In the realm of copper stamped components, it’s not uncommon to encounter discoloration on the fracture surface during the stamping process. This vexing issue can be attributed to several key factors that need our attention.

The Role of Material Composition

The foremost factor contributing to discoloration in copper stamped components is the material composition. When the copper used in these components deviates from the required standards, it can result in non-conformity with the specified requirements. This deviation, in turn, leads to unsightly discoloration on the fracture surface of the workpiece.

Heat Generation and the Punching Process

Another significant factor in the discoloration saga is the heat generated during the punching process. This phenomenon unfolds in a few crucial steps, and understanding it is pivotal in addressing the issue effectively.

Metal Deformation and Tearing

The punching process isn’t just a simple act of creating holes; it involves a complex series of events. Initially, the metal undergoes deformation, which is closely followed by tearing. This combination of actions releases a considerable amount of heat. Copper, as a material, exhibits intense deformation and tearing during the punching process.

Duration and Heat Accumulation

The duration of deformation and tearing plays a pivotal role in heat generation. As a general rule, shorter intervals of these actions result in a more significant accumulation of heat. The heat buildup is especially prominent around the edges of the die, leading to a rapid increase in die temperature.

Cooling Fluid’s Role

During the punching process, cutting fluid is employed to cool down the die. However, the cooling effect is largely absorbed by the die itself. Meanwhile, the heat on the fracture surface of the copper material remains largely unaffected, as it undergoes a one-time tearing process. This differential cooling effect ultimately manifests as discoloration on the fracture surface of the copper material.

Discoloration’s Distinctive Hue

To understand the nature of the discoloration, it’s crucial to distinguish it from typical copper oxidation. While ordinary copper materials tend to exhibit dark red oxidation, the discoloration on copper stamped components is distinct. It takes on a rosy red hue, representing a classic case of high-temperature discoloration.


In conclusion, the occurrence of discoloration on the fracture surface of copper stamped components can be attributed to two primary factors. First, the material composition may not meet the required standards, resulting in non-compliance. Second, the actual discoloration during the punching process is a direct consequence of excessive heat generation at the fracture surface. Understanding these factors is the first step in mitigating the issue and ensuring the production of pristine copper stamped components.

Copper Stamped Components
Copper Stamped Components