Kodi zifukwa zazikulu zomwe zimakhudza mapindikidwe a Kuthetsa pafupipafupi?

Zinthu zomwe zimakhudza kusinthika kwa kutentha kwapamwamba kwambiri kumaphatikizapo mapangidwe oyambirira a zitsulo, carbon content, kukula ndi mawonekedwe a zigawozo, kusankha kwa sing’anga yozimitsa, njira yozimitsa, ndi kuuma kwachitsulo.

1. Zotsatira za carbon zili mu zitsulo pa mapindikidwe a ziwalo pa quenching kutentha mankhwala. Zitsulo zapakatikati komanso zazitali za kaboni zimatha kusweka panthawi yozimitsa kutentha kwambiri. Pofuna kuyika ma deformation ndi kusweka, zitsulo za hypereutectoid nthawi zambiri zimagwiritsa ntchito quenching yosakwanira kuti ipeze cryptocrystalline martensite, yomwe si yosavuta kupanga microcracks. .

2. Kuuma kwachitsulo kumakhalanso ndi chikoka pa mapindikidwe a zigawo panthawi yozimitsa chithandizo cha kutentha. Kuuma kwachitsulo kumagwirizana kwambiri ndi kuzizira kwakukulu kwachitsulo. Kutsika kozizira kozizira kwambiri, kumapangitsanso kuuma kwachitsulo. Chinthu chachikulu chochepetsera kuzizira kwambiri ndi mankhwala achitsulo. Chitsulo chokhala ndi kuuma bwino chimatha kugwiritsa ntchito njira yozimitsira pang’onopang’ono pakuzimitsa ndi kuziziritsa kuti muchepetse kupindika ndi chizolowezi chophwanyidwa cha workpiece pakuzimitsa. Choncho, pazigawo zofunika zokhala ndi maonekedwe ovuta komanso zigawo zazikulu, kuuma kwabwino kuyenera kusankhidwa. aloyi chitsulo. Pambuyo potumikira ndi kutentha, zofunikira zamakina zimatha kupezeka ndipo mapindikidwe ndi ming’alu akhoza kuchepetsedwa.

3. Chikoka cha mapangidwe oyambirira a zitsulo pazitsulo zozimitsa za zigawozo. Ma microstructure a ziwalo zozimitsidwa ali ndi chikoka chachikulu pa kuzimitsa khalidwe la zigawo. Mwachitsanzo, aloyi zitsulo, kubala zitsulo, etc. ayenera spheroidized annealed pambuyo forging. Pa kuzimitsidwa ndi kutentha, mbewu za austenite sizosavuta kukula. The mapindikidwe ndi ang’onoang’ono workpiece ndi ang’onoang’ono, bwino mkati njere kukula zakuthupi, apamwamba zokolola mphamvu, ndi kukana kwambiri mapindikidwe, ndi mapindikidwe workpiece pambuyo kuzimitsidwa ndi chimodzimodzi yafupika.

1. Zotsatira za quenching sing’anga pa mapindikidwe a mbali pa quenching kutentha mankhwala. Nthawi zambiri amakhulupirira kuti chikoka cha kuzizira kwa sing’anga yozimitsa pa 300 ° C pa deformation ndiye chinsinsi, ndipo sing’anga yozimitsa iyenera kusankhidwa moyenerera malinga ndi kuuma kwa chitsulo, kukula kwa gawolo. ndi pamwamba roughness, ndi geometric mawonekedwe a gawo amakhudza quenching mapindikidwe gawo. , Kuchokera pakuwona ndondomeko ya kutentha kwa kutentha, mawonekedwe a gawolo ndi bwino kugwiritsa ntchito mawonekedwe osakanikirana, woyang’anira amapewa ngodya zakuthwa, ndipo amafuna gawo lofanana kwambiri. Pakafunika, poyambira ndondomeko akhoza kutsegulidwa. Chifukwa chake, zida ziyenera kusankhidwa moyenera kuti zisathe kuzimitsa ming’alu.