You cannot change the way that Calibre names book it stores into files in its internal file store. Here is a sticky that idssusses this.
The closest you can get to what you want will be if you use the Calibre Save to Disk facility to exprt the eBook files from Calibre. In this case you can set the Save to Disk template under preferences to give you the i older/iename structure you are looking for.
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