This standard specifies the requirements and inspection methods for the geometric accuracy of vertical machining centers. This standard is applicable to general-purpose ordinary precision vertical machining centers that basically have three CNC axes, that is, three linear axes (X, Y, Z) with a stroke of up to 2000 mm or with a rotary axis. JB/T 8771.2-1998 Inspection conditions for machining centers Part 2: Inspection of geometric accuracy of vertical machining centers JB/T8771.2-1998 standard download decompression password: www.bzxz.net

JB/T 8771. 2—1998
This standard is formulated based on JB/T8771.1-1998 "Geometrical accuracy inspection of horizontal and additional spindle head machine tools (horizontal Z axis)", which is equivalent to the draft international standard ISO/DIS10791-1 "Inspection conditions for machining centers Part 1: Geometrical accuracy inspection of horizontal and additional spindle head machine tools (horizontal Z axis)". This standard is one of the series of standards for inspection conditions for machining centers. This series of standards includes the following 13 parts, which can be used simultaneously or separately:
Part 1: Geometrical accuracy inspection of horizontal and additional spindle head machine tools (horizontal Z axis) Part 2: Geometrical accuracy inspection of vertical machining centers Part 3: Geometrical 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 inspection of workpiece holding pallets Part 6: Test of feed rate, speed and interpolation accuracy (to be formulated) Part 7: Test of precision of finished test piece
Part 8: Evaluation of spherical shape by circular test 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. The drafting units of this standard are: Beijing Machine Tool Research Institute, Beijing Milling Machine Research Institute, Shenyang Boring and Drilling Machine Research Institute, Qinghai First Machine Tool Factory. The main drafters of this standard are: Zheng Xuemei, Fei Zaosheng, Liang Kunhong, Li Xiangwen. 535
1 Scope
Machinery Industry Standard of the People's Republic of China
Test conditions of machining centres
Part 2: Vertical machining centres
Geometric accuracy test
Test conditions of machining centresPart 2:Geometric tests for machineswith vertical spindle
This standard specifies the requirements and test methods for the geometric accuracy of vertical machining centres. JB/T8771.2—1998
This standard is applicable to general-purpose ordinary precision vertical machining centres with three CNC axes, i.e. three linear axes (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 by 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. 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-radians (prad) and seconds (\). The conversion relationship is as follows: 0.010/1000=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 recommended accuracy of the measurement method and inspection tools. 3.3 The order of geometric accuracy inspection items is arranged according to a group of similar inspections or according to machine tool components, so it 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. 3.4 When inspecting a machine tool, it is not necessary to inspect all the items in this standard due to the structural characteristics. When inspection is required for acceptance purposes: the user may obtain the manufacturer's agreement to select some inspection items of interest, but these inspection items must be clearly stated when ordering the machine tool. 3.5 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. 3.6 For the sake of simplicity, this standard only includes a schematic diagram of a machine tool of one structural type. 3.7 For machine tools with several pallets, when inspecting items related to the inherent geometric characteristics of the pallets or their state relative to the machine axis (G15~~G22), only any pallet locked in the working position shall be inspected, unless otherwise specified in the written agreement. 3.8 When the software device can compensate for certain geometric deviations, the relevant inspection items can be inspected with or without these compensations according to the agreement between the manufacturer and the user. When software compensation is used, it should be indicated in the test results. Approved by the State Bureau of Machinery Industry on July 17, 1998 536
Implemented on December 1, 1998
JB/T 8771. 2—1998
3.9 Coordinates and movement directions of machine tools According to the provisions of JB3051, Figure 1 contains twelve different structural types of vertical machining centers showing the movement of components along the three-coordinate linear axis and examples of their coordinates and movement directions. These structural types are marked with numbers from 01 to 12, and their classification is shown in Table 1.
3.10 A mark is provided to identify the structural type of the machining center using a short code. This mark consists of the following parts: the main mark number,
the letter V representing "vertical"
the number indicated in the corresponding box of Figure 1 and the number indicated in the serial number column of Table 1. Example: The symbol of a vertical machining center in which the spindle box moves along the Z axis, the column moves along the X axis, and the worktable moves along the Y axis is: Machining center JB/T8771.2 model V02
3.11 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 of GB/T17421.11998. When the conversion result is less than 0.005mm, it shall still be calculated as 0.005mm. Figure 1 Schematic diagram of the structure of a vertical machining center and its coordinates and movement direction 537
On the saddle
Column saddlewwW.bzxz.Net
Spindle box
JB/T 8771.2—1998
Vertical machining center structural type classification
On the saddle
Workbench
On the saddle
Workbench
Workbench
Lifting table
Workbench
Lifting table
Workbench
Spindle box
On the saddle
Spindle box
On the crossbeam
Spindle box slide plate
On the crossbeam
Spindle box slide plate
On the slide plate
Spindle box
Workbench
Workbench
Workbench
On saddle
Workbench
Spindle box
Spindle box
Spindle box
Spindle box
Spindle box
On slide
Spindle box
On slide
Spindle box
Lifting table
Lifting table
Lifting table
JB/T 8771. 2-1998
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