Product Features
● Compliant with ASTM E18 standard ASTM E384、ISO 6508、GB/T230；
The rack structure is sturdy and has good rigidity;
● Fully automatic closed-loop sensor loading;
Can test 15 Rockwell and 15 surface Rockwell hardness scales;
High precision, international contrast less than 0.5HR;
● High speed step control, extremely fast testing speed;
● Unique foot switch design (optional), automatic lifting of the large platform as a whole, saving manpower, and one click automatic measurement;
High precision loading system effectively avoids force overload and greatly improves loading speed;
● Testing process curve display, which can intuitively display material properties, facilitating observation and learning;
● Continuous measurement can be carried out on the fixed workbench through the automatic retraction function of the pressure head;
The automatic lifting platform and automatic load initial test force can ensure stable force generation;
● High definition LCD, touch screen operation, menu based operation interface;
● Automatic loading and unloading, with adjustable holding time;
● GO/NG tolerance judgment;
Correction of test values for cylinders and spheres;
● Linkage between force measurement selection and hardness scale selection;
● Ruler conversion HR HB、HV ；
● Built in printer;

Product Enhancement
Fully automatic high-speed response closed-loop sensor loading system, with the large platform moving as a whole, achieving high-precision and rapid testing to improve the control accuracy of the actuator
The original system belongs to millisecond level control system. Unable to achieve step control.
The new system belongs to microsecond level control system. It can achieve high-speed step control.
The step control accuracy can reach nanometer level!

Product Enhancement
Fully automatic high-speed response closed-loop sensor loading system, with the large platform moving as a whole, achieving high-precision and rapid testing to improve the control accuracy of the actuator
The original system belongs to millisecond level control system. Unable to achieve step control.
The new 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 the 'eyes'
2. Improve the ability to process overall digital signals. Replace the 'core'
3. Improve the accuracy of displacement measurement. Change the 'ears'
4. Improve the accuracy of motor control. Change hands
5. Improve the human-machine interface. Change the 'face'

Set up a dedicated management device QEI for displacement sensors
The original motherboard does not have a dedicated management device, and the CPU must continuously handle the displacement sensor signals personally throughout the entire loading process.
After setting up a dedicated management device, the CPU only needs to read data at the start and end time points. During the loading process, the CPU can concentrate resources on managing force sensors and loading 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 reach over 150 million cycles.
The traditional electric loading Rockwell hardness tester has a slow loading process. If the loading speed is to be controlled within 8 seconds as required by the national standard GBT230/T-91, there will be a phenomenon of continuous overshoot and removal of the red curve in the test force F to approach it, as shown in the figure. 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 a more advanced and applicable central processing chip, which responds to the entire hardness test process at high speed. From the start to the end of each hardness test, the central processing chip will process 18000 to 30000 sets of data at ultra-high speed. Shorten the loading action that traditional electric hardness testers require 8 seconds to 1.75 seconds (ISO6508-1:99 standardizes the test force application time within 1-8s). 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.

1. Force value and depth curve.
During the operation of the hardness tester, the main chip reads real-time data from the pressure sensor and displacement sensor, and converts the data into curves. The curve in the figure shows the force value and depth curve of the 28.3HRC hardness block.

2. Pressure depth curve
Export synchronized data of pressure and pressure depth during the detection process, automatically generate pressure depth curves, and determine the shaded area for research on elastic modulus, etc. The vertical axis in the figure represents pressure, and the horizontal axis represents depth

The standard hardness curve is a straight line, as shown by the black line segment in the figure. Accurate hardness correction
The automatic hardness correction of traditional electric digital hardness testers is shown in the yellow line segment in the figure. The 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.
After further modification and improvement of the control method, the original hardness curve of the machine is shown as the red line segment in the figure. By applying a common coefficient to the hardness correction of the entire range, the hardness curve will be raised to a state that matches the standard hardness curve. The conclusion drawn from the experiment is that without any interval correction given a common coefficient, hardness tests were conducted on 24HRC, 48HRC, and 63HRC standard hardness blocks, with an error of 0.9HRC for 24HRC, 0.2HRC for 48HRC, and 0.8HRC for 63HRC, respectively.
Now divide the entire hardness range into 8 or more hardness correction intervals, as shown in the blue line segment in the figure. This correction method refines the entire hardness range, simplifying and refining the hardness correction of the electric digital hardness tester.
Experimental data: The highest accuracy of hardness testing reaches a positive and negative deviation of ≤ 0.15HRC

technical parameter

Standard configuration