Release time：2020-01-16 18:44 Browse：
Prioritize Standard Elements: Even if the screw needs to be longer, try to use standard head types (e.g., hex socket, pan head, flat head), standard thread specifications (e.g., M4, M5, M6), and standard pitches. Mold manufacturers have mature mold solutions for these standard components, which are far less costly than developing a completely new and unusual structure.
Adopt a "Reduced Shank" Design: If the structure allows, design the shank diameter (the non-threaded part) to be slightly smaller than the thread diameter. This not only saves material but, more importantly, significantly reduces the deformation resistance during cold heading, reduces mold wear, and may even allow production with fewer stations, thereby reducing the need for complex and expensive molds.
Avoid Unnecessary Complex Features: Adding special structures like knurls or grooves to the shank drastically increases mold complexity and cost. Avoid these unless functionally essential.
Provide Clear Technical Requirements, But Remain Flexible: Clearly communicate the functional needs of the screw (e.g., connection strength, material being fastened into, assembly space) to the supplier, not just the drawing dimensions. Experienced engineers might suggest more economical and producible modifications that still meet your functional needs.
Proactively Ask About "Similar Molds": Directly ask the supplier: "Do you have existing molds for similar specifications? Can my design be slightly adjusted to adapt to them?" This directly addresses the topic of "mold sharing."
Negotiate Tolerances: Appropriately loosen dimensional tolerances for non-critical areas. Extremely high precision requirements mean higher mold machining costs, more frequent mold maintenance, and lower product yield. A reasonable tolerance range effectively controls costs.
Obtain Detailed Mold Cost Quotations: Request suppliers to provide separate quotes for the unit price and the mold cost. Understanding the composition of the mold cost can sometimes be more economical than having it amortized into the unit price (especially for long-term, high-volume production).
Increase Order Quantity: This is the most direct method. Mold cost is a fixed expense; the larger the production quantity, the lower the mold cost allocated to each screw.
Consolidate Production for Product Families: As mentioned, if you need a series of products with different lengths in the future, try to produce them all at one supplier simultaneously or consecutively to maximize the benefit of your mold investment.
