How to deburr, descale, polish carbide mechanical seal parts?

Finishing and polishing technology of mechanical seal parts of cemented carbide products

Mechanical seals are precise and complex basic mechanical components. Commonly used metal materials include hard alloys (such as tungsten carbide), high silicon iron, nickel-chromium steel, chrome steel, bronze, carbon steel and cast iron, etc., which will produce burrs, flash, scratches, oxide scale and other defects during the manufacturing process. Do you know what kind of finishing and polishing process mechanical seal parts need to go through to obtain a satisfactory surface effect? ​​In this case, we will share the process technology and methods of deburring, derusting, descaling, polishing and brightening of a hard alloy mechanical seal product. This polishing process solution is also suitable for the surface polishing of sealing parts made by other hard metal materials.

    • jerrylu
    • 2024-06-03


deburring, derusting and polishing effect of carbide mechanical seal

1. Cemented carbide mechanical seal before polishing
burrs and oxide scale on the surface of mechanical seals of carbide parts before polishing


tungsten carbide


edge burrs, surface oxide scale




D 50MM

Pre-polishing process:

powder metallurgy

Post-polishing process:

product assembly

2. Finishing and polishing requirements
  • chamfer and remove flash, grooves without burrs.
  • smooth, bright surface, no burrs, no oxide scale.
3. Details of carbide mechanical seal polishing process:
Process steps (1) rough finishing of chamfering, deburring, descaling (2) fine polishing (3) anti-rust drying
Machinery and equipment centrifugal disc finishing machine centrifugal barrel finishing machine vibratory dryer
Speed highest highest highest
Tumbling media straight cut tri-angle ceramic media 3P finishing media corn cob drying media
Abrasive media to workpiece ratio 4:1 6:1 8:1
Finishing and polishing compound finishing liquid polishing liquid no
Water appropriate amount, liquid level is 20mm above the tumbling media appropriate amount, liquid level is 20mm above the tumbling media no
Polishing time 30 minutes 30 minutes 15 minutes
Remark parts separated and picked up automatically, rinsed with water parts separated and picked up automatically, rinsed with water vibratory drying
4. Finishing and polishing effect of cemented carbide mechanical seal
deburring, descaling, chamfering, polishing, brightening effect of cemented carbide parts mechanical seal
mass finishing, polishing, burnishing, brightening effect of cemented carbide parts mechanical seal

5. Additional instructions
  • The hardness of tungsten carbide is generally between HRA87 and 94. The product volume is not large, so a centrifugal disc finisher is used, with heavy cutting force straight cut tri-angle ceramic media for rough finishing. The sharp tip of the tumbling media can reach into the groove to remove burrs and chamfers.
    Fine polishing uses a centrifugal barrel finisher with high centrifugal force, so the tumbling media uses high-hardness 3P fine polishing media, which can cut lightly, further reduce the roughness and improve the surface brightness.
  • In order to improve the anti-rust and anti-corrosion performance of the product after water treatment, it is immersed in a anti-rust liquid for anti-rust treatment after polishing. Finally, a a href=”” target=”_blank” rel=”noopener”>vibrating dryer is used to dry the surface moisture and dry it.

6. Final summary
  • In this case study, we demonstrate the process of chamfering, deburring, descaling, polishing and brightening the surface of a mechanical seal part made of tungsten carbide.
  • If you need professional technical support for the following mechanical seal product polishing issues, you can refer to the above cases:
    Mechanical seal polishing process technology
    Mechanical seal deburring process technology
    Mechanical parts polishing process technology
    Mechanical parts deburring process technology
    Metal parts polishing
    What abrasive is suitable for carbide polishing
    Introduction to carbide polishing technology
    Carbide deburring polishing process
    How to polish carbide
    What to use for polishing carbide
    Methods for descaling of carbide
    Cemented carbide surface polishing
    What finishing and polishing materials are used for carbide
    Mirror polishing of carbide