In-Die Riveted Moving Contact Assembly
Products Description
This In-Die Riveted Moving Contact Assembly is a core conductive component in precision power electronics, formed by in-mold riveting of a high-precision stamped copper substrate and silver alloy contacts. It bears the main conductive circuit function of high-frequency switching of large currents and withstanding repeated mechanical shocks and thermal cycles. Unlike post-processing separate riveting solutions, it employs an in-mold synchronous forming and riveting process, achieving integrated molding of the contacts and copper carrier structure. This ensures both conductivity, mechanical durability, and batch consistency, making it suitable for harsh automotive and grid-level power electronic operating conditions, guaranteeing long-term stable current-carrying capacity and reliable breaking action.
Product Structure Disassembly
Silver Alloy Contacts (Working Layer)
Made of AgSnO₂ or AgNi alloy material, cold-forged into a shank rivet shape. The contact head is the working surface, forming a conductive contact pair with the mating stationary contact in the closed state; the shank is the riveting deformation zone, which, after being deformed under pressure during the in-mold riveting process, forms a mechanical interlock with the fluid carrier. As the core functional unit of the entire Electrical Contact Assembly, the material composition and head geometry of this contact directly determine the contact pair's resistance to arc erosion and its continuity.
Copper Current Carrier (Structural and Conductive Layers)
Formed from T2 copper or copper alloy strip through high-speed stamping, this layer includes the contact riveting points, current conduction paths, elastic structures, mounting and positioning features, and lead-out terminals. The thickness and cross-sectional area of the current carrier are designed based on the rated current density and temperature rise limits. The current carrier design of these Silver Contact Riveted Copper Assemblies must balance conductivity and fatigue life; its elastic structure provides stable contact pressure to the contacts during repeated operation.
Riveting Interface
After the contact shank is upset by a riveting punch, a riveting joint is formed on both sides of the countersunk hole of the current carrier, achieving a permanent mechanical connection between the contact and the current carrier. The contact pressure at the interface is controlled by the riveting deformation to ensure the low resistance characteristics of the conductive interface. The long-term stability of this interface is a key indicator of the quality level of Electrical Contact Rivet Assemblies. Closed-loop monitoring of riveting parameters directly ensures the reliability and consistency of the interface.
In-Die Riveting Process Flow
Strip Feeding and Precision Blanking
After the copper strip is precisely positioned by a servo feeding mechanism, the carrier contour is blanked, the riveting holes are pre-punched, and the bending is pre-formed in the progressive die. The die uses carbide inserts and precision guide components to ensure pitch accuracy and cutting-edge fit clearance, creating the basic structure of Precision Stamped Riveted Contact Assemblies.
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Silver Alloy Rivet Supply
After being oriented and sorted by a vibratory feeder or linear feeder, the silver alloy rivets are precisely fed into the die riveting station by a robot or pneumatic mechanism. The interference fit between the rivet diameter and the carrier hole diameter is precisely calculated to ensure a tight radial fit after riveting. The core material is Silver Alloy Contact Riveting Parts.
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In-Die Riveting Forming
At the end of the stamping stroke, the upper die riveting punch presses down, pressing the rivet into the carrier hole and simultaneously upsetting or flanging the head, forming a mechanical interlock. The riveting force and stroke are precisely controlled by the die's limiting structure to avoid over-riveting or under-riveting, resulting in a one-piece Electrical Contact Riveting Assembly.
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Final Bending and Cutting
After riveting, the subsequent stations of the progressive die complete the final bending of the conductive arm, terminal forming, and separation of the product from the strip, completing the Copper Carrier Riveted Silver Contact Assemblies structure.
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Online Inspection and Sorting
Some production lines are equipped with a vision inspection system to perform 100% online inspection of riveting height, contact flatness, and terminal dimensions. Defective products are automatically rejected, ensuring consistency in the dimensions and riveting quality of batch Electrical Riveted Contact Sub-Assemblies.
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Frequently Asked Questions
What are the substantial differences in electrical performance between in-die riveting and step-by-step riveting?
In-die riveting utilizes the mold's guiding precision to ensure the concentricity of the rivet and carrier hole. Riveted contact terminal assemblies have higher contact end face flatness, a larger actual contact area when closed, lower contact resistance, and better long-term stability. Step-by-step riveting, due to secondary positioning errors, has a higher risk of contact tilting, which may lead to localized contact and abnormal temperature rise.
Do you support non-standard-sized Silver Bimetal Rivet Stamping Parts and custom special alloy formulations?
Yes. We have independent mold development capabilities and silver alloy contact production capabilities, and can customize contact materials, geometries, and carrier structures according to customers' electrical specifications (rated voltage, current, load type) and mechanical interface requirements.
Will the riveted parts of In-Die Riveting in Metal Stamping loosen after long-term operation?
In-mold cold heading and riveting form an interference fit metallurgical interface. After millions of on-off cycles, the riveted parts will not loosen or fall off.
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In-die cold heading riveting forms an interference fit metallurgical interface. After millions of on/off cycles, the riveted parts will not loosen or fall off. From an engineering perspective of optimizing overall relay performance, the material and process selection for In-Die Riveted Moving Contact Assembly directly impacts system-level temperature rise management, lifespan prediction, and reliability metrics. We invite you to engage in technical discussions regarding your specific application conditions and performance objectives to determine the most suitable product solution.
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