(1) Place the prepared core bone (iron pipe wrapped with straw rope) on the carriage frame, and then put the car pole so that the distance from the working edge of the carriage to the surface of the iron pipe is equal to half of the difference between the diameter of the sand core and the outer diameter of the iron pipe. For example, if the diameter of the sand core in the molten iron is yin and yang, and the outer diameter of the iron pipe is yin and yang, the distance from the working edge of the car plate to the iron pipe is yin and yang. At this time, the diameter of the sand core is 300nun
(2) After the car plate is aligned, fix the car plate on the car plate frame with pressing plate bolts. When turning the sand core, the plate shall not move, otherwise the size of the sand core turned out is inaccurate
(3) In order to check whether the plate is installed correctly, test run it at both ends of the sand core and measure it with calipers. If the size is incorrect, readjust it
Hot metal sand-coated core turning: on the prepared core bone, first apply a layer of hemp mud with a thickness of 10-12 yang, then apply the core sand and compact it by hand. The core diameter and thickness should generally be between 25-80 nun (depending on the diameter of the sand core, the larger the diameter of the sand core, the thicker the sand layer). Because the sand layer is too thick and easy to fall off, it is too thin and has insufficient strength. Turn the core bone and scrape off the excess core sand. After the core is turned, a layer of hemp mud can be added to make the surface smooth
The molten iron coated with sand core can be coated on the carriage frame and then sent to the drying furnace for drying. In order to prevent the straw rope around the iron pipe from burning during drying and damaging the tong and core, the iron pipe can be blocked with molding tong before drying to prevent the furnace gas from entering the iron pipe< br/>