How to calculate the clamping force of the fixture of the draw k
Publish: 2021-05-07 07:12:02
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. Broaching machine is a kind of machine tool which uses broach to process various internal and external forming surfaces of workpiece. Broaching machine tool only broach linear motion, it is the main movement of the processing process, feed movement depends on the broach structure to achieve. According to the different nature of work, broaching machine can be divided into internal broaching machine and external broaching machine. Broaching machine is generally hydraulic transmission, it has only the main movement, simple structure.
8. The clamping force of fixture needs to consider several aspects: cutting force, acceleration force of workpiece movement (straight line or rotation), stiffness. The specific calculation also depends on the fixture structure, stress direction, etc.
9. Draw by yourself and try to calculate. But this estimate can't be calculated statically, unless we assume that the two yellow forces are equal. But it seems to be OK, because the yellow one has two forces.
10. It is mainly the calculation of the clamping force when drilling holes on the special fixture when processing holes on the milling machine. If you know something, please give me some suggestions or tell me what website or information you can find relevant calculation
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