1. Fault in CNC precision machining principle

The fundamental errors in CNC precision machining are caused by approximate machining movements or approximate tool contours. Because there are errors in the processing principle, it is called processing principle errors. As long as the principle error is within the acceptable range, this processing method is still feasible.

2. A few errors in the machine tool

Machine manufacturing errors, device errors, and wear during use directly affect the machining accuracy of workpieces. Among them, there are machine tool spindle rotary motion, machine tool guide rail linear motion, and machine tool transmission chain errors.

3. Manufacturing errors and wear of cutting tools

Manufacturing errors, device errors, wear and tear during the machining process of CNC machine tools can all affect the machining accuracy of workpieces. During the cutting process, there is intense conflict between the cutting edge, cutting surface, workpiece, and chips, resulting in tool wear. When the tool wear reaches a certain value, the surface roughness of the workpiece increases, and the color and shape of the chips change, accompanied by oscillation. Tool wear will directly affect cutting productivity, machining quality, and cost.

4. Fixture error

The fixture errors in CNC precision machining include positioning errors, clamping errors, fixture device errors, and tool alignment errors. These errors are mainly related to the precision of fixture manufacturing and installation.

The precision of CNC precision machining is not perfect, as long as errors are controlled within a certain range, it is insignificant. Tool manufacturing errors and wear and tear.

5. Positioning error

Positioning errors mainly include reference misalignment errors and inaccurate positioning sub fabrication errors. When machining workpieces on machine tools, it is necessary to select several elements on the workpiece as the positioning reference for machining. If the selected positioning benchmark and design benchmark are used (the benchmark is used to determine the external dimensions and orientation on the part drawing). If misalignment occurs, it will result in a reference misalignment error. The workpiece positioning surface and fixture positioning components together form a positioning pair. The inaccurate positioning direction caused by large displacement of the workpiece due to the cooperation gap between the positioning pairs is called positioning. Inaccurate errors in production.

6. Adjust errors

In every process of mechanical processing, the process system is always adjusted in one way or another. Because adjustments cannot be accurate, adjustment errors have occurred. In the process system, the mutual orientation accuracy between the workpiece and the tool on the machine tool is ensured by adjusting the machine tool, tool, fixture or workpiece. When the original accuracy of machine tools, cutting tools, fixtures, and workpiece blanks meets the process requirements without considering dynamic factors, adjustment errors play a decisive role in machining errors.

7. Measurement error

When measuring CNC precision parts during the machining process or after CNC Machining, the measurement accuracy is directly affected by the measurement method, tool accuracy, workpiece, and subjective and objective factors.