What is the environment in which the hardness tester is used?

The cleanliness of the environment is a common requirement for all precision electronic products, and the hardness tester is no exception, and it has higher environmental requirements than other products.

We should place the hardness tester in a dry and clean environment, away from humid places, and pay attention to indoor ventilation (preferably in smoke-free places). Since the liquid crystal panels of the hardness tester are small and have a high resolution, any fine dust particles can affect the projection effect. In addition, the hardness tester is generally cooled by a special fan with a flow rate of tens of liters of air per minute, and the high-speed air flow may carry tiny particles after passing through the filter filter.

These particles rub against each other to produce static electricity and adsorb in the heat dissipation system, which will have a certain impact on the projection screen, and at the same time, excessive dust will also affect the rotation of the cooling fan, causing the hardness tester to overheat. Therefore, we must always clean the dust filter at the air inlet. Since the liquid crystal panel is sensitive to temperature, it is necessary to ensure that the hardness tester in use is kept away from the heat source while being moisture-proof and dust-proof, so as to avoid damage to the liquid crystal panel.

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The hardness tester is used in the following environment:

1. Room temperature within the range of 10 -35; The relative humidity is not more than 80%;

2. A clean environment with no vibration, no corrosive medium and no strong electromagnetic field interference;

3. Install correctly on a solid foundation.

The above information is provided by Jinan Bojian Testing Technology ****, I hope to help you!

The hardness tester is used in an air environment with a humidity of less than 70% and a temperature of less than 80 degrees.

Look at what hardness tester, some with displacement sensor have temperature requirements.

Hardness. It's measuring.

Metal coarse brother material.

Soft and hard. Extent.

An important performance index, it can be understood as the resistance of the material to elastic deformation

Plastic deformation. or the ability to destroy, which can also be expressed as the ability of the material to resist residual deformation and anti-damage. Hardness is not a simple one.

Physics. concept, but material.

Elasticity. Plasticity, strength. And.

Toughness. Wait. Mechanical properties. Composite indicators.

Hardness tests can be divided into hydrostatic pressure methods (such as Brinell hardness, etc.) according to their different test methods

Rockwell hardness. Vickers hardness, etc.), scratch method (e.g., Mohs hardness), rebound method (e.g., shore hardness) and microhardness

High temperature. hardness and other methods.

Brinell hardness is expressed as HB[N(kgf mm2)] (HBS HBW) (refer to GB T231 1984), and the Brinell hardness method is commonly used in production to determine annealed, normalized and quenched and tempered steel, and.

Cast iron. Nonferrous metal.

Low-alloy structural steel.

and the hardness of the blank or semi-finished product.

Rockwell hardness can be divided into four types: HRA, HRB, HRC, HRD.

Measuring range. And.

Scope of application. It's also different. HRC is most used in general production.

Indentation. Smaller, can measure thinner materials and harder materials.

Finished product. piece hardness.

Vickers hardness is expressed in HV (refer to GB T4340-1999), and the sample is measured in the extreme blue stool.

The code name for hardness is H. According to the different hardness test methods, conventional.

It means Brinell (HB), Rockwell (HRC), Vickers (HV), Leeb (HL) hardness, etc., among which HB and HRC are more commonly used.

HB has a wide range of applications, and HRC is suitable for.

Surface. High hardness materials, such as heat treatment hardness, etc. The difference between the two is:

Sclerometer. The probe is different, Brinell hardness tester.

The probe is: Steel balls.

Whereas. Rockwell hardness tester.

The probe is diamond.

HV - Suitable for:

Microscope. Analyse. Vickers hardness (HV) with a load of less than 120kg.

Apex corners. 136° diamond.

Square. The cone presser is pressed into the surface of the material and indentated with the material. Pits. Target.

Surface area. Divide by the load value, which is the Vickers hardness value (HV).

HL portable hardness tester for easy measurement and impact utilization.

Ball joints. After impacting the hardness surface, a bounce is generated; The rebound velocity and impact velocity of the punch at a distance of 1 mm from the surface of the specimen are used.

Ratio. Hardness is calculated by the formula: Leeb hardness hl = 1000 VB (rebound velocity) VA (impact velocity).

Portable Leeb hardness tester can be converted into Brinell (HB), Rockwell (HRC), Vickers (HV), and Shore (HS) hardness when measured with Leeb (HL). Or use the Richter scale.

Principle. Hardness values are measured directly with Brinell (HB), Rockwell (HRC), Vickers (HV), Leeb (HL), and Shore (HS).

Summary. Hello, 1. Hardness tester distribution, Rockwell, Vickers.

2. The general measurement system refers to the BOSS Brinell measurement system and Vickers measurement system.

3. Therefore, the measurement system generally uses Brinell method and Vickers method.

4. However, there are also customers who need Rockwell hardness measurement software, but there are relatively few of them.

Common hardness testing methods.

1. Scratch hardness: choose a rod that is hard at one end and soft at the other end, scratch the measured material along the rod, and determine the softness and hardness of the tested material according to the location of the scratch.

2. Indentation hardness: press the specified indenter into the measured material with a certain load, and compare the softness and hardness of the measured material with the size of the local plastic deformation on the surface of the material.

3. Rebound hardness: make a special small hammer fall freely from a fixed height to impact the sample of the tested material, and determine the hardness of the material by the amount of strain energy stored (and then released) in the impact process of the sample (measured by the rebound height of the small hammer).

What method is used for the analysis of the measuring system of the hardness tester?

Please wait patiently for a few minutes, we are sorting it out, and we will answer you immediately, and please do not end the consultation.

