Cryogenic deburring

In the rubber industry, cryogenic deburring uses a combination of cryogenic cooling (usually with liquid nitrogen) and mechanical processing. The process comprises the following steps:

• Cooling: the workpieces are cooled to temperatures between -80 °C and -150 °C in a special chamber. This is done by injecting liquid nitrogen, which lowers the temperature.

• Mechanical processing: deburring is achieved by targeted friction. Depending on the workpiece geometry, different methods are used. Tumbling process: the workpieces are moved in a rotating drum and rub against each other, causing the brittle burrs to break off.

• Blasting process: for more complex geometries, an abrasive medium (such as plastic granules) is blasted onto the workpieces with compressed air to remove burrs that are difficult to reach.

• Removal and inspection: after deburring, the workpieces are removed from the chamber, cleaned and subjected to a quality inspection.

The choice of a suitable cryogenic deburring system depends on the geometry of the workpieces and the position of the burrs:

• Tumbling process: suitable for parts with simple geometry and burrs located on the outer edges or in easily accessible places.

• Blasting process: ideal for parts with complex shapes, undercuts or burrs in places that are difficult to access, where friction alone is not sufficient.

Tumbling process

• Principle: the workpieces are moved in a rotating drum and rub against each other, which removes the brittle burrs.

• Advantages: cost-efficient and ideal for large quantities with simple geometries.

Blasting process

• Principle: abrasive media are blasted onto the workpieces with compressed air to remove the burrs precisely.

• Advantages: high precision and suitable for complex moulded parts.

Cryogenic deburring is used in many industries, especially in elastomer and plastics processing:

Rubber and plastics industry

• Seals: precise removal of burrs from elastomer seals.

• Moulded parts: deburring of complex moulded parts for the automotive and medical sectors.

Automotive industry

• Elastomer parts: door seals, rubber buffers and protective caps.

• Vibration dampers: burr-free components for engine mounts and chassis components.

Medical technology

• Silicone parts: hygienic and precisely manufactured parts such as seals, tubes and membranes.

Cryogenic deburring offers numerous advantages, particularly in the manufacture of elastomer parts:

• Precision: burr-free and uniform results even with complex geometries.

• Gentle on the material: no damage to the surface of the workpieces.

• Efficiency: processing of large quantities in a short time.

• Environmental friendliness: no chemical deburring agents are used.

Despite the advantages, there are some challenges:

• Energy consumption: the use of cryogenic media (e.g. nitrogen) requires a high energy input, especially as the system has to be actively cooled.

• Investment costs: purchasing and operating special cryogenic deburring systems is expensive.

• Material limitations: not all materials are suitable for cryogenic deburring, as some materials do not become brittle at low temperatures.

Property	Cryogenic deburring	Thermal deburring	Manual grinding
Precision	Very high	Medium	Medium
Gentle on material	Very high	Limited	Low
Production volume	Ideal for large series	Suitable for large series	Limited to small series
Costs	High	Medium	Low
Environmental friendliness	Yes, as no chemicals are used	Limited	Depends on the abrasive

• Which materials are suitable for cryogenic deburring? Elastomers in particular, such as EPDM, NBR and silicone, as well as certain engineering plastics.

• Why is cryogenic deburring particularly suitable for elastomers? Because elastomers remain flexible even at low temperatures, while the burrs become brittle and break off.

• Which geometries can be deburred particularly well? Both simple and complex components with burrs that are difficult to access, depending on the process (tumbling or blasting).

Cryogenic deburring is a highly precise and efficient process for finishing rubber and plastic parts. In the rubber industry in particular, it enables burr-free production of seals, moulded parts and technical components. Despite the high investment and operating costs, it remains an indispensable technology in modern manufacturing processes thanks to its precision and gentle treatment of the material.