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Application and Selection of Vacuum Furnace
Every day, we work with products manufactured in vacuum furnaces: for example gears in automotive transmissions, special hard drill bits for industrial or DIY applications. High-strength materials would be difficult to produce without a vacuum.
Advantages of Vacuum Furnace Applications
The workpiece to be processed is heated in a vacuum furnace, at which point a low-oxygen gas atmosphere is created by means of a vacuum pump. In this way, oxidation of the workpiece can be prevented. Vacuum furnaces are used in many different industrial applications, such as vacuum sintering in the production of carbide for the tool industry or vacuum brazing in the production of vacuum switching chambers for the electrical industry. Vacuum hardening is used, for example, in high-alloy steels for gears in the automotive industry. The vacuum in the vacuum furnace acts as a protective atmosphere to prevent oxidation of the workpiece. Vacuum sintering can improve the surface quality of the workpiece. This significantly reduces the need for mechanical rework. At the same time, greater density, lower porosity, and higher strength result in optimized mechanical properties. In vacuum brazing, an increase in the strength of the braze leads to an increase in the quality of the joint. In addition, vacuum brazing ensures high process reproducibility. Vacuum hardening minimizes distortion while maintaining excellent surface quality. Another advantage of this process: the high surface quality allows for nitriding directly after hardening.
Carbide cutting tools (turning tools), sintered
Selection of Vacuum Furnace
SIMUWU Vacuum offers a large product range especially for vacuum furnace applications. Everything from vacuum pumps for evacuating furnaces to vacuum measuring equipment, from calibrating pump sets to leak detectors for leak location. SIMUWU vacuum components and valves allow you to obtain a complete set of vacuum equipment in one stop.
For processes in vacuum furnaces, it is especially important to achieve a certain pressure within a defined time. The time savings achieved by shortening the evacuation time contributes to increased economic efficiency. Additionally, excess substances such as oxygen can be removed from the drying chamber during the evacuation process.
The selection criteria for the vacuum pump include the lowest possible ultimate vacuum and high pumping speed. With these criteria it is possible to achieve the required evacuation time and maintain a constant pressure during the feeding of the process gas.
SIMUWU vacuum furnace will provide support for your complete vacuum system design. Also, the specific performance of the pump as well as losses and leaks due to piping are taken into account. Advanced calculation programs developed especially for this purpose are used in the design process.
Vacuum sintering technical requirements
The main technical requirements for vacuum pumps in vacuum sintering furnaces include pumping speed, necessary operating pressure and sufficient robustness for the debinding process. During debinding, the binder evaporates. The resulting substances must be extracted quickly and reliably. Therefore, a combination of a rotary vane pump and a Roots pump is usually used to evacuate the furnace. In this way, the required final pressure in the high vacuum range of 10-1 to 10-2 hPa can be reached quickly and reliably.
Vacuum brazing technical requirements
Vacuum brazing places high demands on the vacuum system. These challenges already arise in the medium vacuum range where the furnace needs to be evacuated with the carrier gas argon for flushing. Likewise, at this stage it is also necessary to evacuate the water vapor that is associated with the workpiece rinsing process. In addition, the solder used also poses a challenge to the vacuum pump due to the outgassing of the binder from the solder. If active solder is used, the titanium metal will outgas from it. At the same time, all hydrocarbons formed must also be evacuated. Based on this, the pumping speed in the high vacuum range (10-5 to 10-6hPa) has become an important technical requirement of the pump. The pumps used are a combination of screw pumps or rotary vane pumps and Roots pumps. Typically, oil diffusion pumps and turbomolecular pumps are used to generate high vacuum.
Vacuum quenching technical requirements
Uniform heating, penetration heating and quenching are essential elements to prevent workpiece deformation in vacuum quenching. Since heat transfer by radiation may cause irregularities in the lower temperature range, heat convection with high-purity nitrogen is required. Afterwards, the nitrogen introduced into the process must be evacuated using a vacuum pump. Therefore, a combination of a rotary vane pump and a Roots pump is usually used to evacuate the furnace. With this combination, the desired final pressure in the medium vacuum range up to 1 mbar can be reached quickly and reliably.
Gears hardened under vacuum
Vacuum furnace equipment selection: The vacuum furnace produced by SIMUWU is of high quality and reliable. SIMUWU company focuses on 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.
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