Squeeze pin control method and apparatus for die casting machine
US5555924A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1994 |
| Grant date | Sep 17, 1996 |
| Priority date | — |
| Expiry date | Oct 25, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D27/11
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A stroke S of a squeeze pin under no load condition of a squeeze pin cylinder for driving the squeeze pin is detected. A value (S-.alpha.) obtained by subtracting a small value .alpha. from the detected stroke S of the squeeze pin is determined as a set stroke of the squeeze pin. After a predetermined waiting time has elapsed from when melted metal is charged into a cavity completely, the squeeze pin is advanced. Here, the actual stroke Sf of the squeeze pin is detected, and the detected stroke Sf is compared with set stroke (S-.alpha..+-..beta.), where .beta. is an allowable deflection. As the result of comparison, if Sf oversteps the set limits (S-.alpha..+-..beta.), at least one of parameters (the pressure and the flow rate of hydraulic fluid supplied to the squeeze pin cylinder and the waiting time) is corrected, so that the detected stroke value Sf approaches the set stroke (S-.alpha.) for the succeeding casting cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.