Customer Background and Requirements
In the machining industry, high-speed steel broaches are essential tools for precision hole machining. However, during use, broaches inevitably suffer from issues such as dull edges and surface roughness, which directly affect machining accuracy and product quality. The customer urgently required a specialised super-hard grinding wheel to regrind and sharpen the broaches, thereby restoring their cutting performance.
Core Customer Requirements:
The cutting edge must be as sharp as new after regrinding
Surface roughness must meet precision machining requirements
The grinding wheel must be durable to reduce replacement frequency
High cost-effectiveness to control production costs
Analysis of High-Speed Steel Material Properties
High-speed steel (HSS) is a premium material specifically used for manufacturing various steel cutting tools, possessing the following characteristics:
High-temperature resistance: Maintains high-speed cutting capability even under elevated temperatures
High wear resistance: Retains dimensional stability during prolonged use
High strength: Possesses sufficient strength and hardness
Good toughness: Combines appropriate plasticity and toughness, making it resistant to brittle fracture
It is precisely due to the high hardness of high-speed steel that the use of super-hard grinding wheels offers advantages over standard grinding wheels during regrinding.
Solution: Resin-bonded CBN grinding wheels
CBN (cubic boron nitride) is an abrasive specifically designed for grinding various iron-based steels. With a hardness second only to diamond, it is the ideal choice for grinding steel cutting tools. In response to customer requirements, we have adopted resin-bonded CBN grinding wheels, a solution offering the following advantages:
Characteristic Advantage
CBN super-hard abrasive ： Specifically designed for iron-based materials, high grinding efficiency, no clogging
Resin bond： Strong self-sharpening properties, high surface finish, excellent heat dissipation
80-grit ： A balance between coarse and fine, ensuring both regrinding efficiency and surface quality
Dynamic and static balancing tests ： Ensures smooth wheel operation and reduces vibration
Customised Design： Wheel parameters precisely matched to broach specifications
Technical Specifications of the Grinding Wheel
Outer Diameter: 40 mm
Inner Diameter: 10 mm
Thickness: 1.8 mm
Abrasive: CBN
Bond: Resin
Grit Size: 80 mesh
Balance Grade: Passed dynamic and static balance testing
Practical Application Results
Initial Prototype Validation
The customer conducted rigorous testing on the three grinding wheels from the initial prototype batch, with satisfactory results:
✅ Regrinding Quality: Cutting edges restored to sharpness, with no chipping or burn marks
✅ Surface Finish: Fully meets the surface quality requirements for precision draw tools
✅ Cutting Performance: The cutting capacity of the regrinded draw tools was restored to new-product levels
✅ Grinding wheel durability: Minimal wear per dressing cycle, resulting in a long service life
Feedback from mass production
Following validation in actual production, we have met the customer’s requirements for the surface quality of dressed broaches to near-perfect standards at a reasonable cost. The customer ultimately placed a bulk order to demonstrate their approval of our product.
Why choose resin-bonded CBN grinding wheels for dressing high-speed steel broaches?
1. Optimal material compatibility
CBN abrasives are specifically designed for iron-based materials and are chemically compatible with high-speed steel. Unlike diamond, they do not react chemically with iron elements, ensuring high and stable grinding efficiency.
2. Strong self-sharpening properties, reducing the need for wheel dressing
The resin bond possesses excellent self-sharpening properties. During the grinding process, dulled grains automatically shed, exposing new, sharp grains, which significantly reduces the frequency of wheel dressing.
3. Excellent surface quality
Resin-bonded grinding wheels produce surfaces with low roughness and smooth, burr-free edges, meeting the quality requirements for precision cutting tools.
4. Low processing costs
Although the unit price of super-hard grinding wheels is higher than that of ordinary grinding wheels, their long service life, high efficiency and superior quality result in lower overall costs.
Applications
The resin-bonded CBN grinding wheel solution for regrinding high-speed steel reamers is suitable for the following sectors:
Automotive manufacturing: Regrinding of engine block reamers
Aerospace: Maintenance of reamers for precision hole machining
Mould manufacturing: Edge repair of mould cavity reamers
General machinery: Regular regrinding and sharpening of various reamers
Technical Recommendations
To achieve optimal regrinding results, we recommend:
Selecting the appropriate grit size: 60–80 grit for rough grinding, 100–120 grit for fine grinding
Control grinding parameters: Use appropriate feed rates and grinding speeds to avoid overloading
Regularly dress the grinding wheel: Maintain the wheel’s sharpness to extend its service life
Use coolant: Ensure effective heat dissipation and improve surface quality
Get your customised solution now！
If you are facing challenges with the regrinding of high-speed steel broaches, or require grinding solutions for other precision cutting tools, please contact us immediately:
