CNC machining process design method
1Choose a good knife route
In the CNC machining process design, the machining route should be designed with the shortest machining route in order to improve the efficiency of CNC machining. At the same time, the surface roughness and accuracy of the workpiece must be guaranteed. This can reduce the number of blocks and the time of empty tool. For example: when milling plane contour parts on a CNC milling machine, the side edge of an end mill can be used for cutting. In the operation engineering, if the milling cutter cuts along the normal direction of the outer contour of the workpiece, it will leave scratches on the surface of the workpiece. Therefore, when milling the outer contour of the workpiece, attention should be paid to cutting in or out of the workpiece. The milling cutter must be cut off along the extension line of the outer contour curve of the workpiece to ensure the smoothness of the workpiece surface . At the same time, when milling the inner contour surface of the workpiece, pay attention to the cutting-in and cutting-out method of the tool. The cutting-in and cutting-out points of the tool should choose the arc tangential direction to improve the finish and machining accuracy of the inner surface of the part. In addition, for point-controlled CNC machine tools, the shortest machining route should be selected, especially for point group parts. When the cutting route is planned, the sum of the empty travel routes should be the shortest, which can reduce the number of blocks and empty spaces. Tool time, thereby improving the efficiency of CNC machining.
2 arrange the machining procedures
In the CNC machining process, machining processes such as cutting, surface treatment, cleaning, and inspection will directly affect the machining quality of the workpiece, and even affect the machining cost of the workpiece and the production efficiency of the product. Therefore, it is important to arrange the machining procedures. It is necessary to ensure the uniformity of the benchmark, to ensure the shortest time occupied by the machine, and to ensure the minimum number of clamping times. CNC machining process designers can use CAD technology to program the machining process. CNC machining process designers can import the relevant process methods and process parameters into the programming system, and the programming system outputs the CNC machining information, and then performs machining and design, thereby shortening the product production cycle, optimizing the product design of the enterprise, and improving economic benefits.
3 Determine the cutting amount
To determine the amount of cutting, you need to pay more attention to the amount of back tool, spindle speed and feed speed, and pay attention to different machining methods to correspond to the relative cutting amount. When roughing, choose the largest possible back-cutting amount, so that the cutting edge is cut in the inner layer, to avoid uneven surface of the workpiece; choose the largest possible feed amount according to the rigidity of the part; Determine the best cutting speed within the cutting speed range allowed by the machine tool manual. In the semi-finishing and finishing of parts, the amount of back tool must be determined according to the margin after the rough machining is completed; starting from the roughness of the workpiece surface, select a smaller feed to ensure the machining accuracy; refer to Use the appropriate cutting speed for the manual about cutting parameters. Therefore, CNC Machining Process Design Institute should be familiar with the principle of cutting consumption in CNC machining, combined with on-site production conditions, select reasonable cutting consumption, in order to ensure the machining quality and machining efficiency of parts, and then give play to the advantages of CNC machine tools to improve the economic benefits of the enterprise.