Introduction to Residual Torque: Precise Joint Assembly with Less Waste

Introduction to Residual Torque Precise Joint Assembly with Less Waste

Last Updated on February 12, 2024 by Ossian Muscad

Any manufacturing process is only as good as the weakest link in the chain. That’s why residual torque is so important. This measurement ensures that all junctions are tightened to the correct specification with minimal waste. This article will introduce you to residual torque and explain what it is and why it matters. We will also go into more detail about measuring residual torque and using it to improve your production process!

 

What is a Residual Torque?

Residual torque is the force that remains in a tightened joint after the tightening process is complete. It determines how tightly the joint has been tightened and is an important factor in quality control. Residual torque must be measured to ensure that a joint has been tightened properly.

 

Importance of Residual Torque

Many factors can affect the residual torque of a joint. These include:

  • The type of fastener being used: Different fasteners will have different residual torques.
  • The material being used: Different materials will also have different residual torques.
  • The surface finish: A joint with a smoother surface finish will have a lower residual torque.
  • The environment: The temperature and humidity of the environment can also affect residual torque.

 

Residual Torque Vs. Installation Torque

It’s important to note that residual torque is different from installation torque. In fact, they’re two completely different measures. So let’s break them down:

  • Residual Torque: This force remains in a tightened joint after the tightening process is complete. It determines how tightly the joint has been tightened and is an important factor in quality control.
  • Installation Torque: This is the force required to install the fastener. It determines how easy or difficult it is to install the fastener. At the same time, it also affects the residual torque of the joint.

 

As you can see, residual torque and installation torque are two completely different measures. However, they are both important as they coexist and affect each other.

 

When to Use Residual Torque

Residual torque is most often used in quality control. It’s a way to ensure that all joints are being tightened properly to ensure minimal waste.

Many factors can affect residual torque. As we’ve seen, it’s important to be aware of these factors to ensure your joints are tightened properly. In addition, residual torque is a good way to ensure your production process runs smoothly and efficiently.

Here are scenarios that require the use of residual torque:

  • To check if a joint has been tightened to specification.
  • To ensure that there is minimal waste.
  • To ensure that the production process is running smoothly and efficiently.

 

How to Measure Residual Torque?

Measuring residual torque requires special equipment. The most common type of equipment used is a residual torque meter. This device is designed to measure residual torque in various ways.

The most common type of residual torque meter is the dial indicator. This device uses a pointer to indicate the amount of residual torque on a scale.

Another type of residual torque meter is the digital readout. This device uses a digital display to show the amount of residual torque.

To measure a residual torque, follow the steps below:

  1. Attach the residual torque meter to the joint.
  2. Tighten the joint until it reaches the desired torque.
  3. Read the residual torque from the residual torque meter.
  4. Record the residual torque and compare it to the desired torque.
  5. Finally, remove the residual torque meter from the joint.

 

As you can see, measuring residual torque is a simple process requiring only a few steps. However, it’s important to know the different types of residual torque meters to ensure accuracy and efficiency.

 

Frequently Asked Questions (FAQs)

Q1: What is the impact of lubrication on residual torque?

Lubrication can significantly reduce friction, which, in turn, can alter the residual torque value. Maintaining consistent lubrication practices during assembly is crucial to ensure that the residual torque readings are accurate and reliable. By following proper lubrication protocols, potential issues related to friction and torque can be minimized, leading to improved performance and longevity.

Q2: Can residual torque be affected by the speed of assembly?

Yes, the speed at which a joint is tightened can influence the heat generation and friction during the process, affecting the final residual torque. A controlled and consistent assembly speed is recommended for accurate measurement. Additionally, proper lubrication of the joint can further optimize the tightening process.

Q3: How often should residual torque be measured in a production setting?

The frequency of residual torque measurement should be determined based on the criticality of the joint and the likelihood of variations occurring in the assembly process. It can range from every assembly for critical operations to sampling for less critical joints. Properly assessing and adjusting the measurement frequency ensures optimal performance and reliability of the assembly.

Q4: What are the consequences of incorrect residual torque?

Incorrect residual torque can lead to joint failures, such as loosening or breaking under stress. This can result in product malfunction, safety hazards, and increased costs due to rework or product recalls. That is why it’s crucial to properly manage and control residual torque to ensure the reliability and longevity of the product.

Q5: Are there industry standards for residual torque?

Yes, many industries have specific standards and guidelines to ensure joint integrity. Organizations such as ASTM, ISO, and SAE provide standards for measuring the acceptable range of residual torque for various applications. Following these standards ensures safety and promotes consistency and reliability across the industry.

Q6: When is it necessary to recalibrate residual torque measurement equipment?

Residual torque measurement equipment should be recalibrated periodically according to the manufacturer’s recommendations or when there is a reason to doubt the accuracy due to a potentially damaging event or abnormal reading discrepancies. Frequent use also necessitates regular calibration checks to maintain precision.

 

Streamline Torque Management with DATAMYTE

DATAMYTE is a quality management platform with low-code capabilities. Our Digital Clipboard, in particular, is a low-code workflow automation software that features a workflow, checklist, and smart form builder. This tool lets you create custom forms to streamline data collection, including residual torque measurements.

DATAMYTE also lets you conduct layered process audits, a high-frequency evaluation of critical process steps, focusing on areas with the highest failure risk or non-compliance. Conducting LPA with DATAMYTE lets you effectively identify and correct potential defects before they become major quality issues.

With DATAMYTE, you have an all-in-one solution for quality control and residual torque management. Book a demo now to learn more.

 

Conclusion

Residual torque is a crucial aspect of quality control. It’s a way to ensure that all joints are being tightened properly and that minimal waste exists. Many factors can affect residual torque, and it’s important to be aware of them to ensure your joints are tightened properly.

 

 

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