Hardness Tester/Dietmar Leeb/Rockwell Hardness Tester

• Certification: CE, FDA, EEC, ISO13485
• LCD Display: Without LCD Display
• Ultra High Temperature Alarm: Ultra High Temperature Alarm
• Sterilization Information Recording and Printing: Without Sterilization Information Recording and Printing
• Two Kinds of Errors: Deformation,Movement and Parameter Exceeding The S
• Transport Package: Cartons or Wood Case
• Model NO.: RAY-LH120#
• Trademark: Raytek
• Origin: China
• HS Code: 9002909090
• Production Capacity: 10000 Set Per Year

Product Description

Product Description:Hardness tester is a kind of hardness testing instrument. The metal hardness measurement was first defined by Raoul, which represents the ability of materials to resist hard objects pressing into their surfaces. It is one of the important performance indexes of metal materials. Generally, the higher the hardness, the better the wear resistance.

Hardness test is the most simple and easy test method in mechanical property test. In order to replace some mechanical property tests with hardness tests, a more accurate conversion relationship between hardness and strength is needed in production.

1. Leeb hardness is designed based on the latest Leeb hardness testing principle and the most advanced microprocessor technology.

2. Brinell hardness (HB) Press a hardened steel ball of a certain size (generally 10mm in diameter) into the material surface with a certain load (generally 3000kg) for a period of time. After unloading, the ratio of the load to the indentation area is the Brinell hardness value (HB), and the unit is kilogram force/mm2 (N/mm2).

3. Rockwell hardness (HR) When HB>450 or the sample is too small, Rockwell hardness measurement shall be used instead of Brinell hardness test. It uses a diamond cone with a vertex angle of 120 ° or a steel ball with a diameter of 1.59 and 3.18 mm to press it into the surface of the tested material under a certain load, and the hardness of the material is calculated from the depth of the indentation. According to different hardness of test materials, there are three different situations:

HRA: the hardness obtained by using 60kg load and diamond cone indenter, used for materials with extremely high hardness (such as cemented carbide).
HRB: hardness obtained by using 100kg load and 1.58mm diameter hardened steel ball, used for materials with low hardness (such as annealed steel, cast iron, etc.).
HRC: the hardness obtained by using a 150kg load and a diamond cone indenter, used for materials with high hardness (such as quenched steel).

4. Vickers hardness (HV) is pressed into the material surface with a load within 120kg and a diamond square cone indenter with a top angle of 136 °. The Vickers hardness value (HV) is obtained by dividing the load value by the surface area of the material indentation dent.

5 Knoop hardness (HK) is applicable to the hardness test of high hardness materials (generally the hardness measurement above HV1000).

6. There is also a Shore hardness tester.

7. The Vickers hardness tester (HW) is applicable to the measurement of the Vickers hardness value of aluminum alloy products.

8 Gypsum hardness tester is applicable to the measurement of the hardness of building gypsum. Place the steel ball on the test piece, measure the depth of the ball mark under the fixed load, and calculate the gypsum hardness of the test piece.

The above hardness is only commonly used. In addition, there are Shore (HS) hardness, Shore (HS) hardness, Babbitt hardness, Mohs hardness, etc. Practice has proved that there is an approximate corresponding relationship between hardness values and strength values of metal materials. Because the hardness value is determined by the initial plastic deformation resistance and the continuous plastic deformation resistance, the higher the strength of the material, the higher the plastic deformation resistance, and the higher the hardness value.

Product precautions:
1. The hardness tester itself will produce two kinds of errors: one is the error caused by the deformation and movement of its parts; The second is the error caused by the hardness parameter exceeding the specified standard. For the second error, calibrate the hardness tester with a standard block before measurement. The calibration result of Rockwell hardness tester shall be qualified if the difference is within ± 1. If the difference is within ± 2, a correction value can be given. If the difference is beyond ± 2, the hardness tester must be calibrated and repaired or tested by other hardness testing methods.

Each scale of Rockwell hardness has a practical application range, which should be selected correctly according to the regulations. For example, when the hardness is higher than HRB100, HRC scale shall be used for testing; When the hardness is lower than HRC20, the HRB scale shall be used for testing. Because the precision and sensitivity of the hardness tester are poor and the hardness value is inaccurate when it exceeds the specified test range, it should not be used. Other hardness testing methods also have corresponding calibration standards. The standard block used to calibrate the hardness tester cannot be used on both sides, because the hardness of the standard surface and the back surface may not be the same.

2. When replacing the indenter or anvil, pay attention to wiping the contact parts. After replacement, steel samples with a certain hardness shall be tested several times until the hardness values obtained for two consecutive times are the same. The purpose is to make the contact part between the indenter or anvil and the testing machine compact and have a good contact, so as not to affect the accuracy of the test results.

3. After the hardness tester is adjusted, the first test point is not used when measuring the hardness. The measured value is not accurate because the sample may not contact the anvil well. After the first point of test is completed and the hardness tester is in the normal operating mechanism state, the sample shall be formally tested and the measured hardness value shall be recorded.

4. If the test piece allows, at least three hardness values shall be tested at different parts, and the average value shall be taken as the hardness value of the test piece.

5. For test pieces with complex shapes, cushion blocks with corresponding shapes shall be used and fixed before testing. The round test piece shall be tested in the V-shaped groove.

6. Before loading, check whether the loading handle is placed in the unloading position. When loading, the action should be light and steady, and the force should not be too strong. After loading, the loading handle shall be placed at the unloading position to prevent the instrument from being under load for a long time, causing plastic deformation and affecting the measurement accuracy.
Main Cooperation Materials Manufacturers:
CORNING, OHARA, SCHOTT, LEONI, AGC,HELLMA, NIKON,VITRON,C-LASER,ETC

Main Export Countries & Areas:
Usa, Uk, Japan, Germany, Spain, France, Swiss, Korea, Russia, Pakistan, India, Portugal, Canada, New Zealand, Australia, Saudi Arab, Turkey, Finland, Poland ,etc.

Raytekoptics Extra value added services offered:
1). Optical workcraft & process solution design;
2). Rough processing raw materials;
3). Semi finishing raw materials;
4). Fabricate custom sizes and shapes;
5). Design and supply custom coatings;
6). Modify and resurface customer supplied materials;
7). Drill holes, notch glass and provide beveled substrates;
8). Precision polish optics with non-standard aspect ratios;

Payment Method: by T/T or Western Union.
Delivery time: 7-10 days.
Quality Warranty: Ruitaiphotoelectric(Raytekoptics) offers quality warranty for our optics products with "3R" policy. For any inferior-quality products, Ruitaiphotoelectric(Raytekoptics) is responsible for return, replacement and refund.