| 摘要 |
PURPOSE:To join both metals with excellent adhering force by making the specific ratio of recessed part diameter in rear face of the preceding metal bar to projecting part diameter in front end face of the following metal bar at the time of connecting the rear end of preceding metal bar with the front end of the following metal bar for supplying into a vacuum melting furnace. CONSTITUTION:The metal bar 9a for vacuum deposition is inserted in the vacuum melting furnace 1 for executing vacuum deposition, etc., and melted with the heat source 3 of electron gun, etc., and stored into a crucible 5 as molten metal and used for the evaporation. When the preceding metal bar 9a is made to short length by melting, it is connected with the following metal bar 9b. Therefore, the recessed part 28 having the diameter d1 is formed at the rear end face of the preceding metal bar 9a and the projecting part 29 having the diameter d2 is formed at the front of the following metal bar, and the projecting part 29 is fitted to the recessed part 28. In this case, by deciding so as to have the relation between d1 and d2 satisfying the inequality I, when the following metal bar 9a advances and approaches to the vacuum melting chamber 1, it is heated and expanded, and the projecting part 29 is strong stuck and joined into the recessed part 28 under fitting condition, and the remained part of the shortened preceding metal bar 9a is dropped into the molten 4 and splash is developed and the temp. of molten metal 4 is not developed. |
