Telecurso 2000 Manutenção 20 Mancais de rolamento II

Manuais Industriais

19 Jun 201612:55

Summary

TLDRThis educational video script focuses on bearing maintenance, part of a professional training course with 35 lessons. Lesson 20 discusses the identification and causes of bearing failures, emphasizing the importance of preventive maintenance. It covers primary failure types such as wear, misalignment, corrosion, and electrical damage, and secondary failures like flaking and pitting. The script provides tips on identifying and correcting these issues, highlighting the crucial role of proper lubrication and handling in preventing bearing damage. It prepares viewers for the next lesson on sliding bearings, encouraging them to review their study materials.

Takeaways

📚 The video is part of a professional training course with a total of 35 lessons, and this is lesson number 20.
🔍 The lesson focuses on identifying and understanding the causes of bearing failures and how to inspect and maintain bearings as a form of preventive maintenance.
🛠️ Learning to recognize and correct bearing problems is crucial for effective maintenance and can prevent further damage.
🔧 Causes of bearing failure include inadequate lubrication, rough handling, poor alignment, and incorrect assembly.
🛡️ Preventive maintenance is key to identifying and addressing the root causes of bearing issues before they escalate.
🔑 Primary stage failures in bearings can lead to secondary stage failures such as pitting and flaking, which are more noticeable and severe.
👀 It's important to inspect for signs of wear, corrosion, electrical damage, and misalignment to prevent bearing failure.
💡 Adequate lubrication is highlighted as a critical factor in preventing wear and other types of bearing damage.
🛑 Vibration, excessive internal clearance, and noise are indicators that a bearing may be failing and requires attention.
🛠️ Corrective actions for bearing issues include improving lubrication, addressing alignment, and avoiding direct hammer blows during assembly.
📘 The video script also mentions that the next lesson will cover sliding bearings, suggesting a continuation of the topic in subsequent training modules.

Q & A

What was covered in the previous teleaula regarding bearings?
-The previous teleaula covered what a rolling bearing is, how to inspect bearings to detect problems as part of preventive maintenance, and how to properly disassemble and assemble bearings.
What are the primary causes of bearing failures discussed in the teleaula?
-The primary causes of bearing failures include inadequate or insufficient lubrication, rough handling, improper mounting, and external factors such as electrical currents or vibrations.
How can inadequate lubrication affect bearings?
-Inadequate lubrication can cause bearing surfaces to wear out, leading to a dull appearance, and in advanced stages, the surfaces may turn blue or brown due to excessive heat. This is because the lubricant loses its properties or becomes scarce.
What are the signs of bearing damage due to vibrations?
-When bearings are exposed to vibrations, the raceways may develop bright depressions or oxidation marks. In roller bearings, these depressions appear as elongated marks, while in ball bearings, they are circular.
What is the recommended preventive maintenance for bearings exposed to vibrations?
-The preventive maintenance includes identifying and eliminating the source of vibration in the mechanical assembly to prevent further damage to the bearings.
What kind of damage is caused by overloading or improper mounting of bearings?
-Overloading or improper mounting can lead to indentations on the raceways, particularly when excessive pressure is applied during assembly or if the bearing seat shifts. This can also result in cracks or fractures.
What preventive measure should be taken during the assembly of bearings to avoid damage?
-It is important to follow the manufacturer's instructions carefully, apply appropriate pressure during assembly, and avoid using excessive force, such as hammer blows directly on the bearing.
What is the difference between primary and secondary stage failures in bearings?
-Primary stage failures include wear, indentations, scratches, corrosion, and electrical damage. Secondary stage failures, such as spalling and cracks, typically result from the progression of primary stage failures.
What causes corrosion in bearings, and how can it be prevented?
-Corrosion in bearings is caused by exposure to moisture or corrosive substances over time. It can be prevented by using a lubricant that inhibits corrosion and ensuring proper sealing to keep moisture out.
How can electrical currents cause damage to bearings?
-Electrical currents passing through bearings can cause dark brown or black streaks and crater-like formations on the raceways and rolling elements. Preventing this type of damage requires diverting the current away from the bearing, especially during welding operations.

Outlines

00:00

🔧 Bearing Maintenance and Failure Analysis

This paragraph introduces the topic of bearing maintenance within a professional course, focusing on the 20th lesson of a 35-lesson module. It discusses the importance of understanding the causes of bearing failures as a part of preventive maintenance. The speaker identifies various issues such as wear, corrosion, and misalignment, and emphasizes the need to know how to correct these defects. The role of lubrication, handling, and installation in bearing failure is highlighted, with the speaker noting that recognizing these causes is crucial for effective maintenance.

