可摘局部义齿的金属支架,通常采用分级多铸道浇铸。为了求得浇铸完全,可以同时设置贯通排气孔或盲端排气孔。但是分级多铸道的安插并非完美,首先因熔化液态金属互相湍流给铸件造成砂孔、气孔、表面粗糙和浇铸不足等缺陷,影响铸件的质量。其次,多铸道分布散,只要个别铸道位置不够恰当,或者因铸道细,在覆盖包埋料时稍有不慎,易发生折断,都会出现铸件浇注不全的后果。此外,在切割铸道、磨平、抛光等费时耗料。为此,我们设计一种新的带模铸道——螺旋形单铸道。 Removable partial denture metal stent, usually using multi-level casting casted. In order to find the casting is complete, you can also set through the exhaust hole or blind end vent. However, the graded multi-cast placement is not perfect. Firstly, defects such as sand holes, air holes, surface roughness and insufficient casting are caused by the turbulent flow of molten liquid metal to each other, which affects the quality of the castings. Second, the distribution of more scattered cast, as long as the individual casting location is not appropriate enough, or due to the fine casting Road, buried in the coverage of the material when a little careless, easy to break, there will be casting the consequences of incomplete casting. In addition, cutting cast, grinding, polishing and other time-consuming materials. To this end, we design a new die-casting - spiral single casting.