Splined power transmission components made using heat-assisted calibration process and method of forming such splined power transmission components

Patent metadata

Field	Value
Publication number	US-10837072-B2
Application number	US-201715678611-A
Country	US
Kind code	B2
Filing date	Aug 16, 2017
Priority date	Aug 29, 2016
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

A method for forming a component utilizing ultra-high strength steel and components formed by the method. The method includes the step of providing a flat blank of ultra-high strength 22MnB5 steel. The next step of the method is cold forming the flat blank into an unfinished shape of a component while the blank is in an unhardened state. Then, heating the unfinished shape of the component and generating a spline form thereon. The method proceeds by forming a finished shape of the component using a quenching die resulting in a fine-grained martensitic component material structure and enabling net shape processing to establish final geometric dimensions of the component.

First claim

What is claimed is:

1. A method for forming splines in a component utilizing ultra-high strength steel including the steps of:
providing a flat blank of ultra-high strength steel;
forming the flat blank into an unfinished shape of a component;
heating the unfinished shape of the component;
forming a finished shape of the component including splines using a quenching die having a radially-movable segmented tool;
moving the radially moveable segmented tool of the quenching die radially inward from a radially retracted position to a radially inward position and maintaining the segmented tool in the radially inward position during quenching over a predetermined period of time; and
forming circumferentially adjacent splines of the finished shape simultaneously during the predetermined period of time in which the segmented tool is maintained in the radially inward position.

2. The method of claim 1 , further comprising:
providing an inert atmosphere; and
heating the unfinished shape of the component in the inert atmosphere.

3. The method of claim 2 , wherein the step of heating the unfinished shape of the component in the inert atmosphere is further defined as heating the unfinished shape of the component in the inert atmosphere at a temperature between 850° C. and 950° C.

4. The method of claim 1 , wherein the step of heating the unfinished shape of the component is further defined as heating the unfinished shape of the component at a temperature between 850° C. and 950° C.

5. The method of claim 1 , wherein the step of forming the flat blank into an unfinished shape of a component is further defined as forming the flat blank into a cup-shaped preform without splines.

6. The method of claim 5 , further comprising:
installing the cup-shaped preform on a fixed mandrel, wherein the fixed mandrel includes splines.

7. The method of claim 6 , wherein the step of installing the cup-shaped preform on a fixed mandrel further includes aligning the splines of the fixed mandrel alternately with splines of the radially-movable segmented tool.

8. The method of claim 6 , wherein the step of installing the cup-shaped preform on a fixed mandrel further includes aligning the radially-movable segmented tool in a retracted position relative to the fixed mandrel.

9. The method of claim 1 , wherein the step of forming a finished shape of the component using a quenching die is further defined as forming a finished shape of the component with splines using a quenching die while cooling the component to a temperature between 150° C. and 250° C.

10. The method of claim 1 , wherein the step of forming a finished shape of the component using a quenching die is further defined as forming a finished shape of the component using a quenching die while forming a plurality of spline teeth in the component using the quenching die.

11. The method of claim 1 , wherein the step of forming a finished shape of the component using a quenching die is further defined as arranging a series of radially-movable segmented tools to completely surround and encircle the component to form all splines simultaneously.

12. The method of claim 1 , wherein the step of forming a finished shape of the component using a quenching die is further defined as forming the unfinished shape into a cylindrical shape having a radial ring portion and a cylindrical drum portion and forming a plurality of the spline teeth in the cylindrical drum portion of the clutch housing using the segmented die parts of the quenching die while forming the finished shape.

13. The method of claim 1 , further comprising:
releasing the radially-movable segmented tool; and
removing the component.

14. The method of claim 1 , wherein the flat blank of ultra-high strength steel is of the 22MnB5 ultra high strength steel type.

15. The method of claim 1 , wherein the finished shape has at least one of a cylindrical body or a cup-shaped body.

16. A method for forming splines in a component utilizing ultra-high strength steel including the steps of:
providing a flat blank of ultra-high strength steel;
forming the flat blank into an unfinished shape of a component;
providing an inert atmosphere;
heating the unfinished shape of the component in the inert atmosphere;
forming a finished shape of the component including splines using a quenching die having at least one radially-movable segmented tool;
moving the radially moveable segmented tool of the quenching die radially inward from a radially retracted position to a radially inward position and maintaining the segmented tool in the radially inward position during quenching; and
forming the entire length of the splines while maintaining the segmented tool in a radially inward position.

17. The method of claim 1 , further comprising simultaneously forming splines encircling the component around 360 degrees of the component, and forming the entire axial length of the splines while maintaining the segmented tool in the radially inward position during the predetermined period of time.

Assignees

• Magna Powertrain Usa Inc

Inventors

• Sabo John Richard
• Sulaj Sokol
• Dorigo David Victor

Classifications

• B21D35/005

  characterized by the material of the blank or the workpiece (B21D26/053 takes precedence) · CPC title

• B21D53/28

  gear wheels · CPC title

• F16D2300/26

  Cover or bell housings; Details or arrangements thereof · CPC title

• F16D2250/0023

  Shaping by pressure · CPC title

• B21J5/12

  Forming profiles on internal or external surfaces (making screw-thread by forging, pressing, or hammering B21K) · CPC title