Ntug Durometer

A Shore Durometer yog ib qho ntawm cov cuab yeej siv tau zoo tshaj plaws uas ib tus tuaj yeem siv los txiav txim siab cov khoom siv rau pwm nrum. Nyob ntawm seb qhov sib txawv ntawm qhov tsim ntawm cov khoom yuav raug muab pov tseg, qhov yooj ntawm cov pwm roj hmab yuav txiav txim siab. Cov khoom uas muaj cov yam ntxwv nyuaj dua los yog ntau lub ntsej muag thiab cov caj npab txuas ntxiv yuav xav tau cov pwm nrog ntau qhov flex uas yuav tso cai rau kev tshem tawm yooj yim tom qab nws tau muab pov tseg.

Yog li ntawd, Shore 30A durometer roj hmab yuav zoo dua li Shore 70A durometer roj hmab uas yog firmer thiab tsis yooj yim. Hloov chaw, Shore 70 durometer roj hmab yog qhov tsim nyog rau kev ua pwm ntawm cov khoom tiaj tus nrog ib qho chaw zoo li cov vuas thiab paving pob zeb. Cov khoom no xav tau kev hloov pauv tsawg dua hauv lawv cov pwm vim lawv tuaj yeem tshem tau yooj yim.

Durometers kuj tseem ceeb heev thaum nws los txog rau xaiv hom silicone roj hmab rau siv nyob rau hauv tshav kub sealing daim ntaub ntawv. Kub kub sealing silicone roj hmab uas muaj qhov qhab nia ntawm Shore 70A rau Shore 90A tau pom zoo siv rau sab uas tuaj rau hauv kev sib cuag nrog cov cuab yeej cua sov. Raws li piv rau cov roj hmab silicone uas muaj qhov qhab nia durometer qis dua, Shore 70A durometer roj hmab muaj peev xwm muab cov cua sov hloov pauv zoo dua uas txhais tau rau kev sib khi kom zoo dua.

Yuav kom nkag siab txog qhov ntsuas qhov tawv tawv, nws yog ib qho tseem ceeb kom nco ntsoov tias lub durometer tsis yog ib chav ntsuas. Es tsis txhob, ib tug durometer yog ib tug dimensionless ntsuas raws li tus txheeb ze hardness ntawm ntau yam ntaub ntawv. Yog li, Shore hardness scale tsim ib qho chaw siv rau kev sib piv cov ntaub ntawv no.

Durometer tau ntim rau hauv peb lub ntug dej hiav txwv. Txhua Ntu ntug dej hiav txwv nyob rau hauv hardness ntawm 0 mus rau 100:

00 - Ntsuas lub teeb ua npuas ncauj, daim txhuam cev roj hmab, thiab cov gels mos
A - Ntsuas cov roj hmab muag, cov yas, thiab cov roj hmab zoo li elastomers
D - Ntsuas cov roj hmab tawv, yas, thiab cov thermoplastics

Txhua qhov ntawm peb qhov Shore nplai siv lub durometer nrog ib rab koob sib txawv. Vim muaj ntau yam hauv koob loj, qee qhov Shore scales yog qhov zoo tshaj plaws rau kev ntsuas qee yam khoom.

Txawm hais tias qhov twg Shore scale qhov kev ntsuas poob qis, cov lej ntau dua txhais tau tias muaj kev tiv thaiv ntau dua rau lub koob durometer, thaum cov lej qis qhia qis dua. Cov ntaub ntawv uas tau qhab nia qis dua yog softer, thaum cov ntaub ntawv uas tau qhab nia siab dua yog nyuaj.

Txhawm rau ntsuas qhov hardness ntawm cov roj hmab thiab cov yas, ib rab koob txuas nrog lub durometer yuav muab tso rau ntawm cov khoom. Tom qab ntawd lub siab yog siv rau lub durometer rau rab koob kom nias khov kho perpendicularly rau hauv cov khoom thiab kev nyeem ntawv yuav qhia qhov hardness ntsuas rau cov khoom. Lub zog txaus yuav tsum tau siv rau lub durometer los xyuas kom meej tias cov ntawv nyeem tau raug raws li qhov ua tau.

