This standard specifies the requirements and inspection methods for the pre-adjustment inspection, geometric accuracy and working accuracy of CNC profile fixed beam gantry boring and milling machines. This standard is applicable to CNC profile fixed beam gantry boring and milling machines with a worktable width of 1000~2500mm. JB/T 8330.1-1996 Accuracy of CNC profile fixed beam gantry boring and milling machines JB/T8330.1-1996 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
CNC Profile Fixed Beam Gantry Boring and Milling Machine
1 Subject Content and Scope of Application
JB/T 8330.1—96
This standard specifies the requirements and inspection methods for the pre-adjustment inspection, geometric accuracy and working accuracy of CNC profile fixed beam gantry boring and milling machines. This standard is applicable to CNC profile fixed beam gantry boring and milling machines with a worktable width of 1000~2500mm. 2 Reference Standards
GB1183 Shape and Position Tolerance
Terms and Definitions
GB1958 Shape and Position Tolerance
Testing Regulations
GB10931 Method for Assessing Position Accuracy of Digital Control Machine Tools JB2670 General Rules for Accuracy Inspection of Metal Cutting Machine Tools 3 General Requirements
3.1 Adjust the installation level in accordance with Article 3.1 of JB2670. Check the installation level along the entire length of the bed rail. Place a bridge plate on each flat rail, and place a level ruler perpendicular to the rail on the two bridge plates. Place a level gauge on the bridge plate and the level gauge in the longitudinal and transverse directions (see Figure 1). The readings of the level gauge in the longitudinal and transverse directions shall not exceed 0.03/1000. 3.2 When inspecting the accuracy of the machine tool, the ambient temperature should be kept within 15-25°C. The maximum temperature change at any point in the space occupied by the machine tool is less than 5°C/12h; the maximum temperature gradient at any point is less than 0.5°C/h; the maximum temperature difference between any two points in the space occupied by the machine tool is less than 5°C, and the maximum temperature gradient is less than 0.5°C/m. Figure 1
3.3 During the inspection, the actual inspection order can generally be arranged according to the requirements of the assembly and disassembly inspection tools, inspection convenience and thermal inspection items. 3.4 When inspecting the working accuracy, the inspection of the test piece should be carried out after fine machining. 3.5 Installation level and pre-adjustment inspection G01, G02, G03 are only inspected during assembly 3.6 When the measured length is different from the length specified in this standard, the tolerance should be converted according to the measurable length in accordance with the provisions of Article 2.3.1.1 of JB2670. When the conversion result is less than 0.005mm, it is still calculated as 0.005mm. Approved by the Ministry of Machinery Industry of the People's Republic of China on April 11, 1996 312
Implementation on October 1, 1996
JB/T8330.1—96
3.7 The direction parallel to the bed rail is called the longitudinal direction, and the horizontal direction perpendicular to the longitudinal direction is called the transverse direction. 3.8 The vertical plane parallel to the longitudinal direction is called the longitudinal plane, and the vertical plane perpendicular to the longitudinal plane is called the transverse plane. 3.9 The plane determined by the longitudinal movement of the worktable and the transverse movement of the vertical boring and milling head is called the reference plane. 3.10 The code for the direction of motion of the machine tool coordinates is shown in Figure 2. Figure 2
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