SLV type and WLV type furnaces manufactured by the principle of low vacuum transformation can overcome the shortcomings of "old three furnaces" (old box furnaces, pit furnaces and salt bath furnaces), and have some vacuum furnaces and controlled atmosphere furnaces. The utility model can realize non-oxidation heating and realize controlled atmosphere heating, and the price is low and the maintenance is easy. In addition, this technology also has the function of automatically changing the furnace pressure, so as to achieve rapid exhaust and increase the rate of carburizing and nitriding. Now introduce its characteristics as follows:
Low vacuum pressure swing heat treatment working principle
In the early 1980s, when developing high-speed steel tool oxygen-nitrogen osmosis technology, the equipment and test supporting technology (ie, low-pressure oxygen-nitrogen osmosis technology) were started with low-vacuum principle, and the workpiece was within the lower limit of the lower limit of the set vacuum. Self-circulating heating, the furnace gas repeats itself in the set time period, solves the problem of the dense production of the workpiece in the nitriding and carburizing process, the aging of the furnace gas, the uniformity of the layer, etc.; N, C atomic osmosis [2 ~ 4], on the basis of low vacuum pressure to increase the process of positive pressure transformation. The process of first performing pressure swing heating in a low vacuum range, followed by positive pressure variable pressure heating and its equipment is called a low vacuum pressure swing heat treatment technique. The furnace is heated under pressure from a low vacuum to a positive pressure, and the neutral gas is rapidly replaced with air, moisture and other oxidizing substances in the furnace, and then filled with the infiltration agent prescribed by the process to heat the workpiece in a set atmosphere, after heating If it is cooled in the furnace, it can achieve no oxidation and no decarburization quenching; if it is cooled outside the furnace after heating, the workpiece will be in contact with the air when it is taken out of the furnace, and a small amount of oxidation will be generated to achieve less oxidation-free heating.
Low vacuum pressure swing heat treatment process characteristics
The low-vacuum pressure-changing heat treatment furnace can realize an excellent heat treatment process, and has the advantages of being clean, energy-saving, less oxidation-free, densely packed, fast, and efficient.
(1) Low-vacuum pressure change in the heating process, the air in the furnace can be quickly eliminated by means of a neutral gas, and then the residual oxygen and water vapor in the furnace can be eliminated with a small amount of organic liquid or liquefied gas to achieve less oxidation-free heating of the workpiece. Excipient consumption is reduced by more than 50% compared to conventional controlled atmosphere furnaces (or protective atmosphere furnaces).
(2) With low vacuum pressure change during chemical heat treatment, the osmotic agent can be directional flow. After quickly removing the aging atmosphere around the workpiece, the fresh osmotic agent immediately spreads to the furnace, and the small holes and blind holes on the workpiece Both the wall and the pressing surface can be satisfactorily permeable, thereby achieving compact production of the workpiece.
(3) The furnace gas of a single element can be rapidly changed into a multi-element osmosis atmosphere of two types of elements (reinforced elements and lubricated elements), and finely controlled in quality and quantity (quality control is to control furnace gas) The percentage of each component, the quantity control is to control the total pressure of the furnace gas). Due to the mutual promotion of several elements at the same time, the permeation rate is accelerated and the process cycle is significantly shortened.
(4) Due to the proper increase of furnace pressure, the nitriding and carburizing time can be shortened [2~4]. The low-vacuum pressure-changing equipment can quickly adjust the furnace pressure to the highest range of percolation speed, thus shortening the process cycle and achieving fast and efficient operation. And low-cost chemical heat treatment.
(5) Low vacuum pressure transformation process, the furnace gas composition can be changed at will, and the controlled atmosphere heating can be realized.
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