Injection Mold Process


Posted February 25, 2026 by cnmoulding

At the heart of a high-quality injection mold lies precision machining. We invest in high-end equipment and master-level craftsmanship to ensure every cavity, core, and insert meets your exact specifications.

 
Core Tooling Technologies: Precision Machining Excellence

At the heart of a high-quality injection mold lies precision machining. We invest in high-end equipment and master-level craftsmanship to ensure every cavity, core, and insert meets your exact specifications. Our toolroom integrates three critical machining technologies:

1. High-Speed CNC Machining (The Backbone of Accuracy)

Our CNC department focuses on rapid material removal while maintaining tight dimensional tolerances. By using high-speed spindles and advanced CAM programming, we minimize manual benchwork and ensure consistency.

Capabilities: We handle everything from large mold bases to intricate electrode milling.

Precision: Achievable tolerances up to ±0.005mm.

Surface Finish: Optimized tool paths result in superior surface finishes, reducing the need for extensive polishing and preventing part drag marks.

Hard Milling: Capability to machine hardened tool steel (up to 58-60 HRC), ensuring long-term mold stability and alignment.

2. Precision EDM – Electrical Discharge Machining (The Art of Complexity)

For geometries that traditional cutting tools cannot reach—such as sharp internal corners, deep ribs, and complex textures—our EDM process is indispensable.

Intricate Details: Perfect for creating "blind" pockets and thin-walled features with high aspect ratios.

Mirror Finishing: Our "Mirror EDM" capability produces high-gloss surfaces directly on the steel, essential for clear plastic parts or medical-grade finishes.

Electrode Management: We use high-grade graphite or copper electrodes, precision-milled on our CNCs, to ensure the spark erosion perfectly matches the 3D design.

Uniform Texture: Ensures consistent VDI surface finishes across the entire mold cavity.

3. Precision Wire-Cutting (The Standard for Inserts & Cores)

Wire-cut EDM is our go-to technology for through-hole features, complex parting lines, and high-precision mold inserts.

Extreme Tolerance: Ideal for fitting interlocking mold components where a "zero-clearance" fit is required.

Vertical Accuracy: Ensures perfectly straight walls and tapered angles for lifters and sliders.

Material Integrity: The non-contact nature of wire-cutting prevents mechanical stress on the steel, preserving the material properties of expensive tool steels like S136 or H13.

Repeatability: Highly automated process ensures that replacement inserts are identical to the originals, simplifying your long-term mold maintenance.

Technical Specifications Table
Feature CNC Machining EDM (Sink) Wire-Cut EDM
Primary Use Roughing & Finishing Deep ribs, Sharp corners Inserts, Sliders, Ejector holes
Min. Corner Radius 0.1 mm 0.02 mm 0.05 mm
Max. Hardness Up to 60 HRC No limit (any conductive) No limit (any conductive)
Surface Finish Ra 0.8 - 1.6 μm Ra 0.2 μm (Mirror) Ra 0.4 - 0.8 μm
Best For Speed & Bulk removal Complexity & Texture Precision & Straightness
Our Quality Commitment

Every machined component undergoes rigorous inspection before assembly. We utilize CMM (Coordinate Measuring Machines) and Optical Projectors to verify that the CNC, EDM, and Wire-cut outputs align 100% with the digital twin of your mold.

"Precision in the toolroom means reliability in your production line."

Injection Mold Process
Our Core Technical Capabilities
1. Advanced Tooling & Mold Design

Our engineering department utilizes state-of-the-art CAD/CAM/CAE software to ensure every mold is optimized for the production cycle.

DFM (Design for Manufacturing): We provide comprehensive DFM reports before steel cutting to identify potential issues such as sink marks, air traps, or gate vestiges.

Multi-Cavity Expertise: We design high-efficiency multi-cavity molds (2 to 128 cavities) to significantly reduce unit costs for high-volume orders.

Hot & Cold Runner Systems: Expert integration of systems like Yudo, Mold-Masters, and Husky to optimize material usage.

2. Precision Manufacturing Processes

We utilize a hierarchy of machining technologies to guarantee tolerances as tight as ±0.01mm:

High-Speed CNC Machining: For rapid and precise removal of material and complex geometries.

Precision EDM (Electrical Discharge Machining): For sharp corners, deep ribs, and intricate textures that mechanical cutting cannot reach.

Wire-Cut EDM: Essential for producing high-precision inserts and complex mold cores.

3. High-Performance Injection Molding

Our facility in Shanghai is equipped with advanced injection machines (ranging from 50T to 1200T) capable of handling a wide array of resins:

Engineering Plastics: ABS, PC, Nylon (PA6/PA66), POM, PBT.

High-Performance Polymers: PEEK, PPS, PSU, LCP.

Elastomers: TPE, TPU, Silicon.




Our Process: From Concept to T1 Sample

Inquiry & Quotation: 24-48 hour response time with preliminary cost analysis.

DFM & Mold Design: Detailed structural analysis and 3D design approval.

Tooling Fabrication: Weekly progress reports with photos and videos.

Mold Trial (T1): Sample submission for customer validation.

Quality Inspection: Full dimensional report using CMM and projector.

Mass Production or Mold Shipping: Safe seaworthy/airworthy packaging.
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Contact Email [email protected]
Issued By injectionmoldchina
Phone 0086-021-52913487
Country China
Categories Industry , Manufacturing , Medical
Tags precision manufacturing processes
Last Updated February 25, 2026