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軸承安裝加熱溫度
計算所需的加熱溫度，以膨脹軸承內圈，用於過盈配合安裝。輸入孔徑、過盈量及所需游隙。
結果
熱膨脹原理
當軸承加熱時，其內圈會因鋼材的熱膨脹而膨脹。孔徑的增加量與溫升及原始直徑成正比：
- α — 軸承鋼材的熱膨脹係數 ≈ 12.5 × 10⁻⁶ /°C
- d — 軸承孔徑 (mm)
- ΔT — 高於環境溫度的溫升 (°C)
所需溫升
所需的總直徑膨脹量為軸過盈量與便於滑動的額外游隙之和：
溫度限制
| 軸承類型 | 最高溫度 | 原因 |
|---|---|---|
| 標準（開放式） | 120 °C (250 °F) | 避免軸承鋼材發生冶金變化 |
| 密封 / 帶護罩（2RS, 2Z） | 80 °C (175 °F) | 防止潤滑脂降解及密封件損壞 |
實務範例
已知： d = 60 mm，過盈 = 30 μm，游隙 = 15 μm，T環境 = 20 °C
所需總膨脹量 = 30 + 15 = 45 μm = 0.045 mm
ΔT = 0.045 / (12.5 × 10⁻⁶ × 60) = 0.045 / 0.00075 = 60.0 °C
T加熱 = 20 + 60 = 80 °C ✓（在開放式軸承的允許範圍內）
💡 提示： 請務必使用經校準的溫度測量。具有內建溫度控制的感應加熱器是軸承安裝最可靠的方法。
Heating the bearing expands the inner ring bore, allowing it to slide easily over the shaft for an interference fit. This avoids the need for mechanical force (hammering, pressing), which can damage the bearing raceways and rolling elements.
Thermal mounting is the recommended method for medium and large bearings (bore > 50 mm) and for any bearing with significant interference.
Temperature limits depend on bearing type:
- Standard open bearings: Max 120 °C (250 °F) — higher temperatures risk metallurgical changes in the bearing steel that reduce hardness and fatigue life
- Sealed/shielded bearings (2RS, 2Z): Max 80 °C (175 °F) — grease degrades and seals may deform at higher temperatures
Heating duration depends on the method and bearing size:
- Induction heater: 2–10 minutes (fastest, most controlled)
- Oil bath: 20–40 minutes (limited to ~100 °C with mineral oil)
- Oven/furnace: 30–60 minutes depending on size
The bearing should be heated uniformly. Avoid localized hot spots that could cause distortion.
Common heating methods:
- Induction heaters — fastest, most precise, recommended for production. Demagnetize after heating.
- Electric hot plates — simple, suitable for small bearings
- Oil baths — uniform heating, max ~100 °C with mineral oil
- Ovens/furnaces — good for batch heating, slow but uniform
Never use open flames — they cause uneven heating and localized overheating.
Sealed (2RS) or shielded (2Z) bearings are pre-filled with grease and must not be heated above 80 °C. At higher temperatures:
- Grease properties degrade permanently
- Rubber seals may deform and lose sealing effectiveness
- Grease may leak out of the bearing
If the required heating temperature exceeds 80 °C, consider using an open bearing with a separate sealing arrangement, or reduce the interference fit.
本頁所述的操作流程由 Vibromera 團隊使用 Balanset-1A（一款用於現場轉子平衡的便攜式雙通道動平衡儀及振動分析儀）開發並經過實地測試。
專業現場動平衡儀器與軟體。實現現場 ISO 合規。已應用於 50 多個國家。
