Bend Test Of Sheet Metal

Geometry of tooling imposes a minimum bend dimension.

Bend test of sheet metal. These materials can take any feasible shape but when used in a bend test most commonly appear in sheets strips bars shells and pipes. If the metal sample does not crack or break at the specified angle it passes the test. Generally a bending test is performed on metals or metallic materials but can also be applied to any substance that can experience plastic deformation such as polymers and plastics. Figure 2 shows us a typical punch and die set used to bend sheet metal.

This is done through the application of force on a workpiece. The diagram shows one such mechanism. The force must exceed the material s yield strength to achieve a plastic deformation. Bend test at either a 90 or 180 degree angle.

Most frequently expensive sheet metal bending tools called brakes are used to bend sheet metal but you can also complete this task without one. The test bending machine is a cnc press brake in the elevator production sheet metal workshop. Use the minimum bend dimension values in the charts below for your minimum closeness of cutout to a bend. Refer to the chart for values for folder as well as various press brake tooling combinations.

Also known as press braking flanging die bending folding and edging this method is used to deform a material to an angular shape. A section view of a typical punch and die set used to create sheet metal bends. Astm e290 covers a bend test for flat metal samples of metallic material. The bend radius of a sheet metal design will be based on the wall thickness of the part and the tooling that is available in house.

The v groove has fasti 50 and beyeler and the scimitar upper die is selected as shown in figure 1. Of all the mathematical constants in precision sheet metal fabrication the k factor stands out. During testing the high stiffness fixture experiences little movement as high side loads increase when the compressive load is distributed to the bending rollers. Using instron s bend fixtures that include specimen stops which will ensure accurate and repeatable placement of specimens before starting testing.

Monkeys spinning monkeys by kevin macleod. Most tests are performed as a 3 pt. Sheet metal bend testing. In many cases this is a pass fail test.

The sample size is 100mm 100mm which uses laser cutting and blanking and the dimensional accuracy can reach 0 1mm. This punch and die set would be mounted in a press. This is the second part of a series covering the variables that affect the k factor value in bending. You can find the first article in this series by clicking here.