Clamp force and alignment checking device

Patent metadata

Field	Value
Publication number	US-9618410-B2
Application number	US-201414566130-A
Country	US
Kind code	B2
Filing date	Dec 10, 2014
Priority date	Dec 13, 2013
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

A check fixture measures a total clamp force applied by a welder device. The welder device includes a welding horn having a plurality of weld pads and welding anvil having a plurality of weld pads. The check fixture includes a base member operatively supporting a plurality of force sensors. The base member and the force sensors are received between the weld pads of the welding horn and the anvil pads of the welding anvil. Each force sensor is configured to measure an individual clamp force applied thereto by corresponding weld and anvil pads when the base member is received between the welding horn and the welding anvil and the welder device is in the clamped position. The individual clamp forces are used to determine whether the weld and/or anvil pads are worn or misaligned.

First claim

The invention claimed is:

1. A check fixture for measuring a total clamp force applied by a welder device having a welding horn and a welding anvil with the welding horn and welding anvil being movable between an unclamped position and a clamped position, the check fixture comprising:
a base member having a first side and a second side, opposing the first side; and
a plurality of force sensors operatively supported by the base member;
wherein the base member and the plurality of force sensors are configured to be received between the welding horn and the welding anvil with the welding horn facing the first side and the welding anvil facing the second side; and
wherein each of the plurality of force sensors is configured to measure an individual clamp force applied thereto by the welding horn and welding anvil when the base member is received between the welding horn and the welding anvil and the welder device is in the clamped position.

2. The check fixture, as set forth in claim 1 , wherein the base member defines a plurality of openings extending between the first side and the second side; and
wherein each of the plurality of force sensors is disposed in a respective one of the plurality of openings such that the base member operatively supports the plurality of force sensors.

3. The check fixture, as set forth in claim 2 , further comprising a plurality of plates operatively attached to the first and second sides of the base member such that each of the plurality of force sensors is sandwiched between a corresponding pair of the plurality of plates operatively attached to the first and second sides;
wherein the base member, the plurality of plates, and the plurality of force sensors are configured to be received between the welding horn and the welding anvil such that the welding pads of the welding horn face the plurality of plates operatively attached to the first side and with the anvil plates of the welding anvil face the plurality of plates operatively attached to the second side such that each of the plurality of force sensors is configured to measure an individual clamp force applied to the respective pair of the plurality of plates by the respective weld and anvil pads when the welder device is in the clamped position.

4. The check fixture, as set forth in claim 3 , wherein each of the plurality of plates is attached to the base member at a respective fastening location, spaced a distance from a center of the respective opening; and
wherein the distance is configured such that each of the plurality of plates is cantilevered at the respective fastening location and each of the plurality of force sensors is configured to measure an individual clamp force applied thereto by the respective pair of the plurality of plates, via the welding horn and welding anvil, when the base member, the plurality of plates, and the plurality of force sensors are received between the welding horn and welding anvil and the welder device is in the clamped position.

5. The check fixture, as set forth in claim 4 , wherein each of the plurality of force sensors has a size configured such that each of the plurality of force sensors are in contact relationship with the respective pair of the plurality of plates to measure an individual clamp force applied thereto by the respective pair of the plurality of plates, via the welding horn and welding anvil, when the base member, the plurality of plates, and the plurality of force sensors are received between the welding horn and welding anvil and the welder device is in the clamped position.

6. The check fixture, as set forth in claim 5 , wherein the first and second sides each define a recess extending to a floor;
wherein a span is defined between the floors of the opposing first and second sides;
wherein each of the plurality of force sensors is sized to have a length that is larger than the span;
wherein the pairs of the plurality of plates are operatively disposed in the recess corresponding to the respective first and second sides of the base member such that the plurality of plates cover the respective openings and are in contact relationship with the respective one of the plurality of force sensors to measure an individual clamp force applied thereto by the respective pair of the plurality of plates, via the welding horn and welding anvil, when the base member, the plurality of plates, and the plurality of force sensors are received between the welding horn and welding anvil and the welder device is in the clamped position.

7. The check fixture, as set forth in claim 3 , further comprising a host device in operative communication with each of the plurality of force sensors;
wherein the host device includes a processor configured to:
receive the individual clamp forces from each of the plurality of force sensors applied thereto by the welding horn and welding anvil when the base member is received between the welding horn and the welding anvil and the welder device is in the clamped position; and
determine the total clamp force for the weld tool by totaling the individual clamp forces for each of the plurality of force sensors.

8. A vibration welding system comprising:
a welder device, including a welding horn and a welding anvil, that is configured to apply a total clamp force and form a weld on a work piece clamped between the welding horn and the welding anvil;
wherein the welding horn includes a plurality of weld pads and the welding anvil includes a plurality of anvil pads disposed in facing relationship to the plurality of weld pads;
a check fixture configured to measure the total clamp force applied by the welder device, the check fixture comprising:
a base member having a first side and a second side, opposing the first side; and
a plurality of force sensors operatively supported by the base member;
wherein the base member and the plurality of force sensors are configured to be received between the weld pads of the welding horn and the anvil pads of the welding anvil with the welding horn facing the first side and the welding anvil facing the second side such that each of the plurality of weld pads and each of the plurality of anvil pads are facing a respective one of the plurality of force sensors; and
wherein each of the plurality of force sensors is configured to measure an individual clamp force applied thereto by the respective weld pad of the welding horn and the respective anvil pad of the welding anvil when the base member is received between the welding horn and the welding anvil and the welder device is clamped.

9. The vibration welding system, as set forth in claim 8 , wherein the base member defines a plurality of openings extending between the first side and the second side; and
wherein each of the plurality of force sensors is disposed in a respective one of the plurality of openings such that the base member operatively supports the plurality of force sensors.

10. The vibration welding system, as set forth in claim 9 , further comprising a plurality of plates operatively attached to the first and second sides of the base member such that each of the plurality of force sensors is sandwiched between a corresponding pair of the plurality of plates operatively attached to the first and second sides;
wherein the base member, the plurality of plates, and the plurality of force sensors are configured to be received between the welding horn and the welding anvil such that the welding pads of the welding horn face the plurality of plates operatively attached to the first side and with the anvil plates of the welding anvil face the plurality of plates operatively attached to the second side such that each of the plurality of force sensors is configured

Assignees

• Gm Global Tech Operations Llc

Inventors

• Spicer John Patrick
• Cai Wayne W
• Chakraborty Debejyo
• Mink Keith

Classifications

• G01L5/0085

  Force sensors adapted for insertion between cooperating machine elements, e.g. for measuring the nip force between rollers · CPC title

• B23K20/26

  Auxiliary equipment · CPC title

• G01L5/0038

  applying a pushing force · CPC title

• B23K2201/36

  Operations & Transport · mapped topic

• B23K20/10 Primary

  making use of vibrations, e.g. ultrasonic welding · CPC title