Index plate assembly for grinding of six-cylinder crankshaft rod journal

The invention provides an index plate assembly for grinding of a six-cylinder crankshaft rod journal. The index plate assembly comprises a crankshaft headstock flange, wherein a first indexing and positioning hole, a second indexing and positioning hole and a third indexing and positioning hole are uniformly distributed in the circumference of the crankshaft headstock flange; a guide channel is arranged below the crankshaft headstock flange, an end cap is arranged at the front end of the guide channel, a compression spring and a separation pin boss are arranged in the guide channel, a pin head is arranged at the front end of the separation pin boss, the compression spring presses and touches the separation pin boss till the pin head extends outwards to the end cap, and a poking pin is arranged in the vertical direction of the separation pin boss; a positioning bent plate is arranged on the crankshaft headstock flange at one side of the guide channel, a separation handle is horizontally arranged above the guid