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A detailed explanation of the slicing process of neodymium magnets

The production of neodymium magnets, from neodymium, iron, and boron recipe to finished neodymium magnetic products, has gone through a multi-layer manufacturing process. And somewhere along that process lies the slicing and cutting phase to manipulate blanks of the neodymium magnet into various shapes, including block, arc, ring, disc, etc.
Today, we will give a detailed explanation of the slicing process of neodymium magnets. But before that, let’s see the equipment required to slice neodymium magnets.

Equipment Required to Slice Neodymium Magnets

Industrial machining of neodymium magnets requires special equipment. They include:

  • QP Slicer

QP Slicer is an industrial slicing machine used by factories and manufacturers to slice neodymium magnets into smaller pieces. And it ensures precise and uniform slicing performance due to the blade head’s hydraulic system.

This slicer also has an adjustable thickness and variable speed. You can use it to cut varying thicknesses of neodymium magnets at a rate of your choice. It’s also designed with an emergency stop feature to prevent accidents during usage.

  • Inner Circle Slicer

The Inner Circle Slicer is another industrial equipment that can cut neodymium magnets into smaller shapes and pieces. In particular, this machine is capable of cutting circles into neodymium magnets.

  • Intermediate-speed Wire Electrical Discharge Machining (WEDM)

Wire Electrical Machining is an industrial process established in the mid-1900s. It is currently one of the most adopted electrothermal machining processes, i.e., cutting, shaping, or removing material from a workpiece using electrical energy and heat.

Intermediate-speed Wire Electrical Machining uses a flexible but tensile traveling wire electrode of about 7-12km, with a high bending strength, vertically positioned in the machining zone to cut through workpieces.

During machining, the electromotive process removes deionized water or other working fluid to remove the particles detached from a workpiece.

  • High-speed Wire Electrical Discharge Machining (WEDM)

High-speed Wire Electrical Machining works the same way as the Intermediate-speed WEDM, albeit with very high speeds of traveling movement of the wire electrode in both directions.

Compared to Intermediate-speed WEDM, High-speed WEDM ensures a 200-600% increase in cutting speed. And because it uses anodic dissolution and electrical discharges in its machining process, some may classify this method as a hybrid machining process rather than pure WEDM.

  • Neodymium Magnet Laser Cutting Machine

A laser cutting machine uses a high-powered laser to cut, mark, engrave, or etch different materials, including metal, steel, aluminum, stone, tile, glass, etc., for industrial or commercial purposes.

The operator will clear a neodymium magnet laser cutting machine to cut through metal and other hard materials. The three types of laser cutters are Co2, Crystal, and Fibre laser cutters.

Some advantages of cutting neodymium magnets with a laser cutter include high precision and accuracy, no risk of contamination, high production speed, control over the shape or pattern of the cutting, and more.

The Slicing Process of Neodymium Magnets

At ROBO Magnetic, we produce large blanks of neodymium magnets. Then, when you order your neodymium magnets in bulk, we slice them according to your requirements.

There are different processes for slicing neodymium magnets, depending on the machine in use and the shape of choice.

Routine Shape Neodymium Magnet

Routine shape neodymium magnets include block, disc, and cylinder. We can cut these shapes using QP Slicer, Inner Circle Slicer, or any WEDM equipment, depending on the shapes you want.

To facilitate batch processing, we often bond a few blanks of neodymium magnets together before putting them into a cutter.

Irregular Neodymium Magnet (magnet with countersunk, arc, special-shaped)

Irregular-shaped neodymium magnets include arc, block, ring, and tubes with countersunk holes and special shapes. For these, we prefer using a laser cutting machine.

Neodymium Magnet Laser Cutting Machine

To cut neodymium magnets with a laser cutting machine, we use the following process:

  • Draw or design the cut pattern to load into the laser cutting machine on our computer.
  • Send the design to our laser cutter software.
  • Set the power and speed of the laser cutter depending on the required cut depth.
  • Put the neodymium magnet in the laser cutter machine and position the laser where we want the cutting to start.
  • Position the lens appropriately to make sure it is focused.
  • Let the laser perform a sample movement to ensure it doesn’t go over the workpiece we are cutting.
  • Put on the fume extractor to channel smoke appropriately.
  • Begin the cut.

We use the laser cutting machine to cut, mark, engrave, and etch neodymium magnets according to the customer’s description.

The Drawings to be Provided by the Customer

For our job to be perfect, the customer must provide information beforehand. These include:

Size

We must have your desired size in all dimensions for the neodymium magnet. For block, rectangle, and cube shapes, you must provide the following:

  • Length: this is how long you want the neodymium magnet to be from the front to the back. e.g., 15mm.
  • Width: the width is how wide the neodymium magnet should be from left to right, e.g., 10mm.
  • Height: the height refers to measuring the neodymium magnet from the top to the base, e.g., 5mm.

For disc and cylinder neodymium magnets, you must provide the following:

  • Diameter: the diameter refers to the surface of the neodymium magnet when measured across the center from edge to edge, e.g., 12mm.
  • Thickness refers to the measurement from the top edge to the bottom edge. Typically, a disc neodymium magnet will have a smaller thickness than the diameter, e.g., 1mm. On the other hand, the cylinder neodymium magnet will have a much longer thickness than the diameter, e.g., 25mm.

