JMHRS-45precisionsurfaceRockwell hardness tester (head movable)

Product Introduction

JMHRS-45precisionsurfaceRockwell hardness tester(Head of the machine)portableThe advanced closed-loop sensor control technology is adopted to achieve fully automatic control and hardness testing process.

The loading system adopts a high-precision force sensor and a central controller to form a closed-loop loop to achieve continuous tracking and control of the force application process throughout the entire process. The depth measurement system adopts high-precision displacement sensors, which can obtain a minimum hardness value resolution of 0.1HR.

The stage is fixed and hardness testing is performed by moving the indenter up and down. The fixed test bench can eliminate the coaxiality error caused by the up and down rotation of traditional lead screws, greatly improving the accuracy and repeatability of testing, as well as increasing the stability and efficiency of machine operation.

Product Features:

uFully automatic closed-loop sensor loading system, fixed test bench, achieves high-precision and fast testing, and can also provide higher-level standard hardness testers;

uCan achieve remote control;

utest15 typesSurface RockwellHardness scale;

uResolution of displacement sensor0.1HR；

uDetermine repeatability accuracy0.5HR；

uHigh speed step control, extremely fast testing speed（1.75s)；

umeet the standardASTM E18,ASTM E384,ISO6508 GB/T230;

uNew design, noseportable,The rack structure is sturdyGood rigidity;

uHigh precision loading system effectively avoids force overload during measurement;

uHigh precision linear guide rail controls the precise movement of the machine head;

uContinuous measurement in and out of the fixed workbench can be achieved through the automatic retraction function of the pressure head;

uAutomatic lifting of the machine head and automatic initial load test force can ensure stable force generation during measurement;

uhigh definitionLCD touch screen operation, menu based operation interface;

ubacklightLCD display, automatic data statistics and storage, RS-232 data output interface;

uAutomatic loading and unloading, protectionlotusAdjustable time;

uGO/NG公差判断;

uCorrection of test values for cylinders and spheres;

uLinkage between force selection and hardness scale selection;

uThe available operating languages include English and Chinese，Convenient for user operation;

uScale conversionHR、HB、HV;

ubuilt-in printer;

uThe standard configuration is complete and can meet the testing requirements of all rulers;

Product enhancement:

“Aolong Xin”Fully automatic high-speed response closed-loop sensor loading system,Automatic movement of the machine headTo achieve high-precision and rapid testing and improve the control accuracy of the executing mechanism

The original system belongs to millisecond level control system，Unable to achieve step control.

AolongxinThe system belongs to microsecond level control system，It can achieve high-speed step control.

The step control accuracy can reach nanometer level!

Enhance the overall performance of the equipment, improve the detection accuracy and speed of the equipment

1.Improve the ability to process analog signals from power sensors. change'Eyes'

2.Enhance the ability to process overall digital signals. change'Core'

3.Improve the accuracy of displacement measurement. changeEar "

4.Improve the accuracy of motor control. changeHand "

5.Improve the human-machine interface. change'Face'

Set up a dedicated management device for displacement sensorsQEIThe original motherboard does not have a dedicated management device,CPUThe displacement sensor signal must be continuously processed personally throughout the entire loading process.

After setting up a dedicated management device,CPUJust read the data at the beginning and end of the loading processCPUConcentrate resources to manage sensors and load motors, making control faster and more accurate.

Importing high-precision magnetic grid displacement sensors from Japan

The in-situ displacement sensor is a domestically produced grating displacement sensor. There is a problem of poor consistency and it needs to be matched with other devices for selection.

Japanese high-precision displacement sensors have high consistency and are less affected by environmental factors.The lifespan can reachMore than 150 million times.

The traditional electric loading Rockwell hardness tester has a slow loading process, and if the loading speed needs to be controlled within the national standardGBT230/T-91required8Within seconds, a red curve will appear in the test force as shown in the figureFAlways rushing and removing to approachFtotalThe phenomenon. The result of this is that the hardness tester must slow down the testing speed, resulting in a long testing time; Secondly, the phenomenon of overshoot has to some extent affected the accuracy of the experiment.

This device adopts more advanced and applicable technologyCentral processing chipDuring the entire hardness test process, the central processing chip will process 18000 units at ultra-high speed from the start to the end of each hardness test—30000 sets of data. Traditional electric hardness testers require8The loading action that can only be done in seconds, shortened to1.75second(ISO6508-1:99Unified the test force application time to 1~8sInside). As shown by the blue curve in the figure, the speed of the loading process reaches the maximum speed, and the force value is smooth without overshoot during the process of loading to the total test force, which improves the loading speed and accuracy of the electric hardness tester.

Curve Explanation

1.Force value and pressure depth curve.

During the operation of the hardness tester, the main chip reads real-time data from pressure sensors and displacement sensors, and converts the data into curves. The curve in the figure is28.3HRCThe force value and depth curve of the hardness block.

2.pressure-Depth curve

Export synchronized data of pressure and pressure depth during the detection process, and automatically generate pressure-Deepen the curve and determine the shaded area for research on elastic modulus, etc.

Accurate hardness correction

The standard hardness curve is a straight line

The hardness automatic correction of traditional electric digital hardness tester is shown in the figureYellow line segmentThe correction is generally divided into three sections, and only matches the standard hardness near the calibration point. The further away from the calibration point, the greater the difference in hardness values.

pass throughFurther modification and improvement of control methods, the original hardness curve of the machine is shown in the figureRed line segmentBy applying a common coefficient to the hardness correction of the entire range, the hardness curve will be raised to a state where it matches the standard hardness curve. The conclusion drawn from the experiment is that, given a common coefficient, without any interval correction24HRC, 48HRC, and 63HRCThe standard hardness block is used for hardness testing, and its hardness is different from that of the standard blockThe 24HRC error is0.9HRC，The 48HRC error is0.2HRC，The error of 63HRC is0.8HRC.

Now divide the entire hardness range intoMore than 8 hardness correction intervals, as shown in the figureBlue line segmentThis correction method refines the entire hardness range, simplifying and refining the hardness correction of electric digital hardness testers.

Technical Specifications：

Standard Configuration：