BEIJING TIME VISION AI INSTRUMENT LTD.
https://timetech-ndt.com/
Email: timehardnesstester@gmail.com
WhatsApp: 008615201625204
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TIME5100 basic model Leeb hardness tester, manufacturer of hardness tester.
The Leeb measuring method was first brought into measurement technology in 1978. It is defined as the quotient of an impact body’s rebound velocity over its impact velocity, measured 1mm away from the surface of the test sample. Voltage proportional to velocity can be given under Electromagnetic Principle. Harder materials produce a higher rebound velocity than softer materials. For a specific group of material, Leeb hardness value represents a direct relationship to its hardness properties.
Formula: HL=1000×(Vb/Va)
Where: HL—Leeb hardness
Vb—the rebound velocity of the impact body
Va— impact velocity of the impact body
When measuring the hardness of a sample material using the traditional static hardness testing method, a change of applied pressure will result in a change in the hardness reading. This will also happen during a Leeb’s Hardness test when you change the impact device. In measuring the hardness of the same test sample with different impact devices, the Leeb’s Hardness values obtained will vary. Handheld Surface Roughness Tester TIME®3110 (TR110) https://timetech-ndt.com/product/handheld-surface-roughness-tester-time3110-tr110/
For example: 720HLD ≠ 720HLG
·Because different converting curves are obtained from different impact devices, when converting hardness L into another hardness value the notation for the converted hardness value should include the impact device used. Ultrasonic Thickness Gauge TIME®2180 https://timetech-ndt.com/product/ultrasonic-thickness-gauge-time2180/
For Example: Hardness HS converted from hardness L using impact device C should be written as 52.8HSHLC.
Hardness HV converted from hardness L using impact device D + 15 should be written as 354HVHLD+15
Hardness HRC converted from hardness L using impact device D should be written as 35.9HRCHLD
TIME5100 basic model Leeb hardness tester, manufacturer of hardness tester.
