Round-Mouth Flow Drill Friction Drilling Bit
Form High-Strength Threaded Bushings in Sheet Metal & Tubing Without Fasteners
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Features
Thermal Friction Flow Forming: Operates at 600°C+ to plasticize metal and extrude a strong threaded bushing in seconds.
Replaces Rivet & Weld Nuts: Creates a monolithic extruded boss with 3x the original sheet metal wall thickness.
Ultra-Hard Tungsten Carbide: Micro-grain solid carbide substrate provides extreme heat resistance and 10,000+ hole tool life.
Round-Mouth Smooth Edge: Forms a rounded, smooth collar rim that eliminates sharp edges on tubing and sheet metal.
In-Depth Engineering Description & Technical Overview
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Process Overview
The Round-Mouth Flow Drill Friction Drilling Bit from DUOMI CNC utilizes high rotational speeds (1,500 – 3,200 RPM) and controlled axial pressure to generate intense local frictional heat (600°C – 800°C). This thermal energy plasticizes thin-walled metal workpieces, allowing the bit to plunge through and re-shape the displaced material into a strong, integral bushing. The round-mouth design creates a prominent upper collar/bulge, maximizing usable thread depth without requiring weld nuts, blind rivets, or threaded inserts.
Key Features & Operational Benefits
- Integrated Bushing Collar: Generates a clean, rounded upper collar (bulge) and an extended lower neck, increasing wall thickness up to 3x the original sheet thickness.
- Fast Cycle Times: Completes hole formation and bushing shaping in just 2 to 6 seconds, significantly boosting production line throughput.
- Eliminates Secondary Fasteners: Replaces expensive rivet nuts, weld nuts, and press-fit inserts, reducing bill-of-materials (BOM) costs by up to 50%.
- Chipless Drilling Process: Thermal plastic deformation generates zero metal swarf or chips, protecting sensitive internal assemblies and reducing material waste.
- High Material Compatibility: Engineered for ductile metals including mild steel, stainless steel, aluminum, copper, brass, and zinc alloys.
Technical Advantages & Engineering Precision
Thread Shear Strength
By cold-forming threads into the newly created friction-drilled bushing using a thread forming tap, thread shear resistance increases by over 100% compared to standard tapped sheet metal.
Tool Longevity & Thermal Resistance
Constructed from premium tungsten carbide (HM) alloys engineered to withstand extreme thermal shock and mechanical wear, providing an average operational lifespan of 3,000 to 10,000 holes under optimal cooling and lubrication conditions.
Industrial Applications
Widely deployed in automotive chassis fabrication, HVAC ducting, structural steel tubing, agricultural machinery, and OEM enclosure manufacturing.
Operating Parameters & Guidelines
| Parameter | Value / Recommendation |
|---|---|
| Spindle Speed Range | 1,500 – 3,500 RPM (dependent on hole diameter and material) |
| Feed Rate | 100 – 400 mm/min |
| Forming Heat Range | 600°C – 800°C |
| Applicable Wall Thickness | 0.8 mm – 12.0 mm |
| Quality Standard | ISO 9001:2015 Manufacturing & CE Compliant |
Purchase & Delivery Guarantees
Direct Factory Assurance — Built, Tested, and Supported from Dongguan to Your Shop Floor
Runs on Your System
Standard GSK control (100% Fanuc G-code compatible) or optional Mitsubishi/Siemens. Direct CAD file import for code-free toolpath generation.
Factory Video FAT
Live drilling/tapping tests on your actual workpiece recorded before dispatch. Final 50% balance payment is paid only after your video approval.
40-Day Build & Rugged Crate
Guaranteed maximum 40-day manufacturing cycle. Sealed in anti-rust vacuum aluminum foil and bolted in fumigation-free timber crates (EXW/FOB/CIF).
Direct Engineer Care
Direct 1-on-1 WhatsApp group with your machine's build engineers, 12-month full warranty, and critical replacement parts dispatched via DHL within 24–48h.
Every DUOMI machine is built under a transparent 13-step factory production & responsibility chain.
Machining Samples
Real parts processed by our machines
