| 摘要 |
PURPOSE:To facilitate manufacture of a lost wax pattern and to reduce the labor by integratedly forming a runner part extending from a main body part made of expandable synthetic resin and an engaging part fitting the runner part to a runner tube for molten metal passage with the main body part. CONSTITUTION:The runner tube 10 is invested in a sand mold and used to the molten metal passage and made to cylindrical shape with heat resistant metal or ceramic, etc., and conical shape at the upper end fixed to a bottom plate 12 at the lower end to stably support the runner tube 10. Further, plural inserting holes 13 penetrating the tube wall are arranged at side part. On the other hand, the lost wax pattern forms the pattern main body 14 corresponding to the casting and a gate 15 integratedly set with the pattern main body 14 and a stopper 16 for connecting the pattern main body 14 with the runner tube 10 by engaging with the inserting hole 13 in the runner tube 10 at the tip part thereof. Therefore, the lost wax pattern is fitted to the pattern main body 14 by engaging the stopper part 16 with each inserting hole 13 and can be used by investing in the sand as a tree. |
