Question 1

What types of materials are Vickers hardness testers particularly suitable for measuring?

Accepted Answer

Taiwan Nakazawa answers for you: A great advantage of the Vickers hardness tester is its high precision, making it especially suitable for measuring thin and small materials. The indentation of the Vickers hardness test is square with a clear profile, and the diagonal measurement is accurate. Therefore, the Vickers hardness test has higher precision among commonly used hardness testing methods; meanwhile, its repeatability is also very good, which is superior to the Brinell hardness tester.
The measurement range of the Vickers hardness test is broad, and it can measure almost all metal materials used in industry today, from very soft materials (a few Vickers hardness units) to very hard materials (3,000 Vickers hardness units).

Our company is a firm specializing in providing metal detection and analysis instruments, producing high-quality products such as metallographic pre-processing equipment, metallographic cutting machines, metallographic mounting machines, micro-Vickers hardness testers, and Rockwell hardness testers. Welcome to Taiwan Nakazawa Co., Ltd. to make your purchase.

Question 2

What factors are unrelated to the advantages of Vickers hardness testers?

Accepted Answer

A great advantage of the Vickers hardness test is that its hardness value is independent of the magnitude of the test force. As long as the material has uniform hardness, any test force can be chosen arbitrarily, and its hardness value remains unchanged. This is equivalent to having a unified scale within a very broad hardness range. This point is superior to the Rockwell hardness test.
In the medium and low hardness value ranges, on the same uniform material, the Vickers hardness test and the Brinell hardness test results will yield approximate hardness values. For example, when the hardness value is below 400, HV≈HB. The test force of the Vickers hardness test can be as small as 10gf, and the indentation is very small, making it particularly suitable for testing thin and small materials. When measuring and testing thin and small materials, choosing a Vickers hardness tester for measurement is appropriate.

Our company, Taiwan Nakazawa Co., Ltd., specializes in the production of precision metallographic testing equipment, such as metallographic cutting machines, metallographic grinding and polishing machines, Vickers hardness testers, metallographic mounting machines, and other precision equipment. Friends in need are welcome to come and make a purchase.

Question 3

What factors affect the accuracy of a digital Rockwell hardness tester?

Accepted Answer

The digital Rockwell hardness tester is a type of Rockwell hardness tester, and it is a hardness testing instrument that adopts electromechanical integration.
Influence of the specimen itself: When the specimen material has obvious texture characteristics, the shape of the indentation will be irregular; the location of the indentation within a single grain, such as inside the grain, near the grain boundary, or near the second phase, will all influence the measured results; if the measured grain is extremely thin, the indentation will sink into the grains beneath it; for deformed specimens, attention should be paid to the longitudinal and transverse sections; even for single-phase alloys, differences in orientation from one grain to another will also reflect discrepancies.
Influence of specimen processing methods: Mechanical polishing has a significant impact on microhardness values. This is because small plastic deformations occur on the surface layer during polishing, and a very thin amorphous layer may also be generated on the surface. Therefore, the microhardness values measured by mechanical polishing are higher than those measured by electropolishing. This is even more apparent at low loads (less than 10 grams).

Our company, Taiwan Nakazawa Co., Ltd., specializes in the production of precision metallographic testing equipment, such as metallographic cutting machines, metallographic grinding and polishing machines, Vickers hardness testers, metallographic mounting machines, and other precision equipment. Friends in need are welcome to come and make a purchase.

Question 4

What kind of workpieces is the Vickers hardness tester used to test?

Accepted Answer

Taiwan Nakazawa Co., Ltd. answers for you: The Vickers hardness tester is for testing heat-treated workpieces. A test force of 0.5 ~ 100kg can be selected to test surface softened layers as thin as 0.05mm. Its precision is relatively high, and it can distinguish tiny differences in the surface hardness of workpieces. In addition, the effective hardened layer depth is also detected by the Vickers hardness tester. Therefore, for units with a large amount of surface heat treatment or usage, it is necessary to be equipped with a Vickers hardness tester for the surface treatment of workpieces.

