3.5 Electroplated Bond Grinding Wheels

Electroplated grinding wheels are manufactured by bonding a single layer of abrasive grains onto a metal core through an electroplating process.

The abrasive grains have a high degree of exposure, providing excellent cutting ability and high material removal efficiency.

Advantages:

Electroplated wheels offer:

• High abrasive concentration

• Excellent geometric accuracy

• Extremely sharp cutting performance

• High cutting efficiency

• Good suitability for complex profiles

They are widely used for:

• Precision profile grinding

• Form grinding

• Internal grinding

• Special-shaped component machining

• Diamond and CBN applications

Precautions:

Single-Layer Abrasive Structure

Most electroplated wheels contain only one abrasive layer.

Therefore:

• Once the abrasive layer is worn out, the wheel usually cannot be economically re-coated.

• The complete wheel normally needs to be replaced.

Avoid Impact and Overloading

The electroplated bond is strong but relatively sensitive to mechanical damage.

Avoid:

• Heavy impact

• Excessive feed pressure

• Sudden loading

Strong impact may cause abrasive grains to detach from the plated layer.

Control Grinding Forces

Electroplated wheels generally cannot withstand excessive:

• Radial force

• Axial force

Stable grinding conditions should always be maintained to prevent premature damage.

3.6 Brazed Bond Grinding Wheels

Brazed grinding wheels use a brazing process to create a metallurgical bond between abrasive grains and the wheel substrate.

Compared with electroplated wheels, brazed wheels provide stronger abrasive retention and allow much higher grain exposure.

The abrasive exposure can reach approximately 70–80%, creating large chip pockets and excellent cutting efficiency.

Advantages:

Brazed wheels provide:

• Extremely strong abrasive retention

• High abrasive protrusion

• Excellent heat dissipation

• Large chip storage space

• High grinding efficiency under heavy loads

They are suitable for:

• High-efficiency grinding

• Heavy-duty machining

• High-speed grinding applications

• Difficult-to-machine materials

Precautions:

Avoid Excessive Impact Loads

Although brazed wheels have strong bonding strength:

Avoid:

• Sudden impact

• Excessive shock loading

• Severe vibration

These conditions may cause:

• Abrasive grain fracture

• Damage to the wheel substrate

• Brazed layer failure

Control Grinding Temperature

Temperature control is extremely important, especially for diamond brazed wheels.

At approximately 700–800°C, diamond may undergo graphitization and lose its cutting ability.

To prevent thermal damage:

• Select appropriate grinding parameters.

• Reduce excessive grinding pressure.

• Use sufficient coolant whenever required.

• Maintain stable cutting conditions.

Compatibility with Ferrous Materials

Diamond brazed wheels should generally avoid dry grinding of ordinary steels because diamond may react with iron at high temperatures, accelerating carbon diffusion and abrasive wear.

However:

• Cast iron can often be machined successfully because carbon saturation reduces chemical reaction risks.

• Steel machining may also be possible when sufficient coolant is applied and grinding temperatures are effectively controlled.

Inspect Before Continued Use

Stop using the wheel immediately if:

• Brazed layers show cracks.

• Large amounts of abrasive grains detach.

• The substrate becomes damaged.

4. Additional Recommendations Based on Grinding Applications

Different grinding operations require different wheel specifications and operating methods.

Selecting the correct grinding wheel according to the application is essential for achieving stable performance, longer wheel life, and high-quality results.

4.1 Cylindrical Grinding

Cylindrical grinding is commonly used for precision machining of shafts, bearings, and rotational components.

Key Recommendations:

• Ensure proper matching between wheel speed and workpiece speed.

• Avoid excessive workpiece speed, which may negatively affect surface finish.

• Maintain sufficient coolant flow to control grinding temperature.

• Select wheel hardness and structure according to material hardness and stock removal requirements.

