The purpose of heating in forging production and heating methods
Release time:
2020-07-07
The heating of the blank (raw material for forging) before forging is an indispensable and important part of the entire forging process, which has a direct impact on improving forging productivity, ensuringForgingquality, as well as saving energy consumption and reducing product costs.
1. Purpose and Requirements of Heating
(1) Purpose of Heating
To improve the plasticity of metals, reduce the resistance to deformation, making it easier to shape, and obtain good post-forging structure and mechanical
properties.
(2) Requirements of Heating
① Heat to the predetermined temperature at the fastest speed under the allowable thermal conductivity and internal stress conditions of the metal material, to improve efficiency and save energy.
② Minimize the absorption of harmful gases by the heated metal, such as oxygen, hydrogen, nitrogen, etc., reduce defects such as oxidation, decarburization, or hydrogen embrittlement, and improve heating quality.
③ During the low-temperature heating stage, prevent excessive temperature differences between the outer layer and the core of the metal cross-section due to improper heating, which can cause excessive thermal stress, compounded by other internal stresses, leading to material rupture.
④ Accurately implement the specified heating specifications, such as heating temperature, speed, time, and insulation conditions, to prevent defects such as overheating and overburning.
③在低温加热阶段，要防止因加热不当而使金属截面的外层与心部产生过大的温
差，以致造成过大的热应力，再叠加其它内应力，引起材料破裂。
④准确实施给定的加热规范，如加热温度、速度、时间和保温等加热条件，以防产生
过热、过烧等缺陷。
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