In the steel bending industry, stainless steel plate bending and stainless steel tube bending are the most common operations. When performing bending operations on them, it is essential to master some processing techniques or key points.
Let's first talk about the bending of stainless steel plates. Generally, as the thickness of the steel plate increases, the bending force should be adjusted accordingly when setting up the bending equipment. Additionally, under the same unit size of stainless steel bending, the greater the tensile strength of the steel plate, the smaller its elongation rate. Therefore, the bending force and angle should be increased accordingly.
If the thickness of the stainless steel plate corresponds to the bending radius in the design drawing, the unfolded dimension of our bent workpiece should be the sum of the right-angle side and the thickness of the double-layered plate. This ensures that the design accuracy requirements are met. Lastly, it is important to note that the higher the yield strength of the stainless steel material, the greater the extent of elastic recovery. If a 90-degree angle can be achieved for the bending section, the angle of the bending die should be designed to be smaller.
Now let's discuss the key points of bending stainless steel tubes:
Generally, there are two methods for bending stainless steel tubes: cold bending and hot bending.
1. Cold Bending: This method usually involves using a bending machine to perform multiple rolling operations to achieve the desired bending. However, this method is not perfect. Due to the limited diameter of the steel tube, the bending angle is typically only between 1cm and 5cm. Additionally, the curvature is too small, and the steel tube diameter is prone to deformation.
2. Hot Bending: This method typically involves filling the stainless steel tube with sand and then subjecting the workpiece to high-temperature heat treatment and stretching. Compared to cold bending, this method is the most ideal. However, it is not perfect either, as the processing cost for this method is high and it is generally not suitable for large-scale production.
Common issues with stainless steel tube bending:
During the process of bending stainless steel tubes, it is common to encounter surface cracks on the tubes. This situation usually occurs after the tube undergoes tensile deformation, demolding, or impact or vibration-induced stretching. If not addressed promptly, the cracks can worsen over time. The main reasons for this are the low ductility, high elastic modulus, and large hardening index of stainless steel materials. The plastic deformation stage from yield to cracking is relatively short.
Based on the classification of stainless steel, it is found that austenitic stainless steel has a higher cold work hardening index. It is an unstable material that undergoes phase transformation during deformation and is prone to forming martensitic structures, which are brittle and easily lead to cracks.
Let's first talk about the bending of stainless steel plates. Generally, as the thickness of the steel plate increases, the bending force should be adjusted accordingly when setting up the bending equipment. Additionally, under the same unit size of stainless steel bending, the greater the tensile strength of the steel plate, the smaller its elongation rate. Therefore, the bending force and angle should be increased accordingly.
If the thickness of the stainless steel plate corresponds to the bending radius in the design drawing, the unfolded dimension of our bent workpiece should be the sum of the right-angle side and the thickness of the double-layered plate. This ensures that the design accuracy requirements are met. Lastly, it is important to note that the higher the yield strength of the stainless steel material, the greater the extent of elastic recovery. If a 90-degree angle can be achieved for the bending section, the angle of the bending die should be designed to be smaller.
Now let's discuss the key points of bending stainless steel tubes:
Generally, there are two methods for bending stainless steel tubes: cold bending and hot bending.
1. Cold Bending: This method usually involves using a bending machine to perform multiple rolling operations to achieve the desired bending. However, this method is not perfect. Due to the limited diameter of the steel tube, the bending angle is typically only between 1cm and 5cm. Additionally, the curvature is too small, and the steel tube diameter is prone to deformation.
2. Hot Bending: This method typically involves filling the stainless steel tube with sand and then subjecting the workpiece to high-temperature heat treatment and stretching. Compared to cold bending, this method is the most ideal. However, it is not perfect either, as the processing cost for this method is high and it is generally not suitable for large-scale production.
Common issues with stainless steel tube bending:
During the process of bending stainless steel tubes, it is common to encounter surface cracks on the tubes. This situation usually occurs after the tube undergoes tensile deformation, demolding, or impact or vibration-induced stretching. If not addressed promptly, the cracks can worsen over time. The main reasons for this are the low ductility, high elastic modulus, and large hardening index of stainless steel materials. The plastic deformation stage from yield to cracking is relatively short.
Based on the classification of stainless steel, it is found that austenitic stainless steel has a higher cold work hardening index. It is an unstable material that undergoes phase transformation during deformation and is prone to forming martensitic structures, which are brittle and easily lead to cracks.