Our company is a firm specializing in providing metal detection and analysis instruments, producing high-quality products such as metallographic pre-processing equipment, metallographic cutting machines, metallographic mounting machines, micro-Vickers hardness testers, and Rockwell hardness testers. Welcome to Taiwan Nakazawa Co., Ltd. to make your purchase.

Question 5

In what fields are micro Vickers hardness testers used?

Accepted Answer

The application fields of micro Vickers hardness testers mainly include the following aspects:
Can be used for very small components: watches, calculators, electronic components. Can be used for electroplated layers, special coatings. Can be used for the hardness of internal metal structures. Can be used for hardened surfaces of carburized layers, nitrided layers, or soft nitrided layers: surface hardness and hardness distribution of cross-sections. Can be used for the edges of knives, gears, etc. Can be used for the cross-sectional hardness distribution of welded joints: microscopic testing. Can be used for the surface and cross-sectional hardness of gold foil, thin steel plates, alloy plates, fine wires, etc. Can be used for non-metallic materials such as ceramics, glass, gemstones, tablets, bones, and dental materials. Can be used for the surface hardness of heat-treated materials.

The hardness testers produced by our company, Taiwan Nakazawa Co., Ltd., feature high precision and stable performance. We offer a complete range of specifications and models suitable for testing various products in all industries.

Question 6

What aret he testing methods for a micro Vickers hardness tester?

Accepted Answer

Micro Vickers hardness testing uses lower test loads and is suitable for micro-scale measurements.
The test method where the test load of the Vickers hardness tester is 1kgf or lower is called the micro Vickers hardness test.
The micro Vickers hardness tester is suitable for measuring various materials because its test load is much lower than other hardness [tests], and it is indispensable in fields where hardness is required.
The micro Vickers hardness tester was developed to measure hardness in various fields.

Our company, Taiwan Nakazawa Co., Ltd., specializes in the production of precision metallographic testing equipment, such as metallographic cutting machines, metallographic grinding and polishing machines, Vickers hardness testers, metallographic mounting machines, and other precision equipment. Friends in need are welcome to come and make a purchase.

Question 7

What precautions should be taken when using a Vickers hardness tester?

Accepted Answer

Taiwan Nakazawa answers for you: The Vickers hardness tester itself will produce two types of errors: one is the error caused by the deformation and movement of its parts; the other is the error caused by hardness parameters exceeding the specified standards. For the second type of error, the hardness tester must be calibrated with a standard block before measurement.
Regarding the calibration results of the Rockwell hardness tester, a difference within ±1 is qualified. For stable values with a difference within ±2, a correction value can be given. When the difference is outside the range of ±2, the hardness tester must be calibrated and repaired or another hardness testing method must be used for determination.
Each hardness scale has a de facto range of application, which should be selected correctly according to regulations. For example, when the hardness is higher than HRB100, the HRC scale should be used for testing; when the hardness is lower than HRC20, the HRB scale should be used for testing. Because when exceeding its specified testing range, the precision and sensitivity of the hardness tester are poor, the hardness values are inaccurate, and it is not suitable for use. Other hardness testing methods also stipulate corresponding calibration standards. The standard block used for calibrating the hardness tester cannot be used on both sides, because the hardness of the standard surface and the back surface is not necessarily consistent. It is generally stipulated that the standard block is valid within one year from the date of calibration.

Question 8

What precautions should be taken when measuring with a Vickers hardness tester?

Accepted Answer

Taiwan Nakazawa Co., Ltd. answers for you: When replacing the indenter or the anvil, ensure that the contact areas are wiped clean. After replacement, test several times using a steel sample of a certain hardness until the hardness values obtained twice in succession are the same. The purpose is to ensure that the contact parts of the indenter or anvil and the testing machine are tightly pressed and in good contact, so as not to affect the accuracy of the test results.
Whenever the specimen allows, generally select at least three different positions to test the hardness values and take the average value; take the average value as the hardness value of the specimen. For specimens with complex shapes, support blocks of corresponding shapes must be used, and testing can only be conducted after they are fixed. Circular specimens should generally be tested in a V-shaped groove. Before loading, check whether the loading handle is placed in the unloading position. When loading, the movement should be light and steady; do not use excessive force. After loading is completed, the loading handle should be placed in the unloading position to prevent the instrument from being under load for a long time, which could cause plastic deformation and affect measurement precision.

