This standard specifies the requirements and inspection methods for the pre-adjustment inspection, geometric accuracy and working accuracy of CNC floor-standing milling and boring machines and floor-standing milling and boring machining centers. JB/T 8490.1-1996 Accuracy inspection of CNC floor-standing milling and boring machines and floor-standing milling and boring machining centers JB/T8490.1-1996 Standard download decompression password: www.bzxz.net

JB/T 8490.1—96
This standard is formulated with reference to ISO3070/Ⅱ "Horizontal boring and milling machine precision inspection part 2: floor-standing machine tools" of the International Organization for Standardization and the industry standard of China
Horizontal boring and milling machine precision inspection part 2: floor-standing machine tools" and the enterprise standards of advanced foreign manufacturers. This standard is proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of Wuhan Heavy Machine Tool Research Institute. The drafting units of this standard: Wuhan Heavy Machine Tool Factory, Qiqihar Second Machine Tool Factory, Wuhu Heavy Machine Tool Factory. 381
1 Scope
Machinery Industry Standards of the People's Republic of China
Precision inspection of CNC floor-standing milling machines and floor-standing milling and boring machining centers
JB/T8490.1--96
This standard specifies the requirements and inspection methods for the pre-adjustment inspection, geometric accuracy and working accuracy of CNC floor-standing milling and boring machines and floor-standing milling and boring machining centers.
This standard applies to general-purpose CNC floor-type milling and boring machines and floor-type milling and boring machining centers with boring shaft diameters of 90 to 260 mm, and general-purpose CNC floor-type boring machines and floor-type boring machining centers with boring shaft diameters of 90 to 200 mm. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB10931-89 Method for evaluating the position accuracy of digital control machine tools GB1183--80 Terms and definitions of shape and position tolerances JB2670-82 General rules for precision inspection of metal cutting machine tools 3 General requirements
3.1 Refer to 3.1 in JB2670-82 to adjust the installation level, and place a level gauge in the longitudinal and transverse directions at both ends of the bed rails. The readings of the level gauge in the longitudinal and transverse directions shall not exceed 0.030/1000. 3.2 During the precision inspection of the machine tool, the ambient temperature shall be maintained within 20℃±5℃, and shall meet the following requirements: the maximum temperature change at any point in the space occupied by the machine tool is less than 5℃/12h; the maximum temperature gradient at any point is less than 0.5℃/h; the maximum temperature difference between any two points in the space occupied by the machine tool is less than 5℃; the maximum temperature gradient is less than 0.5℃/m. 3.3 During the inspection, the actual inspection order can generally be arranged according to the requirements of the installation and disassembly inspection tools, inspection convenience, and thermal inspection items. 3.4 During the inspection of working accuracy, the inspection of the test piece shall be carried out after fine machining. 3.5 Pre-adjustment inspection G01.G02, G03 shall be inspected during the assembly process, and no re-inspection shall be carried out after the load test. 3.6 When the measured length is different from the length specified in this standard, the tolerance shall be converted according to the measurable length in accordance with the provisions of 2.3.1.1 in JB2670--82. When the conversion result is less than 0.0025mm, it shall still be calculated as 0.0025mm. 3.7 The direction parallel to the axis of the boring spindle is called the longitudinal direction, and the horizontal direction perpendicular to the longitudinal direction is called the transverse direction. 3.8 The plane passing through the axis of the boring spindle and the symmetry plane of the column guide is called the longitudinal plane, and the vertical plane passing through the axis of the boring spindle and perpendicular to the longitudinal plane is called the transverse plane.
3.9 If there is no special provision for the position of the machine tool components in the inspection method, the column and the spindle box shall be placed in the middle of their travel, the worktable shall be placed at the zero position, and the boring spindle and the ram shall be retracted during the inspection. 3.10 When checking the accuracy of the ram operation, the balance compensation device should be activated. 3.11 The movement axis codes of the machine tool are shown in Figures 1 and 2. Approved by the Ministry of Machinery Industry of the People's Republic of China on November 7, 1996 382
Implementation on January 1, 1997
JB/T 8490.1--96
Schematic diagram of machine tool movement direction
Figure 2 Schematic diagram of machine tool movement direction
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