Die Sinking EDM Machining Services
Our Sinker EDM Machining service is dedicated to the creation of complex and small features with high precision. We cater to die & mold manufacturing and other numerous industries.
- Tolerance as low as ±0.004 mm
- Handling of hard and difficult materials, tool steel, etc.
- A quick lead time of 3 days
- Deep cavities, grooves, and detailed holes
Our Die Sinking EDM Service
At ProleanTech, we have EDM setups with advanced control systems. This allows our expert engineers and operators to achieve a higher level of precision and intricate features like small holes and deep cavities. Since we can customize the electrode, you don’t need to worry about the complexity of your design.
We handle almost every engineering material if they are conductive. Our EDM services guarantees you precise and affordable parts from our Sinker EDM factory.
- 4 Axis (XYZC), Travels up to 23.62” x 15.75” x 17.72” thick
- Standard tolerances down to +/-.0005”
- Process Engineering & CAD / CAM Support
- First Article, In Process & Final Inspection
- Extensive GD&T knowledge
- Carbide Cutting Capabilities
- Excellent for hardened and difficult to machine materials
- Advanced technology that minimizes heat affected zone (HAZ)
Die Sinking EDM Capabilities
Die Sinking EDM (also known as Sinker EDM, Ram EDM, or Cavity EDM) is a specialized thermal-erosion manufacturing process. It uses a pre-formed, three-dimensional electrode (typically made of graphite or copper) to burn exact, complex cavities, blind pockets, and sharp internal corners into hardened conductive metals without direct mechanical contact. It is indispensable in modern mold making, aerospace, and precision tooling.
| Machine Category | Typical Performance & Precision | Primary Applications |
|---|---|---|
| Entry-Level / Conventional Sinker EDM | Accuracy: ±0.01~0.02 mmSurface Finish: Moderate (Ra 0.8~1.6µm) | General stamping and plastic injection moldsSimple cavity roughing and basic maintenance work |
| High-End CNC Sinker EDM (Industrial Standard) | Accuracy: ±0.003~0.005 mmSurface Finish: Fine (Ra 0.2~0.8µm) | High-precision injection molds (automotive, electronics)Die-casting dies and complex forging tools |
| Micro / Mirror-Finish Sinker EDM (High-Tech) | Accuracy: ±0.001~0.002mm Surface Finish: Superior Mirror Finish (Ra ≤0.1µm) | Micro-electronics molds, optical lenses, and medical implantsHigh-density micro-hole arrays and fine connectors |
Advantages of Die Sinking EDM
Complex 3D Cavities
Effortlessly machines intricate three-dimensional shapes, blind pockets, and deep internal features that traditional milling cannot reach.
Internal Sharp Corners
Replicates sharp internal angles, tight radii, and precise square corners without the tool-radius limitations of rotary milling.
High-Hardness Materials
Effectively cuts any conductive material regardless of its hardness, including hardened tool steels and tungsten carbide.
Zero Mechanical Force
Avoids direct tool-workpiece contact, completely preventing clamping distortion in delicate or thin-walled components.
Exceptional Precision & Replication
Delivers high dimensional accuracy and fine surface textures by faithfully copying the pre-machined 3D electrode profile.
Multi-Axis & Planetary Flexibility
Enables advanced machining through C-axis rotation, helical interpolation, and multi-axis orbiting to expand geometric possibilities.
Die Sinking EDM Materials
RapidDirect’s Die Sinnking EDM services efficiently machine a wide range of conductive materials, including tough superalloys and hardened steels, ensuring precise and durable components for demanding industries.
Tool & Mold Steels
Ideal for hardened steels used in injection and stamping molds, effortlessly shaping high-hardness metals regardless of pre-heat treatment status.
Superhard Alloys
Easily processes rigid, wear-resistant alloys that are extremely difficult or impossible to cut using conventional milling and machining methods.
Aerospace Superalloys
Accurately erodes high-temperature and exotic metals critical for aerospace, defense, and power generation components demanding extreme durability.