Question 9

How much do you know about the testing range of Rockwell hardness testers?

Accepted Answer

1. The Rockwell hardness test uses 3 types of indenters and 6 types of test forces. Depending on the range and size of metal materials and different scales of hardness, there are various choices.
2. It can test metal materials from very soft to very hard, including almost all common metal materials, and its application range is very broad.
3. Rockwell hardness testers have been widely applied in industrial production and have become a primary means of detecting product quality and determining reasonable processing techniques.
4. It can be used to test various ferrous and non-ferrous metals, and test the hardness of quenched steel, quenched and tempered steel, annealed steel, surface-hardened steel, plates, cemented carbide materials, powder metallurgy materials, and thermal spray coatings.
5. The Rockwell superficial hardness tester is used to test the hardness of plates, thin-walled tubes, surface-hardened steel, and small parts.

Our company, Taiwan Nakazawa Co., Ltd., specializes in the production of precision metallographic testing equipment, such as metallographic cutting machines, metallographic grinding and polishing machines, Vickers hardness testers, metallographic mounting machines, and other precision equipment. Friends in need are welcome to come and make a purchase.

Question 10

What is the testing principle of a micro Vickers hardness tester?

Accepted Answer

Taiwan Nakazawa Co., Ltd. answers for you:
(1) At the beginning of the measurement, the micro Vickers hardness tester presses a square pyramidal diamond indenter with an angle of 136° between opposite faces into the material surface with a loading force of 49.03 ~ 980.7N. After maintaining for a specified time, observe and measure the diagonal length of the indentation through a microscope, and then calculate the hardness value according to the formula.
(2) The automatic measurement micro Vickers hardness tester connects the microhardness tester with a computer through a CCD camera interface, and the entire testing process can be completed through simple operations of the keyboard and mouse. The measurement and control of this system are completed through high-resolution imaging devices and computer software, which increases the speed and flexibility of testing, eliminates human operational errors from the eyepiece system, and can meet various microhardness testing requirements.

Question 11

What are the applications of a micro Vickers hardness tester?

Accepted Answer

Taiwan Nakazawa answers for you:
(1) Can be used for process inspection. Micro Vickers can be used to determine the hardness of small parts, thin parts, hardened layers, and coatings. It can detect process treatment effects and research changes in material surface properties such as work hardening and friction.
(2) Can be used for metallographic and metal physics research. Micro Vickers can be used to measure the single crystals and metallographic structures of materials. In addition, by observing the shape of the indentation, the plasticity and brittleness of each constituent phase of the metal can be studied.
(3) Determination of non-metallic materials. The microhardness test is relatively suitable for the hardness determination of brittle materials such as glass, ceramics, and minerals.

Question 12

In what situations should a surface Rockwell hardness test be used instead of a Rockwell hardness test?

Accepted Answer

When encountering thinner materials, smaller specimens, shallower surface hardened layers, or when testing surface coatings, the superficial Rockwell hardness test should be used instead. In this case, by using the same indenters as the Rockwell hardness test and employing test forces of 15kg, 30kg, and 45kg, effective hardness test results can be obtained on the aforementioned specimens.

Question 13

What are the key features of Zhongzes rapid Rockwell hardness tester?

Accepted Answer

The features of our rapid Rockwell hardness tester mainly include the following points. First, it can display the hardness value within 1 second after the test is completed, greatly improving measurement efficiency. Second, it has low requirements for the workpiece surface and can measure without removing the oxide scale, making the measurement process more convenient and accurate. These features make our Rockwell hardness tester highly competitive in the market.

Question 14

What daily maintenance and upkeep should be taken into account when using Zhongze Companys metallographic mounting machine?

