| 摘要 |
A hot chamber die casting machine for casting aluminum and its alloys includes separated ceramic parts, namely a ceramic injection cylinder constituting a pump body, a ceramic outer sleeve, a ceramic injection pipe, and a metallic or thermet flange avoiding a large one piece ceramic body and stress concentrations at critical points. The outer sleeve holds the injection cylinder together with the injection pipe in the molten metal. The flange is fixed to a structure which is outside of and independent from a molten metal container and a heating furnace, thus temperature fluctuations do not affect this injection apparatus. The flange can also be fixed to the structure to which an injection hydraulic cylinder is secured in such a manner that the centers of the hydraulic cylinder, the plunger and the injection cylinder are aligned to perform a stable injection operation. A seal ring is disclosed between no-parallel conical cone shaped-fitting ends between the injection pipe and the injection cylinder. The seal ring can be partially and permanently deformable by a sealing force at the temperature of molten aluminum or its alloy to avoid a stress concentration at the joint.
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