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Introduction
Introduction to Technology of Screw Press On Die Forging
Forging is an ancient metalworking technology developed over the ages. It is the process of deforming metal in a plastic state through compressive force applied to it in one or more determined directions either by open die or closed die forging. Over the years, advancements in machinery, metallurgy and design have made forging the dominant form of metal forming. Screw presses are one of the oldest equipment used for die forging and have been used since the 19th century, providing a low cost and muscle-energy-saving method of producing precision forgings.
This article provides an overview of screw presses and its application in die forging process. It also outlines the advantages and capabilities of this technology. Additionally, it examines the process parameters and products that can be produced by screw press on die forging as well as its limitations compared to other metal forming methods.
Definition of Screw Press
A Screw Press is a type of Volumetric Press that uses a large, rapidly rotating shaft with a screw thread to press die components together under a pressure up to 12-18 tons/in2. The axial force generated by the thread allows for a highly controllable and repeatable movement, making the screw press an ideal tool for precision forging.
Advantages of Screw Press
Screw presses not only provide a cost effective and energy efficient means of producing forgings, but also offer several advantages. These include:
• High operational speeds and output due to the large range of speed control available
• Allow for the accurate control of die components during forging
• Provide rapid, uniform and repeatable heating throughout the die components
• Greater control over the process parameters such as pressure and temperature
• No vibration and high stability when running with large capacities
• Excellent fatigue resistance as a result of reduced structural stresses
• Excellent repeatability as a result of well-defined sets of operating parameters
Process Parameters and Products Produced
Screw press on die forging is usually used to manufacture products such as fasteners, valves, punches and dies, and thin-walled components. The process parameters vary depending on the type of components and the size of die components. The pressure applied to the die components ranges from 3-18 tons/in2 and the temperature ranges from 350-1200 F (177-649 C).
Limitations of Screw Press compared to other Metal Forming Methods
Screw press on die forging has some limitations compared to other metal forming methods. These limitations include:
• Low input pressure compared to other forging processes
• Slower cycle times compared to stamped parts or extrusion
• Limited precision compared to other forging methods
• Reduced tool life due to heat damage
Conclusion
Screw presses are an effective tool to produce precision forgings at low cost and energy efficiency. The advantages of this technology include high operational speeds and output, greater control over process parameters, excellent fatigue resistance and repeatability. The products that can be manufactured through screw press on die forging include fasteners, valves, punches and dies, and thin-walled components. However, the process has some limitations compared to other metal forming methods such as low input pressure and slower cycle times.
