Fixtureless component assembly

Patent metadata

Field	Value
Publication number	US-11034024-B2
Application number	US-201916277374-A
Country	US
Kind code	B2
Filing date	Feb 15, 2019
Priority date	Feb 15, 2019
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

A method of assembling a plurality of subcomponents to form a finished component comprises gripping a first subcomponent with a first end-of-arm tool, wherein the first end-of-arm tool is attached to a first robot arm and grasping a second subcomponent with a second end-of-arm tool, wherein the second end-of-arm tool is attached to a second robot arm. Moving the first and second end-of-arm tools to position the first subcomponent relative to the second subcomponent in a pre-assembly position and then moving the first and second end-of-arm tools to engage interface surfaces of the first and second subcomponents. Forming a joint between the first subcomponent and the second subcomponent with a joining tool attached to a joining robot arm to thereby assemble the finished component.

First claim

What is claimed is:

1. A method of assembling a plurality of subcomponents to form a finished component, the method comprising:
grasping a first subcomponent with a first end-of-arm tool, wherein the first end-of-arm tool is attached to a first robot arm;
grasping a second subcomponent with a second end-of-arm tool, wherein the second end-of-arm tool is attached to a second robot arm;
grasping a third subcomponent with a third end-of-arm tool, wherein the third end-of-arm tool is attached to a third robot arm;
moving the first, second and third end-of-arm tools with a system controller adapted to control the first, second and third robot arms and first, second and third end-of-arm tools;
positioning the first subcomponent, the second subcomponent and the third subcomponent relative to one another in a pre-assembly position;
using an inspection camera that is in communication with the system controller to visually locate interface surfaces on the first, second and third subcomponents;
using the system controller and estimating an off-set between the pre-assembly position and a required assembly position;
actuating the first, second and third robot arms and moving the first, second and third end-of-arm tools to engage the interface surfaces of the first, second and third subcomponents;
actuating the first, second and third robot arms and moving the first, second and third subcomponents to the required assembly position,
measuring torque forces and lateral forces placed on the first, second and third subcomponents by the first, second and third end-of-arm tools with sensors mounted on the first, second and third end-of-arm tools, and establishing when the first, second and third subcomponents are in the required assembly position based on the torque forces and lateral forces;
scanning the first, second and third subcomponents and locating assembly datums with a non-contact measuring device;
comparing the position of the first, second and third subcomponents to the required assembly position;
actuating the first, second and third robot arms and moving the first, second and third subcomponents to the required assembly position within established tolerances;
actuating a joining tool attached to a joining robot arm and forming a joint between the first subcomponent and the second subcomponent, and actuating the joining tool and forming a joint between the second subcomponent and the third subcomponent to thereby assemble a finished component; and
using the inspection camera and the system controller and scanning the finished component to verify geometry.

2. The method of claim 1 , further comprising:
after scanning the first, second and third subcomponents and locating assembly datums with a non-contact measuring device, and comparing the position of the first, second and third subcomponents to the required assembly position;
actuating the first, second and third robot arms and moving the first, second and third subcomponents to a thermal distortion compensation position.

3. The method of claim 1 , further comprising:
after using the inspection camera and the system controller and scanning the finished component to verify geometry;
actuating the first, second and third robot arms and moving the first, second and third end-of-arm tools and plastically deforming the finished component.

4. A fixtureless component assembly system comprising:
a first robot arm having a first end-of-arm tool mounted thereon and adapted to grasp a first subcomponent;
a second robot arm having a second end of arm tool mounted thereon and adapted to grasp a second subcomponent;
a third robot arm having a third end-of-arm tool mounted thereon and adapted to grasp a third subcomponent;
a system controller adapted to control the first, second and third robot arms and the first, second and third end-of-arm tools to position the first, second and third subcomponents relative to one another;
an inspection camera in communication with the system controller and adapted to visually locate interface surfaces on the first, second and third subcomponents, wherein the system controller estimates an off-set between a pre-assembly position and a required assembly position; and
sensors mounted on the first, second and third end-of-arm tools and adapted to measure torque forces and lateral forces placed on the first, second and third subcomponents by the first, second and third end-of-arm tools as the first, second and third end-of-arm tools move the first, second and third subcomponents to the required assembly position.

5. The fixtureless component assembly system of claim 4 , further comprising a joining robot arm having a joining tool mounted thereon, wherein the system controller controls the joining robot arm to bring the joining tool into engagement with the first and second subcomponents and join the first and second subcomponents to one another.

6. The fixtureless component assembly system of claim 5 , wherein the joining tool is a welding tool adapted to weld the first subcomponent to the second subcomponent.

7. The fixtureless component assembly system of claim 5 , wherein the first and second robot arms are adapted to exert forces onto the first and second subcomponents to distort the first and second subcomponents to a thermal distortion compensation position prior to joining the first, second and third subcomponents, and to exert forces onto the first and second subcomponents to plastically deform the finished component after the first and second subcomponents are joined.

8. The fixtureless component assembly system of claim 4 , wherein the first and second robot arms are adapted to be controlled by the system controller based on one of position control, wherein the position of the first and second robot arms is controlled based on the three dimensional position of the robot arm within a given space, and force control, wherein the position of the first and second robot arms is controlled based on the forces placed on the first and second end-of-arm tools by the first and second robot arms as measured by the first and second force gauges.

9. The fixtureless component assembly system of claim 4 , wherein the inspection camera is mounted at a fixed position.

10. The fixtureless component assembly system of claim 4 , wherein the inspection camera is mounted onto an inspection robot arm, wherein the inspection robot arm is adapted to move the inspection camera to an inspection position to visually locate the interface surfaces on the first and second subcomponents.

11. The fixtureless component assembly system of claim 4 , further comprising a joining robot arm having a joining tool mounted thereon, wherein the system controller controls the joining robot arm to bring the joining tool into engagement with the first, second and third subcomponents and joins the first, second and third subcomponents to one another.

12. The fixtureless component assembly system of claim 4 , wherein the system controller is adapted to moves the first, second and third end-of-arm tools to the required assembly position based on the torque forces and lateral forces measured by the sensors on the first, second and third end-of-arm tools compared against reference force targets.

13. A fixtureless component assembly system comprising:
a first robot arm having a first end-of-arm tool mounted thereon and adapted to grasp a first subcomponent;
a second robot arm having a second end of arm tool mounted thereon and adapted to grasp a second subcomponent;
a system controller adapted to control the first and second robot arms and first and second end-of-arm tools to position the first and second subcompo

Assignees

• Gm Global Tech Operations Llc

Inventors

• Saez Miguel A
• Spicer John P
• Skurkis Richard

Classifications

• B23K26/032

  using optical means · CPC title

• B23K37/0443 Primary

  Jigs · CPC title

• G05B2219/39131

  Each of the manipulators holds one of the pieces to be welded together · CPC title

• B23K37/0452

  Orientable fixtures (B23K37/0461 takes precedence) · CPC title

• G05B2219/37572

  Camera, tv, vision · CPC title