1、在使用儀器前應(yīng)仔細(xì)閱讀使用說(shuō)明書(shū)，詳細(xì)了解儀器操作步驟及使用注意事項(xiàng)，避免由于使用不當(dāng)而造成儀器損壞。
2、儀器電器元件、開(kāi)關(guān)、插座安裝位置嚴(yán)禁自行拆裝，如果擅自拆裝將可能出錯(cuò)而引發(fā)安全事故。
3、本儀器試驗(yàn)力在加載或試驗(yàn)力未卸除的情況下，嚴(yán)禁轉(zhuǎn)動(dòng)壓頭，否則會(huì)造成儀器損壞。只能等試驗(yàn)力卸除后主屏幕回到操作界面時(shí)，才能轉(zhuǎn)動(dòng)壓頭。
4、儀器在測(cè)量狀態(tài)下，請(qǐng)不要施加試驗(yàn)力，如不小心按啟動(dòng)鍵，這時(shí)不能轉(zhuǎn)動(dòng)壓頭，只有等待試驗(yàn)力施加完畢后，才能轉(zhuǎn)動(dòng)壓頭。
5、金剛石壓頭
1)壓頭和壓頭軸是儀器非常重要的部分，因此在操作時(shí)要十分小心不能觸及壓頭。2)為了保證測(cè)試精度，壓頭應(yīng)保證清潔，當(dāng)沾上了油污或灰塵時(shí)可用脫脂綿沾上酒精
(工業(yè)用）或乙醚，在壓頭頂尖處小心輕擦干凈。
6、目鏡
1)由于各人眼睛的視差，觀察目鏡視場(chǎng)內(nèi)的刻線可能模糊，因此觀察者換人時(shí)，應(yīng)先微量轉(zhuǎn)動(dòng)目鏡上的眼罩(8)，使觀察到視場(chǎng)內(nèi)的刻線清晰。
2)目鏡插在目鏡管內(nèi)，要注意應(yīng)插到底，不能留有間隙，否則會(huì)影響到測(cè)量的準(zhǔn)確度，當(dāng)測(cè)量壓痕對(duì)角線時(shí)，須測(cè)量其頂點(diǎn)，然后轉(zhuǎn)90°再測(cè)量另一對(duì)頂點(diǎn)。
7、試樣
1)試樣表面必需清潔，如果表面沾有油脂和污物，則會(huì)影響測(cè)量準(zhǔn)確性。在清潔試樣時(shí)，可用酒精或乙醚抹擦。
2)當(dāng)試樣為細(xì)絲、薄片或小件時(shí)，可分別用細(xì)絲夾持臺(tái)、薄片夾持臺(tái)及平口夾持臺(tái)夾持，放在十字試臺(tái)上進(jìn)行測(cè)試如果試件很小無(wú)法夾持，則將試件鑲嵌拋光后再進(jìn)行試驗(yàn)。
8、努普硬度的測(cè)定
1)換壓頭
用螺絲刀將壓頭(5)的固定螺釘旋松，取下壓頭，換上努普壓頭。裝的時(shí)候認(rèn)好方向，壓頭的紅點(diǎn)朝前，應(yīng)使長(zhǎng)棱線與試臺(tái)平行。在裝上努普壓頭后可能要調(diào)整一下中心。
2）硬度測(cè)定
硬度測(cè)定方法與維氏基本相同，而努普硬度只需測(cè)定長(zhǎng)的對(duì)角線即可，然后按數(shù)字鍵確認(rèn)，HK硬度值就可在顯示屏上顯示。
9、經(jīng)驗(yàn)參考
在測(cè)量維氏硬度時(shí)，只要試件條件允許，盡量使用大試驗(yàn)力，測(cè)量相對(duì)比較準(zhǔn)確。一般是硬材料用較大的試驗(yàn)力;軟材料用較小的試驗(yàn)力。
按照我們的習(xí)慣,壓痕對(duì)角線長(zhǎng)度在50um左右時(shí)測(cè)量最方便,但也要考慮材料的厚度。
參考:材料厚度≥1.5×壓痕對(duì)角線長(zhǎng)度
比如:材料厚度=0.1mm，則壓痕對(duì)角線長(zhǎng)度不能大于0.066mm。這就滿足:0.1≥1.5×0.066。
英斯特力儀器是一家集研發(fā)、生產(chǎn)及銷售于一體的 影像測(cè)量?jī)x，拉力試驗(yàn)機(jī), 硬度計(jì) ,探傷儀, 粗糙度儀, 測(cè)厚儀, 金相設(shè)備廠家, 致力于為客戶提供更好的檢測(cè)儀器。
1. Before using the instrument, read the instruction manual carefully, understand the operation steps and precautions of the instrument in detail, and avoid the damage of the instrument due to improper use.
2. The installation position of instrument electrical components, switches and sockets is strictly forbidden to disassemble and assemble by themselves. If they are disassembled without authorization, they may make mistakes and cause safety accidents.
3, the instrument test force in the loading or test force is not removed, it is strictly prohibited to turn the head, otherwise it will cause damage to the instrument. The head can only be rotated when the main screen returns to the operating interface after the test force is removed.
4, the instrument in the measurement state, please do not apply test force, such as accidentally press the start button, then can not rotate the head, only wait for the test force is applied, can rotate the head.
5, diamond head
1) The head and the head shaft are very important parts of the instrument, so be very careful not to touch the head during operation. 2) In order to ensure the accuracy of the test, the head should be clean, when stained with oil or dust can be degreased cotton dipped in alcohol
(for industrial use) or ethyl ether, wipe carefully at the top of the indenter.
6, the eyepiece
1) Due to the parallax of each person's eyes, the lines in the field of view of the observation eyepiece may be blurred. Therefore, when changing the observer, the eye mask on the eyepiece should be rotated slightly first (8) to make the lines in the field clear.
2) When the eyepiece is inserted into the eyepiece tube, it should be noted that the eyepiece should be inserted to the end without leaving a gap, otherwise the accuracy of measurement will be affected. When measuring the indentation diagonal, the vertex must be measured, and then turn 90° to measure another pair of vertices.
7, sample
1) The sample surface must be clean, if the surface is stained with grease and dirt, it will affect the accuracy of measurement. When cleaning the sample, rub it with alcohol or ether.
2) when the sample is filaments, thin slices or small pieces, the filaments, thin slices and flat mouth clamps can be respectively clamped on the cross test table for testing if the specimen is too small to be clamped, the specimen is inlaid and polished before the test.
8. Determination of Knoop hardness
1) for head
Loosen the fixing screw of the pressure head (5) with a screwdriver, remove the pressure head, and replace the noop pressure head. When loading, recognize the direction, the red point of the pressure head forward, should make the long prism parallel to the test table. It may be necessary to adjust the center after installing the noop head.
2) Hardness test
The hardness measurement method is basically the same as vickers, and the knoop hardness only needs to measure the long diagonal line, and then press the number key to confirm, THE HK hardness value can be displayed on the screen.
9. Experience reference
In the measurement of Vickers hardness, as long as the specimen conditions allow, try to use large test force, the measurement is relatively accurate. Generally hard materials with a larger test force; Soft materials with less testing force.
According to our habit, the indentation diagonal length in about 50um when the most convenient measurement, but also to consider the thickness of the material.
Reference: Material thickness ≥1.5 x indentation diagonal length
For example: material thickness =0.1mm, the indentation diagonal length can not be greater than 0.066mm. This satisfies :0.1≥1.5×0.066.
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