Feem ntau, thaum cov chaw lag luam yuav cov tshuab txhaj tshuaj molding, lawv xaiv lub tshuab txhaj tshuaj molding nrog qhov tsim nyog ntim ntim raws li qhov hnyav ntawm lawv cov khoom. Tab sis muaj coob tus neeg tsis to taub qhov theoretical txhaj ntim ntim, theoretical txhaj ntim, thiab qhov tseeb txhaj ntim yog muab los ntawm qee qhov kev txhaj tshuaj molding tshuab manufacturers. Tam sim no, txoj kev suav ntawm cov ntaub ntawv no thiab kev nkag siab zoo ntawm yuav ua li cas xaiv lub tshuab txhaj tshuaj molding raws li cov khoom yas.
Kev taw qhia yog raws li nram no:
1. Theoretical txhaj ntim thiab theoretical txhaj ntim ntim
Lub theoretical txhaj ntim yog xam raws li tus nqi tsim, tus qauv yog V= π/4 Ds2*S (formula 1) V-ntawm qhov txhaj tshuaj ntim cm3Ds-ntsia taub txoj kab uas hla cmS-injection stroke cm
Lub theoretical txhaj ntim yog sib npaug rau qhov theoretical txhaj ntim muab faib los ntawm qhov ntom ntawm cov yas ntawm qhov kub thiab txias:
G=VXρ (Formula 2)
G-theoretical txhaj tshuaj ntim g
V-theoretical txhaj tshuaj ntim cm3
ρ- yas ntom ntawm chav tsev kub g / cm3
Raws li cov yam ntxwv ntawm polystyrene (ps) yas, nws tus nqi ceev feem ntau yog siv raws li tus qauv xam: qhov ceev ntawm ps ntawm chav tsev kub yog 1.05g / cm3. Piv txwv li, 160F tshuab nyob rau hauv lub tuam txhab cov khoom version muaj ib tug theoretical txhaj ntim ntawm 307cm3, thiab theoretical txhaj ntim yog 307 × 1.05=322.4g
2. Qhov tseeb txhaj tshuaj ntim thiab txhaj tshuaj ntim
Qhov ntim xav tau rau txhua qhov kev txhaj tshuaj yog tau los ntawm kev sib npaug ntawm qhov hnyav ntawm txhua qhov kab noj hniav los ntawm cov kab noj hniav, ntxiv rau qhov hnyav ntawm lub rooj vag thiab ntws, thiab muab faib los ntawm qhov ntom ntawm cov yas ntawm pwm kub: V{{0} } G/ρdeposit Xη (Formula 3) V-theoretical txhaj tshuaj tso nyiaj cm3G-qhov siab tshaj plaws txhaj tshuaj ntim gρ-qhov ceev ntawm cov yas ntawm molding kub g/cm3η-efficiency kev nyab xeeb ntawm bolting apron
Kev txiav txim siab tias cov yas yaj ntws rov qab ua ntej lub nplhaib roj hmab kaw thiab nrog qhov sib txawv ntawm lub nplhaib roj hmab thiab lub thoob thaum lub sijhawm txhaj tshuaj, qhov kev nyab xeeb η suav nrog. Rau feem ntau cov yas, η yog {{0}}.97, rau nylon η yog 0.95.
Tam sim no, txhaj tshuaj ntim thiab ntim ntim tau cim rau hauv lub tuam txhab txhaj tshuaj molding tshuab F3, F3J, PVC, PET thiab lwm yam khoom lag luam catalogs tau txais raws li cov qauv saum toj no thiab cov qauv polystyrene ntom ntom. Piv txwv li: 160F2 tshuab, txhaj tshuaj ntim V=329cm3, ntom khub ρ yaj=0.93g/cm3, ξ=0.97 ntawm lub melting kub ntawm ps, xam los ntawm formula (3 ), qhov siab tshaj plaws txhaj tshuaj ntim yog 296g.
Rau polystyrene (PS), lwm txoj kev suav empirical rau qhov ntim tshuaj tiag tiag yog muab cov theoretical txhaj ntim los ntawm cov coefficient thiab muab nws los ntawm qhov ntom ntawm polystyrene ntawm chav tsev kub:
G=V×ρ×
G - qhov siab tshaj plaws txhaj tshuaj ntim g
V-theoretical txhaj tshuaj ntim cm3
Qhov ceev ntawm ρ-ps ntawm chav tsev kub yog 1.05g / cm3
-coefficient
Raws li kev lag luam hauv teb chaws tus qauv JB/T7267.94, tus nqi ntawm yog 0.85
