Process for producing camshaft with cams subjected to remelting chilling treatment
US4661676A · kind A · utility
3Cited by
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7Claims
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Assignee
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Key dates
| Filing date | Feb 24, 1986 |
| Grant date | Apr 28, 1987 |
| Priority date | — |
| Expiry date | Feb 24, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/2101
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for producing a camshaft with cams include the steps of forming a surface hardened layer in each of the cams by a remelting chilling treatment using high density energy (e.g., a TIG arc), characterized in that after the remelting chilling treatment, the camshaft is cooled by passing a cooling medium through a through hole formed longitudinally in the camshaft. As a result of the cooling, the neighboring untreated cam has a temperature of up to 250.degree. C. Elongation of the camshaft due to thermal expansion is so small that no melt-down end portion defects appear.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.