HermeSys Laser Seam Welding System

Description

Design Features

• Optimized motion subsystem for laser seam welding
• Standard 4-axis configuration supports 3D weld profiles
• Optional active drive or passive part clamping assembly

Direct-Drive Technology

Weld contours on implantable devices often have small features that result in large accelerations during the weld process. The direct-drive technology used on the linear and rotary axes of the HermeSys minimizes tracking errors through these complex contours. Directly coupled feedback devices are also used to ensure accurate placement of the part during the weld process.

Flexible Welding Platform

Devices intended for deployment in the body have strict limitations on the allowable package size. With travels that support package sizes up to 100 x 100 mm the HermeSys has the capacity to handle a wide array of package configurations.

3D Weld Profiles

Many weld profiles require motion in three dimensions to traverse around penetrations in the case. The HermeSys comes equipped with a 14 mm travel vertical axis that allows for non-planar weld profiles to be easily implemented.

Optional Clamp Assembly

The weld process can induce stress on the package due to localized heating of the case. This stress can result in separation of the case halves causing the weld seam to fail. The HermeSys has an optional passive or active driven pneumatic clamp assembly to ensure consistent contact between the case halves during the welding process. This clamp assembly can be calibrated to give accurate and repeatable clamping force.

Real-time Transformation

Aerotech's Automation 3200 control platform includes specialized real-time transformation capability that greatly simplifies path programming. Weld profiles are programmed directly in part coordinate space and transformed in real time to the HermeSys actuator coordinate space. This allows for on-machine modification of the program to optimize the weld profile. Advanced 2D and 3D path optimization tools can be applied to automatically adjust weld speed and laser power to ensure consistent weld quality over a wide range of part features.

Kinematic Part Fixture

An automated load/unload system is recommended to fully utilize the throughput enhancements that are available with the HermeSys system. Aerotech has designed a kinematic coupling system for precision registration of the devices on the rotary axis. The coupling system has wide acceptance angles on the mating interfaces that allow for low cost robotic or pneumatic material handling systems.