Isostatic Graphite Die for Diamond Wire Drawing and Bearing
Product Overview
Our high-precision isostatic graphite dies are designed for diamond wire drawing and diamond bearing manufacturing, where ultra-fine surface finish and extreme dimensional accuracy are critical. These graphite molds are precision-machined from fine-grain, high-purity isostatic graphite with pore sizes below 8 µm, enabling the production of smooth, defect-free diamond wire dies with mirror-finish internal profiles. The graphite die serves as the shaping and sintering tool for polycrystalline diamond compacts (PDC) during high-pressure, high-temperature (HPHT) diamond synthesis.
In diamond wire manufacturing, graphite dies and holders must maintain precise geometry at temperatures up to 1500°C under high pressure, while not reacting with the diamond powder or catalyst metals. At Jincheng Graphite, we manufacture graphite die sets, graphite sleeves, and graphite pusher cylinders for HPHT diamond presses, with inner diameters as small as 0.5 mm and surface finishes down to Ra 0.2 µm. Our dies are trusted by diamond wire and PCD tool manufacturers for their consistency, durability, and dimensional precision.
Key Features
- Ultra-fine grain structure - average grain size 5-8 µm for mirror-finish internal surfaces
- High purity - ash content < 300 ppm to prevent diamond contamination
- Extreme dimensional precision - inner diameter tolerances as tight as ±0.005 mm
- Mirror surface finish - Ra 0.2 - 0.4 µm for smooth diamond wire dies
- High temperature resistance - stable up to 1600°C under HPHT conditions
- Excellent machinability - can be precision-turned, bored, and honed to complex profiles
- Consistent lot-to-lot quality - uniform density and hardness across every die
- Custom die geometries - cylindrical, conical, and shaped die bores per customer drawings
Technical Specifications
| Parameter | Value |
|---|---|
| Material | Ultra-fine grain isostatic graphite |
| Average Grain Size | 5 - 8 µm |
| Bulk Density | 1.82 - 1.88 g/cm³ |
| Shore Hardness | 65 - 75 HS |
| Flexural Strength | 55 - 70 MPa |
| Compressive Strength | 90 - 120 MPa |
| Electrical Resistivity | 12 - 15 µΩ·m |
| Ash Content | < 300 ppm |
| Min Bore Diameter | 0.5 mm |
| Bore Tolerance | ±0.005 mm (precision) |
| Surface Finish (bore) | Ra 0.2 - 0.4 µm |
| Max Temperature | 1600°C |
Applications
- PCD diamond wire drawing dies - graphite dies for manufacturing diamond wire drawing dies
- HPHT synthetic diamond - graphite capsules and dies for diamond crystal growth
- PCD cutting tools - graphite molds for polycrystalline diamond compact inserts
- Diamond dressing tools - graphite die holders for single-point diamond tools
- Cubic boron nitride (CBN) compacts - graphite sintering molds for CBN tool blanks
- Precision wire drawing - graphite dies for fine copper and steel wire drawing
Why Choose Jincheng Graphite?
- Precision machining expertise - micro-boring and honing capabilities for sub-millimeter die bores
- Ultra-fine grain material - sourced from premium isostatic graphite blocks
- Metrology-certified - every die bore measured and inspected before shipment
- Custom die sets - complete die, sleeve, and pusher assemblies for HPHT presses
- Fast sample turnaround - prototype dies within 7-10 business days
- Competitive pricing - factory-direct cost for precision graphite tooling
- Long-term supply partnership - consistent repeat orders for diamond tool manufacturers
- Export worldwide - shipping to diamond tool factories in China, India, and Europe
FAQ
Q: What is the smallest bore diameter you can machine?
A: We can machine precision die bores as small as 0.5 mm in diameter with tolerances of ±0.005 mm. For extremely small or complex profiles, we use diamond honing and internal grinding techniques to achieve the required surface finish.
Q: How many times can a graphite HPHT die be reused?
A: Under controlled HPHT conditions, graphite dies and capsules are typically single-use or limited to 2-3 sintering cycles, because the high-pressure and high-temperature environment causes gradual surface erosion and deformation. We recommend fresh dies for critical PCD tool production.
Q: Do you supply complete die sets for HPHT presses?
A: Yes. We supply complete graphite capsule sets including the die, inner sleeve, outer sleeve, upper and lower pushers, and gaskets, manufactured to match your specific press model and diamond synthesis recipe.
Q: Can you replicate dies from a sample?
A: Yes. Send us a used die or a drawing, and we will reverse-engineer the dimensions, tolerances, and material grade to produce a matching replacement.
Hot Tags: isostatic graphite die for diamond wire drawing and bearing, China isostatic graphite die for diamond wire drawing and bearing manufacturers, suppliers, factory, die casting injection molding, fuel cell bipolar plate, graphite mold, high quality graphite mold, zamak injection molding, zinc casting mold
