How to calculate the required clamping force
Publish: 2021-05-19 12:18:41
1.
the key is the torque coefficient. With the same thread specification, the torque coefficient of different surface treatment is different, and some even differ by one time. Therefore, it is not appropriate to calculate the torque according to 0.12 in some manuals or standards. The torque coefficient shall be obtained by test. The torque value of bolt is shown in the figure below. Hope to be able to help you, thank you
Hello, how to calculate the torque value of nut and bolt
The calculation formula is: tightening torque = torque coefficient × Preload × Nominal diameter of threadthe key is the torque coefficient. With the same thread specification, the torque coefficient of different surface treatment is different, and some even differ by one time. Therefore, it is not appropriate to calculate the torque according to 0.12 in some manuals or standards. The torque coefficient shall be obtained by test. The torque value of bolt is shown in the figure below. Hope to be able to help you, thank you
2.
fn=bar x am² X 1051 bar = 10 N / cm & # 178
3. The formula t = KFD, K is the tightening torque coefficient, f is the preload, D is the nominal diameter of the thread
the bolt manufacturer will give certain parameters, and the torque corresponding to the bolt shaft tension can also be determined by test, which requires the use of torque meter, bolt shaft force meter and other experimental equipment
for this kind of situation, in actual operation, the torque wrench that has been accurately calibrated is generally used for tightening. For example, in the process of tightening bolts, if the manual torque wrench reaches the predetermined torque value, it will make a sound to remind workers to stop
for the error range you mentioned, I checked the data. When the torque wrench used for construction is calibrated, the allowable error shall not be greater than the torque value used ± 5% The error of torque wrench for correction should be controlled within ± Within 3%
isn't the actual torque tolerance controlled by tool accuracy? If you calibrate the torque wrench according to 44nm, then the final applied actual torque will be around 44nm, and the error will not exceed 44nm ± 5% Since the tolerance of the tool is allowed in the specification ± 5% range, then it is considered whether there is too loose or twisting risk in this range.
the bolt manufacturer will give certain parameters, and the torque corresponding to the bolt shaft tension can also be determined by test, which requires the use of torque meter, bolt shaft force meter and other experimental equipment
for this kind of situation, in actual operation, the torque wrench that has been accurately calibrated is generally used for tightening. For example, in the process of tightening bolts, if the manual torque wrench reaches the predetermined torque value, it will make a sound to remind workers to stop
for the error range you mentioned, I checked the data. When the torque wrench used for construction is calibrated, the allowable error shall not be greater than the torque value used ± 5% The error of torque wrench for correction should be controlled within ± Within 3%
isn't the actual torque tolerance controlled by tool accuracy? If you calibrate the torque wrench according to 44nm, then the final applied actual torque will be around 44nm, and the error will not exceed 44nm ± 5% Since the tolerance of the tool is allowed in the specification ± 5% range, then it is considered whether there is too loose or twisting risk in this range.
4. Therefore, it is very important to further discuss the calculation formula of clamping force. The biggest characteristic of circular eccentric clamping is that the lifting angle u changes with the force Q, the distance r and the lifting angle U.
5.
Clamping force cutting force, to calculate the data to be reliable
this should at least determine whether the clamping force is appropriate, to have a rough scale
6. For example, when the wrench length is 190mm and the force is 15N, the force proced by the nut of M12 is about 1200n
7. On the basis of workpiece positioning, e to the large external force (mainly cutting force) on the workpiece ring processing, the positioning will be destroyed. At this time, it is necessary to apply clamping force on the workpiece to prevent the workpiece from moving. This is called clamping.
8. 1. The material of the workpiece is as9u3, and the machining allowance of the large plane is 1.5mm. The cutting force can be calculated according to the following formula according to reference [1]:
where: FZ --- milling force (n) AF --- feed rate per tooth (mm / R) aw --- milling width (mm) KFZ --- milling force correction coefficient d0 --- milling cutter outer diameter (mm) AP --- milling depth (mm) Z--- The number of milling cutter teeth determines the parameters: (1) the outer diameter of milling cutter d0 = 315mm 2) The number of milling cutter teeth z = 16 3) The feed rate of each tooth AF is the feed rate of the milling cutter to the workpiece when the milling cutter rotates one tooth: AF = VF / (Z · n) = 360 / (16 × The milling depth AP for end milling cutter refers to the dimension of the layer to be milled measured parallel to the axis of the milling cutter: AP = 1.5mm (5). The milling width aw for end milling cutter refers to the dimension of the layer to be cut measured perpendicular to the axis of the milling cutter: aw = 240mm (6). The correction factor KFZ is 1.6; According to the table, CF = 7750, XF = 1.0, YF = 0.75, UF = 1.1, WF = 0.2, QF = 1.3, FZ = 276.5n = 28KG (7). The safety factor determined by theoretical clamping force calculation: the total safety factor k = K1 · K2 · K3 · K4, K1 --- general safety factor; K1 is 1.7; K2 --- processing state coefficient; Because it is finishing, K2 is taken as 1; K3 --- tool passivation coefficient; K3 is 1.4; K4 -- intermittent cutting coefficient; K4 is 1.2; ∴ k＝1.7 × one × one point four × 1.2≈3 W＝k·p＝3 × 28kg＝84kg
where: FZ --- milling force (n) AF --- feed rate per tooth (mm / R) aw --- milling width (mm) KFZ --- milling force correction coefficient d0 --- milling cutter outer diameter (mm) AP --- milling depth (mm) Z--- The number of milling cutter teeth determines the parameters: (1) the outer diameter of milling cutter d0 = 315mm 2) The number of milling cutter teeth z = 16 3) The feed rate of each tooth AF is the feed rate of the milling cutter to the workpiece when the milling cutter rotates one tooth: AF = VF / (Z · n) = 360 / (16 × The milling depth AP for end milling cutter refers to the dimension of the layer to be milled measured parallel to the axis of the milling cutter: AP = 1.5mm (5). The milling width aw for end milling cutter refers to the dimension of the layer to be cut measured perpendicular to the axis of the milling cutter: aw = 240mm (6). The correction factor KFZ is 1.6; According to the table, CF = 7750, XF = 1.0, YF = 0.75, UF = 1.1, WF = 0.2, QF = 1.3, FZ = 276.5n = 28KG (7). The safety factor determined by theoretical clamping force calculation: the total safety factor k = K1 · K2 · K3 · K4, K1 --- general safety factor; K1 is 1.7; K2 --- processing state coefficient; Because it is finishing, K2 is taken as 1; K3 --- tool passivation coefficient; K3 is 1.4; K4 -- intermittent cutting coefficient; K4 is 1.2; ∴ k＝1.7 × one × one point four × 1.2≈3 W＝k·p＝3 × 28kg＝84kg
9. speed
10. Lack of working air pressure, (force direction, piston rod diameter)
4 kgf / cm2; 53 KGF
6 kgf / cm2; 117.81 KGF
4 kgf / cm2; 53 KGF
6 kgf / cm2; 117.81 KGF
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