Precision die forging is a new process with less cutting process which is developed gradually on the basis of general die forging. Compared with general die forging, it can obtain good surface quality, less machining allowance and higher dimensional accuracy of forgings, thus can improve the material utilization rate, cancel or partially cancel the cutting process, can make the metal flow line along the zero companion profile reasonable distribution, improve the bearing capacity of the parts. Therefore, for the production of large quantities of small and medium-sized forgings, if you can use precision die forging forming method of production, can significantly improve productivity, reduce product costs and improve product quality. Especially for some materials are expensive and difficult to cut forgings, the technical and economic effects are more significant.
Some parts, such as synchronous gear ring of the car, not only the tooth shape is complex, and there are some blind grooves on it, cutting is very difficult, but with precision touch forging method after forming, only a small amount of cutting can be assembled and used. Therefore, precision die forging is an important new technology in the modern machine building industry, and is one of the development directions of forging technology.
According to the technical and economic analysis, the batch of parts in more than 2000 pieces, precision die forging will show its superiority, if the existing forging equipment and heating equipment can meet the requirements of precision die forging process, the batch of parts in more than 500 pieces, it can be used for precision die forging production.
With the precision forging process instead of rough cutting process, that is, precision forging parts directly for precision cutting process and get finished parts, with a large number of CNC machining equipment, the demand for billet refinement is becoming more and more urgent.
Generally is used for precision forming parts on the difficult to cut parts, while other parts still need a small amount of cutting processing. Sometimes, it is straight Sterling with sub-production of finished parts.
1) The shape of the fine forgings is more complex than the general die forgings, general die forgings can be simplified by increasing the remaining blocks to the shape, while the fine forgings are close to the shape of the parts.
2) The wall thickness, rib width and other dimensions of the fine forgings are smaller than those of the general die forgings, because the general die forgings have machining allowance, while the fine forgings generally do not leave machining allowance or leave less machining allowance.
3) The dimensional accuracy and surface quality of fine forgings are higher than those of general forgings.
Especially for some materials are expensive and difficult to cut forgings, its technical and economic effect is more significant. Some parts, such as synchronous gear ring of automobile, not only have complicated tooth shape, but also have some blind grooves on them, which are difficult to cut and process, but after forming with precision forging method, only a small amount of cutting is needed to assemble and use. Therefore, precision die forging is an important new technology in the modern machine building industry, and is one of the development directions of forging technology.
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