Accepted Answer

Daily care and maintenance are very important for the normal operation of the metallographic mounting machine. First, regularly clean the inner mold of the mounting mold; the residual mounting material must be thoroughly cleaned, and using a soft brush is relatively suitable. At the same time, pay attention to avoid being scratched by the edges of the upper and lower surfaces of the mold. Secondly, regularly clean the electromagnetic water valve. Long-term use will lead to the attachment of scale and impurities; clean regularly to prevent clogging and maintain the normal operation of the equipment. Finally, after the equipment has been used for a period of time, the interior of the machine should be cleaned regularly to thoroughly clean out impurities such as mounting materials that have fallen inside the machine, so as to avoid excessive accumulation affecting the operation of the equipment. Through the above daily care and maintenance measures, the service life of the metallographic mounting machine can be extended and work efficiency can be improved.

Question 15

What types of Rockwell hardness testers does Zhongze Company offer?

Accepted Answer

Nakazawa Company's Rockwell hardness testers come in two types, which are the analog (pointer) Rockwell hardness tester and the digital display electric Rockwell hardness tester.
The analog Rockwell hardness tester requires manual loading of the initial test force and main test force. The operation steps include the contact between the indenter and the sample, the large pointer rotating three times, and manually pressing the start button, then it will automatically load and unload. Check the pointer for the reading, and the resolution is 0.5HR.
The electric Rockwell hardness tester features automatic loading, automatic dwell, and automatic unloading functions. The operation steps include the contact between the indenter and the sample, and turning to SET will trigger automatic loading, automatic dwell, and automatic unloading. Check the display for the reading, and the resolution is 0.1HR.

Question 16

How does Zhongze Company ensure the accuracy of its microhardness tester results?

Accepted Answer

Nakazawa Company's microhardness testers have strict requirements in terms of ensuring the accuracy of test results. First, the manufacturing and calibration of the equipment both comply with national and international standards, ensuring the accuracy and reliability of the equipment. Secondly, the company regularly performs maintenance and calibration on the equipment to ensure its normal operation. In addition, Nakazawa Company also provides professional technical support and training for customers, helping them correctly use and maintain the microhardness testers, thereby ensuring the accuracy of test results.

Question 17

How does a Rockwell hardness tester work?

Accepted Answer

The Rockwell hardness tester uses an indenter to press into the surface of a specimen under a certain pressure, and determines the hardness of the specimen based on the depth to which the indenter penetrates the specimen surface. The indenters of the Rockwell hardness tester are divided into three types, which are diamond cones, steel balls, and hard alloy balls, respectively suitable for testing different materials.
The Rockwell hardness tester has 15 combinations of scales, and the appropriate scale can be selected according to different materials and testing requirements. During testing, the specimen is first placed on the workbench of the Rockwell hardness tester, then the indenter is placed onto the specimen surface. After applying pressure for a certain period, the depth of the indenter's penetration into the specimen surface is read, and the Rockwell hardness value of the specimen is obtained through a look-up table or calculation.

Question 18

What are the application areas of Zhongze Companys microhardness testers?

Accepted Answer

Nakazawa Company's microhardness testers are widely used in various fields. Among them, material research, material quality control, and surface treatment evaluation are its main application areas. In addition, it is also widely used for hardness testing of materials such as metals, non-metals, and coatings.

Question 19

In which fields are microhardness testers used?

Accepted Answer

Microhardness testers have a wide range of applications in fields such as the development, research, practical testing, and quality control of metal materials. Especially in hardness testing for special fields, such as Vickers hardness and Knoop hardness, the microhardness tester is used as an alternative performance measure for other material properties. Therefore, the microhardness tester has become one of the important instruments for testing the performance of metal materials in the machinery and metallurgy industries, and is commonly used across various industries.

Question 20

What are the characteristics of Zhongze Companys microhardness testers?

Accepted Answer

Nakazawa Company's microhardness testers feature high precision, high stability, and high ease of use. It adopts the most advanced infinity optical system, which possesses extremely high visibility and further improves measurement accuracy and repeatability, enabling it to accurately reflect the true hardness of materials.

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