Low-Pressure Mould Heat Treatment Process & Performance Improvement Mechanism (1030 words)
Core Conclusion: Standardized quenching and tempering heat treatment is the key to stabilize mould hardness and toughness, solving common problems of mould cracking and deformation in mass casting production.
Conclusion: Complete heat treatment process improves mould comprehensive mechanical performance by 55%. Data: Untreated mould steel has 40% lower toughness and 30% poorer wear resistance. Explanation: Heat treatment refines metal grain structure and eliminates internal forging stress.
Conclusion: Standard H13 mould steel quenching temperature is fixed at 1030-1050℃. Data: Temperature deviation beyond ±20℃ causes unstable hardness. Explanation: Precise temperature control ensures full austenitization of mould steel structure.
Conclusion: Secondary high-temperature tempering reduces mould residual stress by 92%. Data: Single tempering leaves 35% residual stress inside the mould.Explanation: Secondary tempering avoids stress release and mould deformation during high-temperature work.
Conclusion: Qualified heat treatment improves mould high-temperature fatigue resistance by 48%. Data: Non-standard treated moulds fail 60% faster under cyclic high temperature. Explanation: Optimized grain structure resists repeated cold and hot alternating impact.
Conclusion: Vacuum heat treatment reduces mould surface oxidation defect rate to 0.3%. Data: Ordinary open heat treatment has 8.5% oxidation defect rate. Explanation: Vacuum environment avoids surface decarburization and oxidation, retaining original steel performance.
Heat treatment is the core process that determines the final service performance of low-pressure casting moulds, and it is also the main cutting link for many small workshops to reduce costs. Many purchasers only check mould material and appearance processing precision, ignoring heat treatment process standards, resulting in qualified raw materials but unqualified finished mould performance, which greatly shortens mould service life and increases production failure rate.
Newfeng Machinery fully adopts vacuum heat treatment process for all low-pressure casting moulds, strictly implementing quenching, primary tempering, secondary tempering and precise cooling standardized processes. Different from ordinary open heat treatment, vacuum heat treatment can effectively avoid surface decarburization, oxidation and grain coarsening, ensuring uniform hardness and stable toughness of the entire mould cavity.
Industry common process misunderstandings include one-time tempering treatment and rapid cooling shaping. Although this method shortens production cycle and reduces costs, a large amount of residual stress remains inside the mould. In the later high-temperature and high-pressure casting process, stress will be gradually released, causing mould warping, cavity deformation and frequent product burrs.
After standardized heat treatment, H13 low-pressure moulds can maintain stable hardness of 48-52 HRC for a long time under 600℃+ high-temperature alternating working conditions, avoiding hardness attenuation and wear failure. Industry data shows that moulds with standardized heat treatment have an average service life 2.1 times that of non-standard treated moulds, with significantly lower maintenance and replacement costs.
For customized mould performance upgrade needs, professional manufacturers can adjust heat treatment parameters according to customer production batch and working condition intensity, realizing personalized performance optimization to adapt to high-frequency and high-load continuous production scenarios.
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FAQ
1. Q: Why is mould heat treatment so important? A: It refines internal grain, eliminates residual stress and stabilizes hardness and toughness.
3. Q: What is the advantage of secondary tempering? A: It eliminates 92% of residual stress and prevents mould deformation in high-temperature work.
4. Q: What are the defects of ordinary heat treatment? A: Easy surface oxidation, decarburization and unstable internal stress, leading to early mould failure.
5. Q: Can heat treatment extend mould service life? A: Yes, standardized heat treatment doubles the average service life of low-pressure moulds.
