Sheet metal bending technology 12 big problems and solutions|
By jett NG | 13 September 2021 | 0 Comments

Sheet metal bending technology 12 big problems and solutions|

Sheet metal bending technology 12 big problems and solutions|


Sheet metal parts bending forming is carried out on the bending machine, to be formed on the workpiece bending machine, using the lifting lever will brake shoe lift, so that the workpiece slide to the appropriate position, and then brake shoe down to the required forming of the workpiece, through the bending lever on the bending machine force, Realize metal bending forming.


The bending radius is related to the ductility and thickness of the forming metal.


For aluminum plates, the bending radius of the metal is greater than the thickness of the plate.


When bending, the metal bends at a slightly larger Angle than required due to a certain springback.


The bending of the metal plate is done on the metal working site.


Sheet metal processing is simply a series of processes that bend, rivet and weld metal materials.


The following are the problems and solutions encountered in the bending process of sheet metal processing.


Problem a


Bending edge is not straight, size is not stable.


The reason:


1. No pressing line or pre-bending is arranged during the design process.


2. Material pressure is not enough.


3. Convex and concave die fillet wear asymmetry or uneven bending stress.


4. The height size is too small




The solution


1. Design pressing line or pre-bending process


2, increase the pressure


The convex and concave die clearance is uniform, and the rounded corner is polished.


The height dimension shall not be less than the minimum limit dimension.


Question 2


The outer surface is bruised after being bent.


The reason:


1, the surface of the raw material is not smooth


Punch bending radius is too small;


3. The bending gap is too small


The solution


Improve the finish of convex and concave die;


Increase the bending radius of the punch.


Adjust the bending clearance.


Question 3


The bending Angle is cracked.


The reason:


Bending radius is too small;


2. The direction of the material is parallel to the bending line.


3. Burr of blank outward.


4. Poor metal plasticity


The solution


Increase the bending radius of the punch.


The second is to change the blanking layout.


3. Replace burrs with rounded corners of parts.


4. Anneal or use soft materials.


Problem four


Bending causes deformation of the hole


Reason: when the elastic bending and hole positioning are used, the outer side of the elbow is strained by friction between the concave die surface and the outer surface of the parts, so that the positioning hole is deformed.


The solution


1, the use of shape bending


2. Increase the pressure on the roof.


A pitting grid is added to the top plate to increase friction and prevent the product from sliding when bent.


Problem five


The extrusion material becomes thinner on the curved surface


The reason:


The rounded corners of the concave die are too small;


2, convex and concave die clearance is too small


The solution


1. Increase the radius of the concave die fillet


2. Correct the clearance between convex and concave dies


Question 6


The end face of the workpiece bulges or is uneven


The reason:


1. When bending, the outer surface of the material will shrink and deform when it is stretched in the circumferential direction, and the inner surface will stretch and deform when it is pressed in the circumferential direction, so the end face will expand when it is bent in the bending direction.


The solution


1, parts in the final stage of stamping convex and concave die should be enough pressure


2. Make the concave die fillet radius corresponding to the outer fillet of the parts.


Third, improve the working procedure.


Question 7


The bottom of the concave part is uneven

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