Hard alloy forming milling cutter for machining square hole groove

According to the hard alloy forming milling cutter for machining the square hole groove, a column core with the section being of a Lelo triangle structure is movably installed in a square through hole matched with the column core in outer side size, and by means of transmission connection of a transmission assembly, the square hole groove can be machined; according to the device, the column core can drive the cutter body installed at the bottom end of the column core to rotate orderly, machining operation of a square hole groove in a plate can be efficiently and conveniently conducted, meanwhile, the interior of a square through hole is filled with butter, and an oil guide structure communicating with the interior of the square through hole is installed on the outer end wall of the column core; and stable lubricating operation can be fully conducted between the square through hole and the column core in the using process of the device, abrasion between the square through hole and the column core can be reduce