| 摘要 |
A manufacturing method includes shearing or cutting an elongated rod blank from bar stock, forge-forming a through hole in the rod blank that extends longitudinally through opposing ends of the rod blank, forge-forming a radially-extending collar on the rod blank between the opposing ends, forming attachment holes in the radially-extending collar, and extruding bearing bores in each of the recesses to form a main spindle housing. Bearings are supported in forged recesses at each end, and a shaft is rotatably supported on the bearings. The spindle housing includes a rod portion and collar both forged from the rod blank for work-hardened strength of material, and includes attachment holes and the through hole formed by pressing out slugs of material, thus facilitating recycling of scrap.
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