Structural optimization and process improvement of Relay Armature pure iron plate stamping fixture
Apr 07, 2026
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In precision electromechanical products such as solenoid valves and relays, the relay armature, as a core moving component, directly affects the product's operational accuracy, lifespan, and sealing performance through its reliable connection with the push rod or pull rod. One common fixing method involves stamping multiple "punch points" into the side wall of the relay terminal armature, causing it to deform inward and engage with the internal push rod. This seemingly simple process actually places extremely high demands on the design of the stamping tooling. Traditional tooling suffers from problems such as small support area, unstable positioning, and uncontrollable stamping depth, which easily lead to cracking of the relay armature plate terminal, incomplete punching, or the need for multiple re-punching, seriously affecting production efficiency and product qualification rate. To address these issues, a new type of Electrician Pure Iron Armature stamping tooling has emerged, effectively solving the aforementioned pain points through structural innovation.
Limitations of Traditional Stamping Fixtures
Traditional fixtures typically consist of a fixed support and a separate punch. The support relies solely on a small shoulder surface (denoted as surface a) on the upper part of the relay armature as its support point. During stamping, significant local stress concentrates here, easily inducing microcracks in the armature relay body, especially for armature metal parts of relays made of high-strength steel or hard materials, where the risk is even higher. Furthermore, due to the lack of effective limit on the punch stroke, the operator relies entirely on experience and feel to control the punch depth. If the stamping is insufficient, secondary or even multiple additional punches are necessary, which not only reduces efficiency but also exacerbates workpiece damage due to repeated impact loads, creating a vicious cycle.
Structure and Principle of New Stamping Fixtures
To address the above problems, the new fixture adopts a design concept combining "clamping" positioning and "stroke limiting." Its core components include three parts: a separable positioning seat, a movable positioning sleeve, and a dedicated punch.
1. Split-Type Positioning Seat
The positioning seat is symmetrically divided into two halves along its centerline, holding the Armature for Electromagnetic Relay within it during use. A key improvement is the redesign, which shifts the primary support surface from the small upper surface (a) to a larger shoulder surface (b) in the center of the Relay Armature pure iron plate. This significantly increases the stress-bearing area, effectively dispersing the stamping reaction force and fundamentally reducing the risk of workpiece cracking due to stress concentration. The positioning seat features stepped through-holes to precisely guide the axial position of the Relay Armature Soft Magnetic Iron and ensure its stability during stamping.
2. Movable Positioning Sleeve
The positioning sleeve is a sliding annular sleeve that fits over the two halves of the positioning seat. Its main functions are twofold: first, to firmly bind the two halves together, maintaining the clamping force on the Relay armature plate; and second, to act as an axial limiter for the punch. The positioning sleeve also features stepped holes. When the punch descends to the predetermined position, a specific part of it contacts the inner step of the positioning sleeve, physically limiting further downward movement of the punch. This design ensures consistent punching depth for each stroke, achieving "one-time forming" and completely eliminating the need for additional punching.
3. Dedicated Punch
The punch employs a multi-segment coaxial structure, including a knurled connecting section for connection to the equipment, a guide section for guidance, and a punching section for performing the punching task. Multiple punching blocks are evenly distributed on the end face of the punching section, with its working surface designed as an inclined plane facing the central axis. This geometry helps the punching blocks generate radial force upon contact with the Relay Armature, more effectively promoting inward material flow to form a full punch point. The chamfered design of the guide section facilitates smooth entry of the punch into the positioning sleeve, reducing assembly errors.
Technical Advantages and Application Value
The core advantages of this new tooling lie in three aspects: high reliability, high consistency, and high efficiency. By increasing the support area, the workpiece breakage rate is significantly reduced; through mechanical limiting, the punching quality is stable and controllable; and through one-time forming, the production cycle time is shortened. These improvements have significant practical value for modern manufacturing industries pursuing zero defects and high automation, especially in high-end fields such as automotive electronics and aerospace.
Precision tooling is the cornerstone of precision manufacturing. Through in-depth analysis and tool innovation of the key process of Relay armature plate stamping, not only can the quality of individual parts be improved, but a solid foundation can also be laid for the reliability of the entire product.
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If you have technical needs for the design, verification, or failure analysis of Relay Armature Soft Magnetic Iron in the production of electromagnetic components, relays, or hydraulic valves, please contact us-we will provide professional tooling solution suggestions based on specific part characteristics and process requirements.
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