Carbide Stamping Die
The process of carbide stamping die includes cutting, piercing, bending, deep drawing, trimming, etc. Each process has different technical requirements. The design of stamping molds is of great help in improving production efficiency and product quality.
Guide to Stamping Die Terminology
Guide to Stamping Die Terminology
In the world of metal forming, stamping die plays a crucial role in shaping and transforming raw materials into intricate and functional components. This process involves a specialized set of tools and techniques, each with its unique terminology. Understanding these technical terms is essential for effective communication and collaboration among die designers, manufacturers, and operators.
Stamping Die Components
- Die Block: The die block is the main component of the custom stamping die, which houses the die cavity or impression. It is typically made from hardened tool steel or other durable materials to withstand the immense forces and wear associated with the stamping process.
- Die Cavity: The die cavity is the recessed area within the die block that defines the shape and dimensions of the stamped part. It is meticulously machined to ensure precise replication of the desired part geometry.
- Punch: The punch is the component that applies pressure to the workpiece, forcing it into the die cavity. It is designed to match the shape of the die cavity and is often made from hardened tool steel or other wear-resistant materials.
- Stripper Plate: The stripper plate is used to separate the stamped part from the punch after the stamping operation. It helps prevent the workpiece from sticking to the punch and ensures smooth ejection of the finished part.
- Guide Pins and Bushings: Guide pins and bushings are used to ensure proper alignment and positioning of the die components during the stamping process. They help maintain the accuracy and repeatability of the stamping operation.
Stamping Processes
- Blanking: Blanking is the process of cutting or trimming a flat metal sheet into specific shapes, known as blanks, which serve as the starting point for further forming operations.
- Piercing: Piercing involves creating holes, slots, or other openings in the metal sheet during the stamping process, enabling the production of parts with intricate features.
- Bending: Bending is the process of deforming a metal sheet along a straight line or curve to create a desired angle or shape.
- Drawing: Drawing is a forming process in which a flat blank is transformed into a cup-shaped or cylindrical part by stretching and deforming the metal over a punch or die cavity.
- Trimming: After the initial forming process, trimming is employed to remove excess material and achieve the final part dimensions and contours.
Stamping Die Design and Construction
- Draft Angle: The draft angle is the taper or inclination applied to the die cavity walls to facilitate part ejection and prevent sticking or galling.
- Parting Line: The parting line is the line or surface where the die components separate or meet, allowing for the removal of the stamped part.
- Shut Height: The shut height refers to the distance between the punch and die surfaces when the die is fully closed.
- Tonnage: Tonnage is a measure of the force or pressure required to perform the stamping operation, typically expressed in tons or metric tons.
- Clearance: Clearance refers to the space or gap between the punch and die surfaces, which allows for the flow of material during the stamping process.
Stamping Die Materials
- Tool Steels: Tool steels, such as D2, A2, and H13, are widely used for stamping dies due to their exceptional strength, hardness, and wear resistance.
- Stainless Steels: Stainless steels, like 420 and 440C, offer corrosion resistance and durability, making them suitable for stamping dies used in harsh or corrosive environments.
- Aluminum Alloys: Aluminum alloys, such as 7075 and 6061, are sometimes used for stamping dies due to their lightweight and good thermal conductivity.
- Hardened Tool Steels: Hardened tool steels, like high-speed steels (HSS) and tungsten carbide, are often used for high-wear areas of the die, such as the punch and die cavity, to improve wear resistance and extend the die’s lifespan.
Stamping Die Maintenance and Repair
- Polishing: Polishing is the process of smoothing and refining the die surfaces to maintain a high-quality surface finish on the stamped parts.
- Resurfacing: Resurfacing involves restoring or repairing worn or damaged die surfaces through techniques like welding or applying protective coatings.
- Nitriding: Nitriding is a heat treatment process that introduces nitrogen into the surface of the die components, enhancing their hardness, wear resistance, and corrosion resistance.
- Preventive Maintenance: Preventive maintenance involves regular inspections, cleaning, and lubrication of the die components to prevent failures and ensure optimal performance.
Stamping Defects and Quality Control
- Galling: Galling is a type of wear that occurs when two metal surfaces adhere and tear due to excessive friction or inadequate lubrication.
- Wrinkling: Wrinkling refers to the formation of undesirable folds or creases in the stamped part, often caused by improper material flow or insufficient blank holder pressure.
- Tearing: Tearing is the unintended splitting or fracturing of the metal during the stamping process, typically due to excessive strain or improper die clearances.
- Dimensional Accuracy: Dimensional accuracy refers to the degree to which the stamped part conforms to the specified dimensions and tolerances.
- Surface Finish: Surface finish is a measure of the smoothness and quality of the stamped part’s surface, which can be influenced by factors such as die polishing, lubrication, and material properties.
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