correct the cutting contour of the grinding wheel, and it is not necessary to replace and correct the grinding wheel. The loss of production time, the utilization rate of the machine tool is high, and the efficiency can be as fast as three times of the grinding process.
At relatively high feed rates, grinding results in a good surface finish, but with the car grinding technology you can achieve the same or similar surface finish with a higher metal removal rate, while in hard turning, the production Most of the heat is taken away by cutting, without surface burns and cracks like grinding, with excellent surface quality and surface finish.
2 Automatic loading and unloading system, saving time and money
In EMAG's car grinding process, each machine tool is a production unit, and the workpiece is placed in a prismatic frame and sent to the loading and unloading station by an endless conveyor belt. The loading and unloading station is located at the rear of the processing area, and the finished parts can be taken out in front of the machine tool and placed into the blank at any time, saving labor time. In addition, when the workpiece type is changed, it is only necessary to change the corresponding variables of the NC subroutine, and then input the data into the control system. Therefore, the NC numerical control conveyor belt does not have to be replaced, and the process is simpler.
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