Randall G Silverthorn

Title: The Innovative Contributions of Randall G. Silverthorn

Introduction

Randall G. Silverthorn is a notable inventor based in Clarkston, MI (US). He has made significant contributions to the field of die casting technology. His innovative approach has led to the development of a unique electrohydraulic control system for die casting machines.

Latest Patents

One of Silverthorn's key patents is titled "Electrohydraulic control of a die casting machine." This invention involves a die casting machine that features a shot cylinder with a ram for injecting metal into a die cavity. The electrohydraulic system he developed controls the operation of the shot cylinder through an actuator coupled to the shot cylinder ram. A valve supplies hydraulic fluid to the actuator cylinder based on valve control signals. The microprocessor-based digital control electronics store a desired ram velocity profile as an incremental function of ram position. The control circuitry responds to signals from a sensor linked to the actuator, which indicates the position of the ram. This allows for the retrieval of corresponding velocity signals from memory, supplying control signals to the valve based on the profile velocity signals. Additionally, the control circuitry includes a feature for adjusting the impact of the shot cylinder ram at the end of a cavity-filling stroke, which helps reduce separation and flashing at the die cavity. This innovation also minimizes impact wear and fatigue on the overall die casting machine. The system includes a keyboard and operator display for programmability and selection from various velocity/position profiles.

Career Highlights

Silverthorn has worked at Vickers, Inc., where he has applied his expertise in electrohydraulic systems. His work has significantly advanced the efficiency and effectiveness of die casting processes.

Collaborations

He has collaborated with notable coworkers such as Mohamed E. Dahroug and Yehia M. El-Ibiary, contributing to the development of innovative solutions in their field.

Conclusion

Randall G. Silverthorn's contributions to die casting technology through his patent on electrohydraulic control systems exemplify his innovative spirit and dedication to advancing manufacturing processes. His work continues to influence the industry positively.