Cov ntsiab lus ntawm kev sib tsoo log

Sib tsoo log yog lub cev ntxeem tau ua los ntawm kev sib tsoo thiab khi los ntawm kev npliag nias, ziab thiab sintering. Abrasive, binder thiab cua qhov yog peb lub ntsiab ntawm kev sib tsoo log. Kev ua tau zoo ntawm kev sib tsoo log nyob ntawm tsib yam tsis muaj: abrasive, particle loj, binder, hardness thiab microstructure.

Kuv cov ntaub ntawv Abrasive

Ua haujlwm txiav, nrog siab hardness, hnav tsis kam, kub ua hauj thiab toughness, thiab ntse npoo thiab fab. Feem ntau siv Abrasives muaj xws li oxide system, carbide system thiab siab hardness abrasive system. Lub ntsiab tseem ceeb ntawm oxide abrasive yog A1203, uas tau muab faib ua ntau hom vim nws txawv purity thiab sib txawv hlau ntsiab. Carbide abrasives feem ntau yog ua los ntawm silicon carbide thiab boron carbide, uas kuj tau muab faib ua ntau hom vim txawv purity ntawm cov ntaub ntawv. Lub superhard abrasive system feem ntau suav nrog pob zeb diamond thiab cubic boron nitride. Cubic boron nitride yog ib qho kev cog lus abrasive. Lub tshav kub tsis kam (1400 degree) yog siab dua li ntawm pob zeb diamond (800 degree), thiab cov tshuaj inertia rau hlau yog siab, yog li nws yog tshwj xeeb tshaj yog haum rau kev sib tsoo nyuaj thiab tawv hlau.

II granularity

Particle size indicates the size and degree of abrasive particles. The particle size of abrasive particles is expressed by the mesh number of the screen that abrasive particles can just pass through. The particle size number is expressed by the number of sieve holes per inch length. The larger the particle size number, the smaller the particle size; Size less than 40 μ M, the particle size number is represented by W before its actual size. Metric units are adopted in China's new standard, and the size of abrasive particles is uniformly expressed by the size in the direction of the maximum size of abrasive particles.

Xaiv txoj cai:

(1) Fine abrasive hais rau kev sib tsoo zoo;

(2) Coarse abrasive hais;

(3) Coarse abrasive hais rau siab - sib tsoo ceev;

(4) Thaum cov khoom siv ua haujlwm yog mos, yas thiab qhov sib tsoo loj, txhawm rau kom tsis txhob thaiv lub log sib tsoo, cov khoom sib tsoo tuaj yeem siv tau, thiab cov khoom zoo abrasive tuaj yeem siv rau kev sib tsoo zoo lossis cov khoom tawv tawv.

III Bond

Lub luag haujlwm ntawm binder yog txhawm rau sib txuas cov khoom abrasive ua ke kom lub log sib tsoo muaj qhov tsim nyog thiab lub zog. Common sib tsoo log binders yog:

(1) Ceramic binder (code V) yog npaj los ntawm cov ntaub ntawv ceramic xws li av nplaum, feldspar, talc, boron iav thiab silica. Nws yog tus cwj pwm los ntawm cov khoom siv ruaj khov, dej tsis kam, acid tsis kam, kub tsis kam thiab tus nqi qis, tab sis nws yog nkig. Tsuas yog txiav cov log sib tsoo, feem ntau cov log sib tsoo siv cov hlua khi ceramic. Lub linear ceev ntawm kev sib tsoo log feem ntau yog 35m / s.

