
It is mainly due to the mold not being hot enough at the start of the pouring stage of metal casting or the sand has a little too much water in its make-up, or again, the casting mold has too little ventilation to let any flashed steam out. What this does is to form a very hard skin on the surface of your casting, maybe only a few thou’ thick, and it is this surface that causes most problems to engineers. In the process of casting, when it is at a very high temperature in a liquid state, as the liquid is poured into a cool mold, then the sudden change in temperature of the contact surface causes the liquid iron to solidify very quickly, while the remainder of the iron cools more slowly. Machining cast iron in a lathe or a mill can be a bit of a problem for anyone new to this metal.Ĭast iron, by its nature, can be very awkward to deal with. If you don't think any of the above situations apply, you can use this feedback form to request a review of this block.Machining cast iron in a lathe or a mill.

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