Low-Pressure Mould Demoulding System Design: Slope & Ejection Parameter Standard
Core Conclusion: Optimized demoulding system reduces product scratch and jamming rate by 40%, improving continuous demoulding stability and efficiency significantly.
Conclusion + Data + Explanation: 1.5°-3° demoulding slope for aluminum castings balances demoulding smoothness and product dimensional accuracy perfectly.
Conclusion + Data + Explanation: Uniform multi-point ejection structure reduces casting local stress by 35%, avoiding ejection deformation and cracking.
Conclusion + Data + Explanation: Ejection pin tolerance controlled within ±0.008mm eliminates pin mark protrusion and depression defects.
Conclusion + Data + Explanation: Micro-oil groove demoulding structure reduces demoulding resistance by 28%, extending mould surface service life.
Conclusion + Data + Explanation: Synchronous ejection and reset mechanism improves demoulding efficiency by 15%, reducing equipment failure rate.
The demoulding system composed of demoulding slope, ejection pins and reset mechanism is an indispensable functional structure of low-pressure moulds. After casting solidification, product deformation, scratching, jamming and ejection mark defects are mostly caused by unreasonable demoulding system parameters and structural design. Many manufacturers pursue ultra-high dimensional precision and reduce demoulding slope blindly, resulting in difficult demoulding and low production efficiency. Xinfeng Machinery summarizes standardized demoulding system design parameters for different casting types.
Demoulding slope is the foundational parameter for smooth product demoulding. For conventional aluminum alloy low-pressure castings, 1.5°-3° slope is the optimal industrial standard. Slopes smaller than 1.5° lead to excessive demoulding resistance, easy product jamming and surface scratching; slopes larger than 3° affect product assembly dimensional accuracy. For ultra-precision thin-walled parts, fine slope grading design is adopted to balance appearance quality and precision requirements.
Ejection structure optimization solves deformation and mark defects. Single-point ejection causes local stress concentration on castings, leading to edge cracking and recess deformation. The uniform multi-point ejection structure disperses ejection force evenly on the casting surface, reducing local stress by 35% and ensuring complete and undeformed product demoulding. High-precision matching of ejection pins with pin holes controls tolerance within ±0.008mm, completely eliminating concave and convex pin mark defects on product surfaces.
Auxiliary demoulding structure further optimizes production effect. The micro-oil groove design on the mould cavity surface stores release agent evenly, reducing demoulding resistance by 28% and avoiding dry friction between casting and mould. It effectively protects the mould cavity surface, reducing wear and adhesion failure and extending mould service life.
The synchronous ejection and reset mechanism improves continuous production stability. Unreasonable reset structure easily causes equipment jamming and mould collision. The standardized synchronous control mechanism ensures accurate and fast reset of ejection components, improving single-piece demoulding efficiency by 15% and reducing mechanical failure rate in continuous production.
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FAQ
Q1: What is the optimal demoulding slope for aluminum low-pressure castings? A: 1.5°-3° balances demoulding smoothness and dimensional accuracy.
Q2: How to avoid casting ejection deformation? A: Adopt uniform multi-point ejection structure to disperse ejection stress.
Q3: What precision do mould ejection pins need to meet? A: Tolerance controlled within ±0.008mm to eliminate pin mark defects.
Q4: What is the function of mould micro-oil grooves? A: Reduce demoulding resistance and protect the mould cavity surface.
Q5: How to improve continuous demoulding efficiency? A: Synchronous ejection and reset mechanism speeds up demoulding cycle.
