• June 21, 2024
  • Shatou, Changan, Dongguan, CN
Bending sheet metal parts

How to bend sheet metal?

This article will introduce the basic concepts of bending, as well as typical bending equipment, different types of sheet metal bending methods, and will also discuss in detail bending allowance and springback, etc. Technical considerations to help readers better understand and master this important technology.

1, What is sheet metal bending?

Sheet metal bending is a metalworking technique by which a flat metal part is processed and folded into a U-shape, V-shape or grooved shape.

Sheet metal bending is usually done using mechanical and manual operations to achieve precise bending and shaping of parts. This technology can be used to manufacture a variety of products, including auto parts, kitchen appliances, electrical components, and more. The use of sheet metal bending technology can produce high-quality small and medium-sized batch parts at relatively low manufacturing costs.

2, Common ways of bending sheet metal

1) L-bending

L-bending is divided into 90°bending and non-90°bending according to the angle, and its name is determined according to the angle within the bending. 90°bending deformation factor is 0.4 times of material thickness.

2) N-fold

According to the size, N-fold forming can adopt two processing methods: directly divided into two-fold forming or folding flat after adding gaskets.

3) Z-fold

Z-folding is also called breakage. According to the forming angle, it is divided into straight edge breakage and hypotenuse edge breakage. The processing method depends on the height of the breakage. When the breakage height h of the straight edge is less than 3.5 times the thickness of the material, the breakage mold is used. Or easy to mold, and the material greater than 3.5 times the thickness is completed by ordinary front and back folding.

4) Pressing dead edge

Pressing the dead edge, also known as back folding and flattening, its forming process is completed by two steps: first bending to about 35 degrees, this step is the insertion of deep and then pressing out the dead edge with the flattening die. When working, attention should be paid to the parallelism of the large surface after forming.

3, Stainless steel plate bending its characteristics

1 )Because of poor thermal conductivity than ordinary low-carbon steel, low elongation, results in the required deformation force.

2 ) 321 stainless steel sheet in bending compared with carbon steel has a strong tendency to rebound.

3 ) Compared with carbon steel, stainless steel has lower ductility, so a larger bending radius R is required during bending, otherwise cracks may occur.

4 ) Due to SUS304 stainless steel plate hardness, the cold hardening effect is significant so in the choice of press bending tool to choose heat treatment hardness should reach more than 60HRC tool steel, its surface roughness than the carbon steel press bending tool an order of magnitude higher.

4, Stainless steel bending measures and methods

1) As the thickness of the sheet increases, so does the force required to bend. Therefore, when choosing bending equipment, it is necessary to consider the thickness of the plate and the corresponding bending force allowance. The greater the thickness of the sheet, the greater the bending force allowance should be to ensure that the bending process can be successfully completed.

2) As the tensile strength increases, the corresponding elongation decreases, so greater bending forces are required to bend the material, and with greater bending angles.

3) The design of the plate thickness and bending radius corresponds to the case, according to experience, a bending workpiece unfolded size of the right-angled side of the sum minus two plate thicknesses, can fully meet the design accuracy requirements, according to the empirical formula to calculate the amount of unfolded can simplify the calculation process greatly improve production efficiency.

4) The greater the yield strength of the material, the greater the elastic recovery, in order to obtain the angle of 90 degrees bending parts, the angle of the required pressure knife to design the smaller. Relative to the same plate thickness of carbon steel stainless steel bending angle is larger, which should pay special attention to the bending cracks that will occur, affecting the strength of the workpiece.

Jmproto provides sheet metal bending services

Jmproto provides customized sheet metal production services, including bending, punching, shearing, laser cutting, welding and other processes, which can meet customers’ various sheet metal processing needs.

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