QDZRT Graphite supplies drawing-based graphite cutting, CNC milling and turning for common industrial parts, with practical dimensional inspection and export packaging.
Our standard reference capability covers spindle speeds up to 12,000 RPM, normal dimensional tolerance of ±0.05 mm, suitable precision features to ±0.02 mm, turning up to Ø400 × 1,000 mm, typical Ra 1.6–3.2 μm, and coaxiality/runout of 0.03–0.05 mm.
| Machining Process | Equipment & Tooling Matrix | Working Envelope / Capacity | Achievable Tolerance | Surface Finish / Typical Parts | Environment & Contamination Control |
|---|---|---|---|---|---|
| 5-Axis & 3-Axis CNC High-Speed Milling | CNC milling centers, spindle speed up to 12,000 RPM, carbide or diamond-coated cutters selected by part | Working envelope up to 1500 × 1200 × 600 mm |
Normal tolerance ±0.05 mm; suitable precision features to ±0.02 mm after drawing review | Surface finish Ra 0.8–1.6 μm (optically fine Ra 0.4 μm upon request) | Enclosed negative-pressure dry extraction to help control conductive graphite dust contamination |
| Precision CNC Turning & Cylindrical Lathes | Heavy-duty & high-speed CNC lathes with customized positive-rake PCD inserts | Maximum reference turning size: Ø400 mm × 1,000 mm |
Coaxiality and runout typically 0.03–0.05 mm | Precision turned shafts, degasser rotors, heaters and threaded electrodes | Point-of-cut vacuum shrouded extraction with secondary HEPA containment |
| Precision Surface & Creep-Feed Grinding | High-precision surface grinders equipped with vitrified diamond wheels | Maximum grinding plate dimensions up to 1200 × 600 mm |
Normal dimensional tolerance ±0.05 mm; tighter requirements reviewed against the drawing | Mirror/fine surface Ra 0.2–0.4 μm for vacuum furnace trays and seal faces | Controlled dry extraction or dedicated oil-mist filtration for ultra-fine surfaces |
| Deep-Hole Drilling & Complex Trepanning | Rigid diamond-coated carbide gun drills and micro-peck cycles | Depth-to-diameter ratio up to 30:1 (hole diameters Ø0.5 mm to Ø150 mm) |
Hole drift ≤0.1 mm per 500 mm depth; exit breakthrough without chipping | Long degassing lance tubes, thermocouple wells and cooling channels | Through-tool vacuum scavenging ensuring complete internal dust removal |
QDZRT Graphite deploys multi-flute PCD and thick-film CVD diamond-coated tooling across all production lines. Ultra-hard cutting edges help minimize tool wear and micro-chipping, supporting dimensional consistency across multi-thousand-piece production runs.
Our proprietary machining kinematics, low-vibration vacuum chucking, and multi-stage support fixturing allow the reliable production of thin ribs down to 0.2 mm, narrow slots, sharp external edges, and fragile internal threads without breakthrough fracture.
Graphite machining is conducted in dedicated negative-pressure machining bays equipped with high-volume point-of-cut cyclone extractors and multi-stage HEPA filtration. This helps reduce conductive dust recirculation, machine contamination, and atmospheric cross-contamination.
Every production batch is verified against drawing datums using precision coordinate measuring equipment (CMM), optical video comparators, and surface roughness profilometers. Batch inspection records and CoAs accompany shipments upon request.
Following precision machining, components undergo multi-stage ultrasonic de-dusting, high-pressure ionized nitrogen blowing, and vacuum thermal baking to remove loose micro-particles and reduce residual particulate contamination. Finished goods are sealed in multi-layer antistatic barrier bags with custom EPE foam.
To meet demanding high-temperature and metallurgical application requirements, QDZRT Graphite offers secondary processing capabilities including high-temperature gas purification (ash content ≤20 ppm), vacuum resin or pitch impregnation, and surface protection treatments.
By reviewing client drawings before production, QDZRT Graphite identifies brittle features, reduces stress concentrations, and optimizes cutting geometry to improve machining reliability and part yield.
| Part Feature / Risk Area | Risk / Issue Underlying Manufacturing Risk | Review Note What We Review Before Quotation |
|---|---|---|
| Sharp Internal Corners (R < 0.2 mm) | Milling tools have finite radii; sharp internal corners generate stress concentration and risk micro-cracking under thermal cycling. | We review internal radii and tool access; sharp corners may require relief geometry or a larger radius depending on cutter access. |
| Thin Unsupported Ribs & Walls (< 0.5 mm) | Excessive tool cutting pressure or clamping vibration on tall, fragile ribs can cause deflection, taper errors, or root chipping. | We review unsupported wall height, thickness and fixturing needs; thin features may require staged cutting or dedicated support. |
| Through-Hole Breakthrough Flaking | Drill thrust force at the breakthrough face can chip brittle graphite exit edges if unsupported. | We review hole depth, exit geometry and support conditions; backing, staged drilling or edge preparation may be proposed before quotation. |
| Over-Specified Tolerances on Non-Critical Features | Applying tight tolerances across non-mating reliefs, clearances, or chamfers increases cycle time and tool wear without functional improvement. | We distinguish functional tolerances from general dimensions and confirm achievable values and inspection points during drawing review. |
| Thread Root Shearing in Brittle Carbon | Standard coarse v-threads can experience shear failure if over-torqued during final installation. | We review thread form, engagement and assembly load; modified root geometry or inserts may be recommended for repeated assembly. |
| Surface Particle Contamination in Cleanrooms | Residual conductive graphite dust lodged in porous surfaces can shed during furnace operation or cleanroom assembly. | If cleanliness is critical, state the acceptance requirement so the cleaning method, inspection and protective packaging can be included in the quotation. |
When you send a drawing, our engineering team reviews wall thickness, edge geometry, holes, datums, tolerances and surface requirements before confirming manufacturability and quotation.
