1. Pre-foaming and molding
Since the thickness of the heat sink of the motor shell is 5 mm, the size of the original EPS bead should also be small. ZHY Casting adopts the Dragon King p-s/p-4s model. Due to the many and thin fins, the pre-launch density should be controlled at 25-26 g/L. Electric heating is used for pre-release to ensure uniform size and low moisture content of pre-release beads.
The special hydraulic semi-automatic forming machine for motor housing is used for foam forming. The equipment size is 2.6 m long, 2.6 m wide and 9 m high. The maximum installation mold size is 2.3 m long and 2.3 m wide. After the completion of automatic feeding, other processes are automatically completed by the equipment control system, which can ensure the consistency of white mold quality.
2. Drying
After the model comes out, it cannot enter the drying room immediately. It should be placed on the storage rack in the forming area, and then enter the drying room after the moisture on the surface is roughly evaporated and inspected. The advantages of this method are: first, the moisture content of the white mold just made is very high. If it is directly put into the drying room, the humidity in the drying room will remain high; Second, the waste products can be picked out and discarded directly during inspection, which will reduce the occupation of drying room space. The drying temperature of white mold is 40~45 ℃, and the drying time is 48 h.
3. Combination
(1) The foam pattern shall be fully dried, weighed one by one, and isolated beyond the specified range.
(2) Check the fins one by one, and repair or isolate the fins that do not meet the appearance requirements, generally 10 mm × Defects within 10 mm shall be repaired with white mold special repair paste.
(3) Single-piece casting process is adopted, and the non-drive end is above.
(4) The pouring system uses hot melt adhesive to bond the joint surface. On the premise of meeting the requirements of bonding during operation, it is necessary to use less adhesive as far as possible, adhere firmly and seal tightly with masking paper. Figure shows the combined white model.
