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The Importance of Precision Measurement for CNC Machine Tools
Release time：2018-07-19
Machine tool accuracy reflects the machine’s overall technical condition, while its performance is ultimately summarized by two key factors: machining accuracy and production efficiency. Achieving high precision in workpiece dimensions requires CNC machine tools that offer high accuracy, excellent stability, and superior rigidity; accordingly, the acceptance inspection procedures for finished CNC machines are extremely stringent. The primary aspects of CNC machine‑tool accuracy verification include geometric accuracy, positioning accuracy, and cutting accuracy.
Machine tool accuracy index
I. What is the CNC Machine Tool Accuracy Index?
The accuracy index compares the actual measured values of various precision tests with the specified tolerance limits, serving as a key metric for assessing the positional deviations among machine‑tool components resulting from physical wear. The verification of CNC machine‑tool accuracy encompasses both geometric accuracy and operational accuracy assessments.
II. What data are included in the CNC machine tool accuracy index?
Geometric accuracy refers to the static positional accuracy between components of a CNC machine tool, comprehensively reflecting the geometric errors of its key parts and their assembled configuration. It primarily includes: straightness of guideways; parallelism of the worktable surface; perpendicularity between guideways and other components; radial runout and axial play of the spindle’s rotational centerline; coaxiality between the spindle center and the centers of corresponding components; and indexing accuracy of rotary tables, among others.
III. The Importance of Enhancing the Precision of CNC Machine Tools
The geometric accuracy of a machine tool directly affects the geometric accuracy of the machined parts; therefore, it is the primary criterion for evaluating machine tool precision.
The precision of machine tool equipment directly affects its quality. During manufacturing, implementing advanced process‑enhancing measures can reduce wear; therefore, whether repairing or remanufacturing based on wear conditions, surface‑hardening techniques should be employed to strengthen the components. Throughout the operation of machine tools, rigorous quality assessment, timely and precise adjustment of fits, proper lubrication, and effective sealing are essential to maintain optimal performance at all times, thereby significantly boosting production efficiency.
The CNC controller issues digital program commands to govern the motion of each moving component of the machine tool. The precision achievable by these components directly determines the accuracy of the machined parts; therefore, positioning accuracy is a critical parameter for evaluation. Yixing Intelligent is dedicated to the research and development of precision machine tools. After assembly, finished machines undergo a comprehensive series of inspections and tests, including three‑axis laser interferometer measurement, ball‑bar testing, geometric accuracy verification, spindle thermal‑rise and noise analysis, machining of MAS test parts and functional checks, as well as visual inspection. These procedures ensure that the collected data aligns with the machine’s factory‑set parameters and enable any necessary corrective adjustments. The repeatability of positioning for Yixing Intelligent’s CNC machining centers is maintained within 2 μm, guaranteeing consistent part quality even during high‑volume production.
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