Countersunk Holes

Countersunk holes allow users to screw or nail neodymium magnets to other materials. Screws with countersunk heads will fit perfectly into countersunk holes, so the screw does not protrude from the surface.

When ordering neodymium magnets with countersunk holes, you’re expected to provide the size of the hole.

Tolerance?

Tolerance refers to the permissible differences between the finished product and the dimensions you requested. Ideally, this is stated in “plus or minus” form, e.g., ±0.05. Of course, exclusively positive or negative tolerances are all doable to conform to your requirement.

When ordering neodymium magnets, be sure to specify the following dimensional tolerances.

  • Block: tolerance of length, width, and height.
  • Disc and cylinder: tolerance of diameter, thickness.
  • Ring and Tube: tolerance of outside diameter, Internal diameter, thickness.

What Is the Angle of chamfer required?

A chamfer is an angle formed by cutting away an edge of a neodymium magnet such that the original edge becomes a surface with two new edges.

A block workpiece with chamfer angles will have four edges. When ordering neodymium magnets with chamfer angles, provide the drawing of the angle of the chamfer and chamfer dimensions.

Personal Cutting of Neodymium Magnets

If you got your hands on a block of the neodymium magnet for personal use but found it too big for your needs, you can attempt cutting some parts of it away. However, be mindful of the effects and dangers.

Effect of Cutting a Neodymium Magnet in Half

There are many outcomes to cutting a neodymium magnet in half. We examine some of them below.

  1. You get two smaller neodymium magnets.
  2. Both pieces still have magnetism, and the new surfaces will form new North or South poles for each piece. Depending on the magnetic poles on the new surfaces, they may attract or repel one another.
  3. Once you cut a neodymium magnet in half, the magnetic force will be distributed between both pieces. 
  4. Reattaching cut neodymium magnet halves to one another will not return them to their original strength.
  5. Since the new surfaces are not protected like other parts of the neodymium magnet, they are susceptible to corrosion.

Can You Cut a Neodymium Magnet with a Hacksaw?

Yes, you can cut a magnet with a hacksaw. However, there is no guarantee that it will retain magnetism after the wrong operation experiment. We have heard of people who claimed to have cut magnets using a hacksaw, but, in many cases, they lose the ability to magnetize.

If you have a magnet you would like to make smaller, you can try cutting it with a hacksaw to see if it will still work. However, there are a few things you should note for your safety and the functionality of the magnet.

  1. Depending on the material, you may fail in cutting some neodymium magnets with a hacksaw. In this case, you can try a diamond-plated wheel instead.
  2. To prevent damage to the neodymium magnets, you must be careful while cutting them.
  3. During cutting, particles of the neodymium magnet may begin flying around. So remember to put on protective gear before you start the cutting.
  4. Keep a coolant nearby. The friction between the hacksaw and the neodymium magnet will generate heat, resulting in a loss of magnetism. So it would be best if you control the temperature to avoid damage.

Can You Cut a Neodymium Magnet with a Grinder?

Cutting neodymium magnets with a grinder is faster and easier than cutting them with a hacksaw. It requires less energy and time. However, there are new issues you will face.

A grinder, or angle grinder, is a commercial cutting machine that you can use to cut several materials, including metal, aluminum, concrete, bricks, pavers, wood, and other dense materials. It can also polish and smoothen rough surfaces, especially wood.

Angle grinders are versatile tools; you can use them with varying disc sizes for different jobs. You will likely be more successful using an angle grinder to cut neodymium magnets at home than a hacksaw.

To cut a neodymium magnet with an angle grinder, follow this process:

  1. Wear personal protective equipment, including goggles, gloves, ear protection, leather apron, and mask.
  2. Cutting metallic objects with angle grinders generates sparks, and the dust from magnetic metals is often highly flammable. So keep a fire extinguisher close.
  3. Instruct anybody working with you to stand at a distance to avoid injury from the neodymium magnet particles flying around.
  4. Grip the neodymium magnet you desire to cut to your workbench with a vise.
  5. Mark the spot where you would like to cut the neodymium magnet.
  6. Start your grinder and gently place it on the marked line, applying light pressure.
  7. Routinely apply a coolant to the neodymium magnets to keep them from overheating.

Can You Drill into Neodymium Magnets?

Yes, you can drill into neodymium magnets using a power drill. However, you cannot just bore holes into them like a wood log. Neodymium magnets are brittle by nature. So their chance of chipping or breaking while drilling them is high.

When drilling into neodymium magnets, ensure that you use a diamond-tipped drill. It works better than an iron-tipped drill by grinding it into the neodymium magnet.

Also, remember to drill your neodymium magnets very slowly and take frequent pauses to pour a coolant to avoid demagnetizing the material. To prevent the neodymium magnet from breaking into pieces, try drilling it from both sides.

When you are through drilling your neodymium magnet, spray the hole with a coating material to prevent corrosion.

Where to Buy Neodymium Magnets?

ROBO Magnetic is a high-tech OEM factory manufacturing and supplying high-quality custom neodymium magnets. Our process ensures that our neodymium magnets remain the best in the industry, and our staff offers the best services. Contact us today to discuss your needs and how we can help with your project.

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Article by

ROBO Magnetic Product Team

We are the manufacturer with 16 years of experience in custom neodymium magnets.

Need A Quote? Get in touch with us directly.

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