Investment casting process and characteristics and application

Soluble film forging is made with fusible materials model, and on the model smearing refractory material, the hardening, the model melting discharge type outside, so as to achieve no parting surface mold, mold after roasting is pouring.Investment casting equipment
First.A process
1 .wax pattern making
1) .pressure type: system wax pattern of special moulds, steel copper aluminum cutting and become
2). wax mold pressing: paraffin wax, stearic acid, peak, rosin, etc., will be melting wax material pressure into the pressure type, condensing after take out, the deburring, get wax pattern
3). wax mold assembly: some wax mold welding in a sprue bar.
2 .crust: wax pattern with coating, hardening drying
1). dip coating (quartz powder + binder paste) the surface is bright and clean
2). and sand (coarse quartz sand) purpose: thickening type shell
3) .sclerosis (water glass + NH4CL - SIO2) chemical hardening
3 .lost wax roasting
1). lost wax: hot water or steam
2). roasting: heating 800 ~ 1000 ℃ progress type shell strength
4 .sand filling: pouring
1). sand filling: type shell in the iron box, near dry sand filling
2). pouring: strike (600 ~ 700 ℃) were pouring
5 .shakeout cools, PoHuaiXing shell, take out casting, go to gate, burr, annealing or normalizing, in order to obtain the required mechanical function.
Second. characteristics and application
1. forging precision, high degree of finish, and pouring shape complicated parts
2. can forging various alloy (type shell is high-grade refractory materials)
3. units, and small batch and mass produce all can
4. little, no cutting processing (RA3.2 ~ 1.6 UM) a little ground
5.your materials, process multifarious, produce cycle is long
Application: use high melting point alloy precision casting batch, a large number of fruit shape, complicated, difficult to machining of small parts. Such as: steam turbine blade, handicrafts.