Slicing Magnetic Materials with Endless Diamond Wire Saw

Test scope: Precision straight slicing of a cylindrical magnetic-material sample supplied by a European customer, using an Ensoll ESO-GM endless diamond wire saw.

Magnetic materials are hard and brittle, with relatively low fracture toughness. During slicing, cutting force, frictional heat, and internal stress can cause edge chipping, microcracks, thickness variation, and surface damage. This test evaluated whether an endless diamond wire process could maintain stable slice geometry and surface integrity while cutting a 15 mm diameter sample.

Where the workpiece is NdFeB rather than ferrite, the settings in our how to cut neodymium magnets guide are the safer starting point.

Measured Results at a Glance

• Workpiece: Magnetic material, approximately Mohs 6-7
• Sample dimensions: 15 mm diameter x 103 mm length
• Nominal slice thickness: 3.780 ミリメートル
• TTV: 0.008-0.011 mm across five slices; average 0.009 ミリメートル
• Average surface roughness (Ra): 0.71-0.88 micrometers
• Maximum measured edge chipping: 6.7-9.2 micrometers by slice

結果は、各個別スライス内で良好な厚さの均一性と、一貫して低い表面粗さを示しています。. 5枚のスライスにわたる平均厚さの徐々の変化は、重要なプロセス制御の機会も示しています。: スライス複数枚のバッチ間のより厳密な一貫性を確保するには、生産中にオフセットまたは送り補正が必要です。.

1. 試験目的とプロセス戦略

顧客は、厚さの変動が制御され、精密な直線スライスを求めました。, 表面粗さ, およびエッジ損傷. エンソルは、 ESO-GM 無限ダイヤモンドワイヤソー, 切削油、, および完全にコーティングされたダイヤモンドワイヤループを、適合するプロセスシステムとして選定しました。.

切削油は、切削領域での潤滑と熱除去を改善するために使用されました。. 完全にコーティングされたワイヤは、安定した研磨剤分布と一貫した材料除去を提供します。, while the machine’s tension-control system helps reduce wire-position fluctuation during the cut.

2. Equipment and Cutting Parameters

The ESO-GM uses a rigid gantry structure with top-down vertical feed. Its integral cast-iron frame is designed to limit vibration and structural deformation during long cutting cycles. The system also includes real-time tension control, wire-break position memory, and mist extraction for oil-cooled processing.

Customers evaluating similar hard and brittle components can also review Ensoll’s magnetic-material cutting machines そして ダイヤモンドワイヤーループ.

3. 総厚変化 (TTV)

Each slice was measured at nine positions using a vacuum-chuck, dual-probe thickness measurement method. The TTV value is the difference between the maximum and minimum measured thickness on the same slice.

Interpretation: TTV remained between 0.008 そして 0.011 ミリメートル, with an average of 0.009 ミリメートル. This indicates stable local thickness uniformity within each slice.

4. Average Thickness and Dimensional Drift

The nominal slice thickness was 3.780 ミリメートル. Average thickness was calculated from the nine measurements for each sample.

Interpretation: The observed deviations ranged from -0.083 宛先 +0.009 ミリメートル. Although the within-slice TTV remained stable, the average thickness decreased over the sequence. For applications with a tight batch-level thickness tolerance, this trend should be addressed through programmed thickness-offset compensation, feed adjustment, or wire-bow compensation.

5. Surface Roughness

Surface roughness was measured with a stylus profilometer at three representative positions on each cut surface, following the Ra definition in ISO 4287.

Interpretation: Average Ra remained within 0.71-0.88 micrometers. The narrow range indicates a stable abrasive cutting state and a consistent surface suitable for subsequent precision finishing.

6. Edge-Chipping Results

Edge chipping was measured at four positions on each slice using an optical tool microscope.

Interpretation: The largest measured chip was 9.2 micrometers, and the average of the five maximum values was 7.7 micrometers. The edges remained visually intact with limited brittle-fracture damage.

7. Engineering Conclusion

This test demonstrates that the ESO-GM endless diamond wire process can produce magnetic-material slices with low within-slice TTV, consistent sub-micrometer Ra values, and limited edge chipping. The combination of a rigid machine structure, real-time tension control, a fully coated diamond wire loop, and oil cooling supported a stable cutting condition.

The data should also be read carefully: TTV describes uniformity within each slice, while the average thickness values show a downward trend across the five-slice sequence. Before volume production, the process should therefore be validated against the customer’s drawing tolerance and, where necessary, supplemented with automatic thickness or wire-bow compensation.

For a different magnetic-material machining requirement, see Ensoll’s irregular-profile magnetic-material cutting test.

Citation permission: If you find this article helpful, Ensoll authorizes you to quote or reference it, provided that you include a link to this page as the original source.

よくある質問

What is TTV in precision slicing and why does it matter?

TTV (total thickness variation) is the difference between the thickest and thinnest points on one slice. Low TTV means uniform slices, which reduces downstream lapping and keeps magnetic component tolerances tight. This test held TTV between 0.008 そして 0.011 ミリメートル.

Why does slice thickness drift during multi-slice production?

As cutting progresses, wire wear and wire bow slowly change the effective cut position, so later slices can come out thinner or thicker. The fix is programmed thickness-offset compensation, feed adjustment, or wire-bow compensation before volume production.

What level of edge chipping is acceptable when slicing hard, brittle magnets?

It depends on the drawing, but single-digit micrometers is considered clean. In this test the largest measured chip was 9.2 micrometers and edges remained visually intact with limited brittle-fracture damage.

Why use cutting oil when slicing magnetic materials?

Cutting oil improves lubrication and heat removal in the cutting zone and helps evacuate swarf, which keeps the wire cutting stable and the workpiece cool throughout long slicing cycles.

Technical content reviewed by the Ensoll engineering team — a diamond wire loop manufacturer with 10+ years of production experience.