Cell Impact currently offers a range of six standardized High Velocity Impact Units with impact energy spanning from about 100 joules to 150,000 joules. The largest unit has a piston that weighs 1,300 kg and accelerates up to 15 m/s in less than 35 cm. In other words, it reaches an acceleration 30G or more. The smaller the unit, the higher the acceleration.
The units’ reliability and durability have a proven track record, with the unit that has been in operation the longest in a cutting application having recorded nearly 100,000,000 impacts.
Cell Impact offers a revolutionary technology capable of surpassing current limits on metal forming at a lower cost than conventional technology. The improvement in formability can be applied to produce more challenging and lucrative patterns, and to reduce the material thickness required. Regardless of how it is applied, it will significantly contribute to more efficient throughput, shorter cycle times, more cost-effective production and lower capital expenditure, while maintaining, or more likely improving, the overall quality of the produced part.
The simple and proven answer is that it is achieved by increasing the forming velocity (or strain rate) during the forming, embossing, coining, compaction or shearing process. More information about stress strain curve and the theory of increased formability can be found under Applications.
Thanks to the high-speed, the resulting kinetic energy is transferred into the material faster than it can dissipate. The higher energy that is transferred into the material by a piston accelerating towards a tool, the higher is the temperature concentration in a narrow shearing zone. Hence, impact/impulse of extreme pressure is generating clean shears within a fraction of a second. High velocity impacting above 10 m/s is often referred to as adiabatic softening. The main benefits are less work hardening, reduced temperature related stresses and fractures and high-quality in terms of decreased burr height and rollover, less force needed and higher shearing ratio.
With total impact cycles of 0.10 to 0.30 seconds per cycle and piston velocity of up to 15m/s at impact, this technology provides new cost-effective opportunities for a wide area of applications.
The High Velocity Impact Unit can be used for different purposes. The basic HVI-U is however the same compact and proven hydraulic unit that is only further equipped in a modular way to meet new demands such as including the cutting module to create a system ready to be used in a cutting application.
Using the HVI-U for embossing can mean everything from integrating it into a smaller system using only frame, anvil and basic control all the way to a complete high-volume line production. Apart from the possibility of decreasing investment costs, lowering the energy consumption and increasing the productivity, the HVI-U facilitates tight tolerances, more precise patterns and more flat-sheet post forming.
The HVI-U can not only be used for traditional embossing, but the HVI-U can also be used to create coining type of patterns. In some applications this can replace manufacturing methods like etching and milling. In such cases a change to HVI technology can have a revolutionary impact to the production cost.
In cutting or cutoff applications clients do not only benefit from the durability and productivity, but also increased cutting speed and, often more importantly, the increased quality of the cutting surface. Today also the environmental aspect is important. The HVI cutting is not only free of chips, waste material, but also free of coolants. Just clean cuts!
The benefits in blanking and piercing applications are similar to the cutting. This means a client can obtain a fast and clean punch in various materials.Solid and powder material compaction is a wide area of applications. Cellimpact has experience in metals, but also polymers, graphite and in particular expanded graphite forming. Where, in the latter, density figures very close to the theoretic maximum have been achieved after forming.
Cell Impact also offers production of bipolar plates for fuel cells and heat exchanger plates, and various customer specific services in our test centre.
100M in operation:
Impact unit 100M:
Impact Unit in Cutoff Line, HVI-U 20C: