High-speed milling generally uses high milling speeds, proper feed rates, and small radial and axial milling depths. In general, the milling speed of high-speed milling is 5 to 10 times higher than the conventional speed, and the material removal rate is more than 3 to 5 times that of conventional milling. When milling, a large amount of milling heat is carried away by the chips, so the surface temperature of the workpiece is low [2]. As the milling speed increases, the milling force decreases slightly, the surface quality increases, and the machining productivity increases. However, in the high-speed machining range, the increase in milling speed will increase the wear of the tool, as shown in Figure 1.
High-speed cutting has special process requirements than traditional cutting. In addition to high-speed cutting machines and high-speed cutting tools, it is also crucial to have the right CAM programming software. An excellent high-speed machining CAM programming system should have high calculation speed, strong interpolation function, full automatic cut inspection and processing capability, automatic tool holder and fixture interference check, feed rate optimization processing function, tool path editing Optimization function, processing residual analysis function, etc. The software that is mature at home and abroad for high-speed machining programming includes Unigraphics NX from Siemens, PowerMill from DelCAM in the UK, and Cimatron software from Israel. Among them, PowerMill of DelCAM in the UK has an outstanding advantage in 3D processing.
The NC code in high-speed cutting is not limited to different values ​​of cutting speed, depth of cut and feed. NC programmers must change all of their machining strategies to create effective, accurate, and safe toolpaths to achieve the desired surface accuracy [2]. In NC programming, we must first pay attention to the safety and effectiveness of the machining method. Secondly, we must do everything possible to ensure that the tool path is smooth and stable, which will directly affect the machining quality and the life of the machine tool spindle and other parts. Finally, we should try to make the tool load even, this will Directly affect the life of the tool. The specific requirements for high-speed cutting for NC programming are as follows.
1. 1 maintain a constant cutting load
It is important to maintain a constant cutting load during high-speed milling, which directly affects the machining quality of the workpiece and the life of the machine spindle and tools.
1. 1. 1 keep the metal removal constant
Constant metal removal during processing results in better processing quality and extended tool and machine life due to uniform cutting loads. In order to maintain constant cutting conditions, roughing is mainly used for down milling. The use of down-milling in high-speed cutting can produce less cutting heat, reduce tool load, reduce or even eliminate work hardening of the workpiece, and obtain better surface quality. In the case of uneven workpiece allowance, a constant machining strategy is usually used to ensure a constant metal removal. The method used for roughing is usually to cut a continuous plane in the Z direction, also called a contour processing strategy. This cutting follows the theory of high speed machining and uses a smaller depth of cut than conventional cutting to reduce the amount of cutting per tooth. Figure 2 is a schematic diagram of the continuous plane of cutting in the Z direction. Usually this type of machining adopts oblique or spiral cutting to obtain a smoother cutting path.
(6) Obtain better processing quality, etc. [1].
China leading manufacturers and suppliers of Car Winch For Trailer, Car Trailer Winch, Winch For Trailer,12V Trailer Winch,Electric Trailer Winch ,and we are specialized in Electric Car Trailer Winch,Winch For Trailer ,Car Trailer Winch more than 20 years.
Car Winch For Trailer,Car Trailer Winch,Winch For Trailer,12V Trailer Winch,Electric Trailer Winch
JINHUA RUNYE TECH. CO.,LTD , https://www.cnirunwinch.com