感应加热炉淬火件的淬硬层深度，一般应如何选择？

淬硬层深度一般根据淬火件的工作条件及使用中是否修磨而定。

1） 在摩擦条件下工作的零件，一般淬硬层深度应用1.5 ~2. 0mm,磨损后需修 磨的，淬硬层深度还可大些，为3〜5mm。

2） 受挤压及受压力载荷的零件淬硬层深度应为4〜5mm。

3） 冷轧辐淬硬层深度应大于10mmo

4） 受交变载荷的淬火零件，其应力不太高时，有效淬硬层深度可为零件直径的 15%;在高应力时，其有效淬硬层深度应大于直径的20%,以提高零件的疲劳强度。

5） 轴肩或圆角处的淬硬层深度一般应大于1. 5mmo

6） 受扭力的有台阶的轴，其淬硬层在全长上必须连续，否则由于台阶过渡处 淬硬层中断，轴的扭转强度会比未经感应加热炉淬火的轴的强度还要低。

感应加热炉淬火件的淬硬层深度应有上、下限范围。一般波动范围为1 ~2mm。例 如，淬硬层深度为 0.5 ~1.0mm、1.0 ~ 2. 0mm 1.0~2.5mm、2.0~4.0mm、3. 0 〜5.0mm、等。硬度亦应有上、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.