Incorrect parameters may cause:

• Burn marks

• Poor surface roughness

• Excessive wheel wear

4.2 Internal Grinding

Internal grinding involves grinding the inside diameter of holes or bores.

Because the grinding wheel spindle is usually long and relatively thin, rigidity is lower than external grinding.

Key Recommendations:

• Avoid using an excessively large wheel diameter compared with the bore size.

• Select a suitable wheel size to reduce vibration.

• Maintain stable spindle support.

• Use proper dressing methods to maintain wheel accuracy.

Common problems include:

• Chatter marks

• Taper errors

• Poor dimensional accuracy

4.3 Surface Grinding

Surface grinding is widely used for producing flat and accurate surfaces.

Key Recommendations:

• Ensure smooth table movement.

• Avoid collision between the wheel edge and workpiece shoulders.

• Check that magnetic chucks or fixtures securely hold the workpiece.

• Maintain proper grinding depth and feed rate.

Improper operation may cause:

• Wheel damage

• Workpiece movement

• Surface defects

4.4 Cutting and Slotting Operations

Cutting wheels and thin grinding discs require special attention because of their thin design.

Key Recommendations:

• Always use dedicated cutting-off wheels for cutting operations.

• Never apply side pressure to cutting discs.

• Maintain straight cutting direction.

• Apply steady and controlled feed pressure.

• Do not force the disc into the workpiece.

Side loading may cause:

• Disc bending

• Cracking

• Dangerous wheel breakage

4.5 Form Grinding

Form grinding requires high dimensional accuracy and excellent wheel shape retention.

Key Recommendations:

• Select a grinding wheel with suitable hardness and bond characteristics.

• Choose a bond system according to required profile accuracy.

• Perform frequent dressing to maintain wheel geometry.

• Avoid excessive grinding pressure that may distort the profile.

5. Final Summary: How to Use Grinding Wheels Correctly

Although grinding wheels appear simple, their performance depends on the interaction of many factors, including:

• Abrasive grain type

• Bond system

• Wheel structure

• Machine condition

• Workpiece material

• Coolant selection

• Grinding parameters

• Operator technique

Correct selection, installation, operation, and maintenance are essential for achieving maximum performance and ensuring operator safety.

Key Rules for Different Grinding Wheels

Conventional Abrasive Wheels

✔ Select the correct abrasive according to workpiece material.
✔ Prevent wheel loading and abnormal wear.
✔ Protect wheels from moisture and contamination.

Superabrasive Wheels

Diamond Wheels

✔ Excellent for carbide, ceramics, glass, and brittle materials.
✘ Avoid grinding ferrous metals such as steel and iron under high-temperature conditions.

CBN Wheels

✔ Ideal for hardened steels and heat-resistant alloys.
✔ Pay special attention to coolant selection and temperature control.

Vitrified Bond Wheels

✔ Excellent heat resistance and dimensional stability.
✘ Avoid strong impact, vibration, and thermal shock.

Resin and Rubber Bond Wheels

✔ Excellent elasticity and self-sharpening performance.
✘ Protect from excessive heat, strong alkaline coolant, oil contamination, and long-term storage.

Metal Bond Wheels

✔ Excellent wear resistance and long service life.
✔ Suitable for heavy-duty and precision applications.
✘ Require proper dressing and effective cooling.

Electroplated and Brazed Wheels

✔ High cutting efficiency and excellent abrasive exposure.
✘ Avoid impact, overload, and excessive grinding forces.
✘ Replace when abrasive layers are worn or bonding damage occurs.

Conclusion

A grinding wheel can only deliver its designed performance when it is correctly selected, properly installed, and operated under suitable conditions.

By understanding the characteristics of different abrasives, bond systems, and grinding applications, users can significantly improve:

• Grinding efficiency

• Wheel service life

• Surface quality

• Production stability

• Operator safety

Following proper grinding wheel practices not only maximizes machining performance but also reduces operational risks and improves overall productivity.