JB/T 8772.2-1998 JB/T 8772.2-1998 Inspection conditions for precision machining centers Part 2: Inspection of geometric accuracy of vertical machining centers JB/T8772.2-1998 Standard download decompression password: www.bzxz.net

JB/T8772.2—1998
This standard is formulated based on JB/T8771.2 "Inspection Conditions for Machining Centers Part 2: Geometric Accuracy Inspection of Vertical Machine Tools (Vertical Z Axis)" (this standard is equivalent to ISO/DIS10791-1 "Inspection Conditions for Machining Centers Part 1: Geometric Accuracy of Horizontal and Additional Spindle Head Machine Tools"), and is the same as JB/T8771.2 in terms of inspection items, inspection methods, inspection tools, etc., and the tolerance is compressed on the basis of this standard (the compression ratio is about 1.6). This standard is one of the standards in the series of inspection conditions for precision machining centers. This series of standards includes the following 13 parts, which can be used together or separately:
Part 1: Geometric accuracy inspection of horizontal and attached spindle head machine tools (horizontal Z axis); Part 2: Geometric accuracy inspection of vertical machining centers; Part 3: Geometric accuracy inspection of integral universal spindle head machine tools with horizontal main rotary axis (vertical B axis) (to be formulated); Part 4: Positioning accuracy and repeatability inspection of linear and rotary axes; Part 5: Positioning accuracy and repeatability of workpiece clamping pallets Inspection; Part 6: Inspection of feed rate, speed and interpolation accuracy (to be formulated); Part 7 Inspection of precision of finished test pieces:
Part 8: Spherical evaluation by circular inspection method (to be formulated): Part 9: Evaluation of tool change and pallet change action time (to be formulated); Part 10: Evaluation of thermal deformation (to be formulated); Part 11: Evaluation of noise emission (to be formulated); Part 12: Evaluation of vibration intensity (to be formulated); Part 13: Evaluation of safety measures (to be formulated). This standard is proposed and managed by the National Technical Committee for Standardization of Metal Cutting Machine Tools. Drafting units of this standard: Beijing Machine Tool Research Institute, Kunming Precision Machine Tool Research Institute, Ningjiang Machine Tool Factory. The main drafters of this standard: Tang Qishou, Xie Ling, Xie Hong, Li Yunxiang, Li Xiangwen. 629
1 Scope
Machinery Industry Standard of the People's Republic of China
Test conditions of precision machining centres
Part 2: Vertical machining centres
Geometric accuracy test
Test conditions of precision machining centresPart 2:Geometric tests of vertical machining centresThis standard specifies the requirements and test methods for the geometric accuracy of precision vertical machining centres. JB/T 8772.2—1998
This standard is applicable to precision vertical machining centres with three CNC axes, i.e. three linear coordinates (X, Y, Z) with a stroke of up to 2000mm or with a rotary axis.
2. Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T17421.1-1998 General Rules for Machine Tool Inspection Part 1: Geometric Accuracy of Machine Tools Under No-load or Finishing Conditions JB3051-82 Designation of Coordinates and Motion Directions of Digital Control Machine Tools 3 General Requirements
3.1 All linear dimensions in this standard are expressed in millimeters (mm). Angular deviations are mainly expressed in ratios, and in some cases, for clarity, are also expressed in micro-arans (urad) and seconds (\). The conversion relationship is as follows: 0.010/1 000-10×10-6=10 μrad~2(\)3.2 When using this standard, reference must be made to GB/T17421.1, especially the installation before machine tool inspection, the idle running temperature rise of the spindle and other moving parts, the measurement methods and the recommended accuracy of the inspection tools. 3.3 Refer to 3.1 in GB/T17421.11998 to adjust the installation level of the machine tool. The reading of the level gauge shall not exceed 0.020/1000 in both the longitudinal and transverse directions.
3.4 ​​During the inspection, the ambient temperature shall be maintained within 20℃±2℃. 3.5 The order of the inspection items in this standard does not represent the actual inspection order. In order to facilitate the installation and disassembly of the inspection tools and the inspection, the inspection can be carried out in any order. bZxz.net
3.6 When inspecting machine tools, it is not necessary to inspect all the items in this standard according to the structural characteristics. When inspection is required for acceptance purposes, the user may obtain the manufacturer's consent to select some inspection items of interest, but these items must be clearly stated when ordering the machine tool. 3.7 The inspection tools specified in this standard are only examples. Other inspection tools with the same indication and at least the same accuracy can be used. The indicator should have a resolution of 0.001mm or higher. 3.8 For simplicity, this standard only uses a schematic diagram of a machine tool with one structural type. 3.9 For machine tools with several pallets, when inspecting the inspection items related to the pallets (i.e. G15 to G22), if it is not clearly stipulated in the machine tool ordering agreement, only one pallet locked in the working position shall be inspected (i.e. the representative pallet). 3.10 When the software equipment can compensate for the deviation of certain inspection items, the inspection can be carried out with or without these compensations according to the agreement between the manufacturer and the user. When software compensation is used, it should be noted in the inspection results. 3.11 The coordinates and movement direction of the machine tool shall be in accordance with the provisions of JB3051. Figure 1 of this standard gives examples of 12 different structural types of machine tools according to the movement of machine tool components along three coordinate linear axes (i.e., X, Y, and Z), and uses numbers 01 to 12 to mark these structural types. Their classification is shown in Table 1.
Table 1 Structural type classification of vertical machining center
Column on saddle
Column saddle
Spindle box slide plate
Workbench on saddle
Workbench on saddle
Workbench saddle
Lifting table
Workbench
Lifting table
Workbench
Column saddle
Spindle box
Column on saddle
Spindle box
On beam
Spindle box slide plate
On beam
Spindle box clearing plate
Spindle box on slide plate||| tt||Worktable saddle
Worktable
Worktable saddle
Worktable on saddle
Spindle box
Spindle box
Spindle box
Spindle box
Spindle box
Spindle box
On slide plate
Spindle box
Spindle box on slide plate
Spindle box
This standard recommends the use of a short symbol to indicate the structural type of the machine tool, which consists of the following parts: the number of this standard;
The letter "V" indicating "vertical";
The numbers indicated in the corresponding box in Figure 1 and the serial number column in Table 1. 2'
Lifting platform
Lifting platform saddle
Lifting platform
Lifting platform
Example: The symbol of a vertical machining center with the spindle box moving along the Z axis, the column moving along the X axis, and the table moving along the Y axis is:
Precision machining center JB/T8772.2 model V023.13 When the measured length is different from the length specified in this standard, the specified tolerance value shall be converted according to the measurable length according to the provisions of 2.3.1.1 in GB/T17421.1--1998. When the conversion result is less than 0.003mm, it shall be calculated as 0.003mm. 631
JB/T8772.2--1998
Figure 1 Structural diagram of vertical machining center and its coordinate motion directionJB/T 8772. 2—1998
+?'1't'z'si8'z's+1't&'g
fo0'0
000 2~05 1
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.