Performance Characteristics of QT400-18 Ductile Iron for Mold Base
In the field of mold manufacturing, especially for selecting materials for mold bases, QT400-18 ductile iron is widely used as a typical material due to its excellent comprehensive performance. Its main performance characteristics are as follows:
1. Excellent Casting Performance
QT400-18 ductile iron has good fluidity and relatively low shrinkage, allowing it to perfectly fill complex cavities and cast mold base parts with intricate shapes and precise dimensions. This not only reduces subsequent machining requirements but also enables the production of large, integrated, or structurally specialized mold bases, effectively enhancing design freedom.
2. Outstanding Vibration Damping and Noise Reduction Performance
The unique spheroidal graphite structure within the material can effectively absorb and dissipate mechanical vibration energy. When the mold operates under high pressure and high speed, a QT400-18 mold base can significantly suppress vibrations and reduce operational noise. This improves the operational stability of injection molding or die-casting machines, protects the precision of the mold cavity, and enhances the working environment.
3. Good Comprehensive Mechanical Properties
In the grade "QT400-18," "400" indicates a minimum tensile strength of 400 MPa, and "18" represents a minimum elongation of 18%. This shows that the material possesses certain strength along with good toughness (ductility), enabling it to withstand the cyclic stress and certain impact loads generated during mold clamping and locking, thereby avoiding brittle fracture.
4. Excellent Cost-Effectiveness and Machinability
Compared to large forgings or other alloy materials, QT400-18 offers lower raw material and manufacturing costs, providing significant economic benefits. At the same time, it exhibits good machinability, facilitating subsequent mechanical processes such as drilling and milling, which is conducive to achieving the assembly accuracy of the mold base.
5. Stable Performance in Use
Ductile iron mold bases exhibit good dimensional stability during long-term use, and their wear resistance meets general requirements. Their moderate hardness and balanced strength-toughness combination make them less prone to deformation or failure under long-term alternating stress.
Summary
In conclusion, QT400-18 ductile iron is particularly suitable for manufacturing mold bases for large injection molds and die-casting molds that require high vibration damping, complex structures, and cost control. Its good castability, exceptional vibration damping properties, balanced strength and toughness, and high economic efficiency make it a classic and reliable foundational structural material in the mold industry.
