Which torque wrench is better for inspecting assembled bolts?

How about torque wrenches? This question cannot be generalized and should be analyzed according to your specific situation. Here is a brief introduction to the characteristics of torque wrenches for your reference.

Mechanical audio torque wrench, high precision, strong structure, easy to operate, ratchet head can be switched clockwise and counter-time, the number of ratchet teeth is 45 teeth accuracy: 3% (50n The number of teeth is 45 teeth Accuracy: 3% (50n The user can set it for 2 minutes without automatic shutdown, power-saving mode.

It can also be manually shut down, the screen has a backlight, suitable for bad light or overnight operations, battery capacity prompts, 4 x 5 A batteries, longer service life, pointer dial torque wrench, pointer dial torque wrench, intuitive reading, easy operation, accuracy: 3% (40n For more professional answers, please contact Shanghai Tiger Roar Power Tools, Product Service: Shanghai Tiger Roar Power Tools....

There are generally three ways to detect the bolts that have been tightened: 1. The peak method, which uses ordinary value wrenches such as pointer wrenches and electronic wrenches to obtain the peak value while moving the bolt, which is widely used in this method; 2. Residual torque method, this method is to find the real residual torque point, and at the same time will ignore the peak torque caused by the maximum static friction between the lower surface of the bolt and the workpiece, and the disadvantage of this method is that the performance requirements for the wrench are relatively high; 3. There are two ways to reverse loose torque, one is direct anti-loosening, detecting anti-loose torque, and the other is re-tightening to the initial position after re-loosening at a certain angle, so that the torque obtained can also be used as a quality evaluation torque.

In short, there is no definite relationship between the post-quality measurement of torque and the dynamic torque of the assembly at the time, but as long as the values of the two are stable and the divergence is small, then it means that there are no serious problems with the overall production and quality.

I don't agree with the upstairs "you can use a manual wrench, the general movable wrench is on the line, and the acceptance is not so strict", the acceptance is not so strict, why use high-strength bolts? Why use grades?

Generally, in the parts with special requirements, in order to ensure the connection strength, and with the corresponding strength level of bolts (generally marked on the drawings), the actual construction must reach the torque required by the drawings. Generally, torque wrenches can be used as long as they are within the torque range of the bolt.

You can use a manual torque wrench.

Torque wrenches, also known as torque wrenches, torque wrenches, and torque adjustable wrenches, are a type of wrench. According to the power source, it can be divided into: electric torque wrench, hydraulic torque wrench and hand torque wrench; Hand torque wrenches can be divided into: preset type, dial type and digital display type.

High-strength bolts can be divided into two types: torsional shear type and large hexagonal type, and the national standard torsional shear high-strength bolts are M16, M20, M22, M24, and now there are two kinds of non-national standard M27 and M30; The national standard large hexagonal high-strength bolts are M16, M20, M22, M24, M27, M30 and so on. Generally, the tightening of high-strength bolts must be first tightened and then finally tightened, and each step needs to have strict torque requirements.

You can use a manual wrench, a general movable wrench, and the acceptance is not so strict.

A manual wrench can be used. Set the torque and use it according to the specification.

Summary. Ordinary bolts need to be tested with a torque wrench during installation. Torque wrenches can help ensure that the bolt is tightened to avoid loosening or overtightening.

When installing bolts, the torque force can be accurately controlled by using a torque wrench to ensure that the bolt is tightened to the desired degree. This is important to ensure assembly quality and safety. Therefore, for ordinary bolts, it is very necessary to use a torque wrench test.

Ordinary bolts need to be tested with a torque wrench during installation. Torque wrenches can help ensure that the bolt is tightened to avoid loosening or overtightening. When installing bolts, a torque wrench can be used to accurately control the torque force with a blank potato to ensure that the deficit bolt achieves the required degree of tightness.

This is important to ensure assembly quality and safety. So, for ordinary bolts, it is very stupid to use torque wrench for testing.

I'm still a little confused, can you be more detailed?

It is important to test the bolt tightening force with a torque wrench to ensure assembly quality and safety.

Torque wrenches are divided into manual, electric, hydraulic and pneumatic from the drive form; The use mode can be divided into preset type and fixed value type; The structural form can be divided into digital display, mechanical (dial hands) and so on.

The first thing to use for locking bolts is to clarify the tightening torque of the bolt, and when the required tightening torque is determined, you can choose the torque wrench corresponding to the torque value for operation. It is worth noting here that the accuracy required for the torque value of the bolt and the environment in which it works, if the environment permits the high accuracy, you can consider choosing a torque wrench with digital display with audio alarm, and if the environment is noisy, you should choose a torque wrench with vibration alarm, etc. At present, the high-quality torque wrenches in the domestic market include Nuoba, FACOM, Würth, Qiangshengwei, etc., and the cost-effective ones are Qiangshengwei and Dongri.

First of all, if your nuts and bolts are ordinary thread meshing, such as M5-6H and M5-6H mesh for the gap fit, at this time the friction resistance is very small, you can twist by hand, this is if the torque wrench is meaningless to measure the torque, generally in order to prevent the fastener from loosening generally apply axial preload (generally a multiple of the tensile yield), generally according to the empirical data to know the optimal application of the preload corresponding to the torque value, At this time, when the torque is applied to the required value, the preload effect is achieved (for example, the electric wrench, which is very common in the factory, will automatically slip when it reaches a certain torque value);

Secondly, if your nut is a self-locking or high-lock nut, or the bolt is an irregular thread, you can't twist it by hand at first, then you need to use a torque wrench, when there is no axial preload during the tightening process, there will also be a larger torque value, and when there is gradually axial preload, the torque will increase more.

If it is an ordinary nut and bolt fit, the friction between the thread and the thread (small can be ignored) at this time, the force is equal to the action and reaction force, but when there is axial preload, the force of the bolt nut is the preload and the direction is opposite.

When the lock nut is matched with the bolt, the friction force at the beginning is very large, but when there is axial preload, the force of the bolt nut is the opposite direction of the preload.

Personal opinion, which can be analyzed from this point of view.

Friction is applied, but generally ignored.

To find the corresponding tightening tool, we must first determine how much torque you need, so that we can match the type. In addition, torque tools are not only electric and pneumatic, but also manual, if the torque value is not very large, in the following, you can choose manual, so that the detection or tightening can be vividly displayed. Electric and pneumatic are very expensive, especially pneumatic, manual is much cheaper, there are many brands on the market, to be expensive, there are Nuoba, Guidorui, cost-effective and cost-effective, there are strong victories, and the low ones are domestic Zhunda!

A torque wrench is a special tool used to measure the torque value of a bolt when it is tightened. It usually consists of a spring and a pointer that accurately measures the torsional moment of the bolt.

To measure the torque of a bolt with a torque wrench, you first need to ensure the accuracy of the wrench. This can be done by calibrating the wrench to a known torque value. Once the calibration is complete, it is time to start measuring the torque of the bolt.

First of all, connect the torque wrench to the stool to the bolt that needs to be measured, and make sure that the wrench is firmly connected to the bolt. Then, slowly rotate the wrench until the desired torque value is reached. The pointer points to the corresponding scale on the torsion dial.

It should be noted that in order to ensure the accuracy of the measurement, it should be avoided to continue rotating the wrench after the required torque value has been reached. In addition, the correct torque value should always be used to tighten the bolt to ensure the safety and reliability of the bolt.

In conclusion, the twist wrench is a very useful tool that helps workers to precisely control the torque value when tightening bolts. To measure the torque of a bolt with a torque wrench, you need to ensure the accuracy of the wrench and take care to avoid over-rotation.