How to proficiently master the determination of cutting parameters during turning processing at Dongguan CNC Precision Machining Factory

When programming at Dongguan CNC Precision Machining Factory, programmers must determine the cutting amount for each process and write it into the program in the form of instructions. The cutting amount includes spindle speed, back feed, and feed rate. For different machining methods, different cutting amounts need to be selected.
1. Determination of Back Cut AP
The back feed amount ap is determined based on the stiffness of the machine tool, workpiece, and tool. If the stiffness allows, the back feed amount should be equal to the machining allowance of the workpiece as much as possible, which can reduce the number of feeds and improve productivity. When the accuracy requirements of the workpiece are high, it should be considered to leave appropriate precision turning allowance. The remaining precision turning allowance is generally smaller than that of ordinary turning, often taken as 0.2-0.5mm.
2. Determination of spindle speed
(1) When turning, the spindle speed n should be selected based on the allowable cutting speed u. and the workpiece diameter d. Follow the formula= Dn/1000 calculation. Cutting speed u: Unit: m/min, determined by the service life of the tool. When calculating, it can be selected by referring to Table 2-3 or the cutting parameter manual. For a lathe with stepwise speed changes, it is necessary to select a speed that is close to the calculated speed n according to the lathe manual.
The principle of selecting cutting parameters is to ensure the machining accuracy and surface roughness of the workpiece, fully utilize the cutting performance of the tool, ensure a reasonable tool service life, and fully utilize the machine tool performance of Dongguan CNC Precision Processing Factory to maximize productivity and reduce costs.