05:01

🛠 Causes and Prevention of Bearing Failures

The second paragraph delves deeper into the causes of bearing failures, such as inadequate lubrication, rough handling, and improper installation. It explains how these factors can lead to specific types of failures, such as pitting and flaking, which are secondary to primary issues like wear and misalignment. The speaker provides examples of how to identify and address these problems, such as ensuring proper lubrication and following manufacturer's instructions for installation. The paragraph also touches on the importance of recognizing early-stage failures to prevent more severe damage.

10:03

🔩 Advanced Bearing Failures and Solutions

In this paragraph, the focus shifts to secondary stage failures in bearings, such as spalling and flaking, which are often the result of primary stage issues. The speaker describes how to identify these advanced failures and the importance of understanding their causes, such as overloading or poor handling during installation. The paragraph also discusses the role of lubrication in preventing corrosion and how to correct issues related to electrical damage. The speaker concludes by summarizing the key points covered in the lesson and encourages further study on sliding bearings in upcoming lessons.

Mindmap

Keywords

💡Teleaula

Teleaula refers to a remote or online class, which is the format of the educational content in the video. It is a key concept as it defines the mode of delivery for the course material on bearing maintenance. In the script, 'teleaula' is mentioned as the medium through which students learn about the various aspects of bearing maintenance.

💡Maintenance

Maintenance in this context is the process of preserving and servicing equipment to prevent breakdowns and prolong its life. The video's theme revolves around the maintenance of bearings, a critical component in machinery, and the keyword is central to understanding the educational objectives of the course.

💡Bearing

A bearing is a machine element that constrains motion between moving parts to define the motion and reduce friction. The script discusses various types of bearing failures and their causes, making 'bearing' a fundamental term for understanding the content of the video.

💡Failure

Failure in the script pertains to the malfunction or breakdown of bearings due to various reasons. The term is integral to the video's narrative as it explores the different types of bearing failures and their implications for maintenance practices.

💡Lubrication

Lubrication is the process of applying a substance to reduce friction between surfaces in mutual contact. In the script, inadequate lubrication is identified as a primary cause of bearing failure, highlighting its importance in the maintenance of bearings.

💡Corrosion

Corrosion refers to the deterioration of a material, usually metal, due to a chemical reaction with its environment. The video script mentions corrosion as a cause of bearing failure, emphasizing the need for proper maintenance to prevent such damage.

💡Wear

Wear is the process of material removal from the surface of a solid body due to relative motion. The script discusses wear as a primary stage failure in bearings, which can lead to secondary failures, thus it is a key concept in understanding the progression of bearing issues.

💡Pitting

Pitting is a form of material degradation characterized by small, localized depressions or holes. In the context of the video, pitting is mentioned as a secondary failure of bearings, resulting from primary failures such as corrosion or wear.

💡Electrical Discharge

Electrical discharge damage in bearings is caused by electrical currents passing through them, leading to localized melting or burning. The script describes this as a type of primary failure, which can cause significant damage to the bearing surfaces.

💡Preventive Maintenance

Preventive maintenance is the practice of regularly servicing equipment to prevent future failures. The video emphasizes the importance of preventive maintenance in identifying and addressing the causes of bearing failures before they become critical.

💡Alignment

Alignment refers to the proper positioning of components to ensure optimal operation. The script mentions misalignment as a potential cause of bearing failure, indicating that correct alignment is crucial for the prevention of such issues.

Highlights

The course module consists of 35 lessons, focusing on professional training.

Lesson 20 covers the inspection and maintenance of rolling bearings.

Understanding the causes of bearing failures is crucial for preventive maintenance.

Lack of proper lubrication or incorrect handling can lead to bearing failure.

Bearing damage can manifest as wear, indentations, or corrosion.

Primary stage failures can lead to secondary stage failures like flaking and pitting.

Vibrations, excessive internal clearance, or noise may indicate a damaged bearing.

Wear in bearings can be caused by inadequate lubrication or vibrations.

Overloading or mishandling during installation can cause indentations in bearings.

Alignment issues can lead to pitting on the top of rolls and guide faces.

External surface pitting may result from the ring rotating against the shaft or housing.

Surface deterioration is often caused by insufficient or inappropriate lubrication.

Corrosion in bearings can be addressed with anti-corrosive lubricants.

Electrical damage in bearings appears as streaks or burns and can be prevented by proper grounding.

Flaking is a sign of end-of-life for bearings and is often caused by deep corrosion or misapplication of load.

Pitting can be a result of rough handling or direct hammer blows during bearing installation.

The session concludes with a review of primary and secondary bearing failures and their causes.

The importance of proper lubrication in preventive maintenance is emphasized.