(2) Resin bond (code B) feem ntau yog tsim los ntawm phenolic resin, tab sis epoxy resin kuj tseem siv tau. Resin daim ntawv cog lus muaj lub zog siab thiab zoo elasticity, yog li nws feem ntau yog siv nyob rau hauv siab - ceev sib tsoo, txiav thiab slotting. Txawm li cas los xij, qhov kub tsis kam ntawm resin daim ntawv cog lus tsis zoo. Thaum qhov sib tsoo kub nce mus txog 200-300 degree, nws lub peev xwm sib txuas yuav raug txo kom tsawg. Ua kom zoo dua ntawm cov yam ntxwv uas cov khoom abrasive yog ib qho yooj yim kom poob tawm thiab nthuav tawm cov ntse tshiab abrasive hais (tus kheej sharpening) thaum nws lub zog txo, resin binder tuaj yeem siv rau hauv qee cov txheej txheem uas tshwj xeeb tshaj yog rau kev sib tsoo kub thiab sib tsoo tawg (xws li. Raws li kev sib tsoo nyias-walled qhov chaw, ultra precision sib tsoo lossis sib tsoo cemented carbide, thiab lwm yam).

(3) Feem ntau cov roj hmab khi (code R) siv cov roj hmab dag. Roj hmab daim ntawv cog lus yog elastic dua li resin daim ntawv cog lus, uas yuav ua rau lub sib tsoo log muaj zoo polishing nyhuv. Nws yog tsuas yog siv los ua kev taw qhia lub log ntawm lub tshuab tsis muaj kev sib tsoo thiab txiav, slotting thiab polishing sib tsoo lub log. Txawm li cas los xij, nws tsis haum rau kev sib tsoo lub log sib tsoo.

(4) Cov hlau sib txuas (code m) yog bronze daim ntawv cog lus, uas yog siv los ua pob zeb diamond sib tsoo log. Bronze bonded pob zeb diamond sib tsoo log yog tus cwj pwm los ntawm qhov zoo formability, siab zog thiab tej yam toughness, tab sis tsis zoo nws tus kheej sharpening. Nws yog tsuas yog siv rau kev sib tsoo ntxhib, semi zoo sib tsoo ntawm cemented carbide thiab txiav cov iav kho qhov muag, ceramics, semiconductors, thiab lwm yam.

IV hardness

Lub hardness ntawm kev sib tsoo log qhia txog qhov nyuaj ntawm cov khoom abrasive ntog tawm ntawm qhov sib tsoo log nyob rau hauv qhov kev txiav txim ntawm kev sib tsoo quab yuam. Yog tias lub log sib tsoo nyuaj, nws txhais tau hais tias cov khoom abrasive yog qhov nyuaj rau poob; Lub log sib tsoo mos qhia tias cov khoom abrasive yooj yim poob. Lub hardness thiab softness ntawm kev sib tsoo log thiab abrasive lis yog ob lub ntsiab lus sib txawv. Thaum xaiv lub log sib tsoo, xyuam xim rau qhov tsim nyog hardness. Yog hais tias lub log sib tsoo nyuaj heev, cov khoom tsis zoo ntawm cov abrasive yuav tsis poob rau lub sijhawm, ua rau muaj kev sib tsoo loj heev thiab cov khoom ua haujlwm kub hnyiab; Yog hais tias nws yog mos heev, cov khoom abrasive yuav poob sai heev thiab tsis tuaj yeem ua rau nws lub luag haujlwm txiav. Thaum xaiv qhov hardness ntawm kev sib tsoo log, cov hauv qab no tuaj yeem raug xa mus rau:

(1) Lub hardness ntawm lub workpiece yog harder lub workpiece cov ntaub ntawv, lub softer lub hardness ntawm lub sib tsoo log yuav tsum tau, thiaj li hais tias lub blunt abrasive nplej yuav poob sai sai, thiaj li hais tias lub sib tsoo log yeej ib txwm ua kom ntse abrasive nplej ua hauj lwm, yog li ntawd. raws li kom tsis txhob kub hnyiab ntawm lub workpiece vim kev sib tsoo kub heev. Lub softer lub workpiece cov ntaub ntawv yog, lub hardness ntawm lub sib tsoo log yuav tsum yog, thiaj li hais tias cov nplej abrasive yuav poob maj mam, thiaj li muab tag nrho plays lub luag hauj lwm ntawm abrasive nplej. Txawm li cas los xij, kev sib tsoo tsis yog kub Rau cov khoom muag muag xws li, roj hmab thiab cov resin, lub log sib tsoo yuav tsum raug xaiv kom tsis txhob muaj qhov sib tsoo ntawm qhov sib tsoo los ntawm kev sib tsoo cov khib nyiab.

