CNCフライス加工とは？
CNCフライス加工は、コンピュータ制御の回転切削工具が固体ワークピースから材料を除去するサブトラクティブ加工プロセスです。 Unlike turning — which spins the part — milling spins the tool and moves it across a stationary or indexed workpiece along multiple linear and rotational axes.
3-axis milling moves the cutter in X, Y and Z — sufficient for the majority of prismatic features: flat surfaces, pockets, slots and drilled holes. It is the most cost-effective approach for parts where all features are accessible from one face or a small number of setups.
5-axis simultaneous milling adds two rotational axes (A and B, or A and C), letting the spindle approach the workpiece from virtually any angle in a single clamping. This eliminates repositioning errors and is essential for compound-curve aerospace surfaces, medical bone plates, and turbomachinery components. Learn more on our dedicated 5-axis page.
Choose 3-axis for flat or simply stepped geometry. Choose 4- or 5-axis when your part has compound angles, undercuts, or when you need to minimize setups to hit tight positional tolerances across multiple faces.
CNCフライス加工の種類
3軸・4軸・5軸CNCフライス加工センターを運用しています。適切な選択は部品形状、ロットサイズ、必要公差によります。
3軸フライス
The workhorse of CNC milling. Three linear axes (X, Y, Z) handle the vast majority of prismatic parts — housings, brackets, plates, and blocks with flat or gently contoured surfaces.
- Standard tolerance ±0.01mm
- Flat & contoured surfaces
- Pockets, slots & through-holes
- Max part 600 × 400 × 300 mm
Ideal for: brackets, enclosures, plates, jigs and fixtures
4軸フライス
A rotary A-axis added to 3-axis movement. Parts can be indexed or continuously rotated during cutting, eliminating secondary setups for features around a cylindrical or complex profile.
- Rotational features in one setup
- Complex profiles & cams
- Reduced fixturing cost
- Excellent for shaft-style parts
Ideal for: cams, impeller blanks, manifolds with radial features
5軸フライス
Simultaneous 5-axis movement lets the cutter approach from any direction. Complex compound curves, undercuts, and tight cavities are cut in a single setup — reducing errors and cycle time.
- Achievable tolerance ±0.001mm
- Aerospace & medical geometry
- Single-setup complex parts
- Undercuts & compound curves
Ideal for: turbine blades, medical implants, aerospace structural parts
詳細を見る仕様比較
3軸・5軸フライス加工サービスのクイックリファレンス仕様。
| 仕様 | 3軸 | 5軸 |
|---|---|---|
| 標準公差 | ±0.01 mm | ±0.005 mm |
| 高精度 | ±0.005 mm | ±0.001 mm |
| 最大ワークサイズ | 600 × 400 × 300 mm | 500 × 400 × 250 mm |
| 最小フィーチャ | 0.5 mm | 0.3 mm |
| 最小肉厚 | 0.5 mm | 0.4 mm |
| 最大深さ:幅 | 4:1 | 6:1 |
| 表面粗さRa | 0.8 μm std | 0.4 μm std |
達成可能な公差は材料、部品形状および特徴サイズによります。重要寸法のDFMレビューはお問い合わせください。
加工材料
50種類以上の金属・エンジニアリングプラスチックを在庫・加工しています。一般的なCNCフライス加工材料：
表面仕上げ
すべての表面処理を社内で提供しています。
切削仕上げ
Ra 1.6–3.2 μm direct off the machine. Clean, functional surfaces with visible tool marks.
陽極酸化（タイプII・III）
Electrochemical oxide layer on aluminum. Type II decorative; Type III hard for wear resistance.
硬質陽極酸化
Type III anodizing to 25–125 μm. Excellent hardness (60–70 HRC equivalent) and dielectric properties.
ビーズブラスト
Uniform matte texture, Ra 0.8–2.0 μm. Removes machining marks and improves aesthetics.
粉体塗装
Durable polymer finish in any RAL/Pantone color. Impact and corrosion resistant.
電解研磨
Electrochemical surface smoothing. Reduces Ra by 50%, ideal for stainless steel medical parts.
ニッケルメッキ
Electroless or electrolytic nickel. Corrosion resistance, solderability, or as undercoat for chrome.
レーザー刻印
Permanent part marking — serial numbers, logos, QR codes. No mask or ink required.
CNCフライス加工の設計ガイドライン
このガイドラインに従うことで、正確な見積りを得て設計変更コストを避け、部品の製造可能性を確保できます。
- Minimum wall thickness 0.5 mm for metals, 1.0 mm for plastics — thinner walls vibrate during cutting and can deflect.
- Inside corner radius ≥ 1/3 of cavity depth — end mill diameter must fit the corner radius; design accordingly.
- Avoid deep narrow slots (depth > 6× width) — tool deflection and chip evacuation become critical beyond this ratio.
- Specify surface finish Ra only where functionally required — unnecessary finishing callouts add cost and lead time.
- Add draft to vertical walls only if needed for function — draft is for molding, not machining; omit unless necessary.
- Provide a 2D drawing for GD&T callouts and tight tolerances — model alone cannot convey datum references or geometric tolerances.
対応業界
CNCフライス加工能力は6業界の要求の高い用途に対応しています。
部品の加工をご依頼ですか？
CADファイルをアップロードして24時間以内に詳細なCNCフライス見積りを取得。最小注文数量なし。
Need turning too? If your part has both milled features (pockets, flats, cross-holes) AND a turned diameter or threaded shaft, run it through our combined milling-and-turning shop instead — one quote, one setup, tighter inter-feature tolerance.
See CNC Milling + Turning Services
