Phau ntawv qhia no yuav piav qhia txog 16 hom stamping thiab stretching txheej txheem.

Stretch forming yog txheej txheem stamping uas siv qhov tuag los ua lub tiaj tiaj tiaj rau hauv qhov qhib, qhov khoob. Stretching yog ib qho ntawm cov txheej txheem tseem ceeb stamping thiab muaj kev siv dav. Stretching tuaj yeem tsim nyias- cov phab ntsa hauv cylindrical, rectangular, stepped, spherical, conical, parabolic, thiab lwm yam tsis xwm yeem. Thaum ua ke nrog lwm cov txheej txheem stamping, nws tuaj yeem tsim cov duab ntau dua.

Stretch forming siv cov khoom siv stamping suav nrog: ncab, rov-stretching, thim rov qab stretching, thiab thinning stretching.

Stretching: Siv lub phaj siab thiab lub zog ntawm lub punch, ib feem los yog tag nrho cov ntawv tiaj tus yog kos rau hauv cov kab noj hniav concave, tsim lub thawv hauv qab. Kev ua haujlwm qhov twg lub thawv cov phab ntsa yog qhov sib npaug mus rau qhov kev taw qhia ncab yog ib qho yooj yim stretching txheej txheem. Txawm li cas los xij, stretching conical (los yog pyramidal) ntim, hemispherical ntim, thiab parabolic ntim kuj suav nrog kev nthuav dav.

Re-stretching: Rau qhov sib sib zog nqus- cov khoom kos uas tsis tuaj yeem ua tiav hauv ib txheej txheem ncab, cov khoom tsim yuav tsum tau ncab dua ntxiv kom qhov tob ntawm lub thawv tsim.

Rov qab kos duab: Cov txheej txheem no thim rov qab daim duab ntawm lub workpiece los ntawm cov txheej txheem dhau los, tig sab hauv ntawm lub workpiece mus rau sab nraud thiab txo nws txoj kab uas hla.

Thinning daim duab: Cov txheej txheem no siv cov xuas nrig ntaus kom yuam lub thawv ua ntej- tsim lub thawv rau hauv cov pwm kab noj hniav me me dua li lub thawv sab nraud, txo cov kab npoo sab nraud ntawm lub thawv hauv qab thiab tib lub sijhawm thinning phab ntsa tuab. Qhov no tshem tawm cov phab ntsa thickness sib txawv thiab ua rau lub thawv ntim du.

Thaum siv cov khoom siv stamping rau hlau stamping thiab kos duab, 16 hom hauv qab no suav nrog:

1. Round drawing: Kos duab ntawm flanged cylindrical khoom. Lub flange thiab hauv qab yog planar, lub cylindrical sidewalls yog axisymmetric, thiab cov deformation yog sib npaug zos rau tib lub voj voog, uas ua rau lub tensile deformation ntawm qhov khoob ntawm flange.

2. Ellipse daim duab: Lub deformation ntawm qhov khoob ntawm flange yog tensile deformation, tab sis tus nqi thiab qhov sib piv ntawm deformation txawv raws li cov duab contour. Qhov ntau dua qhov curvature, ntau dua cov yas deformation ntawm qhov khoob; conversely, qhov me dua qhov curvature, qhov me me ntawm cov yas deformation ntawm qhov khoob.

3. Rectangular drawing: Ib qho qis qis uas tsim los ntawm ib qho -lub sij hawm kos duab. Thaum lub sij hawm kos duab, lub stretching tsis kam ntawm cov ces kaum ntawm lub flange deformation cheeb tsam yog ntau dua li ntawm cov npoo ncaj, thiab cov℃ntawm deformation ntawm cov ces kaum sib npaug yog ntau dua li ntawm cov npoo ncaj.

4. Kev kos duab toj roob hauv pes: Thaum lub sidewall ntawm lub stamped seem yog sloping, lub sidewall raug tshem tawm thaum lub sij hawm stamping txheej txheem thiab tsis ua raws li cov pwm kom txog thaum lub forming tiav. Cov yam ntxwv deformation ntawm qhov sib txawv ntawm cov phab ntsa tsis zoo ib yam thaum tsim.

5. Kev kos duab toj roob hauv pes: Lub deformation ntawm qhov dawb paug thaum lub sij hawm tsim cov txheej txheem ntawm lub hau npog phaj tsis yog ib qho yooj yim stretching deformation, tab sis ib tug sib sau txheej txheem uas stretching thiab bulging deformation tshwm sim ib txhij. Lub deformation ntawm qhov khoob ntawm qhov blanking nto yog stretching deformation (radial tensile kev nyuaj siab, tangential compressive stress), thaum lub deformation ntawm cov dawb paug nyob rau hauv lub contour (tshwj xeeb tshaj yog lub hauv paus cheeb tsam) yog bulging deformation (ob leeg radial thiab tangential tensile stress) . 6. Flange Hemisphere qhov chaw ntawm kos duab kos duab: spherical sab saum toj ntawm punch, thaum feem ntau ntawm qhov khoob tseem raug tshem tawm thiab tsis muaj kev txwv. Yog li ntawd, cov txheej txheem tseem ceeb hauv kev kos duab xws li cov kheej kheej yog qhov hnyav thinning ntawm qhov chaw sib cuag lossis tsis ruaj khov thiab wrinkling ntawm qhov chaw nkhaus.

