Ihe nkedo ịkpụ aja na-eme ka onwe ya sie ike ma ọ bụ nkedo aja na-adịghị esi nri bụ nke otu ụdị nkedo aja nke nwere mkpuchi resin ma ọ bụusoro nkedo shei ebu. Ọ na-eji ihe nkedo kemịkalụ na-agwakọta na ájá wee mee ka ha sie ike n'onwe ha. N'ihi na ọ dịghị usoro tupu okpomọkụ dị mkpa, usoro a na-akpọkwa no-bake ájá ịkpụzi usoro nkedo.
Aha no-bake sitere na mmanụ-oxygen onwe-hardening nke Swiss chepụtara na mbido 1950, ya bụ, a na-agbakwunye mmanụ nkụ dị ka mmanụ linseed na mmanụ tung na ihe ndị na-emepụta ígwè (dị ka cobalt naphthenate na aluminum naphthenate) na oxidant. (dị ka potassium permanganate ma ọ bụ sodium perborate, wdg). N'iji usoro a, isi ájá nwere ike ime ka ike sie ike maka ike a chọrọ maka ntọhapụ ebu mgbe echekwara ya ruo ọtụtụ awa na ụlọ okpomọkụ. A na-akpọ ya hardening ụlọ okpomọkụ (Air Set), hardening self (Self Set), oyi hardening (Cold Set) na ndị ọzọ. Ma, ọ erubeghị ezigbo onwe-hardening, ya bụ, ọ dịghị mmiri (Ọ dịghị ime), n'ihi na okokụre ebu (isi) kwesịrị ka akpọnwụwo ruo ọtụtụ awa tupu agbapụtara iji nweta zuru hardening.
"Ajá na-eme ka onwe ya sie ike" bụ okwu pụtara mgbe ụlọ ọrụ na-emepụta ihe nakweere ihe nkedo kemikal, ihe ọ pụtara bụ:
1. N'ime usoro ngwakọta ájá, na mgbakwunye na ịtinye ihe nkedo, a na-agbakwunye ihe na-eme ka ike sie ike (hardening) nke nwere ike ime ka ihe ahụ sie ike.
2. Mgbe ịkpụzi na isi na-eme ụdị ájá a, ọ dịghị ọgwụgwọ (dị ka ihicha ma ọ bụ ịfụ gas siri ike) na-eji mee ka ebu ma ọ bụ isi sie ike, na ebu ma ọ bụ isi nwere ike isi ike n'onwe ya.
Site na ngwụcha afọ 1950 ruo na mmalite 1960s, ezigbo usoro ịgbake onwe onye na-enweghị oven ka ejiri nwayọọ nwayọọ mepụta ya, ya bụ, acid-cured (catalyzed) furan resin ma ọ bụ phenolic resin self-hardening usoro, na usoro mmanụ urethane na-eme ka onwe ya bụrụ nke e mepụtara n'ime ya. 1965. E webatara usoro phenolurethane onwe-hardening na 1970, na phenolic ester. usoro nke siri ike nke onwe pụtara na 1984. Ya mere, echiche nke "ájá na-edozi onwe ya" na-adaba na ájá na-emepụta ihe na-eme ka mmiri sie ike, gụnyere ájá mmanụ na-edozi onwe ya, ájá mmiri mmiri, ájá ciment, ájá aluminom phosphate bonded na ájá resin.
Dị ka igbe oyi na-ejide onwe ya, ájá resin furan bụ nke mbụ na nke a na-ejikarị eme ihe ugbu a.Ụlọ ọrụ ndị China. Ọnụ ego resin agbakwunyere na ájá ịkpụzi na-abụkarị 0.7% ruo 1.0%, na ọnụ ọgụgụ resin agbakwunyere na isi ájá bụ 0.9% ruo 1.1%. Ọdịnaya nke aldehyde efu na resin furan dị n'okpuru 0.3%, ụfọdụ ụlọ ọrụ agbadala n'okpuru 0.1%. N'ebe a na-emepụta ihe na China, ájá na-agbapụta onwe ya na-esi ísì ụtọ eruola ọkwa mba ụwa n'agbanyeghị usoro mmepụta na ọdịdị elu nke nkedo.
Mgbe agwakọtachara ájá mbụ (ma ọ bụ ájá eweghachitere), resin mmiri mmiri na ihe na-akpali akpali nke ọma, na-ejuputa ha n'ime igbe bụ isi (ma ọ bụ igbe ájá), wee mechie ya ka ọ sie ike n'ime ihe ebu ma ọ bụ ebu na igbe igbe (ma ọ bụ igbe ájá). ) n'ime ụlọ okpomọkụ, a na-emepụta ihe nkedo ma ọ bụ ihe nkedo, bụ nke a na-akpọ onwe-hardening cold-core box modeling (isi), ma ọ bụ usoro nkedo (isi). Enwere ike ikewa usoro nke siri ike nke onwe ya gaa na resin furan acid-catalyzed na usoro phenolic resin sand nke onwe ya, usoro urethane resin sand nke onwe na usoro phenolic monoester onwe-hardening.
Njirimara ndị bụ isi nke usoro nkedo ịkpụzi onwe ya bụ:
1) Mma akụkụ ziri ezi nkeihe nkedona elu roughness.
2) Ịdị ike nke ebu (isi) ájá adịghị achọ ihicha, nke nwere ike ịzọpụta ike, a pụkwara iji osisi na-adịghị ọnụ ma ọ bụ plastic isi igbe na ndebiri.
3) ájá ịkpụzi onwe ya dị mfe ịgbakọ na daa, ọ dị mfe ikpochapụ ihe nkedo, na ájá ochie nwere ike ịmegharị ya ma jiri ya mee ihe, nke na-ebelata oke ọrụ nke ime isi, ịme ihe ngosi, ájá dara, ihicha na njikọ ndị ọzọ, na ọ dị mfe ịghọta mechanization ma ọ bụ akpaaka.
4) The uka akụkụ nke resin na ájá bụ naanị 0.8% ~ 2.0%, na keukwu na-eri nke akụrụngwa dị ala.
N'ihi na usoro nkedo nke siri ike nke onwe ya nwere ọtụtụ uru ndị a kpọtụrụ aha n'elu, a na-eji ihe nkedo ájá na-eme ka ọ sie ike ọ bụghị nanị maka ime isi, kamakwa iji mee ihe nkedo. Ọ na-adabara nke ọma maka otu mpempe akwụkwọ na obere ogbe mmepụta, ma nwee ike ịmepụta ihe nkedo, nkedo ígwè naihe nkedo alloy na-abụghị nke ígwè. Ụfọdụ ebe a na-emepụta ihe ndị China anọchiwo kpam kpam ihe ndị e ji kpụọ ájá kpọrọ nkụ, ájá simenti, ma dochie akụkụ ájá nke ugegbe mmiri.
Oge nzipu: Jan-21-2021