Machinery yana nufin gaba ɗaya sunan injina da ƙungiya.Na'ura kayan aiki ne ko na'urar da ke sauƙaƙa aiki ko ƙarancin ceton aiki.Abubuwa kamar sara, tsintsiya, da tweezers duk ana iya kiransu inji.Su ne injuna masu sauƙi.Injunan hadaddun sun ƙunshi nau'ikan injuna masu sauƙi biyu ko fiye.Waɗannan injunan da suka fi rikitarwa galibi ana kiran su inji.Daga mahangar tsari da motsi, babu bambanci tsakanin cibiyoyi da injuna, gabaɗaya ana kiransu da injina.

Injin, wanda aka samo daga Mechine na Girkanci da Latin Machina, asalin suna nufin "ƙira mai wayo", a matsayin babban ra'ayi na injuna, ana iya samo su zuwa zamanin d ¯ a na Roman, musamman don bambanta daga kayan aikin hannu.Kalmar Sinanci ta zamani "injuna" kalma ce ta gaba ɗaya don injinan Ingilishi da na'ura.Siffofin injina su ne: injina haɗe ne na kayan aikin wucin gadi.Akwai takamaiman motsi na dangi tsakanin sassan injin.Don haka, Injin na iya canza makamashin injina ko cikakken aikin injiniya mai amfani, wanda shine mafi mahimmancin ra'ayi a cikin ka'idodin injinan zamani.Tunanin zamani na injinan Sinawa an samo su ne daga kalmar "injuna" a cikin Jafananci.An bayyana manufar injuna a cikin kayan aikin Jafananci kamar haka (wanda ya dace da halaye uku masu zuwa, wanda ake kira Injin inji).

Mechanical asali sassa (yafi: bearings, gears, molds, na'ura mai aiki da karfin ruwa sassa, pneumatic aka gyara, like, fasteners, da dai sauransu) wani makawa sashe ne na kayan aiki masana'antu masana'antu, wanda kai tsaye kayyade yi, matakin, inganci da amincin manyan kayan aiki da kuma samfurori masu masaukin baki, kuma shine mabuɗin don gane canjin masana'antar kera kayan aiki daga babba zuwa ƙarfi.

Machining na inji sassa wani tsari ne a cikin abin da siffar size ko aiki na workpiece canza ta inji inji.Dangane da yanayin zafin jiki na workpiece, an raba shi zuwa sarrafa sanyi da aiki mai zafi.Gabaɗaya a sarrafa zafin jiki, kuma baya haifar da sassan sinadarai na workpiece ko canje-canjen lokaci da ake kira sarrafa sanyi.Gabaɗaya sama ko ƙasa da yawan zafin jiki na yau da kullun na sarrafawa, zai haifar da sinadarai na workpiece ko canje-canjen lokaci da ake kira sarrafa zafi.Ana iya raba mashin ɗin sanyi zuwa yankan mashin ɗin da injin matsa lamba bisa ga bambancin hanyoyin sarrafawa.Ayyukan zafi yawanci sun haɗa da maganin zafi, ƙirƙira, simintin ƙarfe da walda.Bugu da ƙari, ana amfani da magani mai zafi da sanyi a cikin taro.Misali, idan aka hada bearings, ana sanya zobe na ciki a cikin ruwa nitrogen don sanyaya shi don rage girmansa, ana dumama zoben waje yadda ya kamata don kara girmansa, sannan a hada shi tare.Har ila yau, zobe na waje na motar jirgin yana zafi a kan matrix, wanda zai iya tabbatar da dacewar daurin lokacin da ya huce.

Bisa babbar kasuwa da kuma goyon bayan manufofi, kasar Sin ta zama kasa mafi girma a duniya wajen sarrafa injina da masana'antu da kuma kasuwar aikace-aikacen sarrafa injinan ramuka, haka ma injinan ramin cikin gida sun samar da wata gasa a kasuwannin duniya.Duk da haka, har yanzu akwai matsaloli da yawa a cikin masana'antar kera na cikin gida.Haɗin kai, buɗe kuma cikakkiyar gasa kasuwa lamari ne mai mahimmanci ga lafiya da ci gaban masana'antar injina.