What is the general tightening accuracy of a tightening machine in automobile manufacturing?

Tightening accuracy of Dalian tightening machine in automobile manufacturing

In automobile manufacturing, the tightening accuracy of tightening machines varies depending on specific application scenarios, equipment grades, and tightening process requirements.

1、 General accuracy range

Torque accuracy

For general automotive component assembly, such as body interior parts, non critical chassis components, etc., the torque accuracy of the tightening machine can usually reach ± 3% - ± 5%. This means that if the set target torque is 100N · m, the actual tightening torque will be within the range of 95N · m-105N · m (± 5%) or 97N · m-103N · m (± 3%). This precision can meet the basic requirements of these components for connection tightness, ensuring that screws will not easily loosen during normal vehicle operation.

Angle accuracy

In some situations where the tightening angle needs to be controlled, such as tightening nuts or bolts with self-locking function, the angle accuracy of the tightening machine can generally reach ± 1 ° - ± 3 °. For example, when tightening certain engine bracket bolts, precise control of the tightening angle is required to ensure effective self-locking function, and angle accuracy becomes particularly important at this time.

2、 High precision requirements for key components

Engine and transmission assembly

For the assembly of core components of automobiles, such as engines and transmissions, the precision requirements for tightening machines are higher. The torque accuracy can usually reach ± 1% - ± 2%. This is because the internal structure of the engine and transmission is complex, the working environment is harsh, and they are subjected to high temperature, high speed, and high torque. If the screw tightening accuracy is not sufficient, it may lead to loose parts, poor sealing, and even mechanical failure. For example, the tightening accuracy of engine cylinder head bolts is very high. Once loosened, it can cause coolant or oil leakage, seriously affecting engine performance.

The angle accuracy is also correspondingly improved in these key areas, reaching ± 0.5 ° - ± 1 °. Especially for bolts with yield point control tightening, precise angle control can ensure better pre tightening force, thereby ensuring the reliability and safety of the connection.

Assembly of safety critical systems

In the assembly of safety critical systems in automobiles, such as braking and steering systems, the torque accuracy of the tightening machine is also required to be around ± 1% - ± 2%. Because these systems are directly related to the driving safety of vehicles, any loose screws may cause serious safety accidents. For example, insufficient tightening accuracy of brake caliper bolts may cause the brake caliper to loosen, affecting braking performance.

The angle accuracy is also maintained at a high level, generally ± 0.5 ° - ± 1 °, to ensure the assembly quality of key safety components and ensure that these components can work stably and reliably during vehicle operation.

The tightening accuracy of Dalian tightening machine in automobile manufacturing varies depending on different assembly parts and requirements, but overall it can meet the high-quality and reliability requirements of automobile component assembly. With the continuous development of automobile manufacturing technology, the requirements for tightening accuracy of tightening machines are gradually increasing, and Dalian tightening machine manufacturers are also constantly improving their technology to provide more accurate and stable tightening equipment.