Method of manufacturing connecting rod
US6427326B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 2000 |
| Grant date | Aug 6, 2002 |
| Priority date | — |
| Expiry date | Jun 1, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49291
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A connecting rod is formed by cold forging in a single pressing cycle at a good accuracy without separately preparing a large-end cap, to thereby reduce the manufacturing cost. A double-action type of forging apparatus is made up of an upper die, a lower die, and a large-end portion punch and a small-end portion punch, both being movably provided in each of the dies. The upper die is closed to the lower die while forging a preform, to thereby roughly form a connecting rod. Then, the large-end portion punch and the small-end portion punch are protruded into a forming space between both the upper and lower dies to forge the parts to be pierced, thereby filling underfilled parts with material. Then, the large-end portion punch and the small-end portion punch on the side of the upper die are pushed out of the forming space to reach the lower die. The underfills left in the parts to be pierced are blanked or punched away to form a large-end hole and a small-end hole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.