Stainless Steel Mesh Sheet Problems When Stretching
Stainless steel products are favored by people for their exquisite appearance, excellent corrosion resistance, high temperature oxidation resistance and high and low temperature strength. They are increasingly used in decoration, light industry, civil hardware, kitchen equipment and utensils industries. . Due to the high quality requirements of such products, it is very difficult to ensure that the surface of the product with high brightness is not scratched and scratched during the whole processing of the product, especially the mold selection due to the tensile properties of the stainless steel sheet. Problems such as heat treatment, processing and process lubrication directly affect product quality, production, cost and mold life.
Stainless Steel Mesh Sheet Tensile Characteristics And Adhesion
Due to the high yield point and high hardness of the stainless steel, the cold work hardening effect is remarkable, and the characteristics of the stainless steel sheet when stretched as follows:
1. Because the thermal conductivity is worse than ordinary low carbon steel, the required deformation force is large.
2. When the stainless steel plate is stretched, the plastic deformation is severely hardened, and the thin plate is easily wrinkled when stretched, and a large blanking force is required.
3. The rebound caused by the bending and reverse bending of the sheet at the corner of the drawing die usually results in the formation of a concave deformation on the side wall of the product, so that the product with higher dimensional accuracy and shape requirements needs to be increased in shaping process.
4. The phenomenon of adhesive tumor is easy to occur during the stretching process of stainless steel sheet.
From the microscopic point of view, the sheet and the surface of the mold are both rough and uneven interfaces. Due to the large blanking force during the stretching process, the load is subjected to a large unit pressure by the local convex portion; The plastic deformation of the movement and the sheet material produces thermal energy, which causes the viscosity of the lubricating film to decrease and the strength to decrease. The raised portion of the sheet is under high pressure, instantaneous high temperature, under the action of shearing, the lubricating film is broken, and the sheet is in direct contact with the mold. The raised portion of the material is scraped off by the convex portion of the mold to be in front of the convex portion of the debris pile mold. If the temperature is high enough, the debris is softened, melted, and welded to the mold to form a bonded tumor. Once formed, the bonded tumor is difficult to fall off and becomes more viscous, resulting in severe scratches on the surface of the stainless steel sheet stretched product. In addition, the stretching speed, the size of the sheet deformation, and the like also play an important role in the formation of the adhesion tumor. How to avoid the formation of tensile mold bonding tumors and improve the surface quality of the tensile members is a technical problem in the stretching of stainless steel sheets.
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