Precision EDM Graphite Electrode Block for Mold Making
Product Overview
Our EDM graphite electrode blocks are premium-grade isostatic graphite billets specifically formulated for electrical discharge machining (EDM) of precision tooling and molds. With fine grain structure, uniform material properties, and optimized electrical resistivity, these blocks enable high-speed, high-precision EDM sinking with minimal electrode wear and excellent surface finish. Available in a range of grades from fine-grain (10 µm) to ultra-fine grain (5 µm), we supply both raw blocks and pre-machined electrode blanks for injection mold, die-casting mold, and stamping die manufacturers worldwide.
Graphite electrodes have largely replaced copper electrodes in precision mold making because they machine faster, weigh less, can be machined into complex geometries without deformation, and exhibit significantly lower electrode wear during finishing discharges. At Jincheng Graphite, we stock a comprehensive range of standard EDM graphite block sizes and can custom-machine electrode geometries to customer drawings, including multi-cavity electrode assemblies and fine-detail electrodes for delicate mold inserts.
Key Features
- Fine grain structure - 5-15 µm grain sizes for excellent surface finish and corner retention
- Low electrode wear ratio - optimized resistivity minimizes wear during finishing passes
- High machining speed - machines 3-5x faster than copper with standard CNC tooling
- Lightweight - 1.85 g/cm³ density reduces fixture load and enables large electrode designs
- No deformation - rigid graphite structure holds sharp edges and fine details during EDM
- Uniform material properties - consistent resistivity across each block for predictable EDM performance
- Available in standard and custom sizes - up to 600 × 400 × 300 mm blocks
- Pre-machined blanks available - rough-machined to near-net shape to reduce your machining time
Technical Specifications
| Parameter | Value |
|---|---|
| Material Type | Isostatic molded fine-grain graphite |
| Grain Size | 5 - 15 µm (grade-dependent) |
| Bulk Density | 1.78 - 1.88 g/cm³ |
| Shore Hardness | 60 - 75 HS |
| Flexural Strength | 45 - 65 MPa |
| Electrical Resistivity | 11 - 16 µΩ·m |
| Particle Size (max) | 15 µm (fine), 8 µm (ultra-fine) |
| Standard Block Sizes | 200×200, 300×300, 400×400, 500×400 mm |
| Thickness Range | 20 - 300 mm |
| Dimensional Tolerance (as cut) | ±0.5 mm |
| Machined Flatness | ±0.05 mm |
| Ash Content | < 500 ppm |
Applications
- Injection mold EDM - precision cavity and core sinking for plastic injection molds
- Die-casting mold EDM - aluminum and zinc die-casting insert electrodes
- Stamping and forming dies - progressive die and blanking die electrode machining
- Tool and die making - precision forging die and extrusion die electrodes
- Medical mold manufacturing - micro-insert and fine-detail EDM for medical component molds
- Aerospace component tooling - complex aerospace part mold and fixture electrodes
Why Choose Jincheng Graphite?
- Wide grade selection - from general-purpose to ultra-fine grain EDM grades
- Raw blocks and finished electrodes - we supply both billet stock and machined electrode sets
- CNC pre-machining service - rough-machined to your CAD files, saving your machining time
- Consistent batch quality - every block meets certified density and resistivity specs
- Competitive pricing - direct from our own graphite processing factory
- Fast stock availability - standard sizes in stock for immediate shipment
- Technical support - help selecting the optimal grade for your EDM finish requirements
- Export worldwide - serving mold makers in 20+ countries
FAQ
Q: Which graphite grade should I choose for mirror EDM finish?
A: For mirror or high-gloss EDM finishes, choose an ultra-fine grain grade with particle size below 8 µm and low ash content. These grades provide the finest surface texture and minimize micro-pitting during finishing discharges.
Q: Can you machine finished graphite electrodes to our CAD files?
A: Yes. Send us your STEP/IGES files or drawings, and we will CNC-machine rough and finish electrodes with your specified tolerances. We can supply individual electrodes or complete electrode sets for multi-cavity molds.
Q: How does graphite compare to copper for EDM?
A: Graphite machines 3-5x faster, weighs 80% less, exhibits lower electrode wear in finishing, and can be machined into delicate geometries without deformation. Copper is still preferred for extremely fine micro-EDM applications below 50 µm feature size.
Q: What is your minimum order quantity?
A: We accept single-block orders for trial evaluation, and bulk pallet orders for production. Standard sizes are available from one piece.
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