In the bend press operation metal bend process may appear not accurate at all. Various factors may relate to the bend operation varying from tools to back spring. There has been a great attempt to fit the innovative technologies with press-brake bending to avoid bend troubles. Operators and shop owners should have awareness on the ways to escape the main troubles related to precise part producing. So, the HARSLE masters are willing to share their experience with you on this matter.
Equipment Position Accuracy
Regardless of whether you use mechanical press brakes or innovative electrical press brakes, the bend troubles during metal formation might not relate to the equipment precision or repeatability. Certain steps can check whether the press brake repeats precisely, for example by setting magnet base-dial indicators upon the frame and determining bottom of the strokes time and again. Conventional press brakes offer this positioning, the range limits of 0.0005 -0.001 or even more precisely, being under charge in the bend step of conventional press brakes. Also, make sure that each gib on the piston are tightened correctly.
Levels of precision may vary and this point determines the tool price. If you make more expenses about making your tools more accurate and repeatable, you will have them in proper condition. For instance, the most inexpensive formation tools are elementary «cold plane» ones normally possessing 30-32 RC rigidity. Bland tools like these do not cost much to purchase, are simple to cut, and thus, easily damaged. Besides, they offer lineal precision of about 0.001 for each foot.
Default of precision is exacerbated in case of cutting tools in small sections, later combined to be used for box formation appliance.
This makes the adjustment of the free deviation of rams and frame possible during the bend procedure. Once, a shim used to be input beneath the die to raise it by just a few thousand inches to exclude canoe effect on the pieces shaped with insufficient crowning. Further improvements have brought this specification to the equipment base and the die carrier. Adequate and controllable crowning is essential to bend precise, slim, long pieces.
Material types, yielding force, accurate thickness and back spring are no less important.
Nowadays, steel materials as thick as12 Gage or above is probably derived from a mixture of recycled metal materials, that are designated as A36. This A36 type is quite hard, tough and demands greater burden than light steels of previous generation. About 30 percent greater burden is demanded than primary mild steels, since, while processing, these metals get blended with various other steel materials comprising nickel, chrome, significantly reduce their ductility while added to milder steel. Knowing the material yielding force, possible back spring is crucial.
Tuning these features into the position of the plunger manually or automatically, the press brake will repeatedly produce exact angles.