The material of the spindle of the vertical machining center is 38CrMoA1A steel. The heat treatment technical requirements are: hardened layer depth ≥ 6.0mm, surface hardness ≥ 850HV, radial circular runout ≤ 0.03mm. In order to meet the above requirements, many manufacturers use medium frequency induction heating machines to heat treat spindles, the effect is good.
(1) Process flow. Forging - rough machining - quenching and tempering - fine turning - inner hole - high temperature aging - rough grinding - low temperature aging - ion nitriding - fine grinding.
(2) Heat treatment process
1) Conditioning. Quenching heating: 940℃, quenching oil. High temperature tempering: 650-690℃. Hardness is 248-280HBW.
2) High temperature aging. The heating temperature is 610℃, keep warm for 5-6.5h, and slowly cool in the furnace to below 350℃ and then come out of the furnace for air cooling.
3) Low temperature aging. The heating temperature is 160℃ and the holding time is 10h.
Many manufacturers use the above process for heat treatment. The surface hardness of the produced spindle is 950-1050HV, brittleness level 1, and radial circular runout ≤0.03mm, which meets the requirements of the work. What's even better is that this process is suitable for large-scale production, which can greatly improve your production efficiency.
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GS-ZP-1200
