Cooling System Design of Ion Nitriding and PCVD Composite Treatment Furnace

Keywords: ion nitriding furnace cooling system vacuum system Abstract. About fuction of vacuum plasma nitriding furnace cooling system, and its design and calculation of main parts, in particular control of water consumption. The cooling water system have been set into the water flowing through the four heat shield, and gradually take the heat, then the coolant out by outlet pipe. Cooling water flows through layers of insulation to varying degrees of cooling, to ensure that each level of temperature, precise calculation of water flow can only be guaranteed to ensure the maximum water savings and cooling the furnace down. This article provide the basis for vacuum furnace cooling system design in the future.

Numerical Simulation and Measurement of Velocity Distribution in a Gas Nitriding Furnace

During gas nitriding process, homogeneous velocity distribution is required to ensure uniformity of gas content and temperature fields, which is one of key factors for fine processing results. In order to understand the velocity distribution in a gas nitriding furnace, which was equipped with a stirring motor-driven fan on top, we studied different situations with several fan motor rotational speeds. The whole furnace was modeled by computational fluid dynamics software package FLUENT. The fan boundary condition and standard k-ε equation are chosen for modeling to generate better results in our case. A digital turbine anemometer is used to measurment velocities at various places inside the furnace. Good agreements were found between simulation and measurement.

Furnace Equipment and Control Systems

This chapter provides a discussion on nitriding furnace equipment and their control systems. The discussion covers the essential design criteria of the furnace, types of nitriding furnaces, insulation for the reduction of furnace heat losses, and factors influencing furnace configuration and design. It also covers the processes involved in the construction and maintenance of retort and sealing the retort to prevent ammonia leaks as well as safety precautions to be taken while using ammonia. Further, the chapter provides information on the factors for the selection of heating medium and discusses the processes involved in controlling temperature and oxygen probe and monitoring gas dissociation as well as the applications of nitriding sensors.