Advanced stamping is a cutting-edge method used to create small, high-strength, and high-precision components, originating from traditional stamping processes. This technique relies on three types of forces – punching force, gear ring pressure, and counter-pressure. The resulting parts have benefits such as excellent perpendicularity, smooth surfaces, minimal distortion, and interchangeability.
Fine blanking includes operations like heading, hole sinking, and extrusion, replacing the need for intricate parts made through stamping, forging, milling, and casting. Fine blanking technology, developed by German engineers in the early 1920s, remained confidential until the 1950s. Initially applied in the production of instruments, cameras, household appliances, tools, and electronics, it eventually gained popularity in the automotive and motorcycle sectors.
With advances in technology, fine blanking has evolved to include new materials and processes, allowing for the production of even more complex and precise components. The use of computer-aided design (CAD) software and high-speed cutting tools has further improved the efficiency and accuracy of fine blanking techniques.
The Process of Fine Blanking
In fine blanking, a specialized press machine equipped with gear ring molds, specific materials, and lubricants is used. The V-shaped gear ring presses the material against the die before cutting, creating lateral pressure that enhances plasticity, resulting in precise shapes.
Significance of Precision Stamping in Automotive Manufacturing
Precision stamping plays a crucial role in producing safety-critical components in the automotive industry. Over 200 types of automotive parts benefit from precision stamping, including powertrain elements, seat mechanisms, safety belt mechanisms, diesel engine components, and chassis parts.
BOYA Precision Industrial Equipments Co., Ltd.
BOYA Precision Industrial Equipments Co., Ltd. is a leader in fine blanking technology, delivering top-quality components for the automotive, aerospace, and electronics industries. With years of expertise, we provide customized solutions with strict quality control for precision engineering.
Shearing processes involve cold cutting using sharp blades and are commonly employed in metal fabrication. Various methods like manual shears, electric shears, pneumatic shears, and hydraulic shears can be utilized for cutting sheet metal.
Shearing is a cost-effective option for high-volume production with minimal waste. It is suitable for soft metals such as aluminum, brass, and low-carbon steel.
Sheet Metal Shearing and Blanking
Sheet metal shearing is ideal for making straight cuts on flat metal sheets. It is versatile for cutting various thicknesses of metals and is favored for high-volume production with minimal waste.
Blanking is a technique that precisely cuts out a product from sheet metal using punch and die tools. It finds applications in sectors like automotive manufacturing and industrial production.
While conventional blanking relies on a single force source, fine blanking employs three forces – holding force, counterforce, and blanking force – resulting in smoother edges and tighter tolerances.
Cutting operations involve separating sheet metal by applying force until the material fails. This force is distributed by two tools – one above and one below the metal sheet. Shearing force causes the material to fracture when it exceeds the shear strength limit. The clearance between the tools varies based on factors like material thickness and cutting method.
Shearing effects change as the cutting progresses, leading to different edge zones on the cut material. Various cutting techniques utilize shearing force to separate or shape material in different ways, such as creating open paths for separation or closed paths for removal.
Specifications for Sheet Metal Cutting
- Applicable sheet thickness: 0.005-0.25 inches
- Precision tolerance: ±0.1 inches (±0.005 inches achievable)
- Surface finish range: 250-1000 μin (125-2000 μin possible)
Sheet metal cutting methods rely on shearing force for straight cuts to separate materials. Shearing is commonly used to cut sheet metal into smaller sections for further processing. The process involves a shear machine with upper and lower blades and a gauging device for accurate sheet positioning.
Blanking involves extracting a piece from the sheet metal to create a blank of the desired product. Blanking machinery comprises a blanking press, a blanking punch, and a blanking die. Fine blanking, a specialized blanking process, produces parts with superior flatness and tighter tolerances.
Punching, similar to blanking, removes material from sheet metal using shearing force, creating scrap material known as a slug. Punching is commonly used for making holes and cutouts of various sizes and shapes.
Snap-through or reverse tonnage can result in damages to tools, dies, and presses due to excessive stress, leading to tool fatigue and cracking. Using a coated punch can increase the required blanking forces, while a chamfered punch can reduce them significantly.
Enhancing Edge Stretchability in Metal Shearing
Preparing edges plays a vital role in improving the stretchability of metal edges. Mechanical shearing enhances steel properties but may reduce edge stretchability. Laser or water jet cutting, which avoids cold working, outperforms mechanically sheared edges in edge ductility. Optimizing shear conditions or polishing trimmed edges can yield results comparable to laser and water jet cutting.
There are several techniques that can be used to improve the flexibility of the cutting edge and reduce the risk of damage to tools, such as two-stage piercing and optimized rake angles. It is essential to control key process variables and utilize production-ready tools early in the development phase to ensure long-lasting stretchability of the edge.
Additional Information
- It is important to consider the effects of different edge conditions on the forming process, as well as the final part quality.
- Optimizing tool geometry and lubrication can also help improve edge quality and reduce tool wear.
- Proper maintenance of the tooling equipment is crucial for achieving consistent edge quality over time.
- Collaborating with tooling suppliers and experts can provide valuable insights and recommendations for enhancing edge ductility in press hardening processes.
- Regularly monitoring and analyzing edge quality metrics can help identify any potential issues and make necessary adjustments to improve overall performance.
- Continuously investing in research and development to explore new technologies and techniques for optimizing edge ductility and overall part quality.
- Striving for a well-defined and consistent edge appearance can enhance the overall aesthetics and functionality of press-hardened parts.