Hello, 1. Hardness tester distribution, Rockwell, Vickers. 2. The general measurement system refers to the BOSS Brinell measurement system and Vickers measurement system. 3. Therefore, the measurement system generally uses Brinell method and Vickers method.

4. However, there are also customers who need Rockwell hardness measurement software, but there are fewer common hardness test methods 1. Scratch hardness: Wang Luo chooses a rod that is hard at one end and soft at the other end, and the tested material is crossed along the rod, and the softness and hardness of the tested material are determined according to the location of the scratch. 2. Xuling Yun pressed into hardness:

Press the specified indenter into the measured material with a certain load, compare the softness and hardness of the measured material with the size of the differential beam of the local plastic deformation on the surface of the material3, rebound hardness: make a special small hammer fall freely from a fixed height to impact the sample of the tested material, and determine the hardness of the material by the amount of strain energy stored (and then released) in the impact process of the sample (determined by the rebound height of the small hammer).

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In the selection of hardness meter, to combine the size of the test sample, the sample should be good to get to the machine on the bench, you can buy a desktop, not easy to move to choose portable, when you know which scale you need to test, you can directly choose the machine that directly tests this scale.

If the sample is very thin on this basis, because the test force of the HRC test is 150kg, it is easy to cause the sample to penetrate and cannot measure the real hardness value, at this time, the Vickers hardness tester will be selected to test the Vickers hardness in the conversion to HRC, and the thinnest thickness requirements of Rockwell, Brinell and Vickers samples can be found in the appendix of the national standard.

At present, there are very few HRC scales used in Rockwell hardness testers in China, so the materials suitable for testing of Rockwell machines are still relatively hard materials, such as HRB scales, which are still used in the range of 80-100HRB;

For some light metals such as copper, aluminum, lead, etc. and cast iron, Brinell hardness tester is more suitable, light metals are softer, the indentation is larger during the Brinell hardness test, and the measurement is more accurate;

For some coarse-grained metals such as cast iron, the large indentation of the Brinell hardness test can avoid the influence of coarse grains and obtain accurate measurement results, and at the same time, in the casting industry, Brinell hardness can be converted to obtain the tensile strength of the material;

Vickers hardness covers almost all materials from very soft to very hard, and is a universal hardness tester and the most widely used hardness tester at present.

The purpose of a hardness tester is why you want to measure the hardness of a material or product. The hardness of the test product is mainly to ensure the quality of the product produced, and to make it meet a certain national standard through testing, so that the product can be recognized and sold. It is of great significance for production enterprises to measure the hardness reaction in the production process of product quality, to distinguish defective products and qualified products, and to improve and improve the pass rate of products through testing.

Other than that. It will also be used by various science and technology research institutes. Let's directly study the use and significance of hardness in various fields.

Hardness testing can become one of the most commonly used methods in mechanical property testing, because the results can sensitively reflect the differences in chemical percentage, microstructure and treatment process of materials under certain conditions. This method is widely used in the inspection of raw materials, the supervision of the correctness of the heat treatment process, and in the study of solid-state phase transformation processes and the study of new materials and alloys.

In China's machinery manufacturing industry, hardness testing is often used to check the effect of final heat treatment. In fact, hardness testing is also a very important means for quality control in process management and production processes. For example, for some productions that have not been heat treated, in order to avoid mixing and wrong materials, hardness testing should be carried out.

In the machining process, in order to avoid the performance change caused by annealing caused by excessive cutting or grinding work, hardness testing should also be used. Therefore, the scientific and reasonable application of hardness testing methods is worth paying attention to.

Since there is a certain correspondence between metal hardness and strength, hardness testing has a wider practical significance.

1. Brinell hardness tester is mainly used to determine the Brinell hardness of ferrous metals, non-ferrous metals and bearing alloy materials.

2. The Rockwell hardness tester adopts the Rockwell measurement principle, which can directly measure the Rockwell hardness. It is suitable for Rockwell hardness testing of cemented carbide, carbon steel, alloy steel, cast iron, non-ferrous metals and other materials. It can be widely used in metal detection, scientific research and production in computing, machinery manufacturing, metallurgy, construction and other industries.

The implementation standards are: GB metal Rockwell hardness test Part 2: inspection and calibration of hardness tester (A, B, C, D, E, F, G, H, K, N, T scale), European standard BSN10109-96 "Hardness test of metal materials", international standard metal materials - Rockwell hardness test - inspection and standard of hardness tester.

3. Vickers hardness tester is used for heat treatment, carbonization, quenching hardening layer, surface cladding, steel, non-ferrous metals, micro and thin parts, etc.

Hardness, which is the ability to resist deformation, is an important parameter that reflects the physical properties of the material to be measured.

Measure the hardness of the material, according to the composition of the material generally Vickers, Brinell, Rockwell, Knoop and other hardness testers, each hardness value and tensile strength has a certain relationship, but only an approximate relationship

There are many kinds of hardness testers, and the principles are different

1. Rockwell hardness tester: the lever is the original theory, measuring the depth of the indentation 2. Brucelle hardness tester: measuring the diameter of the indentation.

3. Vickers hardness tester: measure the length of the diamond indentation diagonal.

4. Leeb hardness tester: spring impact principle.

According to the situation of our engineering institute, it is recommended to choose a reliable quality Wowe brand hardness tester, such as:

1. Rockwell hardness tester: RDT700

2. Brinell hardness tester: WHB-3000

3. Vickers hardness tester: VTD532; VTD5524, Leeb hardness tester: W380L

5. Microhardness tester: VTD512

To put it simply, HRC diamond cone is pressed into the metal surface, the pressure is relieved after a specified holding time, and then the depth of the indentation is measured to calculate the hardness.

The working principle and operation of the pendulum hardness tester are the same.