Wax filling discontent, the main reason is the wax material through the low temperature, injection speed, pressure and temperature is low, cause the wax in the course of cooling fast, thin-walled Department filled in the corner and edgedepartment or wax, edges and corners of the place on the corner, this kind of circumstance and metal casting
Misrun is very similar to the. Wax surface depression, is mainly the injection pressureand the lack of time, or wax material at high temperature, cooling time, sometimesfrom the type of release agent caused too much, surface depression relates to a larger area, repair is difficult, easy to cause the waste. The main reason
If the pressure is not precise enough, pressure type surface or interior joint surfacedamage or attached dirt, or locking force is not enough, the injection pressure is too high. Lines deep, cold septal defect similar metal castings; there is in the vicinity of the core, near the hole, and sometimes can be seen joint,
Slightly concave, is located at the junction of two shares of wax flow and not very goodfusion, which is the wax temperature is not enough, lack of pressure results.
Wax has flash, this is a kind of the most common defects, namely in the pressure type,joint pressure type combined block, the core and the core seat connecting places likea wax work very thin. Fin must be completely removed, wax to use. Investmentbubbles, one kind is with the naked eye
Surface bubbles visible, another kind is the wax inside the bubble, usually larger, alsocannot see with the naked eye, but can through local plump wax found, this is because the gas inside the expansion caused by wax. Wax surface wrinkles, becausewax through the low temperature, low rate of fire, wax movement
And with the pressure type temperature improper; or because the pressure insidesurface is damaged or not clean; chill metal block placed improper movement, leavingtraces in the wax surface.
Wax and pressure type adhesive, this is because there is no mold release agent, or wax and pressure type temperature is too high, or the pressure inside the surface is not clean caused by. Wax surface coarse, because injection pressure is too low, orcontact density rate low wax and profiled inner surface is not enough, serious still
The fold. The temperature is too high or wax. Wax pattern deformation, wax from the die out after, in addition to narrow the size change occurs, and sometimes because ofhis gimmick when inaccuracy caused by deformation; because the wax pattern is common in the cooling of the deflection, so just from the pressure for
The wax pattern still be careful placement, usually with large plane surface, also may be the wax is too soft, resulting in pressure type design is not reasonable etc..