Characteristics, Design, and Importance of Machined Parts

Machined parts are commonly known as sheet-metal components. Sheet metal refers to metal plates whose thickness is significantly smaller than their length. Due to their unique geometric shapes and relatively thin profiles, machined parts offer advantages such as minimal material consumption, lightweight construction, ease of cutting, and standardized forms.

The process characteristics and significance of machining: Machined parts are categorized into three primary processing techniques—blanking, forming, and joining. Based on these three methods, machining technology can be further divided into stamping, bending, and welding techniques, each with its own unique features. Traditional machining processes rely on cutting tools, while stamping and bending operations utilize dedicated stamping dies and bending dies, respectively. In contrast, the welding process employs specialized welding equipment along with precise positioning fixtures to ensure accurate and reliable welds. ， Different processing methods require different manufacturing processes. For designers who have long been engaged in traditional machining of structural components, it is particularly important to shift their design mindset, carefully consider the limitations of sheet metal processing equipment and tooling on sheet metal designs, and integrate sheet metal technology into the development of innovative sheet metal structures.

Misconceptions and Optimization in Structural Design of Machined Parts: The structural design of machined parts should primarily consider the requirements and characteristics of sheet metal fabrication processes. Additionally, it’s important to take into account factors such as batch size, manufacturing costs, and production efficiency in sheet metal processing. Since designers often have extensive experience in mechanical machining structure design, there are frequently certain misconceptions that arise in the process of designing machined parts' structures.

Strength Design for Machined Components: Since designers cannot easily deviate from the conventional design approach for mechanically processed structural parts, they often resort to blindly increasing the thickness of sheet metal components in an attempt to enhance their design strength—yet this approach fails to leverage the stamping and bending processes that could actually optimize structural integrity. When designing a sheet metal product, it’s advisable to select materials of uniform thickness whenever possible, as this strategy significantly benefits material preparation, machining, and welding procedures. Additionally, incorporating stamped bosses and rolled ribs can dramatically boost overall strength. During the structural design phase of sheet metal parts, stress analysis should be conducted to identify stress concentration points and critical cross-sections within the component. Critical areas subjected to high stress should be reinforced with raised bosses, while hazardous cross-sections can be strengthened using ribs. Moreover, cold-forming techniques like bending and die pressing can effectively double the local material thickness—resulting in a strength far greater than simply doubling the material thickness across the board.

Optimized Design for Machined Components: Machined parts intended for welding often require tedious welding and grinding processes, resulting in low machining efficiency and inconsistent surface quality. Therefore, by refining the design—without compromising structural integrity—we can minimize the number of welded areas, enhancing both the aesthetic appeal and the overall surface quality of the components.

The design of right angles within square holes in machined parts: Since cylindrical cutting tools—specifically milling cutters—are used in machining processes, the parts being processed typically feature two rounded corners. For stamped sheet metal components, forming dies are employed to create the square shapes. L The die is rectangular or square, and the rear hole is stamped into an internal right angle in one operation. Therefore, when designing, the square holes in the sheet metal part must be shaped with internal right angles. Based on the product performance requirements and an understanding of the dimensions of the factory’s existing molds, processing should be carried out using these standard tools during sheet metal fabrication—this approach helps reduce manufacturing costs and prevents the need for time-consuming, custom tooling that could extend the production cycle.