Small Diameter Boring Tools are specialized cutting tools designed for machining small-diameter holes with high precision and superior surface finish. They are widely used in industries where extreme dimensional accuracy and surface quality are required, such as aerospace, medical devices, and electronics. These tools are essential for machining micro-holes, deep holes, and complex-shaped holes in high-tech applications.

1. Structure and Components

Small diameter boring tools typically consist of the following key components:

• Tool Shank: The shank is the main body of the tool, usually made from high-strength alloy steel or carbide to ensure sufficient rigidity and vibration resistance during high-speed cutting. The shank diameter is small, making it suitable for machining small holes.

• Tool Head: The tool head is the part that directly engages in cutting and is often equipped with replaceable inserts. The inserts are typically made from carbide, ceramic, or cubic boron nitride (CBN) to accommodate different materials and cutting conditions.

• Micro-Adjustment Mechanism: Small diameter boring tools often feature precise micro-adjustment mechanisms for adjusting the tool diameter to achieve micron-level accuracy. These mechanisms can be mechanical, hydraulic, or electronic.

• Coolant Channels: Many small diameter boring tools are designed with internal coolant channels that deliver coolant directly to the cutting zone, effectively reducing cutting temperatures, minimizing tool wear, and improving surface finish.

2. Features and Advantages

• High Precision: Small diameter boring tools can achieve extremely high dimensional and geometric accuracy, often meeting IT5 or higher precision grades.

• Superior Surface Finish: Due to the rigidity and stability of the tool, small diameter boring tools can produce holes with very low surface roughness, typically achieving Ra values below 0.8μm.

• Versatility: These tools can machine a wide range of materials, including steel, cast iron, aluminum alloys, titanium alloys, and high-temperature alloys.

• Efficient Machining: By optimizing tool geometry and cutting parameters, small diameter boring tools can maintain stability under high-speed cutting conditions, significantly improving machining efficiency.

3. Applications

• Aerospace: Used for machining small and deep holes in critical components such as engine blades, combustion chambers, and turbine disks.

• Medical Devices: Used for machining micro-holes in surgical instruments, implants, and other precision medical components.

• Electronics: Used for machining high-precision components in semiconductor equipment and optical devices.

• Mold Making: Used for machining small and complex-shaped holes in injection molds and die-casting molds.

4. Selection and Usage Considerations

• Tool Material Selection: Choose the appropriate insert material based on the hardness, toughness, and other properties of the workpiece material.

• Cutting Parameter Optimization: Select appropriate cutting speed, feed rate, and depth of cut to extend tool life and ensure machining quality.

• Coolant Usage: Ensure adequate coolant flow and pressure to effectively reduce cutting temperatures and remove chips.

Small diameter boring tools are indispensable in industries where precision and efficiency are critical, ensuring that even the most challenging machining tasks are completed to the highest standards.