Zothetsera Kuwonongeka kwa Shrinkage mu Aluminium Profile Extrusion

Mfundo 1: Chidziwitso chazovuta zomwe zimachitika ndi kuchepa panthawi ya extruder extruder:

Popanga mbiri ya aluminiyamu extrusion, zolakwika zomwe zimadziwika kuti shrinkage ziwoneka muzomaliza pambuyo podula mutu ndi mchira pambuyo poyang'anira alkali etching. Makina amtundu wa aluminiyumu omwe ali ndi dongosololi samakwaniritsa zofunikira, zomwe zimapangitsa kuti pakhale ngozi.

Pa nthawi yomweyo, pamene opangidwa zotayidwa aloyi mbiri ndi pansi mankhwala pamwamba kapena kutembenukira processing, kukhalapo kwa chilema kuwononga kupitiriza mkati mwa zinthu, zomwe zingakhudze wotsatira pamwamba ndi kumaliza. Pazovuta kwambiri, zidzachititsa kuti zizindikiro zobisika ziwonongeke kapena kuwonongeka kwa chida chotembenuza ndi zoopsa zina, izi ndizovuta zomwe zimachitika pakupanga. Pano, nkhaniyi ikufotokoza mwachidule zifukwa zomwe zimapangidwira shrinkage ya aluminiyamu komanso njira zothetsera izo.

Mfundo 2: Gulu la shrinkage mu mbiri ya aluminiyamu yotulutsidwa ndi ma extruders: shrinkage yopanda kanthu ndi annular shrinkage:

1) Kuchepa kwapakati: A dzenje amapangidwa pakati pa mchira mapeto a extruded mbiri ndi mipiringidzo. Gawo la mtanda limawoneka ngati dzenje lokhala ndi m'mphepete mwaukali kapena dzenje lokhala ndi m'mphepete mwa zonyansa zina. Mayendedwe a nthawi yayitali ndi chulu chooneka ngati funnel, nsonga ya funnel imayang'anizana ndi mayendedwe achitsulo. Izi makamaka zimachitika limodzi-dzenje ndege kufa extrusion, makamaka pa mchira wa mbiri extruded ndi ang'onoang'ono extrusion coefficients, lalikulu mankhwala diameters, wandiweyani makoma, kapena mafuta othimbirira extrusion gaskets.

2) Kuchepa kwapang'onopang'ono: The malekezero awiri a extrusion shunt kuumbidwa mankhwala, makamaka mutu, ndi discontinuous mphete kapena arcs, ndi kachigawo kachigawo zoonekeratu mbali zonse za mzere kuwotcherera. The annular shrinkage pa bowo lililonse mankhwala ndi symmetrical.

Chifukwa mapangidwe shrinkage: The mawotchi chikhalidwe mapangidwe shrinkage ndi pamene advection siteji umatha ndipo extrusion gasket pang'onopang'ono kuyandikira kufa, extrusion kumawonjezera ndi kupanga kupanikizika dN pa mbali pamwamba pa mbiya extrusion. Mphamvu imeneyi pamodzi ndi friction force dT silinda, pamene mphamvu yolinganiza chikhalidwe cha dN cylinder ≥ dT pad yawonongeka, chitsulo chomwe chili pafupi ndi dera la extruded gasket chimayenda cham'mbuyo m'mphepete mpaka pakati pa chopanda kanthu, ndikupanga shrinkage.

Mfundo 3: Ndi zinthu ziti zomwe zimayambitsa kutsika kwa extruder:

1. Zowonjezera zotsalira zatsala zazifupi kwambiri

2. The extrusion gasket ndi mafuta kapena zakuda

3. Pamwamba pa ingot kapena ubweya wa ubweya siukhondo

4. Kutalika kwa mankhwala sikumatsatira malamulo

5. Mzere wa cylinder extrusion ndi wosalolera

6. Kuthamanga kwa extrusion mwadzidzidzi kumawonjezeka.

Mfundo 4: Njira zochotsera shrinkage yopangidwa ndi makina a aluminiyamu extrusion ndi njira zochepetsera ndikuletsa mapangidwe a shrinkage:

1. Tsatirani mosamalitsa ndondomeko ya ndondomeko kudula ndi kukanikiza owonjezera, anaona mutu ndi mchira, kusunga akalowa ya yamphamvu extrusion bwino, kuletsa mafuta extrusion gaskets, kuchepetsa kutentha kwa zotayidwa ndodo pamaso extrusion, ndi ntchito otukukira makutu gaskets wapadera. Sankhani utali wokwanira wa zinthu zotsalira.

2. Pamwamba pa zida za extrusion ndi ndodo za aluminiyamu ziyenera kukhala zoyera

3. Yang'anani pafupipafupi kukula kwa silinda ya extrusion ndikusintha zida zosayenera

4. Kutulutsa kosalala, kuthamanga kwapamwamba kuyenera kuchepetsedwa pang'onopang'ono pambuyo pake, ndipo makulidwe otsalawo ayenera kusiyidwa moyenera, kapena njira yowonjezera yowonjezera zinthu zotsalira ziyenera kugwiritsidwa ntchito.

Mfundo 5: Kuti athetse bwino zochitika za shrinkage panthawi yopanga makina opangira aluminiyamu, makulidwe owonjezera a extruder amafunikanso kumvetsera. Zotsatirazi ndizomwe zimatchulidwira za makulidwe owonjezera:

Extruder tonnage (T) makulidwe owonjezera (mm)

800T ≥15mm 800-1000T ≥18mm

1200T ≥20mm 1600T ≥25mm

2500T ≥30mm 4000T ≥45mm

Adasinthidwa ndi May Jiang kuchokera ku MAT Aluminium