- The carburizing process can be used in the production of automotive parts because it can significantly improve the overall mechanical properties of metal parts. However, the traditional atmosphere carburizing process also has some drawbacks in heat treatment quality and process: it is impossible to effectively carburize the blind holes of the parts, and the internal oxidation problem is difficult to solve and affect the product quality. Therefore, carburizing in the core components of automotive transmission gears and diesel nozzles requires more advanced carburizing technology to meet its more stringent product quality requirements.
As a higher-end carburizing process on the market, vacuum carburizing has a series of advantages over carburizing speed, high surface carburizing speed, uniform carburizing layer, low energy consumption, low exhaust gas emission and high automation. In the low pressure (generally <30 mbar) vacuum state, the carburizing medium is introduced into the high temperature furnace for rapid carburization by pulse method, thereby increasing the carbon concentration on the surface of the workpiece, keeping the core of the metal workpiece with good plastic toughness and increasing the surface hardness and Wear resistance.
As a pioneer and innovator in the gas industry, Linde vacuum carburizing technology solutions can not only effectively solve the degradation of mechanical processing performance of parts caused by problems such as intergranular oxidation and alloy element depletion in the carburizing process. The problem of blind hole carburization that cannot be solved by pressurized atmospheric thermal carburizing can also effectively alleviate the internal oxidation problem. Linde vacuum carburizing technology combined with helium quenching instead of traditional oil quenching, precise control of cooling speed during quenching process, further reducing workpiece deformation and improving product quality. By increasing the carburizing temperature, the processing time can be shortened, the gas consumption and energy consumption can be reduced, the improvement of the vacuum furnace technology and the optimization of the process parameters can also eliminate the problems of carbon black damage insulation and uniformity caused by vacuum carburization.
Acetylene and propane can be used for the vacuum carburizing medium, but propane is prone to tar, and there is no hardened layer in the area where the workpiece and the tooling are in contact. Linde vacuum carburizing technology solution uses a high-purity acetylene cracking method to carburize. The ability of acetylene to obtain carbon atoms is higher than that of propane and methane, and acetylene can achieve uniform carburization at lower pressure . Less raw material gas can reduce the workload of the vacuum pump.
The gas as the main medium plays a very important role in the heat treatment of the workpiece. The purity of the gas medium determines whether the vacuum carburizing system can operate normally, especially in the carburizing step, the acetylene pulse gas supply, the instantaneous flow rate is large, the gas is Stability is high and safety is an important issue. Linde vacuum carburizing technology solutions have a large number of engineering cases and experience, can provide high-quality nitrogen, helium, high-purity acetylene, hydrogen and related gas mixture, different gas links can be different according to the amount of gas used The form of supply ensures the stability of the supply of gaseous media. Acetylene can be supplied in a manifold and fully automatic control. Nitrogen is supplied in a tank supply mode. Helium can be supplied in a tank or a tank according to the amount.In addition to supplying high purity gas supplies, gas supply control systems are also very important. The Linde gas supply control system consists of five parts: confluence, decompression, automatic switching, pressure monitoring and alarm, which fully guarantee the stable and reliable supply of acetylene. After the gas is decompressed by the gas supply system, the flow, pressure stability and safety requirements in the stable supply process of acetylene instantaneous large flow rate are met. With a diverse gas supply model and an advanced gas supply control system, Linde Vacuum Carburizing Technology provides a double guarantee for your production.
Linde vacuum carburizing technology, which is so strong, is of course a favorite. The largest SUV manufacturing company in China, in 2016, when investing in the largest and most advanced vacuum carburizing heat treatment workshop in China, it extended an olive branch to Linde, and the supporting gas project of the whole heat treatment production line was handed over to Linde design and construction. And the supply of nitrogen, hydrogen, helium and acetylene in the next few years. Due to the technological characteristics of the project, it is required to pass a large flow of high-purity acetylene into the heat treatment furnace in a short time, but the acetylene has a risk of decomposition and explosion, and the market of high-purity acetylene resources is scarce. How to achieve stable, efficient and economical realization of customers' strict process requirements under the premise of ensuring safety has become a difficult point and key point of the whole project. The Linde China team and foreign heat treatment experts have discussed many times, the entire vacuum carburizing solution fully considers the acetylene supply required by the customer's process, and solves the high-purity acetylene by introducing the imported acetylene from Germany and reinvesting with the domestic acetylene purification unit. The supply problem fully demonstrates Linde's professional strength and global resource coordination capabilities.
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