Lost foam casting (solid casting tia hriat bawk) hi casting method thar a ni a, chutah chuan paraffin emaw foam model emaw chu casting nen a inang chiah chiah a, model cluster-ah an inzawm khawm a, refractory paint hmanga coated leh dried an ni a, chutah chuan dry quartz sand-ah phum a ni a, molding atan vibrate-in, negative pressure hnuaiah, casting chu model-a cast-te’n an leih chhuah theih nan an leih a, chu chu an taksaah an dah a ni. Solidification leh cooling hnuah casting a lo awm a.
Lost foam casting a thatna te .
Casting hian precision sang tak a nei a, process thar a ni a, allowance leh forming chiang tak tak a awm a, chiang takin a siam thei. He process hian mold removal a mamawh lo va, parting surface a nei lo a, chuvangin sand core. a awm lo a, chuvangin, casting hian flash, burrs, draft angle a nei lo a, core combination atanga dimensional error awm te a ti tlem bawk.
Casting-a surface roughness chuan RA3{2}2 to 12.5μm. casting-te dimensional accuracy chu CT7-ah a thleng thei a, machining allowance sang ber chu 1.5 to 2mm a ni a, hei hian mechanical processing man a tihtlem phah thei a ni. Traditional sand casting method nen khaikhin chuan mechanical processing time chu 40% atanga 50% in a tihtlem thei a ni.
Design chu a flexible a, casting structural design atan zalenna tling a pe thei. Highly complex castings chu foam plastic mold sheets. inzawmkhawmin cast theih a ni.
Traditional casting-ah hian sand core a awm lo a, chuvangin sand core size dik lo avanga casting wall thickness inang lo emaw, traditional sand casting-a ang khan core placement dik lo emaw a awm dawn lo.
Thianghlim taka siam, molding sand-a chemical binder awm lo, foam plastic hi temperature hniam takah chuan boruak tan a hlauhawm lo va, sand hman tawh recovery rate chu 95%. aia tam a ni.
Investment leh production cost tihtlem te, casting blank rit te tihziaawm te, machining allowance tlem te. nei.
Foam Casting Process Flow a hloh a ni.
1. Foam plastic vaporization mold (manual, mechanical) siam;
2. Foam plastic chu a vaporize a, mold te chu an inzawm khawm a, chutah chuan an vawt tir.
3. Foam plastic gasification mold chunglam chu refractory paint hmanga khuh a, spray a nih hnuah chuan a vawt leh (a vawt vek tur a ni).
4. A bik taka siam sand box chu three-dimensional vibrating table-ah dah rawh.
5. Base sand (dry sand) chu fill up la, compact la, level rawh.
6. dried foam plastic vaporization mold chu base sand-ah dah la, process mamawh angin sand filling-ah then la, hun engemaw chen chu automatic-in vibrate la, chutah chuan box hawnna chu level rawh.
7. Sand box hawnna chu plastic film hmangin khuh la, a chungah chuan pouring cup chu dah la, negative pressure system-ah dah la, compaction hnuah chuan molten steel chu cast. foam plastic vaporization mold chu a bo a, molten metal chuan a hmun a luah.
8. Casting a solid tawh hnuah vacuum chu thlah la, box chu han herh leh la. Casting chu la chhuak la, cycle dang ah kal rawh.
Sand enkawlna kalphung flow .
Box flipping machine chuan sand box, sand leh castings chungah → sand chu sand drop hopper-ah a rawn lut a (castings chu crane leh cross-span flat car-in a phurh chhuah a ni) → Sand quantitative gate valve chu . Bucket elevator (heat-resistant belt) → NO. 2 Sand Temperature regulator (9 groups) →Sand quantitative gate valve → NO. 5 Bucket elevator → NO. 1 Belt Conveyor → NO{15} NO{15} Belt Conveyor → NO{. 3 A rilru a buai em em a, a rilru a hah em em bawk a.
Transition sand silo chu NO. 1 sand temperature regulator. hmaah dah a ni a, chu chu sand dropping process laiin, sand dropping point atanga transition sand silo thlenga area chu equipment line zawng zawng a kal awlsam theih nan a inhawng a ni.
