Telecurso 2000 Manutenção 17 Recuperação de elementos mecânicos

Summary

This video script offers a comprehensive guide on mechanical maintenance, focusing on the recovery of mechanical elements. It covers the process of disassembling and reassembling mechanical sets, and how to approach the recovery of components like shafts, bearings, and gears. The importance of considering mechanical stress, wear, and deformation is highlighted. Techniques such as welding, metal deposition, and using specialized tools for broken threads are discussed, providing a practical insight into maintaining and repairing machinery.

Takeaways

• 🔧 The video script is a lesson on mechanical maintenance, focusing on the recovery of mechanical elements in professional training courses.
• 🔨 When dealing with mechanical maintenance, the first step is to consider the mechanical stresses acting on the equipment, as they can cause wear, deformation, and cracks.
• 🔧📈 The importance of analyzing the working conditions of mechanical components, such as rotations per minute, environmental conditions, lubrication, and pressure, is highlighted for effective recovery.
• 🔧🛠️ The process of recovering an axis involves defining parameters, analyzing working conditions, choosing materials, and selecting the recovery process, whether it's building a new one or repairing the damaged one.
• 🔨🔥 In the case of axis recovery, welding or metal deposition can be used, with the choice depending on the specific damage and requirements.
• 🔧🔊 The preparation of the axis before welding is crucial, including examining the deformed area, removing activated material, and machining to prepare joints for accurate dimensioning.
• 🛠️🔥 The choice of welding process is essential for efficient axis recovery, with electron beam welding being highlighted for its high mechanical strength.
• 🔧🌡️ Maintaining the preheating temperature during welding is important to avoid deformation due to overheating.
• 🔧🔄 Metal deposition is another method for recovering worn-out axes, which can be done either hot or electronically, with preparation of surfaces being key for uniform deposition.
• 🔧🔧 The recovery of bearings involves ensuring surface compatibility with manufacturer specifications, including dimensional accuracy and surface roughness.
• 🔧🦅 For gear recovery, building an identical replacement is preferred for precision, although welding can be used, it may not result in perfect teeth and could affect other gears over time.
• 🔧🔩 The script also covers the recovery of internal threads, with methods ranging from using expanders to inserting pins or using market-available fastening elements like helicoils or nutserts.

Q & A

What is the main topic of the video script?

The main topic of the video script is the recovery of mechanical elements in maintenance of professional training courses.

What should be considered first when dealing with a machine or equipment in need of maintenance?

When dealing with a machine or equipment in need of maintenance, the first thing to consider is the mechanical stress acting on it, as wear, deformation, and even cracks can be caused by these stresses.

What are the two aspects to consider when recovering movable sub-assemblies?

The two aspects to consider when recovering movable sub-assemblies are static resistance and the dynamic conditions of the assembly in relation to dynamic demands.

What are some characteristics to observe when recovering movable sub-assemblies?

Characteristics to observe include resistance to vibrations, imbalance, wear caused by friction, thermal treatments, geometry of the parts, surface finish, and dimensional accuracy in the regions where components will move.

What is the first step in the recovery process of an axis?

The first step in the recovery process of an axis is to define parameters such as working conditions, knowing the number of rotations per minute, environmental conditions, lubrication deficiencies, and the type of pressure it exerts or supports.

What are the two options for recovering a damaged axis?

The two options for recovering a damaged axis are either constructing a new one or reconstituting the damaged one, which can be done through welding or metal deposition.

Why is the preparation of the axis important before welding?

The preparation of the axis is important to examine the area of deformation, remove activated material, verify the remaining fit, and ensure machining to prepare joints with dimensions in line with available data.

What is the most efficient welding process mentioned for recovering axes?

The most efficient welding process mentioned for recovering axes is electron-beam welding, which is known for its high precision and deep penetration capabilities.

How can worn-out gears be recovered?

The best way to recover worn-out gears is to construct an identical new gear with the same dimensions and tooth profile as the damaged one, ensuring meticulous precision in the process.

What are some methods for recovering an internal thread?

Some methods for recovering an internal thread include enlarging the hole and inserting a pin, using helicoils for threads that have been damaged, or using thread inserts like 'elecor' or 'n-cor' which are high-resistance wire spirals.

What is the importance of surface preparation in the recovery of a bearing housing?

Surface preparation in the recovery of a bearing housing is crucial to ensure compatibility with the dimensional specifications of the manufacturers, including the specified surface roughness.