Tech Insights | Three Methods for Machining Superhard Cutting Tools – Advantages of Laser Processing in PCD Tool Manufacturing Featuring PCD Keyseat Cutter with Shank | Aoshiji® Custom Tool
Three Methods for Machining Superhard Cutting Tools
Machining superhard cutting tools such as PCD and PCBN requires dedicated processes that balance precision, productivity, and cost.
1. Grinding
As a traditional method for machining superhard cutting tools, grinding technology plays a crucial role in precision machining. It delivers superior flank surface quality that ensures smooth cutting edges, enhanced performance, and extended tool life. For Aoshiji® Custom Tool END MILLS, grinding provides high-precision cutting edges and excellent surface finish, enabling consistent performance in demanding precision machining applications.
However, grinding also has limitations. It is primarily suited for simpler geometries such as straight lines or standard external radii, while complex tool shapes are far more difficult to process. Additionally, its relatively low productivity requires specialized grinding machines and wheel consumables, increasing both cost and equipment investment. In large-volume production, maintaining dimensional consistency is challenging, and deviations may occur, reducing overall process stability for machining superhard cutting tools at scale.
2. Electrical Discharge Machining (EDM)
EDM offers unique advantages but also comes with clear limitations. On the positive side, it can machine almost all hard conductive materials, making it highly suitable for complex geometries and micro-precision features. As no cutting forces are involved, thermal impact on the workpiece is minimal, and machining accuracy can reach micrometer levels. This makes EDM especially valuable in producing the Aoshiji® Custom Tool PCD Combination Tool – Precision Stepped Bore & Counterboring, where intricate geometries and multi-step precision are required.
However, EDM also has drawbacks: it cannot process non-conductive materials, productivity is relatively low, costs are high, and maintaining dimensional consistency in mass production remains challenging. For this reason, EDM is typically used for very complex geometries where flexibility matters more than throughput. In many applications related to machining superhard cutting tools, EDM serves as a specialized solution rather than a high-volume production method.
3. Laser Machining
Among all methods used for machining superhard cutting tools, laser processing provides the best combination of speed, precision, and repeatability, especially for PCD tooling. It delivers extremely high efficiency and easily meets large-scale production requirements. In addition, its consumable-free nature significantly reduces operating costs while minimizing downtime associated with tool changes.
A representative example is the Aoshiji® Custom Tool PCD Keyseat Cutter with Shank – Integrated Design for Precision Slotting. With laser machining, complex slot geometries and ultra-precise cutting edges can be produced in a single setup, ensuring exceptional accuracy, stability, and productivity for demanding custom slotting applications.
Our horizontal 5-axis laser grinding system adopts an advanced horizontal architecture designed for both high efficiency and precision, covering small and medium-sized 5-axis tool production. Equipped with an industrial-grade fiber laser, the system performs roughing and finishing in one clamping — from PCD blank welding and rough cutting to precise edge finishing. The platform supports coarse cutting, edge grinding, and ultra-short pulse laser processing for both diamond and CBN materials, achieving consumable-free machining with excellent energy efficiency and environmental benefits.
Equipment Advantages
Specifically designed for PCD, PCBN, and other superhard cutting tools, enabling efficient processing of complex geometries and customized tool solutions.
Capable of machining tools with a length over 400 mm and a diameter exceeding 300 mm, making it suitable for large-scale tool manufacturing.
Supports 3.2 mm-thick blanks with both roughing and finishing operations on both sides, all completed in a single clamping.
Compatible with multiple tool interfaces, providing flexible configuration and quick adaptation to diverse tooling requirements.
Features an ergonomic cantilever control panel, enhancing operator experience, reducing training time, and ensuring high efficiency in day-to-day shop-floor operations.
In conclusion, machining superhard cutting tools demands specialized methods that deliver both durability and precision across every stage of the process. By applying advanced approaches in tool geometry design, optimized grinding techniques, and ultra-hard materials such as PCD, Aoshiji® Custom Tool enables manufacturers to achieve longer tool life, consistent performance, and reduced machining costs.
Machining superhard cutting tools requires not only advanced equipment but also a well-structured process that ensures accuracy from blank preparation to final edge finishing. By integrating optimized grinding strategies, precise EDM micro-features, and high-efficiency laser processing, manufacturers can significantly improve cutting-edge quality, shorten cycle time, and achieve repeatable accuracy in mass production. This makes modern machining technologies essential for achieving stable performance and long tool life in PCD, PCBN, and other superhard cutting tools.
Building on our previous article “How Can Precision Reaming of Hydraulic Valve Blocks with Aoshiji® Custom Tool Brazed Carbide Reamers Reduce Per-Hole Cost by 70% and Increase Productivity by 10 Times?”, this discussion highlights how innovative approaches to superhard tool machining are essential to meeting the rising demands of modern manufacturing.
For precision-critical applications, our portfolio includes the PCD Form Tool for Precision Machining Applications and the advanced PCD Keyseat Cutter with Shank, both designed to deliver outstanding performance in high-hardness materials.
Just as global leaders like Sandvik Coromant and MAPAL continue to pioneer solutions for hard and superhard machining, Aoshiji® Custom Tool remains committed to providing high-efficiency, high-precision cutting tool solutions engineered for the most demanding industrial applications.
By choosing Aoshiji® Custom Tool’s PCD solutions, manufacturers gain the confidence to push machining limits, extend tool service life, and maintain a sustainable competitive edge in superhard materials processing.
