Sheet metal processing companies at domestic and abroad have higher and higher requirements on the forming accuracy and shape complexity of sheet metal products and bending tooling.
At the same time have higher requirements on the surface quality of sheet metal parts, especially for the bending of stainless steel plates and aluminum plates. No scratches require.
In order to avoid indentation on the surface of the workpiece during bending machine processing, in the experiment, the surface of the sheet metal part analyze from four aspects: the bending method of the sheet metal part, the material hardness, the die structure, and the accuracy of the machine tool and mold. Cause of indentation.
Ball non-indentation mold
When bending the metal sheet , the workpiece is in contact with the cemented carbide core rod on the lower mold during the bending process, and the core rod will rotate along the moving direction of the sheet.
So that the workpiece is in contact with the lower die , the traditional sliding friction becomes rolling friction, which greatly reduces the indentation and scratches on the surface of the workpiece due to extrusion
And effectively improves the appearance quality and accuracy of the workpiece. However, in the bending process, the lower die roller and the plate still have an extrusion force, which cannot completely avoid the bending indentation, especially when bending the soft plate.
Tension spring type non-indentation bending tooling
When the upper mold presses the workpiece into the lower mold body, because the workpiece is in contact with the rotating flap plane, the rotating flap rotates in the lower mold body, and the workpiece does not slide relative to the rotating flap during the entire bending process.
At the same time, The workpiece is in surface contact with the rotating flap, which eliminates the indentation and scratches on the surface of the workpiece due to extrusion, and effectively improves the appearance quality and accuracy of the workpiece.
Youli glue anti-indentation die
By using anti-indentation rubber pads, single-V concave mold anti-indentation rubber sleeves, block-shaped Youli glue+AT pad lining, hard rubber concave molds, etc., to solve the indentation on the surface of the workpiece
During bending, and meet the product quality requirements, But rubber pads, rubber sleeves, rubber blocks and hard rubber are easily deformed during the bending process and have a short service life, which affects the dimensional accuracy of the bending workpiece. It is only suitable for the bending of workpieces with low dimensional accuracy.