Thaum lub qhov tob ntawm lub qhov yog ntau zaus ntawm txoj kab uas hla ntawm lub qhov taub, qhov tob ntawm lub qhov tob xav tau yog xav tau. Rau ntau tshaj li ntawm 70 xyoo, ib qho ntug tob ntawm lub qhov tob tob (rab phom xyaum) yog ib qho khoom siv heev rau kev siv lub tshuab ua qhov tob nrog txoj kab uas hla tsawg dua 40mm. Tab sis hauv cov ntawv thov siv, kev ua tau zoo ntawm ib qho ntug tob qhov tob qhov tob yog qhov tsawg, uas ua rau txoj kev loj hlob sai ntawm cov khoom carbide sib sib zog nqus lub qhov sib tw. Kev txhim kho ntawm cov khoom carbide sib sib zog nqus qhov sib tw laum yog qhov txiaj ntsig ntawm kev txhim kho ntawm cov cuab yeej kev tsim khoom raug thiab qhov zawj thiab qhia kev tsim ntug. Txawm li cas los xij, qhov kev sib sib zog nqus ntawm lub qhov ntswj tuaj yeem tsuas yog ua cov qhov nrog cov qhov sib txawv me me / taub loj. Rau qhov tob, ib sab ntug lub qhov tob yuav tsum tau siv. Piv nrog rau cov khoom carbide ib ntug sib sib zog nqus lub qhov tob tho, ob txoj kab sib dhos ob txoj kab sib tw yuav txais tau ntau dua qhov pub ceev, yog li muaj ntau yam cuab yeej ntawm lub lag luam, tab sis nws qhov tsis zoo yog qhov tsis zoo ntawm lub qhov tsis zoo, thiab nws tuaj yeem tsuas yog siv nyob rau qee sijhawm qhov kev tsim ua lag luam tsis siab.
Ntawm qhov tsis sib thooj, los ntawm kev sib piv ntawm kev sib piv, peb tuaj yeem pom tias qhov zoo ntawm cov ntug ib qhov tob qhov tho qhov yog tias qhov khoom siv drilling yog qhov siab dua, tab sis qhov tsis zoo yog tias qhov kev pub ceev yog me dua. Thaum machining quenched thiab tempered steel, yog tias qhov pub khoom noj nce ntxiv, lub cuab yeej hnav yuav nce ntxiv thiab nti nti yuav tsis zoo. Yog li ntawd, qis machining efficiency thiab luv cuab tam lub neej yog qhov tsis zoo ntawm dog dig ib ntug qhov tob qhov tho.