7. Flange Drawing: Qhov no suav nrog kev kos duab ntiav ntawm qhov flange ntawm cov khoom kos. Nws cov kev ntxhov siab- cov yam ntxwv zoo li compression flanging. Vim yog tangential compressive kev nyuaj siab, wrinkling yog ib qho, yog li qhov kev txwv tsuas yog txwv los ntawm compression wrinkling.

8. Flange Drawing: Qhov no suav nrog angular re-kos duab ntawm flange feem ntawm cov khoom kos yav dhau los. Cov txheej txheem no yuav tsum muaj cov khoom zoo plasticity.

9. Kev kos duab sib sib zog nqus: Cov khoom lag luam tshaj li qhov txwv tsis pub kos duab yuav tsum muaj ntau yam kev kos duab (ob lossis ntau dua) ua kom tiav. Cov khoom uas tau dhau qhov tob- kev taw qhia kev kos duab nyob rau theem dhau los yog rov qab - kos rau hauv qhov tob. Rau qhov dav -flange kos qhov chaw, flange txoj kab uas hla yog ua tiav thaum thawj daim duab kos, thiab tseem tsis hloov pauv thaum kos duab tom ntej.

10. Taper daim duab: Rau qhov sib sib zog nqus tapered nrog h / d > 0.8 thiab=10℃-30 degree, qhov tob loj ua rau muaj qhov tsis muaj qhov tsis zoo. Lub zog tsim yog pauv tsuas yog los ntawm thaj chaw sib tiv tauj ntawm qhov khoob thiab cov punch, yooj yim ua rau ntau dhau ntawm thinning thiab txawm tawg ntawm qhov khoob. Ntau qhov kev hloov pauv yuav tsum tau ua kom maj mam shaping. Txoj kev kos duab kauj ruam ua ntej kos qhov khoob mus rau hauv ib qho kev hloov pauv, nrog rau cov duab stepped tangent mus rau sab hauv cov duab ntawm cov kab tapered, thaum kawg nthuav mus rau daim duab tapered. Tus naj npawb ntawm cov voj voog thiab cov txheej txheem rau cov kauj ruam hloov pauv yog tib yam li rau cov kauj ruam cylindrical.

11. Rectangular redrawing: Rau cov duab plaub siab uas tsim los ntawm ntau lub voj voog, qhov deformation txawv tsis yog ntawm qhov sib sib zog nqus cylindrical tab sis kuj tseem ceeb ntawm qhov qis qis. Daim duab 1-46 qhia txog cov kev hloov pauv ntawm cov duab thiab qhov ntev ntawm lub thawv duab plaub- zoo li ib feem thaum lub sij hawm ntau txoj kev ncab ntawm ntau lub chaw nres tsheb tsis siv neeg conveyor xovxwm, qhia txog qhov txawv ntawm qhov siab stretching.

12. Surface Forming: Nto stretching yog ib txoj kev stamping uas txo cov flange sab nrauv thiab elongates sab hauv flange feem ntawm cov hlau tiaj tiaj, uas ua rau cov khoom hollow nrog cov duab nkhaus uas tsis ncaj -walled lossis flat- hauv qab.

13. Kauj Ruam Kos duab: Cov khoom pib ncab ntawm sab laug yog re-stretched los ua cov kauj ruam hauv qab ntawm sab xis. Cov ntu sib sib zog nqus deform nyob rau hauv cov theem thaum ntxov ntawm stretching, thaum cov seem ntiav deform tom qab. Shear stress yog yooj yim induced ntawm sidewalls ntawm cov kauj ruam hloov seem, ua deformation.

14. Rov qab kos duab: Lub workpiece, stretched nyob rau hauv cov txheej txheem dhau los, yog stretched nyob rau hauv lub rov qab kev taw qhia, ib hom re-stretching. Rov qab kos duab nce radial tensile kev nyuaj siab, zoo tiv thaiv wrinkling. Nws kuj tseem tuaj yeem ua kom cov coefficient stretching ntawm re-stretch.

15. Ironing: Tsis zoo li daim duab zoo tib yam, ironing feem ntau hloov cov phab ntsa tuab ntawm qhov kos thaum lub sij hawm txheej txheem kos duab. Qhov sib txawv ntawm lub punch thiab tuag yog me dua li qhov dawb paug thickness. Qhov ncaj- ntu ntu ntawm phab ntsa ntawm qhov khoob yog nyob rau hauv ntau dua cov kev ntxhov siab compressive thaum nws hla qhov sib txawv. Thaum lub sij hawm kos duab, phab ntsa thickness txo, tshem tawm cov phab ntsa thickness deviations, nce nto smoothness, thiab txhim kho precision thiab lub zog.

16. Vaj Huam Sib Luag Drawing: Cov khoom vaj huam sib luag yog cov ntawv hlau stampings nrog cov duab zoo nkauj. Nyob rau hauv cov txheej txheem kev kos duab, cov dawb paug undergoes complex deformation; nws cov khoom tsim tsis yog ib qho yooj yim kos duab tab sis cov txheej txheem sib xyaw ua ke uas muaj ob qho tib si sib sib zog nqus thiab bulging.