During drawing review, we check wall thickness, unsupported height and feature geometry against the selected graphite grade. Very thin ribs or EDM fins are confirmed case by case before quotation.
We review internal radii, corner access and cutter clearance. Sharp internal corners may require relief geometry or a larger radius depending on part size and tool access.
We review hole depth, diameter, straightness, exit geometry and inspection access. High aspect-ratio holes are confirmed from the drawing before the machining plan is quoted.
We review thread form, engagement length and assembly load for brittle graphite. Modified root geometry or inserts may be recommended when repeated assembly or higher load is expected.
We separate critical fits and locating datums from general dimensions, then confirm achievable tolerances and inspection points in the quotation and drawing review.
We review datum surfaces, flatness, parallelism, part size and graphite grade together. The machining and inspection plan is confirmed from the drawing before production.
Provide operating temperature, atmosphere or process gas, thermal cycle and contamination limits so we can review the material and any required secondary treatment.
| Operating Atmosphere / Environment | Information to Confirm | Service Risk to Review | Project Review / Optional Treatment |
|---|---|---|---|
| Air / Oxidizing Atmosphere | Oxygen exposure / oxidation rate |
Graphite oxidizes in the presence of oxygen, with oxidation rate governed by temperature, grade, porosity, airflow and contaminants. | Set the service temperature and oxidation allowance from the process conditions; use a specified protective treatment for oxidation-controlled service. |
| Vacuum | Vacuum level / thermal cycle |
Vacuum suppresses oxidation by excluding oxygen; furnace pressure, contaminants, load and material grade define the service condition. | Select graphite grade, section size and design from the vacuum level and thermal cycle. |
| Inert Gas | Gas purity / thermal cycle |
Argon and other inert environments support high-temperature graphite service when oxygen and moisture are controlled. | Specify gas purity, maximum temperature, thermal cycling and material compatibility. |
| Nitrogen / Process Gas | Gas chemistry / process temperature |
Temperature, gas chemistry, impurities and adjacent furnace materials govern graphite behavior in process gas. | Define the complete process atmosphere and temperature cycle in the material selection specification. |
Special coatings and impregnation are quoted as defined secondary processes. State the treatment type, graphite substrate, service conditions and acceptance criteria in the inquiry.
| Coating / Treatment Type | Treatment Form | Service Basis | Quotation / Service Note |
|---|---|---|---|
| Antioxidant Surface Treatment | Coating process | Oxidation-service specification |
Used to reduce oxidation exposure in furnace service; the treatment specification defines substrate, coating system and acceptance criteria. |
| SiC / Specialty Coating | Coating specification | Thermal / chemical service specification |
Used for thermal and chemical protection in specified furnace and process applications; the order specification defines substrate, coating system and inspection criteria. |
| Resin / Metal Impregnation | Pore impregnation | Sealing / wear service |
Used to modify permeability, wear and sealing behavior in mechanical applications. |
We accept 3D CAD models in STEP (.step, .stp), IGES (.igs), and Parasolid (.x_t) formats alongside 2D PDF or DWG/DXF drawings specifying critical tolerances, datum features, surface roughness, and required inspection points.
Lead times depend on current factory production scheduling, raw graphite stock availability, batch quantity, and processing complexity. Prototype or first-article feasibility is reviewed after drawing confirmation, while production batches are confirmed with a formal delivery schedule per purchase order. For overseas orders, additional time for export compliance screening, customs clearance, and international logistics should also be factored in.
Yes. Production runs can be verified with documented inspection records, coordinate metrology reports for critical drawing datums, and batch Certificates of Analysis (CoA) confirming material density and specification compliance.
Components are individually sealed in antistatic vacuum barrier bags, embedded in precision CNC-cut multi-tier EPE foam trays, packed in heavy-duty corrugated cartons, and crated in fumigation-free plywood or IPPC heat-treated export crates.
Yes. Our materials engineering team analyzes your operating temperatures, thermal cycling, corrosive atmosphere, mechanical loading, and electrical resistivity requirements to recommend the optimal isostatic, molded, or extruded graphite grade.
We support drawing-based graphite cutting and CNC machining. Submit the inquiry first, then send a 2D/3D drawing by email for material selection, manufacturability review, tolerance confirmation and quotation.