Metal drawing is a common metal processing method that is widely used in various fields, such as construction, automotive, and electronics. However, during the metal drawing process, there are often some problems that affect product quality and production efficiency. This article will introduce common problems in metal drawing products, analyze the causes of the problems, and propose corresponding solutions.
Cracks: During the process of metal stretching, the material is subjected to tensile forces. When the tensile force exceeds the material's bearing capacity, cracks can occur. The occurrence of cracks may be due to quality issues in the material itself, such as inclusions, pores, etc., or may be due to excessive stretching speed or excessive stretching ratio.
Wrinkling: During the process of metal stretching, if the thickness of the material is uneven or the stretching mold design is unreasonable, wrinkling may occur. Wrinkling not only affects the appearance quality of the product, but also may lead to product scrap.
Dimensional deviation: The dimensional accuracy of metal drawing products is one of the important indicators for evaluating product quality. However, in the actual production process, due to mold wear, equipment accuracy degradation, and other factors, product dimensional deviations often occur.
Poor surface quality: The surface quality of metal drawing products has a significant impact on the product's performance and appearance quality. Common surface quality issues include scratches, dents, oxidation, etc. These problems may be caused by rough molds, poor lubrication, or improper operation.
Optimizing material selection: When selecting metal tensile materials, factors such as mechanical properties, chemical composition, and metallographic structure should be fully considered to ensure reliable material quality. Meanwhile, for products produced in large quantities, material retesting can be conducted to ensure the stability of material quality.
Adjust the stretching process parameters: According to the properties of the material and product requirements, reasonably adjust the stretching speed, stretching ratio, and other process parameters to avoid problems such as cracks and wrinkles. In addition, for materials with uneven thickness, methods such as preheating or segmented stretching can be used to improve the forming performance of the material.
Improve the accuracy of mold design and manufacturing: The design and manufacturing accuracy of the mold directly affects the quality of the metal drawing product. Therefore, in the process of mold design and manufacturing, the shape, size, and accuracy requirements of the product should be fully considered, and advanced processing equipment and process methods should be adopted to ensure the quality and accuracy of the mold.
Strengthen equipment maintenance and repair: Regularly inspect and maintain metal stretching equipment to ensure that the accuracy and performance of the equipment are in good condition. In the case of severe mold wear, it is necessary to repair or replace it in a timely manner to avoid product dimensional deviations.
Improve lubrication conditions: Good lubrication conditions can effectively reduce the frictional resistance during metal stretching, reducing surface quality issues such as scratches and indentation. Therefore, when selecting lubricants, it is important to choose the appropriate lubricant type and application method based on the material properties and product requirements.
Strengthen operational training and management: Regularly train and manage operators to improve their operational skills and awareness, ensuring operational norms and safety. At the same time, establish a sound production management system and quality control system to strictly monitor and manage the production process, and identify and solve problems in a timely manner.
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