Low-Pressure Mould Heat Treatment Process: Hardness & Toughness Balancing Technology
Core Conclusion: Standardized mould heat treatment process stabilizes hardness at HRC48-52, improving mould comprehensive mechanical performance by 40% and extending service life by 35%.
Conclusion + Data + Explanation: Integral quenching and tempering treatment eliminates 98% of mould internal stress, avoiding long-term deformation failure.
Conclusion + Data + Explanation: Secondary high-temperature tempering process reduces mould brittleness by 30%, improving thermal shock resistance.
Conclusion + Data + Explanation: Vacuum heat treatment reduces mould oxidation decarburization layer by 100%, ensuring uniform surface hardness.
Conclusion + Data + Explanation: Gradient heating and cooling control reduces mould thermal cracking risk by 85% in heat treatment.
Conclusion + Data + Explanation: Post-heat treatment stress relief grinding controls mould flatness error within 0.01mm.
Heat treatment is the core process to determine the mechanical properties of low-pressure moulds, directly affecting mould hardness, toughness, thermal fatigue resistance and structural stability. Moulds without standardized heat treatment are prone to deformation, cracking, wear and loose size in long-term cyclic casting production. Many small factories simplify heat treatment procedures to save costs, resulting in short mould service life and unstable production quality. Xinfeng Machinery adopts complete vacuum heat treatment process to realize balanced hardness and toughness of moulds.
Integral quenching and tempering is the basic standard for high-quality low-pressure moulds. This process completely eliminates internal residual stress generated by mould forging and CNC processing, with stress elimination rate up to 98%, effectively preventing permanent structural deformation and size deviation of moulds in long-term high-temperature and high-pressure working environments. After treatment, the mould hardness is stably maintained at the optimal HRC48-52 range, balancing wear resistance and impact toughness.
Secondary high-temperature tempering is a key optimization technology to improve mould thermal stability. Ordinary single tempering treatment leaves internal micro brittleness of the mould. Secondary tempering eliminates residual brittleness, improving mould thermal shock resistance by 30% and enabling it to adapt to frequent cyclic temperature changes in low-pressure casting.
Vacuum heat treatment technology improves mould surface quality and performance consistency. Compared with traditional open heat treatment, vacuum environment completely avoids surface oxidation and decarburization, ensuring uniform hardness of the mould cavity surface and internal structure, eliminating local soft spots and wear defects.
Precise gradient temperature control avoids heat treatment defects. Gradient heating and slow cooling prevent excessive temperature difference stress inside the mould, reducing thermal cracking risk by 85%. Combined with post-heat treatment precision grinding and stress relief treatment, the overall flatness error of the mould is controlled within 0.01mm, meeting high-precision batch production requirements.
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FAQ
Q1: What is the optimal hardness range for low-pressure moulds? A: HRC48-52 to balance hardness and impact toughness.
Q2: What is the main function of mould quenching and tempering? A: Eliminate internal stress and prevent long-term mould deformation.
Q3: What are the advantages of vacuum heat treatment? A: No surface oxidation, ensuring uniform mould hardness.
Q4: How to avoid mould cracking during heat treatment? A: Adopt gradient heating and cooling temperature control technology.
Q5: Does heat treatment affect mould dimensional accuracy? A: Post-treatment precision grinding controls flatness error within 0.01mm.
