Bending parts are often seen in machining production, such as completing V-shaped, U-shaped metal parts. In common cases, there are two methods for metal bending, one is die bending, and the other is bending machine bending. The former is suitable for complex structure, small volume, and large-scale processing. The latter is suitable for processing structures with large structure size and small output. For the processing technology of bending parts, let's introduce it to you in detail.
Processing technology of metal bending parts
1. Free bending
Free bending is a commonly used method in production. Free bending mainly uses the two edges at the opening of the die and the edge of the apex of the punch for bending, and the bending angle is determined by the depth of the punch entering the die.
The bending force required for free bending is small, so that the force on the mold is relaxed, which is of great help to prolong the service life of the mold. However, the inconsistency of the thickness and mechanical properties of the sheet will cause certain changes to the bending angle of the metal bending parts.
2. Correct the bending
Correction bending is the precision pressing of the punch on the rounded corners and straight edges of the workpiece. In the process of downward movement of the punch, the angle of the blank will be smaller than that of the punch, and until the stroke ends, the punch and punch correct the blank so that its rounded corners, straight edges, and bending radius are all close to the punch.
3. Three-point bending
Three-point bending is that the rounded corner at the entrance of the die made by stamping die suppliers and the surface of the pin form three points, which accurately determine the bending angle. If you want to change the height of the adjustable pins, you can get different bending angles. The hydraulic pad located between the punch and the slider, in order to compensate the deflection of the slider and the table, makes the material contact these three points along the full length of the die during the punching and bending process.
The pressure of the hydraulic pad is evenly distributed over the entire bending length, so that the thousands of miles of the punch are evenly distributed over the entire bending length. Each punch is elastically supported, so it can automatically adapt to the bending straightness of the die and ensure constant pressure distribution, thus improving the accuracy of the bending angle and the straightness of the bending edge.