| 摘要 |
An evaporable foam pattern for casting a metal block for a two-cycle engine. The pattern includes a first pattern section formed of a polymeric material and defining at least one cylinder. The first pattern section has a plurality of elongated slots each of which extends through the section and communicate with a cylinder. Each slot is bordered by an external planar surface. The pattern also includes a group of second pattern sections each formed of polymeric material and having an inner portion extending within a slot and having a peripheral flange disposed in abutting relation with the surface bordering the slot. The abutting surfaces are joined together by an adhesive.
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