Quality control for blast furnace drilling tools should follow the product from raw material through final packing. A finished part can look acceptable while hiding a material defect, incorrect heat treatment, or dimensional variation that will cause rapid failure. A structured inspection plan reduces that risk and makes quality results traceable.
1. Incoming Material Inspection
Verify steel grade, surface condition, and material documentation before production. Carbide tips should be checked for grade, dimensions, and visible defects. Material certificates and batch records help trace any issue that appears later.
2. In-Process Dimensional Checks
Measure critical diameters, lengths, shoulders, and machining features against the approved drawing. Confirm that tolerances remain stable throughout the batch. For drill rods, check straightness and end-face condition before thread machining.
3. Thread and Connection Inspection
- Thread profile and pitch must match the specification.
- No burrs, cracks, galling, or deep handling marks are allowed.
- Mating rods, sleeves, or adapters should assemble smoothly.
- Shoulders must provide correct contact.
- Connections should remain stable under the intended tightening method.
4. Carbide Tip Inspection
Inspect button placement, protrusion, spacing, and bond quality. Look for cracks, chips, missing tips, or uneven seating. The cutting face should match the approved layout and provide the intended gauge and flushing clearance.
5. Hardness and Performance Sampling
Depending on the product, check hardness at defined locations and review heat-treatment records. Wear and impact testing can be performed on representative samples when a new material or design is introduced. Test results should be compared with the approved baseline rather than treated as isolated numbers.
6. Final Inspection and Packing
Before packing, confirm product identity, quantity, dimensions, surface condition, and thread protection. Use packaging suitable for the shipping method and clearly label the product, size, and batch. Rust-preventive treatment may be required for long transit or humid storage.
Make Inspection a Feedback Loop
Quality control is most useful when service data returns to the factory. Record customer observations such as thread loosening, rapid carbide wear, bending, or short service life. That information can guide improvements in material, machining, heat treatment, or product selection. Shandong Feiteng welcomes detailed technical feedback so future batches can be matched more closely to actual furnace conditions.