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在生产小批量铸件时,我厂常以木模代替金属模。为提高木模表面的平整光洁程度,一般要在其表面上涂一层石蜡,但在造型时,砂粒会渗入石蜡和木模表面缝隙处,使型砂粘结在模样上,拔模时,会发生垮砂现象。若在木模上涂一层环氧树脂粘结剂,情况就会有所好转。因为环氧树脂粘结剂能够牢固地粘结在模样表面,形成一个十分光洁的硬外壳。我厂使用的泰山一25壳体木模,在未涂这种粘结剂时,垮砂现象严重。在施涂粘结剂以后,效
In the production of small quantities of castings, I often use wood instead of metal molds. In order to improve the flatness and smoothness of the surface of the wood mold, a layer of paraffin wax is generally applied on the surface of the wood mold. However, when molding, the sand will infiltrate into the gap between the wax and the surface of the wood mold to make the sand adhere to the mold surface. Occurrence of sand collapse phenomenon. If the wood mold coated with an epoxy adhesive, the situation will be better. Because the epoxy resin adhesive can be firmly bonded to the surface of the sample, forming a very smooth hard shell. Taishan plant I use a 25 shell wood mold, in the uncoated binder, sand collapse phenomenon. After applying the binder, the effect