**Support Three-Step Composite Stamping Die** Home > Bearing Knowledge > Support Three-Step Composite Stamping Die var cpro_id = "u3440131";

Supporting Three-Step Composite Stamping Die

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var cpro_id = 'u3171089';

**I. Introduction** The support seat shown in Figure 1 is a key sheet metal stamping component used in a new type of equipment. It is made from 1Cr18Ni9Ti steel with a thickness of δ=1.5mm. The stamping process involves high yield strength, forming a U-shaped blank, bending both sides inward, and punching a small hole with a diameter of φ20. For small-batch or single-piece production, the part can be formed on a folding machine and the small hole drilled on a drilling machine. However, for higher efficiency and quality, a three-step composite stamping die is recommended. This approach significantly improves productivity, reduces processing steps, and enhances economic efficiency compared to traditional methods that require three separate molds. **II. Mold Layout and Working Principle** 1. **Mold Layout**: As shown in Figure 2, the three-step composite stamping die consists of key components such as the fixed wedge (7), die (10), movable wedge (12), forming punch (14), and punching punch (15). The mold uses guide pillars for precise alignment during operation. 2. **Working Principle**: When the mold is at the upper limit position, the blank strip is placed on the die 10 and forming punch 14, and positioned using plate 8 and positioning pin 17. During the stamping process, the upper mold descends with the press slider. The spring 2 presses the blank, and the fixed wedge 7 and die 10 complete the blanking operation. The punching punch 15 then punches the φ20 hole. As the press continues to move, the fixed wedge 7 bends the blank inward, pushing the movable wedge 12 to complete the forming. At the bottom dead center, the mold opens, and the fixed wedge and punching punch separate from the die and forming punch. The spring 13 returns the movable wedge to its original position, allowing the finished part to be removed. **III. Key Working Components** 1. **Punching Punch**: Made from Cr12MoV steel with a heat treatment hardness of 58–62HRC. Due to its large diameter, it is designed as a slender rod, requiring careful strength and stability checks. A stepped shaft or sleeve design is recommended to enhance durability. 2. **Forming Punch**: Constructed from T10A steel with a hardness of 56–60HRC. Its complex shape and uneven wall thickness require careful heat treatment. Techniques like pre-cooled quenching or asbestos packing in the inner hole are used to reduce deformation and cracking risks. 3. **Die**: Designed with a mosaic layout for easy maintenance. The die body is made from 45 steel (hardness 28–32HRC) and fixed with screws and pins. The insert is made from T10A steel (hardness 56–60HRC), allowing replacement without replacing the entire die. 4. **Fixed Wedge**: A critical working component that acts as a punch during blanking and guides the movable wedge during forming. It is made from T10A steel (hardness 56–60HRC) to ensure high strength and wear resistance. 5. **Movable Wedge**: Constructed from 45 steel with a hardness of 43–48HRC, providing good wear resistance and motion stability. **IV. Conclusion** The use of a three-step composite stamping die significantly improves the efficiency and quality of stamping operations. By integrating multiple processes into one tool, it reduces labor and time, enhances precision, and lowers overall costs. This makes it an ideal choice for producing complex U-shaped parts in small batches or custom orders. **Related Bearing Knowledge:** - Jinan Steel Bearing Management Status and Improvement Measures (2) - Skill Analysis: Common Terminology for the Protection and Repair of Rolling Mill Bearings - IKO Imported Bearing Failure Identification and Replacement Methods - Bearing Selection Considerations This article is sourced from [China Bearing Network](http://www.chinabearing.net) Previous: "Motorcycle Bearing" Protection Method Keeps It Looking New Next: High-Function CNC Machine Tool and Electric Spindle Unit --- (Word count: 540)

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