First, the definition of pin
A pin is a type of cylindrical mechanical part, which is usually treated at both ends with chamferes or other shapes, and the middle part is a cylindrical shape of equal diameter. It is generally used to realize the connection between parts, positioning or as a rotating shaft and other functions.
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Second, the application of the pin
| Mechanical transmission field |
| In the transmission mechanism of various mechanical equipment, such as chain drive. The pin is an important part of the chain, and multiple chain links are connected through the pin to form a chain. In this application, the pin needs to have a high hardness and wear resistance to withstand the tension and friction of the chain during transmission. |
| Engineering machinery |
| In the working devices of construction machinery such as excavators and loaders, pins are widely used to connect boom, bucket rod and bucket components. For example, the boom and the bucket rod are connected through a pin, so that the bucket rod can rotate flexibly relative to the boom to achieve digging, lifting and other actions. Because these parts are subjected to large working loads, the strength and wear resistance of the pin are key factors to ensure the normal operation of construction machinery. |
| Automobile manufacturing |
| In the suspension system of the automobile, some connecting parts are connected by pins. For example, in some McPherson type independent suspension, the lower swing arm and the steering knuckle are connected through a pin, which can ensure a certain connection strength at the same time, so that the lower swing arm can swing flexibly within a certain range to adapt to the road bumps and steering needs of the vehicle during driving. |
| Aerospace field |
| In the landing gear structure of the aircraft, the pin is used to connect the various components of the landing gear, such as the shock absorber pillar, the wheel and other components. Due to the high reliability and safety requirements of the components in the aerospace environment, the materials, machining accuracy and quality control of the pins are very strict. |
| Furniture manufacturing |
| In some foldable furniture structures, pins are used to connect different furniture components so that the furniture can realize the folding function. For example, the legs of a folding chair and the seat surface are connected by pins, and when folding is needed, the legs can be rotated around the pins to reduce the space occupied by the furniture. |
Third, the precision guarantee of CNC lathe in the processing of pin
1.Diameter precision control
The diameter accuracy of the pin directly affects the mating accuracy of the pin and the connecting parts. By precise programming, the diameter tolerance of the pin can be controlled within a very small range. For example, for some high-precision mechanical drives in the pin, CNC lathes can achieve ± 0.01mm or even higher diameter accuracy control, to ensure that the gap fit with the hole or interference fit meet the design requirements.
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2.Length precision control
CNC lathes can accurately process the length of the pin. In the process of machining, the length error of the pin can be controlled in a very small range by the precise feed control of the tool. For example, in the processing of the pin used in the automotive suspension system, the length accuracy error can be controlled within ±0.1 mm to meet the assembly requirements of the suspension system.
3.Cylindricity guarantee
In order to ensure the performance of the pin during assembly and use, cylindricity is a key indicator. CNC lathes can make the cylinder of the pin reach a very high level by using its high precision rotary motion and linear motion control ability. For example, in the processing of pins in the aerospace field, the cylindricity can be controlled within 0.005mm.
Fourth, CNC machine tool to improve the surface quality of the pin
1.Surface finish processing
CNC lathes can use different cutting parameters and tools to improve the surface finish according to the specific requirements of the pin. In some pin application scenarios that require a low coefficient of friction, such as pins in precision instruments, CNC lathes can process surfaces with surface roughness Ra values as low as 0.8μm or even lower, reducing the friction of the pin at work.
2.Surface texture processing
For some special requirements of the pin, the CNC lathe can also process a specific surface texture. For example, in the case of increasing the friction between the pin and the connector, regular textures such as micro-pits or spirals can be processed to improve the stability of the connection.
Five, CNC lathe processing pin special structure
1.End structure processing
The end of the pin usually has chamfering, rounded corners or special shape processing requirements. CNC lathes can easily achieve accurate machining of these end structures. For example, in the processing of pins for construction machinery, the large chamfer at the end can be accurately machined by the tool path programming of CNC lathes to prevent scratching other parts during assembly.
For some pins with special end structures, such as the end with threaded holes or pin holes, CNC lathes can first process the cylindrical part, and then use its drilling and tapping functions to process the hole structure of the end.
2.Intermediate structure processing
If the middle of the pin needs to process oil grooves, keyways and other structures, CNC lathes can also be competent. Taking the processing of the oil groove as an example, the CNC lathe can precisely control the parameters such as the depth, width and spiral Angle of the oil groove according to the design requirements to ensure that the lubrication can be effectively carried out when the pin is working.
Key words: CNC lathe, special CNC lathe for pin machining, flat bed CNC lathe
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