Sheet metal bending
The bending of sheet metal refers to the processing of changing the angle of the sheet or panel.Such as the processing of sheet or panel angles.For example, the plate is bent into a V-shape, a U-shape, and the like.In general, there are two ways to bend a sheet metal: One method is mold bending, which is used for sheet metal structures with complicated structure, small volume and large batch processing; Another type of bending machine bends for processing sheet metal structures with large structural size ratios or yields that are not too large.At present, the company's products are mainly bent and bent.
These two bending methods have their own principles, characteristics and practicality.
●Mold bending
1.Common bending mold
Commonly used bending molds, as shown in the figure: In order to extend the life of the mold, the parts should be designed with rounded corners as much as possible.
Too small a flange height, that is, the use of a bending die is also not conducive to forming, generally the height of the flange is L ≥ 3t.
2.Bending machine bending
The bending machine is divided into two types: ordinary bending machine and CNC bending machine.The precision requirements are high, and the bending of the sheet metal with irregular bending shape is generally bent by a CNC bending machine. The basic principle is to bend and form the sheet metal part by using the bending knife and the V-shaped groove of the bending machine.
Advantages: convenient clamping, accurate positioning and fast processing speed.
Disadvantages: low pressure, can only be processed simply, and the efficiency is low.
2.1Basic principle of forming：
As shown below:
(1) Bending knife: The bending knife is as shown in the figure. The machining is mainly based on the shape of the workpiece.
(2) The lower die is generally V=6t mode：
There are many factors affecting the bending process, including the arc radius of the upper die, the material, the thickness of the material, the strength of the lower die, and the die size of the lower die. See picture.
Basic principle of bending processing sequence：
（2.1）Bending from the inside out;
（2.2）Bending from small to large；
（2.3）Bend special shapes first, then bend the general shape；
（2.4）After the previous process is formed, it does not affect or interfere with subsequent processes.
As shown below:
2.2Bending radius
When the sheet metal is bent, a bending radius is required at the turning point, and the bending radius should not be too large or too small, and should be appropriately selected. If the bending radius is too small, the bending will be cracked. The bending radius is too large and the bending is easy to rebound.
2.3Bending back
(1) rebound angle △α=b-a
Where b----the actual angle of the workpiece after rebound.
a--the angle of the mold.
2.4 Interference phenomenon during bending.
For the second or more times of bending, the bending workpiece often interferes with the props. As shown in the figure, the black part is the interference part, so that the bending cannot be completed, or the bending deformation is caused by the bending interference.
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