Joining systems for Blind rivet nut setting

The blind rivet nuts are fed as bulk material of a feed unit with vibrating helical conveyors and are provided bearing-bearing. The separated blind rivet nut is transported pneumatically through a delivery hose into the loading head of the setting tool. There, the nut falls into the loading head, which is moved under the pulling tool. The drawing tool, which moves in a support sleeve, is then lowered onto the blind rivet. Then, the winding operation starts, in which the drawing tool is rotated by the servomotor and at the same time is pushed downwards by the screwdriver stroke as a feed, so that it screws into the shank of the blind rivet nut. Through the monitoring of the torque, the smooth running of the thread is checked at the same time. When the screwing depth and the cut-off torque are reached, the turning and feeding movement of the drawing tool stops. The charging head is then moved aside. For the subsequent riveting process, the blind rivet nut screwed onto the drawing tool is lowered, placed in the existing bore of the workpiece, and the rivet head is pressed onto the workpiece by the support sleeve. An optional search function also allows the setting of rivets with a hexagonal profile in the corresponding hexagon holes. The set head of the blind rivet nut is fixed by the support sleeve and the drawing tool is pulled upwards in the support sleeve with force-travel monitoring. As a result, the shank of the rivet nut is compressed and a closing head is formed. After the nut is riveted, an optional torque test can check the rivet for tight fit. For this purpose, the torque riveted in the tool is subjected to a torque and the angle of rotation is checked. Then the drawing tool is unscrewed from the rivet nut in the reverse direction and moved upwards. Then the next joining cycle can start. If one of the working steps, For example, the predefined setting path is exceeded before reaching the screwing depth or is not reached in the end position, the control issues a NIO message.