Tube Bending thiab Fabrication

Lub raj thiab cov yeeb nkab fabrication npog ntau yam kev ua haujlwm xws li sawing, txiav, tsim cov txheej txheem xws li khoov, kawg sib sau, trimming, beveling, finning, grooving thiab threading, thiab dabtsi yog khoov yog ib qho ntawm feem ntau fabrication tov. Nws tuaj yeem ua tau manually lossis los ntawm lub khoos phis tawj - tswj cov tshuab dabtsi yog khoov los ntawm cov kev daws teeb meem kub lossis txias.

√  Knowing the specification of the tube, and the centerline radius, the outside diameter, and wall thickness are critical variables. Other bending variables include the inside bend radius, the outside bend radius, and the centerline radius or the neutral line are equally important factors for making correct bending.
√  Spingback effect, tubes will most probably springback after bending, generating a radial growth. In general, stainless steel tube has stronger springback effect than mild steel. 
√  For welded tube, if the weld seam or weld bead is too large or inconsistent, it will affect the tube bending roundness. 
√  Elongation effect, the outside radius stretches while inside radius compresses and at a certain point starts to wrinkle. Bending normally cause ovality, or a distortion of the cross section from its original round shape.

Lub raj bending txheej txheem pib nrog loading ib lub raj rau hauv lub tshuab dabtsi yog khoov, thiab ces clamp nws mus rau hauv ob tug tuag (lub clamping block thiab lub forming tuag), thiab ob lwm yam tuag (lub siab tuag thiab lub wiper tuag) loosely tuav lub raj.
Cov kauj ruam thib ob yog siv lub zog los thawb cov tubing los yog cov yeeb nkab tawm tsam qhov tuag, yuam lub raj kom hloov mus rau qhov tuag lub cev. Heev feem ntau, cov yeeb nkab Tshuag yog tuav nyob rau hauv qhov chaw thaum nws kawg yog tig tawm tsam lub tshuab dabtsi yog khoov tuag.
Rau ntau txoj kev khoov lub raj, lub mandrel yuav tsum tau muab tso rau hauv lub raj kom tiv thaiv kev sib tsoo lub caij no lub raj yog tuav hauv qhov nro los ntawm lub wiper tuag los cuam tshuam kev puas tsuaj thaum muaj kev ntxhov siab. Txhawm rau tiv thaiv kev puas tsuaj rau lub raj, lub wiper tuag feem ntau yog ua los ntawm cov ntaub ntawv softer xws li txhuas lossis tooj dag kom tsis txhob khawb lub raj.
There are few different bending machines are popular in the market, and they are human-powered, hydraulic-assisted, hydraulic-driven and pneumatic-powered. 

CLR- Center Line Radius: Hom CLR yog 3x OD ntawm lub raj tsis muaj mandrels. Nws tuaj yeem khoov ntawm 1 lossis 2xD khoov, tab sis tsis yog yam tsis muaj kev siv ntau dua.
Cov nqi cuab yeej kuj nce ntxiv thaum piv lub ntsaws mandrel rau 3-pob mandrel wiper tuag. Lub vojvoog nruj dua, cov cuab yeej xav tau ntau dua thiab qhov kim dua.
Siv tib CLR rau txhua qhov khoov tshwj tsis yog txwv tsis pub tsim kev txwv. Ncaj ntawm khoov: Cia 3x OD ntawm ncaj rau clamping ntawm khoov thiab los ntawm ntug ntawm lub raj.
Qhov no txo ​​cov nqi tag nrho ntawm ib feem los ntawm kev txo cov kev ua haujlwm trim ntxiv thiab ua kom tus nqi khoov. Khoov ze dua 3xD xav tau cov cuab yeej sib xyaw ua kom cov cuab yeej siv tau thiab txo tus nqi khoov.

