Precision Injection Molding Parts: Micron-Level Accuracy & Engineering Excellence
At CNMOULDING (Shanghai), precision is not a marketing term—it is a measurable standard. With over 25 years of specialized experience in mold manufacturing and plastic injection, we support global OEMs in delivering complex components with critical tolerances as tight as ±0.005mm.
Operating from our Shanghai facility, we integrate high-end Japanese machinery with rigorous scientific molding principles to eliminate variability in high-volume production.
1. Technical Capabilities & Tolerances
Precision molding requires controlling the interaction between steel, heat, and polymer. Our capabilities include:
Tolerance Control: Consistently achieving ±0.005mm to ±0.02mm depending on material shrink rates and part geometry.
Wall Thickness: Specializing in thin-wall molding down to 0.3mm without compromising structural integrity.
Surface Finish: Achieving high-gloss or functional textures using Mirror EDM (Sodick) and technical polishing, critical for optical and medical applications.
Multi-Shot & Overmolding: Precision integration of metal inserts or secondary TPE/TPU layers with zero flash.
2. Advanced Material Expertise
We go beyond standard resins (ABS/PP) to process high-performance engineering polymers that require precise thermal management:
PEEK & PPS: High-temperature materials requiring mold temperatures up to 180°C to ensure 100% crystallinity.
LCP (Liquid Crystal Polymer): Expertise in preventing flash in ultra-thin connectors through precise venting and 0.002mm-level steel fit.
PC & PMMA: Optical grade clarity maintained through cleanroom-standard production and specialized screw geometries to prevent shear stress.
Glass-Filled Resins (PA66+GF, PBT+GF): Managing fiber orientation to minimize warpage and ensure dimensional stability in structural parts.
3. Case Studies: Solving Complex Engineering Challenges
Case A: Medical Micro-Fluidic Connector
The Challenge: A component with a 0.5mm internal channel requiring a ±0.01mm concentricity tolerance to prevent fluid leakage.
Our Solution: We utilized Sodick Mirror EDM to create the core pins, ensuring a surface roughness (Ra) that allowed for easy ejection without distorting the micro-features.
The Result: 100% pass rate in pressure testing across 500,000 units.
Case B: Automotive Sensor Housing (Overmolding)
The Challenge: Overmolding a brass insert with PBT+30%GF. The insert was prone to shifting under injection pressure (300 Bar), causing electrical failure.
Our Solution: Developed a custom hydraulic core-pulling sequence to lock the insert in place during the injection phase. We used Moldflow Analysis to relocate the gate, balancing the pressure on both sides of the insert.
The Result: Zero insert displacement and a leak-proof seal meeting IP67 standards.
4. Production & Quality Infrastructure
Our Shanghai facility is designed for technical transparency:
Machinery: All-electric Fanuc and Sumitomo injection machines. All-electric drives provide 30% higher repeatability than hydraulic systems, ensuring the “Shot-to-Shot” consistency required for precision parts.
Tooling: We build our own molds in-house. This allows our engineers to adjust the Steel Safe dimensions after the first trial (T1) based on real-world shrinkage data.
Metrology: Every precision batch is verified using Hexagon CMM, OGP Optical Measuring Systems, and Keyence Digital Microscopes. We provide full FAIR (First Article Inspection Reports) and CPK data.
5. DFM (Design for Manufacturing) Integration
We don’t just take orders; we optimize your design. Every RFQ at CNMOULDING includes a technical DFM review:
Optimization of Gate Location to hide witness marks and reduce internal stress.
Wall Thickness Analysis to prevent sink marks or “voids” in critical areas.
Draft Angle Recommendations to ensure clean ejection of high-precision textures.
Contact Our Shanghai Engineering Team
Skip the sales talk. Speak directly with a mold engineer about your project’s tolerance requirements and material selection.
CNMOULDING (Shanghai) Precision Mold Making & Injection Molding Since 2001.