At China Aluminum Network, we understand that anyone involved in aluminum profile extrusion knows how frustrating it is to end up with bent or scrapped profiles. This situation shouldn't happen, and it's definitely avoidable! So, the question is: how can you reduce or even eliminate scrap due to bending? Let's dive into some key practices that can help.
First, the extrusion and straightening process plays a crucial role. Straightening is a critical step that must be handled carefully. If the force applied during straightening is too high, it can lead to deformation, cracking, or an orange peel effect on the surface. On the other hand, if the pressure is too low, the profile may not be properly straightened, resulting in bends that compromise quality. Finding the right balance is essential for maintaining the integrity of the final product.
The extrusion press itself is another important factor. After cutting the profile to the desired length, it needs to be placed on a frame. When doing so, you need to pay attention to whether the material is oversized or undersized, and whether it was pulled out from a tube or a flat die. Typically, materials pulled from a tube or a standard mold are less likely to bend at both ends. However, when dealing with small-sized materials or flat molds, the two ends tend to warp more easily. In such cases, it’s best to gradually bring the ends toward the center while framing the material. Even for complex profiles like louvers, window frames, or lids, they should be placed on suitable support structures and lifted into the frame promptly to prevent deformation.
Surface treatment also plays a role in preventing bending. Once the billet has been aged and reached the required hardness, the profile becomes more resistant to bending. However, even after aging, care must still be taken during handling. Avoiding strong vertical movements when moving the material can prevent unnecessary stress. Sudden jolts or vibrations can cause even hardened profiles to bend, so careful and controlled handling is always recommended.
In summary, by focusing on proper straightening techniques, careful framing, and mindful handling during surface treatment, you can significantly reduce the risk of bending and scrapping in your aluminum extrusion process. These steps not only save time and materials but also ensure higher-quality output and greater customer satisfaction.
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