Carbide PCB Corner Rounding Cutter

As a China Manufacturer, Winway offers the Carbide PCB Corner Rounding Cutter, a specialized disc-type milling cutter for PCB production lines. The disc body is assembled with tungsten-steel cutting teeth featuring pre-formed arc cutting edges. It completes board-edge R-angle processing in one pass on round-corner machines. Featuring a 6-tooth structure and low-noise disc-body design, it achieves low cutting vibration and noise together with stable R-angle dimensions. It is mainly used for edge round-corner processing of large-size PCB panels such as FR-4 and aluminum-base boards, and fits mass-volume production. Custom non-standard outer diameter, inner hole, tooth quantity and R-angle are supported.

Product Definition

Carbide PCB Corner Rounding Cutter is a special-purpose PCB machining tool composed of a disc-shaped body and cemented-carbide (tungsten-steel) forming cutter teeth. With preset arc-shaped forming cutting edges, it mills standard R round corners on the edges of large-size PCB panels in one pass, eliminates sharp board edges and helps avoid assembly-scratch and short-circuit risks. It is widely used in PCB contour edge-rounding procedures.

Key Technical Features

1.Cutter tooth material: Ultra-fine-grain tungsten steel (cemented carbide), high-hardness, wear-resistant and chipping-resistant for long service life.
2.6-tooth forming structure with low-noise disc-body design, low cutting vibration and low machining noise.
3.Precisely ground forming arc cutting edge, high R-angle accuracy and good round-corner consistency within same batch.
4.Polished cutting edge for smooth chip evacuation, reducing board chipping, substrate whitening and board-edge burrs.
5.Standard inner-hole positioning, high clamping concentricity for stable machining and less chatter marks.
6.Full-item customization available: outer diameter, inner hole, tooth quantity and R-angle can be produced per customer drawings.

Specification Table（Sample Specifications）

Outer Diameter D	Inner Hole	Thickness	Teeth	R Angle
103	19	23	6T	R7.5
93	25	19	6T	R5.0
93	30	19	6T	R8
93	25	19	6Z	R5.0
83	30	19	6T	R6.0

Applicable Board List

FR-4 fiberglass board (single-/double-/multi-layer large-size PCB panel)

Aluminum-base PCB

CEM-1 / CEM-3 composite insulation board

Heavy-copper PCB

Flame-retardant insulation board

Not applicable: pure soft rubber sheet, thick solid-metal plate, high-hardness ceramic plate

Machine Operation Points

1.Clamping: Clean spindle and disc inner hole to remove dust and debris, lock firmly and verify concentricity; control runout ≤0.005 mm.
2.Trial cutting: Perform trial cutting on sample panel first; inspect R-angle dimension, chipping and whitening; confirm stable parameters before mass production.
3.Machining method: Climb-milling is preferred to avoid chipping caused by conventional milling; panels must be tightly clamped to prevent shifting.
4.Cooling: Adopt air blowing for dust removal; small-dose atomized cooling is allowed; avoid soaking panels with liquid water.

Quick Troubleshooting

Phenomenon	Possible Cause	Quick Solution
Board-edge chipping & substrate whitening	Excessive feed rate, worn cutter teeth, mismatched spindle speed	Reduce feed rate; inspect cutting-tooth wear; adjust spindle speed
Inconsistent R-angle dimension	Large clamping runout, loose panel positioning	Re-clean inner hole and lock cutter; reinforce panel fixture
Cutter-tooth chipping	Impurities inside panel, collision impact, excessive feed rate	Check panel impurities; lower feed rate; prevent disc collision
Chatter marks & high noise during machining	Loosely locked cutter disc, worn cutter teeth	Re-lock cutter disc; inspect / replace worn teeth
Heavy burrs on board edge	Worn cutting teeth	Send back to factory for forming-edge re-grinding

Maintenance Requirements

1.After each machining cycle, blow resin dust and glass-fiber debris off disc and cutter teeth with air gun; never scrape tungsten-steel cutting edges with hard objects.
2.Storage: Keep in dedicated tool box separately; avoid mutual collision; no stacking or bare placement.
3.Periodic inspection: Stop machine immediately when cutter-tooth notch or wear-induced whitening occurs and send to factory for grinding repair.
4.Forbid dropping or impacting cutter disc: Tungsten-steel teeth are brittle; impact easily causes tooth chipping and scrapping.
5.For long-term storage, apply anti-rust treatment on metal disc body to prevent inner-hole rust which harms clamping accuracy.

FAQ

Q1: Can worn teeth of the Carbide PCB Corner Rounding Cutter be sent for re-grinding?

A1: Yes. Re-grinding for forming R-angle is available if only cutting-edge wear exists without large-area tooth chipping. If teeth suffer severe chipping, tooth replacement is required.

Q2: Can the radius (R) of the radius cutter be modified?

A2: Yes. The R angle can be reground to a larger size as required, but it cannot be made smaller. We can also directly custom-make cutter teeth with different R angles.

Q3: How to solve aluminum sticking when machining aluminum-base PCB?

A3: Appropriately raise spindle speed and reduce feed rate; strengthen air-blowing cooling; adopt high-gloss polished cutting-edge to reduce aluminum-chip adhesion.

Q4: Can non-standard inner hole, outer diameter and tooth quantity be customized?

A4: Full-parameter customization is supported. Provide PCB panel thickness, machining drawing and capacity requirement for lead-time and quotation evaluation.

Q5: What is the principle of low-noise design?

A5: The disc body adopts noise-reduction slot structure. Optimized 6-tooth cutting angle disperses cutting impact and suppresses resonance, bringing obviously lower noise compared with ordinary cutter discs.