Shore A durometers yuav xav tau lub zog tsawg dua ntawm 0.822kg thaum Shore D durometer yuav xav tau lub zog ntau dua ntawm 4.55kg. Qhov no yog vim cov ntaub ntawv ntsuas nrog Shore D durometers yog qhov nyuaj dua thiab yog li yuav tsum tau siv zog ntau dua los siv cov ntawv nyeem kom raug. Txawm hais tias hom durometer nplai, txawm tias lub siab yuav tsum tau thov rau 15 vib nas this.

Nws yog ib qho tseem ceeb heev los xyuas kom meej tias cov khoom uas tau sim muaj ib tug tiaj tus, vim hais tias hardness nyeem nrog ib tug durometer yuav tsis muaj tseeb yog hais tias nws tau ua nyob rau hauv cov chaw uas yog puag ncig, ntxhib los yog tsis sib xws. Cov qauv ntawm cov khoom kuaj yuav tsum yog tsawg kawg yog 19mm los ntawm 44mm nyob rau hauv loj nrog ib tug tuab ntawm 6mm.

Ob peb txheej nyias ntawm cov khoom yuav raug muab tso rau kom ua tiav 6 hli tuab qhov yuav tsum tau tab sis yuav tsum tau saib xyuas kom tsis txhob muaj huab cua los ntawm kev cuam tshuam ntawm cov khaubncaws sab nraud povtseg. Qhov nruab nrab ntawm 5 qhov kev nyeem ntawv yuav tsum tau muab coj los ua, txhua yam tsawg kawg 13 hli ntawm cov npoo thiab 6 hli sib nrug los ntawm ib leeg kom ntseeg tau tias kev nyeem ntawv ncaj ncees thiab tsis cuam tshuam.

Silicone extrusion yog siv nyob rau hauv ntau yam kev siv, los ntawm aircraft seals mus rau qib kev kho mob tubing. Txhawm rau kom paub tseeb tias koj muaj silicone zoo rau koj daim ntawv thov, daim ntawv thov yuav tsum tau ua kom zoo sib xws rau cov khoom silicone. Muaj ntau yam khoom siv uas yuav cuam tshuam rau peb cov khoom siv silicone hauv koj daim ntawv thov. Ib qho ntawm cov khoom tseem ceeb tshaj plaws yog hardness lossis "durometer".

Lub hardness ntawm cov khoom yog hais txog yuav ua li cas yooj yim cov ntaub ntawv resists deformation nyob rau hauv compression. Muab ntau yooj yim, yog hais tias ib yam dab tsi yog nias rau saum npoo ntawm cov khoom, hardness qhia peb yooj yim npaum li cas cov khoom yog deformed los yog cim. Nyob ntawm cov khoom siv, muaj ntau qhov kev ntsuam xyuas tus qauv uas tuaj yeem siv los txiav txim siab hardness. Cov hlau feem ntau raug sim siv cov txheej txheem Vickers lossis Rockwell - cov xovxwm me me rau hauv qhov chaw ntawm cov hlau raws li tus qauv thauj khoom thiab ntsuas qhov loj ntawm qhov tshwm sim.

Rau elastomers xws li silicone, hardness yog ntsuas siv Shore Durometer test. Qhov kev ntsuas no ntsuas qhov tob uas lub khob me me tuaj yeem nias rau hauv qhov chaw ntawm silicone. Qhov tob uas lub khob hliav qab rau hauv silicone yog hloov mus rau tus nqi ntawm Shore Durometer nplai. Lub khob hliav qab tob rau hauv cov silicones mos thiab cov no muaj tus nqi qis ntawm qhov ntsuas. Yog hais tias cov silicone yog ib qho nyuaj, lub khob hliav qab tsis nyob deb heev thiab tus nqi ntawm ntug dej hiav txwv yog siab.

Muaj ntau qhov kev hloov pauv ntawm Shore Durometer test rau ntau hom elastomers. Feem ntau yog Shore Durometer A rau mos elastomers thiab Shore Durometer D rau tawv elastomers. Txhua qhov kev ntsuam xyuas muab tus nqi hardness ntawm 0 mus rau 100. Qhov kev xeem Shore A feem ntau yog siv los ntsuas qhov hardness ntawm silicones - feem ntau ntawm peb cov silicones poob ntawm 25 thiab 80 Duro Shore A. Muaj cov khoom siv los kuaj Shore hardness rau lub ASTM D2240 tus qauv.

