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How to avoid PTFE bands falling off the grooves of sinter piston?
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How to avoid PTFE bands falling off the grooves of sinter piston?

2026-03-12
Latest company news about How to avoid PTFE bands falling off the grooves of sinter piston?

Cause A: The roughness of inner tube Ra is too high, or there are tiny welding slag and scratches on the inner wall, which wear down the PTFE layer like a "file". 

Solution: If the cylinder wall roughness Ra is too high or contains weld spatters, it acts like a file. Ensure Ra ≤0.2 and implement strict cleaning protocols.

 

Cause B: Insufficient banding strength. It is a hot-press banding process, the cleanliness of the sinter piston surface or the failure of embedded PTFE material will cause the bands to separate from the powder metallurgy substrate. 

Solution: Optimize parameter of heating temperature and time, clean the surface of sinter piston, redesign the grooves on the sinter piston.

 

Cause C: High-frequency operation raises oil temperature, causing PTFE bands fall down if the gap design between piston and working tube is not reasonable. 

Solution: Verify the linear expansion coefficient and adjust tolerance fits to ensure clearance at 150℃.

 

Cause D: Additives in the shock oil may react with the band material, causing swelling or softening. 

Solution: Conduct soaking tests to ensure full compatibility.

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How to avoid PTFE bands falling off the grooves of sinter piston?
2026-03-12
Latest company news about How to avoid PTFE bands falling off the grooves of sinter piston?

Cause A: The roughness of inner tube Ra is too high, or there are tiny welding slag and scratches on the inner wall, which wear down the PTFE layer like a "file". 

Solution: If the cylinder wall roughness Ra is too high or contains weld spatters, it acts like a file. Ensure Ra ≤0.2 and implement strict cleaning protocols.

 

Cause B: Insufficient banding strength. It is a hot-press banding process, the cleanliness of the sinter piston surface or the failure of embedded PTFE material will cause the bands to separate from the powder metallurgy substrate. 

Solution: Optimize parameter of heating temperature and time, clean the surface of sinter piston, redesign the grooves on the sinter piston.

 

Cause C: High-frequency operation raises oil temperature, causing PTFE bands fall down if the gap design between piston and working tube is not reasonable. 

Solution: Verify the linear expansion coefficient and adjust tolerance fits to ensure clearance at 150℃.

 

Cause D: Additives in the shock oil may react with the band material, causing swelling or softening. 

Solution: Conduct soaking tests to ensure full compatibility.

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