Carburizing of stamping die is one of the important processes in die processing, and it is also the process that stamping die must be processed. However, the process after carburizing of stamping die is prone to some defects, resulting in some defects after the completion of die processing. There are five common defects in carburizing process of stamping die.
1. Low hardness
One of the reasons indicated by the content of austenite in Xinfeng, Jinan is that the hardness of stamping die is low, and the residual austenite content in carburized layer is often due to the high carbon concentration on the surface of high temperature carburizing, and the other reason is that the surface carbon concentration is very low, the carburizing temperature is too low; the flow rate of low carburizing gas is low; the vacuum quenching oil absorbs a lot of air; other oil, such as cylinder oil A large amount of vacuum quenching oil is mixed into the medium.
Second, the depth of carburized layer can not meet the technical requirements.
The reason why the depth of carburized layer of stamping die exceeds the standard is that the carburizing temperature is high or the carburizing time is long. The reason why the depth is lower than the technical requirement is that the carburizing temperature is low or the carburizing time is short.
3. Non-uniform Carburizing Layer of Stamping Die造成这种情况的原因可能是:渗碳气体与空气混合;无脉冲渗碳;渗碳气体压力过低;炉料过多，填充过密;渗碳气体纯度低，产生较多炭黑等。
The reasons may be: mixed carburizing gas with air; no pulse carburizing; too low pressure of carburizing gas; too much burden and too dense filling; low purity of carburizing gas and more carbon black.
4. Carbon black and bronzing die are also attached to carbon black.
When a large amount of carbon black is produced in the carburizing process, it may cause short circuit between heater and furnace body, between heater and heater, and increase the maintenance workload of equipment. The plugging in the hole of punching die and the uneven carburizing layer increase the work of removing carbon black surface parts.
Brightness Decrease of Stamping Die
Stamping dies should be silver-white after vacuum carburizing and air cooling. For example, the brightness of discharging parts deteriorates. The reasons may be: the furnace body produces a larger leakage; more air is mixed in vacuum quenching oil; the purity of cooling gas (such as nitrogen) is low and oxygen content is high. More cylinders are mixed with vacuum quenching oil.
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