Forewords -------------------------------------------------------------------------------------------------------------- 3 Features and Applications -------------------------------------------------------------------------------------------- 4 Introduction ------------------------------------------------------------------------------------------------------ 4 Specifications ---------------------------------------------------------------------------------------------------- 4 Applications ------------------------------------------------------------------------------------------------------ 4 Layout of instrument -------------------------------------------------------------------------------------------------- 5 Symbols and Illustrations -------------------------------------------------------------------------------------------- 5 Symbols and Illustrations -------------------------------------------------------------------------------------- 5 Measurement and Conversion Table ------------------------------------------------------------------------- 5 Preparation before Measuring --------------------------------------------------------------------------------------- 6 Requirements for the sample ---------------------------------------------------------------------------------- 6 Requirements for the weight of the sample ------------------------------------------------------------------ 6 Requirement for the surface hardened layer of the sample ------------------------------------------------ 6...
1 Forewords History 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, multiplied by 1000. Harder materials produce a higher rebound velocity than softer materials. For a specific group of material (e.g. steel, aluminum.
2 Features and Applications 2.1 Introduction This instrument is an advanced state-of-the-art palm sized metal hardness tester with many new features which are light weight, easy operation, integrated design, high contrast display, low operating temperature, auto compensating for impact direction and etc. It can be widely used for measuring hardness of almost all ferrous and non-ferrous metal materials for scale of Leeb hardness, Rockwell C, B &A, Brinell, Vickers, Shore and Strength.
3 Layout of Instrument 4 Symbols and Illustrations 4.1 Symbols and Illustrations Symbols Illustrations Leeb hardness value used with impact device D Brinell hardness value Rockwell B hardness value Rockwell C hardness value Shore hardness value Vickers hardness value Rockwell A hardness value σb (N/mm2) Strength value 4.2 Measurement and Conversion Table...
5 Preparation before Measuring 5.1 Requirements for the Sample The surface temperature of sample should be less than 120 C. The samples must feature a metallic smooth, ground surface, in order to eliminate erroneous measurements brought about by coarse grinding or lathe scoring. The roughness of the finished surface should not exceed 2μm.
When measuring hardness with this tester, the following has to be noticed: Despite the low mass of the impact body and low impact energy, a relatively large impact force of short duration is generated when the impact body hits the measuring surface. The max. impact force of impact device D is 900N. For heavy samples of compact shape, no particular precautions are necessary.
6.3 Button Description In measuring mode, press it to In measuring mode, press it to switch among normal mode, big enable/disable impact direction font mode and statistics mode In measuring mode, press and hold it to enter main menu indicator ...
Press button consecutively to enter menu until “Scale” displays on LCD, then press to change scales orderly. Press to go to next menu item. Press and hold to save settings and exit menu mode. 6.8 Statistics 6.8.1 Mean Times Press button consecutively to enter menu “Mean time”, then press to change value orderly.
6.9.1 View Press button to enter “View” mode. In this mode, press to turn the page forth or back. Press and hold button to exit “View” mode and go back to “Memory” menu. Press and hold save settings and exit menu mode. 6.9.2 Erase All Press then “Erase all?”...
6.10.3 Calibration Procedure Turn off the calibration function Take measurements on the standard hardness block D and make sure the measuring direction is downward vertically If the hardness value of standard block is HL780, but the reading of tester is HL760, it means this tester need to be calibrated ...
7 Take Measuring 7.1 Loading Spring Hold the main body (the tester) with left hand while right hand is holding loading tube, then push the loading tube with a little force against spring force toward tester until to lock the impact body. Loose the force and let the loading tube returns to the original position.
The devices do not require any particular care other than periodic cleaning of the impact body and the guide tube after performing approximately 1000-2000 tests. During cleaning, the following procedures need to be observed: Unscrew support ring and remove impact body from guide tube. Clean off any dirt and metallic dust from the impact body and the spherical test tip.
10 Introduction of PC Software Data communication software is designed for reading and processing the data of hardness tester. It can read the data from the memory of hardness tester, export the data to the computer and print the data from the computer printer.
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