China Aluminum Network – Everyone involved in aluminum profile extrusion knows that it’s not worth scrapping bent profiles. This issue should never happen, and it can be prevented! So, how can you minimize or avoid scrap? Let’s take a closer look at the key factors that contribute to bending and how to handle them properly.
Extrusion and straightening are critical steps in the process. Straightening is a vital stage that must be handled with care. If the force applied is too strong, 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 won’t be straightened effectively, resulting in bends. It's all about finding the right balance to ensure quality without compromising the integrity of the material.
The extrusion press plays a crucial role as well. After cutting the profile to the desired length, it needs to be placed into a frame. When doing this, pay attention to whether the material is oversized or undersized, and whether it was pulled from a tube or a flat die. Typically, materials pulled from tubes or standard molds are less likely to bend at the ends. However, when dealing with smaller profiles or flat dies, the ends can easily become distorted. In such cases, it's best to start by tightening the ends and gradually moving toward the center for better alignment. Even for complex shapes like louvers, window frames, or lids, it's essential to place them on suitable supports and lift them into the frame properly to prevent damage.
Surface treatment also plays a significant role in preventing bending. Once the billet has been aged and its hardness meets the required standards, the profile becomes more resistant to deformation. However, even aged profiles can still bend if handled improperly. Be careful when moving the material, especially at the ends. Avoid sudden vertical movements or excessive shaking, as these actions can cause even hardened profiles to bend. Taking the time to handle each piece with care during all stages of production can make a big difference in reducing waste and improving overall efficiency.
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