Brinell Hardness Test

Summary

The video explains the Brinell hardness test procedure using a turbocharger housing as an example. The tester first familiarizes themselves with the machine, which includes a control panel, microscope lens, and indentor. After setting up the test piece, the tester selects a suitable spherical indentor and positions the turbocharger housing. The test begins with the indentor pressing into the test surface, and after a precise application of force, the indentation is measured. The machine calculates the hardness value, which is displayed on the screen, providing a result of 250 Brinell hardness.

Takeaways

• 🔧 The Brinell hardness test is being used to measure the hardness of a turbocharger housing.
• 🖥️ The tester must first familiarize themselves with the testing machine, which includes a monitor and control panel.
• 🔍 A microscope lens with a digital camera and an indentor are key components of the testing machine, rotating towards the test piece as needed.
• 🔄 The machine allows the indentor to be swapped out for different testing methods, making it versatile for various hardness tests.
• 📏 The support table is adjustable in height to ensure the test piece is correctly positioned relative to the microscope lens and indentor.
• ⚙️ The Brinell test involves pressing a spherical indentor with a defined force onto the surface of the test piece.
• ⏱️ After focusing on the test spot, the tester initiates the process by pressing the start button, triggering the test.
• 📊 The machine applies force gradually and precisely to ensure accurate results, holding the test piece under force for a set period.
• 👁️ The indentation created by the test is visible on the monitor, where the tester measures its diameter using the control knob.
• 📉 The hardness value, calculated by dividing the test force by the area of the indentation, is displayed on the screen.

Q & A

What is the purpose of the Brinell hardness test described in the script?

The purpose of the Brinell hardness test is to measure the hardness of a material, in this case, a turbocharger housing, by pressing a hard spherical indenter onto the test piece and evaluating the indentation.

What components are involved in the Brinell hardness testing machine?

The testing machine includes a control panel, a monitor, a microscope lens with a digital camera, an indenter, and an adjustable support table to position the test piece.

How does the Brinell test machine adjust to different methods of hardness testing?

The indenter can be selected and exchanged, allowing the machine to conduct different hardness testing methods on the same device.

What steps are taken to prepare the turbocharger housing for the test?

The turbocharger housing is placed on the adjustable support table, the microscope lens is positioned vertically, and the correct height of the test piece is adjusted to bring the surface into focus.

How is the specific area for testing on the turbocharger housing selected?

The tester focuses on the surface of the test piece and selects the exact spot for testing before pressing the start button to initiate the procedure.

What happens when the Brinell hardness test begins?

The testing machine rotates the lens back to its resting position, places the spherical indenter on the test piece surface, and gradually applies the specified force shock-free. After the test time is completed, the indenter lifts off automatically.

How is the hardness value calculated in the Brinell test?

The hardness value is calculated by dividing the test force (F) by the area of the indentation (A) in square millimeters. This result is displayed on the screen.

What information is displayed on the screen after the Brinell test is completed?

After the test, the diameter of the indentation is measured, and the Brinell hardness value is displayed on the bottom left corner of the screen.

How is the diameter of the indentation measured?

The tester uses a control knob to place four measuring lines on the edges of the indentation, which allows the machine to calculate the diameter.

What is the significance of the indentation in the Brinell hardness test?

The size of the indentation is used to determine the material's hardness. A smaller indentation generally indicates harder material, while a larger indentation suggests a softer material.