Fengdong

News Center

10

2023

-

01

Introduction to the Basic Structure and Classification of Box-Type Quenching Furnaces

Author:


The box-type quenching furnace is a batch-operated furnace suitable for the heat treatment of bar-shaped and long-axis components. The structure of the box-type quenching furnace consists of a cylindrical, deep-well-shaped furnace body. Workpieces are vertically loaded into the furnace using a dedicated crane for heating. The fuels typically used are gas and oil. When electricity serves as the heat source, the furnace is referred to as a well-type resistance furnace. Box-type quenching furnaces are generally installed below the workshop floor level; however, they can also be located above the floor level or split equally between above and below the floor level. The box-type quenching furnace goes by various names, including forced-convection box-type quenching furnace, natural-convection box-type quenching furnace, and well-type gas carburizing furnace. Box-type quenching furnaces can utilize either gaseous or liquid fuels, or they can be electrically heated.
  The box-type quenching furnace is a batch-operated furnace suitable for the heat treatment of bar-shaped and long-axis parts. The structure of the box-type quenching furnace is as follows: the furnace body is a cylindrical deep well, and the workpieces are vertically loaded into the furnace using a dedicated crane for heating. The fuels typically used are gas and oil. When electricity serves as the heat source, the furnace is referred to as a shaft-type resistance furnace. Box-type quenching furnaces are generally installed below the workshop floor level; however, they can also be located above the floor level or divided equally between above and below the floor level.
 
  Box-type quenching furnaces are also known as forced-convection box-type quenching furnaces, natural-convection box-type quenching furnaces, and shaft-type gas carburizing furnaces, among others. Box-type quenching furnaces can be fueled by either gaseous or liquid fuels, or they can be electrically heated. When using gaseous fuel, the furnace is typically equipped with multiple small-capacity burners arranged tangentially along the inner walls of the furnace chamber, uniformly distributed in layers or in a spiral pattern at different heights. This arrangement prevents flames from directly impinging on the workpieces and ensures uniform temperature distribution within the furnace. When used for low-temperature tempering or when oil serves as the fuel, the furnace chamber is lined with thin muffle walls that separate the combustion zone from the heating zone. However, box-type quenching furnaces equipped with muffle walls tend to have higher fuel consumption.

Latest updates

2024-12-01

Lean Management in Heat Treatment Production

Heat treatment is an important component of the mechanical processing industry. Within the industry, there are two main types of production methods—each differing in scale and nature: one is small-batch, order-driven production for individual parts, and the other is a multi-batch, high-volume production model. In recent years, with the rapid development of the machinery industry, the heat treatment processing sector has also experienced swift growth. However, the technical standards and management practices in this sector remain unstandardized, resulting in suboptimal economic and social benefits. For enterprises seeking to grow and enhance their economic performance, it is essential to broadly analyze potential issues in heat treatment production while prioritizing quality improvement and cost reduction. Moreover, it is crucial to proactively identify and address possible problems at an early stage. By adopting lean management principles, optimizing processes and workflows, and standardizing operations and procedures, we can ensure that heat treatment quality is inherently built into the manufacturing process rather than merely inspected afterward. Only by earning greater customer trust and securing more orders can we effectively reduce heat treatment production costs.

2024-11-18

Methods for Controlling Residual Austenite in Heat Treatment

After quenching, parts invariably retain some residual austenite, to a greater or lesser extent. Excessive residual austenite is detrimental to the service life and hardness of the parts, potentially leading to soft spots and dimensional instability. However, a moderate amount of residual austenite can actually enhance the fatigue strength of the parts. By carefully controlling the level of residual austenite, we can effectively manage product quality and service life, thereby achieving the desired outcomes.

2024-10-24

Classification of Heat Treatment Cracks

Quenching cracks—longitudinal cracks (microstructural stress type), arc cracks (local tensile stress type), quenching cracks in large workpieces (longitudinal and transverse fractures), surface cracks along edges and contours (local tensile stress type), decarburization cracks, and Type II stress cracks.