1. Select the expansion sleeve based on the load
2. Joint surface tolerance and selection of surface roughness for the expansion sleeve
First, choose the expansion sleeve according to the load:
1. The selected expansion sleeve must meet the following requirements:
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2. When using multiple expansion sleeves in a joint, the rated load should be considered. If the rated load of one expansion sleeve is less than the required load, you can use more than two expansion sleeves in series. The total rated load will then be calculated as: Mtn = m × Mt, where:
- Mtn: Total rated load of n expansion sleeves
- m: Load factor (the m value is listed in Table A)
Table A
| Number of expansion sleeves in the knot | m Value (Z1) | m Value (Z2, Z3, Z4, Z5) |
|----------------------------------------|--------------|---------------------------|
| 1 | 1.00 | 1.0 |
| 2 | 1.56 | 1.8 |
| 3 | 1.86 | 2.7 |
| 4 | 2.03 | - |
Second, the joint surface tolerance and surface roughness:
1. The shaft and hole that are combined with the expansion sleeve should follow the tolerance bands specified in GB1800-79 "Tolerance and Fit" and GB1801 "Tolerance and Fit for Sizes up to 500mm Hole and Shaft Tolerance Bands and Fits." The recommended tolerance zones for the shaft and hole are as follows:
| Expansion Type | Expansion Sleeve Inner Diameter d (mm) | Tolerance Zone of Shaft | Tolerance Zone of Hole |
|----------------|----------------------------------------|-------------------------|------------------------|
| Z1 | - | H6 | H7 |
| | ≥38 | H8 | H8 |
| Z2 | All diameters | H7 or h8 | H7 or H8 |
| Z3 | All diameters | H8 | H8 |
| Z4 | All diameters | H9 or k9 | N9 or H9 |
| Z5 | All diameters | H8 | H8 |
2. The shaft and hole that are combined with the expansion sleeve must comply with GB1031-83 "Surface Roughness Parameters and Their Values." The recommended values for the ten-point height of the micro-unevenness (Rz) are listed in Table B:
| Expansion Type | Shaft Surface Roughness Ra (μm) | Hole Surface Roughness Ra (μm) |
|----------------------|----------------------------------|----------------------------------|
| Z1 | ≤1.6 | ≤1.6 |
| Z2, Z3, Z4, Z5, Z6 | ≤3.2 | ≤3.2 |
| Z7, Z10 | ≤3.2 | - |
| Z8, Z9, Z11, Z12, Z13, Z14 | ≤3.2 | ≤3.2 |
Proper selection of expansion sleeves ensures secure and reliable connections under various load conditions. It's important to consider both the mechanical properties and the surface finish of the components to ensure optimal performance. Always refer to the manufacturer's guidelines and standards for accurate application.
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