Precision and bending process application of high-precision CNC Press Brake

The precision requirements of high-precision CNC Press Brake

(1) Accuracy, which mainly refers to bending accuracy, which is very important because it determines whether to use CNC or NC. Generally, the bending accuracy is ±1°, and if it cannot be changed, then should choose the CNC press brake

(2) Mold, a conventional mold, its deviation per foot is about ±0.001 inches, and its total length deviation is not more than ±0.005 inches. For fine grinding molds, the size requirements are higher, which are 0.0004 and 0.002. Therefore, the precision grinding of the mold is more suitable for the CNC bending machine. Conventional molds are more suitable for NC bending machine.

(3) The CNC system of the Press brake, generally speaking, will use E200, DA41S, DA52S, DA53T, DA58T and DA66T.

(4). What are the V groove and V10 of the CNC bending machine?

For CNC bending machines, the V-slot means that the slot of the lower die is V-shaped, and V10 means that the slot width is 10mm.

What are the high-precision CNC press brake in the elevator car bending process?

The elevator car is mainly composed of door panels, wall panels, three-piece sets (front wall, control wall, door light beam, ceiling decoration top and other components.

The material is generally 1.0 ~ 2.0mm stainless steel plate or cold-rolled carbon steel plate, processing technology The route is generally cutting by a shearing machine, then punching or punching directly by laser, and finally bending and forming.

In the bending process, in order to ensure product quality, it is necessary to set extreme values such as the minimum bending radius, the minimum bending straight edge, and the minimum hole edge distance. Different plates have different minimum bending radii due to their different elongation rates.

The minimum bending straight edge refers to the distance from the boundary of the sheet to the bending edge. If its length is too small, it may cause bending deformation and even damage the mold. The distance is generally h> 2t.

Hole margin refers to the process route of punching first and then bending. If the position of the hole is in the bending deformation zone, the hole will deform during bending. When t ≤ 2mm, the hole margin S ≥ t+r; when t ≥ 2mm, the hole margin S ≥ 1.5t+r.

The bending sequence of the CNC press brake

When formulating the bending process route, the bending sequence is also an important content. Improper bending sequence may cause a large deviation in the forming size of the part, and even interference may cause the bending to be impossible.

In the bending process, the following four basic principles are generally followed: ⑴Bending from the inside to the outside; ⑵Bending from small to large; ⑶Bending special shapes first, and then bending general shapes; The process has no influence or interference.

Common problems and solutions in bending

The forming size does not match the drawing

The main reasons for the inconsistency of the workpiece forming size with the drawing are the error of the cutting size, the inaccurate bending positioning and the cumulative error of multiple bending.

The solution is: adjust the bending coefficient, recalculate the unfolded size; adjust the positioning; select a reasonable positioning benchmark to eliminate the accumulated error. If the cutting size error and the bending cumulative error are within the allowable range, the forming size can be guaranteed first, and the error can be accumulated on the non-assembly side that has no effect on the workpiece.

Bending angle deviation

The bending angle of the workpiece is too large or too small to cause bending angle deviation, mainly due to improper V port of lower die, improper setting of die springback compensation parameters, and mismatch of press brake pressure.

The solution is: refer to the bending mold table to select the appropriate lower mold, adjust the rebound compensation value and the pressure of the bending machine.

Cracks on the bending edge

The main reasons for the cracks on the bending edge include too small bending radius, parallel plate texture and bending line, blank burrs facing outward, and poor material plasticity.

The solution is to increase the bending radius and use a high-precision CNC bending machine or grooving; change the opening and layout direction of the workpiece; change the direction of the burr and place it on the inner corner of the workpiece; replace the plastic more Good material.