Details:

R & D background


(1) the original "L" shaped forging flange


Advantages:
    The length less welds, bolts, and good fatigue resistance, stiffness flange.

Disadvantages:
    The cost is too high, manufacturing high energy consumption, end milling, large amount of material, the screw hole deviation is not easy to deal with. A large number rely on imports, there are still loose bolts issues, long-term maintenance.
(2) research objectives: reducing flange production of socially necessary labor time, reduce the energy consumption of the flange production.

(B) a new flange direct tension Tunneling Method

 Screw more than 50% longer than the old flange can store more elastic strain energy locking;
 Without torque screw does not exist within the a loose internal factors - rebound torque;
 Without torque, not measured torque coefficient, not oiled, thread friction coefficient is doubled.
Conclusion: no the thread loosening of internal

(13) The comparative technical and economic indicators:

(A) a new flange core values​​: maintenance-free, to reduce the inverted tower hidden, long-term maintenance costs savings for the Party. ('s First run for three years and found no loose bolts);
(B) cost less than the old flange;
(C) the amount of steel Ontario;
(D) manufacturing process simplification, energy conservation.