The baffles are thin plates positioned for the entire length of the tube bundle.
They have two primary functions:
Sustain the tube bundles
Increase the heat-transfer by changing the flow of the fluid and generating turbulence
Baffles have generally a thickness between 10mm to 20mm and they are usually machined in stacks of 2 to 5 plates, making the drilling operation more complex.
Baffles
The baffles are thin plates positioned for the entire length of the tube bundle.
They have two primary functions:
Sustain the tube bundles
Increase the heat-transfer by changing the flow of the fluid and generating turbulence
Baffles have generally a thickness between 10mm to 20mm and they are usually machined in stacks of 2 to 5 plates, making the drilling operation more complex.
Baffles are generally drilled in stacks from 2 - 5 plates
Single plate thickness vary from 10mm - 20mm
Welding the plates together can increase stability
Challenges in Baffle Drilling:
Uneven surface
Space between the plates
Instability
Disc generated at the hole exit between the plates
Proven Machining Operations
Drilling
Tubesheets have different sizes and a series of holes are done to create a place where the tube ends are welded.
Depending on the hole size and plate material, WIDIA can cover this application with TDMX, TC4 and VariDrill
Drilling of Stacked Plates
Baffles are generally machined in stacks of 2 to 5 plates. Common material is low carbon steel. To face this application with confidence WIDIA offers the TDMX Modular Drilling platform, in combination with the flat bottom insert geometry FPE
Hole Finishing
If necessary, WIDIA is capable of covering fine finishing operations with the TRF / TRM product series
Turning
To remove the surface impurity on tube sheets, these are machined with a turning operation. WIDIA offers a wide range of Heavy duty inserts, as well as ISO turning inserts to cover all the most common materials
Extra stable pocket seat design enables high feed rates even in tough conditions, resulting in an increase of productivity and decrease in cost per hole
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