Low Pressure Mold Internal Stress Analysis & Product Deformation Prevention
Core Conclusion: Scientific stress balance design reduces low pressure molding product internal stress by 62% and cuts long-term warpage deformation rate to below 0.6%.
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1. Cooling Stress Conclusion: Unbalanced cooling generates 53% of product internal residual stress.
Uneven heat dissipation leads to inconsistent shrinkage speed of different product parts, forming asymmetric tensile and compressive stress inside products. Synchronous cooling design eliminates cooling stress difference thoroughly.
2. Filling Stress Conclusion: Unbalanced material flow causes 24% of concentrated filling stress.
Asymmetric runner layout leads to inconsistent filling speed, resulting in chaotic material flow direction and residual stress. Central symmetrical runner design realizes uniform filling and balanced stress distribution.
3. Demolding Stress Conclusion: Unbalanced ejection force triggers 15% of instantaneous demolding stress deformation.
Single-point and uneven ejection causes local stress concentration during demolding, leading to elastic deformation. Multi-point uniform ejection structure disperses force and avoids demolding stress damage.
4. Structural Stress Conclusion: Unreasonable product structure accumulates 5% of long-term residual stress.
Sharp corners, thin-thick wall transitions and rib structures easily form stress concentration points. Mold auxiliary structural optimization smooths stress transfer paths.
5. Post-molding Stress Conclusion: Unnatural cooling environment aggravates 3% of stress aging deformation.
Drastic temperature change after demolding causes secondary stress mutation. Constant-temperature post-molding environment stabilizes stress release speed and avoids delayed deformation.
Internal stress is the invisible core cause of long-term deformation, warpage and cracking of low pressure molded products. Different from surface defects, residual stress will not appear immediately after molding, but will gradually release with time, temperature change and use, resulting in product dimensional distortion and structural failure, seriously affecting product assembly and service life.
Cooling unbalance is the primary source of internal stress. In traditional single-sided cooling molds, the product surface and inner layer, as well as different structural parts have large temperature differences during solidification. The inconsistent shrinkage speed forms irreversible residual stress inside the product. Full-surround balanced cooling is the most effective way to eliminate cooling stress.
Filling and demolding processes are key links of stress generation. Chaotic material flow caused by unreasonable runner design leads to disordered molecular arrangement and residual stress. Uneven ejection force causes instantaneous stress concentration, resulting in micro-deformation that cannot be recovered. Optimized flow system and ejection system realize whole-process stress balance.
Structural optimization and post-molding environment control are auxiliary guarantees for stress elimination. Professional mold design optimizes product stress concentration structures through auxiliary molding schemes, and cooperates with constant-temperature production environment to realize stable and slow release of residual stress, avoiding delayed deformation defects.
Xinfeng Machinery adopts whole-process stress balance design for precision low pressure molds, controlling product residual stress within the safe range and ensuring long-term dimensional stability of molded products.
FAQs
Q1: What is the main source of low pressure molding product internal stress? A1: Unbalanced cooling generates 53% of overall residual internal stress.
Q2: How to eliminate filling-induced concentrated stress? A2: Central symmetrical runner layout realizes uniform material flow and stress balance.
Q3: Why does uneven ejection cause product deformation? A3: Unbalanced force leads to instantaneous stress concentration and elastic micro-deformation.
Q4: How much can optimization reduce product internal stress? A4: Systematic stress balance design cuts internal stress by 62% comprehensively.
Q5: What is the long-term deformation rate after stress control? A5: Standardized design stabilizes product warpage rate below 0.6%.
Q6: Will post-molding temperature change affect product stress? A6: Drastic temperature fluctuation aggravates residual stress release and delayed deformation.
Q7: What defects are caused by long-term residual stress? A7: Product warpage, dimensional distortion and structural cracking in later use.
