Crankshaft of ion nitriding process generally go through arc, and handle other similar nitriding parts. Heating, insulation, cooling and other four stages, including the furnace charging, roughly 18 hours. Different manufacturers on the ion nitriding process is slightly different. Normal status of ion nitriding of the crankshaft
As the aging treatment of uniform temperature (about 4 hours and 2) will ensure the deformation is small, about deformation. Weifang diesel engine factory of nitride GHK Bearing Type http://www.ghk-bearings.com/ axial runout is generally not more than three. Normal status of ion nitriding of the crankshaft
Dalian diesel engine factory adopts the method of ammonia and acetone, about soft nitriding. Heat preservation time is 5 hours according to reflect ion soft nitriding is slightly bigger than nitriding deformation, according to my disposal channel plate and drive ring of dongfeng automobile factory experience, using ammonia and propane gas and ion nitriding treatment, process easier to control.
Average power has been more than 120 a, I recently developed by the high-power pulse power. Can fully meet the requirements of 150 kw to nitriding furnace. A new pulse power supply tested for its stability power supply reliability is better than the past. Due to save the current limiting resistor, that alone can power saving is about 20% and other characteristics of pulse power supply, under certain conditions, energy saving up to 50% using pulse power, arc time, oil hole is not blocked the auxiliary furnace charging time, power operation is simple, easy to control. Normal status of ion nitriding of the crankshaft
But because of the particularity of its vacuum discharge, ion nitriding and compared to the traditional nitriding process has many advantages. Brings a great disadvantages, this is the non-uniformity of temperature distribution in furnace parts. This shape on the one hand, because of parts appearance will affect the surface current density distribution, save electricity, save material, small energy consumption; (4) no environmental pollution and so on.
The surface hardness is higher, after ion nitriding of parts. The fatigue strength and wear resistance were obtained to improve.
Will greatly extend the arc duration is, if the dirty surface of the crankshaft. A factory in the past, due to the time of crankshaft cleaning not clean bowl extended to more than 12 hours. After the disposal of crankshaft many adhered on the surface of carbon black, affect the product appearance and affect the quality of the product. Cleaning process after the improvement, the arc time shorten, disposal quality is greatly improved. According to my system of dongfeng automobile diesel engine oil pump pump treatment plant on the experience of channel plate, clean easy to form a continuous compound layer thickness is relatively uniform, the opposite is not easy to form a continuous and thickness of the compound layer. And compounds in ion nitriding layer on the hardness, wear resistance and fatigue resistance performance has great contribution.
This is mainly formed by unclean appearance of carbon black in the free carbon in the form of affect the activation of parts appearance, think. Hindered the nitriding. Normal status of ion nitriding of the crankshaft