43) Click in the toolbar 
, the angle of view is set to an isometric view, the result is shown in Figure 19;
Figure 19
44) Click Z: 0.000 in the sub-function area and enter the Z-axis depth "-15";
45) Click back to the main function table, click C drawing, A arc, R point radius circle in the main function area, enter the center coordinate "0,0", radius "80", the result is shown in Figure 20;
Figure 20
46) Click in the toolbar 
with 
, setting the viewing angle and the composition surface as top views;
47) Click back to the main function table, click M trimming, B interrupt, 2 2 breaks, and interrupt the circle with radius "80" at the quarantine;
48) Click back to the main function table, click C drawing, U surface, E straight surface, select two semicircles, click D to execute, D to execute;
49) Click in the toolbar 
, set the angle of view to an isometric view, as shown in Figure 21;
Figure 21
2, generate tool path
50) Click back to the main menu, click T tool path, U surface machining, R rough machining, P parallel milling, enter the file name in the pop-up dialog box and save it;
51) Click A, U surface, D to execute, pop up and set the parameters according to Figure 22.
Figure 22
52) Click the roughing parameter and set the parameters as shown in Figure 23.
Figure 23
53) Click on the parallel milling parameters and set the parameters as shown in Figure 24;
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KN95 Protecive face masks adopt the GB2626-2006 standard, which stipulated the production and technical specifications of respirators .there is strict requirements on materials, structure, appearance, performance, filtration efficiency , breath resistance, test methods, product identification and packaging.
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