Seam Welding

Implantable medical devices that rely on electronic assemblies to regulate heart functions or control chronic pain are typically packaged in Titanium clam shell enclosures. These enclosures must be hermetically sealed to ensure that the recipient of the device is protected from infection and to prevent the premature failure of the electronics. The hermetic seal is created through a laser welding process where the part is rotated and translated on a 4 axis motion platform. The creation of the weld path has historically been created with CAD/CAM software where the weld path is broken down into a series of small linear moves. Part geometries that consist of 6 linear/circular features in 2D space result in a program that contains 100s of small linear moves. The relationship between the initial part geometry and the resulting program is lost in the translation.

Aerotechs A3200 Automation platform reduces the complexity of implementing seam welding processes by allowing for programming directly in part coordinates. The part coordinates are transformed in real-time to into motion commands for the axes. Part weld geometry can be changed on the machine as there is a one-to-one correspondence between features on the device and the motion program. With the weld path expressed in a base Cartesian X/Y/Z coordinate system, additional path modifiers can be easily applied. For example rotation matrices can be used to compensate for part alignment errors and surface speed can be regulated to minimize accelerations that occur as a result of small radii features on the part.

The video demonstrates the resulting motion profile created by a simple 5 line program. The ability to append additional rotation matrices to compensate for angular alignment errors is also demonstrated.

Category:

Science & Technology

Tags:

• Seam Welding
• Tumble welding
• hermetic
• pacemaker
• defribrillator
• neurostimulation
• transformation
• robotic
• batteries
• capacitors

[williamyeh]

This is really nice!