What is Stock Removal?

Description

Stock removal is a manufacturing method where the blade shape is ground or cut from flat steel sheet rather than forged. CNC laser cutting or die stamping creates the blank, and grinding removes material to form the blade profile. Most mass-produced scissors use this approach.

What is Stock Removal?

Stock removal is a scissor manufacturing method where the blade profile is cut or ground from flat steel sheet or plate, rather than being shaped by forging. The process starts with a flat blank — produced by laser cutting, water jet cutting, or die stamping — and progressively grinds away material until the desired blade geometry is achieved.

Why It Matters for Scissors

Stock removal is the dominant manufacturing method for scissors worldwide, accounting for an estimated 80-90% of global production. It is faster, cheaper, and more easily automated than forging. A CNC laser cutter can produce hundreds of precise blanks per hour from flat sheet, compared to the minutes-per-piece rate of forging.

The key limitation is that stock removal does not improve the steel’s grain structure. The blank retains whatever microstructure the sheet had from the steel mill — typically a rolled grain pattern running in one direction. The grain is cut abruptly at the blank edges rather than flowing along the blade contour. This means the steel’s performance depends entirely on the quality of the starting material and the subsequent heat treatment.

Modern stock-removal scissors compensate through excellent heat treatment. Manufacturers like Joewell and many Seki City producers use precision vacuum heat treatment to achieve consistent hardness of HRC 58-62 even in stamped blanks. CNC grinding then shapes the blade to tolerances of 0.01-0.02mm, producing scissors that perform very well in professional use.

The cost advantage is significant: stock-removal blanks cost roughly 40-60% less to produce than forged blanks of equivalent size, which allows manufacturers to invest more in heat treatment, grinding, and finishing while maintaining competitive pricing.

Technical Detail
The stock-removal process for scissors follows a well-defined sequence: 1. **Blank cutting** — flat sheet steel (typically 2-4mm thick) is cut into rough blade shapes. Methods include: - **CNC laser cutting** — highest precision (±0.1mm), minimal heat-affected zone with fibre lasers, increasingly the standard method - **Water jet cutting** — no heat-affected zone, good for heat-sensitive steels, but slower and higher operating cost - **Die stamping/punching** — fastest and cheapest for high volumes, but requires expensive tooling and produces less precise blanks - **Wire EDM** — extremely precise but very slow, used only for prototyping or very small runs 2. **Rough grinding** — the blank is ground to approximate blade thickness and profile using coarse abrasive belts or wheels (60-120 grit) 3. **Heat treatment** — the ground blank is hardened, typically through austenitizing at 1,050-1,080°C (for VG-10), quenching, optional cryogenic treatment, and tempering 4. **Finish grinding** — CNC surface grinders and cylindrical grinders bring the blade to final dimensions. This is where the ride line, edge bevel, and any hollow grinding (including ura-suki) are established 5. **Hand finishing** — in premium stock-removal scissors, skilled workers refine the edge and adjust blade geometry The grain structure difference between stock-removal and forged blanks is measurable but sometimes overstated. Modern steel sheet from mills like Takefu Special Steel or Proterial is produced with controlled rolling and annealing that yields reasonably fine, uniform grain — typically ASTM grain size 6-8. Forging refines this further to 7-9, a meaningful but not dramatic improvement. Where stock removal is most disadvantaged is at stress concentration points. The pivot hole, for instance, is simply drilled or punched through the sheet, cutting grain abruptly. In a forged blank, grain flows around the pivot area. Under cyclic loading (thousands of opening-closing cycles per day in professional use), the forged grain pattern resists fatigue cracking more effectively. Some manufacturers use a hybrid approach — stamping the rough blank for speed, then locally forging or upsetting the pivot area for improved grain flow where it matters most. This compromise captures some forging benefits while maintaining most of the cost advantage of stock removal.

Sources

Frequently Asked Questions

Not necessarily. The quality of a stock-removal scissor depends heavily on the steel grade, heat treatment, and finishing. A well-made stock-removal scissor from quality steel with proper heat treatment will outperform a poorly forged scissor. However, forging does provide grain refinement benefits that stock removal cannot replicate.

Most scissors under $200 retail are stock-removal. Some manufacturers disclose the process, but many do not. The absence of any mention of forging in marketing materials is a reasonable indicator. Extremely thin, uniform blade cross-sections are also characteristic of stock-removal production.

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