Process for producing retainer for constant velocity joint possessing improved machinability and flexural strength
US6800144B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 13, 2002 |
| Grant date | Oct 5, 2004 |
| Priority date | — |
| Expiry date | Dec 4, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D2003/22303
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Disclosed is a process for producing a retainer for a constant velocity joint for automobiles or the like, which has improved flexural strength properties without sacrificing the machinability, using a steel corresponding to SCr 415 (JIS) or SCM 415 (JIS). This production process comprises the steps of: providing a steel comprising by weight carbon (C): 0.10 to 0.25%, silicon (Si): 0.03 to 0.15%, manganese (Mn): 0.20 to 0.60%, sulfur (S): 0.003 to 0.030%, chromium (Cr): 1.00 to 1.50%, titanium (Ti): 0.05 to 0.20%, boron (B): 0.0005 to 0.0050%, and nitrogen (N): not more than 0.01% with the balance consisting of iron (Fe) and inevitable impurities; hot forging the steel at a heating temperature of 1000 to 1100° C. to prepare a forged product having a Rockwell hardness of not more than 88 HRB; machining and optionally piercing the forged product; carburizing and quenching and tempering the machined steel to attain an effective case depth of 0.4 to 0.9 mm, the effective case depth being defined as the distance from the surface of the steel to the position of the steel in its depth direction where the Vickers hardness is HV 550.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.