Does someone know if any hollow toolholder used to extract chip during the machining exist? In that case, how is the principle of operation of this system?
There are no 'off the shelf' commercially available tool holders that will remove the swarf via the tool holder. I have however designed several custom built systems that do remove the swarf.
The nearest 'off the shelf' system available are hollow drills for 'deep hole drilling' that have holes at the end of the drill to deliver coolant to the bottom of the hole and flush out swarf. On larger holes the coolant carrying swarf can be flushed through the tool and away from the hole. but these require large hole size to work, and a complete tooling system to deliver coolant and then flush it away through the tool. The tool holder & machine they are used on needs to be designed to provide this feature. See the links / address below from Sandvik by way of examples.
https://www.sandvik.coromant.com/en-gb/knowledge/general-turning/pages/how-to-apply-coolant-and-cutting-fluid-in-turning.aspx
https://www.sandvik.coromant.com/en-gb/products/corodrill-r840/
https://www.sandvik.coromant.com/en-gb/knowledge/drilling/application_overview/deep_hole_machining/single_tube_system_sts/Pages/default.aspx
The principal issue to removal of the chips is size;
Size of tool, relative to Size of hole - is there room for chips to pass up the inside of the tool or up the outside?
Size of chip - are these large, small, continuous or intermittent?
Rete of chip production - high volume or low?
Coolant or no coolant?
Cutting Internally (boreing / drilling) or externally (turning), Milling could fall into either.
Depth of cut, How far does the tool penetrate the work - per cut and in total. removal of swarf from a surface is far easier than from 100mm into a hole or pocket.
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