1. Issues related to heating uniformity
For large workpieces, which have large volume and mass, whether the hood type resistance furnace can ensure uniform heating of the entire workpiece is the key. For example, during the heating process, are the hot air flow circulation path and intensity in the furnace sufficient to allow heat to penetrate evenly into all parts of the large workpiece? Especially for large workpieces with complex shapes, different thicknesses and structures, will there be local overheating or overcooling? This is not only related to the heat treatment quality of the workpiece, such as the uniformity of performance indicators such as hardness and toughness, but may also affect the dimensional stability and subsequent processing accuracy of the workpiece. Poor heating uniformity may cause stress concentration inside the workpiece, increase the risk of deformation or even cracking.
2. Temperature control accuracy and process matching issues
How accurate is the temperature control system of the hood type resistance furnace during the heat treatment of large workpieces? The heat treatment of large workpieces often requires strict adherence to a specific temperature-time process curve. During the long heating and cooling process, can the hood type resistance furnace accurately maintain the set temperature to avoid the adverse effects of temperature fluctuations on the organizational transformation of large workpieces? For example, the quenching process of some high-strength alloy steels requires extremely high precision control of temperature. A slight deviation may prevent the workpiece from achieving the expected mechanical properties. Moreover, the heat treatment processes of different types of large workpieces vary greatly. Does the temperature control system of the hood type resistance furnace have sufficient flexibility and adaptability to meet the diverse process requirements?
3. Loading and space utilization issues
The size and shape of large workpieces pose a challenge to the internal loading space of the hood type resistance furnace. Can the effective working space in the furnace accommodate large workpieces and ensure that there is reasonable heat exchange space around them? When loading large workpieces, how to ensure that their placement and posture are conducive to uniform heating? At the same time, considering the weight of large workpieces, are the bearing structure and loading and unloading devices of the furnace body strong and convenient enough? For example, for some extra-long and extra-heavy shaft workpieces, how to safely and efficiently send them in and out of the hood type resistance furnace, and how to avoid the vibration of the furnace body or uneven force affecting the heat treatment effect during the treatment process?
4. Energy consumption and cost-effectiveness issues
When handling large workpieces, the energy consumption of the hood type resistance furnace deserves attention. Since large workpieces require a lot of heat to complete the heat treatment process, factors such as the insulation performance of the furnace body and the efficiency of the heating elements will affect energy consumption. Under the premise of meeting the quality requirements of heat treatment of large workpieces, how to optimize the operating parameters of the hood type resistance furnace to reduce energy consumption? In addition, from a cost-effectiveness perspective, compared with other equipment suitable for heat treatment of large workpieces, what is the relationship between the equipment purchase cost, operation and maintenance cost of the hood type resistance furnace and the added value brought by the quality improvement of the treated workpiece? Whether it is possible to achieve economic rationality and sustainability while ensuring product quality has an important decision-making impact on enterprises in the selection of heat treatment processes for large workpieces.
