| 摘要 |
PURPOSE: The process for producing cylinder heads are to reduce the producing cost by pouring the valve seat rings(8) and valve guides, is to increase the heat conduction by combination the valve seat rings and valve guides. CONSTITUTION: The special feature of this process is that valve seat rings (8) and valve guides (7) are produced from a conventional material based on steel or copper by pressing and sintering in such a way that they have an open pore volume of 5 to 15 %, a valve seat (8) and/or a valve guide (7) are laid on the stepped sections (4, 3) of the mould core (2), whereafter liquid aluminium is poured into the preheated mould and the mould core (2) is removed in the conventional way after the molten aluminium (1) has solidified.
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