دستگاه سختی سنج میکرو تارنت خودکار MHV-1Z

سختی سنج میکرو تارنت خودکار Mitech MHV-1Z، بر اساس این اصل که فرورفتگی الماس هرمی چهار گوش مثبت، سطح نمونه را فشار می دهد تا فرورفتگی ایجاد شود. با اندازه گیری طول مورب فرورفتگی، می توان سختی مواد را اندازه گیری کرد. برای نمونه های کوچک، نمونه های نازک، پوشش سطح، عملیات حرارتی سطح قطعه کار تست سختی ویکرز. با عملکرد پایدار، ساختار قوی، قابلیت اطمینان بالا، عملکرد ساده، اتخاذ سیستم اندازه گیری نوری با بزرگنمایی بالا، تنظیم منبع نور سرد، فناوری سنجش فوتوالکتریک و به کمک رایانه به این معنی است که عملکرد قدرتمندی دارد. به طور گسترده ای 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.

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.

Installed on a flat basis.

Instrument Features
Widely used in micro-specimen, thin specimen, surface coating, heat treatment of workpiece surface samples and etc.Vickers hardness test to meet different demands of scientific research institutions, precision machining and quality inspection departments and other materials research;

Adopt automatic turret device, can be self-conversion indenter and microscopic eyepiece, high efficiency;

Using a unique indentation measurement conversion and microscopic eyepiece a measurement of reading institutions, built-in hardness value conversion table, easy to use;

Innovative, rugged construction, high reliability, easy to operation, intuitive reading, high efficiency;

Equipped with high-speed thermal printer, real-time print test results;

 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;

Adopt diamond indenter, durable and accurate;

Adjustable cold light source measurement system that can control the light strength through the software;

Optional photographic device, can be achieved on the measured indentation and material microstructure to shoot for later analysis;

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;

The instrument should be carried at the bottom of the handling, to prohibit cross. Before loading, please unplug the power plug, fixed measuring lever and remove the weight and boom;

Carefully remove the shockproof tape for protecting the indenter when installed otherwise the accuracy of indenter positioning is not high;

The surface of the test piece should be smooth, no dirt, scale, pits and significant processing traces;

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;

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;

After a long idle time, the electrical components should be preheated before testing

Conducted at least once a year instrument verification, to ensure the accuracy of the hardness tester

When replacing the fuse or removing the weight, turn off the power first.