Method of making a sand mold for casting tread rings utilized in tire molds |
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| 申请号 | US21411871 | 申请日 | 1971-12-30 | 公开(公告)号 | US3840971A | 公开(公告)日 | 1974-10-15 |
| 申请人 | GOODYEAR TIRE & RUBBER; | 发明人 | MCDONALD E; | ||||
| 摘要 | A method of making a sand mold for casting tread rings utilized in tire molds in which molding sand is poured over a flexible pattern to form a mold portion in a general shape of a truncated sector. The mold portion is removed from the flexible pattern before the sand is completely hardened and is then shaved and fitted to other similarly shaped segments as required to form a complete circular sand mold. | ||||||
| 权利要求 | 1. A method of making a sand mold for casting a ring-like metal object comprising pouring sand and binder mix in a pattern to form a truncated sector, leaving said truncated sector in said pattern until said sector is hardened sufficiently to permit removal of said sector from said pattern without damaging said sector, removing said sector from said pattern at a predetermined time before said sand and binder mix is completely hardened, then trimming at least one side of said sector and fitting said sector with a plurality of similarly shaped sectors to form a circular mold, and making a plurality of said sectors in timed sequential steps to permit trimming of said sectors before they become completely hardened. 2. A method as claimed in claim 1, wherein said sand and binder mix are poured over a flexible pattern to permit removal of said sector from said pattern before said sand and binder mix are completely hardened without damaging said section. 3. A method as claimed in claim 2 further including placing a cope half over said circular mold to form a ring-like cavity therewith for forming a metal ring. 4. A method as claimed in claim 1, in which a template is placed adjacent said sector in a predetermined position to determine the extent to which said side is to be trimmed. 5. A method as claimed in claim 4, and utilizing an oilbased binder wherein said sector is maintained in an atmosphere having a temperature between 45* and 120* F. while said sector is on said pattern. 6. A method as claimed in claim 4, and utilizing an oilbased binder wherein said sector is maintained in an atmosphere having a temperature between 60* and 90* F. while said sector is on said pattern. 7. A method as claimEd in claim 3, and utilizing an oilbased binder wherein said sector is maintained in an atmosphere having a temperature between 60* and 90* F. while said sector is on said pattern. |
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