Dai gaw manu dan ai arung arai ni n re, raitim, bungli galaw ai lam n kaja ai, n kaja ai bungli galaw ai, n bung ai n-gun n rawng ai. Batch langai mi gaw, wan hku law ai yuan manu jahpu jaw ra ai, raitim, shut ai lam langai sha nga ai gaw, yawng hpe jahten kau ya lu ai.
Grau nna, vacuum furnaces hpe lang ai shaloi, madu law law gaw san seng ai makau grup yin hte hkrak ai nbung katsi ai lam gaw ra ai lam yawng re ngu sawn la ma ai. Raitim, dai daw ni gaw wan wut kaw na pru wa ai shaloi, ntsa lam gaw htoi tu ai zawn rai nga ai, raitim, jep yu ai shaloi, shanhte gaw n hkum tsup ai n-gun, n bung ai microstructure, hte localized cracks ni hpe pyi mu lu ai... Hpa manghkang nga ai kun?
Kaja wa nga yang, vacuum quenching gaw asan sha zawn rai na re: katsi ai → → hkam la ai, raitim, lahkam shagu hta shi a hkalem hkalau ai lam ni nga ai. Kalang lang sadi n dung ai gaw na a shakut shaja ai lam yawng hpe jahten kau ya lu ai.
1. Loading ladat gaw, langai sha re ai lam hpe hkrak sha hkra machyi shangun ai.
Masha law law gaw, loi ai hku pru wa na lam hpe la nna, daw nkau mi hpe shinggrup nna, shanhte hpe htu bang kau ma ai.Raitim, nang myit yu ga ai kun: nbung lwi ai lam gara hku garan pru wa ai kun? Nonven hku katsi ai gaw, shadowed area hta na katsi ai lam gaw loi loi hte hkrat wa nna, core microstructure gaw n hkum tsup ai galai shai lam hpe hkrum sha ai majaw, n-gun n rawng ai lam n nga mat ai.
Teng ai ladat:
N-gun n rawng hkra, daw ni a lapran hta law law nga ai hpe tawn da u;
Dai hpe jut shagu grup yin hta nbung lwi hkra galaw na matu, lapran kaw galu kaba ai daw ni hte kadun ai daw ni hpe tawn da u;
Tray kata de n-gun rawng ai shara ni hpe n-gun n-gun n-htum hkra, n-gun n-rawng hkra tawn da u.
Ndai gaw laksan n re; dai gaw process ra ai lam re.
2. Lawan ai hku katsi ai hpe hkum hkan tam.
Vacuum langai mi hta, convection n nga ai; heat hpe htawt sit ai lam gaw radiation hku nna sha rai nga ai. Nbung katsi ai lam grai lawan ai hku rawt jat wa ai rai yang, grau nna n-gun ja ai- kaw na prut prut ai daw ni a matu (sh) tsaw ai-alloy steel ni a matu, ntsa na nbung katsi ai gaw katsi ai de du wa ai, kata lam gaw katsi ai-}this hpe "thermal stress" ngu shamying ma ai, dai gaw n-gun rawng ai aten hta loi loi hte htum mat chye ai.
Hpaji jaw ai lam:
Cr12MoV hte H13, shing nrai, bungli galaw ai shara kaba ni zawn re ai mold steel ni a matu, kata lam hte shinggan na nbung katsi ai lam ni hpe maren mara byin hkra, lapran na hkam la ai lahkam ni hpe (ga shadawn, minit 30 daram) jaw ya ai.
atsawm sha katsi mat nna, lahkam n htum hkra koi gam u.
Slow heating gaw teng sha grau shim lum ai.
3. Quenching: N kaja dik ai hte hkrat sum chye ai.
vacuum wan wut law malawng gaw, 0.6 hte 2.0 MPa lapran na n-gun ni hta, n-gun ja ai n-gun ni hta, n-gun kaba ai watrogen (sh) argon hpe lang ma ai. Raitim, factory law law gaw, set values ni hpe sha madung tawn ai, tengman ai mahtai ni hpe sha myit maju jung ma ai.
Manghkang ni hte seng ai:
N law htum ga san san seng ai, oxygen (sh) hka n-gun rawng ai, katsi ai hpe hkra machyi shangun ai hte ntsa lam a hkam kaja lam hpe hkra machyi shangun ai;
Nozzle gaw n bung ai (sh) fan ni a akyu hpe shayawm ya ai majaw, n bung ai hku katsi mat wa ai;
Staged pressure hpe hkang ai lam n nga ai majaw, shawng kaw nna n-gun kaba pru wa ai majaw, daw mi hpe galai shai kau ya lu ai.
Ga nchyan tsun dan ai:
Gas dew point hpe ayan chyam yu nna, katsi ai hpe chye lu na matu;
Hka n htum shi yang, fan hte nozzle a masa hpe jep yu u;
Hpa majaw nga yang, n-gun n law ai shara hta, n-gun n law ai shara hta, n-gun n law ai sha, n-gun n-gun hpe jat nna, phase galai shai ai lam hpe ngut kre hkra galaw na matu, pre{0}}} hpe lang u.
4. Furnace kaw na workpiece hpe n shapraw shi yang grai na hkra hkum la nga.
Dai wan wut ni hkring mat ai shaloi, masha law law gaw, dai daw ni hpe yeng seng kau na matu n hprawng ai sha, "kachyi mi naw galu ai gaw, hkalem hkalau ai lam galaw na" ngu myit la ma ai. Raitim, vacuum furnaces ni gaw kaja ai insulation nga ai, daw ni gaw kata de loi loi hte katsi mat nna, kaja dik htum pre{1}} hpe grau nna katsi shangun lu ai, hpang na hkam sha lam ni hpe hkra machyi shangun ai.
Grau nna ahkyak ai hku nga yang, martensitic structure nkau mi gaw, npu na- aten ladaw grai na hkra naw nga ai, dai gaw loi loi hte n-gun n rawng ai lam ni hpe byin shangun chye ai.
Hpaji jaw ai lam:
Hkap la ngut ai hpang, daw ni hpe n-gun n rawng ai wan wut de lawan dik ai hku htawt bang u; hkum tawn da nna, vacuum furnace hta dung nga ai n-gun n-gun n-gun n-jaw ai.
Parameters ni hpe set galaw ngut ai hpang, kaja ai a matu set galaw da ai ngu hkum sawn la. Material batch, wan wut ai lam galai shai ai lam ni, aten ladaw hte seng ai nbung n bung ai lam ni pyi, hpang jahtum na mahtai ni hpe hkra machyi shangun chye ai.
Hpaga lam nnan ni hte galaw sa wa ai lam nnan ni a batch langai hpra hpe lai di ra ai:
Hardness chyam dinglik ai lam;
Metallurgical sawk sagawn ai lam;
Deformation shadawn shadang;
Ra ai rai yang, ngam nga ai myit ru myit tsang lam hpe chyam dinglik ai lam.
Data gaw shi hkum shi tsun ai.
Hpang jahtum, vacuum furnace gaw san seng ai makau grup yin a akyu ni hpe jaw ya ai, n law htum oxidation, hte n-gun n law ai, raitim, dai gaw shi hkum shi "teng man ai" shut ai lam ni hpe n galaw lu na re.
Kaja dik ai arung arai ni pyi, dai hpe hkrak jai lang na matu masha ni hpe kam hpa nga ai.
