Overview
36A Turning is a standardized grade of tungsten carbide turning inserts, classified under ISO application code 'M' for general-purpose machining of steel, cast iron, and high-temperature alloys. Developed for industrial lathes and CNC turning centers, it balances toughness and wear resistance, making it suitable for both interrupted cuts and continuous operations. The designation '36A' reflects its optimized composition (typically 6–10% cobalt binder) and micro-grain carbide structure, which enhances thermal stability. It is commonly available in rhombic, triangular, or round shapes with chipbreaker geometries to improve swarf control.
Structure and Working Principle
The insert consists of a sintered tungsten carbide body with a cobalt matrix, often coated with thin layers of titanium carbide (TiC) or aluminum oxide (Al₂O₃) to reduce crater wear. The cutting edge is ground to precise angles (e.g., 80° diamond shape) to minimize vibration and maximize surface finish. During operation, the insert is clamped onto a tool holder, which positions it at the optimal rake angle for shear deformation of the workpiece material. The hardness of tungsten carbide (HRA 90–93) allows it to withstand temperatures up to 1,000°C without significant softening.
Key Features
36A inserts excel in high-speed machining (200–400 m/min for steel) due to their thermal shock resistance and anti-diffusion coatings. Their multi-layer coatings reduce friction and prevent built-up edge formation, critical for maintaining dimensional accuracy. Another advantage is versatility: the same grade can handle both roughing (deep cuts with lower speeds) and finishing (shallow cuts with high speeds) by adjusting feed rates. This reduces tool inventory costs for manufacturers.
Application Areas
Primary applications include automotive component machining (crankshafts, gears), aerospace part turning (turbine discs), and general engineering (hydraulic cylinders, shafts). The grade is particularly effective for ductile materials like stainless steel 304 or hardened alloy steels up to HRC 45. In foundries, 36A inserts are used for machining cast iron with sand inclusions, where edge chipping resistance is crucial. Some variants with polished flutes are optimized for aluminum turning to prevent material adhesion.
Maintenance and Precautions
To extend tool life, avoid dry machining when possible; water-soluble coolants or minimum quantity lubrication (MQL) systems are recommended. Inspect edges regularly for flank wear (>0.3 mm indicates replacement) and rotate inserts to distribute wear evenly. Storage should be in low-humidity environments to prevent oxidation of the cobalt binder. Use torque-limiting toolholders to prevent over-clamping, which can cause microfractures in the carbide substrate.
B2B Procurement Guide
When sourcing 36A Turning inserts, verify ISO 1832 standards compliance and coating specifications (e.g., CVD or PVD). Bulk purchases (50+ pieces) typically reduce unit costs by 15–20%. Leading manufacturers include Sandvik Coromant, Kennametal, and Iscar. For custom requirements, provide details like workpiece material hardness, machine power, and desired surface finish (Ra value). Some suppliers offer trial inserts for performance testing. Price varies based on coating technology and order volume, with premium brands commanding a 25–30% cost premium over generic alternatives.
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