Kom tau txais lub tswv yim ntawm qhov sib txawv hardness nplai txhais li cas, 25 Duro silicone tuaj yeem yooj yim compressed nrog koj cov ntiv tes - xav txog cov roj hmab uas cov roj hmab bands tau ua los ntawm. 80 Duro silicone yog ib qho nyuaj rau compress, zoo li cov roj hmab hauv cov khau ib leeg.

Txhawm rau kom ntseeg tau tias silicone koj xaiv rau koj daim ntawv thov ua tiav raws li qhov xav tau, nws yuav tsum muaj qhov zoo durometer. Rau cov ntawv thov xws li lub tshuab nqus tsev, lub durometer qis yuav yog txoj cai, thaum lub gaskets yuav xav tau qhov nruab nrab mus rau siab durometer.can tailor ib silicone khoom rau durometer yuav tsum tau rau koj daim ntawv thov.

Durometer Hardness yog siv los txiav txim siab qhov sib txawv ntawm cov khoom muag, feem ntau yog cov yas lossis roj hmab, yog ua los ntawm Shore Durometer Test raws li tus qauv raug xa mus. Zoo ib yam li cov kev ntsuam xyuas hardness rau hlau, txoj kev no txiav txim siab cov khoom tsis kam mus rau indentation los ntawm kev nkag mus ntawm ib qho indenter rau hauv cov qauv kuaj yog li muab tus nqi hardness.

Vim tias qhov hloov pauv ntawm cov polymers sib txawv, LMATS tau nruab nrog ntau yam indenters siv rau hauv kev sim sib txawv ntawm cov ntaub ntawv mos los ntawm elastomers thiab cov khoom siv roj hmab ntuj, neoprene, polyesters, mos PVC, tawv, nitril rubbers, waxes thiab xav tau cov yas yas thiab ntau dua.

Tus ntug dej hiav txwv durometer A scale indenter "cov qauv mos" yog ib tug Hardened steel pas nrig 1.1 hli - 1.4 hli txoj kab uas hla, nrog ib tug truncated 35 degree cone (frustum), 0.79 hli txoj kab uas hla.
Lub ntug dej hiav txwv durometer D scale indenter "cov qauv nyuaj" yog ib tug Hardened steel pas nrig 1.1 hli - 1.4 hli txoj kab uas hla, nrog ib tug 30 degree conical point, 0.1 hli vojvoog taub hau.

LMATS tsis tu ncua ua Durometer Hardness Test rau ASTM D2240 thiab ISO 868
Siv cov Shore hardness (siv Shore A thiab D nplai) ntawm cov khoom hauv qab no:

Cov yas tawv thiab mos (cov ntsaws ruaj ruaj, gaskets, log tsheb treads, roj hmab log, o-rings, polyolefins, fluoropolymers, vinyl's, HDPE, LDPE)
Roj hmab
Sealants
Elastomers

Kev Ntsuas Rau Durometer
Ib qho o-ring lub hardness feem ntau hu ua nws lub durometer vim tias hardness yog ntsuas los ntawm lub ntsuas durometer. Muaj peb yam tseem ceeb ntawm hardness:

● Ntug dej 00: Ntsuas cov roj hmab thiab cov gels uas yog mos heev, nrog rau cov khoom qab zib gummy thiab gel ntxig rau khau.

● Ntug A: Cov khoom siv feem ntau muab ntau qhov nyuaj ntawm kev sib tw. Qhov ntsuas no ntsuas cov pwm hloov tau yooj yim uas muaj los ntawm cov mos mos heev rau cov tawv tawv tshwj xeeb uas yuav luag tsis muaj kev hloov pauv. Qee cov plastics semi-rigid kuj tuaj yeem poob mus rau qhov siab kawg ntawm qhov ntsuas.

