سختی سنج میکرو دیجیتال Mitech MHVS-1، بر اساس این اصل که فرورفتگی الماس هرمی چهار گوش مثبت، سطح نمونه را برای ایجاد فرورفتگی فشار می دهد. با اندازه گیری طول مورب فرورفتگی، می توان اندازه گیری سختی مواد را برای اندازه گیری های کوچک انجام داد. نمونه ها، نمونه های نازک، پوشش سطح، عملیات حرارتی سطح قطعه کار تست سختی ویکرز. سیستم اندازه گیری نوری با کمک کامپیوتر، با نرخ بالا، فناوری سنسور فوتوالکتریک، نور قابل تنظیم، این محصول ارتقا یافته از نوع جهانی سختی سنج میکرو است و به طور گسترده در زمینه های پردازش فلز، صنایع الکترونیک، قطعات قالب، ساخت ساعت، بازرسی کیفیت مهندسی و غیره استفاده می شود. یک سختی سنج ایده آل برای تحقیق و آزمایش مواد است.
Function & application
Metal processing manufacturing quality control links
University education teaching demonstration experiment
Failure analysis test of metal material
Testing of material hardness of scientific research institutions
Quality inspection departments quality testing links
Working Principle
Micro-Vickers (or Knoop) hardness test principle is that put the provisions of the positive pyramid diamond indenter into the sample surface(with fixed experimental force) and maintain a certain length (holding), and then unloading. Finally, there is a positive quadrangular pyramid or kenup indentation with a square surface on the surface of the specimen. Then we can attain the area of indentation via measuring the length of the diagonal by a micrometer eyepiece. Then the corresponding Vickers (or Knoop) hardness values are obtained.
Usually Vickers hardness values can be converted according to the following formula
HV=constant×test force / indentation surface area≈0.1891 F／d2
Note:
HV, Vickers hardness symbols
F, test force
d, the arithmetic mean of of the two diagonal d1, d2
Working Conditions
Operation Temperature：18～28℃；
Relative Humidity：≤65％；
In an environment free from vibration,no corrosive medium in surrounding.
Installed on a flat basis.
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Instrument Features
Widely used in the fields of metal processing, electronics industry, mold parts, watch manufacturing, engineering quality inspection.
Adopt large-screen LCD liquid crystal display, easy to operate, visually display the test results;
Adopt high magnification optical sensing system and high precision photoelectric sensing technology, the test point positioning is accurate, the test result is more accurate;
Adjustable cold light source measurement system that can control the light strength through the software;
Equipped with high-speed thermal printer, real-time print test resultst;
Support Brinell, Vickers and other hardness units convert.
With GBT4340.1, GBT4340.2, ASTM_E92 and other relevant domestic and foreign standards.
Operating Method and Attentions
Instrument Maintenance
Read the manual carefully before using the instrument. Learn the operation steps and attentions to avoid damage the instrument or personal safety accidents caused by improper operation;
Carefully remove the shockproof tape for protecting the indenter when installed otherwise the accuracy of indenter positioning is not high.
Machine add unloading test power, it is forbidden to turn the variable load the handwheel, such as rotating dislocation can lead to internal gear, chaos test force, and even cause damage to items within the machine;
Don’t apply the test force when measuring. If not carefully press the buttonto start the test force to load, be sure to wait for the test force after the completion of the next step.
Diamond indenter and indenter are the core of the instrument, the operation should be careful not to touch the pressure head
The indenter should be kept clean when used to ensure the accuracy of the test. If the indenter is stained with oil or dust and other stains, can be used cotton with absorbent (industrial) or ether in the top of the indenter carefully wipe clean
When not in use for a long time should cover dust cover, in order to prevent dust into the machine interior, hardness block, ball head after using coated with anti-rust oil, prevent rust.
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