Bending Sheet Metal Hardness Or Yield Strangth

1 automobile bodies such as this ford 500 are dependent on the ability ofsheet metal to.

Bending sheet metal hardness or yield strangth.

The greater the yield strength of the material the greater the spring back and the smaller the angle of the punch die should be designed for the angle of 90 degrees of the bending part. It is the maximum stress that the sheet metal material is subjected to before pulling out. To find the ball park figure for the yield strength convert the hardness number to mpa or psi and divide by 3. N mm2 or mpa the symbol is σb.

It is one of the indexes of metal strength. Tensile yield strengths and ductilities for some of the plain carbon and low alloy steels are given in the following mechanical properties of steel chart. For example take the vickers number which has the dimension kg mm2 and multiply by 10 to approximately convert it to mm2 mpa then divide by three. The yield strength in tension is about 1 3 of the hardness.

Because ss 304 contains 18 chromium cr and 8 nickel ni it s also known as 18 8 stainless steel type 304 has good processability weldability corrosion resistance heat resistance low. It is the maximum stress that the cross section is subjected to when the load is applied between the two points of the. This distorts the steel s grain structure which increases its hardness and tensile strength while decreasing ductility. Sheet metal fabricators and hammer formers deal with this too.

And i ve sometimes performed a three step bend a 2 degree bend in front of the bend centerline a 2 degree bend from behind the bend and then an 86 degree bend in the center. Aisi 304 grade stainless steel uns s30400 aisi 304 stainless steel uns s30400 is the most commonly used material in stainless steels and is usually purchased in an annealed or cold worked state. Yield strength tensile strength and ductility values for steels at room temperature. This is an important question when bending sheet metal as every material has its own individual load capacity with regard to yield point and tensile strength.

Generally as supplied materials annealed at the haynes international mills have sufficient ductility for mild forming. Offset yield strength and yield by extension under load eul were developed total elon tion offset yield stren yield strength fracture 2 byeul pgortional limit a en neerin strain e fig. The alloy composition of the material is important as well since the addition of alloying elements can significantly affect the mechanical strength of a material. In my 40 plus years in the trade i have bent quite a lot of 6061 t6 aluminum.

After a piece of tempered sheet metal or aluminum is worked with a hammer for a while it begins to get hard and brittle so you may need to temper it again to be. However for higher levels of cold deformation where cracking is a possibility due to a reduction in ductility a series of successive forming operations is recommended each followed by an intermediate annealing treatment.