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.
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