Calculate bending force

1.

Approximate calculation formula of bending machine pressure: P = 650ssl / V

P: bending machine pressure (KN)
L: plate width (m)
s: plate thickness (mm)
V: lower die opening (mm)

reference data: Bronze (soft): 0.5p stainless steel: 1.5p
Aluminum (soft): 0.5p chromium molybdenum steel: 2.0P

2.

Bending force calculation formula: P = 650 × S × S × L / V (tensile strength = 450N / mm ~ 2)

P -- bending force (KN)

s -- plate thickness (mm)

L -- plate width (m)

V -- lower die groove width (mm), generally 8 times of plate thickness. For more than 10 thick plates, V is usually 10 times the thickness of the plate

under the pressure of the upper die or the lower die of the bending machine, the sheet metal first goes through elastic deformation, and then enters into plastic deformation. At the beginning of plastic bending, the sheet metal is free bending

with the pressure of the upper die or lower die on the sheet metal, the sheet metal and the inner surface of the V-shaped groove of the lower die are graally close, and the curvature radius and bending arm are graally smaller. Continue to press until the end of the stroke, so that the upper and lower die and the sheet metal are close to each other at three points, and a V-shaped bending is completed

extended data:

large fillet should be made at sharp bend to prevent folding ring final forging. There should be two fulcrums on the lower die to support the blank before bending. The height of these two points should enable the blank to be placed horizontally

When the blank is bent in the die groove, the control position of the stop table should be made at the end of the bending die groove. Transverse arc pits should be made on the protruding part of the die groove for the positioning of the blank. The depth of the pits is HL ~ (0.1 ~ 02) H (H is the depth of the corresponding part of the die groove). The die groove should have a proper slope, so that the blank can be easily taken out from the die groove after bending and the operation is convenient

3. ? don't get it.... If you are using the corresponding cutter and lower die of the bending machine on the bending machine, there is one in the manual of the bending machine; If it is your design of the die or other, then before the design of these data calculated, specific you refer to the mold design.

4. First of all, it is necessary to distinguish several types of beams, such as rectangular beam, T-beam, I-beam, box beam and so on. Then these beams are divided into single reinforced beam and double reinforced beam. Single reinforced beam is only in the concrete tension zone configuration tension reinforcement, to bear the stress caused by bending moment, double reinforced beam is in addition to the tension longitudinal reinforcement, but also in the concrete compression zone configuration compression reinforcement. So their calculation methods are different. Take a rectangular beam with single reinforcement as an example: its bearing capacity can be calculated by two balance formulas of the section. One is the balance of horizontal force, that is, the pressure in the compression area of concrete is equal to the tensile force of the tensile steel bar. The other is moment balance, that is, the moment of tensile reinforcement or the moment of compression zone center. After the calculation, the height of the compression zone and the reinforcement ratio should be checked. The essence is to prevent the damage of over reinforcement and less reinforcement. The formula is not listed, and it is meaningless to list it. You can do it yourself. Ha ha, buy books or standardize!

5. This is a good example. http://jpkc.cec.e.cn/jpkc/skgyzb/wlkj/7-23.htm

6. Ha ha, manual folding machine, the pressure is about 37% of ordinary bending machine.

7.

40t / 2200 or 63T / 2500 is OK. 40t / 2200, 37000, 63T / 2500, 50000

formula: tensile strength × Square of plate thickness × Bending length ÷ Width of lower die × 1+4 × Plate thickness Z ÷ Width of lower die) = required pressure (unit: KN)

tensile strength Al: RM = 200-300

MS: RM = 370-450

SS: RM = 650-700

so the required pressure of bending machine is: 450 × three × three × one point two ÷ eighteen × 1+4 × three ÷ 18) In the beginning of plastic bending, the sheet metal is free bending. With the pressure of the upper die or the lower die, the sheet metal will undergo elastic deformation, and then enter into plastic deformation, The sheet metal and the inner surface of the V-groove of the lower die are graally close, and the curvature radius and bending arm are graally smaller. Continue to press until the end of the stroke, so that the upper and lower die and the sheet metal are close to each other at three points. At this time, a V-bending is completed, which is commonly known as bending

8. Length (m) multiplied by the square of material thickness multiplied by 650 divided by the following die V groove divided by 9.8

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10. It is discussed in detail in mechanics of materials. It is mainly to calculate bending moment, torque and so on. It's a lot of trouble to calculate the moment of inertia.