Let's start with two facts:

First, any part has manufacturing errors, and tolerance is the inherent DNA of the part.

Second, due to manufacturing errors, assembly will inevitably lead to the deviation between parts and theoretical positions, thus affecting product quality, assembly efficiency, cost, cycle and ………………………………………………………………………………………………………………………………………………………………………………………!

Mobile phone is a product that everyone can't live without. Take the mobile phone as an example!

The assembly gap between parts greatly affects the look and feel of the mobile phone, especially the gap between the screen and the frame! If it is uneven, the force on the mobile phone will suddenly become lower. If you don't feel it, think about the phone film. If the film is a little crooked, will it affect the use? But others can see at a glance that the paste is terrible, right? !

Let's talk about cars.

After the automobile hood and other parts are assembled, the gap should not be too large first, otherwise it will be ugly, which is to ensure the manufacturing accuracy. Secondly, the gap should be uniform, otherwise it will be ugly, which is mainly ensured by assembly.

A few years ago, the 2mm project in the automobile industry was to solve this problem.

The United States originally claimed to be a country on wheels, and the automobile manufacturing industry was very developed. However, after Japan firmly suppressed this gap, the automobile industry was in a slump. Later, under the auspices of Professor Wu Xianming of the University of Michigan, this technology made a breakthrough in a relatively short period of time, and the American automobile industry recovered a little.

The 2mm project in China was carried out by Academician Lin Zhongqin of Jiaotong University. As long as the University of Michigan does research, Jiaotong University will follow up as soon as possible. Therefore, China's academic innovation ability. ...

Back to the plane assembly. Aircraft assembly is not generally high!

For example, the boarding gate of the plane should be sealed!

Aircraft assembly refers to assembling a large number of aircraft parts into assemblies, plates, segments and parts in a certain combination and order, and finally docking all the parts into a complete aircraft body. Engine, instrument, control system and various accessories, devices and special equipment should be installed on the machine body step by step.

Aircraft assembly can be divided into component assembly and final assembly.

The problems to be solved in aircraft parts assembly are: according to the requirements of structure, use, maintenance and production, the aircraft structure is divided into many independent smaller structural assembly units, and then they are assembled into complex assemblies in turn through reasonable assembly technology and corresponding assembly tools; Plan a reasonable assembly positioning method, determine the correct mutual position of parts, components and segments, and ensure the accuracy requirements of the size and shape of the whole assembly unit; Select appropriate connection methods and process parameters, such as riveting, screwing, gluing or welding, so as to keep the mutual position of parts accurate and firm, form a stable overall structure or have a mechanism to determine relative motion, and effectively transfer loads and perform motion conversion.

Aircraft assembly is the continuation of the component assembly process and the last stage of aircraft assembly work. The task of aircraft assembly is to connect all sections and components handed over by the component assembly workshop into a complete aircraft according to the requirements of aircraft drawings, technical conditions and production instructions, install engines, various instruments, equipment and accessories provided by various professional factories on the aircraft, and connect them into a system with various conduits, cables and pull rods for adjustment, test and inspection. Finally, the plane will be sent to the factory test flight workshop for ground and air test flight.

Aircraft assembly includes the following tasks:

Docking and leveling of aircraft fuselage components;

Install test fuel tank and fuel and lubricating oil system;

Install and adjust the engine and control system;

Installation, laying and testing of equipment, accessories and conduits of hydraulic and air-conditioning systems;

Installation, adjustment and testing of landing gear, its retraction mechanism and signal system;

Installation and adjustment of aircraft control system;

Installation, laying and testing of electrical, communication, instrumentation and cables;

Installation and testing of high-altitude lifesaving equipment;

Installation and testing of special equipment.

Yes, you saw those "XXX seconds watching the aircraft manufacturing process" on the Internet, but in fact you only saw a small part of the aircraft assembly! It is mainly the transportation and docking process of large pieces.

Relatively speaking, for aircraft assembly, component assembly technology is actually the core technology, and you can't visit component assembly in Boeing.