Cov kev daws teeb meem yog txiav txim siab los ntawm daim ntawv thov, thiab muaj plaub txoj kev khoov, ram- hom dabtsi yog khoov, yob dabtsi yog khoov, compression dabtsi yog khoov, lossis rotary kos dabtsi yog khoov.
Ram dabtsi yog khoov, ib qho yooj yim txoj hlua khoov tov, nws siv lub hydraulically tsav ram uas quab yuam ib lub raj tiv thaiv chais kom ua tau ib tug centerline vojvoog uas ib txwm peb mus rau plaub zaug ntawm lub raj sab nraud txoj kab uas hla (OD).
Cov tshuaj no yog nrov nyob rau hauv square lossis rectangular tubing, uas muaj ntau tus tsim lub ram cuab tam kom txhob txwm compresses thiab me ntsis deforms lub sab hauv khoov vojvoog, thiab lub workpiece ID tsis txhawb mandrel. Vim nws txoj kev teeb tsa yooj yim, qhov kev daws teeb meem no yog qhov pheej yig tshaj plaws fabrication txoj kev, thiab nws tsis haum rau nruj bending kam rau ua. Nws yog haum rau cov ntawv thov uas ib puag ncig tus ntoo khaub lig- ntu tsis tas yuav tsum tau, vim qhov tsis muaj mandrel thiab kev txhawb nqa sab hauv tuaj yeem ua rau deformation uas ua rau oval -zoo li tus ntoo khaub lig-section.

Roll Bending 

Qhov kev daws teeb meem no feem ntau yog tsim los rau cov raj loj rau kev tsim kho, thiab yob dabtsi yog khoov feem ntau muaj peb yob nyob rau hauv lub pyramid, thiab cov tshuaj khoov no feem ntau yog siv los tsim cov spirals. Yob dabtsi yog khoov ua rau tus ntoo khaub lig zoo tib yam - ntu nrog me me deformation, thiab nws yog siv rau crafting nruas yob, khoom thav duab, truss kav, thiab lwm yam sib npaug, loj txoj kab uas hla.

Mandrel Bending 

Mandrel dabtsi yog khoov siv lub compression tuag (cov menyuam) khoov lub raj nyob ib ncig ntawm ib qho chaw ruaj khov khoov tuag, thiab cov menyuam tau zoo compresses lub raj tiv thaiv lub hauv paus khoov tuag.
Txoj kev no yog qhov tsim nyog tshaj plaws rau symmetrical tube dabtsi yog khoov, thiab nws haum zoo kawg nkaus rau cov raj khoov rau hauv nruab nrab kab vojvoog (CLR) uas yog tsawg kawg peb zaug ntawm lub raj OD.
Mandrel dabtsi yog khoov yog cov txheej txheem sib piv uas ua rau muaj qhov deformations tsawg heev hauv cov raj lossis cov kav dej, thiab nws tuaj yeem khoov cov raj nyias mus rau lub vojvoog ze dua vim yog siv cov khoom siv sab hauv.

Rotary Draw Bending 

For precision bending, rotary draw bending is the best option as it can achieve tight radii, making CLR less than 1 time of the outside tube. The biggest benefit is that this solution gives operator maximum control over wall thinning and ovality. The bending mechanism is that the pressure die holds the straight section of the tube while the clamp die rotates the workpiece around bend die with the mandrel consisting of articulating balls supporting the tube interior around the bend. In addition, some draw bending machines can be programmed to repeat complex bending operations on multiple workpieces, improving the precision and uniformity of a production run.

