Systems and methods for joining a warped workpiece to another workpiece

Patent metadata

Field	Value
Publication number	US-9796134-B2
Application number	US-201514667974-A
Country	US
Kind code	B2
Filing date	Mar 25, 2015
Priority date	Mar 25, 2015
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

The present disclosure relates to methods by which a warped workpiece is reconfigured in a pre-determined manner to reduce a separation between the warped workpiece and a joining workpiece. The warped workpiece is reformed/reshaped, prior to joining, by softening material of the warped workpiece through application of a predetermined amount of energy at or near warping and using a directional force applied to a first surface of the warped workpiece, thus reducing a separation space at a joining interface of the warped workpiece and joining workpiece.

First claim

What is claimed is:

1. A method, for joining a first workpiece having a deformity to a second workpiece, comprising:
positioning the first workpiece adjacent the second workpiece such that a first surface of the first workpiece having the deformity is near a tip of a weld horn and a second surface of the first workpiece is adjacent a first surface of the second workpiece;
softening material of the first workpiece by applying a first predetermined amount of energy from the weld horn to the first surface of the first workpiece at or near the deformity;
applying, after starting to soften the material of the first workpiece, a force to the first surface of the first workpiece at or near the deformity, causing the first workpiece softened to reform to a position generally parallel with a first surface of the second workpiece, thus reducing a separation space at a joining interface formed by the second surface of the first workpiece and the first surface of the second workpiece; and
applying a second predetermined amount of energy, being greater than the first predetermined amount of energy, to the first workpiece reformed to form a welding joint at an interface between the first workpiece and the second workpiece.

2. The method of claim 1 wherein applying the first predetermined amount of energy at or near the deformity on the first surface of the first workpiece and reforming material of the first workpiece are repeated until the separation space at the joining interface is substantially reduced or eliminated.

3. The method of claim 1 wherein applying the force at or near the deformity on the first surface of the first workpiece and reforming material of the first workpiece are repeated until the separation space at the joining interface is substantially reduced or eliminated.

4. The method of claim 1 further comprising positioning, adjacent with and generally perpendicular to the first surface of the first workpiece near the deformity, tip of the weld horn configured to soften and melt material of the first workpiece to form a weld.

5. The method of claim 4 wherein the positioning the weld horn comprises translational and rotational positioning of a device connected to the weld horn.

6. The method of claim 4 wherein the positioning comprises projecting light onto the first surface of the first workpiece.

7. The method of claim 6 wherein the positioning further comprises capturing light reflected at the first surface of the first workpiece using a sensory device.

8. A method, for joining a first workpiece having a deformity to a second workpiece, comprising:
providing the first workpiece and the second workpiece, wherein a second surface of the first workpiece is positioned adjacent a first surface of the second workpiece, forming a joining interface;
softening material of the first workpiece by applying, a first predetermined amount of energy from a weld horn at or near the deformity;
applying, after starting to soften the material of the first workpiece, a force to the first surface of the first workpiece and a second surface of the second workpiece, thereby reducing a separation space present at the joining interface due to the deformity; and
applying a second predetermined amount of energy, being greater than the first predetermined amount of energy, to the first workpiece reformed to form a welding joint at an interface between the first workpiece and the second workpiece.

9. The method of claim 8 wherein applying the force is, in part, generally perpendicular to the first surface of the first workpiece, causing reformation of the first workpiece to a position substantially parallel to the second workpiece.

10. The method of claim 8 wherein applying the first predetermined amount of energy at or near the deformity on the first surface of the first workpiece and reforming material of the first workpiece are repeated until the separation space at the joining interface is substantially reduced or eliminated.

11. The method of claim 8 wherein applying the force at or near the deformity on the first surface of the first workpiece and reforming material of the first workpiece are repeated until the separation space at the joining interface is substantially reduced or eliminated.

12. The method of claim 8 further comprising positioning, adjacent with and generally perpendicular to the first surface of the first workpiece near the deformity, the weld horn configured to soften and melt material of the first workpiece to form a weld.

13. The method of claim 12 wherein the positioning the weld horn comprises translational and rotational positioning of a device connected to the weld horn.

14. The method of claim 12 wherein the positioning comprises projecting light onto the first surface of the first workpiece.

15. The method of claim 14 wherein the positioning further comprises capturing light reflected at the first surface of the first workpiece using a sensory device.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Mckay Neil David
• Wang Pei-Chung
• Gao Dalong
• Blaski Bradley J

Classifications

• B29K2307/04

  Carbon · CPC title

• B29C66/92445

  by steps · CPC title

• B29C66/8163

  Self-aligning to the joining plane, e.g. mounted on a ball and socket · CPC title

• B29K2309/08

  Glass · CPC title

• B29K2055/02

  ABS polymers, i.e. acrylonitrile-butadiene-styrene polymers · CPC title