How to calculate the center of blanking force
Publish: 2021-05-01 00:35:57
1.
The blanking force of the stamping is 1.3 factor X (34 + 34 + 132 + 82 + 27 + 47 + 82 + 20), perimeter x 2, material thickness x 310, stress = 37 tons
2. Calculation method of blanking force:
P = FLT σ B
where f is the empirical coefficient, generally 0.6-0.9; L is the length of the trimming line, mm; T is the sheet thickness, mm; σ B is the shear strength of plate, MPa
refers to the maximum resistance of the material to the die ring blanking.
P = FLT σ B
where f is the empirical coefficient, generally 0.6-0.9; L is the length of the trimming line, mm; T is the sheet thickness, mm; σ B is the shear strength of plate, MPa
refers to the maximum resistance of the material to the die ring blanking.
3. Calculation formula of punch pressure P = KLT Г
where: K is the coefficient, generally equal to 1,
L is the circumference of the proct after stamping, in mm
t is the material thickness, in mm< br /> Г It is the shear strength of the material. Unit MPa
the calculated result is the unit of Newton. After dividing the result by 9800n / T, the result is the number of T.
this can only be calculated roughly. For the sake of safety, multiply the above value by 2, so the calculated value also conforms to the punching force calculation formula of compound die
P = k * L * t* τ
P flat edge blanking force (n)
tmaterial thickness (mm)
L blanking perimeter (mm)< br /> τ Material shear strength (MPA); K safety factor is generally k = 1.3.
calculation formula of punching shear force
F = s * L * 440 / 10000s workpiece thickness l workpiece length generally, this formula can be used
the punching pressure refers to the minimum pressure that the
press should have ring blanking
P stamping = P blanking + P unloading + P pushing + P blank holder force + P drawing force
the punch force is to select the tonnage of the punch press to determine the die strength. Stiffness check basis
1? Blanking force and its influencing factors: the main factors influencing the blanking force are as follows:
2. Calculation of blanking force P = Lt σ B
where p blanking - blanking force L - peripheral length of blanking part T - sheet thickness σ B-material strength limit σ The unit of result is kn
3? The force to unload the workpiece or scrap from the punch PX = kxp
where the reference number of KX - unloading force coefficient KX - is 0.04, and the calculated result unit is kn
4? The force to push the workpiece or scrap out of the die along the blanking direction Pt = ktpnkt - pushing force coefficient n - the number of pieces left in the die hole
where: K is the coefficient, generally equal to 1,
L is the circumference of the proct after stamping, in mm
t is the material thickness, in mm< br /> Г It is the shear strength of the material. Unit MPa
the calculated result is the unit of Newton. After dividing the result by 9800n / T, the result is the number of T.
this can only be calculated roughly. For the sake of safety, multiply the above value by 2, so the calculated value also conforms to the punching force calculation formula of compound die
P = k * L * t* τ
P flat edge blanking force (n)
tmaterial thickness (mm)
L blanking perimeter (mm)< br /> τ Material shear strength (MPA); K safety factor is generally k = 1.3.
calculation formula of punching shear force
F = s * L * 440 / 10000s workpiece thickness l workpiece length generally, this formula can be used
the punching pressure refers to the minimum pressure that the
press should have ring blanking
P stamping = P blanking + P unloading + P pushing + P blank holder force + P drawing force
the punch force is to select the tonnage of the punch press to determine the die strength. Stiffness check basis
1? Blanking force and its influencing factors: the main factors influencing the blanking force are as follows:
2. Calculation of blanking force P = Lt σ B
where p blanking - blanking force L - peripheral length of blanking part T - sheet thickness σ B-material strength limit σ The unit of result is kn
3? The force to unload the workpiece or scrap from the punch PX = kxp
where the reference number of KX - unloading force coefficient KX - is 0.04, and the calculated result unit is kn
4? The force to push the workpiece or scrap out of the die along the blanking direction Pt = ktpnkt - pushing force coefficient n - the number of pieces left in the die hole
4. Calculation formula of punch pressure P = KLT Г
Where: K is the coefficient, generally equal to 1,
5. The calculation method of blanking force:
the blanking force is not less than the cutting force of cutting workpiece + pressing and returning force
cutting force = shear strength of material * cross-sectional area
taking a circle with a diameter of 100 mm cut on a 3 mm thick Q235 steel plate as an example, the calculation method is as follows:
cutting force of steel plate = 350 n / square mm * 3.14 * 100 * 3 = 329700 n
blank holder Return force: estimated 80000 n
press pressure: 32900 + 80000 = 409700 n
selected press: 63 t press
the blanking force is not less than the cutting force of cutting workpiece + pressing and returning force
cutting force = shear strength of material * cross-sectional area
taking a circle with a diameter of 100 mm cut on a 3 mm thick Q235 steel plate as an example, the calculation method is as follows:
cutting force of steel plate = 350 n / square mm * 3.14 * 100 * 3 = 329700 n
blank holder Return force: estimated 80000 n
press pressure: 32900 + 80000 = 409700 n
selected press: 63 t press
6. The pressure center is the geometric center and the center of mass of the part. According to the center of mass, the origin of the stamping coordinate system is established. The Z axis is the central axis of the die handle. After that, the die parts are arranged and the building blocks are set up
now we don't need to calculate according to the book. General 3D software such as CATIA has the function of automatically finding the center of mass. If we calculate according to the formula in the book, the irregular surface parts will be half dead....
now we don't need to calculate according to the book. General 3D software such as CATIA has the function of automatically finding the center of mass. If we calculate according to the formula in the book, the irregular surface parts will be half dead....
7.
P=f Lt σ B
where f is the empirical coefficient, generally 0.6-0.9; L is the length of the trimming line, mm; T is the sheet thickness, mm; σ B is the shear strength of plate, MPa
8. Hello, the physical examination center is good. They are specialized in physical examination, with higher authority.
Hot content