Industry trends

Main contents of mechanical assembly

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    Mechanical products are generally made up of many parts and components. According to the required technical requirements, the parts and parts are cooperated and connected to make it a semi finished or finished process, called assembly.
Assembly is the last stage of mechanical manufacturing process. It occupies a very important position in the manufacturing process of mechanical products. The quality of assembly work has a great impact on product quality. Although the quality of parts is the basis of product quality, but the assembly quality is not good. Even if there are high-quality parts, there will be products of poor quality or even unqualified. Therefore, it is necessary to attach great importance to the assembly of the products.
Assembly work is not simply to connect qualified parts, but according to the technical requirements of assembly, assembly and assembly at various levels, through calibration, adjustment, balancing, matching and repeated testing, to ensure the quality of products is qualified. Assembly order should also be followed, first and later, first inside and outside, first difficult and easy, the first precision after the general, the first weight and then light principle.
The assembly process of mechanical products can be divided into 3 stages.
1. preparation before assembly
Preparation before assembly is the first step in the assembly of mechanical products, and the details are as follows:
(1) be familiar with products, including parts, components, assembly drawings, assembly process documents, and product quality acceptance criteria. Analyze the structure of products (including components and components), understand the connection relationship between parts and assembly technology requirements.
(2) determine the order and method of assembly, and prepare the necessary assembly tools.
(3) required for the assembly of parts, cleaning, oil removal and unsealing.
2. assembly
According to the complexity of the product structure, the assembly work can be divided into component assembly, component assembly and general assembly.
Assembly: the process of connecting a number of parts into components or connecting parts and components into more complex components. For example, the assembly of a transmission shaft (shaft and shaft) in the spindle box of a lathe.
> component assembly: the process of connecting parts and components into parts. For example, the assembly of a lathe spindle box, a feed box and other components.
General Assembly: the process of assembling a number of parts and parts into the final product. For example, complete assembly of machine tools, cars, steam turbines, etc.
3. adjustment, accuracy test and test car
After the assembly, it needs to be adjusted, precision test and test operation to ensure the quality of the product.
Adjustment: it refers to the adjustment of the tightness of the combination of parts or mechanisms, the coordination of the clearance and the precision of each other, so that the products can work in a coordinated manner. The common adjustment has the adjustment of the bearing clearance, the adjustment of the position of the insert, the adjustment of the axial position of the worm wheel and so on.
Accuracy test: including the geometric accuracy test and the work precision test. The former mainly checks the precision of the static time of the product.
Such as the parallelism of the lathe spindle axis and rail bed test, tailstock spindle center and high test, slide and axis perpendicularity test; the latter mainly check the precision of products in the working condition, for the machine, especially the cutting test, such as pitch accuracy test, the process of turning the outer thread the circle roundness and cylindricity inspection, the inspection turning end surface flatness.
Test: when the machine is assembled, the running test is carried out according to the design requirements. The test car is used to check the flexibility, work, lift, sealing performance, vibration, noise, speed and output power of the product to meet the design requirements. The test car includes the air transfer test, the load test and the overload test.

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