The process of rapid manufacturing of zinc-based alloy plastic molds

Update:27-06-2018
Summary:

The process of rapid manufacturing of zinc-based alloy […]

The process of rapid manufacturing of zinc-based alloy plastic molds ranges from the computer 3D design of plastic products to the rapid manufacturing process of zinc-based alloy molds.

    Product prototypes and prototypes of access to plastic products for silicone armature molds were fabricated on the HRP-3 thin-sheet laminate manufacturing (LOM) rapid prototyping machine developed by Huazhong University of Science and Technology. Injection mould First, the product is 3D-designed using Pro-E or UG software, and the slice information is then hierarchically generated along the height direction and input into the rapid prototyping machine. The LOM machine cuts the paper coated with hot melt adhesive according to the profile information of the part and pastes them layer by layer with a heating roller. Finally, the waste is removed and processed to obtain a paper prototype of the product. Compared with other rapid prototyping methods, LOM prototypes have a faster forming speed, lower material costs, and higher post-processing forming accuracy and surface quality.

    The surface-treated paper is used as a master mold of a silicone rubber mold and placed in a mold frame. The imported non-shrinking silicone rubber and the hardener are mixed and poured into the mold, and the vacuum injection machine is used for defoaming.

    After being taken out and left for 24 hours at room temperature, the silicone rubber is completely hardened, and the silicone rubber is cut in accordance with a predetermined parting surface to obtain a silicon rubber mold of the product. The silicone rubber mold has the same shape as the metal mold finally required to be obtained. Due to its good elasticity, it is very suitable as an intermediate transition mold for making metal molds. The duplication of the silicone rubber mold is very good, it can copy the very fine parts of the prototype, reducing the loss of the shape and dimensional accuracy in the intermediate conversion process, and it is more favorable for the mold production of plastic products. The strength of silicone rubber can completely withstand the styling operation of the later casting process, and demoulding is very easy. It can be used as a master mold to manufacture multiple pairs of molds, and is an ideal material for the middle mold for casting.

    The rapid casting mold production of the mold is the most critical part of the rapid mold making process. On the one hand, the mold should maximize the shape, accuracy and surface quality of the prototype; on the other hand, it must meet the requirements of the subsequent Commodity mould casting process and reduce the Casting defects occur with the chance to improve the quality of castings. The process of rapid casting with silicone rubber molds is gypsum type, ceramic type, transfer coating method and so on. Ceramic casting has high cost, complicated process and difficult to grasp. The gypsum type is easy to make, but the strength of the mold is low, the solidification rate of the molten metal is slow, and casting defects such as shrinkage holes are likely to occur.molds ranges from the computer 3D design of plastic products to the rapid manufacturing process of zinc-based alloy molds.