Selection principle of rough milling machining path

After the programming tool path processing model is established, the machining process should be arranged according to the shape and material precision of the part, and the appropriate tool and tool parameters and tool path should be selected. This part is the core of programming, and the software is more obvious. The difference. According to different programming objects, it can be divided into wireframe programming, surface programming and feature programming. MASTCAM8.0 uses a combination of wireframe programming and surface programming, while UG16 and PRO/ENGINEER2000 use feature programming. Although their specific use steps are very different, but the service objects are the same, they can provide a complete drilling, boring and milling programming method for the three-axis vertical milling machining center. The types of programming for drilling and boring are relatively simple, basically the same as manual programming. There are many methods of milling, which can be divided into rough milling, fine milling and partial milling according to the order of processing.

Rough milling. With the continuous improvement of alloy tools, the shape of parts is becoming more and more complicated. In order to shorten the machining cycle of parts, rough milling on CNC machine tools is an inevitable trend. Because CNC machine tools have a high-performance feed spindle system, efficient transmission system, high dynamic stiffness and small damping. Therefore, compared with ordinary milling machines, the cutting concept has been greatly different, and it is advocated to improve the cutting efficiency by means of small depth of cut and rapid feed. For example, the 540 milling cutter with three Hitachi bowl-shaped alloy rough milling cutters, the workpiece material 40Cr, and the cooling method is air-cooled. The cutting depth is 1.2mm, the rotation speed is 1300 rpm, and the cutting knife is F1300mm/min. The cutting is stable and the efficiency is high.

The principle of selection of roughing machining path: Because the cutting speed is very fast, in the selection, the first step is to ensure the uniform cutting amount, keep the cutting smooth, reduce the impact of the machine tool, reduce the lifting of the knife and the tool, and improve the service life of the tool. And try to ensure the balance is even, reduce the impact on the finishing; secondly consider the length of the tool path, reduce the phenomenon of empty knife, improve processing efficiency.

(Finish)

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