(2) Thaum qhov sib chwv ntawm lub log sib tsoo thiab lub tshuab ua haujlwm loj, lub log sib tsoo yuav tsum raug xaiv los ua kom cov khoom abrasive poob sai dua, kom tsis txhob muaj qhov kub hnyiab los ntawm kev sib tsoo cov khib nyiab thaiv qhov sib tsoo ntawm qhov chaw. . Thaum lub sij hawm lub voj voog sib tsoo thiab xaus lub ntsej muag tiaj tus sib tsoo, lub hardness ntawm lub sib tsoo lub log yuav tsum qis dua qhov sib tsoo ntawm lub voj voog sab nrauv. Thaum sib tsoo nyias- cov phab ntsa thiab cov khoom ua haujlwm nrog cov thermal conductivity tsis zoo, lub hardness ntawm lub log sib tsoo yuav tsum qis dua.

(3) Kev sib tsoo kom tiav thiab daim ntawv sib tsoo thaum lub sij hawm ua tiav kev sib tsoo thiab daim ntawv sib tsoo, lub log sib tsoo nyuaj yuav tsum raug xaiv los tuav cov khoom tsim nyog ntawm lub log sib tsoo.

(4) Qhov loj dua qhov me me ntawm qhov sib tsoo lub log, qhov qis dua qhov hardness yuav tsum raug xaiv kom tsis txhob muaj cov qauv ntawm lub log sib tsoo raug thaiv los ntawm kev sib tsoo cov khib nyiab.

(5) Lub tshav kub tsis kam ntawm binder resin binder yog qhov tsis zoo, thiab cov khoom abrasive yooj yim poob, yog li lub hardness yuav tsum siab dua.

V lub koom haum

Cov qauv ntawm kev sib tsoo log qhia txog kev sib raug zoo ntawm cov khoom abrasive, binder thiab pores. Qhov loj dua qhov kev faib ua feem ntawm cov khoom abrasive nyob rau hauv tag nrho cov ntim ntawm lub sib tsoo log, lub tighter tus qauv ntawm lub sib tsoo log thiab qhov me me ntawm cov cua qhov; Ntawm qhov tsis sib xws, qhov me me ntawm qhov sib piv ntawm cov khoom abrasive, lub looser tus qauv thiab qhov loj ntawm qhov pores.

Lub koom haum qib ntawm kev sib tsoo log tuaj yeem muab faib ua peb pawg: compact, nruab nrab thiab xoob. Lub subdivision tuaj yeem muab faib ua 15 qib. Lub koom haum naj npawb tuaj yeem nkag siab tias yog porosity. Lub compact sib tsoo log yog haum rau kev sib tsoo nyob rau hauv hnyav hnyav. Nyob rau hauv daim ntawv sib tsoo thiab precision sib tsoo, lub sib tsoo sib tsoo log muaj peev xwm tuav lub formability ntawm lub sib tsoo log thiab tau tsawg roughness. Cov qauv nruab nrab sib tsoo lub log yog tsim rau kev sib tsoo ua haujlwm, xws li quenching steel sib tsoo thiab cov cuab yeej sib tsoo. Cov qauv xoob ntawm lub log sib tsoo tsis yooj yim rau kev thaiv. Nws yog qhov tsim nyog rau kev sib tsoo nto, kev sib tsoo sab hauv thiab lwm yam txheej txheem nrog kev sib tsoo loj hauv cheeb tsam, nrog rau kev sib tsoo kub rhiab heev.