The tolerance of the main installed dimension of C2

C2K typed blade fram of scraper for conveyor is required to be CT2

3

class. Through adjusting mould dimension

making the draft angle of some key location in the mould to 0

using side-core-board and push-out mechanism to take out the wax pattern

designing hard-wax core to reduce shaping error of the wax pattern as well as using special knife to repair the wax pattern

and setting rational wax pattern assembling tree

pouring with a higher temperature

CT2

3

class accuracy can be realized in the key location in the heat treated investment castings after controlling geometric tolerance with dedicated gauges and C shaped plate.