Aoshiji® Custom Tool – PCD Finishing Reamer with Chipbreaker Teeth for High-Precision Boring Applications
01 Introduction
New energy vehicles (NEVs) rely heavily on stable thermal management systems, and the water pump plays a critical role in maintaining efficient cooling for motors, power electronics, and battery packs. Most NEV water pumps use a high-speed motor-driven impeller to generate centrifugal force, creating a low-pressure zone at the center while pushing coolant toward the outlet to achieve continuous circulation.
Because pump performance is directly affected by motor speed and coolant flow stability, manufacturers place strict requirements on the dimensional accuracy and surface finish of key components—especially the bearing bore. This is where Aoshiji® Custom Tool’s PCD Finishing Reamer with Chipbreaker Teeth for High-Precision Boring delivers the precision, consistency, and stability required for reliable NEV water pump operation.
PCD REAMER:
SOLID CARBIDE REAMERS :
BRAZED CARBIDE REAMERS :
02 Component Specifications and Customer Requirements
Workpiece: Water Pump
Material: AlSi9Cu3
Machine Tool: Vertical Machining Center
Coolant Method: Internal Coolant
Machining Area: Bearing Bore
Component Drawing:
03 Machining Challenges
Due to the small bore diameter (∅20.04 mm), an indexable boring unit cannot be applied; therefore, an integral tool must be used for machining.
The bore tolerance is extremely tight, limited to just 0.03 mm, while additional requirements include concentricity of 0.05 mm, cylindricity of 0.015 mm, and a specified R-radius structure at the bottom of the hole.
In addition to the strict tolerance of ∅20.04 mm, the bore surface roughness must be controlled between Rz8–Rz10. Such combined requirements are difficult to achieve with conventional tools.
04 Optimized Tooling Solution with PCD Finishing Reamer with Chipbreaker Teeth
Design Features:
To meet the bore wall roughness requirement (Rz8–Rz10), the reamer incorporates a chipbreaker tooth design with precision micro-adjustment, effectively controlling the cutting state and ensuring excellent surface finish quality.
Considering the tight bore tolerance and high roundness requirement, the reamer’s chipbreaker geometry helps distribute cutting forces, reduce machining errors, and guarantee stable bore dimensions and shape accuracy.
Compared with the customer’s trial solution using a single-edge boring tool, this reamer leverages multi-tooth coordination combined with chipbreaker design, significantly improving cutting efficiency while maintaining superior machining quality.
05 Final Machining Parameters Delivered to the Customer
Tool Diameter: D20.04 mm
Spindle Speed: S2000 rpm
Feed Rate: F900 mm/min
In conclusion, the PCD finishing reamer with chipbreaker teeth developed by Aoshiji® Custom Tool has proven to be an innovative solution that directly addresses customer challenges in high-precision boring applications. By integrating chipbreaker geometry into the reaming process, our design not only improves chip evacuation and cutting stability but also significantly enhances surface quality and tool life.
As demonstrated in our previous article “Taper Drill with Chipbreaker Grooves – 3× Longer Tool Life for Steering Knuckle Machining | Aoshiji® Custom Tool”, we continue to apply advanced methods to deliver measurable benefits for our customers. In practice, our new reamer products have already solved critical machining issues, with optimized cutting parameters that provide both reliability and repeatability on the shop floor.
To further support complex reaming operations, our product portfolio also includes the 6-Flute 2-Step PCD Reamer with Shank – High-Precision Multi-Diameter Reaming and the 4-Flute PCD Step Reamer with Shank – High-Accuracy Multi-Diameter Finishing, offering versatile solutions for multi-diameter and high-accuracy applications.
Just as leaders like Sandvik Coromant and MAPAL continue to drive innovations in precision reaming, Aoshiji® Custom Tool remains committed to delivering professional, high-efficiency, and problem-solving cutting tool solutions that empower manufacturers worldwide.
By choosing Aoshiji® Custom Tool’s PCD finishing reamers with chipbreaker teeth, customers gain more than just a tool—they gain a proven method to stabilize their machining processes, improve productivity, and achieve superior results in high-precision boring.
Related Technical Insight
Get a practical, geometry-based view of chip control: how straight, arc, and straight–arc chipbreakers influence chip curl radius, cutting forces, surface finish, and tool wear.
Read: Tech Insights | The Impact of Chipbreaker Geometry on Cutting Performance – What You Need to Know
