Method for designing cutting conditions for cutting

A method for designing cutting conditions that designs cutting conditions required for cutting a workpiece with a cutting tool, comprising:

• calculating a deflection amount of the cutting tool by using design parameters comprising a feed speed of the cutting tool, an axial direction cutting amount by the cutting tool, a radial direction cutting amount by the cutting tool, and a cutting speed of the cutting tool;
• determining whether a “chattering vibration” occurs or not in the cutting tool during the cutting based on the calculated deflection amount of the cutting tool and a predetermined threshold;
• calculating a maximum cutting thickness by the cutting tool, which is an allowed cuttable maximum thickness of the workpiece, from the feed speed of the cutting tool and the radial direction cutting amount by the cutting tool, when it is determined that the “chattering vibration” does not occur in the cutting tool;
• calculating a cutting temperature of the cutting tool from the calculated maximum cutting thickness, and the cutting speed of the cutting tool;
• determining whether a tool life of the cutting tool in the cutting is satisfied or not based on the calculated cutting temperature of the cutting tool and a predetermined threshold;
• calculating a cutting efficiency of the cutting tool in the cutting from a maximum value of the cutting speed of the cutting tool allowed in the cutting, the feed speed of the cutting tool, the axial direction cutting amount by the cutting tool, and the radial direction cutting amount by the cutting tool, when the tool life of the cutting tool is satisfied;
• and
• comparing the calculated cutting efficiency of the cutting tool with data of a cutting efficiency stored in advance and when the calculated cutting efficiency of the cutting tool is a maximum value among the data of the cutting efficiency, using, as the cutting conditions, the feed speed of the cutting tool, the axial direction cutting amount by the cutting tool, the radial direction cutting amount by the cutting tool, and the cutting speed of the cutting tool.