Obviously, only one-sided bronze sword die ram type before to ensure that all the system ram mud Fan can be cast corresponding to the both sides of the same shape and size bronze sword body. When the ram the system out of a group of muddy bronze sword upon dried, calcined ceramic Fan, then Tao bronze sword Fan from the drying kiln, put out to cool to room temperature, arbitrarily remove two the Tao bronze sword range, can be more smoothly to tenon fastening slab of bronze swords, pottery bronze sword Fan pouring out both sides of the corresponding length, width, thickness and geometry, and naturally the same. Hop Fan casting process, there is a flat casting or vertical pouring. The popular bronze of the bronze also has silkworm pattern, fish pattern, tortoises, etc.
Mr. Chinese feel in the casting of bronze swords drawn schematic that bronze swords for Ngok Ministry down, the first upward casting shown in Figure 2. Centerline bronze sword on the left the black line is the set of vent outlet on the right, opened in the shank of the bronze sword. Set the top pouring the type casting process on the grounds that the copper liquid top-down pressure, the flow is too fast, can guarantee the bronze Janus casting. Geometric patterns of the bronze vary on cloud, thunder, raised-nail patterns with some ring patterns, dots, etc. At present, the bronze sword casting process, most of the top cast hold this view (Figure 2). We believe that this casting is not suitable bronze sword. Warring States bronze sword alloy tin content more than 16% or more, there is a certain amount of lead content in the casting process, the oxidation is fast.
Bronze sword body upright casting, was later bronze fluid into the chamber for rain like copper solution is easy to disconnect the phenomenon. The high-tin bronze liquid when pouring the event of a disconnected phenomenon, even if later incorporated, which will continue to exist a considerable number of oxides, namely, the oxidation of the so-called casting slag. Taotie is the most common and unique decoration of the bronze in Shang Dynasty. In general, the filling capacity of the Warring States bronze swords of this copper-tin alloy is much larger than the copper. The actual casting, the highest point of the outlet is higher than Fan cavity of the casting is pouring less than the phenomenon does not occur.
When the outlet is set in bronze sword above the vertical casting, bronze liquid from the outlet flow to the bronze sword between the need Shui two curved fluid into the chamber for copper, will inevitably produce a splash phenomenon everywhere. Splashing phenomenon, splashing the periphery of the copper droplets immediately oxidized and bound to produce a large number of bronze swords in the oxidation slag when this splash of copper droplets then fall to go to rendezvous with the copper solution to a hot pick and cold shuts and other casting defects. What on earth a taotie is engraved on a bronze.
In the casting of bronze swords in order to avoid the production of the casting defects, we adopted a "lie-flat vertical pouring shown in Figure 3, the outlet opened in the bronze hilt Ministry, casting, copper fluid directly through the outlet casting to copper bronze hilt, bronze hilt and bronze sword body parallel, into the chamber for liquid, will rise along a straight line parallel with the bronze sword grid to bronze sword Ngok, to avoid the copper liquid splashing phenomenon, naturally, to avoid the phenomenon of copper liquid disconnected, so that the oxidation rate caused by oxidation are relatively much lower. But one thing for sure is that chinese bronze is a frontal modeling animal mask.
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