感應加熱爐淬火件的淬硬層深度，一般應如何選擇？

淬硬層深度一般根據淬火件的工作條件及使用中是否修磨而定。

1） 在摩擦條件下工作的零件，一般淬硬層深度應用1.5 ~2. 0mm,磨損后需修 磨的，淬硬層深度還可大些，為3〜5mm。

2） 受擠壓及受壓力載荷的零件淬硬層深度應為4〜5mm。

3） 冷軋輻淬硬層深度應大于10mmo

4） 受交變載荷的淬火零件，其應力不太高時，有效淬硬層深度可為零件直徑的 15%;在高應力時，其有效淬硬層深度應大于直徑的20%,以提高零件的疲勞強度。

5） 軸肩或圓角處的淬硬層深度一般應大于1. 5mmo

6） 受扭力的有臺階的軸，其淬硬層在全長上必須連續，否則由于臺階過渡處 淬硬層中斷，軸的扭轉強度會比未經感應加熱爐淬火的軸的強度還要低。

感應加熱爐淬火件的淬硬層深度應有上、下限范圍。一般波動范圍為1 ~2mm。例 如，淬硬層深度為 0.5 ~1.0mm、1.0 ~ 2. 0mm 1.0~2.5mm、2.0~4.0mm、3. 0 〜5.0mm、等。硬度亦應有上、下限，如56 ~ 64HRC, 52~57HRC、、50HRC、-45HRC 等。

How to choose the depth of hardened layer of induction heating furnace quenched parts?

The depth of the hardened layer is generally determined by the working conditions of the quenched part and whether it is ground during use.

1) For parts that work under friction conditions, the depth of the hardened layer is generally 1.5 ~ 2.0 mm, and the depth of the hardened layer can be larger, 3 to 5 mm, if it needs to be ground after wear.

2) The depth of the hardened layer of the parts subjected to extrusion and pressure load should be 4~5mm.

3) The depth of the hardened layer of the cold rolled spokes should be greater than 10mmo

4) For quenched parts subjected to alternating loads, when the stress is not too high, the effective hardened layer depth can be 15% of the diameter of the part; under high stress, the effective hardened layer depth should be greater than 20% of the diameter to increase The fatigue strength of the part.

5) The depth of the hardened layer at the shoulder or fillet should generally be greater than 1.5mmo

6) For shafts with steps subjected to torsion, the hardened layer must be continuous over the entire length, otherwise the torsional strength of the shaft will be lower than that of shafts that have not been quenched by an induction heating furnace due to the interruption of the hardened layer at the transition of the steps. .

The depth of the hardened layer of the quenched parts of the induction heating furnace should have an upper and a lower limit range. The general fluctuation range is 1 ~ 2mm. For example, the depth of the hardened layer is 0.5 to 1.0 mm, 1.0 to 2.0 mm, 1.0 to 2.5 mm, 2.0 to 4.0 mm, 3.0 to 5.0 mm, and so on. The hardness should also have upper and lower limits, such as 56~64HRC, 52~57HRC, 50HRC, -45HRC, etc.