CNC加工サイクルタイム短縮方法. エンジニアリング意思決定のための完全な参照表。
完全な参照表とエンジニアリングデータ： 工具鋼熱処理. すべての値はISO、ANSI、メーカー規格に対して検証済み。
Even with high-end tooling from CERATIZIT and Mitsubishi Materials, things go wrong. Here are the most common Tool Steel Heat Treat-related issues our technical team sees, and how to fix them.
Diagnosis: Your surface speed is likely too high. Even CERATIZIT AlTiN-coated carbide can't outrun excessive heat generation. Check that your Tool Steel Heat Treat matches the actual material hardness — a shift from HRC 28 to HRC 32 4140 changes everything.
Fix: Reduce SFM by 15-20%. Verify coolant concentration with a Renishaw refractometer (target 8-10% for steel).
Diagnosis: Your Tool Steel Heat Treat might be fine for straight cuts, but corner engagement increases dramatically. Mitsubishi Materials application engineers call this the "corner trap" — the tool sees 180° of engagement in a 90° internal corner.
Fix: Add a finish pass at 0.1mm radial depth with a separate finishing tool. Program the Makino to reduce feed rate to 50% in corners.
Diagnosis: You're applying CERATIZIT Tool Steel Heat Treat values to Mitsubishi Materials tools — or vice versa. Each manufacturer's carbide substrate and coating system has a different sweet spot.
Fix: Download the specific Tool Steel Heat Treat chart for your exact tool from the manufacturer's website. CERATIZIT CoroPlus and Mitsubishi Materials NOVO both offer free digital tools.
Tool steels achieve their final properties through controlled heat treatment. Hardening and tempering temperatures vary significantly between grades. This reference covers the critical temperatures for the most commonly used tool steels in machining and toolmaking.
O1 can be heat treated with a torch and oil quench followed by kitchen-oven tempering. A2 and D2 need a heat treatment furnace with temperature control (plus/minus 5 deg C) and protective atmosphere or stainless foil wrap to prevent decarburisation. H13 and M2 require high-temperature furnaces (1200+ deg C) and multi-stage preheating -- leave these to professional heat treaters.
Tempering between 250-400 deg C on many alloy steels causes "temper embrittlement" -- a loss of toughness. This is why H13 should always be tempered above 540 deg C. The secondary hardening peak (around 500-550 deg C) in alloy tool steels actually increases hardness slightly. Each grade has specific tempering temperature ranges that should be strictly followed.
Wrap the part in stainless steel tool wrap foil (309 or 321 stainless, 0.05 mm thick) with a small piece of paper or wood inside to consume residual oxygen. Seal tightly. This creates a protective atmosphere inside the envelope. Alternatively, use a controlled-atmosphere furnace with nitrogen or endothermic gas. Decarburisation removes carbon from the surface, softening it -- this cannot be recovered without removing the decarburised layer by grinding.
Identify your tool steel grade. Look up the austenitising (hardening) temperature and quenching medium. Temper at the temperature corresponding to your target hardness. For critical tooling, use a professional heat treater with vacuum furnace capability -- the consistency and quality assurance are worth the cost.
Continue with closely related resources from the machining reference library.
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