基于SLS管箍零件的覆膜砂铸型制造

Precoated Resin Sand Direct Casting Mold of Pipe Hoop Based on Selective Laser Sintering

通过应用CAD、Pro/E、Magics等软件对管箍零件几何模型"求逆",完成"反求"铸型型腔面的转换,再配以铸造浇、冒口系统,生成管箍零件铸造用模型,采用优化过的工艺参数,用SLS技术直接烧结覆膜树脂砂材料,制成管箍零件覆膜砂铸型,再经加热固化处理后,铸型强度及形状精度、尺寸精度和表面精度都可满足精密铸造工艺要求,最终可以应用于实际生产加工。

The geometrical model of pipe hoop is made in the software environment of CAD,Pro/engineer and Magic by inversion.In this software environment,the mold cavity surface can be reversed and converted based on its casting model designed in advance under the mould-design module,then adding running channel and casting head,the casting molds are completed.Applying the optimized processing parameters of selective laser sintering,the precoated sand is sintered to form sand mold of pipe hoop.By hest-curing process,the shape precision,dimensional precision and surface precision of sand mold could meet the requirements of general structure in investment casting.Finally,this technology and pipe hoop can be used for actual production.