● Ntug D: suav nrog cov roj hmab tawv tawv, los ntawm qhov hnyav nruab nrab mus rau qhov nyuaj heev. Lub Shore D scale kuj suav nrog cov yas semi-rigid rau cov yas tawv.

● Hom M: piav raws li qhov ntsuas micro-hardness. Hom M yog qhov tsim nyog rau kev ntsuas qhov tawv ntawm cov qauv uas tsis tuaj yeem ntsuas qhov tseeb siv Shore A ntaus ntawv. Hom M durometer yog tsim los siv rau cov qauv uas muaj qhov tsawg kawg nkaus tuab ntawm 0.050 ntiv tes, txawm hais tias nws tuaj yeem siv rau cov qauv nyias nyias yog tias muaj cov ntaub ntawv txhawb nqa qhov tseeb ntawm qhov ntsuas.

Muaj ntau ntau txoj hauv kev ntsuas tus qauv uas muaj nyob rau kev ntsuas roj hmab durometer. ASTM D-2240 thiab ISO 868 yog ob qho tib si. Cov kev qhia tshwj xeeb no feem ntau suav rau cov roj hmab poob hauv thaj tsam ntawm 20 txog 90 Ntug A.

●ASTM D-2240: Txoj kev sim no siv cov cuab yeej nkag mus rau hauv cov roj hmab raws li cov xwm txheej tshwj xeeb los ntsuas qhov ntsuas qhov ntsuas. Cov txheej txheem no yog siv los txiav txim qhov indentation ntawm thermoplastic elastomers, vulcanized roj hmab, elastomeric cov ntaub ntawv, gel cov ntaub ntawv thiab ib co plastics.

●ISO 868: Qhov kev ntsuam xyuas no ntsuas qhov indentation tsis kam ntawm cov yas los ntawm ob hom: hom A thiab hom D. Hom A yog siv rau cov ntaub ntawv softer thaum hom D rau cov yas tawv dua. Txoj kev no tso cai rau kev ntsuas qhov pib nkag lossis indentation tom qab lub sijhawm teev tseg kom nkag siab tias cov khoom yuav ua haujlwm li cas hauv qee qhov chaw.

Kev ntsuas qhov nyuaj ntawm qhov chaw sib txawv yog qhov tseem ceeb ntawm kev kuaj cov khoom, feem ntau ua tiav siv lub durometer. Cov cuab yeej no txiav txim siab qhov kev tiv thaiv ntawm indentation los ntawm nias ib rab koob rau saum npoo, thiab qhov tshwm sim quab yuam tau hloov mus rau hauv tus nqi hardness.

Txhawm rau kom paub tseeb tias qhov tseeb, qhov kev ntsuam xyuas tau ua nyob rau qhov tsawg kawg ntawm peb qhov chaw sib txawv, nrog rau txhua qhov chaw muaj cov khoom tuab ntawm tsawg kawg 6 hli. Qhov nruab nrab ntawm cov kev ntsuas no yog xam los txiav txim siab tag nrho hardness ntawm cov khoom nyob rau hauv kev ntsuam xyuas. Lub Shore A thiab Shore D durometers (saib daim duab 1 hauv qab) muaj cov ntawv thov siv tau rau ntau yam khoom siv.

Lub Ntug Dej A durometer yog haum rau qhov chaw softer. Nws cov ntawv thov tuaj yeem suav nrog: roj hmab, polyester, tawv, siv quav ciab, thiab lwm yam. Qhov siab tshaj plaws hardness nws ntsuas tau yog 100; Txhua yam siab dua yog ntsuas los ntawm Shore D.

Shore D durometer yog haum rau cov tawv tawv. Nws cov ntawv thov tuaj yeem suav nrog: ntoo, roj hmab tawv, yas, flooring, bowling balls, thiab lwm yam.

Hauv kev siv cov tswv yim, durometers muaj ntau yam zoo kawg li, ua rau lawv cov cuab yeej muaj txiaj ntsig thoob plaws ntau yam kev lag luam. Piv txwv li, Shore D durometers nquag ua haujlwm los ntsuas qhov hardness ntawm high-density polyethylene, qhia txog lawv qhov kev hloov mus rau ntau yam kev xav tau.