Using (3) three Ogura spring applied brakes for the x,y and z axis for holding during robotic welding operation.
Ogura SNB series.
Will depend upon torque requirements.
Description of Operation
The steel boxes move down the assembly line and when they get into the spot welding location the servo motors (M1, M2, and M3) move the welder along the perimeter of the steel casing applying spot welds. Whenever the servo motor stops and either the x, y, or z axis the spring applied brake instantly holds the assembly in position so the weld is applied accurately.
Reason for Selection of the Ogura SNB Spring Applied Brake
The SNB series offers high holding torque in a compact design. This thin design allows the SNB to be placed inside of the ball screw housing allowing as much travel as possible, but eliminating the chance for potential contamination by having an externally mounted brake. The SNB series also has a thick friction disk which allows for stopping instead of just holding (for holding only you would use the RNB series brake). Normal operating voltage for the brakes is either 24 or 90 so they can be wired into most servo and stepper motor systems quite easily.
Besides an automatic welder there are many other robotics applications requiring spring applied brakes. Almost any ball screw application in a z axis will require a spring applied brake for holding the load when the power is off. Some servo motor manufactures are incorporating spring applied brakes right into their motor. They are not manufacturing these themselves, but are purchasing these from brake manufacturers. Other traditional applications for spring applied brakes are on hospital equipment where safety is a concern. Items like patient tables or X-ray equipment normally have spring applied brakes to hold the load in case of a power failure.