Regarding the coupling bolt itself, the primary factor influencing the preload force is its structural dimensions. The current design of the coupling bolt is based on structural data from earlier domestic and international units, combined with existing manufacturing processes. However, due to the use of a countersunk structure, the thread size that can be matched with the nut is limited, and it cannot be made too large. Additionally, during the manufacturing process, a groove or undercut is required, which becomes a critical factor limiting the pre-tightening force of the coupling bolt.
The presence of significant stress concentration in the undercut area means that the pre-tightening force cannot be increased arbitrarily. Currently, the pre-tightening force of the coupling bolt is determined by ensuring that the maximum tensile stress in the bolt does not exceed 300 MPa (originally set at 250 MPa). Therefore, if we want to increase the pre-tightening force, it is necessary to increase the minimum diameter of the bolt at the undercut section.
The preload force of the coupling bolt should be carefully controlled to ensure an adequate level of tightening while also meeting the strength requirements of the bolt. To guarantee accurate elongation measurement, the length of the bolt should be measured after installation in the wheel hole, and the positioning of the bolt before and after the measurement must remain consistent to reduce measurement errors.
If the reaming accuracy of the bolt holes in the coupling is poor, the clearance between the bolt and the hole will be excessive. When the tightening force is insufficient, relative rotation between the coupling components may occur, leading to increased shaft vibration and potential mechanical failure over time.
It's important to note that the overall performance of the coupling system relies heavily on both the design of the bolts and the precision of the installation process. Proper attention to these details ensures long-term reliability and safety in mechanical applications.
Aluminum Precision Turned Parts
1. The hardness of the material is moderate, and the tool wear of the machining equipment and CNC machining center is small.
2. It can be precisely machined into various geometric shapes such as plane, cavity, shell, sphere, arc, and anisotropy.
3. It is not easy to stain and maintain. Aluminum precision parts, precision parts processing, CNC processing
4. It has good durability and is not easy to corrode. With special treatment process, the service life of parts is longer.
5. Aluminum is environmentally friendly and can be 100% recycled, with high recycling value.
The above five points are the material characteristics of aluminum products. Aluminum is a common material in CNC precision parts processing, with moderate hardness, durability and corrosion resistance. In addition, the cost of materials is appropriate. It is the preferred material for most parts manufacturers.
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