EP5 demontage d'un moteur asynchrone - remontage des roulements

Summary

This video script outlines the process of cleaning and reassembling mechanical parts, specifically focusing on the reinstallation of bearings. It highlights the use of a hydraulic press for one method of bearing installation, as well as two alternative methods: induction heating for a stress-free assembly known as 'Frage assembly', and a special SKF hammer set designed for bearing installation. The script emphasizes safety with the use of protective glasses around compressed air and particles, and the importance of removing old grease before applying new grease for smooth reinstallation. It also demonstrates the induction heating process, using a 'bearing Eater' to heat the bearing to 110°C for easy assembly, showcasing a practical approach to machinery maintenance and repair.

Takeaways

• 🧼 The video discusses cleaning disassembled parts before reassembly, emphasizing the use of safety glasses due to the presence of compressed air which may contain metal particles and rust.
• 🛠️ It shows how to use a hydraulic press to reassemble a bearing, highlighting the importance of applying grease to the bearing races before reassembly for easy extraction in the future.
• 🔍 The presenter demonstrates the use of a special support to press the bearing into place, ensuring it is fully seated to the shoulder for easy reassembly.
• 🔨 An alternative method for bearing reassembly is introduced using a SKF case with special sleeves and a mallet, noting the presence of sand inside the case which creates a noise during the process.
• 🔧 The video mentions the use of a non-rebound hammer for bearing reassembly, explaining that the hardness of the steel bearings makes them susceptible to damage from impact.
• 🔥 The third method for bearing reassembly presented is induction heating, which is recommended as it does not cause any shock to the bearing.
• 📐 The 'Bearing Eater' induction device is used to heat the inner and outer rings of the bearing so they expand and can be easily assembled onto the shaft.
• 🌡️ A temperature probe is crucial for monitoring the temperature during the induction heating process, aiming to reach a specific temperature for proper bearing fit.
• 👷‍♂️ The video stresses the importance of removing old grease before reassembling the bearing and applying a thin layer of new grease to the races to facilitate assembly.
• ⚙️ Lastly, the video hints at a future demonstration on how to reassemble the motor, including the use of a torque wrench for tightening, emphasizing safety and precision in the process.