Methods of attaching a flat layer to a hub of an axial flow element

1. An axial flow element, comprising:

a hub having a cylindrical outer surface;

a groove disposed in the cylindrical outer surface, the groove extending in a substantially longitudinal direction along the hub from a first end of the hub to a second end of the hub;

a plurality of crush ribs disposed within the groove on both sides of the groove, the plurality of crush ribs spaced apart from one another in the longitudinal direction;

a locking member disposed in the groove; and

a flat layer disposed between the hub and the locking member.

2. The axial flow element of claim 1 , wherein the groove includes a lower wall and two side walls extending radially outwardly from the lower wall in a substantially perpendicular orientation relative to the lower wall.

3. The axial flow element of claim 1 , wherein the plurality of crush ribs is engaged with the locking member.

4. The axial flow element of claim 3 , wherein the plurality of crush ribs are arranged in diametrically opposed pairs that are spaced at approximately equal intervals along a length of the groove.

5. The axial flow element of claim 3 , wherein each one of the plurality of crush ribs includes a beveled portion proximate to an outer edge of the groove.

6. The axial flow element of claim 1 , wherein a width of the groove is less than a diameter of the locking member.

7. The axial flow element of claim 1 , wherein a depth of the groove in a radial direction is greater than a diameter of the locking member.

8. The axial flow element of claim 1 , wherein the groove is one of a plurality of grooves spaced at approximately equal intervals along the cylindrical outer surface, and wherein the locking member is one of a plurality of locking members that are each disposed in a respective one of the plurality of grooves.

9. The axial flow element of claim 1 , wherein the hub further comprises a balancing member disposed on an opposite side of the cylindrical outer surface as the groove.

10. The axial flow element of claim 1 , wherein the locking member is a pin made from a magnetic material.

11. The axial flow element of claim 1 , wherein a length of the locking member is approximately equal to a length of the hub in a longitudinal direction.

12. A method, comprising:

providing a hub, the hub comprising:

a groove disposed on a cylindrical outer surface of the hub, the groove extending in a substantially longitudinal direction along the hub from a first end of the hub to a second end of the hub; and

a plurality of crush ribs disposed within the groove and spaced apart from one another in the longitudinal direction along the length of the groove;

providing a flat layer;

providing a locking member;

positioning the flat layer above the groove;

positioning the locking member above the groove and the flat layer; and

engaging the locking member with the plurality of crush ribs that are disposed within the groove on both sides of the groove by pressing the locking member into the groove.

13. The method of claim 12 , wherein the locking member comprises a pin made from a magnetic material, and wherein positioning the locking member above the groove and the flat layer comprises:

providing a press tool, the press tool comprising a magnetic holder;

engaging the magnetic holder with the pin; and

positioning the magnetic holder above the groove and the flat layer.

14. The method of claim 12 , wherein pressing the locking member into the groove comprises deforming a plurality of crush ribs disposed within the groove.

15. The method of claim 12 , wherein positioning the flat layer above the groove comprises advancing the flat layer until a leading edge of the flat layer extends beyond a trailing edge of the groove.