It is suggested that you take K5 and K2 from Hengyang Railway Station to Hengyang Railway Station, and then transfer to 1 or A Ring Road to Hengyang Fengshun Axle Factory. You can also take K 1 to Huaxin 4 17 and get off and transfer to Fengshun Axle. You'd better ask the bus driver to remind you to get off.
For reference only, good luck!