Fineblanking Vs. Metal Spinning


Fine blanking is a technically advanced stamping technology that produces stamped parts with smaller dimensions, higher loads, and high precision. It is a precision blanking method developed from the general blanking technology.

The fine blanking process contains three types of forces: punching force FG, ring force FR, and counter pressure FS, which makes fine blanking technology different from other common stamping or blanking processes. The workpiece processed by fine blanking has many advantages, such as good perpendicularity and a bright cutting surface without tearing.

The workpiece has a very small gap because of the crimp ring clamping in the die during the fine blanking process. The part is particularly flat, the cut-off edge of the part normally does not require post-processing, the warpage is small, and interchangeability is good.

Fineblanking samples

After the combination of upsetting and extruding, pressing and sinking holes, half-punching and extruding, and other processing means, it gradually replaces many complex parts originally made by general punching, forging, machining, casting, and powder metallurgy and can assemble multi-functional parts after punching without subsequent processing, with obvious production efficiency and cost advantages.

It was invented and patented by German Fritz Schiess as early as 1923. The world’s first fine blanking plant was opened in Switzerland in 1924, after which the technology was kept secret, providing parts for clocks, sewing machines, typewriters, and so on. It was not until the 1950s that fine blanking technology became publicly available. By the 1980s, used it in instrumentation, cameras, home appliances, and small hardware, and then widely used in the automotive and motorcycle industries and the 3C electronics industry.

What parts are suitable for the production of fine blanking technology?

Fine blanking is widely used for safety parts in the automotive industry to ensure stable work and error-free operation even under severe and dangerous conditions. The production of automotive fine blanking parts is mainly based on strong crimping precision blanking, geometry, size tolerance, shape tolerance, and shear surface quality are much higher than the ordinary blanking parts.

There are more than 200 kinds of common automotive parts: powertrain parts, i.e., transmission steel, engine sprocket chain, brake components, shock absorbing parts, and camshaft adjusting device parts; seat height adjuster, seat angle adjuster, seat slide parts; seat belt tighteners, airbag locking parts; diesel engine nozzle clevis, multi-vane pulley, valve plate for air conditioning compressor, torque converter clutch plate and clutch hub, planetary frame and drive disc, brake disc, parking gear, and pawl, clutch hub; brake pads and wheel pallets in the chassis.

Fine blanking can also produce parts similar to the above parts in mechanical, medical, electronic, hardware, electrical, and other industries.

Metal Spinning

Spinning is a combination of forging, extrusion, stretching, bending, ring rolling, cross-rolling, and rolling extrusion process characteristics of less cutting plus the advanced process, the metal cylinder billet, flat blank or prefabricated billet with the end of the top tightened on the spinning movement die, driven by the spindle mandrel and billet rotation. In contrast, the spinning wheel from the blank side of the material extrusion on the rotating die so that the material produces a continuous plastic deformation point by point to obtain a variety of hollow, rotating body parts of various bus shapes.

Spinning technology is an old technique, similar to the production of clay tires by rotating a potter’s wheel, and is divided into two types: ordinary spinning and powerful spinning. Not changing the thickness of the blank, only changing the shape of the blank, is called ordinary spinning forming. Both change the thickness of the blank and the shape of the blank spinning called strong spinning forming.

Modern spinning technology originated in the military industry in the 1950s and then spread to the civilian industry, where it is widely used. Spinning can complete a variety of complex sheet metal parts and is a special forming method to complete the processing of deep drawing, flanging, indentation, expansion, and rolled edges.

Spinning is a less efficient processing method than stamping, but the tooling is simple. It can produce small quantities of multi-species, complex shapes, and stressed metal parts with large loads through programming. In contrast, once the output of some spinning parts similar to the head is huge, open-die deep-drawing stamping is often used instead to enhance efficiency.

Which industries and which parts are spinning suitable?

Spinning is suitable for a wide range of industries such as automotive, military, diving sports, natural gas, lighting, machinery manufacturing, home appliances, chemical, wind power, aerospace, oil, gas, rail transportation, road construction, advertising, metal processing, musical instruments, kitchenware, hotel supplies, etc. It is used to produce the following parts: car/motorcycle/truck/bus wheels, spokes, rim lock surfaces, rail vehicle wheels, natural gas tanks, CNG tanks, industrial gas bottles, batteries, transportation and storage tools, fire extinguishers, reflectors, fan parts, cooking pans, separator parts, tank bottoms, heads, fuel containers, drive shafts, cylindrical tubing, precision tubes, hydraulic cylinders, clutch mounts, converter housings, hollow shafts, brake pistons, multi-V pulleys, flywheel starter gears, drive parts with sealed ring grooves, traffic signal poles, flag poles, precision aluminum alloy poles, road crossing poles, hollow shafts with grooves, etc.

Metal Spinning samples

Generally speaking, high-end cars with forged wheels are light and strong, but the cost is high. For low-end cars with cast wheels, the casting + spinning process is a way to produce the wheel quality between the two, gaining widespread use in recent years.