WORKSHOP 2 - SAND MOULDING

MOULDING PROCEDURES

1.     Drag is placed upside down on a bottom board. Drag have to receive the cope once it have been filled with sand.

2.     After that place the patern at the center of the drag.

3.     Slowly put the parting dust at the bottom board and also at the surface of the patern.

4.     To get the fine sand we must used the foundry riddle then shake it to get nice fine sand and must covered the patern almost ¾ inch deep.

5.     Used rammers to compact moulding sand firmly. Do not give over pressure because we don’t want to damage the patern. We must work around outside patern first to prevent moving the petern and also to form the surface key for the next layers sand.

6.     Use coast riddle and rammer until the flask fully rammers and make sure do not rammer to hard.

7.     Use strike off the bar to scrape off the surplus sand and to obtain flate level surface.

8.     Invert the drag and place it on clean bottom board then sprinkled with parting dust placed on cope.

9.     Position the sprue pins to form the cavities or sprue in the cope through wich metalwill flow to the mould and also put the 2^nd part of the patern if ti is two piece patern. Sprue pins placed at lease 2cm from patern at pouring arrangement to avoid too near to the edge  of the flask.

10.                        Slowly put the parting dust at the bottom board and also at the surface of the patern. To make sure the patern do not stick to the sand.

11.                        To get the fine sand we must used the foundry riddle then shake it to get nice fine sand.

12.                        Used rammers to compact moulding sand firmly. Must remembers do not give over pressure because we don’t want to damage the patern. We must work around outside patern first to prevent moving the petern.

13.                        Use coast riddle and rammer until the flask fully rammers and make sure do not rammer to hard.

14.                        Use strike off the bar to scrape off the surplus sand and to obtain flate level surface.

15.                        Remove the sand from the top of the sprue pins to see the surface form.

16.                        Insert draw pins and rapping screws to remove the sprue pins. Rap it lightly but firmly in all direction then free the pins pull out carefully.

17.                        Using fingers round of the corner carefullyto prevent sand wash down the hole that will used when poured melt metal.

18.                        Lift the cope from the drag and then placed upside down to cleane bottom board and sprinkle the parting dust.

19.                        Used wet brush to domped the sand around the edge also at the patern in the drag.

20.                        Insert draw pins and rapping screws to remove the patern. Rap it lightly but firmly in all direction then free the patern pull out carefully because we don’t want to damage tha patern.

21.                        Cut the pouring basins and gate in the drag using finger. After that use bellow to blow the loose sand.

22.                        If it split patern ( two piece) remove the half patern from cope. Used wet brush to dumped the sand . Insert draw pins and rapping screws to remove the patern. Rap it lightly but firmly in all direction then free the patern pull out carefully because we don’t want to damage tha patern.

23.                        Cut the gate to match those cut in the drag clean it by using finger at all corners.

24.                        Mould cavities may be sprayed with the suitable mould coating. This is not essential.

25.                        Before closing the moulding flask to pouring the cavities should be skin dried. This is done by using a gentel flame from Bunsen burner or blow torch.

26.                        Close the flask and cope in suitable place to prevent the flask separating when the metal poured in it.