GB/T 38758-2020 in English
VALIDPneumatic fluid power—Rules of non-ferrous metallic cylinder body
- Issued on:2020-04-28
- Implemented on:2020-11-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 38758-2020气动 有色金属缸筒技术要求》由TC3（全国液压气动标准化技术委员会）归口，TC3SC7（全国液压气动标准化技术委员会缸分会）执行，主管部门为中国机械工业联合会。
Introduction
Analysis of the key points of standard revision
| Revision dimension | ISO 6537:1982 | GB/T 38758-2020 |
|---|---|---|
| Working temperature | 100℃ | 120℃ |
| Inner diameter tolerance | H10/H11 | H9/H10/H11 |
| Surface roughness | Rmax | Rz (according to GB/T 1031) |
Analysis of core technical requirements
1. Materials and manufacturing process
The cylinder barrel should be made of brass alloy or aluminum alloy, and the stress should be eliminated by heat treatment:
- Seamless pipes need to be heat treated (5.1.1)
- Welded pipes should be heat treated before finishing (5.1.2)
2. Key performance indicators
| Parameters | Requirements | Test methods |
|---|---|---|
| Wall thickness deviation | ±10%（α>0.5mm） | Multi-point measurement of cross section (Table 1) |
| Straightness | ≤1/1000（L>1000mm） | Collimator/core rod/calculation method (8.3.1) |
| Surface roughness | Ra≤0.8μm（d>80mm） | 4-point circumference measurement (9.1.5) |
Implementation suggestions
Selection guide
According to Appendix A data:
- Aluminum alloy cylinder: H9 tolerance is preferred, and it is applicable to 1600kPa pressure when the wall thickness is ≥2mm.
- Brass alloy cylinder: H9 tolerance is applicable to d≤80mm, and H10/H11 is required for more than that.
Key points of inspection
- Inner diameter measurement must include the influence of deformation (8.1.2)
- Roughness measurement must avoid the end face by 25mm (9.1.5)
- Straightness inspection should preferably use the collimator method (8.3.1 Note)
Ordering specifications
Required to be specified (Appendix B):
Case: When ordering a φ50mm aluminum alloy cylinder, the following should be noted:
"Material: 6061-T6 aluminum alloy | Tolerance: H9 | Roughness: Ra0.4μm | Straightness ≤0.05mm/1000mm"
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