Durable Multi-stone Honing Mandrels for High Efficiency Bore Finishing
Product Description
Multi-stone honing tools are advanced internal bore finishing tools designed for high-precision, high-efficiency applications across a wide range of industries. Suitable for bore diameters ranging from 16 mm to 200mm, these tools incorporate multiple abrasive stones arranged evenly around the circumference. The honing stones are radially expanded by an internal cone mechanism, applying uniform pressure to the bore wall and achieving superior surface finish and dimensional accuracy.
Compared to traditional single-stone honing mandrels, multi-stone tools offer significantly higher stock removal rates, improved roundness and cylindricity, and shorter cycle times. These advantages make them ideal for high-volume production environments where performance, reliability, and consistency are critical.
Tool Configurations and Operating Principles
Multi-stone honing tools are available in two primary configurations:
• Single-Stage Tools - Standard design for consistent expansion and efficient material removal in one pass.
• Double-Expansion Tools - Feature separate roughing and finishing stone sets, allowing roughing and plateau honing to be completed in a single operation. This is especially useful for applications requiring precise functional surface structures, such as plateau honing in engine blocks or hydraulic components.
The expansion system uses a mechanical or hydraulic cone to push the stones outward, ensuring uniform abrasive contact across the bore. The robust construction and balanced design allow for high-speed, stable operation with minimal vibration.
Abrasive Compatibility and Material Versatility
These honing tools are specifically designed to be used with metal bond superabrasives, including CBN (Cubic Boron Nitride) and diamond, making them suitable for a broad spectrum of difficult-to-machine and wear-resistant materials.
Typical materials that can be processed include:
• Aluminum & alloys
• Hard chromium coatings
• NiKaSil
• Gray cast iron (e.g., G26Cr, GGG40)
• Tool steels and hardened steels (e.g., 16MnCr5, 34CrNiMo6, 42CrMo4V, ST52, 9SMn28k, C45, 17CrNiMo6, VA steel)
• Oxide and thermal coatings (APS, LDS, RSW, CBC, FeC, PTWA)
• Graphite, CFC, titanium-aluminum alloys, and other specialty or coated materials
This flexibility makes the multi-stone system applicable to a wide range of high-value components, including:
• Automotive engine blocks
• Hydraulic cylinders and valve bodies
• Fuel injection components
• Aircraft actuators and struts
• Medical and precision mechanical parts
Performance Benefits
• Exceptional Dimensional Control: Achieve bore tolerances in the micron range, even on long or interrupted bores.
• Superior Surface Finishes: Ra values below 0.15 μm with plateau honing capability.
• High Material Removal Rate: Especially effective in roughing and finishing hardened or coated surfaces.
• Extended Tool Life: CBN and diamond abrasives ensure consistent performance over thousands of cycles.
• Reduced Cycle Time: Double-expansion heads combine two operations into one, increasing throughput.
• Stable and Durable Construction: Designed for continuous operation in demanding industrial environments.
Product Parameters
| Diameter range |
Honing Stone Length |
Abrasive Grit |
| 16 ~ 19mm |
30, 35, 40, 45, 50, 60 |
80/100, 200/230, 325/400, 600 |
| 19 ~ 21mm |
40, 45, 50, 60, 80 |
80/100, 200/230, 325/400, 600 |
| 21 ~ 24mm |
40, 45, 50, 60, 80 |
80/100, 200/230, 325/400, 600 |
| 24 ~ 26mm |
60, 80, 90, 100 |
80/100, 200/230, 325/400, 600 |
| 26 ~ 30mm |
60, 80, 90, 100 |
80/100, 200/230, 325/400, 600 |
| 30 ~ 34mm |
60, 80, 90, 100 |
80/100, 200/230, 325/400, 600 |
| 34 ~ 38mm |
60, 80, 90, 100 |
80/100, 200/230, 325/400, 600 |
| 38 ~ 42mm |
60, 80, 90, 100 |
80/100, 200/230, 325/400, 600 |
| 42 ~ 46mm |
60, 80, 90, 100 |
80/100, 200/230, 325/400, 600 |
| 46 ~ 50mm |
60, 80, 90, 100 |
80/100, 200/230, 325/400, 600 |
Detailed Photos
Multi-stone honing tools for both vertical and horizontal honing machines.
With over 20 years of experience in the research, development, production, and sales of honing tools, BOSON not only manufactures honing tools and machines but also provides professional honing services. Leveraging world-class diamond and CBN abrasives, diversified bond systems, mature manufacturing processes, and extensive application knowledge, our honing stones deliver high-efficiency material removal and consistently achieve excellent surface finishes across a wide range of materials.
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