Support Three-Step Composite Stamping Die
Source: China Bearing Network | Date: October 25, 2013
The support seat shown in Figure 1 is a critical sheet metal 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 material, forming a U-shaped blank, bending both sides inward, and punching a small hole of φ20. For low-volume production or when the height is not significant, the strip can be formed on a folding machine, and the small hole can be drilled. However, for more complex or large-scale production, using a die becomes essential. Traditionally, three separate molds are used for forming and punching, which leads to lower productivity, higher costs, and less efficiency. To address these issues, a three-step composite stamping die has been introduced. This die significantly improves the efficiency and quality of the stamping process for the support seat. The layout of the three-step composite stamping die is illustrated in Figure 2. It consists of key components such as the fixed wedge, die, movable wedge, forming punch, and punching punch. Guided by guide pillars, the mold ensures precise alignment during operation. When the mold is in the upper position, the blank strip is placed on the die and forming punch, and positioned using the plate and positioning pin. As the press moves down, the pressing plate compresses the blank under spring force, completing the blanking process. The punching punch then creates the φ20 hole as the press continues its movement. The fixed wedge guides the blank into a U-shape, while the movable wedge bends the sides inward. At the bottom dead center, the mold opens, allowing the finished part to be removed. Key working parts include: 1. **Punch**: Made of Cr12MoV steel, heat-treated to 58-62HRC. Due to its slender design, careful checks are performed to ensure stability and strength. It can be designed as a stepped shaft or sleeve. 2. **Forming Punch**: Crafted from T10A steel, hardened to 56-60HRC. Its complex shape requires careful heat treatment, often using pre-cooling or asbestos packing to reduce deformation. 3. **Die**: Designed with a mosaic layout for easy maintenance. Made of T10A steel (56-60HRC), it is fixed using screws and pins. The die body is made of 45 steel (28-32HRC) to enhance cost-effectiveness. 4. **Fixed Wedge**: A critical component that acts as a punch during blanking and helps move the movable die. It is made of T10A steel, hardened to 56-60HRC for durability. 5. **Movable Wedge**: Constructed from 45 steel, heat-treated to 43-48HRC, ensuring wear resistance and smooth motion. This innovative approach reduces production time, enhances precision, and improves economic efficiency in manufacturing stamped parts.
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