During the bending and stamping process of stainless steel coils, due to its unique material characteristics, special attention should be paid to some processing techniques and parameters to ensure the forming effect and avoid material damage. Here are some things to pay attention to:
1. Choose the right tools and molds
Mold materials and design: During the stamping and bending process, mold materials with higher hardness should be used to avoid mold wear or deformation during processing. The mold design should ensure uniform force application to avoid excessive local force on the material.
Mold smoothness: The mold surface needs to be kept smooth to reduce friction with the stainless steel coil and avoid affecting the forming effect due to excessive friction.
2. Reasonable bending radius
Stainless steel materials have high hardness and strength, and a suitable bending radius should be selected when bending. Too small a bending radius can easily cause cracks or fractures in the material. Generally, the bending radius should not be less than 3-5 times the thickness of the material.
It is necessary to ensure that the elastic recovery of the material does not exceed the limit during bending to avoid rebound deformation.
3. Control the stamping pressure
The pressure applied during the stamping process should be adjusted according to the hardness and thickness of the stainless steel. Excessive stamping pressure may cause excessive deformation or damage to the material, while too little pressure may result in inadequate processing and failure to achieve the desired effect.
The pressure control system of the stamping equipment can be adjusted to ensure accurate application of pressure.
4. Consider the yield strength of the material
Different types of stainless steel (such as 304, 316, 430, etc.) have different yield strengths, so when stamping and bending, the processing technology needs to be adjusted according to the yield strength of the specific material.
For high-strength materials, it may be necessary to increase preheating treatment or use more efficient processing equipment.
5. Temperature control
In some cases, especially for thicker stainless steel coils, hot stamping and bending are necessary. Heating the material can reduce its hardness and plasticity, making it easier to form.
However, when performing heat treatment, the heating temperature must be controlled. Excessive temperature will cause the grains of stainless steel to coarsen, thereby affecting the mechanical properties of the material.
6. Avoid excessive bending or stamping
During the processing, avoid excessive bending or excessive stamping to avoid cracks or breakage. Especially for high-strength stainless steel, due to its high tensile strength, excessive bending can easily cause brittle fracture.
Ensure that the bending angle and stamping depth are controlled within a reasonable range to avoid exceeding the plastic limit of the material.
7. Deburring and trimming
After bending or stamping, burrs may appear on the surface of the material, especially on the stamping edge. Burrs not only affect the appearance, but may also cause damage in subsequent use. Therefore, deburring is required later.
Common deburring methods include mechanical deburring, chemical deburring, etc.
8. Ensure the processing sequence
For complex stamping and bending operations, the processing sequence should be reasonably planned. For example, bend at a larger angle first, and then make fine adjustments or presses. Reasonable processing sequence can reduce repeated deformation of the material and ensure molding accuracy.
9. Lubrication and cooling
During the stamping or bending process, the use of appropriate lubricants can reduce friction and reduce the friction between the material and the mold, thereby reducing equipment wear, extending the service life of the mold, and avoiding damage to the stainless steel surface.
Using coolant or spray cooling can effectively reduce the high temperature generated during processing and avoid deformation or damage caused by overheating of the material.
10. Material rebound
Stainless steel has strong rebound elasticity, especially when bending, rebound may cause the final shape to not meet the requirements. In order to reduce rebound, you can use appropriate bending dies and adjust the torque during the bending process, or improve the rebound effect by controlling the pretreatment state of the material.
11. Check the status of the equipment
Ensure that the equipment such as punching machines and bending machines are in good working condition, and perform regular maintenance inspections to avoid poor processing quality due to equipment failure.
By following these precautions, you can improve the processing accuracy of stainless steel coils in bending and stamping, extend the life of dies, reduce material waste, and ensure the quality and performance of the final product.