Material Selection Assistance
Not sure which material is best for your application? Our engineering team can help you select the optimal material based on your performance requirements, budget, and application environment.
Wire EDM Finishes
Due to its unique electrical discharge erosion principle, EDM leaves microscopic discharge craters, a recast layer (white layer), and certain micro-stresses on the workpiece surface. Therefore, depending on the product's application scenario (such as molds, aerospace components, or precision mechanical parts), several common surface treatment processes are typically employed to improve performance
Removal of Re-melted Layer & Micro-Cracks
Mild chemical pickling, electropolishing, or light abrasive blasting / grinding is used to remove this altered layer and relieve residual surface stresses.Mechanical Polishing & Mirror Finishing
Manual polishing, ultrasonic polishing, or diamond paste lapping is performed to step-by-step refine the rough EDM texture ($Ra$) down to SPI A1–A3 mirror finishes or specific VDI texture standards.Chemical Texturing / Etching
Following EDM, chemical etching is applied to bite uniform patterns into the surface, which requires the initial EDM baseline finish to be exceptionally consistent.Surface Coatings (PVD / CVD)
Post-machining or polishing, parts often undergo PVD (Physical Vapor Deposition) or CVD (Chemical Vapor Deposition) treatments, applying coatings such as TiN (Titanium Nitride), TiAlN, or DLC (Diamond-Like Carbon).Cleaning & Deburring
Rigorous ultrasonic cleaning and rust-inhibiting treatments are mandatory to ensure the surface is completely free of oil, residue, and carbon black.Custom Finishing Solutions:
Don’t see the finish you need? Contact our team to discuss custom finishing options for your specific application requirements.
Our Custom EDM Services For Various Industrial Applications
TiRapid delivers precision machining solutions to industries where accuracy and reliability are non-negotiable. Our services support:
Aerospace & Defense
Medical & Dental
Automation
Consummer Goods
Automotive
Robotics
Frequently Asked Questions
CNCPOR is committed to providing efficient and reliable machining service support through transparent information sharing.
01. What is the typical machining accuracy and tolerance you can achieve?
Depending on the machine specification and process stages (roughing vs. finishing), we routinely achieve dimensional tolerances of ±0.005mm to ±0.01mm (and up to ±0.001mm for high-precision micro-EDM applications).
02. Who provides the electrodes, and what materials are used?
Electrodes are typically custom-made based on your 3D CAD models. We primarily use Graphite for high-speed, general-purpose cavity sinking and Copper (Cu) or Tellurium Copper for fine-detail work, micro-features, and superior mirror-finish requirements. We can manufacture the electrodes in-house or accept customer-supplied electrodes.
03. Can Die-Sinking EDM achieve sharp internal corners?
Yes. Unlike traditional CNC milling—which is restricted by the round radius of the rotating cutting tool—Die-Sinking EDM can replicate sharp internal 90° corners and tight radii faithfully from a pre-machined electrode.
04. What surface finish (Ra / VDI) can be expected after EDM?
The surface finish depends on the electrical parameters used in the final finishing pass. We can tailor the texture from standard functional finishes down to a fine Ra 0.2~0.8µm or high-end SPI / VDI mirror finish standards for plastic injection molds.
05. How do you handle the recast layer (white layer) and micro-cracks on the EDM surface?
Due to the thermal-erosion nature of EDM, a thin recast layer is naturally formed. For critical applications, we offer post-processing treatments such as micro-blasting, chemical pickling, or manual/ultrasonic polishing to remove this layer and relieve residual stresses.
06. What file formats do you accept for quotation and programming?
We accept standard 3D CAD formats including STEP, IGES, XT, and SolidWorks files, alongside 2D engineering drawings (PDF) detailing critical tolerances, surface roughness (Ra or VDI), and electrode clearance requirements.
Get a Quote for Your Die Sinking EDM Projects Today
Ready to take advantage of our top-tier Die Sinking EDM services? Contact us now for a personalized quote tailored to your specific project needs.