Rectangular Tube Rotary dabtsi yog khoov

Rotary dabtsi yog khoov Round Pipe

√  As a rule of thumb, make sure you have a combination of hard and soft material. If you have a hard workpiece, you need a soft mandrel; if you have a soft workpiece, you need to use a hard mandrel.
√  Radial growth or springback effect shall be taken into consideration.
√  Welded tube shall have consistent weld bead
√  Wiper die position shall be angled slightly so that its end contacts the tube just before the inside radius tangent point
√  The length of the clamping die shall be at least three times of the tube diameter, and the shorter the clamp is, the more pressure it puts on a short section of the workpiece, thus increasing the risk of deforming the tube.
√  For thin wall tubes, mandrel with balls supporting the tube ID is critical, and the series of balls shall start at the bend's beginning tangent point.
√  Bending force shall be strictly controlled when bending thin tubes, and controlling degrees of physical deformation on both inner and outside tube is important for creating a smooth rounded bend. 
√  Tube wall thickness factor, the ratio of a tube's wall thickness to its external diameter is critical to determine whether a tube should be treated as a thin or thick tube.
√  Lubricant is critical for heavy-duty bending with thick walls and tight radii, and concentrated lubrication is often used.
Meanwhile wiper tuag kuj yuav tsum tau lubricated kom zoo ntawm qhov chaw tiv thaiv kom tsis txhob hnav ntxov ntxov.

√  Crack
√  Wrinkle
√  Kinking
√  Flattening
√  Distortion

Cov laj thawj tseem ceeb yog:
√  Mandrel is not positioned properly in the tube
√  Bending thin wall tube or pipe without a mandrel
√  Clamping point is too close to the radius
√  Bending die, pressure die, wiper die, clamp die and mandrel are not corresponding well to the tube
√  Tube is not clamped properly during bending process
√  Bending radius is not calculated correctly

Fabmann muaj cov kws tshaj lij kev tsim hluav taws xob tsim hluav taws xob uas muaj kev paub dav dav hauv raj khoov thiab kev tsim khoom, thiab peb siv aluminium tube, me me steel tube thiab stainless hlau raj los tsim cov khoom sib txawv rau kev kho dej, racking system thiab chaw nres nkoj. Peb ib txwm siv zog los nrhiav txoj hauv kev los txhim kho cov txheej txheem thiab muab tus nqi- tau txiaj ntsig zoo rau peb cov neeg siv khoom, thiab peb txuas ntxiv muab cov khoom lag luam zoo thaum nrhiav txoj hauv kev los txo qhov tsis zoo -kev sib raug zoo. Peb ua tiav cov txiaj ntsig no los ntawm kev khaws cov neeg ua haujlwm paub txog kev txo qis ntawm kev hloov pauv, tswj kev sib raug zoo nrog cov neeg muab khoom, thiab ua kom muaj kev sib koom ua ke hauv - cov txheej txheem tsim cov cuab yeej hauv tsev kom tau txais kev txhim kho sai dua. Peb siv peb lub hauv paus kev paub dav dav los coj cov neeg siv khoom hauv kev tsim cov qauv thiab kho cov qauv tsim uas twb muaj lawm. Fabmann kuj tseem siv ntau yam kev kho hlau saum npoo av xws li kub dip galvanization, hmoov txheej thiab pleev xim rau ntawm cov hlab steel rau kev ua haujlwm zoo tshaj - corrosion. Peb lub raj khoov fabrication yog ua haujlwm hauv qab no:
√  Handrails
√  Bike Racks
√  Industrial Racks
√  Pallet forklift
√  Machinery
√  Solar Energy

Cracked Tube los ntawm Khoov

Distortion hauv U Bend

Kinked Tube

Wringle hauv Big Rasius Khoov

Wrinkled Khoov nrog txawv Radius

Wrinkled Khoov

√  Square steel tube, black or galvanized, seamless or welded.
√  Rectangular steel tube, black or galvanized, seamless or welded.
√  Round steel tube upto 120mm (OD), seamless or welded.

Fabmann muab kev pabcuam tube fabrication nrog ntau yamhlau nto khorauof elevator tshuab and Aquaculture, and our team impletements strict production process control during daily operation. FAI (first article inspection) is fully excuted  for each order, and full traceablity of our production is deeply rooted in our day to day operation. 

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