1、 Product Introduction

The convex nose full Rockwell hardness tester HRS-150/45X is a desktop Rockwell hardness tester that uses the Rockwell measurement principle for hardness testing of materials such as carbon steel, alloy steel, cast iron, non-ferrous metals, and engineering plastics. It adopts internationally advanced closed-loop sensor control technology 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 full microsecond level tracking and control of the force application process. Widely used in testing, scientific research, and production in industries such as metrology, mechanical manufacturing, metallurgy, chemical engineering, and building materials.

2、 Functional Features

●High testing accuracy and wide measurement range;

●Upper and lower limit settings, over tolerance alarm;

●Surface correction, automatic correction of cylindrical and spherical measurement results;

●The specially designed indenter extends horizontally and can measure parts such as rings and tubes that cannot be measured by ordinary hardness testers, with a minimum test inner diameter of 40mm;

●Easy to operate, available in any language version;

●Ready to use upon startup, no need to install weights, no need for installation and debugging;

●Electric loading, closed-loop control;

●Automatic correction of experimental force, increasing the accuracy of force values by an order of magnitude

●All Rockwell scales have automatic correction for high, medium, and low hardness values

●Set password protection settings parameters; Maintain more samples and experimental information

● Adopting a modular design for easy maintenance

3、 Product Enhancement

Fully automatic high-speed response closed-loop sensor loading system, 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

Set up a dedicated management device for displacement sensorsQEI

The original motherboard does not have a dedicated management device,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 beginning and end of two time points. During the loading process, the CPU can centralize resource management of 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. Less affected by the environment. The lifespan can reachMore than 150 million times.

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, causing the testing time to be too long; 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.

Curve Explanation

1. Force value and 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 isThe force value and depth curve of 28.3HRC 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.

pictureThe vertical axis in the figure represents pressure, and the horizontal axis represents depth

Accurate hardness correction

The standard hardness curve is a straight line, as shown in the figureblack lineparagraph.

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.

pass throughFurther transformation and improvement of the "Fangyuan" control method, the original hardness curve of the machine is shown in the red line segment in the figureBy 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 block24HRC error is 0.9HRC，48HRC error is 0.2HRC，The error of 63HRC is 0.8HRC.

Now divide the entire hardness range intoMore than 8 hardness correction intervals, as shown in the blue line segment in the figure, this correction method refines the entire hardness interval and simplifies and refines the hardness correction of the electric digital hardness tester.

Experimental data: The highest hardness accuracy achieved during testing≤0.15HRCThe positive and negative deviation!

Technical Parameter

Standard configuration