Age the technology of an ionic nitriding is improved

5mm, 550HV of exterior hardness ≥ . Because ionic nitriding and aeriform nitriding photograph are compared, have ooze fast organization of layer of fast, ooze is controlled easily, brittleness small, workpiece is out of shape gas of small, energy-saving, province is reached wait for a lot of advantage without social effects of pollution, and ionic nitriding furnace encircles kind of spare parts to tine outfit furnace also goes to the lavatory. For this, the LD of furnace of nitriding of ion of direct current source that we purchased some factory to produce one 150, effective work area is 1600mm of Φ 51300mm × . 1.

Nitrogen of existence problem ion changes furnace to buy time reach in the following in debugging a process, although age processing of postheat of nitriding of circle classics ion is out of shape,accord with a requirement, but nitriding technology asks design of one straight short of asks. Hardness of the surface after basically expressing ionic now nitrogen to change and nitriding layer deepness are extremely inhomogenous; Be the same as a hardness deviation limits to achieve 200HV left and right sides, be the same as a limits of deviation of nitriding layer deepness to achieve 0.

2mm left and right sides, the deviation limits that with furnace each tine encircles as much such, namely the tine circle hardness of below 3 in going up positions of every furnace and nitriding layer deepness are inhomogenous also, deviation limits out of tolerance. Those who age the circle installs furnace means to adopt is stow means (like the graph 2 show) , in all 3 battlementses, every battlements 3, separate with space block between gear, interval makes an appointment with 50mm distance. Curve of craft of nitriding of tine solid ion is shown 3 times like the graph. 2.

Case study and when improving measure ion nitriding, spare parts surface agrees of temperature equably everywhere is the main factor that assures nitriding quality. Turning heat as a result of ionic nitrogen is fall in the action of electric field, cathode of azotic ion bombard, spare parts surface heats to reach nitriding temperature in the meantime with realizing nitriding, this causes temperature of ionic nitriding spare parts often very inhomogenous, each place temperature differs a few degrees of very consummate Baidu, the hardness that causes nitriding layer and deepness are inhomogenous. So we from improvement hand of furnace temperature uniformity, the problem that after encircling nitriding to tine, appears undertakes analyse and be adoptinged improvement measure. (The means installing furnace of 1) workpiece has very big effect to the uniformity of temperature. Tine circle adopts a plan the means of 2 installs furnace, make tine circle relies on furnace wall around part and furnace center part, because shade is zincous span deviation different and come loose to differ hotly, bring about necessarily same the temperature of this two parts of a tine circle is different, so we are adopted in cathode dish the center puts one pile (like the graph 4 show) , every battlements the 5 means that install furnace, what assured the distance between shade positive pole so is even. Considering furnace intermediate temperature often on the high side, so interval of intermediate tine circle should compare fluctuation a few more largish, every removed distance from the top down is 30mm, 80mm, 100mm, 50mm respectively. Through installing the improvement of furnace means, improved the temperature uniformity that tine encircles. (2) changes furnace to because spare parts upside comes loose,be had in the light of nitrogen of the ion that overspread type heat up big, temperature often the characteristic of on the low side, we installed the auxiliary cathode of disc shape in furnace coping. Auxiliary cathode and spare parts rise together when the job brightness warm up. Because assist the influence of the existence of cathode and mutual heat radiation, raised the temperature of around space, reduced a hardware the heat loss due to radiation of this one place, because till the temperature with other position is identical,this makes the temperature of the place elevatory. (3) is debugged we return discovery in the process, temperature of the wall outside body of heater of ionic nitriding furnace is serious not all, mural difference in temperature has 50 ℃ left and right sides about outside. The circular cooling water that thinks via the analysis one of reasons are this body of heater road existence problem, system of water-cooling of former body of heater is in only give water with one place into water, cooling water is entered from furnace bottom, pour out of from furnace coping. In this kind cooling method falls, in furnace bottom, as a result of the ceaseless infuse of circular water, make its temperature maintains basically in 20 ℃ ; And in furnace coping, because cooling water is sent out to give the quantity of heat that come to heat ceaselessly by furnace place, cooling water temperature already achieved 70 ℃ left and right sides. Another reason is this body of heater there is a heat shield only on the design, very good effect is less than since the heat insolation to the spare parts. So we are right above all cooling water road undertook transforming, in furnace mid add one place water inlet, through adjusting the flow of two place water inlet, temperature of the wall outside achieving body of heater finally agrees basically equably, ensure furnace temperature is evener; It is new next increase _ , heat shield of a stainless steel, become double deck heat shield, can raise the temperature of ionic nitriding the chamber of a stove or furnace so, reduce arrive from workpiece the temperature gradient of furnace wall, can save electric energy not only, and also reduced workpiece to come loose everywhere the difference on hot condition, make the temperature uniformity of workpiece gets very big improvement. 3.

The effect turns issue of uniformity of furnace furnace temperature in the light of ionic nitrogen, through taking above step, after tine encircles classics ion nitriding, its are out of shape, deepness of layer of hardness, nitriding and its deviation limits all accord with a requirement, step is practical and the improvement that confirms we are adopted is effective. CNC Milling