This standard specifies the requirements and inspection methods for the geometric accuracy and working accuracy of CNC coordinate machine tools. This standard is applicable to CNC coordinate testing machines with a workbench width of 200-200 000 mm. 2. Reference standard GB 10931 Evaluation method for positional accuracy of digital control machine tools JB 2670 General rules for accuracy inspection of metal cutting machine tools 3 General requirements 3.1 Adjust installation level according to JB 2670 3.1. Place the workbench in the middle of the stroke and place a level gauge in the middle of the T. workbench. The readings of the level gauge in both the longitudinal and transverse directions should not exceed 0.02/1000. During the accuracy inspection of machine tools, the ambient temperature should be maintained within 20 ± 1 ℃. When measuring positioning accuracy, the temperature fluctuation of the standard ruler should not exceed 0.2 ℃, and the temperature difference between the machine tool temperature and the standard ruler should not exceed 0.4 ℃. During inspection, the actual inspection sequence can generally be arranged according to the requirements of assembly and disassembly inspection tools, inspection convenience, and thermal inspection items. 3.4 When inspecting the working accuracy, the inspection of the specimen should be carried out after precision machining. When the measured length is different from the length specified in this standard, the tolerance should be converted according to the measurable length according to the provisions of 2.3.1.1 in JB 2670. When the conversion result is less than 0.001 mm, it is still calculated as 0.001 mm. 3.6 For machine tools with thermal compensation devices, temperature related items must be inspected under thermal compensation conditions. 3.7 The tolerance for horizontal coordinate position accuracy is based on the maximum longitudinal stroke. The direction parallel to the length of the workbench is called longitudinal (X-axis); The horizontal direction perpendicular to the longitudinal direction is called the transverse axis. The plane passing through the main axis and X axis is called the longitudinal plane, and the vertical plane passing through the main axis and perpendicular to the longitudinal plane is called the transverse plane
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