From the perspective of process safety, thread milling is a superior tapping technique. The M6 ​​thread milling head with 240mm tool flanges allows for over 5000h service life with external drill teeth (only half the number of teeth).
Manufacturers can find professional companies to cooperate in further reducing production cycle time, improving component production process safety, improving independent research and development of motor products, and cutting. For example, Komet chose to use standard or special tools such as Komet, Dihart and Jel for more demanding inside machining and machining operations from boring to threading.
Figure 1 uses external drill teeth to greatly reduce the radial force experienced by the tapping and milling head.
With a threaded milling head, the required drill holes can be made directly on the housing cover. The processing of the lateral channel air compressor casing is particularly challenging. The complex shape of the housing cover has many disturbing profiles, increasing the difficulty of machining and forcing the flange of the threaded tool to lengthen. Only shaft extensions can be used for this. If the standard tapping milling head is M62.5×D, the tool flange is 240mm.
Long flanges can cause large radial forces
The result of machining in this way is that the tool may break after machining 50 to 60 threads. The reason is that the flange is too long and the radial force acting on the tool is relatively large. The use of tapping milling is the best choice. This process saves a single piece of tool and delivers significant time savings. In addition, this technology can also be applied to modern machining centers.
Despite the difficulty in grasping the tool breakage during tapping milling, the required reliability is not achieved, but because of the significant advantages of this process, even if the tool breaks, a positive view is drawn that The tools are not left in the borehole, so there is no need to spend time cleaning the holes and no defective products.
Figure 2 uses a tapped milling head to make mounting holes in the casing of the radial fan.
Another advantage of tapping milling technology is that it allows for drilling, reaming and tapping in one process. When tapping with the traditional technology, two or three kinds of tools (such as auger, reaming or trapezoidal and thread drill) are required. When the thread milling process is used, the tool consumption can be saved and the tool change time can be saved. .
Half the number of teeth but enhanced security
From the point of view of operational safety, in order to supply fresh air when tapping the casing of the lateral passage air compressor, it is a better choice to adopt an external drilling method. Since the number of teeth is reduced by half compared to the original process, it is necessary to reduce the feed rate and increase the machining time. However, this effect is not significant relative to the operational safety achieved. As a result, the tool life can reach 5000 to 5200 threads at once. Due to the use of external drill teeth, the radial force of the tool is also greatly reduced.
In order to achieve the best use of the tapping milling head in the machining center, the TCT online CNC program software was used. In this way, Komet has also achieved the selection of the most suitable threading tools and the development of machining procedures for various occasions. The programmed procedure ensures 100% dimensional accuracy and optimum feed rate and cutting speed.
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