Machining error
CNC machining error △ number plus is formed by programming error △ editing error, machine error △ machine, positioning error △ setting error, tool error △ tool and other errors.
That is, △ number plus =f (△ edit +△ machine +△ fixed +△ knife)
Among them:
1. The programming error △ is composed of the approximation error δ and the rounding error. The approximation error δ is generated in the process of approximating a non-circular curve with a straight line segment or an arc segment, as shown in Figure 1.43. The rounding error is the error caused by rounding the coordinate value to the integer pulse value during data processing. Pulse equivalent refers to the displacement of each unit pulse corresponding to the coordinate axis. For ordinary precision CNC machine tools, the general pulse equivalent value is 0.01mm; The pulse equivalent value of more precise CNC machine tools is 0.005mm or 0.001mm.
2, machine error △ Machine caused by CNC system error, feed system error and other reasons.
3, positioning error △ must be generated when the workpiece is positioned on the fixture and the fixture is positioned on the machine tool.
4, the tool error △ The tool is generated when determining the relative position of the tool and the workpiece.
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