GB/T 34880.2-2017 in English
SUPERSEDEDTest conditions for the 5-axis simultaneous machining centers-Part 2:Testing of the accuracy for vertical machine
- Issued on:2017-11-01
- Implemented on:2018-05-01
- File Format:PDF
- Delivery:Via email within 5 business days
$796.00
《GB/T 34880.2-2017五轴联动加工中心检验条件 第2部分：立式机床精度检验》由TC22（全国金属切削机床标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
Analysis of the core content of the standard
| Inspection type | Key items | Tolerance requirements | Measuring tools |
|---|---|---|---|
| Geometric accuracy | Linear motion straightness | 0.010-0.025mm/full length | Square ruler/laser interferometer |
| Spindle radial runout | 0.005mm | Short inspection stick | |
| Rotation axis verticality | 0.015/300mm | Rectangular square | |
| Positioning accuracy | Bidirectional repeat positioning | 0.012-0.020mm | Laser interferometer |
| Working accuracy | Frustum roundness | 0.08mm | Three-coordinate machine |
Key technical requirements
Key points for geometric accuracy inspection
The standard specifies 21 geometric accuracy inspection items for vertical five-axis machining center, among which:
- Linear motion straightness tolerance is set according to the stroke segment, such as 0.010mm when X≤500mm
- The spindle end face runout requirement is ≤0.010mm, and the tapered hole radial runout is ≤0.005mm
- The verticality of the rotating axis is inspected by a rectangular ruler, with a tolerance of 0.015/300mm
Positioning accuracy detection specification
According to GB/T 17421.2-2016 standard:
- Linear axis bidirectional repeat positioning accuracy: 0.012mm (≤500mm stroke)
- Rotary axis positioning accuracy: 28 arc seconds (360° range)
- Laser interferometer or equivalent accuracy equipment is required
Typical structure inspection differences
The standard covers 11 machine tool structure types, the main differences are:
| Structure type | Features | Special inspection items |
|---|---|---|
| Swinging spindle head type | B-axis swing | AG1-AG7 in Appendix A |
| Rotary swing type | C+A axis compound | BG1-BG6 in Appendix B |
| Tiltable worktable | A-axis rotation | G21-G22 |
Implementation suggestions
- Preheating for 24 hours before acceptance
- When using M1 type test piece for working accuracy inspection, the cutting parameters need to be controlled:
- Feed rate for cast iron is 50mm/min
- Radial cutting depth is 0.2mm
- Software compensation function must be clearly marked in the inspection report
Analysis of standard evolution
Main improvements compared with the old version of the standard:
- Special inspection for swing spindle head structure is added
- Introduction of frustum cone specimen (M3) to inspect five-axis linkage performance
- Clear minimum tolerance conversion rules (not less than 0.005mm)
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