Gear Vacuum Carburizing

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The vacuum carburizing process of carburizing treatment under reduced pressure has many advantages such as no grain boundary oxidation, no carburized abnormal layer on the surface of the workpiece, shortened heat treatment time, less exhaust gas, and energy saving. It is the most suitable for variable speed. A typical process for achieving high fatigue strength and wear resistance of tooth surfaces for box drive gears. The article starts with introducing the purpose and characteristics of vacuum carburizing technology, expounds its specific application and the method to ensure the quality of its workpieces, and points out the matters that should be paid attention to when adopting this technology.

Heat treatment is an indispensable process technology to improve the mechanical properties of steel (workpiece). However, to heat the workpiece to the proper (target) processing temperature requires a lot of energy. In the context of the whole society’s requirement to protect the global environment, “reducing energy consumption and improving production efficiency” is the eternal theme of heat treatment workers.

At the beginning of traditional heat treatment, it is divided into pre- and post-process. For any part, it is necessary to consider using the same heat treatment equipment. However, this hinders the synchronization of the front and rear processes, and creates a large inventory of workpieces, which becomes an obstacle to improving the productivity of all parts. The development trend of heat treatment in the future should be to develop towards tandem (straight-through) treatment. It is important to find the best heat treatment production line form and related technologies suitable for the parts to be processed.

How to reduce the production takt difference between the front and rear processes and shorten the carburizing time is a crucial issue when the heat treatment is connected in series (straight-through). In this regard, high-temperature carburizing is an effective method (in terms of production, vacuum carburizing can form a high temperature through vacuum insulation to shorten the processing time). Favorable conditions for carbon.

The biggest advantage of vacuum carburizing furnace in the quality of heat-treated parts is that it does not produce grain boundary oxide layer, and the strength of vacuum carburizing parts can be increased by 10% compared with gas carburizing parts (plane). Since there is no Budeau reaction such as gas carburizing (referring to the oxidation reaction of carbon, that is, the Bay-Wave reaction), the acute angle part of the vacuum carburized product is prone to over-carburization, which is affected by the setting of carburizing conditions and the shape of the product. the problem of constraints.

The key to vacuum carburizing is how to introduce appropriate carburizing gas for the surface area of ​​the product. If the amount of carburizing gas is lower than the required amount, the atmosphere in the furnace will lose uniformity, which will cause problems such as uneven local carburization of the workpiece. On the contrary, if there is too much carburizing gas, it will produce carbon black that is not conducive to carburizing ( soot), causing blockage of the exhaust system and deteriorating process performance. Therefore, the setting of the optimum amount of carburizing gas is crucial. Normally, as long as the carbon mass concentration reaches 0.6% or more, the hardness of the workpiece will be the same. will have an impact.

Equipment selection: The RVC series vacuum carburizing furnace produced by SIMUWU is a high-quality product for the vacuum heat treatment of tooling and molds. Good temperature control accuracy and temperature control uniformity ensure the effective progress of the vacuum carburizing process. SIMUWU specializes in the manufacture of vacuum furnaces, has more than ten years of relevant experience, and has a good reputation in the field of vacuum furnace manufacturing. The product line includes vacuum air quenching furnace, vacuum oil quenching furnace, vacuum brazing furnace, etc., which are widely sold in developed and developing countries.