The process route of hardware part machining is a systematic sequence of operations that ensures precision, efficiency, and quality in manufacturing. Understanding this route is crucial for producing high-performance hardware components that meet industrial standards.​

First and foremost, machining the datum surface takes priority. In the machining process of hardware parts, the surface used as the positioning datum must be processed first. This is known as the “datum first” principle. The datum surface serves as a reference for subsequent machining steps, providing an accurate and stable base to ensure the precision of other surfaces. By processing the datum surface early, manufacturers can avoid errors caused by unstable positioning in later stages, laying a solid foundation for the entire machining process.​

Next, dividing the machining stages is essential, especially for surfaces of hardware parts that require high quality. Typically, the machining process is divided into three main stages: rough machining, semi-finishing, and finishing. Rough machining focuses on removing a large amount of excess material from the blank quickly, improving processing efficiency while preparing the blank for subsequent stages. Semi-finishing further refines the shape and size of the part, reducing the machining allowance for the finishing stage. Finishing, the final step in this phase, achieves the required precision, surface roughness, and dimensional accuracy of the part. This division of stages not only guarantees machining quality but also allows for the rational use of equipment—rough machining can be done on general-purpose machines, while finishing requires high-precision equipment. Additionally, it facilitates the arrangement of heat treatment processes, which can be inserted between different stages to improve the mechanical properties of the part. Moreover, dividing stages makes it easier to detect defects in the blank, such as cracks or inclusions, early in the process, preventing unnecessary waste of time and resources.​

Another important principle is machining planes before holes, particularly applicable to parts like boxes, brackets, and connecting rods. Processing the plane first enables manufacturers to use the plane as a positioning reference when machining holes. This ensures the positional accuracy between the plane and the holes, such as perpendicularity and parallelism. Furthermore, a flat and smooth plane provides a stable platform for clamping the part during hole machining, reducing vibrations and improving the quality of the holes. It also simplifies the setup of machining tools, making the hole-drilling, reaming, or tapping processes more efficient and accurate.​

Finally, the finishing processes for key surfaces, such as grinding, honing, and precision grinding, should be carried out at the final stage of the process route. These processes are designed to achieve ultra-high precision and a smooth surface finish. If they are performed earlier, the finished surfaces may be damaged during the transportation and installation of the part in subsequent . For example, scratches or dents on the surface can affect the part’s performance, such as its sealing or wear resistance. By placing finishing processes at the end, manufacturers ensure that the key surfaces remain intact and meet the highest quality standards.​

In summary, following this scientific process route is essential for producing high-quality hardware parts, as it optimizes precision, efficiency, and reliability throughout the manufacturing process.