| | | nent. Hence, the success of a setting procedure is tested by means of an insertion check. During this test, the assembly component's connection wires located at the underside of the circuit board assembly are clinched with a specified force. Clinching prevents the assembly components from falling off during further transport of the PCB while monitoring of the clinching force provides reliable evidence of the existence of a successfully set assembly component. Monitoring With CoMo Net, Visualization Via Machine Control System Assembly systems are equipped with their own control system, PC and touch screen. | | Therefore, the control monitor CoMo Net with networking capability, which allows integration into machines and company networks, is ideal for monitoring the setting and clinching forces. The setting procedure is monitored by means of a force-time analysis. The CoMo's visual output, e.g. the curve profile of the measured clinching force or setting force is displayed on the machine's monitor. Control signals are linked to the PLC via digital I/Os. A "Max-Min Box" displayed in the second half of the force curve is used for evaluating the clinching process. Some manufacturers of assembly lines offer monitoring of the setting force and completeness checks as standard equipment. | | |
| | | This real-time signal is registered by the machine control system, which will stop the setting process at once. In box 4, an evaluation process will indicate bad and good parts (4+). Upon entry of the signal into the box, the CoMo will send a "not OK" message. The machine operator decides whether a new structural component is to be inserted into the printed-board assembly or whether the finished part requires secondary finishing. Insertion Check During a perfect setting procedure, there will be no resistance to the setting force. Therefore, the setting force control is not able to register a missing structural compo- | | |