In die casting, the plunger rod (also called the plunger pin or shot rod) is a critical component of the injection system, particularly in cold chamber die casting machines.
The function of die casting plunger rod
In the die casting process, the function of the plunger rod (plunger rod) is to push out the molten metal from the injection nozzle (shot sleeve) or barrel (barrel) and inject it into the cavity of the mold, so as to complete the filling and molding of the metal.
Transfer of Molten Metal of die casting plunger rod:
The plunger rod connects to the plunger (piston) inside the shot sleeve.
When the machine cycles, the plunger rod moves forward, forcing the molten metal from the shot sleeve into the die cavity.
High-Pressure Injection:
The plunger rod applies significant pressure (typically 1,000 to 20,000 psi) to ensure the molten metal fills the die completely before solidifying.
Improving casting accuracy and quality
The precise design and material selection of the plunger rod is critical to ensuring the accuracy and quality of the casting. For example, plunger rods are often made of high-strength steel and heat-treated to improve their wear and heat resistance.
In addition, the sealing performance between the plunger rod and plunger head affects the surface quality of the casting and the occurrence of internal defects..
Reducing porosity and condensation defects
During the die casting process, if the molten metal flows into the mold too quickly or at too low a temperature, it can lead to porosity or condensation defects.
Therefore, we need to strictly control the movement speed and pressure of the plunger rod to ensure that the metal flows smoothly into the mold and cools and solidifies properly.
Speed & Pressure Control:
The plunger rod moves in a precisely controlled manner, often in two stages—slow for air evacuation and then fast for filling—to optimize casting quality.
Durability & Wear Resistance:
Since it operates under high pressure and temperature, the plunger rod is usually made from hardened steel or other durable alloys to resist wear and deformation.
Extend Equipment Life and Increase Productivity
To extend the life of the plunger rod and increase productivity, a plunger sleeve is often installed between the plunger rod and the injection nozzle.
The sleeve not only protects the plunger rod from wear and tear, but also reduces friction, which reduces maintenance costs and extends equipment uptime.
Die casting plunger rod supplier: Haichen Machinery
Haichen Machinery is a well-known supplier of die casting machine plunger rods and other related components for the die casting industry. We specialize in providing high-quality, durable, and precision-engineered plunger rods that are essential for the efficient operation of cold chamber die casting machines.
Key Features of Haichen Machinery Plunger Rods:
Material: High-quality alloy steel (e.g., H13) with heat treatment for wear resistance.
Precision Machining: Ensures smooth operation and longevity.
Surface Treatment: Often includes nitriding or chrome plating for enhanced durability.
Compatibility: Designed to fit various die casting machine brands (e.g., LK, Buhler, Frech, UBE, Toshiba, etc.).
Customization: Available in different sizes and specifications to match machine requirements.
If you need plunger rods, plunger tips, sleeves, or other die casting spare parts, we can provide it.
