JB/T 3829.1-1999 JB/T 8329.1-1999 CNC bed milling machine accuracy inspection JB/T8329.1-1999 Standard download decompression password: www.bzxz.net

JB/T8329.1—1999
This standard is a revision of ZBJ54010—88 "Precision of CNC Bed Milling Machines". During the revision, only editorial changes were made according to relevant regulations, and the technical content remained unchanged.
This standard is a part of the JB/T8329 "CNC Bed Milling Machine" series of standards, which includes the following two parts: JB/T8329.1—1999 Precision inspection of CNC bed milling machines
JB/T8329—1996 Technical conditions for CNC bed milling machines The standards that match this series of standards are: JB/T2548.1—1996 Bed milling machines
Bed milling machines, series spectrum
JB/T2548.3-1999
This standard replaces ZBJ54010—88 from the date of implementation. This standard was proposed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. This standard is under the jurisdiction of the Milling Machine Branch of the National Technical Committee for Standardization of Metal Cutting Machine Tools. The responsible drafting units of this standard are: Qinghai No. 1 Machine Tool Factory and Shanghai No. 4 Machine Tool Factory. This standard was first issued in April 1988.
1 Scope
Machinery Industry Standards of the People's Republic of China
Precision Inspection of CNC Bed Milling Machines
This standard specifies the requirements and inspection methods for the geometric accuracy and working accuracy of CNC bed milling machines. JB/T 8329.1—1999
Replaces ZBJ54010--88
This standard applies to general-purpose horizontal and vertical CNC bed milling machines of ordinary and precision grades and worktable widths of 320~~1250mm.
2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of this standard, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T10931-1989 Methods for evaluating the position accuracy of digital controlled machine tools GB/T17421.1-1998 General rules for machine tool inspection Part 1: Geometric accuracy of machine tools under no-load or finishing conditions JB/T3051-1999 Nomenclature of coordinates and motion directions of digital controlled machine tools 3 General requirements wwW.bzxz.Net
3.1 When using this standard, reference should be made to GB/T17421.1, especially the installation before accuracy inspection, the idling temperature rise of the spindle and other components, and the inspection method.
3.2 Refer to the provisions of 3.1 in GB/T17421.1-1998 to adjust the installation level of the machine tool. 3.2.1 When adjusting the installation level of a cross-table milling machine, place the table, slide, spindle box and other moving parts in the middle of the stroke, and place a level gauge in the center of the table. The readings of the level gauge in the vertical and horizontal directions shall not exceed 0.03/1000. 3.2.2 When adjusting the installation level of a column-moving type or a ram-moving type milling machine, place a circular check wrench (for V-shaped guide rails) or a bridge plate (for flat guide rails) on the bed rails, and place a level ruler on the circular check rod and bridge plate perpendicular to the bed rails. Place a level gauge on each of the circular check rod, bridge plate and level ruler: level gauge a is parallel to the guide rails, and level gauge b is perpendicular to the guide rails (see Figure 1). Adjust the guide rail level, and the readings of level gauges a and b shall not exceed 0.03/1000.
Approved by the State Bureau of Machinery Industry on May 20, 1999 292
Implemented on January 1, 2000
JB/T8329.1-1999
3.3 The order of the precision inspection items listed in this standard does not represent the actual inspection order. In order to facilitate the installation and disassembly of inspection tools and inspection, the inspection can be carried out in any order. 3.4 The working precision inspection should be carried out after the test piece is finely processed. 3.5 When the actual measured length is different from the measured length specified in this standard, the tolerance value should be converted according to the length that can be measured according to the provisions of 2.3.1.1 in GB/T17421.1-1998. When the conversion result is less than 0.005mm, it shall be calculated as 0.005mm. 3.6 The coordinates and movement direction of the machine tool are in accordance with the provisions of JB/T3051. The coordinates, movement direction and common structural types are shown in the figure. For the sake of simplicity, in the chapter on geometric accuracy inspection of this standard, only one type of structural diagram is attached for horizontal and vertical CNC bed milling machines. 3.7 According to the structural characteristics and the agreement between the user and the manufacturer, the inspection items can be increased or decreased. 293
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