Research On The Key Technologies And Design Of The Assembly Of Rivet And Rolling Bearing Ribbon Cage

The assembly of rivet and ribbon cage is a key procedure in rolling bearings’cage assembly. Its quality has a great affect on the rolling bearings’performance. Aiming at solving frequently occurrence of rivet missing, poor reliability, labor-intensive in the traditional assembly of rivet and ribbon cage, the key technologies of the assembly of rivet and ribbon cage is researched in this dissertation, and the main modules of the new rivet assembly machine are comprehensively designed, including the mechanical structure, control system and so on. The new rivet assembly machine improves the efficiency and reliability of the rivet assembly, and solves the current problems of rivet assembly effectively. The main contents are as follows:1. The traditional assembly process is analyzed, and the main reason of Rivet missing and poor reliability is discussed. On this basis, a new assembly process is determined; the assembly scheme of each module is designed.2. Based on the assembly requirements, the mechanical structure of assembly jig, feeding system, assembly actuator unit, testing system and transport mechanism are designed. In order to solve the problem of rivet missing, the designs of the Rivet insertion mechanism, rivet inspection mechanism, and intermittent indexing mechanism have been improved. The insertion and release of the rivet are realized by the holding device to avoid the rivets be sticked out or touched down, while the coaxiality between the hole and the rivet is guaranteed. To solve the problem of rivet missing which caused by the contactless testing itself, optical inspection is used to inspect the rivet before it is pressed in. To avoid the rivet skew or missing caused by the shock of the mechanical indexing when starting and stopping, the stepper motor is used.3. Based on the analysis of the control task of assembly system, the hardware framework is determined with a PLC selected as controller, a touch screen as HMI (Human Machine Interface). The key hardware is selected. The electrical schematics of the sensing unit, stepper motor drive unit and human interface unit are given.4. According to requirements of the new assembly process, the program flow chart of control system and the PLC control program are developed. The PLC control programs are consisted of station control program and stepper motor control program. The stepper motor is driven by using four segment S-shaped curve to decline the shock of the rotary table. According to the requirements of monitoring and HMI, a monitoring interface is developed base on touch screen.Some of the results present in this dissertation are applied in a factory, and proved that the rivet missing, assembly quality and reliability are improved significantly, and problems in the traditional assembly of rivet and ribbon cage can be solved effectively.