02 / MATERIAL & PROCESS

Manufacturing & QC

From diamond grit and matrix bonds to forming, sintering, welding and inspection. Explore the essential process controls.

Material concept of diamond grit and metal-bond segmentsCONCEPT VISUAL

Manufacturing Stages & Buyer Review Points

Process overview; confirm equipment, inspection, and batch records against order documents

Raw Material Testing & Diamond Grading

Crushing strength, thermal impact toughness (TI/TTI) and powder purity assays

For procurement, confirm diamond grit and grade, bond powder composition, and incoming inspection records. Sampling and acceptance criteria depend on the supplied batch.

Quality checkpoints:

Diamond crystal strength and grading method

Thermal stability criteria by specification

Metal powder particle-size records if applicable

Equipment examples to confirm: Static Crystal Toughness Tester / Laser Particle Analyzer

Granulation & Precision Cold Pressing

Review blending uniformity, piece weight, and layer alignment during cold pressing

Powder blending and green-segment pressing affect layer alignment and piece weight. Confirm equipment, tolerance, and sampling records by product specification.

Quality checkpoints:

Green compact density by specification

Piece-weight tolerance by specification

Layer alignment if applicable

Equipment examples to confirm: Multi-station CNC Automated Cold Press / Precision Microbalance

Computer-Controlled Vacuum Hot-Press Sintering

Confirm sintering temperature, pressure profile, and segment density by formula

Sintering conditions affect bond performance. Buyers may request temperature, pressure, and hardness records for the supplied formula; confirm actual equipment and batch records.

Quality checkpoints:

Temperature record by formula

Pressure profile by formula

Hardness sampling by order

Equipment examples to confirm: Vacuum High-Frequency Sintering Machine / Rockwell Hardness Tester

High-Frequency Induction Brazing & Laser Welding

Confirm welding method, joint strength, and inspection method by product

Brazing and laser welding depend on tool design and application. Confirm joint method, strength testing, and applicable safety standards in product documents.

Quality checkpoints:

Segment alignment by drawing

Welding temperature process record if applicable

Joint-strength test by product specification

Equipment examples to confirm: brazing, welding, and shear-test systems

Core Tensioning, Flattening & Runout Inspection

Manual tension leveling by master smiths plus laser dial indicators with runout limits to be confirmed by specification

Blade stability at high peripheral speeds hinges on uniform internal core tension. Core tension, axial runout, and radial runout are procurement inspection points. Confirm test method, sampling, and acceptance limits in the order documents.

Quality checkpoints:

Core flatness by drawing

Axial and radial runout by specification

Bore and pin-hole dimensions by drawing

Equipment examples to confirm: runout gauge / tension tester

Edge Dressing, Rust Prevention & Export Packaging

Confirm dressing, rust prevention, and shipping packaging per order

Confirm dressing, rust prevention, and carton construction per product and shipping mode. Inspect appearance, dimensions, and fitment before a trial cut.

Quality checkpoints:

Dressing depth by specification

Rust protection method by shipping mode

Packaging compression or drop test if required

Dressing and packaging method to confirm per order

Incoming, In-Process & Outgoing Inspection Checklist

Confirm test methods, sampling, and acceptance limits in the purchase specification

QC Stage	Inspection Item	Testing Method	Acceptance Criteria
Incoming QC (IQC)	Diamond Crystal Crushing Strength	Single-grain compression tester (sampling per agreement)	Confirm method, sampling, and limit in the order documents
Incoming QC (IQC)	75Cr1 Alloy Steel Core Flatness	Granite surface plate with micrometer dial indicator	Confirm method, sampling, and limit in the order documents
In-Process QC (IPQC)	Sintered Segment Hardness & TRS	Metallographic cross-section Vickers / 3-point bend test	Confirm method, sampling, and limit in the order documents
In-Process QC (IPQC)	Brazed / Welded Seam Shear Strength	Hydraulic torque shear push tester	Confirm method, sampling, and limit in the order documents
Outgoing QC (OQC)	Axial Face Runout & Radial Runout	Dual-axis precision laser runout measuring bench	Confirm method, sampling, and limit in the order documents
Outgoing QC (OQC)	Burst Safety Limit Overspeed Test	Enclosed armor spin chamber overspeed test	Confirm method, sampling, and limit in the order documents

Batch Traceability & Heavy Export Packaging

1. Laser Batch Codes

Specify batch marking, formula IDs, and sample retention in the order, then verify against actual batch records.

2. Anti-Corrosion Treatment

Confirm rust prevention for the transport environment and product material; inspect surface cleanliness and moisture protection before shipment.

3. Export Palletization

Confirm carton, corner protection, and pallet specifications for product size, weight, and destination.