Fine blanking can be used to produce high-precision parts with tear-free and break-free cut surfaces. Sheet thicknesses are usually between 0.5 and 3 millimeters.
Fine blanking technology has been around for over 100 years. In the past, the term “fine punching” was also commonly used for this process. The punching or cutting process is usually carried out on a triple-action press. In the first step, the component is “clamped” or gripped by ring teeth. The cutting process then takes place in the second step. The parts produced by the fine blanking press impress with their high flatness and minimal tolerances in terms of shape, position, and dimensional accuracy.
Fine blanking tools
The designers and toolmakers at Precision Forming bring decades of experience to bear when it comes to developing and building a fine blanking tool for a tricky component. We offer a special feature in the field of fine blanking tools with our patented fine blanking pads, which we developed ourselves. These pads also enable fine blanking of thicker sheets at 4 mm, 5 mm, 6 mm, or more and can also be used for fine blanking on a “normal” press. The pad is integrated into the designated stage where the required precision is needed, and it immediately becomes a fine blanking tool. For more information, see: Fine blanking pads from Precision Forming Schuler in Amtzell
Fine blanking – tolerances in the range of a hundredths millimeter
The tolerances that can be achieved for formed parts depend on several factors, including the material, the forming process, and the tool used. The general tolerances for sheet metal parts are usually in the range of ±0.1 mm to ±0.5 mm. Fine blanking parts or precision formed parts, on the other hand, can achieve tolerances of ±0.05 mm or better.
The thickness and shape of the component also play an important role. Thinner sheets (<1 mm) can usually be processed more precisely than thick sheets (>3 mm). In the case of complex shapes and geometries, material flow and springback have a greater influence on tolerance accuracy.
Tolerances at a glance:
| Fine blanking parts and precision forming parts | ±0.05 mm or better | |
| Stamped and cutted parts | ±0.1 mm to ±0.3 mm | |
| Bent and deep-drawn parts (+ springback of the material) | ±0.2 mm to ±0.5 mm |