Kodi kuumitsa padziko?

Kuzimitsa pamwamba ndi kutentha kutentha kutentha nthawi zambiri kumachitika ndi kutentha kwa induction kapena kutentha kwa lawi. Waukulu luso magawo ndi pamwamba kuuma, m`deralo kuuma ndi ogwira anaumitsa wosanjikiza kuya. Kuyesa kuuma kumatha kugwiritsa ntchito Vickers hardness tester, Rockwell kapena Rockwell hardness tester ingagwiritsidwenso ntchito. Kusankhidwa kwa mphamvu yoyesera (mulingo) kumagwirizana ndi kuya kwake kolimba kolimba komanso kuuma kwa pamwamba kwa workpiece. Pali mitundu itatu ya oyesa kuuma omwe akukhudzidwa apa.

1. Vickers hardness tester ndi njira yofunikira yoyesera kuuma kwa pamwamba pa ntchito zotenthetsera kutentha. Itha kusankha mphamvu yoyesera ya 0.5-100kg kuyesa mawonekedwe owumitsidwa pamtunda woonda ngati 0.05mm. Kulondola kwake ndikwapamwamba kwambiri ndipo kumatha kusiyanitsa pamwamba pa ntchito yotenthetsera kutentha. Kusiyana kwakung’ono pakuuma. Kuphatikiza apo, kuzama kolimba kolimba kuyeneranso kuzindikirika ndi Vickers hardness tester. Chifukwa chake, ndikofunikira kukonzekeretsa Vickers hardness tester pamayunitsi omwe amagwira ntchito yochizira kutentha kapena kugwiritsa ntchito zida zambiri zochitira kutentha pamwamba.

2. The pamwamba Rockwell kuuma Tester ndi oyeneranso kwambiri kuyesa kuuma pamwamba kuzimitsidwa workpieces. Rockwell hardness tester ili ndi masikelo atatu oti musankhe. Itha kuyesa ma workpieces osiyanasiyana olimba omwe kuuma kwawo kumapitilira 0.1mm. Ngakhale kuti kulondola kwapamwamba kwa Rockwell hardness tester sikuli kofanana ndi kuyesa kwa Vickers hardness tester, yatha kukwaniritsa zofunikira monga njira yoyendetsera bwino komanso kufufuza koyenerera kwa zomera zochizira kutentha. Kuphatikiza apo, ilinso ndi mawonekedwe osavuta kugwiritsa ntchito, kugwiritsa ntchito bwino, mtengo wotsika, kuyeza mwachangu, komanso kuwerenga molunjika za mtengo wowuma. Rockwell hardness tester imatha kuyesa mwachangu komanso mosawononga magulu azinthu zothira kutentha. Izi ndizofunikira kwambiri pakupanga zitsulo ndi mafakitale opanga makina.

3. Pamene pamwamba kutentha mankhwala anaumitsa wosanjikiza ndi wandiweyani, Rockwell kuuma tester angagwiritsidwenso ntchito. Pamene makulidwe a wosanjikiza wotenthedwa ndi kutentha ali pakati pa 0.4 ndi 0.8mm, sikelo ya HRA ingagwiritsidwe ntchito, ndipo makulidwe a wosanjikiza owumawo akapitilira 0.8mm, sikelo ya HRC ingagwiritsidwe ntchito.

Miyezo itatu yowuma ya Vickers, Rockwell ndi Surface Rockwell imatha kusinthidwa mosavuta kukhala wina ndi mnzake ndikusinthidwa kukhala mfundo zowuma zomwe zimafunikira pamiyezo, zojambula kapena ogwiritsa ntchito. Kutembenuka kofananirako kwaperekedwa mu standard standard ISO, American standard ASTM ndi Chinese standard GB/T.