Ingabe umshini wokuvala ungamukela isimiso sokujika kabili, umphumela wokuvala ufinyelelwa ngesinyathelo sokugoqa kanye nokwenza isicaba unqenqema lwesivalo kanye nekani. Izinyathelo zokwakheka zimi kanje:

1.Irola yokuqala yokusebenza yokuthunga, lapho umzimba wethini futhi ungavala ukungena ngaphansi kwekhanda elivalayo, ithreyi eliphansi liyakhuphuka, ngesikhathi esifanayo, isivalo sethini sifakwe ukucindezelwa yi-seaming chuck esetshenzisiwe emile.

2.Bese i-rola yokuthunga yokuqala yokusebenza iqala ukugoqwa emzimbeni wethini futhi izungeze isivalo sethini. Phakathi nale nqubo. I-flange ye-can body izogobela phansi, njengoba kukhonjisiwe ku-Fig A. Ihhuku eseceleni yekani iyakhiwa, futhi unqenqema lwesivalo sethini lugobelwe phansi njengoba kuboniswe ku-Fig. B, bese lugoqwa ngasekugcineni kwehhuku. ohlangothini lwekani ukuya ohlangothini lwalo olungaphakathi ukuze kwakheke isivalo se-can huku. Ngakho-ke, i-hemming eyakhiwe umzimba wethini kanye nesivalo se-can siyakhiwa. Njengoba kuboniswe ku-Fig C.

3.Ngemva kokuthi umsebenzi uqediwe wokuqala, umsebenzi wesibili wokuthunga irola uphushezelwa phambili, futhi i-curl eyakhiwe umsebenzi wokuqala cindezelwa futhi yenziwe isicaba ukuze kukhishwe imibimbi ye-curl ukuze yenziwe. bushelelezi, futhi inhlanganisela yokuvala isetshenziswa. Igebe kungqimba olugoqiwe ligcwaliswa ngokuphelele ukuze kwakheke ubuhlalu obuvala igesi obuqinile, futhi umsebenzi wokuvala uyaqedwa njengoba kuboniswe ku-Fig.D

4. Ithreyi liyayehliswa futhi ikani elivalekile likhishwe ku-chuck yokuthunga. . Izinyathelo zokwakheka ziboniswa kuMfanekiso 1.