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Tube expansion evaluation and measurement of processing for the "Expander" tube expansion tool

Tube expansion process using the "Tube Expander"

tube-Insertiontube-Adhesiontube-Completion

   Insertion of tube   Adhesion to the tube and sheet hole Completion of tube expansion fitting

 Tube expansion evaluation and measurement

The appropriate amount of tube expansion for the Tube Expander differs depending on the dimensions of the tube sheet hole diameter, outer diameter of the tube, and tube thickness as well as the material of the tube.
The "tube thickness reduction rate" and "tube inner diameter growth rate" are the two general methods for measuring the degree of tube expansion.

 exp-beforeyajirushiexp-after

     Before tube expansion             After tube expansion

1. Calculation of the tube thickness reduction rate

Wt = ( D-d0 ) - ( H - d1 ) / ( D - d0 ) × 100
d1 = (D-d0)×(1-Wt / 100)

Wt: tube thickness reduction rate (%)
H: sheet hole diameter before tube expansion (mm)
D: outer diameter of tube before tube expansion (mm)
d0: inner diameter of tube before expansion (mm)
d1: inner diameter of tube after tube expansion (mm)

2. Calculation of tube inner diameter growth rate

Wd = d1-( d0 + C ) / ( d0 + C )  × 100
d1 = ( d0 + C ) × ( 1 + Wd / 100 )

In general, it is estimated that Wd is between 1 and 1.2%.

Wd: tube inner diameter growth rate (%)
d0 : inner diameter of tube before tube expansion (mm)
d1 : inner diameter of tube after tube expansion (mm)
C: space between sheet hole diameter and outer diameter of tube (mm) ( C = H - D )

Tube thickness reduction rate and residual contact pressure

exp-Compression-graph

Tube sheet materialTube materialTube thickness reduction rate (%)
SteelSteel7
SteelCopper5
CopperCopper10

 Tube thickness reduction rate and fixing strength

Tube material STB340

fixing-strength-fe

Tube material C6871

fixing-strength-cu

 

 What type of processing does the "Expander" tube expansion tool perform?

 What type of processing does the "Expander" tube expansion tool perform?Click here to go to the page.