Fineblanking

Our core competence lies within fineblanking. We have 13 fineblanking presses in operation, from 25 tons up to 700 tons. We also have a manual fineblanking press for fineblanking of e.g. single chamfers or holes in a component. We press components in various types of material, such as ordinary steel but also stainless steel, aluminum, copper and brass. Sheet thickness varies from 0,1 mm up to 12 mm, and width up to 350 mm.

The fineblanking technology enables manufacturing of precision components without any finishing operation of the blanking/cutting surface, since the sheet metal is held still with an additional press force. This is the single most important difference between a fineblanked component and a conventionally stamped component. In applications where a component is exposed for dynamic stress or when the blanking surface has a particular function, like in a gearwheel, fineblanking technology must be used in order to achieve the necessary level of quality the application requires. 

In fineblanking the material is sheared, whereas it is broken in conventional stamping (i.e. the tensile strength of the material has been exceeded). An analogy can be made to divide a piece of paper by either cutting or tearing. What do you prefer? 

Another essential and important difference between a fineblanked component and a conventionally stamped component is its flatness. Since the sheet metal is held still during the blanking operation, via a counter force, the components will come out flatter. Once again, costly finishing operations, like flat grinding, is minimized when using fineblanking technology. 

Precomp_finklipp-6_540px
Comparison  of cutting surface and flatness between a fineblanked component (left) and a conventionally stamped component (right), both 6 mm thick.

 

The difference between fineblanking and conventional stamping may be explained in technical as follows. 
In fineblanking the sheet metal is held still via an impingement ring, the so-called vee ring, and a counter punch. The risk of the material moving/”flowing away” during the blanking operation is therefore greatly reduced. In order to reduce the risk even further, the press operates at a reduced pace during the mere blanking moment.

Achieving a good cutting/blanking surface requires high precision on tool parts and tool steering. For example, the die clearance is much thinner in a fineblanking tool than in a conventional stamping tool. The die clearance in a fineblanking tool is normaly ca 0,5% of the sheet metal thickness, whereas 5-10% in a conventional stamping tool. The die clearance at 5 mm sheet metal thinkness is consequently 0,025 mm (25 µm) in a fineblanking tool. This should be put in contrast with the thickness of a hair, which is approximately 100 µm!

More information on fineblanking may be found on the Internet, for example on Wikipedia.

 

Technique
Stefan Inhammar
Office: +46 321 53 08 00
Phone: +46 705 58 83 44
Email: stefan.inhammar@precomp.com

Sales
Martin West
Office: +46 321 53 08 00
Phone: +46 703 53 08 84
Email: martin.west@precomp.com

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