Main Applications

The catalog presents 109 items of the ZPB-TH series plunge boring drills designed for various boring operations including guide hole boring on sloped surfaces (up to 30°), chamfering, edge plunge boring, thin plate boring, hole correction, and boring on convex surfaces.

Product Specifications and Notices

Specifications may change without notice due to product improvements. The catalog is printed with environmentally friendly soybean ink. Contact details for Hitachi Tool’s headquarters and overseas offices (Europe, China, USA, Thailand, India) are provided for technical support and sales inquiries.

Safety Instructions

Handling Precautions

• Carefully remove tools from packaging to avoid dropping or sudden ejection, especially avoiding contact with sharp cutting edges.
• Do not touch cutting edges with bare hands to prevent injury.

Mounting Precautions

• Inspect tools for damage such as scratches or cracks before use.
• Ensure secure mounting in collet chucks or equivalent holders.
• Stop the machine immediately if abnormal vibrations or chatter occur and resolve the issue before continuing.

Usage Precautions

• Verify tool dimensions, rotation direction, and workpiece material before use.
• Start with recommended standard cutting conditions and adjust based on cutting depth, machine rigidity, and material properties.
• Wear safety goggles and use safety covers to protect against flying chips and tool breakage.
• Avoid use in environments with fire or explosion risk due to sparks or heat generated during cutting.
• Use tools only for their intended purposes.

Regrinding Precautions

• Perform timely regrinding to prevent tool breakage; replace tools if necessary.
• Use safety covers and protective gear during regrinding to protect from dust and debris.

Cutting Conditions

Cutting parameters are specified for various work materials categorized by hardness: structural steel (up to 180 HB), carbon steel (up to 200 HB), alloy steel (up to 30 HRC), pre-hardened steel (up to 45 HRC), aluminum alloys, aluminum castings, and cast iron.

Parameters include cutting speed (vc), spindle speed (n), and feed rate (f) for different drill diameters. Adjustments should be made based on machine rigidity, clamping, and workpiece shape.

• Horizontal feed machining is not possible with these tools.
• Not suitable for stainless steel machining (e.g., SUS304, SUS316).
• Use appropriate cutting fluids with sufficient application.
• If chips cannot be broken, perform step machining.
• Recommended hole depth: up to 2 times drill diameter (2Dc) for diameters ≤6 mm; up to 1.5 times for diameters >6 mm.
• For sloped surfaces, reduce feed rate to 70-80% for slopes ≤30°, and less than 50% for slopes >30°.

Tool Lineup and Dimensions

The catalog details 109 items with drill diameters ranging from 2.0 mm to 26 mm. Specifications include flute length (R), shank diameter (Ds), and overall length (L). Stock availability is indicated: ● for standard stocked items and □ for items stocked by specific distributors (contact sales).

Product Features and Performance Data

The "Zaguri Borer" features a 180° flat tip angle enabling plunge boring on flat and sloped surfaces. Its special flute design reduces breakage and chipping, ensuring stable machining. The unique groove shape facilitates smooth chip evacuation, preventing chip-related issues.

Performance data includes cutting conditions for vertical and horizontal machining centers under dry conditions, showing spindle speeds, feed rates, and coolant usage. Comparative tests demonstrate reduced hole position shift (±0.15 mm) on 30° slopes and superior tool life (up to 4200 holes on SCM440 steel at 30 HRC) compared to competitor drills and end mills. Cutting resistance data shows lower cutting forces and moments, indicating better cutting efficiency.

Additional Services

Drill regrinding and recoating services are available. Customers are encouraged to contact sales departments for details.

Summary Tables and Data Highlights

• Hole Position Shift Table: Demonstrates high precision with minimal positional deviation during plunge boring on sloped surfaces.
• Tool Life Graphs: Show ZPB drills outperform competitors in durability under identical conditions.
• Cutting Force Data: Indicates efficient cutting mechanics with higher feed force but lower moment compared to competitors.
• Cutting Conditions Table: Provides detailed rpm and feed recommendations per material and drill diameter, including slope machining adjustments.

Critical Notes and Best Practices

• Do not perform horizontal feed machining with these drills.
• Adjust cutting parameters based on machine rigidity, workpiece clamping, and machining surface angle.
• Ensure sufficient coolant application appropriate to the work material.
• Always use safety equipment and covers to mitigate risks from flying debris and tool breakage.